bash shell에서 powerline 과 같은 효과

.bash-powerline.sh

#!/usr/bin/env bash

# Powerline
# https://github.com/powerline/powerline
# JS 버전
# https://github.com/ceejbot/powerline-js
# Python 버전
# https://github.com/banga/powerline-shell

# for c in {0..255}; do tput setaf $c; tput setaf $c | cat -v; echo =$c; done

powerline() {
    # Unicode symbols
    readonly PS_SYMBOL_DARWIN='$'
    readonly PS_SYMBOL_LINUX='$'
    readonly PS_SYMBOL_OTHER='%'
    readonly GIT_BRANCH_SYMBOL=''
    readonly GIT_BRANCH_CHANGED_SYMBOL='✔'
    readonly GIT_BRANCH_UNCHANGED_SYMBOL='✎'
    readonly GIT_NO_REMOTE_SYMBOL='✕'
    readonly GIT_REMOTE_FETCH_SYMBOL='↻'
    readonly GIT_REMOTE_CHECK_INTERVAL=300
    readonly GIT_NEED_PUSH_SYMBOL='⇡'
    readonly GIT_NEED_PULL_SYMBOL='⇣'
    readonly SYMBOL_ARROW=''
    readonly SYMBOL_ARROW_HEAD=''

    readonly FG_WHITE="\[$(tput setaf 15)\]"
    readonly FG_BLACK="\[$(tput setaf 0)\]"
    readonly FG_YELLOW="\[$(tput setaf 3)\]"
    readonly FG_ORANGE="\[$(tput setaf 9)\]"
    readonly FG_RED="\[$(tput setaf 1)\]"
    readonly FG_MAGENTA="\[$(tput setaf 5)\]"
    readonly FG_VIOLET="\[$(tput setaf 13)\]"
    readonly FG_BLUE="\[$(tput setaf 4)\]"
    readonly FG_CYAN="\[$(tput setaf 6)\]"
    readonly FG_GREEN="\[$(tput setaf 2)\]"
    readonly FG_GRAY="\[$(tput setaf 235)\]"

    readonly BG_YELLOW="\[$(tput setab 3)\]"
    readonly BG_ORANGE="\[$(tput setab 9)\]"
    readonly BG_RED="\[$(tput setab 1)\]"
    readonly BG_MAGENTA="\[$(tput setab 5)\]"
    readonly BG_VIOLET="\[$(tput setab 13)\]"
    readonly BG_BLUE="\[$(tput setab 4)\]"
    readonly BG_CYAN="\[$(tput setab 6)\]"
    readonly BG_GREEN="\[$(tput setab 2)\]"
    readonly BG_GRAY="\[$(tput setab 241)\]"

    readonly DIM="\[$(tput dim)\]"
    readonly REVERSE="\[$(tput rev)\]"
    readonly RESET="\[$(tput sgr0)\]"
    readonly BOLD="\[$(tput bold)\]"

    # what OS?
    case "$(uname)" in
        Darwin)
            readonly PS_SYMBOL=$PS_SYMBOL_DARWIN
            ;;
        Linux)
            readonly PS_SYMBOL=$PS_SYMBOL_LINUX
            ;;
        *)
            readonly PS_SYMBOL=$PS_SYMBOL_OTHER
    esac

    git_status() {
        # git not found
        [ -x "$(which git)" ] || return

        # force git output in English to make our work easier
        local GIT_ENGLISH="env LANG=C git"
        # get current CURRENT_BRANCH name or short SHA1 hash for detached head
        # name-rev --name-only HEAD
        # rev-parse --abbrev-ref HEAD
        # symbolic-ref --short HEAD
        #  || $GIT_ENGLISH describe --tags --always 2>/dev/null
        # TODO 정확한 브랜치명 가져오도록 변경 필요
        local CURRENT_BRANCH="$($GIT_ENGLISH rev-parse --abbrev-ref HEAD 2>/dev/null)"
        [ -n "$CURRENT_BRANCH" ] || return  # git branch not found

        # branch is modified?
        local STATUS_MARKS
        if [ -n "$($GIT_ENGLISH status --porcelain)" ]
        then
            STATUS_MARKS+="$GIT_BRANCH_UNCHANGED_SYMBOL "
        else
            STATUS_MARKS+="$GIT_BRANCH_CHANGED_SYMBOL "
        fi

        # remote check
        if [[ -n $($GIT_ENGLISH remote show) ]]
        then
            # 현재 REPO_PATH
            local REPO_PATH=$($GIT_ENGLISH rev-parse --show-toplevel 2>/dev/null)
            # 현재 repo 의 FETCH_HEAD
            local FETCH_HEAD="$REPO_PATH/.git/FETCH_HEAD"

            # 현재 시각
            local TIME_NOW=`date '+%s' 2>/dev/null`
            # 마지막 fetch 시각
            if [[ "$(uname)" == 'Darwin' ]]
            then
                local TIME_FETCH=`stat -f '%m' $FETCH_HEAD 2>/dev/null`
            else
                local TIME_FETCH=`stat  -c %Y $FETCH_HEAD 2>/dev/null`
            fi

            if (( $TIME_NOW - $TIME_FETCH - $GIT_REMOTE_CHECK_INTERVAL > 0 ))
            then
                # echo "업데이트한지 5분 지남"
                # 생각해보니 또 enter 쳐도 반복되면 안되니 바로 touch 한번 해주고
                touch $FETCH_HEAD
                STATUS_MARKS+="$GIT_REMOTE_FETCH_SYMBOL "

                # 현재 repo 의 remote
                local REMOTE_URL=$($GIT_ENGLISH config --get remote.origin.url 2>/dev/null)

                # git ls-remote --get-url
                if [[ $REMOTE_URL =~ git@.* ]]
                then
                    local REMOTE_HOST=`expr "$REMOTE_URL" : '.*@\([^/:]*\)'`
                else
                    local REMOTE_HOST=`expr "$REMOTE_URL" : '.*//\([^/]*\)'`
                fi

                {
                    if wget --quiet -T 1 -t 1 --spider ${REMOTE_HOST} >/dev/null
                    then
                        $GIT_ENGLISH fetch --quiet --prune >/dev/null
                    fi
                } > /dev/null 2>&1 & disown

            else
                # echo "5분 이내 업데이트한 상황.."

                # how many commits local branch is ahead/behind of remote?
                local STATUS="$($GIT_ENGLISH status --porcelain --branch | grep '^##' | grep -o '\[.\+\]$')"
                local AHEAD_N="$(echo $STATUS | grep -o 'ahead [[:digit:]]\+' | grep -o '[[:digit:]]\+')"
                local BEHIND_N="$(echo $STATUS | grep -o 'behind [[:digit:]]\+' | grep -o '[[:digit:]]\+')"
                [ -n "$AHEAD_N" ] && STATUS_MARKS+="$GIT_NEED_PUSH_SYMBOL $AHEAD_N "
                [ -n "$BEHIND_N" ] && STATUS_MARKS+="$GIT_NEED_PULL_SYMBOL $BEHIND_N "
            fi
        else
            # echo "리모트 없는 로컬 프로젝트"
            STATUS_MARKS+="$GIT_NO_REMOTE_SYMBOL "
        fi

        # print the git branch segment without a trailing newline
        printf "$GIT_BRANCH_SYMBOL $CURRENT_BRANCH $STATUS_MARKS"
    }

    # PS1 환경변수에 쉘 형태를 정의 가능
    # http://webdir.tistory.com/105
    ps1() {
        # Check the exit code of the previous command and display different
        # colors in the prompt accordingly.
        if [ $? -eq 0 ]; then
            local FG_EXIT="$FG_BLACK"
        else
            local FG_EXIT="$FG_RED"
        fi

        local GIT_STATUS="$(git_status)"
        local CURRENT_PATH="$BG_YELLOW$FG_WHITE \w "
        local CURRENT_EXIT="$FG_EXIT$PS_SYMBOL "
        local EDGE="$RESET$FG_GRAY$SYMBOL_ARROW $RESET"

        if [[ -n $GIT_STATUS ]]; then
            local PATH_GIT_BRIDGE="$RESET$FG_YELLOW$BG_BLUE$SYMBOL_ARROW "
            local CURRENT_GIT_STATUS="$FG_BLACK$GIT_STATUS "
            local GIT_EXIT_BRIDGE="$RESET$FG_BLUE$BG_GRAY$SYMBOL_ARROW "
            PS1="\n$CURRENT_PATH$PATH_GIT_BRIDGE$CURRENT_GIT_STATUS$GIT_EXIT_BRIDGE$CURRENT_EXIT$EDGE"
        else
            local PATH_EDGE_BRIDGE="$RESET$FG_YELLOW$BG_GRAY$SYMBOL_ARROW "
            PS1="$CURRENT_PATH$PATH_EDGE_BRIDGE$CURRENT_EXIT$EDGE"
        fi
    }

    # 프롬프트마다 실행할 함수를 지정
    PROMPT_COMMAND=ps1
}

powerline
unset powerline