--- a/checker.py	Thu Jul 07 13:58:38 2016 +0800
+++ b/checker.py	Thu Jul 07 14:08:01 2016 +0800
@@ -80,6 +80,35 @@
     return ok
 
 
+def hg_clone(url, dest):
+    return run(['hg', 'clone', url, dest])
+
+
+def hg_summary():
+    return run(['hg', 'sum'])
+
+
+def hg_log():
+    template = (r'# C&O commit: {rev}:{node}\n'
+                r'# C&O commit branch: {branch}\n'
+                r'# C&O commit date: {date|isodatesec}\n'
+                r'# C&O commit author: {author|person}\n'
+                r'# C&O commit message: {desc|firstline}\n')
+    return run(['hg', 'log', '-r', '.', '-T', template], silent=True)
+
+
+def hg_files(include, exclude):
+    cmd = ['hg', 'files']
+    for pat in include:
+        cmd.extend(('-I', pat))
+    for pat in exclude:
+        cmd.extend(('-X', pat))
+    files = run(cmd, silent=True, get_output=True, ignore_codes=(1,))
+    if files is not False:
+        files = files.splitlines()
+    return files
+
+
 def execute(tmp, config):
     if not prevalidate(config):
         return False
@@ -89,24 +118,23 @@
 
     print('# C&O task: clone')
     print('# C&O project URL: {}'.format(config['url']))
-    os.environ['HGPLAIN'] = '1'
+    if config['scm'] == 'hg':
+        os.environ['HGPLAIN'] = '1'
 
-    if not run(['hg', 'clone', config['url'], source]):
-        return False
+    if config['scm'] == 'hg':
+        if not hg_clone(config['url'], source):
+            return False
 
     print('$ cd {}'.format(source))
     os.chdir(source)
 
-    if not run(['hg', 'sum']):
-        return False
+    if config['scm'] == 'hg':
+        if not hg_summary():
+            return False
 
-    template = (r'# C&O commit: {rev}:{node}\n'
-                r'# C&O commit branch: {branch}\n'
-                r'# C&O commit date: {date|isodatesec}\n'
-                r'# C&O commit author: {author|person}\n'
-                r'# C&O commit message: {desc|firstline}\n')
-    if not run(['hg', 'log', '-r', '.', '-T', template], silent=True):
-        return False
+    if config['scm'] == 'hg':
+        if not hg_log():
+            return False
 
     print('# C&O task: setup')
 
@@ -146,18 +174,14 @@
         if linter['name'] not in linter_config:
             continue
 
-        cmd = ['hg', 'files']
-        for pat in linter['include']:
-            cmd.extend(('-I', pat))
-        for pat in linter.get('exclude', []):
-            cmd.extend(('-X', pat))
-        files = run(cmd, silent=True, get_output=True, ignore_codes=(1,))
+        if config['scm'] == 'hg':
+            files = hg_files(linter['include'], linter.get('exclude', []))
         if files is False:
             return False
 
         lc = linter_config[linter['name']]
 
-        for f in files.splitlines():
+        for f in files:
             cmd = lc['exec']
             flags = lc.get('flags', []) + linter.get('flags', [])
             pf = lc.get('post_flags', []) + linter.get('post_flags', [])