Powerline-style bash prompt

intro.md

Custom bash prompt

Requires a patched powerline font (see https://gist.github.com/baopham/1838072 or https://github.com/Lokaltog/powerline-fonts).

Screenshot using the smyck theme.

ps1.sh

_ps1_clear() {
    echo -n "\e[0m"
}
_ps1_fg() {
    echo -n "\e[38;5;$1m"
}
_ps1_bg() {
    echo -n "\e[48;5;$1m"
}
_ps1_jobs() {
    if [ `jobs | wc -l` -gt 0 ]; then
        echo -n "$(_ps1_fg 229)\j⃣"
    fi
}
_ps1_star() {
    echo -n "$(_ps1_fg $(($RANDOM % 255)))✭"
}
_parse_git_branch() {
    if [[ `git status 2> /dev/null` == *nothing\ to\ commit* ]]; then _ps1_fg 99; else _ps1_fg 32; fi
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
_update_ps1() {
    local parts=(
        "\n$(_ps1_clear)$(_ps1_bg 236)$(_ps1_fg 236)"
        "$(_ps1_fg 246)\w"
        "$(_parse_git_branch)"
        "$(_ps1_clear)$(_ps1_fg 236) $(_ps1_jobs)"
        "\n$(_ps1_star)  $(_ps1_clear)"
    )
    export PS1="${parts[@]}"
}
 
export PROMPT_COMMAND="_update_ps1"