[gnome-python] Add ChangeLog generation support from GIT

[Gustavo J. A. M. Carneiro <gjc src gnome org>]

commit a0b17e3456eb8f85f4279bbfdecb4fcca4f7d56c
Author: Gustavo Carneiro <gjc inescporto pt>
Date:   Sat May 2 17:06:07 2009 +0100

    Add ChangeLog generation support from GIT
---
 generate-ChangeLog  |   27 ++++++++---
 gitlog2changelog.py |  124 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+), 7 deletions(-)

diff --git a/generate-ChangeLog b/generate-ChangeLog
index c944154..19b932b 100755
--- a/generate-ChangeLog
+++ b/generate-ChangeLog
@@ -1,12 +1,25 @@
 #!/bin/sh
 
-## Uses the GNU ChangeLog formatter plugin:
-##   http://telecom.inescporto.pt/~gjc/gnulog.py
-
-export BZR_PLUGIN_PATH=`pwd`/bzrplugins
-
 ChangeLog=$(dirname $0)/ChangeLog
-	
 chmod u+w $ChangeLog 2> /dev/null
-bzr log -v --log-format 'gnu' -r 538..-1   > $ChangeLog
+
+if [ -d .bzr ]; then
+  ## Uses the GNU ChangeLog formatter plugin:
+  ##   http://telecom.inescporto.pt/~gjc/gnulog.py
+  export BZR_PLUGIN_PATH=`pwd`/bzrplugins
+  bzr log -v --log-format 'gnu' -r 538..-1   > $ChangeLog
+
+elif [ -d .git ]; then
+
+  $(dirname $0)/gitlog2changelog.py
+
+else
+
+  echo "ERROR: not a bzr or git repository, cannot generate ChangeLog."
+  exit 2;
+
+fi
+
 chmod a-w $ChangeLog
+
+
diff --git a/gitlog2changelog.py b/gitlog2changelog.py
new file mode 100755
index 0000000..ce69b68
--- /dev/null
+++ b/gitlog2changelog.py
@@ -0,0 +1,124 @@
+#!/usr/bin/python
+# Copyright 2008 Marcus D. Hanwell <marcus cryos org>
+# Distributed under the terms of the GNU General Public License v2 or later
+
+import string, re, os
+
+# Execute git log with the desired command line options.
+fin = os.popen('git log --summary --stat --no-merges --date=short', 'r')
+# Create a ChangeLog file in the current directory.
+fout = open('ChangeLog', 'w')
+
+# Set up the loop variables in order to locate the blocks we want
+authorFound = False
+dateFound = False
+messageFound = False
+filesFound = False
+message = ""
+messageNL = False
+files = ""
+prevAuthorLine = ""
+
+# The main part of the loop
+for line in fin:
+    # The commit line marks the start of a new commit object.
+    if string.find(line, 'commit') >= 0:
+        # Start all over again...
+        authorFound = False
+        dateFound = False
+        messageFound = False
+        messageNL = False
+        message = ""
+        filesFound = False
+        files = ""
+        continue
+    # Match the author line and extract the part we want
+    elif re.match('Author:', line) >=0:
+        authorList = re.split(': ', line, 1)
+        author = authorList[1]
+        author = author[0:len(author)-1]
+        authorFound = True
+    # Match the date line
+    elif re.match('Date:', line) >= 0:
+        dateList = re.split(':   ', line, 1)
+        date = dateList[1]
+        date = date[0:len(date)-1]
+        dateFound = True
+    # The svn-id lines are ignored
+    elif re.match('    git-svn-id:', line) >= 0:
+        continue
+    # The sign off line is ignored too
+    elif re.search('Signed-off-by', line) >= 0:
+        continue
+    # Extract the actual commit message for this commit
+    elif authorFound & dateFound & messageFound == False:
+        # Find the commit message if we can
+        if len(line) == 1:
+            if messageNL:
+                messageFound = True
+            else:
+                messageNL = True
+        elif len(line) == 4:
+            messageFound = True
+        else:
+            if len(message) == 0:
+                message = message + line.strip()
+            else:
+                message = message + " " + line.strip()
+    # If this line is hit all of the files have been stored for this commit
+    elif re.search('files changed', line) >= 0:
+        filesFound = True
+        continue
+    # Collect the files for this commit. FIXME: Still need to add +/- to files
+    elif authorFound & dateFound & messageFound:
+        fileList = re.split(' \| ', line, 2)
+        if len(fileList) > 1:
+            if len(files) > 0:
+                files = files + ", " + fileList[0].strip()
+            else:
+                files = fileList[0].strip()
+    # All of the parts of the commit have been found - write out the entry
+    if authorFound & dateFound & messageFound & filesFound:
+        # First the author line, only outputted if it is the first for that
+        # author on this day
+        authorLine = date + "  " + author
+        if len(prevAuthorLine) == 0:
+            fout.write(authorLine + "\n")
+        elif authorLine == prevAuthorLine:
+            pass
+        else:
+            fout.write("\n" + authorLine + "\n")
+
+        # Assemble the actual commit message line(s) and limit the line length
+        # to 80 characters.
+        commitLine = "* " + files + ": " + message
+        i = 0
+        commit = ""
+        while i < len(commitLine):
+            if len(commitLine) < i + 78:
+                commit = commit + "\n  " + commitLine[i:len(commitLine)]
+                break
+            index = commitLine.rfind(' ', i, i+78)
+            if index > i:
+                commit = commit + "\n  " + commitLine[i:index]
+                i = index+1
+            else:
+                commit = commit + "\n  " + commitLine[i:78]
+                i = i+79
+
+        # Write out the commit line
+        fout.write(commit + "\n")
+
+        #Now reset all the variables ready for a new commit block.
+        authorFound = False
+        dateFound = False
+        messageFound = False
+        messageNL = False
+        message = ""
+        filesFound = False
+        files = ""
+        prevAuthorLine = authorLine
+
+# Close the input and output lines now that we are finished.
+fin.close()
+fout.close()