Fast git branch switching (git-switchbranch)

git-switchbranch

#!/bin/bash

######################################################################################
# THIS GIST IS NO LONGER MAINTAINED AND MAY BE DELETED IN THE FUTURE!                #
# PLEASE GO TO https://github.com/shadowhand/git-switchbranch FOR A CURRENT VERSION! #
######################################################################################

# git-switchbranch
# @link https://gist.github.com/shadowhand/9813453
# @author shadowhand https://github.com/shadowhand
# @license MIT
#
# installation:
# save this file as git-switchbranch somewhere in your $PATH
# make it executable: chmod +x git-switchbranch
#
# optional:
# git config --global alias.sb '! git switchbranch'
#
# usage:
# git switchbranch
# select the branch you want to move to using numbers
# press enter
# ???
# profit
#
# enjoy!
#

usage() {
	echo "usage: git switchbranch [-a] [-r <remote>]"
}

# changelog
#
# 0.0.4
# - update prompt
# 
# 0.0.3
# - update comments, documentation
# - fix select menu issues when in detached HEAD mode
# - added new options -a, -r $remote for selecting non-local branches
#
# 0.0.2
# - branch named "master" will always be first in menu
#
# 0.0.1
# - initial release
#
version() {
    echo "switchbranch v0.0.4"
}

_select_branch() {
    # First branch is always set to "master", or whatever local branch is first when looking for master
    # Search all branches, not just local?
    local branchargs="--list"
    local remote=""
    while getopts "r:a" o; do
        case $o in
            "a")
                # select all branches
                branchargs="$branchargs -a"
                ;;
            "r")
                # show a specific remote
                branchargs="$branchargs -r"
                remote="$OPTARG"
                ;;
        esac
    done
    # branch names, removing detached and no branch warnings, and also trimming whitespace
    if [[ ! -z $remote ]]; then
        local branches=($(git branch $branchargs | grep -v -e '\->' -e '\* (detached from .*)' -e '(no branch)' | grep "$remote/" | sed -e 's/*//' -e 's/^[ \t]+//'))
    else
        local branches=($(git branch $branchargs | grep -v -e '\->' -e '\* (detached from .*)' -e '(no branch)' | sed -e 's/*//' -e 's/^[ \t]+//'))
    fi
    if [[ ! -z $remote ]]; then
        # remove the remote from the branch name
        branches=(${branches[@]/$remote\//})
    fi
    for (( i=0; i < ${#branches[@]}; i++ )); do
        # attempt to find a master branch
        if [[ "${branches[$i]}" == *"master" ]]; then
            local master="${branches[$i]}"
            unset branches[$i]
            break # found one, stop looking
        fi
    done
    if [[ ! -z $master ]]; then
        # ensure that master branch is placed in front
        branches=("$master" "${branches[@]}")
    fi
    # Set the prompt string
    PS3="--> Switch branch [1-${#branches[@]}] or [q]? "
    # ask for input!
    select selected in ${branches[@]}; do
        if [ "$selected" == "quit" -o "$selected" == "q" -o "$selected" == "" ]; then
            exit 1
        fi
        git checkout "$selected"
        exit 0
    done
}

main() {
    local command="$1"
    case $command in
        "version") version;;
        *) _select_branch "$@";;
    esac
}

main "$@"

v0.0.4