Added a command, '--revision', the lets you test files that were changed

and committed already.  This is mostly a helpful addition to "Oh, I didn't
lint those!"

Also, added the basic '--pr', which gives you the list of files
changed in the very last commit, so you don't have to specify which
revision you mean.

git_lint/git_lint.py

@@ -271,6 +271,11 @@ def get_filelist(options, extras):
 
         return check_for_conflicts(parse_stream([], stream))
 
+    def revision_list():
+        cmd = ['diff', '--name-only', '-z', options.get('revision')]
+        return [entry for entry in get_git_response(cmd).split(u'\x00')
+                if len(entry) > 0]
+
     def staging_list():
         """ Return the list of files added or modified to the stage """
 
@@ -302,6 +307,9 @@ def get_filelist(options, extras):
         working_directory_trans = base_file_filter
 
     file_list_generator = working_list
+    if 'revision' in options:
+        file_list_generator = revision_list
+        working_directory_trans = base_file_filter
     if 'all' in options:
         file_list_generator = all_list
     if 'staging' in options:
@@ -420,6 +428,9 @@ class Linters:
 
 
 def run_linters(options, config, extras=[]):
+    if 'pr' in options:
+        options.pop('pr')
+        options['revision'] = 'HEAD^..HEAD'
 
     def build_config_subset(keys):
         """ Returns a subset of the configuration, with only those linters mentioned in keys """

git_lint/option_handler.py

@@ -71,7 +71,7 @@ def cleanup_options(options, commandline):
     def longoptstogo(i):
         return i[1] + ((i[2] and '=') or '')
 
-    optstringsshort = ''.join([shortoptstogo(opt) for opt in options])
+    optstringsshort = ''.join([shortoptstogo(opt) for opt in options if opt[0]])
     optstringslong = [longoptstogo(opt) for opt in options]
     (chosen_options, filenames) = getopt.getopt(commandline[1:],
                                                 optstringsshort,

git_lint/options.py

@@ -11,7 +11,11 @@ OPTIONS = [
     ('b', 'base', False,
      _('Check all changed files in the repository, not just those in the current directory.'), []),
     ('a', 'all', False,
-     _('Scan all files in the repository, not just those that have changed.'), []),
+     _('Scan all files in the repository, not just those that have changed.'), ['revision']),
+    ('r', 'revision', True,
+     _('Scan all files changed between revisions'), []),
+    (None, 'pr', False,
+     _('Scan all files changed between head and previous check-in'), ['revision']),
     ('e', 'every', False,
      _('Short for -b -a: scan everything'), []),
     ('w', 'workspace', False,

git_lint/reporters.py

@@ -64,8 +64,7 @@ def print_report(results, unlintable_filenames, cant_lint_filenames,
 def print_help(options, name):
     print(_('Usage: {} [options] [filenames]').format(name))
     for item in options:
-        print(' -{:<1}  --{:<12}  {}'.format(item[0], item[1], item[3]))
+        print(' {:<2}  --{:<12}  {}'.format((item[0] and ('-' + item[0])) or '', item[1], item[3]))
-
 
 def print_version(name, version):
     print(_('{} {} Copyright (c) 2009, 2016 Kennth M. "Elf" Sternberg').format(name, version))