Re: [StGit PATCH 9/9] Use the default git colouring scheme rather than specific scripts

That's probably a better option. I changed the patch to this (only
showing the relevant parts):

--- a/stgit/commands/common.py
+++ b/stgit/commands/common.py

@@ -97,6 +97,15 @@ def git_commit(name, repository, branch_name = None):
     except libgit.RepositoryException:
         raise CmdException('%s: Unknown patch or revision name' % name)

+def color_diff_flags():
+    """Return the git flags for coloured diff output if the configuration and
+    stdout allows."""
+    stdout_is_tty = (sys.stdout.isatty() and 'true') or 'false'
+    if config.get_colorbool('color.diff', stdout_is_tty) == 'true':
+        return ['--color']
+    else:
+        return []
+
 def check_local_changes():
     if git.local_changes():
         raise CmdException('local changes in the tree. Use "refresh" or'

--- a/stgit/config.py
+++ b/stgit/config.py

@@ -109,16 +110,18 @@ class GitConfig:
             if m:
                 result.append(m.group(1))
         return result
+
+    def get_colorbool(self, name, stdout_is_tty):
+        """Invoke 'git config --get-colorbool' and return the result."""
+        return Run('git', 'config', '--get-colorbool', name,
+                   stdout_is_tty).output_one_line()

 config=GitConfig()