Zbar

Zbar ! Small but cute terminal prompt

#!/usr/bin/env bash
#
# Instruction :
# - Save this file locally
# - Open terminal
# - execute command "source </path/to/this/file>
# - To get the smallest possible promt, execute "zbar 0"
# - Otherwise, execute command "zbar"
#
 
gen_z_prompt () {

    readonly Z_RED_COLOR="\[$(tput setaf 1)\]"
    readonly Z_GREEN_COLOR="\[$(tput setaf 2)\]"
    readonly Z_YELLOW_COLOR="\[$(tput setaf 3)\]"
    readonly Z_BLUE_COLOR="\[$(tput setaf 4)\]"
    readonly Z_RESET_COLOR="\[$(tput sgr0)\]"

    function zbar_gen_dir () {
        local DIR=${Z_RED_COLOR}
        DIR+=$(pwd | sed 's/\/.*\///')
        DIR+=${Z_RESET_COLOR}
        echo ${DIR}
    }

    function zbar_is_git () {
        git log -1 2>/dev/null 1>&2
    }

    function zbar_gen_git () {
        zbar_is_git \
        && (\
        echo "${Z_YELLOW_COLOR}$(\
            basename `git rev-parse --show-toplevel`\
            )${Z_BLUE_COLOR}:${Z_GREEN_COLOR}$(\
            git branch | grep "*" | sed 's/\*\s\+//'\
            )${Z_RESET_COLOR}") \
        || echo ""
    }

    function zbar_gen_dot () {
        local lastExitStatus=$1
        $(exit ${lastExitStatus}) && local SYMBOL=${Z_GREEN_COLOR} || local SYMBOL=${Z_RED_COLOR}
        SYMBOL+=$'\u25cf'
        SYMBOL+=${Z_RESET_COLOR}
        echo ${SYMBOL}
    }

    function zbar_ranger_shell () {
        if [[ ! -z $RANGER_LEVEL ]]; then
            echo "${Z_YELLOW_COLOR}(ranger)${Z_RESET_COLOR} "
        fi
    }

    function zbar_python_venv () {
        if [[ ! -z $VIRTUAL_ENV ]] ; then
            echo "${Z_YELLOW_COLOR}(venv)${Z_RESET_COLOR} "
        fi
    }

    function zbar-dir-git-gen () {
        local lastExitStatus=$?
        PS1="$(zbar_ranger_shell)$(zbar_python_venv)$(zbar_gen_dir) $(zbar_gen_dot ${lastExitStatus}) "
        $(zbar_is_git) && PS1+="$(zbar_gen_git) $(zbar_gen_dot ${lastExitStatus}) "
    }

    zbar-gen () {
        local lastExitStatus=$?
        PS1="$(zbar_python_venv)$(zbar_gen_dot ${lastExitStatus}) "
    }

    function zbar() {
        if [ "$1" == "0" ]; then
            PROMPT_COMMAND=zbar-gen
        else
            PROMPT_COMMAND=zbar-dir-git-gen
        fi
    }
}
gen_z_prompt
unset gen_z_prompt