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#!/usr/bin/python3
import sys
import re
CHANGELOG = 'CHANGELOG.md'
if len(sys.argv) < 2:
print(f'Usage: python {sys.argv[0]} <TAG>', file=sys.stderr)
sys.exit(1)
tag = sys.argv[1]
if not re.match(r'v\d+\.\d+(\.\d+)?', tag):
print(f'The tag {tag} does not match the rule vX.X or vX.X.X', file=sys.stderr)
sys.exit(1)
version = tag[1:]
print(f'Locating version {version} in {CHANGELOG}', file=sys.stderr)
pattern_version = re.compile(rf'^##\s*{re.escape(version)}\s*')
pattern_header = re.compile(r'^##\s*')
lines = None
try:
with open(CHANGELOG) as f:
lines = f.readlines()
except OSError as e:
print(f'Failed to read file {CHANGELOG}: {e}')
sys.exit(1)
capturing = False
for line in lines:
if not capturing:
# mark if found the target version section
if pattern_version.match(line.strip()):
capturing = True
else:
# print the whole line if the line is not next version section
if pattern_header.match(line.strip()):
break
print(line, end='') # already containing a '\n'
if not capturing: # no match
print(f'No match version section for {version}', file=sys.stderr)
sys.exit(1)
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