prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  MSI installed meson fails to rerun in visual studio
  Initially, I ran `meson build` from the source code directory `xxx` to create the build directory.
  Later, if any `meson.build` files are modified, Visual studio fails to rerun Meson with the backtrace below. Meson is installed with MSI. It works with ninja as backend. It also works if meson isn't installed with MSI.
  
  It seems like `mesonscript` in `regen_checker` is invalid when meson is installed with MSI.
  
  ```
  >meson.exe : error : unrecognized arguments: --internal regenerate C:\Users\niklas\Documents\git\xxx C:\Users\niklas\Documents\git\xxx
  1>  Traceback (most recent call last):
  1>    File "C:\Users\niklas\AppData\Local\Programs\Python\Python36-32\lib\site-packages\cx_Freeze\initscripts\__startup__.py", line 14, in run
  1>      module.run()
  1>    File "C:\Users\niklas\AppData\Local\Programs\Python\Python36-32\lib\site-packages\cx_Freeze\initscripts\Console.py", line 26, in run
  1>      exec(code, m.__dict__)
  1>    File "meson.py", line 37, in <module>
  1>    File "meson.py", line 34, in main
  1>    File "mesonbuild\mesonmain.py", line 311, in run
  1>    File "mesonbuild\mesonmain.py", line 278, in run_script_command
  1>    File "mesonbuild\scripts\regen_checker.py", line 56, in run
  1>    File "mesonbuild\scripts\regen_checker.py", line 42, in regen
  1>    File "C:\Users\niklas\AppData\Local\Programs\Python\Python36-32\lib\subprocess.py", line 291, in check_call
  1>      raise CalledProcessError(retcode, cmd)
  1>  subprocess.CalledProcessError: Command '['C:\\Program Files\\Meson\\meson.exe', 'C:\\Users\\niklas\\Documents\\git\\xxx\\meson', '--internal', 'regenerate', 'C:\\Users\\niklas\\Documents\\git\\xxx\\build', 'C:\\Users\\niklas\\Documents\\git\\xxx', '--backend=vs2015']' returned non-zero exit status 2.
  ```
  
  </issue>
  <code>
  [start of mesonbuild/scripts/regen_checker.py]
  1 # Copyright 2015-2016 The Meson development team
  2 
  3 # Licensed under the Apache License, Version 2.0 (the "License");
  4 # you may not use this file except in compliance with the License.
  5 # You may obtain a copy of the License at
  6 
  7 #     http://www.apache.org/licenses/LICENSE-2.0
  8 
  9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14 
  15 import sys, os
  16 import pickle, subprocess
  17 
  18 # This could also be used for XCode.
  19 
  20 def need_regen(regeninfo, regen_timestamp):
  21     for i in regeninfo.depfiles:
  22         curfile = os.path.join(regeninfo.build_dir, i)
  23         curtime = os.stat(curfile).st_mtime
  24         if curtime > regen_timestamp:
  25             return True
  26     # The timestamp file gets automatically deleted by MSBuild during a 'Clean' build.
  27     # We must make sure to recreate it, even if we do not regenerate the solution.
  28     # Otherwise, Visual Studio will always consider the REGEN project out of date.
  29     print("Everything is up-to-date, regeneration of build files is not needed.")
  30     from ..backend.vs2010backend import Vs2010Backend
  31     Vs2010Backend.touch_regen_timestamp(regeninfo.build_dir)
  32     return False
  33 
  34 def regen(regeninfo, mesonscript, backend):
  35     cmd = [sys.executable,
  36            mesonscript,
  37            '--internal',
  38            'regenerate',
  39            regeninfo.build_dir,
  40            regeninfo.source_dir,
  41            '--backend=' + backend]
  42     subprocess.check_call(cmd)
  43 
  44 def run(args):
  45     private_dir = args[0]
  46     dumpfile = os.path.join(private_dir, 'regeninfo.dump')
  47     coredata = os.path.join(private_dir, 'coredata.dat')
  48     with open(dumpfile, 'rb') as f:
  49         regeninfo = pickle.load(f)
  50     with open(coredata, 'rb') as f:
  51         coredata = pickle.load(f)
  52     mesonscript = coredata.meson_script_launcher
  53     backend = coredata.get_builtin_option('backend')
  54     regen_timestamp = os.stat(dumpfile).st_mtime
  55     if need_regen(regeninfo, regen_timestamp):
  56         regen(regeninfo, mesonscript, backend)
  57     sys.exit(0)
  58 
  59 if __name__ == '__main__':
  60     run(sys.argv[1:])
  61
  [end of mesonbuild/scripts/regen_checker.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/mesonbuild/scripts/regen_checker.py b/mesonbuild/scripts/regen_checker.py
  --- a/mesonbuild/scripts/regen_checker.py
  +++ b/mesonbuild/scripts/regen_checker.py
  @@ -32,9 +32,11 @@
       return False
   
   def regen(regeninfo, mesonscript, backend):
  -    cmd = [sys.executable,
  -           mesonscript,
  -           '--internal',
  +    if sys.executable.lower().endswith('meson.exe'):
  +        cmd_exe = [sys.executable]
  +    else:
  +        cmd_exe = [sys.executable, mesonscript]
  +    cmd = cmd_exe + ['--internal',
              'regenerate',
              regeninfo.build_dir,
              regeninfo.source_dir,
  
verification_info: {"golden_diff": "diff --git a/mesonbuild/scripts/regen_checker.py b/mesonbuild/scripts/regen_checker.py\n--- a/mesonbuild/scripts/regen_checker.py\n+++ b/mesonbuild/scripts/regen_checker.py\n@@ -32,9 +32,11 @@\n     return False\n \n def regen(regeninfo, mesonscript, backend):\n-    cmd = [sys.executable,\n-           mesonscript,\n-           '--internal',\n+    if sys.executable.lower().endswith('meson.exe'):\n+        cmd_exe = [sys.executable]\n+    else:\n+        cmd_exe = [sys.executable, mesonscript]\n+    cmd = cmd_exe + ['--internal',\n            'regenerate',\n            regeninfo.build_dir,\n            regeninfo.source_dir,\n", "issue": "MSI installed meson fails to rerun in visual studio\nInitially, I ran `meson build` from the source code directory `xxx` to create the build directory.\r\nLater, if any `meson.build` files are modified, Visual studio fails to rerun Meson with the backtrace below. Meson is installed with MSI. It works with ninja as backend. It also works if meson isn't installed with MSI.\r\n\r\nIt seems like `mesonscript` in `regen_checker` is invalid when meson is installed with MSI.\r\n\r\n```\r\n>meson.exe : error : unrecognized arguments: --internal regenerate C:\\Users\\niklas\\Documents\\git\\xxx C:\\Users\\niklas\\Documents\\git\\xxx\r\n1>  Traceback (most recent call last):\r\n1>    File \"C:\\Users\\niklas\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\cx_Freeze\\initscripts\\__startup__.py\", line 14, in run\r\n1>      module.run()\r\n1>    File \"C:\\Users\\niklas\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\cx_Freeze\\initscripts\\Console.py\", line 26, in run\r\n1>      exec(code, m.__dict__)\r\n1>    File \"meson.py\", line 37, in <module>\r\n1>    File \"meson.py\", line 34, in main\r\n1>    File \"mesonbuild\\mesonmain.py\", line 311, in run\r\n1>    File \"mesonbuild\\mesonmain.py\", line 278, in run_script_command\r\n1>    File \"mesonbuild\\scripts\\regen_checker.py\", line 56, in run\r\n1>    File \"mesonbuild\\scripts\\regen_checker.py\", line 42, in regen\r\n1>    File \"C:\\Users\\niklas\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\subprocess.py\", line 291, in check_call\r\n1>      raise CalledProcessError(retcode, cmd)\r\n1>  subprocess.CalledProcessError: Command '['C:\\\\Program Files\\\\Meson\\\\meson.exe', 'C:\\\\Users\\\\niklas\\\\Documents\\\\git\\\\xxx\\\\meson', '--internal', 'regenerate', 'C:\\\\Users\\\\niklas\\\\Documents\\\\git\\\\xxx\\\\build', 'C:\\\\Users\\\\niklas\\\\Documents\\\\git\\\\xxx', '--backend=vs2015']' returned non-zero exit status 2.\r\n```\n", "before_files": [{"content": "# Copyright 2015-2016 The Meson development team\n\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n\n#     http://www.apache.org/licenses/LICENSE-2.0\n\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport sys, os\nimport pickle, subprocess\n\n# This could also be used for XCode.\n\ndef need_regen(regeninfo, regen_timestamp):\n    for i in regeninfo.depfiles:\n        curfile = os.path.join(regeninfo.build_dir, i)\n        curtime = os.stat(curfile).st_mtime\n        if curtime > regen_timestamp:\n            return True\n    # The timestamp file gets automatically deleted by MSBuild during a 'Clean' build.\n    # We must make sure to recreate it, even if we do not regenerate the solution.\n    # Otherwise, Visual Studio will always consider the REGEN project out of date.\n    print(\"Everything is up-to-date, regeneration of build files is not needed.\")\n    from ..backend.vs2010backend import Vs2010Backend\n    Vs2010Backend.touch_regen_timestamp(regeninfo.build_dir)\n    return False\n\ndef regen(regeninfo, mesonscript, backend):\n    cmd = [sys.executable,\n           mesonscript,\n           '--internal',\n           'regenerate',\n           regeninfo.build_dir,\n           regeninfo.source_dir,\n           '--backend=' + backend]\n    subprocess.check_call(cmd)\n\ndef run(args):\n    private_dir = args[0]\n    dumpfile = os.path.join(private_dir, 'regeninfo.dump')\n    coredata = os.path.join(private_dir, 'coredata.dat')\n    with open(dumpfile, 'rb') as f:\n        regeninfo = pickle.load(f)\n    with open(coredata, 'rb') as f:\n        coredata = pickle.load(f)\n    mesonscript = coredata.meson_script_launcher\n    backend = coredata.get_builtin_option('backend')\n    regen_timestamp = os.stat(dumpfile).st_mtime\n    if need_regen(regeninfo, regen_timestamp):\n        regen(regeninfo, mesonscript, backend)\n    sys.exit(0)\n\nif __name__ == '__main__':\n    run(sys.argv[1:])\n", "path": "mesonbuild/scripts/regen_checker.py"}]}