release.py

#!/usr/bin/env python3
import subprocess
import re

# print changelog
current_tag = subprocess.run(
    ["git", "describe", "--tags", "--abbrev=0"], capture_output=True, text=True
).stdout.strip()
if current_tag == "":
    # os.system("git log HEAD --oneline")
    interval = "HEAD"
else:
    print("current tag: %s" % current_tag)
    interval = "%s..HEAD" % current_tag

print(
    "CHANGELOG:\n\n%s\n"
    % subprocess.run(
        ["git", "log", interval, "--oneline"], capture_output=True, text=True
    ).stdout.strip()
)

version_match_re = r'^version\s*=\s*"([^"]+)"$'

with open("Cargo.toml", "rt") as fp:
    manifest = fp.read()

# parse current version and get next from user
m = re.findall(version_match_re, manifest, re.MULTILINE)
if len(m) != 1:
    print("could not parse current version from Cargo.toml")
    quit()

current_ver = m[0]
next_ver = input("current version is %s, enter next: " % current_ver)

# generate new manifest
result = re.sub(
    version_match_re, 'version = "%s"' % next_ver, manifest, 0, re.MULTILINE
)
with open("Cargo.toml", "w+t") as fp:
    fp.write(result)

# commit, push and create new tag
print("git add Cargo.*")
print("git commit -m 'releasing version %s'" % next_ver)
print("git push")
print("git tag -a v%s -m 'releasing v%s'" % (next_ver, next_ver))
print("git push origin v%s" % next_ver)

# print()
# publish on crates.io
# print("cargo publish")