Add changelog generator script based on Edward's.

The script looks for a CHANGELOG_START tag to start generating from,
and parses RELEASE-x_y_z tags to insert release markers in the ChangeLog

1 files changed, 99 insertions, 0 deletions

diff --git a/gen-changelog.py b/gen-changelog.py
new file mode 100644
index 0000000..cd139a7
--- /dev/null
+++ b/gen-changelog.py
@@ -0,0 +1,99 @@
+#!/usr/bin/env python
+
+import sys
+import subprocess
+import re
+
+# Makes a GNU-Style ChangeLog from a git repository
+# Handles git-svn repositories also
+
+# Arguments : same as for git log
+release_refs={}
+
+def process_commit(lines, files):
+    # DATE NAME
+    # BLANK LINE
+    # Subject
+    # BLANK LINE
+    # ...
+    # FILES
+    fileincommit = False
+    lines = [x.strip() for x in lines if x.strip() and not x.startswith('git-svn-id')]
+    files = [x.strip() for x in files if x.strip()]
+    for l in lines:
+        if l.startswith('* ') and ':' in l:
+            fileincommit = True
+            break
+
+    top_line = lines[0]
+    print top_line.strip()
+    print
+    if not fileincommit:
+        for f in files:
+            print '\t* %s:' % f
+    for l in lines[1:]:
+        print '\t ', l
+    print
+
+def output_commits():
+    cmd = ['git', 'log', '--pretty=format:--START-COMMIT--%H%n%ai  %an <%ae>%n%n%s%n%b%n--END-COMMIT--',
+           '--date=short', '--name-only']
+
+    start_tag = find_start_tag()
+
+    if start_tag is None:
+        cmd.extend(sys.argv[1:])
+    else:
+        cmd.extend(["%s..HEAD" % (start_tag)])
+
+    p = subprocess.Popen(args=cmd, shell=False, stdout=subprocess.PIPE)
+    buf = []
+    files = []
+    filemode = False
+    for lin in p.stdout.readlines():
+        if lin.startswith("--START-COMMIT--"):
+            if buf != []:
+                process_commit(buf, files)
+            hash = lin[16:].strip()
+            try:
+                rel = release_refs[hash]
+                print "=== release %d.%d.%d ===\n" % (int(rel[0]), int(rel[1]), int(rel[2]))
+            except:
+                pass
+            buf = []
+            files = []
+            filemode = False
+        elif lin.startswith("--END-COMMIT--"):
+            filemode = True
+        elif filemode == True:
+            files.append(lin)
+        else:
+            buf.append(lin)
+    if buf != []:
+        process_commit(buf, files)
+
+def get_rel_tags():
+    # Populate the release_refs dict with the tags for previous releases
+    reltagre = re.compile("^([a-z0-9]{40}) refs\/tags\/RELEASE-([0-9]+)[-_.]([0-9]+)[-_.]([0-9]+)\^\{\}")
+
+    cmd = ['git', 'show-ref', '--tags', '--dereference']
+    p = subprocess.Popen(args=cmd, shell=False, stdout=subprocess.PIPE)
+    for lin in p.stdout.readlines():
+       match = reltagre.search (lin)
+       if match:
+           (sha, maj, min, nano) = match.groups()  
+           release_refs[sha] = (maj, min, nano)
+
+def find_start_tag():
+    starttagre = re.compile("^([a-z0-9]{40}) refs\/tags\/CHANGELOG_START")
+    cmd = ['git', 'show-ref', '--tags']
+    p = subprocess.Popen(args=cmd, shell=False, stdout=subprocess.PIPE)
+    for lin in p.stdout.readlines():
+       match = starttagre.search (lin)
+       if match:
+           return match.group(1)
+    return None
+
+if __name__ == "__main__":
+    get_rel_tags()
+    output_commits()