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#!/usr/bin/python3
#
# This lists all new release tags, which need to be built. The list of
# previously known tags is kept in a file given as the argument to this script.
# If the file doesn't exist, all existing release tags are saved there, and
# nothing is printed: this is so that on the first run, nothing is new and
# nothing needs to be built.
#
# A release tag MUST match "vX.Y.Z", where X, Y, and Z are integers.
import os
import re
import subprocess
import sys
TAG_PATTERN = re.compile(r"^v(\d+)?.(\d+)\.(\d+)$")
def release_tags():
p = subprocess.run(["git", "tag", "-l"], check=True, capture_output=True)
lines = p.stdout.decode().splitlines()
return [line for line in lines if tag_sort_key(line) is not None]
def sorted_tags(tags):
return list(sorted(tags, key=tag_sort_key))
def tag_sort_key(tag):
m = TAG_PATTERN.match(tag)
if not m:
return None
return (m.group(1), m.group(2), m.group(3))
def built_tags(filename):
if os.path.exists(filename):
return list(line.strip() for line in open(filename).readlines())
return []
def save_built_tags(filename, tags):
return open(filename, "w").write("".join(f"{tag}\n" for tag in tags))
tags_filename = sys.argv[1]
tags = sorted_tags(release_tags())
if os.path.exists(tags_filename):
built = built_tags(tags_filename)
for tag in tags:
if tag not in built:
print(tag)
built.append(tag)
else:
built = tags
save_built_tags(tags_filename, built)
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