From b255959cb81f552ee12b89fbc57df27e470e5efb Mon Sep 17 00:00:00 2001
From: Artem Sapegin <artem@sapegin.ru>
Date: Wed, 20 Feb 2013 18:06:09 +0400
Subject: [PATCH] New awesome minimalistic Bash prompt.

---
 includes/bash_prompt.bash | 105 +++++++++++++++-----------------------
 1 file changed, 40 insertions(+), 65 deletions(-)

diff --git a/includes/bash_prompt.bash b/includes/bash_prompt.bash
index ee550b5..18e5c2a 100644
--- a/includes/bash_prompt.bash
+++ b/includes/bash_prompt.bash
@@ -1,89 +1,64 @@
-# Inspired by: https://github.com/dreadatour/dotfiles/blob/master/.bash_profile
+# Inspired by: https://github.com/dreadatour/dotfiles/blob/master/.bash_profile & https://github.com/sindresorhus/pure
+
+# Add to ~/.bashlocal user name you don’t want to see in the prompt: `local_username="admin"`
 
 # User color
 case $(id -u) in
-	0) USER_COLOR=$RED ;;  # root
-	*) USER_COLOR=$GREEN ;;
+	0) user_color="$RED" ;;  # root
+	*) user_color="$GREEN" ;;
 esac
 
-# Some kind of optimization - check if Git installed only on config load
-PS1_GIT_BIN=$(which git 2>/dev/null)
+# Prompt symbol
+prompt_symbol="❯"
 
 function prompt_command() {
-	local PS1_GIT=
-	local GIT_BRANCH=
-	local GIT_DIRTY=
-	local PWDNAME="$PWD"
-
 	# Local or SSH session?
 	local remote=
 	[ -n "$SSH_CLIENT" ] || [ -n "$SSH_TTY" ] && remote=1
 
-	# Beautify working directory name
+	# Working directory name
+	local dir_name="$PWD"
 	if [ "$HOME" == "$PWD" ]; then
-		PWDNAME="~"
+		dir_name="~"
 	elif [ "$HOME" == "${PWD:0:${#HOME}}" ]; then
-		PWDNAME="~${PWD:${#HOME}}"
+		dir_name="~${PWD:${#HOME}}"
 	fi
 
-	# Parse Git status and get Git variables
-	if [[ ! -z "$PS1_GIT_BIN" ]]; then
-		# Check if we are in Git repo
-		local CUR_DIR="$PWD"
-		while [[ ! -d "$CUR_DIR/.git" ]] && [[ ! "$CUR_DIR" == "/" ]] && [[ ! "$CUR_DIR" == "~" ]] && [[ ! "$CUR_DIR" == "" ]]; do CUR_DIR="${CUR_DIR%/*}"; done
-		if [[ -d "$CUR_DIR/.git" ]]; then
-			# Get Git branch
-			GIT_BRANCH="$($PS1_GIT_BIN symbolic-ref HEAD 2>/dev/null)"
-			if [[ ! -z "$GIT_BRANCH" ]]; then
-				GIT_BRANCH="${GIT_BRANCH#refs/heads/}"
+	# Git branch name and work tree status (only when we are inside Git working tree)
+	local git_prompt=
+	if [[ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]]; then
+		# Branch name
+		local branch="$(git symbolic-ref HEAD 2>/dev/null)"
+		branch="${branch##refs/heads/}"
 
-				# Get Git status
-				local GIT_STATUS="$($PS1_GIT_BIN status --porcelain 2>/dev/null)"
-				[[ -n "$GIT_STATUS" ]] && GIT_DIRTY=1
-			fi
-		fi
+		# Working tree status (red when dirty)
+		local branch_color="$GREEN"
+		git diff --no-ext-diff --quiet --exit-code --ignore-submodules || branch_color="$RED"
+
+		# Format Git info
+		git_prompt=" #$branch_color$branch$NOCOLOR"
 	fi
 
-	# Build B&W prompt for Git
-	[[ ! -z "$GIT_BRANCH" ]] && PS1_GIT=" #$GIT_BRANCH"
+	# Only show username if not default
+	local user_prompt=
+	[ "$USER" != "$local_username" ] && user_prompt="$user_color$USER$NOCOLOR"
 
-	# Calculate prompt length
-	local host_length=0
-	[ -n "$remote" ] && host_length=$((${#HOSTNAME}+1))
-	local PS1_length=$((${#USER}+${#PWDNAME}+${#PS1_GIT}+$host_length+2))
-	local FILL=
-
-	# If length is greater, than terminal width
-	if [[ $PS1_length -gt $COLUMNS ]]; then
-		# Strip working directory name
-		PWDNAME="...${PWDNAME:$(($PS1_length-$COLUMNS+3))}"
-	else
-		# Calculate fillsize
-		local fillsize=$(($COLUMNS-$PS1_length))
-		FILL=$GRAY
-		while [[ $fillsize -gt 0 ]]; do FILL=$FILL"─"; fillsize=$(($fillsize-1)); done
-		FILL=$FILL$NOCOLOR
-	fi
-
-	# Git status for prompt
-	if [ ! -z "$GIT_BRANCH" ]; then
-		local BRANCH_COLOR=$GREEN
-		[ ! -z $GIT_DIRTY ] && BRANCH_COLOR=$RED
-		PS1_GIT=" #$BRANCH_COLOR$GIT_BRANCH$NOCOLOR"
-	fi
-
-	# Set new color prompt
+	# Show hostname inside SSH session
 	local host_prompt=
-	[ -n "$remote" ] && host_prompt="@$YELLOW$HOSTNAME$NOCOLOR" 
-	PS1="$USER_COLOR$USER$NOCOLOR$host_prompt:$WHITE$PWDNAME$NOCOLOR$PS1_GIT $FILL\n→ "
+	[ -n "$remote" ] && host_prompt="@$YELLOW$HOSTNAME$NOCOLOR"
+
+	# Show delimiter if user or host visible
+	local login_delimiter=
+	[ -n "$user_prompt" ] || [ -n "$host_prompt" ] && login_delimiter=":"
+
+	# Format prompt
+	PS1="\n$user_prompt$host_prompt$login_delimiter$WHITE$dir_name$NOCOLOR$git_prompt\n$CYAN$prompt_symbol$NOCOLOR "
 
 	# Terminal title
-	local TITLE=$(basename $PWDNAME)
-	[ -n "$SSH_CLIENT" ] || [ -n "$SSH_TTY" ] && TITLE="$TITLE \xE2\x80\x94 $HOSTNAME"
-	echo -ne "\033]0;$TITLE"; echo -ne "\007"
+	local title="$(basename $dir_name)"
+	[ -n "$remote" ] && title="$title \xE2\x80\x94 $HOSTNAME"
+	echo -ne "\033]0;$title"; echo -ne "\007"
 }
 
-# Set prompt command (title update and color prompt)
-PROMPT_COMMAND=prompt_command
-# Set new B&W prompt (will be overwritten in `prompt_command` later with color prompt)
-PS1='\u@\h:\w\$ '
+# Show awesome prompt only if Git is istalled
+command -v git >/dev/null 2>&1 && PROMPT_COMMAND=prompt_command