Kill all python process before installing KA Lite

#define MyAppName "KA Lite"
#define MyAppPublisher "Foundation for Learning Equality"
#define MyAppURL "http://learningequality.org/"
#define MyAppExeName "KA Lite.exe"

#define getKALiteVersion() \
    Local[1] = GetEnv("KALITE_BUILD_VERSION")

#define TargetVersion = getKALiteVersion();

#expr DeleteFile(SourcePath+"\version.temp")

[Setup]
AppId={#MyAppName}-{#MyAppPublisher}
AppName={#MyAppName}
AppVersion={#TargetVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={pf}\{#MyAppName}
DefaultGroupName={#MyAppName}
LicenseFile=..\ka-lite\LICENSE
OutputDir=..\
OutputBaseFilename=KALiteSetup-{#TargetVersion}
SetupIconFile=logo48.ico
Compression=lzma
SolidCompression=yes
PrivilegesRequired=admin
UsePreviousAppDir=yes
ChangesEnvironment=yes

[Languages]
Name: "english"; MessagesFile: "compiler:Default.isl"

[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked

[Files]
Source: "..\ka_lite_static-*.whl"; DestDir: "{app}\ka-lite"
Source: "..\en.zip"; DestDir: "{app}"
Source: "..\scripts\*.bat"; DestDir: "{app}\ka-lite\scripts\"
Source: "..\gui-packed\KA Lite.exe"; DestDir: "{app}"; Flags: ignoreversion
Source: "..\gui-packed\guitools.vbs"; DestDir: "{app}"; Flags: ignoreversion
Source: "..\gui-packed\images\logo48.ico"; DestDir: "{app}\images"; Flags: ignoreversion
Source: "..\python-setup\*"; DestDir: "{app}\python-setup"; Flags: ignoreversion

[Icons]
Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; IconFilename: "{app}\images\logo48.ico"
Name: "{group}\{cm:ProgramOnTheWeb,{#MyAppName}}"; Filename: "{#MyAppURL}"
Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
Name: "{commondesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon ; IconFilename: "{app}\images\logo48.ico"

[Dirs]
Name: "{app}\"; Permissions: everyone-readexec

[InstallDelete]
Type: Files; Name: "{app}\*"

[UninstallDelete]
Type: filesandordirs; Name: "{app}\ka-lite*"
Type: files; Name: "{userstartup}\KA Lite.lnk"
Type: files; Name: "{app}\CONFIG.dat"

[UninstallRun]
Filename: {app}\ka-lite\scripts\uninstall-ka-lite-static.bat; Parameters: "";

[Code]
function GetPreviousVersion : String; Forward;

var
  installFlag : boolean;
  startupFlag : string;
  ServerInformationPage : TInputQueryWizardPage;
  StartupOptionsPage : TOutputMsgWizardPage;
  isUpgrade : boolean;
  stopServerCode: integer;
  removeOldGuiTool: integer;
  uninstallError: integer;
  saveDatabaseTemp : integer;
  cleanOldKaliteFolder : integer;
  restoreDatabaseTemp : integer;
  forceCancel : boolean;

procedure InitializeWizard;
begin
    isUpgrade := False;
    forceCancel := False;

    if WizardForm.PrevAppDir <> nil then
    begin
        ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        ShellExec('open', 'tskill.exe', '"KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C ka-lite\bin\windows\kalite.bat stop', WizardForm.PrevAppDir, SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C del winshortcut.vbs', WizardForm.PrevAppDir, SW_HIDE, ewWaitUntilTerminated, removeOldGuiTool);
    end;

    // Server data
    ServerInformationPage := CreateInputQueryPage(wpSelectDir,
    'Server Information', 'General data',
    'Please specify the server name and a description, then click Next. (you can leave blank both fields if you want to use the default server name or if you do not want to insert a description)');
    ServerInformationPage.Add('Server name:', False);
    ServerInformationPage.Add('Server description:', False);

    StartupOptionsPage := CreateOutputMsgPage(ServerInformationPage.ID,
        'Startup options', 'Please read the following important information.',
        'In prior versions of KA Lite you could choose to start the server or task-tray program automatically during installation.' #13#13
        'This is no longer possible during installation, but you can set these options using the task-tray program after installation finishes.' #13#13
        'To enable or disable these features, start the task-tray program and right click on it to find a list of options.'
    )
end;

procedure CancelButtonClick(CurPageID: Integer; var Cancel, Confirm: Boolean);
begin
  if forceCancel = True then
  begin
    Confirm := False;
  end;
end;

function ShouldSkipPage(PageID: Integer): Boolean;
begin
    result := False;
    if isUpgrade = True then
    begin
        if PageID = ServerInformationPage.ID then
        begin
            result := True;
        end;
        if PageID = wpSelectDir then
        begin
            result := True;
        end;
    end;
end;

procedure RemoveOldInstallation(targetPath : String);
begin
    WizardForm.Hide;
    if Not Exec(ExpandConstant('{cmd}'),'/C ( dir /b "unins***.exe" | findstr /r "unins[0-9][0-9][0-9].exe" ) > tempu & ( for /f "delims=" %A in ( tempu ) do call %A /SILENT /SUPPRESSMSGBOXES ) & del tempu', targetPath, SW_HIDE, ewWaitUntilTerminated, uninstallError) then
    begin
        Exec(ExpandConstant('{cmd}'),'/C mkdir '+ExpandConstant('{tmp}')+'\ka-lite\kalite\database & xcopy /y /s ka-lite\kalite\database\data.sqlite '+ExpandConstant('{tmp}')+'\ka-lite\kalite\database', targetPath, SW_HIDE, ewWaitUntilTerminated, saveDatabaseTemp);
        Exec(ExpandConstant('{cmd}'),'/C cd .. & del /q "'+targetPath+'\*" & for /d %x in ( "'+targetPath+'\*" ) do @rd /s /q "%x"', targetPath, SW_HIDE, ewWaitUntilTerminated, cleanOldKaliteFolder);
        Exec(ExpandConstant('{cmd}'),'/C mkdir ka-lite\kalite\database & xcopy /y /s '+ExpandConstant('{tmp}')+'\ka-lite\kalite\database\data.sqlite ka-lite\kalite\database', targetPath, SW_HIDE, ewWaitUntilTerminated, restoreDatabaseTemp);
    end;
    WizardForm.Show;
end;

{ Get the previous version number by checking the uninstall key registry values. }
{ IS writes quite a bit of information to the registry by default: https://github.com/jrsoftware/issrc/blob/5203240a7de9b83c5432bee0b5b09d467869a02b/Projects/Install.pas#L434 }
function GetPreviousVersion : String;
var
    subkey : String;
begin
    subkey := 'Software\Microsoft\Windows\CurrentVersion\Uninstall\KA Lite-Foundation for Learning Equality_is1';
    result := '';
    { 32-bit programs have a virtualized registry on 64-bit windows. So check all possible root keys. }
    if Not RegQueryStringValue(HKLM, subkey, 'DisplayVersion', result) then
    begin
        if Not RegQueryStringValue(HKCU, subkey, 'DisplayVersion', result) then
        begin
            if IsWin64 then
            begin
                if Not RegQueryStringValue(HKLM64, subkey, 'DisplayVersion', result) then
                begin
                    if Not RegQueryStringValue(HKCU64, subkey, 'DisplayVersion', result) then
                    begin
                        { Couldn't determine the previous version, so result is '' }
                    end;
                end;
            end;
        end;
    end;
end;

procedure ConfirmUpgradeDialog;
begin
    if MsgBox('We have detected an existing KA Lite installation; would you like to upgrade?', mbInformation,  MB_YESNO or MB_DEFBUTTON1) = IDYES then
    begin
        isUpgrade := True;
    end
    else if MsgBox('Installing fresh will delete all of your existing data; is this what you really want to do?', mbInformation,  MB_YESNO or MB_DEFBUTTON2) = IDYES then
    begin
        isUpgrade := False;
    end
    else
    begin
        isUpgrade := True;
    end;
end;

{ Copy files a la the gitmigrate management command, but use native windows executables instead. }
{ We assume the installing user is the main user of the app, so content goes into that user's .kalite dir}
procedure DoGitMigrate;
var
    retCodeContent, retCodeDB, retCode : integer;
begin
    MsgBox('Migrating old data to current user''s %USERPROFILE%\.kalite\ directory.', mbInformation, MB_OK);
    Exec(ExpandConstant('{cmd}'), '/S /C "mkdir "%USERPROFILE%\.kalite""', '', SW_SHOW, ewWaitUntilTerminated, retCode);
    Exec(ExpandConstant('{cmd}'), '/S /C "xcopy "' + WizardForm.PrevAppDir + '\ka-lite\content" "%USERPROFILE%\.kalite\content\" /Y"', '', SW_SHOW, ewWaitUntilTerminated, retCodeContent);
    Exec(ExpandConstant('{cmd}'), '/S /C "xcopy "' + WizardForm.PrevAppDir + '\ka-lite\kalite\database" "%USERPROFILE%\.kalite\database\" /Y"', '', SW_SHOW, ewWaitUntilTerminated, retCodeDB);
    if (retCodeContent <> 0) or (retCodeDB <> 0) then
    begin
        MsgBox('Something went wrong! Unable to backup your data. Continuing installation.', mbError, MB_OK);
    end;
end;

{ In version 0.13.x or below, users who selected the "Run KA Lite at system startup" option ran KA Lite as the }
{ SYSTEM user. Starting in 0.16.0, it will be run as the current user. Consequently, data must be migrated from the }
{ SYSTEM user's profile to the new location. }
procedure MoveSystemKaliteData;
var
    systemKaliteDir: String;
    userKaliteDir: String;
    userKaliteDirBackup: String;
    resultCode: Integer;
begin
    systemKaliteDir := 'C:\Windows\System32\config\systemprofile\.kalite';
    if DirExists(systemKaliteDir) then
    begin
        if(MsgBox('You may need to migrate data from the SYSTEM user''s profile to the current user''s profile.' #13#13
                  'This is because of a change in the behavior of KA Lite using the "Run KA Lite at system startup" option.' #13
                  'If you use this option, we recommend clicking yes. Your data will be backed up.' #13#13
                  'Would you like to migrate data from the SYSTEM user''s profile to the current user''s profile?', mbConfirmation, MB_YESNO) = idYes) then
        begin
            userKaliteDir := ExpandConstant('{%USERPROFILE}\.kalite');
            userKaliteDirBackup := userKaliteDir + '.backup';
            if DirExists(userKaliteDir) then
            begin
                MsgBox(userKaliteDir + ' already exists, backing up to ' + userKaliteDirBackup, mbInformation, MB_OK);
                if not Exec(ExpandConstant('{cmd}'), '/C "xcopy  "' + userKaliteDir +'" "' + userKaliteDirBackup +'\" /Y /S"', '', SW_SHOW, ewWaitUntilTerminated, resultCode) then
                begin
                    MsgBox('Backup .kalite file copy fail.', mbInformation, MB_OK);
                end;
            end;
            if not Exec(ExpandConstant('{cmd}'), '/C "xcopy  "' + systemKaliteDir +'" "' + userKaliteDir +'\" /Y /S"', '', SW_SHOW, ewWaitUntilTerminated, resultCode) then
            begin
                MsgBox('System .kalite file copy fail.', mbInformation, MB_OK);
            end;
        end;
    end;
end;

{ Used in GetPipPath below }
const
    DEFAULT_PIP_PATH = '\Python27\Scripts\pip.exe';
    DEFAULT_PYTHON_PATH = '\Python27\python.exe';

{ Returns the path of pip.exe on the system. }
{ Tries several different locations before prompting user. }
function GetPipPath: string;
var
    kalitePythonEnv: string;
    path : string;
    i : integer;
begin
    kalitePythonEnv := GetEnv('KALITE_PYTHON');
    Log(kalitePythonEnv)
    if kalitePythonEnv = '' then
      begin
        path := DEFAULT_PIP_PATH;
        if FileExists(path) then
        begin
            Result := path;
            exit;
        end
      end
    else
      begin
        if FileExists(kalitePythonEnv) then
            Result := ExtractFileDir(kalitePythonEnv) + '\Scripts\pip.exe';
            exit;
      end

    MsgBox('Could not find pip.exe. Please select the location of pip.exe to continue installation.', mbInformation, MB_OK);
    if GetOpenFileName('Please select pip.exe', path, '', 'All files (*.*)|*.*', 'exe') then
    begin
        Result := path;
    end
    else begin
        MsgBox('Fatal error'#13#13'Please install pip and try again.', mbError, MB_OK);
        forceCancel := True;
        Result := '';
    end;
end;

procedure HandlePipSetup;
var
    PipCommand: string;
    PipPath: string;
    pythonPath: string;
    checkEnc: string;
    ErrorCode: integer;

begin
    PipPath := GetPipPath;
    if PipPath = '' then
        exit;
    PipCommand := 'install "' + ExpandConstant('{app}') + '\ka-lite\ka_lite_static-' + '{#TargetVersion}' + '-py2-none-any' + '.whl"';

    MsgBox('Setup will now install kalite source files to your Python site-packages.', mbInformation, MB_OK);
    if not Exec(PipPath, PipCommand, '', SW_SHOW, ewWaitUntilTerminated, ErrorCode) then
    begin
      MsgBox('Critical error.' #13#13 'Dependencies have failed to install. Error Number: ' + IntToStr(ErrorCode), mbInformation, MB_OK);
      forceCancel := True;
      WizardForm.Close;
    end

    { Must set this environment variable so the systray executable knows where to find the installed kalite.bat script}
    { Should by in the same directory as pip.exe, e.g. 'C:\Python27\Scripts' }
    RegWriteStringValue(
        HKLM,
        'System\CurrentControlSet\Control\Session Manager\Environment',
        'KALITE_SCRIPT_DIR',
        ExtractFileDir(PipPath)
    );
    pythonPath := ExtractFileDir(ExtractFileDir(PipPath)) + '\python.exe';
    FileCopy(ExpandConstant('{app}') + '\ka-lite\scripts\kalite.bat', ExtractFileDir(PipPath) + '\kalite.bat', False);
    RegWriteStringValue(
        HKLM,
        'System\CurrentControlSet\Control\Session Manager\Environment',
        'KALITE_PYTHON',
        pythonPath
    );
end;

procedure HandleUpgrade(targetPath : String);
var
    prevVerStr : String;
    retCode: Integer;
    pipPath: string;
begin
    prevVerStr := GetPreviousVersion();
    pipPath := GetPipPath;
    Exec(ExpandConstant('{cmd}'),'/C ' + ExtractFileDir(pipPath) +'\kalite.bat stop', WizardForm.PrevAppDir, SW_HIDE, ewWaitUntilTerminated, stopServerCode);
    if (CompareStr('{#TargetVersion}', prevVerStr) >= 0) and not (prevVerStr = '') then
    begin
        ConfirmUpgradeDialog;
        if Not isUpgrade then
        begin
            if Not DeleteFile(targetPath + '\ka-lite\kalite\database\data.sqlite') then
            begin
                MsgBox('Error' #13#13 'Failed to delete the old database as requested; aborting the install.', mbError, MB_OK);
                forceCancel := True;
                WizardForm.Close;
            end;
        end
        else
        begin
            { This is where version-specific migration stuff should happen. }

            if CompareStr(prevVerStr, '0.13.99') < 0 then
            begin
                if CompareStr('{#TargetVersion}', '0.14.0') >= 0 then
                begin
                    DoGitMigrate;
                end;
            end;

            { A special case where we'd like to remove a scheduled task, since it should now be run as current user }
            { instead of the SYSTEM user. }
            if CompareStr(prevVerStr, '0.15.99') < 0 then
            begin
                if CompareStr('{#TargetVersion}', '0.16.0') >= 0 then
                begin
                    Exec(ExpandConstant('{cmd}'),'/C "schtasks /delete /tn "KALite" /f"', '', SW_SHOW, ewWaitUntilTerminated, retCode);
                end;
            end;

            { Migrating from 0.14.x and 0.15.x to 0.16.x }
            if (CompareStr(prevVerStr, '0.14.0') >= 0) and (CompareStr(prevVerStr, '0.15.99') < 0) then
            begin
                if CompareStr('{#TargetVersion}', '0.16.0') >= 0 then
                begin
                    MoveSystemKaliteData;
                end;
            end;
        end;

        { forceCancel will be true if something went awry in DoGitMigrate... abort instead of trampling the user's data. }
        if Not forceCancel then
        begin
            RemoveOldInstallation(targetPath);
        end;
    end;
end;

function NextButtonClick(CurPageID: Integer): Boolean;
begin
    result := True;

    if CurPageID = wpLicense then
    begin
        if WizardForm.PrevAppDir <> nil then
            HandleUpgrade(WizardForm.PrevAppDir);
    end;

    if CurPageID = wpSelectDir then
    begin
        { Unclear what the logic here is. This is only executed if HandleUpgrade was not previously run. }
        if Not isUpgrade then
            HandleUpgrade(ExpandConstant('{app}'));
    end;
end;

{REF: http://stackoverflow.com/questions/4438506/exit-from-inno-setup-instalation-from-code}
procedure ExitProcess(uExitCode: Integer);
  external 'ExitProcess@kernel32.dll stdcall';

procedure HandlePythonSetup;
var
    installPythonErrorCode : Integer;
begin
    if(MsgBox('KA Lite requires Python to be installed on your system.' + #13#10 + 'This wizard will proceed to install Python 2.7.12, and then continue with  KA Lite installation.' + #13#10 + #13#10 + 'Click OK to continue.', mbConfirmation, MB_OKCANCEL) = idCancel) then
        if(MsgBox('Are you sure you want to cancel the installation of Python 2.7.12?' + #13#10 + 'If you select Yes, this installer will close and KA Lite will not be installed on your system.', mbConfirmation, MB_YESNO) = idYes) then
          begin
            forceCancel := True;
            ExitProcess(1);
          end
        else begin
             HandlePythonSetup();
             exit;
        end
    else
        ExtractTemporaryFile('python-2.7.12.msi');
        ExtractTemporaryFile('python-2.7.12.amd64.msi');
        ExtractTemporaryFile('python-exe.bat');
        ShellExec('open', ExpandConstant('{tmp}')+'\python-exe.bat', '', '', SW_HIDE, ewWaitUntilTerminated, installPythonErrorCode);

end;

function InitializeSetup(): Boolean;
var
  PythonVersionCodeCheck: integer;
  killErrorCode: integer;
begin
    installFlag:=true;
    Result := true;
    startupFlag:='';

    ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, killErrorCode)
    ShellExec('open', 'tskill.exe', ' "KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, killErrorCode);
    RegDeleteValue(HKCU, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Run', ExpandConstant('{#MyAppName}'));
    if(MsgBox('Warning! All python process will be closed in order to install KA Lite.' + #13#10 + #13#10 + 'Click OK to continue.', mbConfirmation, MB_OKCANCEL) = idCancel) then
    begin
        if(MsgBox('Are you sure you want to cancel the installation of KA Lite?' + #13#10 + 'If you select Yes, this installer will close and KA Lite will not be installed on your system.', mbConfirmation, MB_YESNO) = idYes) then
          begin
            forceCancel := True;
            ExitProcess(1);
          end
          else begin
            InitializeSetup()
          end
    end
    Exec(ExpandConstant('taskkill.exe'), '/f /im ' + '"python.exe"', '', SW_HIDE, ewWaitUntilTerminated, killErrorCode);
    if ShellExec('open', 'python.exe','-c "import sys; (sys.version_info >= (2, 7, 11,) and sys.version_info < (3,) and sys.exit(0)) or sys.exit(1)"', '', SW_HIDE, ewWaitUntilTerminated, PythonVersionCodeCheck) then
    begin
        if PythonVersionCodeCheck = 1 then
        begin
            HandlePythonSetup();
        end;
    end
    else
    begin
        HandlePythonSetup();
    end;
end;

function InitializeUninstall(): Boolean;
var
ErrorCode: Integer;
begin
  ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, ErrorCode);
  ShellExec('open', 'tskill.exe', '"KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, ErrorCode);
  ShellExec('open', ExpandConstant('{app}') + '\ka-lite\bin\windows\kalite.bat stop', '', '', SW_HIDE, ewWaitUntilTerminated, ErrorCode);
  result := True;
end;

procedure DoSetup;
var
    retCode: integer;
begin
    { Used to have more responsibility, but we delegated those to the app itself! }
    { Unpacks the English content pack. }
    Exec(ExpandConstant('{cmd}'), '/S /C "' + ExpandConstant('"{reg:HKLM\System\CurrentControlSet\Control\Session Manager\Environment,KALITE_SCRIPT_DIR}\kalite.bat"') + ' manage syncdb --noinput"', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, retCode);
    Exec(ExpandConstant('{cmd}'), '/S /C "' + ExpandConstant('"{reg:HKLM\System\CurrentControlSet\Control\Session Manager\Environment,KALITE_SCRIPT_DIR}\kalite.bat"') + ' manage retrievecontentpack local en en.zip --foreground"', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, retCode);
end;

procedure CurStepChanged(CurStep: TSetupStep);
var
  moveKaliteFolderTemp: integer;
  moveContentFolderTemp: integer;
  cleanKaliteFolder: integer;
  restoreKaliteFolder: integer;
  restoreContentFolder: integer;
  informationBoxFlagged: boolean;

begin
    if CurStep = ssInstall then
    begin
        informationBoxFlagged :=False;

        ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        ShellExec('open', 'tskill.exe', '"KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C ka-lite\bin\windows\kalite.bat stop', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C del winshortcut.vbs', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, removeOldGuiTool);

        if DirExists(ExpandConstant('{app}') + '\kalite') then
        begin
            MsgBox('KA Lite old data structure' #13#13 'Setup detected that you have the old file structure. Setup will now move data to update the structure. Please be patient; this may take some time.', mbInformation, MB_OK);
            informationBoxFlagged :=True;
            Exec(ExpandConstant('{cmd}'),'/C mkdir '+ExpandConstant('{tmp}')+'\ka-lite\kalite & xcopy /y /s kalite\* '+ExpandConstant('{tmp}')+'\ka-lite\kalite', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, moveKaliteFolderTemp);
        end;

        if DirExists(ExpandConstant('{app}') + '\content') then
        begin
            if Not informationBoxFlagged then
            begin
                MsgBox('KA Lite old data structure' #13#13 'Setup detected that you have the old file structure. Setup will now move data to update the structure. Please be patient; this may take some time.', mbInformation, MB_OK);
                informationBoxFlagged :=True;
            end;
            Exec(ExpandConstant('{cmd}'),'/C mkdir '+ExpandConstant('{tmp}')+'\ka-lite\content & xcopy /y /s content\* '+ExpandConstant('{tmp}')+'\ka-lite\content', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, moveContentFolderTemp);
        end;

        if informationBoxFlagged then
        begin
            Exec(ExpandConstant('{cmd}'),'/C cd .. & del /q "'+ExpandConstant('{app}')+'\*" & for /d %x in ( "'+ExpandConstant('{app}')+'\*" ) do @rd /s /q "%x"', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, cleanKaliteFolder);

            if DirExists(ExpandConstant('{tmp}')+'\ka-lite\kalite') then
            begin
                Exec(ExpandConstant('{cmd}'),'/C mkdir ka-lite\kalite & xcopy /y /s '+ExpandConstant('{tmp}')+'\ka-lite\kalite\* ka-lite\kalite', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, restoreKaliteFolder);
            end;

            if DirExists(ExpandConstant('{tmp}')+'\ka-lite\content') then
            begin
                Exec(ExpandConstant('{cmd}'),'/C mkdir ka-lite\content & xcopy /y /s '+ExpandConstant('{tmp}')+'\ka-lite\content\* ka-lite\content', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, restoreContentFolder);
            end;
        end;

    end;

    if CurStep = ssPostInstall then
    begin
        if installFlag then
        begin
            HandlePipSetup();
            begin
                DoSetup;
            end;
        end;
    end;
end;

{ Called just prior to uninstall finishing. }
{ Clean up things we did during uninstall: }
{ * Remove environment variable KALITE_SCRIPT_DIR, which is set starting in version 0.16.x }
{ * Previously (versions 0.13.x to 0.15.x) KALITE_ROOT_DATA_PATH was set -- it should be unset by the respective }
{   uninstallers of those versions }
procedure DeinitializeUninstall();
begin
    RegDeleteValue(
        HKLM,
        'System\CurrentControlSet\Control\Session Manager\Environment',
        'KALITE_SCRIPT_DIR'
    )
end;

#define MyAppName "KA Lite"
#define MyAppPublisher "Foundation for Learning Equality"
#define MyAppURL "http://learningequality.org/"
#define MyAppExeName "KA Lite.exe"

#define getKALiteVersion() \
    Local[1] = GetEnv("KALITE_BUILD_VERSION")

#define TargetVersion = getKALiteVersion();

#expr DeleteFile(SourcePath+"\version.temp")

[Setup]
AppId={#MyAppName}-{#MyAppPublisher}
AppName={#MyAppName}
AppVersion={#TargetVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={pf}\{#MyAppName}
DefaultGroupName={#MyAppName}
LicenseFile=..\ka-lite\LICENSE
OutputDir=..\
OutputBaseFilename=KALiteSetup-{#TargetVersion}
SetupIconFile=logo48.ico
Compression=lzma
SolidCompression=yes
PrivilegesRequired=admin
UsePreviousAppDir=yes
ChangesEnvironment=yes

[Languages]
Name: "english"; MessagesFile: "compiler:Default.isl"

[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked

[Files]
Source: "..\ka_lite_static-*.whl"; DestDir: "{app}\ka-lite"
Source: "..\en.zip"; DestDir: "{app}"
Source: "..\scripts\*.bat"; DestDir: "{app}\ka-lite\scripts\"
Source: "..\gui-packed\KA Lite.exe"; DestDir: "{app}"; Flags: ignoreversion
Source: "..\gui-packed\guitools.vbs"; DestDir: "{app}"; Flags: ignoreversion
Source: "..\gui-packed\images\logo48.ico"; DestDir: "{app}\images"; Flags: ignoreversion
Source: "..\python-setup\*"; DestDir: "{app}\python-setup"; Flags: ignoreversion

[Icons]
Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; IconFilename: "{app}\images\logo48.ico"
Name: "{group}\{cm:ProgramOnTheWeb,{#MyAppName}}"; Filename: "{#MyAppURL}"
Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
Name: "{commondesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon ; IconFilename: "{app}\images\logo48.ico"

[Dirs]
Name: "{app}\"; Permissions: everyone-readexec

[InstallDelete]
Type: Files; Name: "{app}\*"

[UninstallDelete]
Type: filesandordirs; Name: "{app}\ka-lite*"
Type: files; Name: "{userstartup}\KA Lite.lnk"
Type: files; Name: "{app}\CONFIG.dat"

[UninstallRun]
Filename: {app}\ka-lite\scripts\uninstall-ka-lite-static.bat; Parameters: "";

[Code]
function GetPreviousVersion : String; Forward;

var
  installFlag : boolean;
  startupFlag : string;
  ServerInformationPage : TInputQueryWizardPage;
  StartupOptionsPage : TOutputMsgWizardPage;
  isUpgrade : boolean;
  stopServerCode: integer;
  removeOldGuiTool: integer;
  uninstallError: integer;
  saveDatabaseTemp : integer;
  cleanOldKaliteFolder : integer;
  restoreDatabaseTemp : integer;
  forceCancel : boolean;

procedure InitializeWizard;
begin
    isUpgrade := False;
    forceCancel := False;

    if WizardForm.PrevAppDir <> nil then
    begin
        ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        ShellExec('open', 'tskill.exe', '"KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C ka-lite\bin\windows\kalite.bat stop', WizardForm.PrevAppDir, SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C del winshortcut.vbs', WizardForm.PrevAppDir, SW_HIDE, ewWaitUntilTerminated, removeOldGuiTool);
    end;

    // Server data
    ServerInformationPage := CreateInputQueryPage(wpSelectDir,
    'Server Information', 'General data',
    'Please specify the server name and a description, then click Next. (you can leave blank both fields if you want to use the default server name or if you do not want to insert a description)');
    ServerInformationPage.Add('Server name:', False);
    ServerInformationPage.Add('Server description:', False);

    StartupOptionsPage := CreateOutputMsgPage(ServerInformationPage.ID,
        'Startup options', 'Please read the following important information.',
        'In prior versions of KA Lite you could choose to start the server or task-tray program automatically during installation.' #13#13
        'This is no longer possible during installation, but you can set these options using the task-tray program after installation finishes.' #13#13
        'To enable or disable these features, start the task-tray program and right click on it to find a list of options.'
    )
end;

procedure CancelButtonClick(CurPageID: Integer; var Cancel, Confirm: Boolean);
begin
  if forceCancel = True then
  begin
    Confirm := False;
  end;
end;

function ShouldSkipPage(PageID: Integer): Boolean;
begin
    result := False;
    if isUpgrade = True then
    begin
        if PageID = ServerInformationPage.ID then
        begin
            result := True;
        end;
        if PageID = wpSelectDir then
        begin
            result := True;
        end;
    end;
end;

procedure RemoveOldInstallation(targetPath : String);
begin
    WizardForm.Hide;
    if Not Exec(ExpandConstant('{cmd}'),'/C ( dir /b "unins***.exe" | findstr /r "unins[0-9][0-9][0-9].exe" ) > tempu & ( for /f "delims=" %A in ( tempu ) do call %A /SILENT /SUPPRESSMSGBOXES ) & del tempu', targetPath, SW_HIDE, ewWaitUntilTerminated, uninstallError) then
    begin
        Exec(ExpandConstant('{cmd}'),'/C mkdir '+ExpandConstant('{tmp}')+'\ka-lite\kalite\database & xcopy /y /s ka-lite\kalite\database\data.sqlite '+ExpandConstant('{tmp}')+'\ka-lite\kalite\database', targetPath, SW_HIDE, ewWaitUntilTerminated, saveDatabaseTemp);
        Exec(ExpandConstant('{cmd}'),'/C cd .. & del /q "'+targetPath+'\*" & for /d %x in ( "'+targetPath+'\*" ) do @rd /s /q "%x"', targetPath, SW_HIDE, ewWaitUntilTerminated, cleanOldKaliteFolder);
        Exec(ExpandConstant('{cmd}'),'/C mkdir ka-lite\kalite\database & xcopy /y /s '+ExpandConstant('{tmp}')+'\ka-lite\kalite\database\data.sqlite ka-lite\kalite\database', targetPath, SW_HIDE, ewWaitUntilTerminated, restoreDatabaseTemp);
    end;
    WizardForm.Show;
end;

{ Get the previous version number by checking the uninstall key registry values. }
{ IS writes quite a bit of information to the registry by default: https://github.com/jrsoftware/issrc/blob/5203240a7de9b83c5432bee0b5b09d467869a02b/Projects/Install.pas#L434 }
function GetPreviousVersion : String;
var
    subkey : String;
begin
    subkey := 'Software\Microsoft\Windows\CurrentVersion\Uninstall\KA Lite-Foundation for Learning Equality_is1';
    result := '';
    { 32-bit programs have a virtualized registry on 64-bit windows. So check all possible root keys. }
    if Not RegQueryStringValue(HKLM, subkey, 'DisplayVersion', result) then
    begin
        if Not RegQueryStringValue(HKCU, subkey, 'DisplayVersion', result) then
        begin
            if IsWin64 then
            begin
                if Not RegQueryStringValue(HKLM64, subkey, 'DisplayVersion', result) then
                begin
                    if Not RegQueryStringValue(HKCU64, subkey, 'DisplayVersion', result) then
                    begin
                        { Couldn't determine the previous version, so result is '' }
                    end;
                end;
            end;
        end;
    end;
end;

procedure ConfirmUpgradeDialog;
begin
    if MsgBox('We have detected an existing KA Lite installation; would you like to upgrade?', mbInformation,  MB_YESNO or MB_DEFBUTTON1) = IDYES then
    begin
        isUpgrade := True;
    end
    else if MsgBox('Installing fresh will delete all of your existing data; is this what you really want to do?', mbInformation,  MB_YESNO or MB_DEFBUTTON2) = IDYES then
    begin
        isUpgrade := False;
    end
    else
    begin
        isUpgrade := True;
    end;
end;

{ Copy files a la the gitmigrate management command, but use native windows executables instead. }
{ We assume the installing user is the main user of the app, so content goes into that user's .kalite dir}
procedure DoGitMigrate;
var
    retCodeContent, retCodeDB, retCode : integer;
begin
    MsgBox('Migrating old data to current user''s %USERPROFILE%\.kalite\ directory.', mbInformation, MB_OK);
    Exec(ExpandConstant('{cmd}'), '/S /C "mkdir "%USERPROFILE%\.kalite""', '', SW_SHOW, ewWaitUntilTerminated, retCode);
    Exec(ExpandConstant('{cmd}'), '/S /C "xcopy "' + WizardForm.PrevAppDir + '\ka-lite\content" "%USERPROFILE%\.kalite\content\" /Y"', '', SW_SHOW, ewWaitUntilTerminated, retCodeContent);
    Exec(ExpandConstant('{cmd}'), '/S /C "xcopy "' + WizardForm.PrevAppDir + '\ka-lite\kalite\database" "%USERPROFILE%\.kalite\database\" /Y"', '', SW_SHOW, ewWaitUntilTerminated, retCodeDB);
    if (retCodeContent <> 0) or (retCodeDB <> 0) then
    begin
        MsgBox('Something went wrong! Unable to backup your data. Continuing installation.', mbError, MB_OK);
    end;
end;

{ In version 0.13.x or below, users who selected the "Run KA Lite at system startup" option ran KA Lite as the }
{ SYSTEM user. Starting in 0.16.0, it will be run as the current user. Consequently, data must be migrated from the }
{ SYSTEM user's profile to the new location. }
procedure MoveSystemKaliteData;
var
    systemKaliteDir: String;
    userKaliteDir: String;
    userKaliteDirBackup: String;
    resultCode: Integer;
begin
    systemKaliteDir := 'C:\Windows\System32\config\systemprofile\.kalite';
    if DirExists(systemKaliteDir) then
    begin
        if(MsgBox('You may need to migrate data from the SYSTEM user''s profile to the current user''s profile.' #13#13
                  'This is because of a change in the behavior of KA Lite using the "Run KA Lite at system startup" option.' #13
                  'If you use this option, we recommend clicking yes. Your data will be backed up.' #13#13
                  'Would you like to migrate data from the SYSTEM user''s profile to the current user''s profile?', mbConfirmation, MB_YESNO) = idYes) then
        begin
            userKaliteDir := ExpandConstant('{%USERPROFILE}\.kalite');
            userKaliteDirBackup := userKaliteDir + '.backup';
            if DirExists(userKaliteDir) then
            begin
                MsgBox(userKaliteDir + ' already exists, backing up to ' + userKaliteDirBackup, mbInformation, MB_OK);
                if not Exec(ExpandConstant('{cmd}'), '/C "xcopy  "' + userKaliteDir +'" "' + userKaliteDirBackup +'\" /Y /S"', '', SW_SHOW, ewWaitUntilTerminated, resultCode) then
                begin
                    MsgBox('Backup .kalite file copy fail.', mbInformation, MB_OK);
                end;
            end;
            if not Exec(ExpandConstant('{cmd}'), '/C "xcopy  "' + systemKaliteDir +'" "' + userKaliteDir +'\" /Y /S"', '', SW_SHOW, ewWaitUntilTerminated, resultCode) then
            begin
                MsgBox('System .kalite file copy fail.', mbInformation, MB_OK);
            end;
        end;
    end;
end;

{ Used in GetPipPath below }
const
    DEFAULT_PIP_PATH = '\Python27\Scripts\pip.exe';
    DEFAULT_PYTHON_PATH = '\Python27\python.exe';

{ Returns the path of pip.exe on the system. }
{ Tries several different locations before prompting user. }
function GetPipPath: string;
var
    kalitePythonEnv: string;
    path : string;
    i : integer;
begin
    kalitePythonEnv := GetEnv('KALITE_PYTHON');
    Log(kalitePythonEnv)
    if kalitePythonEnv = '' then
      begin
        path := DEFAULT_PIP_PATH;
        if FileExists(path) then
        begin
            Result := path;
            exit;
        end
      end
    else
      begin
        if FileExists(kalitePythonEnv) then
            Result := ExtractFileDir(kalitePythonEnv) + '\Scripts\pip.exe';
            exit;
      end

    MsgBox('Could not find pip.exe. Please select the location of pip.exe to continue installation.', mbInformation, MB_OK);
    if GetOpenFileName('Please select pip.exe', path, '', 'All files (*.*)|*.*', 'exe') then
    begin
        Result := path;
    end
    else begin
        MsgBox('Fatal error'#13#13'Please install pip and try again.', mbError, MB_OK);
        forceCancel := True;
        Result := '';
    end;
end;

procedure HandlePipSetup;
var
    PipCommand: string;
    PipPath: string;
    pythonPath: string;
    checkEnc: string;
    ErrorCode: integer;

begin
    PipPath := GetPipPath;
    if PipPath = '' then
        exit;
    PipCommand := 'install "' + ExpandConstant('{app}') + '\ka-lite\ka_lite_static-' + '{#TargetVersion}' + '-py2-none-any' + '.whl"';

    MsgBox('Setup will now install kalite source files to your Python site-packages.', mbInformation, MB_OK);
    if not Exec(PipPath, PipCommand, '', SW_SHOW, ewWaitUntilTerminated, ErrorCode) then
    begin
      MsgBox('Critical error.' #13#13 'Dependencies have failed to install. Error Number: ' + IntToStr(ErrorCode), mbInformation, MB_OK);
      forceCancel := True;
      WizardForm.Close;
    end

    { Must set this environment variable so the systray executable knows where to find the installed kalite.bat script}
    { Should by in the same directory as pip.exe, e.g. 'C:\Python27\Scripts' }
    RegWriteStringValue(
        HKLM,
        'System\CurrentControlSet\Control\Session Manager\Environment',
        'KALITE_SCRIPT_DIR',
        ExtractFileDir(PipPath)
    );
    pythonPath := ExtractFileDir(ExtractFileDir(PipPath)) + '\python.exe';
    FileCopy(ExpandConstant('{app}') + '\ka-lite\scripts\kalite.bat', ExtractFileDir(PipPath) + '\kalite.bat', False);
    RegWriteStringValue(
        HKLM,
        'System\CurrentControlSet\Control\Session Manager\Environment',
        'KALITE_PYTHON',
        pythonPath
    );
end;

procedure HandleUpgrade(targetPath : String);
var
    prevVerStr : String;
    retCode: Integer;
    pipPath: string;
begin
    prevVerStr := GetPreviousVersion();
    pipPath := GetPipPath;
    Exec(ExpandConstant('{cmd}'),'/C ' + ExtractFileDir(pipPath) +'\kalite.bat stop', WizardForm.PrevAppDir, SW_HIDE, ewWaitUntilTerminated, stopServerCode);
    if (CompareStr('{#TargetVersion}', prevVerStr) >= 0) and not (prevVerStr = '') then
    begin
        ConfirmUpgradeDialog;
        if Not isUpgrade then
        begin
            if Not DeleteFile(targetPath + '\ka-lite\kalite\database\data.sqlite') then
            begin
                MsgBox('Error' #13#13 'Failed to delete the old database as requested; aborting the install.', mbError, MB_OK);
                forceCancel := True;
                WizardForm.Close;
            end;
        end
        else
        begin
            { This is where version-specific migration stuff should happen. }

            if CompareStr(prevVerStr, '0.13.99') < 0 then
            begin
                if CompareStr('{#TargetVersion}', '0.14.0') >= 0 then
                begin
                    DoGitMigrate;
                end;
            end;

            { A special case where we'd like to remove a scheduled task, since it should now be run as current user }
            { instead of the SYSTEM user. }
            if CompareStr(prevVerStr, '0.15.99') < 0 then
            begin
                if CompareStr('{#TargetVersion}', '0.16.0') >= 0 then
                begin
                    Exec(ExpandConstant('{cmd}'),'/C "schtasks /delete /tn "KALite" /f"', '', SW_SHOW, ewWaitUntilTerminated, retCode);
                end;
            end;

            { Migrating from 0.14.x and 0.15.x to 0.16.x }
            if (CompareStr(prevVerStr, '0.14.0') >= 0) and (CompareStr(prevVerStr, '0.15.99') < 0) then
            begin
                if CompareStr('{#TargetVersion}', '0.16.0') >= 0 then
                begin
                    MoveSystemKaliteData;
                end;
            end;
        end;

        { forceCancel will be true if something went awry in DoGitMigrate... abort instead of trampling the user's data. }
        if Not forceCancel then
        begin
            RemoveOldInstallation(targetPath);
        end;
    end;
end;

function NextButtonClick(CurPageID: Integer): Boolean;
begin
    result := True;

    if CurPageID = wpLicense then
    begin
        if WizardForm.PrevAppDir <> nil then
            HandleUpgrade(WizardForm.PrevAppDir);
    end;

    if CurPageID = wpSelectDir then
    begin
        { Unclear what the logic here is. This is only executed if HandleUpgrade was not previously run. }
        if Not isUpgrade then
            HandleUpgrade(ExpandConstant('{app}'));
    end;
end;

{REF: http://stackoverflow.com/questions/4438506/exit-from-inno-setup-instalation-from-code}
procedure ExitProcess(uExitCode: Integer);
  external 'ExitProcess@kernel32.dll stdcall';

procedure HandlePythonSetup;
var
    installPythonErrorCode : Integer;
begin
    if(MsgBox('KA Lite requires Python to be installed on your system.' + #13#10 + 'This wizard will proceed to install Python 2.7.12, and then continue with  KA Lite installation.' + #13#10 + #13#10 + 'Click OK to continue.', mbConfirmation, MB_OKCANCEL) = idCancel) then
        if(MsgBox('Are you sure you want to cancel the installation of Python 2.7.12?' + #13#10 + 'If you select Yes, this installer will close and KA Lite will not be installed on your system.', mbConfirmation, MB_YESNO) = idYes) then
          begin
            forceCancel := True;
            ExitProcess(1);
          end
        else begin
             HandlePythonSetup();
             exit;
        end
    else
      if(MsgBox('Warning! All python process will be closed in order to upgrade your Python.' + #13#10 + #13#10 + 'Click OK to continue.', mbConfirmation, MB_OKCANCEL) = idCancel) then
          begin
          HandlePythonSetup();
          exit;
          end
      else begin
          Exec(ExpandConstant('taskkill.exe'), '/f /im ' + '"python.exe"', '', SW_HIDE, ewWaitUntilTerminated, installPythonErrorCode);
          ExtractTemporaryFile('python-2.7.12.msi');
          ExtractTemporaryFile('python-2.7.12.amd64.msi');
          ExtractTemporaryFile('python-exe.bat');
          ShellExec('open', ExpandConstant('{tmp}')+'\python-exe.bat', '', '', SW_HIDE, ewWaitUntilTerminated, installPythonErrorCode);

      end
end;

function InitializeSetup(): Boolean;
var
  PythonVersionCodeCheck: integer;
  killErrorCode: integer;
begin
    installFlag:=true;
    Result := true;
    startupFlag:='';

    ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, killErrorCode)
    ShellExec('open', 'tskill.exe', ' "KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, killErrorCode);

    RegDeleteValue(HKCU, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Run', ExpandConstant('{#MyAppName}'));

    if ShellExec('open', 'python.exe','-c "import sys; (sys.version_info >= (2, 7, 11,) and sys.version_info < (3,) and sys.exit(0)) or sys.exit(1)"', '', SW_HIDE, ewWaitUntilTerminated, PythonVersionCodeCheck) then
    begin
        if PythonVersionCodeCheck = 1 then
        begin
            HandlePythonSetup();
        end;
    end
    else
    begin
        HandlePythonSetup();
    end;
end;

function InitializeUninstall(): Boolean;
var
ErrorCode: Integer;
begin
  ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, ErrorCode);
  ShellExec('open', 'tskill.exe', '"KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, ErrorCode);
  ShellExec('open', ExpandConstant('{app}') + '\ka-lite\bin\windows\kalite.bat stop', '', '', SW_HIDE, ewWaitUntilTerminated, ErrorCode);
  result := True;
end;

procedure DoSetup;
var
    retCode: integer;
begin
    { Used to have more responsibility, but we delegated those to the app itself! }
    { Unpacks the English content pack. }
    Exec(ExpandConstant('{cmd}'), '/S /C "' + ExpandConstant('"{reg:HKLM\System\CurrentControlSet\Control\Session Manager\Environment,KALITE_SCRIPT_DIR}\kalite.bat"') + ' manage syncdb --noinput"', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, retCode);
    Exec(ExpandConstant('{cmd}'), '/S /C "' + ExpandConstant('"{reg:HKLM\System\CurrentControlSet\Control\Session Manager\Environment,KALITE_SCRIPT_DIR}\kalite.bat"') + ' manage retrievecontentpack local en en.zip --foreground"', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, retCode);
end;

procedure CurStepChanged(CurStep: TSetupStep);
var
  moveKaliteFolderTemp: integer;
  moveContentFolderTemp: integer;
  cleanKaliteFolder: integer;
  restoreKaliteFolder: integer;
  restoreContentFolder: integer;
  informationBoxFlagged: boolean;

begin
    if CurStep = ssInstall then
    begin
        informationBoxFlagged :=False;

        ShellExec('open', 'taskkill.exe', '/F /T /im "KA Lite.exe"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        ShellExec('open', 'tskill.exe', '"KA Lite"', '', SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C ka-lite\bin\windows\kalite.bat stop', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, stopServerCode);
        Exec(ExpandConstant('{cmd}'),'/C del winshortcut.vbs', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, removeOldGuiTool);

        if DirExists(ExpandConstant('{app}') + '\kalite') then
        begin
            MsgBox('KA Lite old data structure' #13#13 'Setup detected that you have the old file structure. Setup will now move data to update the structure. Please be patient; this may take some time.', mbInformation, MB_OK);
            informationBoxFlagged :=True;
            Exec(ExpandConstant('{cmd}'),'/C mkdir '+ExpandConstant('{tmp}')+'\ka-lite\kalite & xcopy /y /s kalite\* '+ExpandConstant('{tmp}')+'\ka-lite\kalite', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, moveKaliteFolderTemp);
        end;

        if DirExists(ExpandConstant('{app}') + '\content') then
        begin
            if Not informationBoxFlagged then
            begin
                MsgBox('KA Lite old data structure' #13#13 'Setup detected that you have the old file structure. Setup will now move data to update the structure. Please be patient; this may take some time.', mbInformation, MB_OK);
                informationBoxFlagged :=True;
            end;
            Exec(ExpandConstant('{cmd}'),'/C mkdir '+ExpandConstant('{tmp}')+'\ka-lite\content & xcopy /y /s content\* '+ExpandConstant('{tmp}')+'\ka-lite\content', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, moveContentFolderTemp);
        end;

        if informationBoxFlagged then
        begin
            Exec(ExpandConstant('{cmd}'),'/C cd .. & del /q "'+ExpandConstant('{app}')+'\*" & for /d %x in ( "'+ExpandConstant('{app}')+'\*" ) do @rd /s /q "%x"', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, cleanKaliteFolder);

            if DirExists(ExpandConstant('{tmp}')+'\ka-lite\kalite') then
            begin
                Exec(ExpandConstant('{cmd}'),'/C mkdir ka-lite\kalite & xcopy /y /s '+ExpandConstant('{tmp}')+'\ka-lite\kalite\* ka-lite\kalite', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, restoreKaliteFolder);
            end;

            if DirExists(ExpandConstant('{tmp}')+'\ka-lite\content') then
            begin
                Exec(ExpandConstant('{cmd}'),'/C mkdir ka-lite\content & xcopy /y /s '+ExpandConstant('{tmp}')+'\ka-lite\content\* ka-lite\content', ExpandConstant('{app}'), SW_HIDE, ewWaitUntilTerminated, restoreContentFolder);
            end;
        end;

    end;

    if CurStep = ssPostInstall then
    begin
        if installFlag then
        begin
            HandlePipSetup();
            begin
                DoSetup;
            end;
        end;
    end;
end;

{ Called just prior to uninstall finishing. }
{ Clean up things we did during uninstall: }
{ * Remove environment variable KALITE_SCRIPT_DIR, which is set starting in version 0.16.x }
{ * Previously (versions 0.13.x to 0.15.x) KALITE_ROOT_DATA_PATH was set -- it should be unset by the respective }
{   uninstallers of those versions }
procedure DeinitializeUninstall();
begin
    RegDeleteValue(
        HKLM,
        'System\CurrentControlSet\Control\Session Manager\Environment',
        'KALITE_SCRIPT_DIR'
    )
end;


Fix Windows installer project

Fix Windows installer project

[Setup]
AppName=Traccar
AppVersion=2.12
DefaultDirName={pf}\Traccar
AlwaysRestart=yes

[Dirs]
Name: "{app}\bin"
Name: "{app}\conf"
Name: "{app}\data"
Name: "{app}\lib"
Name: "{app}\logs"
Name: "{app}\web"

[Files]
Source: "..\wrapper\bin\wrapper-windows-x86-32.exe"; DestDir: "{app}\bin"; DestName: "wrapper.exe"
Source: "..\wrapper\src\bin\App.bat.in"; DestDir: "{app}\bin"; DestName: "Traccar.bat"
Source: "..\wrapper\src\bin\InstallApp-NT.bat.in"; DestDir: "{app}\bin"; DestName: "InstallTraccar-NT.bat"
Source: "..\wrapper\src\bin\UninstallApp-NT.bat.in"; DestDir: "{app}\bin"; DestName: "UninstallTraccar-NT.bat"
Source: "..\wrapper\lib\wrapper-windows-x86-32.dll"; DestDir: "{app}\lib"; DestName: "wrapper.dll"
Source: "..\wrapper\lib\wrapper.jar"; DestDir: "{app}\lib";
Source: "..\wrapper\src\conf\wrapper.conf.in"; DestDir: "{app}\conf"; DestName: "wrapper.conf"; AfterInstall: ConfigureWrapper

Source: "..\..\target\tracker-server.jar"; DestDir: "{app}"
Source: "..\..\target\lib\*"; DestDir: "{app}\lib"
Source: "..\..\web\*"; DestDir: "{app}\web"; Flags: recursesubdirs
Source: "traccar.xml"; DestDir: "{app}\conf"; AfterInstall: ConfigureApplication

[Run]
Filename: "{app}\bin\InstallTraccar-NT.bat"

[UninstallRun]
Filename: "{app}\bin\UninstallTraccar-NT.bat"

[Code]
function GetLocalMachine(): Integer;
begin
  if IsWin64 then
  begin
    Result := HKLM64;
  end
  else
  begin
    Result := HKEY_LOCAL_MACHINE;
  end;
end;

function InitializeSetup(): Boolean;
begin
  if RegKeyExists(GetLocalMachine(), 'SOFTWARE\JavaSoft\Java Runtime Environment') then
  begin
    Result := true;
  end
  else
  begin
    Result := false;
    MsgBox('This application requires Java Runtime Environment version 1.6 or later. Please download and install the JRE and run this setup again.', mbCriticalError, MB_OK);
  end;
end;

procedure ConfigureWrapper();
var
  S: String;
begin
  LoadStringFromFile(ExpandConstant(CurrentFileName), S);
  Insert('wrapper.java.classpath.2=../tracker-server.jar' + #13#10, S, Pos('wrapper.java.classpath.1', S));
  Insert(ExpandConstant('wrapper.app.parameter.2="{app}\conf\traccar.xml"') + #13#10, S, Pos('wrapper.app.parameter.1', S));
  StringChangeEx(S, '<YourMainClass>', 'org.traccar.Main', true);
  StringChangeEx(S, '@app.name@', 'Traccar', true);
  StringChangeEx(S, '@app.long.name@', 'Traccar', true);
  StringChangeEx(S, '@app.description@', 'Traccar', true);
  StringChangeEx(S, 'wrapper.logfile=../logs/wrapper.log', 'wrapper.logfile=../logs/wrapper.log.YYYYMMDD' + #13#10 + 'wrapper.logfile.rollmode=DATE', true);
  SaveStringToFile(ExpandConstant(CurrentFileName), S, false);
end;

procedure ConfigureApplication();
var
  S: String;
begin
  LoadStringFromFile(ExpandConstant(CurrentFileName), S);
  StringChangeEx(S, '[WEB]', ExpandConstant('{app}\web'), true);
  StringChangeEx(S, '[LOG]', ExpandConstant('{app}\logs\tracker-server.log'), true);
  StringChangeEx(S, '[DATABASE]', ExpandConstant('{app}\data\database'), true);
  SaveStringToFile(ExpandConstant(CurrentFileName), S, false);
end;

[Setup]
AppName=Traccar
AppVersion=2.12
DefaultDirName={pf}\Traccar
AlwaysRestart=yes

[Dirs]
Name: "{app}\bin"
Name: "{app}\conf"
Name: "{app}\data"
Name: "{app}\lib"
Name: "{app}\logs"
Name: "{app}\web"

[Files]
Source: "..\wrapper\bin\wrapper-windows-x86-32.exe"; DestDir: "{app}\bin"; DestName: "wrapper.exe"
Source: "..\wrapper\src\bin\App.bat.in"; DestDir: "{app}\bin"; DestName: "Traccar.bat"
Source: "..\wrapper\src\bin\InstallApp-NT.bat.in"; DestDir: "{app}\bin"; DestName: "InstallTraccar-NT.bat"
Source: "..\wrapper\src\bin\UninstallApp-NT.bat.in"; DestDir: "{app}\bin"; DestName: "UninstallTraccar-NT.bat"
Source: "..\wrapper\lib\wrapper-windows-x86-32.dll"; DestDir: "{app}\lib"; DestName: "wrapper.dll"
Source: "..\wrapper\lib\wrapper.jar"; DestDir: "{app}\lib";
Source: "..\wrapper\src\conf\wrapper.conf.in"; DestDir: "{app}\conf"; DestName: "wrapper.conf"; AfterInstall: ConfigureWrapper

Source: "..\..\target\tracker-server.jar"; DestDir: "{app}"
Source: "..\..\target\lib\*"; DestDir: "{app}\lib"
Source: "..\..\web\*"; DestDir: "{app}\web"
Source: "traccar.xml"; DestDir: "{app}\conf"; AfterInstall: ConfigureApplication

[Run]
Filename: "{app}\bin\InstallTraccar-NT.bat"

[UninstallRun]
Filename: "{app}\bin\UninstallTraccar-NT.bat"

[Code]
function GetLocalMachine(): Integer;
begin
  if IsWin64 then
  begin
    Result := HKLM64;
  end
  else
  begin
    Result := HKEY_LOCAL_MACHINE;
  end;
end;

function InitializeSetup(): Boolean;
begin
  if RegKeyExists(GetLocalMachine(), 'SOFTWARE\JavaSoft\Java Runtime Environment') then
  begin
    Result := true;
  end
  else
  begin
    Result := false;
    MsgBox('This application requires Java Runtime Environment version 1.6 or later. Please download and install the JRE and run this setup again.', mbCriticalError, MB_OK);
  end;
end;

procedure ConfigureWrapper();
var
  S: String;
begin
  LoadStringFromFile(ExpandConstant(CurrentFileName), S);
  Insert('wrapper.java.classpath.2=../tracker-server.jar' + #13#10, S, Pos('wrapper.java.classpath.1', S));
  Insert(ExpandConstant('wrapper.app.parameter.2="{app}\conf\traccar.xml"') + #13#10, S, Pos('wrapper.app.parameter.1', S));
  StringChangeEx(S, '<YourMainClass>', 'org.traccar.Main', true);
  StringChangeEx(S, '@app.name@', 'Traccar', true);
  StringChangeEx(S, '@app.long.name@', 'Traccar', true);
  StringChangeEx(S, '@app.description@', 'Traccar', true);
  StringChangeEx(S, 'wrapper.logfile=../logs/wrapper.log', 'wrapper.logfile=../logs/wrapper.log.YYYYMMDD' + #13#10 + 'wrapper.logfile.rollmode=DATE', true);
  SaveStringToFile(ExpandConstant(CurrentFileName), S, false);
end;

procedure ConfigureApplication();
var
  S: String;
begin
  LoadStringFromFile(ExpandConstant(CurrentFileName), S);
  StringChangeEx(S, '[WEB]', ExpandConstant('{app}\web'), true);
  StringChangeEx(S, '[LOG]', ExpandConstant('{app}\logs\tracker-server.log'), true);
  StringChangeEx(S, '[DATABASE]', ExpandConstant('{app}\data\database'), true);
  SaveStringToFile(ExpandConstant(CurrentFileName), S, false);
end;


Windows installer script updated

Windows installer script updated


Add notifications custom step

Add notifications custom step

#define MyAppName "Gmail Notifier"
#define MyAppVersion "2.4.3.0"
#define MyAppShortVersion "2.4"
#define MyAppYear GetDateTimeString('yyyy', '', '');
#define MyAppPublisher "Xavier Foucrier"
#define MyAppURL "https://github.com/xavierfoucrier/gmail-notifier"
#define MyAppExeName "Gmail notifier.exe"
#define MyAppRegistryKeyName "Gmail notifier"

[Setup]
AppId={{7E60E047-C79B-49A4-8CF6-B33D5565B2E8}
AppName={#MyAppName}
AppVersion={#MyAppVersion}
AppCopyright=Copyright (c) {#MyAppYear} {#MyAppPublisher}
AppVerName={#MyAppName} {#MyAppVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
AppMutex=gmailnotifier-115e363ecbfefd771e55c6874680bc0a
DefaultDirName={pf}\{#MyAppName}
DefaultGroupName={#MyAppName}
AllowNoIcons=yes
LicenseFile=..\LICENSE.md
OutputDir=..\setup
ArchitecturesInstallIn64BitMode=x64
OutputBaseFilename={#MyAppName} {#MyAppShortVersion}
SetupIconFile=setup.ico
Compression=lzma
SolidCompression=yes
PrivilegesRequired=admin
VersionInfoVersion={#MyAppVersion}
UninstallDisplayIcon={app}\{#MyAppExeName}

[Languages]
Name: "en"; MessagesFile: "compiler:Default.isl"
Name: "fr"; MessagesFile: "compiler:Languages\French.isl"
Name: "de"; MessagesFile: "compiler:Languages\German.isl"

[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
Name: "quicklaunchicon"; Description: "{cm:CreateQuickLaunchIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked; OnlyBelowVersion: 0,6.1
Name: "startup"; Description: "{cm:AutoStartProgram,{#MyAppName}}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: checkablealone;

[Files]
Source: "..\code\bin\Release 32 bits (x86)\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion; Check: not Is64BitInstallMode
Source: "..\code\bin\Release 32 bits (x86)\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs; Check: not Is64BitInstallMode
Source: "..\code\bin\Release 64 bits (x64)\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion; Check: Is64BitInstallMode
Source: "..\code\bin\Release 64 bits (x64)\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs; Check: Is64BitInstallMode

[Icons]
Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
Name: "{group}\{cm:ProgramOnTheWeb,{#MyAppName}}"; Filename: "{#MyAppURL}"
Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
Name: "{commondesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
Name: "{userappdata}\Microsoft\Internet Explorer\Quick Launch\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: quicklaunchicon

[Run]
Filename: "{app}\{#MyAppExeName}"; Parameters: "install {language} {code:autorun}"; Flags: runhidden
Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall

[Registry]
Root: HKCU; Subkey: "Software\Microsoft\Windows\CurrentVersion\Run"; ValueType: string; ValueName: "{#MyAppRegistryKeyName}"; ValueData: "{app}\{#MyAppExeName}"; Tasks: startup; Flags: uninsdeletevalue;

[Code]
function autorun(Value: string): string;
begin
	if RegValueExists(HKCU, 'Software\Microsoft\Windows\CurrentVersion\Run', '{#MyAppRegistryKeyName}') then begin
		Result := 'auto';
	end	else begin
		Result := 'none';
	end;
end;

var
  Notifications: TInputOptionWizardPage;

procedure InitializeWizard;
begin
	Notifications := CreateInputOptionPage(wpInfoBefore, 'Configuration de l''aplication', 'Notifications de l''application', 'Quel comportement souhaitez vous adopter pour les notifications ?', False, False);
	Notifications.Add('&Nouveau message');
	Notifications.Values[0] := True;

	Notifications.Add('&Courriers ind�sirables (SPAM)');
	Notifications.Values[1] := True;

	Notifications.Add('&Notification sonore');
	Notifications.Values[2] := True;

end;

[UninstallDelete]
Type: filesandordirs; Name: "{localappdata}\{#MyAppName}"

#define MyAppName "Gmail Notifier"
#define MyAppVersion "2.4.3.0"
#define MyAppShortVersion "2.4"
#define MyAppYear GetDateTimeString('yyyy', '', '');
#define MyAppPublisher "Xavier Foucrier"
#define MyAppURL "https://github.com/xavierfoucrier/gmail-notifier"
#define MyAppExeName "Gmail notifier.exe"
#define MyAppRegistryKeyName "Gmail notifier"

[Setup]
AppId={{7E60E047-C79B-49A4-8CF6-B33D5565B2E8}
AppName={#MyAppName}
AppVersion={#MyAppVersion}
AppCopyright=Copyright (c) {#MyAppYear} {#MyAppPublisher}
AppVerName={#MyAppName} {#MyAppVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
AppMutex=gmailnotifier-115e363ecbfefd771e55c6874680bc0a
DefaultDirName={pf}\{#MyAppName}
DefaultGroupName={#MyAppName}
AllowNoIcons=yes
LicenseFile=..\LICENSE.md
OutputDir=..\setup
ArchitecturesInstallIn64BitMode=x64
OutputBaseFilename={#MyAppName} {#MyAppShortVersion}
SetupIconFile=setup.ico
Compression=lzma
SolidCompression=yes
PrivilegesRequired=admin
VersionInfoVersion={#MyAppVersion}
UninstallDisplayIcon={app}\{#MyAppExeName}

[Languages]
Name: "en"; MessagesFile: "compiler:Default.isl"
Name: "fr"; MessagesFile: "compiler:Languages\French.isl"
Name: "de"; MessagesFile: "compiler:Languages\German.isl"

[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
Name: "quicklaunchicon"; Description: "{cm:CreateQuickLaunchIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked; OnlyBelowVersion: 0,6.1
Name: "startup"; Description: "{cm:AutoStartProgram,{#MyAppName}}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: checkablealone;

[Files]
Source: "..\code\bin\Release 32 bits (x86)\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion; Check: not Is64BitInstallMode
Source: "..\code\bin\Release 32 bits (x86)\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs; Check: not Is64BitInstallMode
Source: "..\code\bin\Release 64 bits (x64)\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion; Check: Is64BitInstallMode
Source: "..\code\bin\Release 64 bits (x64)\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs; Check: Is64BitInstallMode

[Icons]
Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
Name: "{group}\{cm:ProgramOnTheWeb,{#MyAppName}}"; Filename: "{#MyAppURL}"
Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
Name: "{commondesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
Name: "{userappdata}\Microsoft\Internet Explorer\Quick Launch\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: quicklaunchicon

[Run]
Filename: "{app}\{#MyAppExeName}"; Parameters: "install {language} {code:autorun}"; Flags: runhidden
Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall

[Registry]
Root: HKCU; Subkey: "Software\Microsoft\Windows\CurrentVersion\Run"; ValueType: string; ValueName: "{#MyAppRegistryKeyName}"; ValueData: "{app}\{#MyAppExeName}"; Tasks: startup; Flags: uninsdeletevalue;

[Code]
function autorun(Value: string): string;
begin
	if RegValueExists(HKCU, 'Software\Microsoft\Windows\CurrentVersion\Run', '{#MyAppRegistryKeyName}') then begin
		Result := 'auto';
	end	else begin
		Result := 'none';
	end;
end;

[UninstallDelete]
Type: filesandordirs; Name: "{localappdata}\{#MyAppName}"


installers.windows: Correct typo in comment

; To successfully compile the installer, run `compile_installer.bat` instead
; with specified parameters.

#define PLUGIN_TITLE "Export Layers"
#define INSTALLER_NAME PLUGIN_TITLE + " for GIMP"

[Setup]
AppName={#INSTALLER_NAME}
AppVersion={#PLUGIN_VERSION}
AppVerName={#INSTALLER_NAME} {#PLUGIN_VERSION}
AppPublisher={#AUTHOR_NAME}
DefaultDirName={code:GetPluginsDirpath}
DefaultGroupName=GIMP
DisableProgramGroupPage=Yes
DisableDirPage=Yes
UninstallFilesDir={app}\{#PLUGIN_NAME}
PrivilegesRequired=admin
DirExistsWarning=no
OutputDir={#OUTPUT_DIRPATH}
OutputBaseFilename={#OUTPUT_FILENAME_PREFIX}
WizardSmallImageFile=logo_wizard.bmp
WizardImageFile=menu_path.bmp
SetupIconFile=icon_installer.ico
UninstallDisplayIcon=logo.ico

[Files]
Source: {#INPUT_DIRPATH}\*; DestDir: "{app}"; Flags: ignoreversion recursesubdirs
Source: logo_wizard.bmp; Flags: dontcopy
Source: menu_path.bmp; Flags: dontcopy
Source: icon_installer.ico; Flags: dontcopy
Source: logo.ico; Flags: dontcopy

[Messages]
ReadyLabel2b=Click Install to continue with the installation of {#PLUGIN_TITLE}, or click Customize to modify the installation.
FinishedLabelNoIcons={#PLUGIN_TITLE} successfully installed. To run the plug-in, start GIMP (or restart if already running) and go to File → Export Layers.

[UninstallDelete]
Type: filesandordirs; Name: "{app}\{#PLUGIN_NAME}"

[Code]

const
  GIMP_REG_PATH = 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\GIMP-2_is1';
  GIMP_NOT_FOUND_MESSAGE = (
    'Could not find GIMP installation path.'
    + ' Please specify the path to GIMP and GIMP plug-ins manually.'
    + ' If GIMP is not installed, abort this installation and install GIMP first.');
  PYTHON_NOT_FOUND_IN_GIMP_MESSAGE = (
    'It appears that your GIMP installation does not support Python scripting.'
    + ' Please install GIMP with enabled support for Python scripting before proceeding.');

  MIN_REQUIRED_GIMP_VERSION_MAJOR = 2;
  MIN_REQUIRED_GIMP_VERSION_MINOR = 8;
  MIN_REQUIRED_GIMP_VERSION = '2.8';

  NUM_CUSTOM_PAGES = 2;

type
  TVersionArray = array [0..1] of Integer;

var
  PluginsDirpath: String;
  GimpDirpath: String;
  GimpVersionMajorMinor: TVersionArray;

  CustomPathsPage: TInputDirWizardPage;
  PluginsDirpathEdit: TEdit;
  GimpDirpathEdit: TEdit;

  SelectPluginInstallPathPage: TInputOptionWizardPage;

  IsGimpDetected: Boolean;
  InstallerState: (Initialized, ReadyToInstall);

  CustomizeButton: TNewButton;

procedure AddCustomizeToInstallPage; forward;
procedure OnCustomizeClicked(sender: TObject); forward;
function GetButtonWidthFitToCaption(const caption: String; const xSpacing: Integer) : Integer; forward;

procedure CreateSelectPluginInstallPathPage(const afterID: Integer); forward;
procedure CreateCustomPathsPage(const afterID: Integer); forward;

function ShouldSpecifyCustomPluginsDirpath : Boolean; forward;
procedure CheckPythonScriptingEnabled; forward;

function GetLocalPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String; forward;
function GetSystemPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String; forward;
function GetGimpVersionMajorMinor(const gimpVersion: String) : TVersionArray; forward;
function GetGimpVersionStr(const gimpVersionArray: array of Integer) : String; forward;

function GetPluginsDirpath(value: String) : String;
begin
  Result := PluginsDirpath;
end;

function InitializeSetup() : Boolean;
var
  gimpVersion: String;
begin
  Result := True;

  InstallerState := Initialized;
  IsGimpDetected := True;

  if (not RegQueryStringValue(HKLM64, GIMP_REG_PATH, 'DisplayVersion', gimpVersion)
      and not RegQueryStringValue(HKLM32, GIMP_REG_PATH, 'DisplayVersion', gimpVersion)) then begin
    MsgBox(GIMP_NOT_FOUND_MESSAGE, mbInformation, MB_OK);
    IsGimpDetected := False;
    Exit;
  end;

  GimpVersionMajorMinor := GetGimpVersionMajorMinor(gimpVersion);

  if (GimpVersionMajorMinor[0] <= MIN_REQUIRED_GIMP_VERSION_MAJOR) and (GimpVersionMajorMinor[1] < MIN_REQUIRED_GIMP_VERSION_MINOR) then begin
    MsgBox(
      'GIMP version ' + GetGimpVersionStr(GimpVersionMajorMinor) + ' detected.'
      + ' To use {#PLUGIN_TITLE}, install GIMP ' + MIN_REQUIRED_GIMP_VERSION + ' or later.'
      + ' If you do have GIMP ' + MIN_REQUIRED_GIMP_VERSION + ' or later installed, '
      + 'specify the path to GIMP and GIMP plug-ins manually.'
      + ' Otherwise, abort this installation and install GIMP with a sufficient version first.',
      mbInformation,
      MB_OK);

      IsGimpDetected := False;
      Exit;
  end;

  PluginsDirpath := GetLocalPluginsDirpath(GimpVersionMajorMinor);

  if (not RegQueryStringValue(HKLM64, GIMP_REG_PATH, 'InstallLocation', GimpDirpath)
      and not RegQueryStringValue(HKLM32, GIMP_REG_PATH, 'InstallLocation', GimpDirpath)) then begin
    MsgBox(GIMP_NOT_FOUND_MESSAGE, mbInformation, MB_OK);
    IsGimpDetected := False;
    Exit;
  end
  else begin
    if GimpDirpath[Length(GimpDirpath)] = '\' then begin
      GimpDirpath := Copy(GimpDirpath, 1, Length(GimpDirpath) - 1);
    end;
  end;

  CheckPythonScriptingEnabled();
end;

procedure InitializeWizard;
begin
  AddCustomizeToInstallPage();

  CreateSelectPluginInstallPathPage(wpWelcome);
  CreateCustomPathsPage(SelectPluginInstallPathPage.ID);
end;

function NextButtonClick(curPageID: Integer) : Boolean;
begin
  Result := True;

  if curPageID = CustomPathsPage.ID then begin
    GimpDirpath := GimpDirpathEdit.Text;
    PluginsDirpath := PluginsDirpathEdit.Text;

    CheckPythonScriptingEnabled();
  end
  else if curPageID = SelectPluginInstallPathPage.ID then begin
    if SelectPluginInstallPathPage.values[0] then begin
      PluginsDirpath := GetLocalPluginsDirpath(GimpVersionMajorMinor);
    end
    else if SelectPluginInstallPathPage.values[1] then begin
      PluginsDirpath := GetSystemPluginsDirpath(GimpVersionMajorMinor);
    end;

    PluginsDirpathEdit.Text := PluginsDirpath;
  end;
end;

function ShouldSkipPage(pageID: Integer) : Boolean;
var
  isInstallerStarted: Boolean;
  isInstallerStartedWithGimpNotDetected: Boolean;
  shouldSkipCustomPathsPage: Boolean;
begin
  isInstallerStarted := (
    (pageID <> wpReady)
    and (InstallerState = Initialized)
    and IsGimpDetected);

  isInstallerStartedWithGimpNotDetected := (
    (pageID = SelectPluginInstallPathPage.ID)
    and (InstallerState = Initialized)
    and not IsGimpDetected);

  shouldSkipCustomPathsPage := (
    (pageID = CustomPathsPage.ID)
    and (InstallerState <> Initialized)
    and not ShouldSpecifyCustomPluginsDirpath());

  Result := (
    isInstallerStarted
    or isInstallerStartedWithGimpNotDetected
    or shouldSkipCustomPathsPage);
end;

procedure CurPageChanged(curPageID: Integer);
begin
  CustomizeButton.visible := (curPageID = wpReady) and IsGimpDetected;

  if (curPageID = CustomPathsPage.ID) and not IsGimpDetected then begin
    WizardForm.BackButton.visible := False;
  end;

  if curPageID = wpReady then begin
    InstallerState := ReadyToInstall;

    // Assign correct value to `DefaultDirName` (it may be empty or incorrect at this point).
    WizardForm.DirEdit.Text := PluginsDirpath;
  end;
end;

procedure AddCustomizeToInstallPage;
begin
  CustomizeButton := TNewButton.Create(WizardForm);

  with CustomizeButton do begin
    Caption := 'Customize';
    Parent := WizardForm;
    Width := GetButtonWidthFitToCaption(Caption, 12);
    Height := WizardForm.NextButton.Height;
    Left := WizardForm.ClientWidth - (WizardForm.CancelButton.Left + WizardForm.CancelButton.Width);
    Top := WizardForm.NextButton.Top;

    OnClick := @OnCustomizeClicked;
  end;
end;

procedure OnCustomizeClicked(sender: TObject);
var
  i: Integer;
begin
  for i := 0 to NUM_CUSTOM_PAGES - 1 do begin
    WizardForm.BackButton.OnClick(TNewButton(sender).Parent);
  end;
end;

function GetButtonWidthFitToCaption(const caption: String; const xSpacing: Integer) : Integer;
var
  dummyLabel: TNewStaticText;
  defaultWidth: Integer;
begin
  dummyLabel := TNewStaticText.Create(WizardForm);

  dummyLabel.Autosize := True;
  dummyLabel.Caption := caption;

  defaultWidth := WizardForm.NextButton.Width;

  if defaultWidth >= dummyLabel.Width + ScaleX(xSpacing) then begin
    Result := defaultWidth;
  end
  else begin
    Result := dummyLabel.Width + ScaleX(xSpacing);
  end;

  dummyLabel.Free;
end;

procedure CreateSelectPluginInstallPathPage(const afterID: Integer);
begin
  SelectPluginInstallPathPage := CreateInputOptionPage(
    afterID,
    'Select Installation Path',
    'Where should {#PLUGIN_TITLE} be installed?',
    'Select one of the options below:',
    True,
    False
  );

  SelectPluginInstallPathPage.Add('Install for just me');
  SelectPluginInstallPathPage.Add(
    'Install for all users');
  SelectPluginInstallPathPage.Add('Choose custom installation path');

  SelectPluginInstallPathPage.Values[0] := True;
end;

procedure CreateCustomPathsPage(const afterID: Integer);
var
  lastAddedDirIndex: Integer;
begin
  CustomPathsPage := CreateInputDirPage(
    afterID,
    'Select Location for GIMP and GIMP Plug-ins',
    'Where is GIMP located and where should {#PLUGIN_TITLE} be installed?',
    'Specify custom directory path to a working GIMP installation and to GIMP plug-ins.',
    False,
    'New Folder');

  lastAddedDirIndex := CustomPathsPage.Add('Path to GIMP installation');
  GimpDirpathEdit := CustomPathsPage.Edits[lastAddedDirIndex];
  CustomPathsPage.Values[0] := GimpDirpath;

  lastAddedDirIndex := CustomPathsPage.Add('Path to GIMP plug-ins');
  PluginsDirpathEdit := CustomPathsPage.Edits[lastAddedDirIndex];
  CustomPathsPage.Values[1] := PluginsDirpath;
end;

function ShouldSpecifyCustomPluginsDirpath : Boolean;
begin
  Result := SelectPluginInstallPathPage.values[2];
end;

procedure CheckPythonScriptingEnabled;
var
  possiblePythonDirpaths: TStringList;
  i: Integer;
  pythonPathFound: Boolean;
begin
  pythonPathFound := False;

  possiblePythonDirpaths := TStringList.Create;
  possiblePythonDirpaths.Add(GimpDirpath + '\Python');
  possiblePythonDirpaths.Add(GimpDirpath + '\32\lib\python2.7');
  possiblePythonDirpaths.Add(GimpDirpath + '\lib\python2.7');

  for i := 0 to possiblePythonDirpaths.Count - 1 do begin
    if DirExists(possiblePythonDirpaths[i]) then begin
      pythonPathFound := True;
      break;
    end;
  end;

  possiblePythonDirpaths.Free;

  if not pythonPathFound then begin
    MsgBox(PYTHON_NOT_FOUND_IN_GIMP_MESSAGE, mbInformation, MB_OK);
    Abort();
  end;
end;

function GetLocalPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String;
var
  gimpVersionMajorMinorStr: String;
begin
  gimpVersionMajorMinorStr := GetGimpVersionStr(gimpVersionMajorMinor);

  if (gimpVersionMajorMinor[0] <= 2) and (gimpVersionMajorMinor[1] < 9) then begin
    Result := ExpandConstant('{%USERPROFILE}') + '\.gimp-' + gimpVersionMajorMinorStr + '\plug-ins';
  end
  else begin
    Result := ExpandConstant('{userappdata}') + '\GIMP\' + gimpVersionMajorMinorStr + '\plug-ins';
  end;
end;

function GetSystemPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String;
begin
  Result := GimpDirpath + '\lib\gimp\' + IntToStr(gimpVersionMajorMinor[0]) + '.0\plug-ins';
end;

function GetGimpVersionMajorMinor(const gimpVersion: String) : TVersionArray;
var
  versionNumberMajorMinor: TVersionArray;
  i: Integer;
  versionNumberFields: array of Integer;
  versionNumberFieldCurrentArrayIndex: Integer;
  versionNumberFieldStartIndex: Integer;
begin
  versionNumberFieldCurrentArrayIndex := 0;
  versionNumberFieldStartIndex := 1;

  for i := 1 to Length(gimpVersion) do begin
    if gimpVersion[i] = '.' then begin
      SetArrayLength(versionNumberFields, GetArrayLength(versionNumberFields) + 1);
      versionNumberFields[versionNumberFieldCurrentArrayIndex] := (
        StrToIntDef(
          Copy(
            gimpVersion, versionNumberFieldStartIndex, i - versionNumberFieldStartIndex), -1));
      versionNumberFieldCurrentArrayIndex := versionNumberFieldCurrentArrayIndex + 1;
      versionNumberFieldStartIndex := i + 1;
    end;
  end;

  if versionNumberFieldStartIndex <= Length(gimpVersion) then begin
    SetArrayLength(versionNumberFields, GetArrayLength(versionNumberFields) + 1);
    versionNumberFields[versionNumberFieldCurrentArrayIndex] := (
      StrToIntDef(
        Copy(
          gimpVersion, versionNumberFieldStartIndex, Length(gimpVersion) + 1 - versionNumberFieldStartIndex), -1));
  end;

  versionNumberMajorMinor[0] := versionNumberFields[0];
  versionNumberMajorMinor[1] := versionNumberFields[1];

  Result := versionNumberMajorMinor;
end;

function GetGimpVersionStr(const gimpVersionArray: array of Integer) : String;
var
  i: Integer;
  gimpVersionStr: String;
begin
  gimpVersionStr := '';

  for i := 0 to Length(gimpVersionArray) - 1 do begin
    gimpVersionStr := gimpVersionStr + IntToStr(gimpVersionArray[i]) + '.';
  end;

  Result := Copy(gimpVersionStr, 1, Length(gimpVersionStr) - 1);
end;

; To successfully compilte the installer, run `compile_installer.bat` instead
; with specified parameters.

#define PLUGIN_TITLE "Export Layers"
#define INSTALLER_NAME PLUGIN_TITLE + " for GIMP"

[Setup]
AppName={#INSTALLER_NAME}
AppVersion={#PLUGIN_VERSION}
AppVerName={#INSTALLER_NAME} {#PLUGIN_VERSION}
AppPublisher={#AUTHOR_NAME}
DefaultDirName={code:GetPluginsDirpath}
DefaultGroupName=GIMP
DisableProgramGroupPage=Yes
DisableDirPage=Yes
UninstallFilesDir={app}\{#PLUGIN_NAME}
PrivilegesRequired=admin
DirExistsWarning=no
OutputDir={#OUTPUT_DIRPATH}
OutputBaseFilename={#OUTPUT_FILENAME_PREFIX}
WizardSmallImageFile=logo_wizard.bmp
WizardImageFile=menu_path.bmp
SetupIconFile=icon_installer.ico
UninstallDisplayIcon=logo.ico

[Files]
Source: {#INPUT_DIRPATH}\*; DestDir: "{app}"; Flags: ignoreversion recursesubdirs
Source: logo_wizard.bmp; Flags: dontcopy
Source: menu_path.bmp; Flags: dontcopy
Source: icon_installer.ico; Flags: dontcopy
Source: logo.ico; Flags: dontcopy

[Messages]
ReadyLabel2b=Click Install to continue with the installation of {#PLUGIN_TITLE}, or click Customize to modify the installation.
FinishedLabelNoIcons={#PLUGIN_TITLE} successfully installed. To run the plug-in, start GIMP (or restart if already running) and go to File → Export Layers.

[UninstallDelete]
Type: filesandordirs; Name: "{app}\{#PLUGIN_NAME}"

[Code]

const
  GIMP_REG_PATH = 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\GIMP-2_is1';
  GIMP_NOT_FOUND_MESSAGE = (
    'Could not find GIMP installation path.'
    + ' Please specify the path to GIMP and GIMP plug-ins manually.'
    + ' If GIMP is not installed, abort this installation and install GIMP first.');
  PYTHON_NOT_FOUND_IN_GIMP_MESSAGE = (
    'It appears that your GIMP installation does not support Python scripting.'
    + ' Please install GIMP with enabled support for Python scripting before proceeding.');

  MIN_REQUIRED_GIMP_VERSION_MAJOR = 2;
  MIN_REQUIRED_GIMP_VERSION_MINOR = 8;
  MIN_REQUIRED_GIMP_VERSION = '2.8';

  NUM_CUSTOM_PAGES = 2;

type
  TVersionArray = array [0..1] of Integer;

var
  PluginsDirpath: String;
  GimpDirpath: String;
  GimpVersionMajorMinor: TVersionArray;

  CustomPathsPage: TInputDirWizardPage;
  PluginsDirpathEdit: TEdit;
  GimpDirpathEdit: TEdit;

  SelectPluginInstallPathPage: TInputOptionWizardPage;

  IsGimpDetected: Boolean;
  InstallerState: (Initialized, ReadyToInstall);

  CustomizeButton: TNewButton;

procedure AddCustomizeToInstallPage; forward;
procedure OnCustomizeClicked(sender: TObject); forward;
function GetButtonWidthFitToCaption(const caption: String; const xSpacing: Integer) : Integer; forward;

procedure CreateSelectPluginInstallPathPage(const afterID: Integer); forward;
procedure CreateCustomPathsPage(const afterID: Integer); forward;

function ShouldSpecifyCustomPluginsDirpath : Boolean; forward;
procedure CheckPythonScriptingEnabled; forward;

function GetLocalPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String; forward;
function GetSystemPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String; forward;
function GetGimpVersionMajorMinor(const gimpVersion: String) : TVersionArray; forward;
function GetGimpVersionStr(const gimpVersionArray: array of Integer) : String; forward;

function GetPluginsDirpath(value: String) : String;
begin
  Result := PluginsDirpath;
end;

function InitializeSetup() : Boolean;
var
  gimpVersion: String;
begin
  Result := True;

  InstallerState := Initialized;
  IsGimpDetected := True;

  if (not RegQueryStringValue(HKLM64, GIMP_REG_PATH, 'DisplayVersion', gimpVersion)
      and not RegQueryStringValue(HKLM32, GIMP_REG_PATH, 'DisplayVersion', gimpVersion)) then begin
    MsgBox(GIMP_NOT_FOUND_MESSAGE, mbInformation, MB_OK);
    IsGimpDetected := False;
    Exit;
  end;

  GimpVersionMajorMinor := GetGimpVersionMajorMinor(gimpVersion);

  if (GimpVersionMajorMinor[0] <= MIN_REQUIRED_GIMP_VERSION_MAJOR) and (GimpVersionMajorMinor[1] < MIN_REQUIRED_GIMP_VERSION_MINOR) then begin
    MsgBox(
      'GIMP version ' + GetGimpVersionStr(GimpVersionMajorMinor) + ' detected.'
      + ' To use {#PLUGIN_TITLE}, install GIMP ' + MIN_REQUIRED_GIMP_VERSION + ' or later.'
      + ' If you do have GIMP ' + MIN_REQUIRED_GIMP_VERSION + ' or later installed, '
      + 'specify the path to GIMP and GIMP plug-ins manually.'
      + ' Otherwise, abort this installation and install GIMP with a sufficient version first.',
      mbInformation,
      MB_OK);

      IsGimpDetected := False;
      Exit;
  end;

  PluginsDirpath := GetLocalPluginsDirpath(GimpVersionMajorMinor);

  if (not RegQueryStringValue(HKLM64, GIMP_REG_PATH, 'InstallLocation', GimpDirpath)
      and not RegQueryStringValue(HKLM32, GIMP_REG_PATH, 'InstallLocation', GimpDirpath)) then begin
    MsgBox(GIMP_NOT_FOUND_MESSAGE, mbInformation, MB_OK);
    IsGimpDetected := False;
    Exit;
  end
  else begin
    if GimpDirpath[Length(GimpDirpath)] = '\' then begin
      GimpDirpath := Copy(GimpDirpath, 1, Length(GimpDirpath) - 1);
    end;
  end;

  CheckPythonScriptingEnabled();
end;

procedure InitializeWizard;
begin
  AddCustomizeToInstallPage();

  CreateSelectPluginInstallPathPage(wpWelcome);
  CreateCustomPathsPage(SelectPluginInstallPathPage.ID);
end;

function NextButtonClick(curPageID: Integer) : Boolean;
begin
  Result := True;

  if curPageID = CustomPathsPage.ID then begin
    GimpDirpath := GimpDirpathEdit.Text;
    PluginsDirpath := PluginsDirpathEdit.Text;

    CheckPythonScriptingEnabled();
  end
  else if curPageID = SelectPluginInstallPathPage.ID then begin
    if SelectPluginInstallPathPage.values[0] then begin
      PluginsDirpath := GetLocalPluginsDirpath(GimpVersionMajorMinor);
    end
    else if SelectPluginInstallPathPage.values[1] then begin
      PluginsDirpath := GetSystemPluginsDirpath(GimpVersionMajorMinor);
    end;

    PluginsDirpathEdit.Text := PluginsDirpath;
  end;
end;

function ShouldSkipPage(pageID: Integer) : Boolean;
var
  isInstallerStarted: Boolean;
  isInstallerStartedWithGimpNotDetected: Boolean;
  shouldSkipCustomPathsPage: Boolean;
begin
  isInstallerStarted := (
    (pageID <> wpReady)
    and (InstallerState = Initialized)
    and IsGimpDetected);

  isInstallerStartedWithGimpNotDetected := (
    (pageID = SelectPluginInstallPathPage.ID)
    and (InstallerState = Initialized)
    and not IsGimpDetected);

  shouldSkipCustomPathsPage := (
    (pageID = CustomPathsPage.ID)
    and (InstallerState <> Initialized)
    and not ShouldSpecifyCustomPluginsDirpath());

  Result := (
    isInstallerStarted
    or isInstallerStartedWithGimpNotDetected
    or shouldSkipCustomPathsPage);
end;

procedure CurPageChanged(curPageID: Integer);
begin
  CustomizeButton.visible := (curPageID = wpReady) and IsGimpDetected;

  if (curPageID = CustomPathsPage.ID) and not IsGimpDetected then begin
    WizardForm.BackButton.visible := False;
  end;

  if curPageID = wpReady then begin
    InstallerState := ReadyToInstall;

    // Assign correct value to `DefaultDirName` (it may be empty or incorrect at this point).
    WizardForm.DirEdit.Text := PluginsDirpath;
  end;
end;

procedure AddCustomizeToInstallPage;
begin
  CustomizeButton := TNewButton.Create(WizardForm);

  with CustomizeButton do begin
    Caption := 'Customize';
    Parent := WizardForm;
    Width := GetButtonWidthFitToCaption(Caption, 12);
    Height := WizardForm.NextButton.Height;
    Left := WizardForm.ClientWidth - (WizardForm.CancelButton.Left + WizardForm.CancelButton.Width);
    Top := WizardForm.NextButton.Top;

    OnClick := @OnCustomizeClicked;
  end;
end;

procedure OnCustomizeClicked(sender: TObject);
var
  i: Integer;
begin
  for i := 0 to NUM_CUSTOM_PAGES - 1 do begin
    WizardForm.BackButton.OnClick(TNewButton(sender).Parent);
  end;
end;

function GetButtonWidthFitToCaption(const caption: String; const xSpacing: Integer) : Integer;
var
  dummyLabel: TNewStaticText;
  defaultWidth: Integer;
begin
  dummyLabel := TNewStaticText.Create(WizardForm);

  dummyLabel.Autosize := True;
  dummyLabel.Caption := caption;

  defaultWidth := WizardForm.NextButton.Width;

  if defaultWidth >= dummyLabel.Width + ScaleX(xSpacing) then begin
    Result := defaultWidth;
  end
  else begin
    Result := dummyLabel.Width + ScaleX(xSpacing);
  end;

  dummyLabel.Free;
end;

procedure CreateSelectPluginInstallPathPage(const afterID: Integer);
begin
  SelectPluginInstallPathPage := CreateInputOptionPage(
    afterID,
    'Select Installation Path',
    'Where should {#PLUGIN_TITLE} be installed?',
    'Select one of the options below:',
    True,
    False
  );

  SelectPluginInstallPathPage.Add('Install for just me');
  SelectPluginInstallPathPage.Add(
    'Install for all users');
  SelectPluginInstallPathPage.Add('Choose custom installation path');

  SelectPluginInstallPathPage.Values[0] := True;
end;

procedure CreateCustomPathsPage(const afterID: Integer);
var
  lastAddedDirIndex: Integer;
begin
  CustomPathsPage := CreateInputDirPage(
    afterID,
    'Select Location for GIMP and GIMP Plug-ins',
    'Where is GIMP located and where should {#PLUGIN_TITLE} be installed?',
    'Specify custom directory path to a working GIMP installation and to GIMP plug-ins.',
    False,
    'New Folder');

  lastAddedDirIndex := CustomPathsPage.Add('Path to GIMP installation');
  GimpDirpathEdit := CustomPathsPage.Edits[lastAddedDirIndex];
  CustomPathsPage.Values[0] := GimpDirpath;

  lastAddedDirIndex := CustomPathsPage.Add('Path to GIMP plug-ins');
  PluginsDirpathEdit := CustomPathsPage.Edits[lastAddedDirIndex];
  CustomPathsPage.Values[1] := PluginsDirpath;
end;

function ShouldSpecifyCustomPluginsDirpath : Boolean;
begin
  Result := SelectPluginInstallPathPage.values[2];
end;

procedure CheckPythonScriptingEnabled;
var
  possiblePythonDirpaths: TStringList;
  i: Integer;
  pythonPathFound: Boolean;
begin
  pythonPathFound := False;

  possiblePythonDirpaths := TStringList.Create;
  possiblePythonDirpaths.Add(GimpDirpath + '\Python');
  possiblePythonDirpaths.Add(GimpDirpath + '\32\lib\python2.7');
  possiblePythonDirpaths.Add(GimpDirpath + '\lib\python2.7');

  for i := 0 to possiblePythonDirpaths.Count - 1 do begin
    if DirExists(possiblePythonDirpaths[i]) then begin
      pythonPathFound := True;
      break;
    end;
  end;

  possiblePythonDirpaths.Free;

  if not pythonPathFound then begin
    MsgBox(PYTHON_NOT_FOUND_IN_GIMP_MESSAGE, mbInformation, MB_OK);
    Abort();
  end;
end;

function GetLocalPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String;
var
  gimpVersionMajorMinorStr: String;
begin
  gimpVersionMajorMinorStr := GetGimpVersionStr(gimpVersionMajorMinor);

  if (gimpVersionMajorMinor[0] <= 2) and (gimpVersionMajorMinor[1] < 9) then begin
    Result := ExpandConstant('{%USERPROFILE}') + '\.gimp-' + gimpVersionMajorMinorStr + '\plug-ins';
  end
  else begin
    Result := ExpandConstant('{userappdata}') + '\GIMP\' + gimpVersionMajorMinorStr + '\plug-ins';
  end;
end;

function GetSystemPluginsDirpath(const gimpVersionMajorMinor: TVersionArray) : String;
begin
  Result := GimpDirpath + '\lib\gimp\' + IntToStr(gimpVersionMajorMinor[0]) + '.0\plug-ins';
end;

function GetGimpVersionMajorMinor(const gimpVersion: String) : TVersionArray;
var
  versionNumberMajorMinor: TVersionArray;
  i: Integer;
  versionNumberFields: array of Integer;
  versionNumberFieldCurrentArrayIndex: Integer;
  versionNumberFieldStartIndex: Integer;
begin
  versionNumberFieldCurrentArrayIndex := 0;
  versionNumberFieldStartIndex := 1;

  for i := 1 to Length(gimpVersion) do begin
    if gimpVersion[i] = '.' then begin
      SetArrayLength(versionNumberFields, GetArrayLength(versionNumberFields) + 1);
      versionNumberFields[versionNumberFieldCurrentArrayIndex] := (
        StrToIntDef(
          Copy(
            gimpVersion, versionNumberFieldStartIndex, i - versionNumberFieldStartIndex), -1));
      versionNumberFieldCurrentArrayIndex := versionNumberFieldCurrentArrayIndex + 1;
      versionNumberFieldStartIndex := i + 1;
    end;
  end;

  if versionNumberFieldStartIndex <= Length(gimpVersion) then begin
    SetArrayLength(versionNumberFields, GetArrayLength(versionNumberFields) + 1);
    versionNumberFields[versionNumberFieldCurrentArrayIndex] := (
      StrToIntDef(
        Copy(
          gimpVersion, versionNumberFieldStartIndex, Length(gimpVersion) + 1 - versionNumberFieldStartIndex), -1));
  end;

  versionNumberMajorMinor[0] := versionNumberFields[0];
  versionNumberMajorMinor[1] := versionNumberFields[1];

  Result := versionNumberMajorMinor;
end;

function GetGimpVersionStr(const gimpVersionArray: array of Integer) : String;
var
  i: Integer;
  gimpVersionStr: String;
begin
  gimpVersionStr := '';

  for i := 0 to Length(gimpVersionArray) - 1 do begin
    gimpVersionStr := gimpVersionStr + IntToStr(gimpVersionArray[i]) + '.';
  end;

  Result := Copy(gimpVersionStr, 1, Length(gimpVersionStr) - 1);
end;