--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/config.py	Thu Apr 23 15:40:10 2009 -0500
@@ -0,0 +1,93 @@
+from i18n import _
+import re, error
+
+class sortdict(dict):
+    'a simple append-only 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]
+
+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):
+        sectionre = re.compile(r'\[([^\[]+)\]')
+        itemre = re.compile(r'([^=\s]+)\s*=\s*(.*)')
+        contre = re.compile(r'\s+(\S.*)')
+        emptyre = re.compile(r'(;|#|\s*$)')
+        section = ""
+        item = None
+        line = 0
+        cont = 0
+        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
+            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
+            raise error.ConfigError(_('config error at %s:%d: \'%s\'')
+                                    % (path, line, l.rstrip()))