Add scripts to create release notes from git log

These script generates a list of commits from git log between
<since> and <until>. The output of this script is in asciidoc
format containting list of commits subject and body.

Bug: issue 1272
Change-Id: I32b2ee055e81c5663128aafefd5f46c2e17e58c8

tools/gitlog2asciidoc.py

@@ -0,0 +1,83 @@
+#!/usr/bin/python
+import sys
+import re
+import subprocess
+
+"""
+This script generates a release note from the output of git log
+between the specified tags.
+
+Arguments:
+since -- tag name
+until -- tag name
+
+Example Input:
+
+   * <commit subject>
+   +
+   <commit message>
+
+   Bug: issue 123
+   Change-Id: <change id>
+   Signed-off-by: <name>
+
+Expected Output:
+
+   * issue 123 <commit subject>
+   +
+   <commit message>
+"""
+
+if len(sys.argv) != 3:
+    sys.exit('Usage: ' + sys.argv[0] + ' <since> <until>')
+since_until = sys.argv[1] + '..' + sys.argv[2]
+proc = subprocess.Popen(['git', 'log', '--reverse', '--no-merges',
+                         since_until, "--format=* %s%n+%n%b"],
+                         stdout=subprocess.PIPE,
+                         stderr=subprocess.STDOUT,)
+
+stdout_value = proc.communicate()[0]
+
+subject = ""
+message = []
+
+for line in stdout_value.splitlines(True):
+
+    if re.match('\* ', line) >= 0:
+        # Write change log for a commit
+        if subject != "":
+            # Write subject
+            sys.stdout.write(subject)
+
+            # Write message lines
+            if message != []:
+                # Clear + from last line in commit message
+                message[-1] = '\n'
+            for m in message:
+                sys.stdout.write(m)
+
+        # Start new commit block
+        message = []
+        subject = line
+        continue
+
+    # Move issue number to subject line
+    elif re.match('Bug: ', line) is not None:
+        line = line.replace('Bug: ', '').replace('\n',' ')
+        subject = subject[:2] + line + subject[2:]
+    # Move issue number to subject line
+    elif re.match('Issue: ', line) is not None:
+        line = line.replace('Issue: ', 'issue ').replace('\n',' ')
+        subject = subject[:2] + line + subject[2:]
+
+    # Remove commit footers
+    elif re.match(r'((\w+-)+\w+:)', line) is not None:
+        continue
+
+    else:
+        if line == '\n':
+            # Don't add extra blank line if last one is already blank
+            if message[-1] != '+\n':
+                message.append('+\n')
+        else:
+            message.append(line)