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Changelog merging script

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assemble_changelog.py reads changelog entries from ChangeLog.d/*.md
and merges them into ChangeLog.md.

The changelog entries are merged into the first version in
ChangeLog.md. The script does not yet support creating a new version
in ChangeLog.md.

The changelog entries are merged in alphabetical order of the file
names. Future versions of this script are likely to adopt a different
order that reflects the git history of the entries.
This commit is contained in:
Gilles Peskine 2019-10-13 21:44:25 +02:00
parent b1320f3319
commit 40b3f411ec
2 changed files with 262 additions and 0 deletions
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ChangeLog.d/README Normal file
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This directory contains changelog entries that have not yet been merged
to the changelog file (../ChangeLog.md).
A changelog entry file must have the extension *.md and must have the
following format:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
### Section title
* Change descritpion.
* Another change description.
### Another section title
* Yet another change description.
* Yet again another change description.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
See STANDARD_SECTIONS in ../scripts/assemble_changelog.py for
recognized section titles.

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scripts/assemble_changelog.py Executable file
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#!/usr/bin/env python3
"""Assemble Mbed Crypto change log entries into the change log file.
"""
# Copyright (C) 2019, Arm Limited, All Rights Reserved
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This file is part of Mbed Crypto (https://tls.mbed.org)
import argparse
import glob
import os
import re
import sys
class InputFormatError(Exception):
def __init__(self, filename, line_number, message, *args, **kwargs):
self.filename = filename
self.line_number = line_number
self.message = message.format(*args, **kwargs)
def __str__(self):
return '{}:{}: {}'.format(self.filename, self.line_number, self.message)
STANDARD_SECTIONS = (
b'Interface changes',
b'Default behavior changes',
b'Requirement changes',
b'New deprecations',
b'Removals',
b'New features',
b'Security',
b'Bug fixes',
b'Performance improvements',
b'Other changes',
)
class ChangeLog:
"""An Mbed Crypto changelog.
A changelog is a file in Markdown format. Each level 2 section title
starts a version, and versions are sorted in reverse chronological
order. Lines with a level 2 section title must start with '##'.
Within a version, there are multiple sections, each devoted to a kind
of change: bug fix, feature request, etc. Section titles should match
entries in STANDARD_SECTIONS exactly.
Within each section, each separate change should be on a line starting
with a '*' bullet. There may be blank lines surrounding titles, but
there should not be any blank line inside a section.
"""
_title_re = re.compile(br'#*')
def title_level(self, line):
"""Determine whether the line is a title.
Return (level, content) where level is the Markdown section level
(1 for '#', 2 for '##', etc.) and content is the section title
without leading or trailing whitespace. For a non-title line,
the level is 0.
"""
level = re.match(self._title_re, line).end()
return level, line[level:].strip()
def add_sections(self, *sections):
"""Add the specified section titles to the list of known sections.
Sections will be printed back out in the order they were added.
"""
for section in sections:
if section not in self.section_content:
self.section_list.append(section)
self.section_content[section] = []
def __init__(self, input_stream):
"""Create a changelog object.
Read lines from input_stream, which is typically a file opened
for reading.
"""
level_2_seen = 0
current_section = None
self.header = []
self.section_list = []
self.section_content = {}
self.add_sections(*STANDARD_SECTIONS)
self.trailer = []
for line in input_stream:
level, content = self.title_level(line)
if level == 2:
level_2_seen += 1
if level_2_seen <= 1:
self.header.append(line)
else:
self.trailer.append(line)
elif level == 3 and level_2_seen == 1:
current_section = content
self.add_sections(current_section)
elif level_2_seen == 1 and current_section != None:
if line.strip():
self.section_content[current_section].append(line)
elif level_2_seen <= 1:
self.header.append(line)
else:
self.trailer.append(line)
def add_file(self, input_stream):
"""Add changelog entries from a file.
Read lines from input_stream, which is typically a file opened
for reading. These lines must contain a series of level 3
Markdown sections with recognized titles. The corresponding
content is injected into the respective sections in the changelog.
The section titles must be either one of the hard-coded values
in assemble_changelog.py or already present in ChangeLog.md.
"""
filename = input_stream.name
current_section = None
for line_number, line in enumerate(input_stream, 1):
if not line.strip():
continue
level, content = self.title_level(line)
if level == 3:
current_section = content
if current_section not in self.section_content:
raise InputFormatError(filename, line_number,
'Section {} is not recognized',
str(current_section)[1:])
elif level == 0:
if current_section is None:
raise InputFormatError(filename, line_number,
'Missing section title at the beginning of the file')
self.section_content[current_section].append(line)
else:
raise InputFormatError(filename, line_number,
'Only level 3 headers (###) are permitted')
def write(self, filename):
"""Write the changelog to the specified file.
"""
with open(filename, 'wb') as out:
for line in self.header:
out.write(line)
for section in self.section_list:
lines = self.section_content[section]
while lines and not lines[0].strip():
del lines[0]
while lines and not lines[-1].strip():
del lines[-1]
if not lines:
continue
out.write(b'### ' + section + b'\n\n')
for line in lines:
out.write(line)
out.write(b'\n')
for line in self.trailer:
out.write(line)
def finish_output(files_to_remove, changelog, output_file):
"""Write the changelog to the output file.
Remove the specified input files.
"""
if os.path.exists(output_file) and not os.path.isfile(output_file):
# The output is a non-regular file (e.g. pipe). Write to it directly.
output_temp = output_file
else:
# The output is a regular file. Write to a temporary file,
# then move it into place atomically.
output_temp = output_file + '.tmp'
changelog.write(output_temp)
for filename in files_to_remove:
sys.stderr.write('Removing ' + filename + '\n')
#os.remove(filename)
if output_temp != output_file:
os.rename(output_temp, output_file)
def merge_entries(options):
"""Merge changelog entries into the changelog file.
Read the changelog file from options.input.
Read entries to merge from the directory options.dir.
Write the new changelog to options.output.
Remove the merged entries if options.keep_entries is false.
"""
with open(options.input, 'rb') as input_file:
changelog = ChangeLog(input_file)
files_to_merge = glob.glob(os.path.join(options.dir, '*.md'))
if not files_to_merge:
sys.stderr.write('There are no pending changelog entries.\n')
return
for filename in files_to_merge:
with open(filename, 'rb') as input_file:
changelog.add_file(input_file)
files_to_remove = [] if options.keep_entries else files_to_merge
finish_output(files_to_remove, changelog, options.output)
def set_defaults(options):
"""Add default values for missing options."""
output_file = getattr(options, 'output', None)
if output_file is None:
options.output = options.input
if getattr(options, 'keep_entries', None) is None:
options.keep_entries = (output_file is not None)
def main():
"""Command line entry point."""
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--dir', '-d', metavar='DIR',
default='ChangeLog.d',
help='Directory to read entries from (default: ChangeLog.d)')
parser.add_argument('--input', '-i', metavar='FILE',
default='ChangeLog.md',
help='Existing changelog file to read from and augment (default: ChangeLog.md)')
parser.add_argument('--keep-entries',
action='store_true', dest='keep_entries', default=None,
help='Keep the files containing entries (default: remove them if --output/-o is not specified)')
parser.add_argument('--no-keep-entries',
action='store_false', dest='keep_entries',
help='Remove the files containing entries after they are merged (default: remove them if --output/-o is not specified)')
parser.add_argument('--output', '-o', metavar='FILE',
help='Output changelog file (default: overwrite the input)')
options = parser.parse_args()
set_defaults(options)
merge_entries(options)
if __name__ == '__main__':
main()