A bash script creating a branch for every commit in the current branch relative to the parent one (for PR trains)

git-create-pr-train.sh

#!/bin/env bash

parent_branch="$1"
original_branch="$2"
if [ -z "$parent_branch" ]; then
    echo "Please provide branch name as argument"
    exit 1
fi
if [ -z "$original_branch" ]; then
    echo "Using current branch for the train"
    original_branch=$(git rev-parse --abbrev-ref HEAD)
fi

# Get the branch point from master
branch_point=$(git merge-base "$parent_branch" "$original_branch")

# Get list of commits from branch point to tip of branch, in reverse order
commits=$(git rev-list --reverse "$branch_point..$original_branch")

commit_count=$(echo "$commits" | wc -l)

echo "This will create $commit_count branches:"
echo
git log --oneline "$branch_point..$original_branch" | nl
echo

read -p "Proceed? (y/n) " -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
    echo "Operation cancelled"
    exit 1
fi

# Save current state
current_branch=$(git rev-parse --abbrev-ref HEAD)

# Counter for branch naming
counter=1

# Previous commit hash for chaining
previous=$branch_point

created_branches=()

for commit in $commits; do
    new_branch_name="$original_branch-$counter"

    # Create new branch from the previous commit
    git checkout -b "$new_branch_name" "$previous"

    # Cherry-pick this commit
    git cherry-pick "$commit"

    # Store this commit as previous for next iteration
    previous=$commit

    echo "Created branch $new_branch_name"
    created_branches+=("$new_branch_name")
    counter=$((counter + 1))
done

# Return to original branch
git checkout "$current_branch"

echo "Done! Created $((counter-1)) branches"

echo
read -p "Do you want to push these branches to origin? (y/n) " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]
then
    echo "Pushing branches to origin..."
    for branch in "${created_branches[@]}"
    do
        echo "Pushing $branch..."
        git push -u origin "$branch"
    done
    echo "All branches pushed to origin"
else
    echo "Branches created locally only"
fi