--- a/checker.py	Mon Jun 13 23:05:22 2016 +0800
+++ b/checker.py	Mon Jun 13 23:35:59 2016 +0800
@@ -5,7 +5,7 @@
 from argparse import ArgumentParser, FileType
 from datetime import datetime
 from shutil import rmtree
-from subprocess import check_call, CalledProcessError
+from subprocess import check_call, check_output, CalledProcessError
 from tempfile import mkdtemp
 
 import yaml
@@ -21,23 +21,29 @@
 
 def run_ignore_1(fn, args):
     try:
-        fn(args)
+        return fn(args)
     except CalledProcessError as e:
         if e.returncode != 1:
             raise
+        return e.output
 
 
-def run(args, silent=False, ignore_1=False):
-    if silent:
+def run(args, silent=False, get_output=False, ignore_1=False):
+    if get_output:
+        fn = check_output
+    else:
         fn = check_call
-    else:
-        fn = print_and_run
     try:
+        if not silent:
+            print('$ ' + ' '.join(args))
         if ignore_1:
-            run_ignore_1(fn, args)
+            result = run_ignore_1(fn, args)
         else:
-            fn(args)
-        return True
+            result = fn(args)
+        if get_output:
+            return result
+        else:
+            return True
     except Exception as e:
         print('# C&O error: {}'.format(e))
         print('# C&O job failed')
@@ -89,6 +95,21 @@
                     ok = False
                     break
 
+    if ok:
+        print('# C&O task: checks')
+        for linter in config['linters']:
+            if 'cmd' not in linter or 'files' not in linter:
+                continue
+
+            args = []
+            for fpat in linter['files']:
+                args.extend(['-I', fpat])
+            cmd = ['hg', 'files'] + args
+            files = run(cmd, silent=True, get_output=True, ignore_1=True)
+            if files is False:
+                ok = False
+                break
+
     print('# C&O task: cleanup')
     rmtree(tmp)