MyBash/ps1.rc.sh

# define symbols
declare -A symbols=(
    [hard_separator]=""
    [soft_separator]="|"
    [git]=""
    [lock]=""
    [flag]="⚑"
    [plus]="✚"
    [tick]="✔"
    [cross]="✘"
    [enter]="⏎"
    [python]="λ"
    [battery_charging]="⚡"
    [battery_discharging]="▮"
    [untracked]="U"
    [stash]="🐿"
    [ahead]="+"
    [behind]="-"
    [smilie]="^_^"
    [frownie]="O_o"
)

last_section_bg=

# $1 - Text (FG) color of new section
# $2 - BG of new section
function section_separator() {
    if [ "$2" = "$last_section_bg" ]; then
	PS1+="$(_CC ${BLACK} ${2})${symbols[soft_separator]}"
    else
	if [ "$2" ]; then
	    PS1+="$(_CC $(_CBG2FG ${last_section_bg}) ${2})${symbols[hard_separator]}"
	else
	    #echo "${last_section_bg} GAH!"
	    PS1+="${NORMAL}$(_CFG $(_CBG2FG ${last_section_bg}) )${symbols[hard_separator]}${NORMAL}"
	fi
    fi
}

# $1 - Content
# $2 - Text (FG) color
# $3 - BG Color
function section(){
    if [ "$last_section_bg" ]; then
	section_separator ${2} ${3}
    fi
    last_section_bg=$3
    PS1+="$(_CC ${2} ${3} ${4})${1}"
}


# This function was modified from one found @ https://www.reddit.com/r/linux/comments/2uf5uu/this_is_my_bash_prompt_which_is_your_favorite/?st=jikgswh4&sh=371ba8bf
# $1 - Default text (foreground) color
# $2 - Background color
function section_git_status() {
    local default untracked stash clean ahead behind staged dirty diverged
    default=$(_CC $1 $2)
    untracked=$(_CC $GREEN $2)
    stash=$(_CC $GREEN $2)
    clean=$(_CC $GREEN $2)
    ahead=$(_CC $YELLOW $2)
    behind=$(_CC $YELLOW $2)
    staged=$(_CC $CYAN $2)
    dirty=$(_CC $RED $2)
    diverged=$(_CC $RED $2)

    branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
    if [[ -n "$branch" ]]; then
	if [ "$last_section_bg" ]; then
	    section_separator $1 $2
	fi
	last_section_bg=$2
	
	PS1+="${default}  ${symbols[git]} $branch "
	git_status=$(git status 2> /dev/null)
	# If nothing changes the color, we can spot unhandled cases.
	if [[ $git_status =~ 'Untracked files' ]]; then
	    PS1+="${symbols[untracked]}"
	fi
	if git stash show &>/dev/null; then
	    PS1+="${symbols[stash]}"
	fi
	if [[ $git_status =~ 'Your branch is ahead' ]]; then
	    PS1+="${symbols[ahead]}"
	fi
	if [[ $git_status =~ 'Your branch is behind' ]]; then
	    PS1+="${symbols[behind]}"
	fi
	if [[ $git_status =~ 'Changes to be committed' ]]; then
	    PS1+="${symbols[tick]}"
	fi
	if [[ $git_status =~ 'Changed but not updated' ||
		    $git_status =~ 'Changes not staged'      ||
		    $git_status =~ 'Unmerged paths' ]]; then
	    PS1+="${symbols[cross]}"
	fi
	if [[ $git_status =~ 'Your branch'.+diverged ]]; then
	    PS1+="${symbols[enter]}"
	fi
	PS1+="  "
    fi
}

# $1 - FG local
# $2 - BG User
# $3 - FG Remote
# $4 - BG Root
section_tty () {
    local TTY=`ps aux | grep $$ | grep bash | awk '{ print $7 }'`
    local SESS_SRC=`who | grep $TTY | awk '{ print $6 }'`
    local USR=0 # 0 = User | 1 = Root
    local FG=$1
    local BG=$2

    # Okay...Now who we be?
    if [ `/usr/bin/whoami` = "root" ] ; then
	USR=1
	BG=$4
    fi

    SSH_IP=`echo $SSH_CLIENT | awk '{ print $1 }'`
    if [ $SSH_IP ] ; then
	FG=$3
    else
	SSH_IP=`echo $SSH2_CLIENT | awk '{ print $1 }'`
	if [ $SSH_IP ]; then
	    FG=$3
	fi
    fi

    if [ "$last_section_bg" ]; then
	section_separator $1 $2
    fi
    last_section_bg=$2
    PS1+="$(_CC $FG $BG)  ${TTY}  "
}


short_PWD ()
{
    local PRE= NAME="$1" LENGTH="$2";
    [[ "$NAME" != "${NAME#$HOME/}" || -z "${NAME#$HOME}" ]] &&
        PRE+='~' NAME="${NAME#$HOME}" LENGTH=$[LENGTH-1];
    ((${#NAME}>$LENGTH)) && NAME="/...${NAME:$[${#NAME}-LENGTH+4]}";
    echo "$PRE$NAME"
}


set_prompt() {
    local lec="$?"
    local color=$GREEN
    local bg=$BG_LBLUE
    local smilie="  ${symbols[smilie]}  "
    if [ $COLOR_PROMPT = yes ]; then
	if [ $lec -ne 0 ]; then
	    color=$RED
	    smilie="  ${symbols[frownie]}  "
	fi
	PS1="${debian_chroot:+($debian_chroot)}" #$(_CC $GREEN $BG_DGREY)\u $(_CC $LBLUE $BG_DGREY)\w$(_CC $DEFAULT $BG_DGREY)|${smilie}$(_CC $DEFAULT $BG_DGREY)|$(_git_status)${NORMAL}$(_CFG $DGREY)${symbols[hard_separator]}${NORMAL} "
	section $smilie $color $BG_BLACK 1
	section_tty $BLACK $BG_LBLUE $RED $BG_YELLOW
	section " \u@\h " $BLUE $BG_LCYAN
	section " $(short_PWD $PWD 20) " $LCYAN $BG_BLUE
	section_git_status $YELLOW $BG_LBLUE
	section_separator
	unset last_section_bg
    else
	PS1="${debian_chroot:+($debian_chroot)}\u@\h:\w\$ "
    fi
}

PROMPT_COMMAND="set_prompt; $PROMPT_COMMAND"