#!/usr/bin/env bash

########################################################################
# bash_prompt, from @mathiasbynens
# slightly modified
# https://github.com/mathiasbynens/dotfiles/blob/master/.bash_prompt
########################################################################

if [[ $COLORTERM = gnome-* && $TERM = xterm ]] && infocmp gnome-256color >/dev/null 2>&1; then
    export TERM='gnome-256color';
elif infocmp xterm-256color >/dev/null 2>&1; then
    export TERM='xterm-256color';
fi;

prompt_git() {
    local s='';
    local branchName='';

    # Check if the current directory is in a Git repository.
    if [ $(git rev-parse --is-inside-work-tree &>/dev/null; echo "${?}") == '0' ]; then

        # check if the current directory is in .git before running git checks
        if [ "$(git rev-parse --is-inside-git-dir 2> /dev/null)" == 'false' ]; then

            # Ensure the index is up to date.
            git update-index --really-refresh -q &>/dev/null;

            # Check for uncommitted changes in the index.
            if ! $(git diff --quiet --ignore-submodules --cached); then
                s+='+';
            fi;

            # Check for unstaged changes.
            if ! $(git diff-files --quiet --ignore-submodules --); then
                s+='!';
            fi;

            # Check for untracked files.
            if [ -n "$(git ls-files --others --exclude-standard)" ]; then
                s+='?';
            fi;

            # Check for stashed files.
            if $(git rev-parse --verify refs/stash &>/dev/null); then
                s+='$';
            fi;

        fi;

        # Get the short symbolic ref.
        # If HEAD isn’t a symbolic ref, get the short SHA for the latest commit
        # Otherwise, just give up.
        branchName="$(git symbolic-ref --quiet --short HEAD 2> /dev/null || \
            git rev-parse --short HEAD 2> /dev/null || \
            echo '(unknown)')";

        [ -n "${s}" ] && s=" ${s}";

        echo -e "${1}${branchName}${orange}${s}";
    else
        return;
    fi;
}

if tput setaf 1 &> /dev/null; then
    tput sgr0; # reset colors
    bold=$(tput bold);
    dim=$(tput setaf 7);
    reset=$(tput sgr0);
    # Tomorrow colors, taken from https://github.com/Slava/vim-colors-tomorrow/blob/master/colors/tomorrow.vim
    black=$(tput setaf 236);
    gray=$(tput setaf 242);
    blue=$(tput setaf 109);
    green=$(tput setaf 143);
    cyan=$(tput setaf 110);
    orange=$(tput setaf 173);
    purple=$(tput setaf 125);
    red=$(tput setaf 167);
    magenta=$(tput setaf 139);
    violet=$(tput setaf 139);
    white=$(tput setaf 15);
    yellow=$(tput setaf 136);
else
    bold='';
    reset="\e[0m";
    black="\e[1;30m";
    blue="\e[1;34m";
    cyan="\e[1;36m";
    green="\e[1;32m";
    orange="\e[1;33m";
    purple="\e[1;35m";
    red="\e[1;31m";
    violet="\e[1;35m";
    white="\e[1;37m";
    yellow="\e[1;33m";
fi;

# Highlight the user name when logged in as root.
if [[ "${USER}" == "root" ]]; then
    userStyle="${red}";
else
    userStyle="${orange}";
fi;

# Highlight the hostname when connected via SSH.
if [[ "${SSH_TTY}" ]]; then
    hostStyle="${bold}${red}";
else
    hostStyle="${yellow}";
fi;

# Set the terminal title to the current working directory.
PS1="\[\033]0;\W\007\]"; # working directory base name
PS1+="\n";
PS1+="\[${cyan}\]\w"; # working directory full path
PS1+="\$(prompt_git \" \[${gray}\]\")"; # Git repository details
PS1+="\n";
PS1+="\[${dim}\]→ \[${reset}\]"; # `→` (and reset color)
export PS1;

PS2="\[${dim}\]→ \[${reset}\]";
export PS2;