if hgignore contains errors, print message that is not confusing.

mercurial/dirstate.py

@@ -68,7 +68,8 b' class dirstate(object):'
                     try:
                         syntax = syntaxes[s]
                     except KeyError:
-                        self.ui.warn(_("ignoring invalid syntax '%s'\n") % s)
+                        self.ui.warn(_(".hgignore: ignoring invalid "
+                                       "syntax '%s'\n") % s)
                     continue
                 pat = syntax + line
                 for s in syntaxes.values():
@@ -88,7 +89,8 b' class dirstate(object):'
             ignore = self.hgignore()
             if ignore:
                 files, self.ignorefunc, anypats = util.matcher(self.root,
-                                                               inc=ignore)
+                                                               inc=ignore,
+                                                               src='.hgignore')
             else:
                 self.ignorefunc = util.never
         return self.ignorefunc(fn)

mercurial/util.py

@@ -191,17 +191,17 b' def canonpath(root, cwd, myname):'
     else:
         raise Abort('%s not under root' % myname)
 
-def matcher(canonroot, cwd='', names=['.'], inc=[], exc=[], head=''):
-    return _matcher(canonroot, cwd, names, inc, exc, head, 'glob')
+def matcher(canonroot, cwd='', names=['.'], inc=[], exc=[], head='', src=None):
+    return _matcher(canonroot, cwd, names, inc, exc, head, 'glob', src)
 
-def cmdmatcher(canonroot, cwd='', names=['.'], inc=[], exc=[], head=''):
+def cmdmatcher(canonroot, cwd='', names=['.'], inc=[], exc=[], head='', src=None):
     if os.name == 'nt':
         dflt_pat = 'glob'
     else:
         dflt_pat = 'relpath'
-    return _matcher(canonroot, cwd, names, inc, exc, head, dflt_pat)
+    return _matcher(canonroot, cwd, names, inc, exc, head, dflt_pat, src)
 
-def _matcher(canonroot, cwd, names, inc, exc, head, dflt_pat):
+def _matcher(canonroot, cwd, names, inc, exc, head, dflt_pat, src):
     """build a function to match a set of file patterns
 
     arguments:
@@ -262,7 +262,8 b' def _matcher(canonroot, cwd, names, inc,'
                 pat = '(?:%s)' % regex(k, p, tail)
                 matches.append(re.compile(pat).match)
             except re.error:
-                raise Abort("invalid pattern: %s:%s" % (k, p))
+                if src: raise Abort("%s: invalid pattern: %s:%s" % (src, k, p))
+                else: raise Abort("invalid pattern: %s:%s" % (k, p))
 
         def buildfn(text):
             for m in matches: