A bash function that enables you to mass delete LOCAL git branches

clean_branches_local.sh

#!/bin/bash

# What is this?
# A bash function that enables you to mass delete LOCAL git branches
# When run, a prompt will appear showing the branches to delete and you can either
# choose to proceed or cancel

# Configuration
# You can provide a list of branches to always exclude as well as a list of branches 
# to exclude at time of invocation (comma separated string). It is recommended to configure
# the the list of permanent_exclusions (defaults to none)

# Supported Shells
# The bash scripts have been tested against zsh for Mac and git bash for Windows
# other bash shells may also work, but have not been tested so your mileage may vary

# Recommended Installation for Mac (zsh)
# 1. Save the file in ~
# 2. Update your .zshrc file (~/.zshrc) with the following:
#   alias cb-local="source ~/clean_branches_local.sh; main"

# Recommended Installation for Windows (git bash)
# 1. Save the file in ~
# 2. Update your .bash_profile file (~/.bash_profile) with the following:
#   alias cb-local="source ~/clean_branches_local.sh; main"

# Running the command
# 1. Use the terminal to navigate to a github project
# 2. Run cb-local

# Running the command with adhoc exclusions
# 1. Use the terminal to navigate to a github project
# 2. Run cb-local followed by a comma separated string of branches to exclude for example:
#   cb-local branch1,branch2,branch3

main () {
    local permanent_exclusions_array=() # list of branches that should always be excluded from deletion
    
    # combine permanent exclusions and adhoc exclusions
    if [ $# -eq 0 ]; then
        # user did not provide adhoc exclusions
        local all_exclusions_array=("${permanent_exclusions_array[@]}")
    else
        local adhoc_exclusions="$1" # comma separated list of branches to exclude provided by user when the function is invoked. ie: cb-local branch1,branch2
        local adhoc_exclusions_array=( $(echo "$adhoc_exclusions" | tr ',' '\n') ) # split adhoc_exclusions by , into array
        local all_exclusions_array=( "${adhoc_exclusions_array[@]}" "${permanent_exclusions_array[@]}" )
    fi

    # exclude current branch from deletion as git will throw an error if we try to delete
    local current_branch="$(git rev-parse --abbrev-ref HEAD)"
    all_exclusions_array+=($current_branch)
    
    # get list of branches to delete (minus any exclusions)
    local exclusions_filter="$(echo "$(join_by_string "\\|" "${all_exclusions_array[@]}")")"
    local branches_to_delete="$(git branch | grep -v "$exclusions_filter")"

    # if no branches to delete, then exit early
    if [ -z "$branches_to_delete" ]; then
        echo "✨ Everything looks clean, no branches found ✨"
        return
    fi

    echo "🗑️ Clean Local Branches 🗑️"
    echo "$branches_to_delete"
    echo -n "🚫 Are you sure you want to delete these LOCAL branches? [y/n] "

    local old_stty_cfg="$(stty -g)"
    stty raw -echo > /dev/null 2>&1
    local answer="$( while ! head -c 1 | grep -i '[ny]' ;do true ;done )"
    stty "$old_stty_cfg"
    if echo "$answer" | grep -iq "^y" ;then
        echo Yes
        echo "$branches_to_delete" | xargs git branch -D
    else
        echo No
    fi
}

# https://dev.to/meleu/how-to-join-array-elements-in-a-bash-script-303a
join_by_string() {
    local separator="$1"
    shift
    local first="$1"
    shift
    printf "%s" "$first" "${@/#/$separator}"
}