  @author   <  >
  @copyright 2010 Mochi Media , Inc.
%%
%% Permission is hereby granted, free of charge, to any person obtaining a
%% copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction , including without limitation
%% the rights to use, copy, modify, merge, publish, distribute, sublicense,
  and/or sell copies of the Software , and to permit persons to whom the
%% Software is furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software .
%%
  THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
%% THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE , ARISING
%% FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
%% DEALINGS IN THE SOFTWARE.

%% @doc Create temporary files and directories.

-module(mochitemp).

-ignore_xref([
    gettempdir/0,
    mkdtemp/0,
    mkdtemp/3,
    rmtempdir/1
]).
-export([
    gettempdir/0,
    mkdtemp/0,
    mkdtemp/3,
    rmtempdir/1
]).
%% -export([mkstemp/4]).
-define(SAFE_CHARS, {
    $a,
    $b,
    $c,
    $d,
    $e,
    $f,
    $g,
    $h,
    $i,
    $j,
    $k,
    $l,
    $m,
    $n,
    $o,
    $p,
    $q,
    $r,
    $s,
    $t,
    $u,
    $v,
    $w,
    $x,
    $y,
    $z,
    $A,
    $B,
    $C,
    $D,
    $E,
    $F,
    $G,
    $H,
    $I,
    $J,
    $K,
    $L,
    $M,
    $N,
    $O,
    $P,
    $Q,
    $R,
    $S,
    $T,
    $U,
    $V,
    $W,
    $X,
    $Y,
    $Z,
    $0,
    $1,
    $2,
    $3,
    $4,
    $5,
    $6,
    $7,
    $8,
    $9,
    $_
}).
-define(TMP_MAX, 10000).

-include_lib("kernel/include/file.hrl").

%% TODO: An ugly wrapper over the mktemp tool with open_port and sadness?
        We ca n't implement this race - free in Erlang without the ability
%%       to issue O_CREAT|O_EXCL. I suppose we could hack something with
%%       mkdtemp, del_dir, open.
  mkstemp(Suffix , Prefix ,  , Options ) - >
%%    ok.

rmtempdir(Dir) ->
    case file:del_dir(Dir) of
        {error, eexist} ->
            ok = rmtempdirfiles(Dir),
            ok = file:del_dir(Dir);
        ok ->
            ok
    end.

rmtempdirfiles(Dir) ->
    {ok, Files} = file:list_dir(Dir),
    ok = rmtempdirfiles(Dir, Files).

rmtempdirfiles(_Dir, []) ->
    ok;
rmtempdirfiles(Dir, [Basename | Rest]) ->
    Path = filename:join([Dir, Basename]),
    case filelib:is_dir(Path) of
        true ->
            ok = rmtempdir(Path);
        false ->
            ok = file:delete(Path)
    end,
    rmtempdirfiles(Dir, Rest).

mkdtemp() ->
    mkdtemp("", "tmp", gettempdir()).

mkdtemp(Suffix, Prefix, Dir) ->
    mkdtemp_n(rngpath_fun(Suffix, Prefix, Dir), ?TMP_MAX).

mkdtemp_n(RngPath, 1) ->
    make_dir(RngPath());
mkdtemp_n(RngPath, N) ->
    try
        make_dir(RngPath())
    catch
        throw:{error, eexist} ->
            mkdtemp_n(RngPath, N - 1)
    end.

make_dir(Path) ->
    case file:make_dir(Path) of
        ok ->
            ok;
        E = {error, eexist} ->
            throw(E)
    end,
  Small window for a race condition here because  is created 777
    ok = file:write_file_info(Path, #file_info{mode = 8#0700}),
    Path.

rngpath_fun(Prefix, Suffix, Dir) ->
    fun() ->
        filename:join([Dir, Prefix ++ rngchars(6) ++ Suffix])
    end.

rngchars(0) ->
    "";
rngchars(N) ->
    [rngchar() | rngchars(N - 1)].

rngchar() ->
    rngchar(rand:uniform(tuple_size(?SAFE_CHARS)) - 1).

rngchar(C) ->
    element(1 + C, ?SAFE_CHARS).

    ( ) - > string ( )
  @doc Get a usable temporary directory using the first of these that is a directory :
       $ TMPDIR ,   , $ TEMP , " /tmp " , " /var / tmp " , " /usr / tmp " , " . " .
gettempdir() ->
    gettempdir(gettempdir_checks(), fun normalize_dir/1).

gettempdir_checks() ->
    [
        {fun os:getenv/1, ["TMPDIR", "TMP", "TEMP"]},
        {fun gettempdir_identity/1, ["/tmp", "/var/tmp", "/usr/tmp"]},
        {fun gettempdir_cwd/1, [cwd]}
    ].

gettempdir_identity(L) ->
    L.

gettempdir_cwd(cwd) ->
    {ok, L} = file:get_cwd(),
    L.

gettempdir([{_F, []} | RestF], Normalize) ->
    gettempdir(RestF, Normalize);
gettempdir([{F, [L | RestL]} | RestF], Normalize) ->
    case Normalize(F(L)) of
        false ->
            gettempdir([{F, RestL} | RestF], Normalize);
        Dir ->
            Dir
    end.

normalize_dir(False) when False =:= false orelse False =:= "" ->
  Erlang does n't have an unsetenv , wtf .
    false;
normalize_dir(L) ->
    Dir = filename:absname(L),
    case filelib:is_dir(Dir) of
        false ->
            false;
        true ->
            Dir
    end.

%%
%% Tests
%%
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").

pushenv(L) ->
    [{K, os:getenv(K)} || K <- L].
popenv(L) ->
    F = fun
        ({K, false}) ->
  Erlang does n't have an unsetenv , wtf .
            os:putenv(K, "");
        ({K, V}) ->
            os:putenv(K, V)
    end,
    lists:foreach(F, L).

gettempdir_fallback_test() ->
    ?assertEqual(
        "/",
        gettempdir(
            [
                {fun gettempdir_identity/1, ["/--not-here--/"]},
                {fun gettempdir_identity/1, ["/"]}
            ],
            fun normalize_dir/1
        )
    ),
    ?assertEqual(
        "/",
  simulate a true os :  unset env
        gettempdir(
            [
                {fun gettempdir_identity/1, [false]},
                {fun gettempdir_identity/1, ["/"]}
            ],
            fun normalize_dir/1
        )
    ),
    ok.

gettempdir_identity_test() ->
    ?assertEqual(
        "/",
        gettempdir([{fun gettempdir_identity/1, ["/"]}], fun normalize_dir/1)
    ),
    ok.

gettempdir_cwd_test() ->
    {ok, Cwd} = file:get_cwd(),
    ?assertEqual(
        normalize_dir(Cwd),
        gettempdir([{fun gettempdir_cwd/1, [cwd]}], fun normalize_dir/1)
    ),
    ok.

rngchars_test() ->
    ?assertEqual(
        "",
        rngchars(0)
    ),
    ?assertEqual(
        10,
        length(rngchars(10))
    ),
    ok.

rngchar_test() ->
    ?assertEqual(
        $a,
        rngchar(0)
    ),
    ?assertEqual(
        $A,
        rngchar(26)
    ),
    ?assertEqual(
        $_,
        rngchar(62)
    ),
    ok.

mkdtemp_n_failonce_test() ->
    D = mkdtemp(),
    Path = filename:join([D, "testdir"]),
    %% Toggle the existence of a dir so that it fails
  the first time and succeeds the second .
    F = fun() ->
        case filelib:is_dir(Path) of
            true ->
                file:del_dir(Path);
            false ->
                file:make_dir(Path)
        end,
        Path
    end,
    try
  Fails the first time
        ?assertThrow(
            {error, eexist},
            mkdtemp_n(F, 1)
        ),
        %% Reset state
        file:del_dir(Path),
  Succeeds the second time
        ?assertEqual(
            Path,
            mkdtemp_n(F, 2)
        )
    after
        rmtempdir(D)
    end,
    ok.

mkdtemp_n_fail_test() ->
    {ok, Cwd} = file:get_cwd(),
    ?assertThrow(
        {error, eexist},
        mkdtemp_n(fun() -> Cwd end, 1)
    ),
    ?assertThrow(
        {error, eexist},
        mkdtemp_n(fun() -> Cwd end, 2)
    ),
    ok.

make_dir_fail_test() ->
    {ok, Cwd} = file:get_cwd(),
    ?assertThrow(
        {error, eexist},
        make_dir(Cwd)
    ),
    ok.

mkdtemp_test() ->
    D = mkdtemp(),
    ?assertEqual(
        true,
        filelib:is_dir(D)
    ),
    ?assertEqual(
        ok,
        file:del_dir(D)
    ),
    ok.

rmtempdir_test() ->
    D1 = mkdtemp(),
    ?assertEqual(
        true,
        filelib:is_dir(D1)
    ),
    ?assertEqual(
        ok,
        rmtempdir(D1)
    ),
    D2 = mkdtemp(),
    ?assertEqual(
        true,
        filelib:is_dir(D2)
    ),
    ok = file:write_file(filename:join([D2, "foo"]), <<"bytes">>),
    D3 = mkdtemp("suffix", "prefix", D2),
    ?assertEqual(
        true,
        filelib:is_dir(D3)
    ),
    ok = file:write_file(filename:join([D3, "foo"]), <<"bytes">>),
    ?assertEqual(
        ok,
        rmtempdir(D2)
    ),
    ?assertEqual(
        {error, enoent},
        file:consult(D3)
    ),
    ?assertEqual(
        {error, enoent},
        file:consult(D2)
    ),
    ok.

gettempdir_env_test() ->
    Env = pushenv(["TMPDIR", "TEMP", "TMP"]),
    FalseEnv = [{"TMPDIR", false}, {"TEMP", false}, {"TMP", false}],
    try
        popenv(FalseEnv),
        popenv([{"TMPDIR", "/"}]),
        ?assertEqual(
            "/",
            os:getenv("TMPDIR")
        ),
        ?assertEqual(
            "/",
            gettempdir()
        ),
        {ok, Cwd} = file:get_cwd(),
        popenv(FalseEnv),
        popenv([{"TMP", Cwd}]),
        ?assertEqual(
            normalize_dir(Cwd),
            gettempdir()
        )
    after
        popenv(Env)
    end,
    ok.

-endif.


 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in

 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.
 @doc Create temporary files and directories.
 -export([mkstemp/4]).
 TODO: An ugly wrapper over the mktemp tool with open_port and sadness?
       to issue O_CREAT|O_EXCL. I suppose we could hack something with
       mkdtemp, del_dir, open.
    ok.

 Tests

 Toggle the existence of a dir so that it fails
 Reset state
  @author   <  >
  @copyright 2010 Mochi Media , Inc.
  to deal in the Software without restriction , including without limitation
  and/or sell copies of the Software , and to permit persons to whom the
  all copies or substantial portions of the Software .
  THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
  LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE , ARISING


-module(mochitemp).

-ignore_xref([
    gettempdir/0,
    mkdtemp/0,
    mkdtemp/3,
    rmtempdir/1
]).
-export([
    gettempdir/0,
    mkdtemp/0,
    mkdtemp/3,
    rmtempdir/1
]).
-define(SAFE_CHARS, {
    $a,
    $b,
    $c,
    $d,
    $e,
    $f,
    $g,
    $h,
    $i,
    $j,
    $k,
    $l,
    $m,
    $n,
    $o,
    $p,
    $q,
    $r,
    $s,
    $t,
    $u,
    $v,
    $w,
    $x,
    $y,
    $z,
    $A,
    $B,
    $C,
    $D,
    $E,
    $F,
    $G,
    $H,
    $I,
    $J,
    $K,
    $L,
    $M,
    $N,
    $O,
    $P,
    $Q,
    $R,
    $S,
    $T,
    $U,
    $V,
    $W,
    $X,
    $Y,
    $Z,
    $0,
    $1,
    $2,
    $3,
    $4,
    $5,
    $6,
    $7,
    $8,
    $9,
    $_
}).
-define(TMP_MAX, 10000).

-include_lib("kernel/include/file.hrl").

        We ca n't implement this race - free in Erlang without the ability
  mkstemp(Suffix , Prefix ,  , Options ) - >

rmtempdir(Dir) ->
    case file:del_dir(Dir) of
        {error, eexist} ->
            ok = rmtempdirfiles(Dir),
            ok = file:del_dir(Dir);
        ok ->
            ok
    end.

rmtempdirfiles(Dir) ->
    {ok, Files} = file:list_dir(Dir),
    ok = rmtempdirfiles(Dir, Files).

rmtempdirfiles(_Dir, []) ->
    ok;
rmtempdirfiles(Dir, [Basename | Rest]) ->
    Path = filename:join([Dir, Basename]),
    case filelib:is_dir(Path) of
        true ->
            ok = rmtempdir(Path);
        false ->
            ok = file:delete(Path)
    end,
    rmtempdirfiles(Dir, Rest).

mkdtemp() ->
    mkdtemp("", "tmp", gettempdir()).

mkdtemp(Suffix, Prefix, Dir) ->
    mkdtemp_n(rngpath_fun(Suffix, Prefix, Dir), ?TMP_MAX).

mkdtemp_n(RngPath, 1) ->
    make_dir(RngPath());
mkdtemp_n(RngPath, N) ->
    try
        make_dir(RngPath())
    catch
        throw:{error, eexist} ->
            mkdtemp_n(RngPath, N - 1)
    end.

make_dir(Path) ->
    case file:make_dir(Path) of
        ok ->
            ok;
        E = {error, eexist} ->
            throw(E)
    end,
  Small window for a race condition here because  is created 777
    ok = file:write_file_info(Path, #file_info{mode = 8#0700}),
    Path.

rngpath_fun(Prefix, Suffix, Dir) ->
    fun() ->
        filename:join([Dir, Prefix ++ rngchars(6) ++ Suffix])
    end.

rngchars(0) ->
    "";
rngchars(N) ->
    [rngchar() | rngchars(N - 1)].

rngchar() ->
    rngchar(rand:uniform(tuple_size(?SAFE_CHARS)) - 1).

rngchar(C) ->
    element(1 + C, ?SAFE_CHARS).

    ( ) - > string ( )
  @doc Get a usable temporary directory using the first of these that is a directory :
       $ TMPDIR ,   , $ TEMP , " /tmp " , " /var / tmp " , " /usr / tmp " , " . " .
gettempdir() ->
    gettempdir(gettempdir_checks(), fun normalize_dir/1).

gettempdir_checks() ->
    [
        {fun os:getenv/1, ["TMPDIR", "TMP", "TEMP"]},
        {fun gettempdir_identity/1, ["/tmp", "/var/tmp", "/usr/tmp"]},
        {fun gettempdir_cwd/1, [cwd]}
    ].

gettempdir_identity(L) ->
    L.

gettempdir_cwd(cwd) ->
    {ok, L} = file:get_cwd(),
    L.

gettempdir([{_F, []} | RestF], Normalize) ->
    gettempdir(RestF, Normalize);
gettempdir([{F, [L | RestL]} | RestF], Normalize) ->
    case Normalize(F(L)) of
        false ->
            gettempdir([{F, RestL} | RestF], Normalize);
        Dir ->
            Dir
    end.

normalize_dir(False) when False =:= false orelse False =:= "" ->
  Erlang does n't have an unsetenv , wtf .
    false;
normalize_dir(L) ->
    Dir = filename:absname(L),
    case filelib:is_dir(Dir) of
        false ->
            false;
        true ->
            Dir
    end.

-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").

pushenv(L) ->
    [{K, os:getenv(K)} || K <- L].
popenv(L) ->
    F = fun
        ({K, false}) ->
  Erlang does n't have an unsetenv , wtf .
            os:putenv(K, "");
        ({K, V}) ->
            os:putenv(K, V)
    end,
    lists:foreach(F, L).

gettempdir_fallback_test() ->
    ?assertEqual(
        "/",
        gettempdir(
            [
                {fun gettempdir_identity/1, ["/--not-here--/"]},
                {fun gettempdir_identity/1, ["/"]}
            ],
            fun normalize_dir/1
        )
    ),
    ?assertEqual(
        "/",
  simulate a true os :  unset env
        gettempdir(
            [
                {fun gettempdir_identity/1, [false]},
                {fun gettempdir_identity/1, ["/"]}
            ],
            fun normalize_dir/1
        )
    ),
    ok.

gettempdir_identity_test() ->
    ?assertEqual(
        "/",
        gettempdir([{fun gettempdir_identity/1, ["/"]}], fun normalize_dir/1)
    ),
    ok.

gettempdir_cwd_test() ->
    {ok, Cwd} = file:get_cwd(),
    ?assertEqual(
        normalize_dir(Cwd),
        gettempdir([{fun gettempdir_cwd/1, [cwd]}], fun normalize_dir/1)
    ),
    ok.

rngchars_test() ->
    ?assertEqual(
        "",
        rngchars(0)
    ),
    ?assertEqual(
        10,
        length(rngchars(10))
    ),
    ok.

rngchar_test() ->
    ?assertEqual(
        $a,
        rngchar(0)
    ),
    ?assertEqual(
        $A,
        rngchar(26)
    ),
    ?assertEqual(
        $_,
        rngchar(62)
    ),
    ok.

mkdtemp_n_failonce_test() ->
    D = mkdtemp(),
    Path = filename:join([D, "testdir"]),
  the first time and succeeds the second .
    F = fun() ->
        case filelib:is_dir(Path) of
            true ->
                file:del_dir(Path);
            false ->
                file:make_dir(Path)
        end,
        Path
    end,
    try
  Fails the first time
        ?assertThrow(
            {error, eexist},
            mkdtemp_n(F, 1)
        ),
        file:del_dir(Path),
  Succeeds the second time
        ?assertEqual(
            Path,
            mkdtemp_n(F, 2)
        )
    after
        rmtempdir(D)
    end,
    ok.

mkdtemp_n_fail_test() ->
    {ok, Cwd} = file:get_cwd(),
    ?assertThrow(
        {error, eexist},
        mkdtemp_n(fun() -> Cwd end, 1)
    ),
    ?assertThrow(
        {error, eexist},
        mkdtemp_n(fun() -> Cwd end, 2)
    ),
    ok.

make_dir_fail_test() ->
    {ok, Cwd} = file:get_cwd(),
    ?assertThrow(
        {error, eexist},
        make_dir(Cwd)
    ),
    ok.

mkdtemp_test() ->
    D = mkdtemp(),
    ?assertEqual(
        true,
        filelib:is_dir(D)
    ),
    ?assertEqual(
        ok,
        file:del_dir(D)
    ),
    ok.

rmtempdir_test() ->
    D1 = mkdtemp(),
    ?assertEqual(
        true,
        filelib:is_dir(D1)
    ),
    ?assertEqual(
        ok,
        rmtempdir(D1)
    ),
    D2 = mkdtemp(),
    ?assertEqual(
        true,
        filelib:is_dir(D2)
    ),
    ok = file:write_file(filename:join([D2, "foo"]), <<"bytes">>),
    D3 = mkdtemp("suffix", "prefix", D2),
    ?assertEqual(
        true,
        filelib:is_dir(D3)
    ),
    ok = file:write_file(filename:join([D3, "foo"]), <<"bytes">>),
    ?assertEqual(
        ok,
        rmtempdir(D2)
    ),
    ?assertEqual(
        {error, enoent},
        file:consult(D3)
    ),
    ?assertEqual(
        {error, enoent},
        file:consult(D2)
    ),
    ok.

gettempdir_env_test() ->
    Env = pushenv(["TMPDIR", "TEMP", "TMP"]),
    FalseEnv = [{"TMPDIR", false}, {"TEMP", false}, {"TMP", false}],
    try
        popenv(FalseEnv),
        popenv([{"TMPDIR", "/"}]),
        ?assertEqual(
            "/",
            os:getenv("TMPDIR")
        ),
        ?assertEqual(
            "/",
            gettempdir()
        ),
        {ok, Cwd} = file:get_cwd(),
        popenv(FalseEnv),
        popenv([{"TMP", Cwd}]),
        ?assertEqual(
            normalize_dir(Cwd),
            gettempdir()
        )
    after
        popenv(Env)
    end,
    ok.

-endif.
