swc-installation-test-2.py: Use ProgramFiles environment variable

On Fri, Apr 26, 2013 at 11:45:12AM -0700, Onno Broekmans wrote:
> ... the installation paths you mention are incorrect for the
> majority of modern Windows 7 installations. These are 64-bit
> installations, and they have a special folder for 32-bit programs:
> "C:\Program Files (x86)". So Notepad++ can be found in:
>
>     C:\Program Files (x86)\Notepad++\notepad++.exe
>
> In the script, you could just check for the program's existence
> using both paths ("C:\Program Files" _and_ "C:\Program Files
> (x86)"), or you could use the "ProgramFiles" environment variable.

Environment variable it is!  From the Microsoft docs [1]:

  CSIDL_PROGRAM_FILESX86
    The Program Files folder on 64-bit systems. A typical path is
    C:\Program Files(86).
  ...
  CSIDL_PROGRAM_FILES
    Version 5.0. The Program Files folder. A typical path is
    C:\Program Files.
  ...
  PROGRAMFILES
    Same as CSIDL_PROGRAM_FILES.
  PROGRAMFILES(X86)
    Refers to the C:\Program Files (x86) folder on 64-bit systems.

We're just looking for executables, so it would be ok if we found a
32-bit Notepad++ or a 64-bit Notepad++.  With this commit, we check
both locations (if there are two distinct locations).

[1]: http://technet.microsoft.com/en-us/library/cc749104%28v=ws.10%29.aspx

setup/swc-installation-test-2.py

@@ -483,6 +483,16 @@ def _get_version(self):
         return match.group(1)
 
 
+def _program_files_paths(*args):
+    "Utility for generating MS Windows search paths"
+    pf = _os.environ.get('ProgramFiles', '/usr/bin')
+    pfx86 = _os.environ.get('ProgramFiles(x86)', pf)
+    paths = [_os.path.join(pf, *args)]
+    if pfx86 != pf:
+        paths.append(_os.path.join(pfx86, *args))
+    return paths
+
+
 for command,long_name,minimum_version,paths in [
         ('sh', 'Bourne Shell', None, None),
         ('ash', 'Almquist Shell', None, None),
@@ -506,19 +516,13 @@ def _get_version(self):
         ('nano', 'Nano', None, None),
         ('gedit', None, None, None),
         ('kate', 'Kate', None, None),
-        ('notepad++', 'Notepad++', None, [
-            _os.path.join(
-                _ROOT_PATH, 'Program Files', 'Notepad++', 'notepad++.exe'),
-            ]),
-        ('firefox', 'Firefox', None, [
-            _os.path.join(
-                _ROOT_PATH, 'Program Files', 'Mozilla Firefox', 'firefox.exe'),
-            ]),
-        ('google-chrome', 'Google Chrome', None, [
-            _os.path.join(
-                _ROOT_PATH, 'Program Files', 'Google', 'Chrome', 'Application',
-                'chrome.exe'),
-            ]),
+        ('notepad++', 'Notepad++', None,
+         _program_files_paths('Notepad++', 'notepad++.exe')),
+        ('firefox', 'Firefox', None,
+         _program_files_paths('Mozilla Firefox', 'firefox.exe')),
+        ('google-chrome', 'Google Chrome', None,
+         _program_files_paths('Google', 'Chrome', 'Application', 'chrome.exe')
+         ),
         ('chromium', 'Chromium', None, None),
         ]:
     if not long_name: