Build the app and check the bundle size (gzip compressed) for every commit in a repo, writing the results to a CSV file

bundle_size_history.py

import subprocess
import csv
import shutil
from pathlib import Path
from datetime import datetime
from tqdm import tqdm

def run_cmd(cmd):
  try:
    return subprocess.run(cmd, shell=True, check=True, capture_output=True, text=True)
  except subprocess.CalledProcessError:
    return None

commits = run_cmd('git log --format="%H,%ct" master')
if not commits:
  exit(1)

commit_list = commits.stdout.strip().split('\n')

with open('bundle_sizes.csv', 'wt', newline='', buffering=1) as f:
  writer = csv.writer(f)
  writer.writerow(['commit', 'date', 'size_kib'])

  for line in tqdm(commit_list, desc="Processing commits"):
    commit_hash, timestamp = line.strip('"').split(',')

    if not run_cmd(f'git checkout {commit_hash}'):
      continue
    if not run_cmd('bun install --frozen-lockfile'):
      continue

    if Path('dist').exists():
      shutil.rmtree('dist')
    if not run_cmd('bun run build'):
      continue

    size = run_cmd('find dist -type f ! -name "*.map" -exec sh -c \'gzip -9c "{}" | wc -c\' \\; | awk \'{total += $1} END {print int(total/1024)}\'')
    if not size:
      continue

    date = datetime.fromtimestamp(int(timestamp)).isoformat()
    writer.writerow([commit_hash, date, size.stdout.strip()])

run_cmd('git checkout master')