.bashrc

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
*i*) ;;
*) return ;;
esac

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
xterm-color | *-256color) color_prompt=yes ;;
esac

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
        # We have color support; assume it's compliant with Ecma-48
        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
        # a case would tend to support setf rather than setaf.)
        color_prompt=yes
    else
        color_prompt=
    fi
fi

# Adds the current branch to the bash prompt when the working directory is
# part of a Git repository. Includes color-coding and indicators to quickly
# indicate the status of working directory.
#
# From https://askubuntu.com/a/851407/933983

git_branch() {
    # -- Finds and outputs the current branch name by parsing the list of
    #    all branches
    # -- Current branch is identified by an asterisk at the beginning
    # -- If not in a Git repository, error message goes to /dev/null and
    #    no output is produced
    git branch --no-color 2>/dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'
}

git_status() {
    # Outputs a series of indicators based on the status of the
    # working directory:
    # + changes are staged and ready to commit
    # ! unstaged changes are present
    # ? untracked files are present
    # S changes have been stashed
    # P local commits need to be pushed to the remote
    local status="$(git status --porcelain 2>/dev/null)"
    local output=''
    [[ -n $(egrep '^[MADRC]' <<<"$status") ]] && output="$output+"
    [[ -n $(egrep '^.[MD]' <<<"$status") ]] && output="$output!"
    [[ -n $(egrep '^\?\?' <<<"$status") ]] && output="$output?"
    [[ -n $(git stash list) ]] && output="${output}S"
    [[ -n $(git log --branches --not --remotes) ]] && output="${output}P"
    echo $output
}

git_color() {
    # Receives output of git_status as argument; produces appropriate color
    # code based on status of working directory:
    # - White if everything is clean
    # - Green if all changes are staged
    # - Red if there are uncommitted changes with nothing staged
    # - Yellow if there are both staged and unstaged changes
    local staged=$([[ $1 =~ \+ ]] && echo yes)
    local dirty=$([[ $1 =~ [!\?] ]] && echo yes)
    if [[ -n $staged ]] && [[ -n $dirty ]]; then
        echo -e '\e[1;33m' # bold yellow
    elif [[ -n $staged ]]; then
        echo -e '\e[1;32m' # bold green
    elif [[ -n $dirty ]]; then
        echo -e '\e[1;31m' # bold red
    else
        echo -e '\e[1;37m' # bold white
    fi
}

git_prompt() {
    # First, get the branch name...
    local branch=$(git_branch)
    # Empty output? Then we're not in a Git repository, so bypass the rest
    # of the function, producing no output
    if [[ -n $branch ]]; then
        local state=$(git_status)
        local color=$(git_color $state)
        # Now output the actual code to insert the branch and status
        if [[ -z "$state" ]]; then
            echo -e "[\x01$color\x02$branch\x01\e[0m\x02]" # last bit resets color
        else                                               # separate from branch name
            echo -e "[\x01$color\x02$branch\x01\e[0m\x02|\x01$color\x02$state\x01\e[0m\x02]"
        fi
    fi
}

if [ "$color_prompt" = yes ]; then
    # Highlight the user name when logged in as root.
    # Inspired by Parrot OS
    # Color codes from https://misc.flogisoft.com/bash/tip_colors_and_formatting
    if [[ "${EUID}" = 0 ]]; then
        PS1='${debian_chroot:+($debian_chroot)}\n\e[07m\t\e[0m \[\e[01;31m\]\u\e[0m\[\e[33m\]@\[\e[01;32m\]\h\[\e[0m\]:\[\e[34m\]\w\[\e[0m\] $(git_prompt)\n\[\e[31m\]\342\224\224\342\224\200\342\224\200\342\225\274\[\e[0m\] \[\e[01;33m\]\$\[\e[0m\]' # Red
    else
        PS1='${debian_chroot:+($debian_chroot)}\n\e[07m\t\e[0m \u\[\e[33m\]@\[\e[01;32m\]\h\[\e[0m\]:\[\e[34m\]\w\[\e[0m\] $(git_prompt)\n\[\e[31m\]\342\224\224\342\224\200\342\224\200\342\225\274\[\e[0m\] \[\e[01;33m\]\$\[\e[0m\]' # white
    fi
else
    PS1='${debian_chroot:+($debian_chroot)}\t \u@\h:\w $(git_prompt)\n└──╼ \$'
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm* | rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*) ;;

esac

# colored GCC warnings and errors
export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
    if [ -f /usr/share/bash-completion/bash_completion ]; then
        . /usr/share/bash-completion/bash_completion
    elif [ -f /etc/bash_completion ]; then
        . /etc/bash_completion
    fi
fi