Git delete branches by regex in local and remote

git-delete-branches.fish

#!/usr/bin/env fish

function git-delete-branches
    # Ensure a regex argument is provided
    if test (count $argv) -lt 1
        echo "Usage: git-delete-branches '<regex>'"
        return 1
    end

    set -l regex $argv[1]

    # Find local and remote branches matching the regex
    set -l branches (
        begin
            git branch --list --format "%(refname:short)"
            git branch --remotes --format "%(refname:short)" | sed 's|origin/||'
        end | sort -u | grep -E "$regex"
    )

    if test -z "$branches"
        echo "No branches matching the pattern: $regex"
        return 0
    end

    echo "The following branches were found:"
    printf "%s\n" $branches

    # Add a blank line for readability
    echo ""
    read -l -P "Are you sure you want to delete these branches? [y/N] " confirm
    if test "$confirm" != y
        echo "Operation canceled."
        return 0
    end

    # Delete local branches
    for branch in $branches
        if git show-ref --verify --quiet "refs/heads/$branch"
            git branch -D "$branch"
        end
    end

    # Delete remote branches
    for branch in $branches
        if git ls-remote --exit-code origin "$branch" >/dev/null 2>&1
            git push origin --delete "$branch"
        end
    end

    echo "Process completed."
end