Feature prepare environment script

env.py

@@ -0,0 +1,105 @@
+import argparse
+import glob
+import os
+import sys
+import textwrap
+import subprocess
+
+
+def ensure_dir(path):
+    if os.path.exists(path):
+        return
+
+    os.mkdir(path)
+    return path
+
+
+def traverse_toolsets(f):
+    msbuild_dir = r'C:\Program Files (x86)\MSBuild'
+    toolsets = glob.glob(r'{}\Microsoft.Cpp\v4.0\*\Platforms\*\PlatformToolsets\*'.format(msbuild_dir))
+    for toolset in toolsets:
+        f(toolset)
+
+
+def clcache_props_path(toolset):
+    return os.path.join(toolset, 'ImportAfter', 'Clcache.props')
+
+
+def generate_props_content(exe):
+    return textwrap.dedent('''
+        <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+          <PropertyGroup>
+            <ClToolExe>{exe}</ClToolExe>
+            <ClToolPath>{dir}</ClToolPath>
+          </PropertyGroup>
+        </Project>''').format(
+            exe=os.path.basename(exe),
+            dir=os.path.dirname(exe))[1:]
+
+
+def check_call_quiet(*args, **kwargs):
+    with open(os.devnull, 'w') as devnull:
+        kwargs['stderr'] = devnull
+        kwargs['stdout'] = devnull
+        subprocess.check_call(*args, **kwargs)
+
+
+def set_system_variable(var, value):
+    if value:
+        check_call_quiet(['setx', var, value])
+    else:
+        reg_path = r'HKEY_CURRENT_USER\Environment'
+        try:
+            check_call_quiet(['reg', 'query', reg_path, '/V', var])
+        except subprocess.CalledProcessError:
+            # Variable doesn't exists
+            pass
+        else:
+            check_call_quiet(['reg', 'delete', reg_path, '/F', '/V', var])
+
+
+def install(exe, cache_dir):
+    def f(toolset):
+        clcache_props = clcache_props_path(toolset)
+        ensure_dir(os.path.dirname(clcache_props))
+        with open(clcache_props, 'w') as f:
+            f.write(generate_props_content(exe))
+
+    traverse_toolsets(f)
+    set_system_variable('CLCACHE_DIR', cache_dir)
+
+
+def uninstall():
+    def f(toolset):
+        clcache_props = clcache_props_path(toolset)
+        if os.path.exists(clcache_props):
+            os.remove(clcache_props)
+
+    traverse_toolsets(f)
+    set_system_variable('CLCACHE_DIR', None)
+
+
+def main(args=sys.argv[1:]):
+    clcache_default_exe = os.path.join(
+        os.path.dirname(os.path.abspath(__file__)),
+        'dist',
+        'clcache.exe')
+
+    parser = argparse.ArgumentParser()
+    subparsers = parser.add_subparsers(dest='action')
+    parser_install = subparsers.add_parser('install')
+    parser_install.add_argument('--exe', type=argparse.FileType('r'), default=clcache_default_exe)
+    parser_install.add_argument('--cache-dir')
+    parser_uninstall = subparsers.add_parser('uninstall')
+    args = parser.parse_args(args)
+
+    if args.action == 'install':
+        exe = os.path.abspath(args.exe.name)
+        cache_dir = os.path.abspath(args.cache_dir) if args.cache_dir else None
+        install(exe, cache_dir)
+    else:
+        uninstall()
+
+
+if __name__ == '__main__':
+    sys.exit(main())