mq: initializing patchheader class directly from patch content

The patch header needs only be read in order to instantiate the class,
and as such it makes more sense to do it within the class.

hgext/mq.py

@@ -57,12 +57,86 b' class statusentry:'
         return self.rev + ':' + self.name
 
 class patchheader(object):
-    def __init__(self, message, comments, user, date, haspatch):
+    def __init__(self, pf):
+        def eatdiff(lines):
+            while lines:
+                l = lines[-1]
+                if (l.startswith("diff -") or
+                    l.startswith("Index:") or
+                    l.startswith("===========")):
+                    del lines[-1]
+                else:
+                    break
+        def eatempty(lines):
+            while lines:
+                l = lines[-1]
+                if re.match('\s*$', l):
+                    del lines[-1]
+                else:
+                    break
+
+        message = []
+        comments = []
+        user = None
+        date = None
+        format = None
+        subject = None
+        diffstart = 0
+
+        for line in file(pf):
+            line = line.rstrip()
+            if line.startswith('diff --git'):
+                diffstart = 2
+                break
+            if diffstart:
+                if line.startswith('+++ '):
+                    diffstart = 2
+                break
+            if line.startswith("--- "):
+                diffstart = 1
+                continue
+            elif format == "hgpatch":
+                # parse values when importing the result of an hg export
+                if line.startswith("# User "):
+                    user = line[7:]
+                elif line.startswith("# Date "):
+                    date = line[7:]
+                elif not line.startswith("# ") and line:
+                    message.append(line)
+                    format = None
+            elif line == '# HG changeset patch':
+                format = "hgpatch"
+            elif (format != "tagdone" and (line.startswith("Subject: ") or
+                                           line.startswith("subject: "))):
+                subject = line[9:]
+                format = "tag"
+            elif (format != "tagdone" and (line.startswith("From: ") or
+                                           line.startswith("from: "))):
+                user = line[6:]
+                format = "tag"
+            elif format == "tag" and line == "":
+                # when looking for tags (subject: from: etc) they
+                # end once you find a blank line in the source
+                format = "tagdone"
+            elif message or line:
+                message.append(line)
+            comments.append(line)
+
+        eatdiff(message)
+        eatdiff(comments)
+        eatempty(message)
+        eatempty(comments)
+
+        # make sure message isn't empty
+        if format and format.startswith("tag") and subject:
+            message.insert(0, "")
+            message.insert(0, subject)
+
         self.message = message
         self.comments = comments
         self.user = user
         self.date = date
-        self.haspatch = haspatch
+        self.haspatch = diffstart > 1
 
     def setuser(self, user):
         if not self.setheader(['From: ', '# User '], user):
@@ -314,83 +388,6 b' class queue:'
         if self.series_dirty: write_list(self.full_series, self.series_path)
         if self.guards_dirty: write_list(self.active_guards, self.guards_path)
 
-    def readheaders(self, patch):
-        def eatdiff(lines):
-            while lines:
-                l = lines[-1]
-                if (l.startswith("diff -") or
-                    l.startswith("Index:") or
-                    l.startswith("===========")):
-                    del lines[-1]
-                else:
-                    break
-        def eatempty(lines):
-            while lines:
-                l = lines[-1]
-                if re.match('\s*$', l):
-                    del lines[-1]
-                else:
-                    break
-
-        pf = self.join(patch)
-        message = []
-        comments = []
-        user = None
-        date = None
-        format = None
-        subject = None
-        diffstart = 0
-
-        for line in file(pf):
-            line = line.rstrip()
-            if line.startswith('diff --git'):
-                diffstart = 2
-                break
-            if diffstart:
-                if line.startswith('+++ '):
-                    diffstart = 2
-                break
-            if line.startswith("--- "):
-                diffstart = 1
-                continue
-            elif format == "hgpatch":
-                # parse values when importing the result of an hg export
-                if line.startswith("# User "):
-                    user = line[7:]
-                elif line.startswith("# Date "):
-                    date = line[7:]
-                elif not line.startswith("# ") and line:
-                    message.append(line)
-                    format = None
-            elif line == '# HG changeset patch':
-                format = "hgpatch"
-            elif (format != "tagdone" and (line.startswith("Subject: ") or
-                                           line.startswith("subject: "))):
-                subject = line[9:]
-                format = "tag"
-            elif (format != "tagdone" and (line.startswith("From: ") or
-                                           line.startswith("from: "))):
-                user = line[6:]
-                format = "tag"
-            elif format == "tag" and line == "":
-                # when looking for tags (subject: from: etc) they
-                # end once you find a blank line in the source
-                format = "tagdone"
-            elif message or line:
-                message.append(line)
-            comments.append(line)
-
-        eatdiff(message)
-        eatdiff(comments)
-        eatempty(message)
-        eatempty(comments)
-
-        # make sure message isn't empty
-        if format and format.startswith("tag") and subject:
-            message.insert(0, "")
-            message.insert(0, subject)
-        return patchheader(message, comments, user, date, diffstart > 1)
-
     def removeundo(self, repo):
         undo = repo.sjoin('undo')
         if not os.path.exists(undo):
@@ -433,7 +430,7 b' class queue:'
         if n is None:
             raise util.Abort(_("repo commit failed"))
         try:
-            ph = mergeq.readheaders(patch)
+            ph = patchheader(mergeq.join(patch))
         except:
             raise util.Abort(_("unable to read %s") % patch)
 
@@ -560,7 +557,7 b' class queue:'
             pf = os.path.join(patchdir, patchname)
 
             try:
-                ph = self.readheaders(patchname)
+                ph = patchheader(self.join(patchname))
             except:
                 self.ui.warn(_("Unable to read %s\n") % patchname)
                 err = 1
@@ -1120,7 +1117,7 b' class queue:'
                 raise util.Abort(_("cannot refresh a revision with children"))
             cparents = repo.changelog.parents(top)
             patchparent = self.qparents(repo, top)
-            ph = self.readheaders(patchfn)
+            ph = patchheader(self.join(patchfn))
 
             patchf = self.opener(patchfn, 'r')
 
@@ -1349,7 +1346,7 b' class queue:'
                 summary=False):
         def displayname(patchname):
             if summary:
-                ph = self.readheaders(patchname)
+                ph = patchheader(self.join(patchname))
                 msg = ph.message
                 msg = msg and ': ' + msg[0] or ': '
             else:
@@ -1922,7 +1919,7 b' def refresh(ui, repo, *pats, **opts):'
         if message:
             raise util.Abort(_('option "-e" incompatible with "-m" or "-l"'))
         patch = q.applied[-1].name
-        ph = q.readheaders(patch)
+        ph = patchheader(q.join(patch))
         message = ui.edit('\n'.join(ph.message), ph.user or ui.username())
     setupheaderopts(ui, opts)
     ret = q.refresh(repo, pats, msg=message, **opts)
@@ -1984,7 +1981,7 b' def fold(ui, repo, *files, **opts):'
 
     for p in patches:
         if not message:
-            ph = q.readheaders(p)
+            ph = patchheader(q.join(p))
             if ph.message:
                 messages.append(ph.message)
         pf = q.join(p)
@@ -1994,7 +1991,7 b' def fold(ui, repo, *files, **opts):'
         patch.updatedir(ui, repo, files)
 
     if not message:
-        ph = q.readheaders(parent)
+        ph = patchheader(q.join(parent))
         message, user = ph.message, ph.user
         for msg in messages:
             message.append('* * *')
@@ -2075,7 +2072,7 b' def header(ui, repo, patch=None):'
             ui.write('no patches applied\n')
             return 1
         patch = q.lookup('qtip')
-    ph = repo.mq.readheaders(patch)
+    ph = patchheader(repo.mq.join(patch))
 
     ui.write('\n'.join(ph.message) + '\n')