config: add %unset name support

mercurial/config.py

@@ -1,106 +1,117 b''
 from i18n import _
 import re, error, os
 
 class sortdict(dict):
-    'a simple append-only sorted dictionary'
+    'a simple sorted dictionary'
     def __init__(self, data=None):
         self._list = []
         if data:
             if hasattr(data, '_list'):
                 self._list = list(data._list)
             self.update(data)
     def copy(self):
         return sortdict(self)
     def __setitem__(self, key, val):
         if key in self:
             self._list.remove(key)
         self._list.append(key)
         dict.__setitem__(self, key, val)
     def __iter__(self):
         return self._list.__iter__()
     def update(self, src):
         for k in src:
             self[k] = src[k]
     def items(self):
         return [(k,self[k]) for k in self._list]
+    def __delitem__(self, key):
+        dict.__delitem__(self, key)
+        self._list.remove(key)
 
 class config:
     def __init__(self, data=None):
         self._data = {}
         if data:
             for k in data._data:
                 self._data[k] = data[k].copy()
     def copy(self):
         return config(self)
     def __contains__(self, section):
         return section in self._data
     def update(self, src, sections=None):
         if not sections:
             sections = src.sections()
         for s in sections:
             if s not in src:
                 continue
             if s not in self:
                 self._data[s] = sortdict()
             for k in src._data[s]:
                 self._data[s][k] = src._data[s][k]
     def get(self, section, item, default=None):
         return self._data.get(section, {}).get(item, (default, ""))[0]
     def getsource(self, section, item):
         return self._data.get(section, {}).get(item, (None, ""))[1]
     def sections(self):
         return sorted(self._data.keys())
     def items(self, section):
         return [(k, v[0]) for k,v in self._data.get(section, {}).items()]
     def set(self, section, item, value, source=""):
         if section not in self:
             self._data[section] = sortdict()
         self._data[section][item] = (value, source)
 
     def read(self, path, fp=None):
         sectionre = re.compile(r'\[([^\[]+)\]')
         itemre = re.compile(r'([^=\s]+)\s*=\s*(.*)')
         contre = re.compile(r'\s+(\S.*)')
         emptyre = re.compile(r'(;|#|\s*$)')
+        unsetre = re.compile(r'%unset\s+(\S.*)')
         includere = re.compile(r'%include\s+(\S.*)')
         section = ""
         item = None
         line = 0
         cont = 0
 
         if not fp:
             fp = open(path)
 
         for l in fp:
             line += 1
             if cont:
                 m = contre.match(l)
                 if m:
                     v = self.get(section, item) + "\n" + m.group(1)
                     self.set(section, item, v, "%s:%d" % (path, line))
                     continue
                 item = None
             m = includere.match(l)
             if m:
                 inc = m.group(1)
                 base = os.path.dirname(path)
                 inc = os.path.normpath(os.path.join(base, inc))
                 incfp = open(inc)
                 self.read(inc, incfp)
                 continue
             if emptyre.match(l):
                 continue
             m = sectionre.match(l)
             if m:
                 section = m.group(1)
                 if section not in self:
                     self._data[section] = sortdict()
                 continue
             m = itemre.match(l)
             if m:
                 item = m.group(1)
                 self.set(section, item, m.group(2), "%s:%d" % (path, line))
                 cont = 1
                 continue
+            m = unsetre.match(l)
+            if m:
+                name = m.group(1)
+                if self.get(section, name) != None:
+                    del self._data[section][name]
+                continue
+
             raise error.ConfigError(_('config error at %s:%d: \'%s\'')
                                     % (path, line, l.rstrip()))