many small changes to templater.

many small changes to templater.

get string code to parse escapes. uses eval now, should parse strings
itself soon.

let caller check if fragment is defined using "in".

make templatepath take optional file name.

--- a/mercurial/templater.py	Sun Feb 26 13:11:53 2006 -0800
+++ b/mercurial/templater.py	Sun Feb 26 20:53:37 2006 -0800
@@ -10,9 +10,9 @@
         self.defaults = defaults
 
         for l in file(mapfile):
-            m = re.match(r'(\S+)\s*=\s*"(.*)"$', l)
+            m = re.match(r'(\S+)\s*=\s*(".*"|\'.*\')$', l)
             if m:
-                self.cache[m.group(1)] = m.group(2)
+                self.cache[m.group(1)] = eval(m.group(2))
             else:
                 m = re.match(r'(\S+)\s*=\s*(\S+)', l)
                 if m:
@@ -20,6 +20,9 @@
                 else:
                     raise LookupError(_("unknown map entry '%s'") % l)
 
+    def __contains__(self, key):
+        return key in self.cache
+
     def __call__(self, t, **map):
         m = self.defaults.copy()
         m.update(map)
@@ -31,7 +34,9 @@
 
     def template(self, tmpl, filters={}, **map):
         while tmpl:
-            m = re.search(r"#([a-zA-Z0-9]+)((%[a-zA-Z0-9]+)*)((\|[a-zA-Z0-9]+)*)#", tmpl)
+            m = re.search(r"#([a-zA-Z_][a-zA-Z0-9_]*)"
+                          r"((%[a-zA-Z_][a-zA-Z0-9_]*)*)"
+                          r"((\|[a-zA-Z_][a-zA-Z0-9_]*)*)#", tmpl)
             if m:
                 yield tmpl[:m.start(0)]
                 v = map.get(m.group(1), "")
@@ -106,8 +111,10 @@
     "rfc822date": lambda x: util.datestr(x, "%a, %d %b %Y %H:%M:%S"),
     }
 
-def templatepath():
-    for f in "templates", "../templates":
-        p = os.path.join(os.path.dirname(__file__), f)
-        if os.path.isdir(p):
+def templatepath(name=None):
+    for f in 'templates', '../templates':
+        fl = f.split('/')
+        if name: fl.append(name)
+        p = os.path.join(os.path.dirname(__file__), *fl)
+        if (name and os.path.exists(p)) or os.path.isdir(p):
             return os.path.normpath(p)