[gnome-dvb-daemon] Added script to generate ChangeLog file

[Sebastian Polsterl <sebp src gnome org>]

commit d40b907c091fc987dd84050b416bc5d2902718dc
Author: Sebastian Pölsterl <sebp k-d-w org>
Date:   Thu Apr 21 13:01:34 2011 +0200

    Added script to generate ChangeLog file

 Makefile.am      |    4 +-
 gen-changelog.py |  171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 173 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 39cec73..bbcb8fa 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -132,12 +132,12 @@ DISTCLEANFILES = \
 	$(NULL)
 	
 dist-hook:
-	@if test -d "$(srcdir)/.bzr"; \
+	@if test -d "$(srcdir)/.git"; \
 		then \
 			echo Creating ChangeLog && \
 			( cd "$(top_srcdir)" && \
 				echo '# Generated by Makefile. Do not edit.'; echo; \
-				$(top_srcdir)/missing --run bzr log -v --log-format 'gnu' ) > ChangeLog.tmp \
+				$(top_srcdir)/missing --run python gen-changelog.py ) > ChangeLog.tmp \
 			&& mv -f ChangeLog.tmp $(top_distdir)/ChangeLog \
 			|| ( rm -f ChangeLog.tmp ; \
 				echo Failed to generate ChangeLog >&2 ); \
diff --git a/gen-changelog.py b/gen-changelog.py
new file mode 100644
index 0000000..27c59fd
--- /dev/null
+++ b/gen-changelog.py
@@ -0,0 +1,171 @@
+#!/usr/bin/python
+# Copyright 2008 Marcus D. Hanwell <marcus cryos org>
+# Copyright 2011 Sebastian Poelsterl <sebp k-d-w org>
+# Distributed under the terms of the GNU General Public License v2 or later
+
+import string
+import re
+import os
+import sys
+import textwrap
+
+class ChangeLogGenerator:
+
+    def __init__(self):
+        self.reset()
+        self.fout = None
+        self.commitFound = False
+
+    def reset(self):
+        # Set up the loop variables in order to locate the blocks we want
+        self.authorFound = False
+        self.dateFound = False
+        self.messageFound = False
+        self.messageNL = False
+        self.message = ["", ]
+        self.filesFound = False
+        self.filesModified = set()
+        self.filesAdded = set()
+        self.filesDeleted = set()
+        self.prevAuthorLine = ""
+
+        self.date = None
+        self.author = None
+        self.tag = None
+
+    def run(self):
+        # Execute git log with the desired command line options.
+        fin = os.popen('git log --summary --numstat --no-merges --date=short --decorate', 'r')
+        # Create a ChangeLog file in the current directory.
+        self.fout = sys.stdout
+
+        # The main part of the loop
+        for line in fin:
+            self.process_line(line)
+        self.write_commit()
+        # Close the input and output lines now that we are finished.
+        fin.close()
+        self.fout.close()
+
+    def process_line(self, line):
+        # The commit line marks the start of a new commit object.
+        if line.startswith('commit'):
+            if self.commitFound:
+                self.write_commit()
+
+            # Start all over again...
+            self.reset()
+            self.commitFound = True
+
+            match = re.match(r'commit ([0-9a-f]+) \(tag: (.+)\)', line)
+            if match != None:
+                self.tag = match.group(2)
+        # Match the author line and extract the part we want
+        elif re.match('Author:', line) >=0:
+            authorList = re.split(': ', line, 1)
+            author = authorList[1]
+            self.author = author[0:len(author)-1]
+            self.authorFound = True
+        # Match the date line
+        elif re.match('Date:', line) >= 0:
+            dateList = re.split(':   ', line, 1)
+            date = dateList[1]
+            self.date = date[0:len(date)-1]
+            self.dateFound = True
+        # The svn-id lines are ignored
+        elif re.match('    git-svn-id:', line) >= 0:
+            pass
+        # The sign off line is ignored too
+        elif re.search('Signed-off-by', line) >= 0:
+            pass
+        # Extract the actual commit message for this commit
+        elif self.authorFound and self.dateFound and not self.messageFound:
+            # Find the commit message if we can
+            if len(line) == 1:
+                if self.messageNL:
+                    # After commit message
+                   self.messageFound = True
+                else:
+                    # Before commit message
+                    self.messageNL = True
+            elif len(line) == 5:
+                # blank line in commit message
+                self.message.append("")
+            else:
+                msg = line.strip().replace("\n", "")
+                if len(self.message[-1]) == 0:
+                    self.message[-1] = msg
+                else:
+                    self.message[-1] += " " + msg
+        # Collect the files for this commit.
+        elif self.authorFound and self.dateFound and self.messageFound:
+            fileList = line.split('\t', 3)
+            if len(fileList) > 1:
+                self.filesModified.add(fileList[2].strip())
+            else:
+                self.filesFound = True
+        # All of the parts of the commit have been found - write out the entry
+        if self.authorFound and self.dateFound and self.messageFound and self.filesFound:
+            match = re.match(r' create mode ([0-9]+) (.+)', line)
+            if match != None:
+                f = match.group(2)
+                self.filesAdded.add(f)
+                self.filesModified.remove(f)
+            else:
+                match = re.match(r' delete mode ([0-9]+) (.+)', line)
+                if match != None:
+                    f = match.group(2)
+                    self.filesDeleted.add(f)
+                    self.filesModified.remove(f)
+
+    def write_commit(self):
+        if self.tag != None:
+            self.fout.write("=== %s ===\n" % self.tag)
+
+        # First the author line, only outputted if it is the first for that
+        # author on this day
+        authorLine = self.date + "  " + self.author
+        if len(self.prevAuthorLine) == 0:
+            self.fout.write(authorLine + "\n")
+        elif authorLine == self.prevAuthorLine:
+            pass
+        else:
+            self.fout.write("\n" + authorLine + "\n")
+
+        # Assemble the actual commit message line(s) and limit the line length
+        # to 80 characters.
+        files = self.files_to_string(self.filesAdded)
+        if files != None:
+            self.fout.write(files + ": Added.\n")
+
+        files = self.files_to_string(self.filesDeleted)
+        if files != None:
+            self.fout.write(files + ": Removed.\n")
+
+        files = self.files_to_string(self.filesModified)
+        if files != None:
+            self.fout.write(files + ": Modified.\n")
+
+        commit = "\n"
+        for paragraph in self.message:
+            commit += self.wrap_text(paragraph)
+            commit += "\n\n"
+
+        # Write out the commit line
+        self.fout.write(commit)
+        self.prevAuthorLine = authorLine
+
+    def wrap_text(self, commitLine):
+        txt = textwrap.wrap(commitLine, initial_indent='   ', subsequent_indent='   ')
+        return "\n".join(txt)
+
+    def files_to_string(self, somelist):
+        files = ""
+        for f in somelist:
+            files += "\n  * " + f + ","
+        if len(files) > 0:
+            return files[:-1]
+
+if __name__ == '__main__':
+    c = ChangeLogGenerator()
+    c.run()