Bash Powerline

.bash-powerline

#!/usr/bin/env bash

## Uncomment to disable git info
#POWERLINE_GIT=0

__powerline() {
    # Colorscheme
    readonly RESET='\[\033[m\]'
    readonly COLOR_CWD='\[\033[0;34m\]' # blue
    readonly COLOR_GIT='\[\033[0;36m\]' # cyan
    readonly COLOR_SUCCESS='\[\033[31m\]' # green
    readonly COLOR_FAILURE='\[\033[95m\]' # red
    readonly RED="\[\033[31m\]"
    readonly GREEN="\[\033[32m\]"
    readonly BOLD="\[\033[1m\]"
    readonly YELLOW="\[\033[33m\]"

    readonly SYMBOL_GIT_BRANCH='⑂'
    readonly SYMBOL_GIT_MODIFIED='*'
    readonly SYMBOL_GIT_PUSH='↑'
    readonly SYMBOL_GIT_PULL='↓'

    if [[ -z "$PS_SYMBOL" ]]; then
      case "$(uname)" in
          Darwin)   PS_SYMBOL='';;
          Linux)    PS_SYMBOL='>>';;
          *)        PS_SYMBOL='%';;
      esac
    fi
	free_percent()
	{
		res=$(free |grep Mem|cut -d: -f2|tr -s '[:blank:]'|sed 's/^ //g'|sed 's/ $//g')
		freed=$(echo $res|cut -d' ' -f3)
		cached=$(echo $res|cut -d' ' -f5)
		avail=$((freed+cached))
		total=$(echo $res|cut -d' ' -f1)
		echo "scale=2;($avail/$total)*100"|bc|sed -e 's/0*$//'|sed -e 's/\.$//'|tr -d [[:space:]]
	}
	function nonzero_return() {
		RETVAL=$?
		[ $RETVAL -ne 0 ] && echo -e "\e[31m-($RETVAL)"
	}
	function parse_git_dirty() {
		status=`git status 2>&1 | tee`
		dirty=`echo -n "${status}" 2> /dev/null | grep "modified:" &> /dev/null; echo "$?"`
		untracked=`echo -n "${status}" 2> /dev/null | grep "Untracked files" &> /dev/null; echo "$?"`
		newfile=`echo -n "${status}" 2> /dev/null | grep "new file:" &> /dev/null; echo "$?"`
		renamed=`echo -n "${status}" 2> /dev/null | grep "renamed:" &> /dev/null; echo "$?"`
		deleted=`echo -n "${status}" 2> /dev/null | grep "deleted:" &> /dev/null; echo "$?"`
		bits=''
		if [ "${renamed}" == "0" ]; then
			bits="r${bits}"
		fi
		if [ "${newfile}" == "0" ]; then
			bits="+${bits}"
		fi
		if [ "${untracked}" == "0" ]; then
			bits="?${bits}"
		fi
		if [ "${deleted}" == "0" ]; then
			bits="-${bits}"
		fi
		if [ ! "${bits}" == "" ]; then
			echo "${bits}"
		else
			echo ""
		fi
	}
    __git_info() {
        [[ $POWERLINE_GIT = 0 ]] && return # disabled
        hash git 2>/dev/null || return # git not found
        local git_eng="env LANG=C git"   # force git output in English to make our work easier

        # get current branch name
        local ref=$($git_eng symbolic-ref --short HEAD 2>/dev/null)

        if [[ -n "$ref" ]]; then
            # prepend branch symbol
            ref="$ref $SYMBOL_GIT_BRANCH"
        else
            # get tag name or short unique hash
            ref=$($git_eng describe --tags --always 2>/dev/null)
        fi

        [[ -n "$ref" ]] || return  # not a git repo

        local marks

        # scan first two lines of output from `git status`
        while IFS= read -r line; do
            if [[ $line =~ ^## ]]; then # header line
                [[ $line =~ ahead\ ([0-9]+) ]] && marks+="${BASH_REMATCH[1]}$SYMBOL_GIT_PUSH"
                [[ $line =~ behind\ ([0-9]+) ]] && marks+="${BASH_REMATCH[1]}$SYMBOL_GIT_PULL"
            else # branch is modified if output contains more lines after the header line
                marks="$SYMBOL_GIT_MODIFIED$marks`parse_git_dirty`"
                break
            fi
        done < <($git_eng status --porcelain --branch 2>/dev/null)  # note the space between the two <

        # print the git branch segment without a trailing newline
        echo -n "-[$ref$marks]"
    }

    ps1() {
        # Check the exit code of the previous command and display different
        # colors in the prompt accordingly.
        if [ $? -eq 0 ]; then
            local symbol="$COLOR_SUCCESS$PS_SYMBOL$RESET"
        else
            local symbol="$COLOR_FAILURE$PS_SYMBOL$RESET"
        fi

        local cwd="$COLOR_CWD\W$RESET"
        # Bash by default expands the content of PS1 unless promptvars is disabled.
        # We must use another layer of reference to prevent expanding any user
        # provided strings, which would cause security issues.
        # POC: https://github.com/njhartwell/pw3nage
        # Related fix in git-bash: https://github.com/git/git/blob/9d77b0405ce6b471cb5ce3a904368fc25e55643d/contrib/completion/git-prompt.sh#L324
        if shopt -q promptvars; then
            __powerline_git_info="$(__git_info)"
            local git="$COLOR_GIT\${__powerline_git_info}$RESET"
        else
            # promptvars is disabled. Avoid creating unnecessary env var.
            local git="$COLOR_GIT$(__git_info)$RESET"
        fi
        PS1="$RED┌───=[$RESET$GREEN$BOLD\u$RED::$RESET$YELLOW$BOLD\h$RESET$RED]$RESET\`nonzero_return\`$RED$git$RED-[$RESET${RED}\$(/usr/bin/tty | /bin/sed -e 's:/dev/::'|sed 's/\//:/')$RED]\n├────[$RESET${YELLOW}jobs:$RESET\j$RED]-[${YELLOW}Ram:$RESET\$(free_percent)%$RED]-[$RESET$cwd$RED]\n$RED└─$symbol$RESET "
    }

    PROMPT_COMMAND="ps1${PROMPT_COMMAND:+; $PROMPT_COMMAND}"
}

__powerline
unset __powerline