.bash_prompt

#!/usr/bin/env bash

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}${2}${s}";
    else
        return;
    fi;
}

# Escape codes for coloring bash prompt
red="\[\033[0;31m\]"
yellow="\[\033[1;33m\]"
green="\[\033[0;32m\]"
blue="\[\033[1;34m\]"
magenta="\[\033[1;35m\]"
cyan="\[\033[1;36m\]"
light_red="\[\033[1;31m\]"
light_green="\[\033[1;32m\]"
white="\[\033[1;37m\]"
light_gray="\[\033[0;37m\]"
reset="\[\e[0m\]"

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

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

# Set the terminal title and prompt.
PS1="\[\033]0;\W\007\]";     # working directory base name
PS1+="\n";                   # newline
PS1+="${userStyle}\u";       # username
PS1+="${reset} at ";         # 'at'
PS1+="${hostStyle}\h";       # host
PS1+="${reset} in ";         # 'in'
PS1+="${magenta}\w";         # working directory full path
PS1+="\$(prompt_git \"\[${reset}\] on \[${light_green}\]\" \"\[${blue}\]\")"; # Git repository details
PS1+="\n";                   # newline
PS1+="${reset}\$ "           # '$'
export PS1;

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