Automating the process of rewirting git commit messages on a branch using Git

Is there a way to automate the rewriting of commit messages containing a specific substring on a particular branch? For example, in a repository like this:

https://i.sstatic.net/3e4bW.png

I want to modify all commit messages on the mybranch branch (not on main) that start with 🚀 build version by adding the suffix ⚠️ (rebased since).

Is there a git command, bash script, or even a TypeScript script (triggered by ts-node or Deno) that can accomplish this task?

Answer №1

To modify commit messages, consider using the tool git filter-repo mentioned in this previous response.

For a straightforward solution, check out the section titled "Updating commit/tag messages"

If you wish to adjust commit or tag messages using a file like expressions.txt,

🚀 build version==>🚀 build version ⚠️ (rebased since)

execute the command:

git filter-repo --replace-message expressions.txt

Keep in mind that this method won't automatically add ⚠️ (rebased since) to the end of your commit message.

If you require this addition at the end, utilizing a commit-callback is necessary, as demonstrated in the previously mentioned solution.

Answer №2

Following the inspiration of @VonC, I developed this script:

(brew install git-filter-repo is necessary)

#!/bin/bash

# Create a temporary file to store the commit messages
temp_file=$(mktemp)

main_head_hash=$(git rev-parse main)
suffix="⚠️ rebased since!"
# Use git log to get the commit messages and save them in the temporary file
git log --pretty=format:%s $main_head_hash.. | grep -v $suffix | grep '🚀 build version' > $temp_file

# Create a file to store the replacements
echo > replacements.txt

# Iterate through the commit messages in the temporary file
while read commit_message; do
  # Write the replacement message to the replacements.txt file
  echo "$commit_message==>$commit_message $suffix" >> replacements.txt
done < $temp_file


# ⚠️⚠️ Rewriting history ⚠️⚠️
git filter-repo --replace-message replacements.txt --force

# Clean up the temporary files
rm $temp_file
rm replacements.txt

(This script was developed with the assistance of chatGPT, providing clear instructions for scripting. I am mindful of the temporary ban policy of chatGPT and ensure this response does not violate any rules as it is the result of trial and error based on a conversation. The script has been tested and proven to work, aiming to aid others in similar tasks)

https://i.sstatic.net/ipAdZ.png

Answer №3

a)

  • create an empty commit with a new message
  • merge it with an old commit

b)

  • determine the necessary depth

  • rebase it interactively on itself using git rebase -i HEAD~3

  • modify reworded commits with

    exec 310154e tsx reword-commit.ts

  • have reword-commit.ts update the file with the commit message

  • this process can be executed from TypeScript using execa or another TypeScript shell launcher

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