--- a/checker.py	Thu Jun 23 15:06:21 2016 +0800
+++ b/checker.py	Thu Jun 23 15:21:20 2016 +0800
@@ -11,6 +11,9 @@
 import yaml
 
 
+rel = lambda *x: os.path.abspath(os.path.join(os.path.dirname(__file__), *x))
+
+
 def run_ignore_codes(fn, args, codes):
     try:
         return fn(args)
@@ -46,6 +49,20 @@
     return datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S+00:00')
 
 
+def read_linter_config(name, path=rel('linters')):
+    try:
+        fd = open(os.path.join(path, '{}.yml'.format(name)))
+    except Exception as e:
+        print("# C&O couldn't load linter config: {}".format(e))
+        return None
+    with fd:
+        try:
+            return yaml.safe_load(fd)
+        except Exception as e:
+            print("# C&O couldn't parse linter config: {}".format(e))
+            return None
+
+
 def execute(config):
     ok = True
 
@@ -77,20 +94,38 @@
 
     if ok:
         print('# C&O task: setup')
+        linter_config = {}
 
-        venv = '../venv'
-        run(['virtualenv', venv])
-        pip = os.path.join(venv, 'bin', 'pip')
         for linter in config['linters']:
-            if 'pip' in linter:
-                if not run([pip, 'install'] + linter['pip']):
+            if 'name' not in linter:
+                continue
+
+            name = linter['name']
+            if name in linter_config:
+                continue
+
+            lc = read_linter_config(name)
+            if lc is None or 'exec' not in lc:
+                continue
+
+            linter_config[name] = lc
+
+            for item in lc.get('setup', []):
+                if not run(item):
                     ok = False
                     break
 
+            if 'version' in lc and not run(lc['exec'] + lc['version']):
+                ok = False
+                break
+
     if ok:
         print('# C&O task: checks')
         for linter in config['linters']:
-            if 'include' not in linter:
+            if 'name' not in linter or 'include' not in linter:
+                continue
+
+            if linter['name'] not in linter_config:
                 continue
 
             cmd = ['hg', 'files']
@@ -103,10 +138,13 @@
                 ok = False
                 break
 
+            lc = linter_config[linter['name']]
+
             for f in files.splitlines():
-                if 'pip' in linter:
-                    cmd = [os.path.join(venv, 'bin', linter['cmd'])]
-                if not run(cmd + linter.get('flags', []) + [f], ignore_codes=(1,)):
+                cmd = lc['exec']
+                flags = lc.get('flags', []) + linter.get('flags', [])
+                pf = lc.get('post_flags', []) + linter.get('post_flags', [])
+                if not run(cmd + flags + [f] + pf, ignore_codes=(1,)):
                     ok = False
                     break