Bashrc - PS1 customization, git aliases and clone function

.bashrc

# @gf3’s Sexy Bash Prompt, inspired by “Extravagant Zsh Prompt”
# Shamelessly copied from https://github.com/gf3/dotfiles

default_username='marv'

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

if tput setaf 1 &> /dev/null; then
	tput sgr0
	if [[ $(tput colors) -ge 256 ]] 2>/dev/null; then
		MAGENTA=$(tput setaf 9)
		ORANGE=$(tput setaf 172)
		GREEN=$(tput setaf 190)
		PURPLE=$(tput setaf 141)
		WHITE=$(tput setaf 256)
	else
		MAGENTA=$(tput setaf 5)
		ORANGE=$(tput setaf 4)
		GREEN=$(tput setaf 2)
		PURPLE=$(tput setaf 1)
		WHITE=$(tput setaf 7)
	fi
	BOLD=$(tput bold)
	RESET=$(tput sgr0)
else
	MAGENTA="\033[1;31m"
	ORANGE="\033[1;33m"
	GREEN="\033[1;32m"
	PURPLE="\033[1;35m"
	WHITE="\033[1;37m"
	BOLD=""
	RESET="\033[m"
fi

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi

# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

# custom aliases
# clones a repository, cds into it, and opens it in my editor.
# - arg 1 - url|username|repo remote endpoint, username on github, or name of
#           repository.
# - arg 2 - (optional) name of repo
#
# usage:
#   $ clone things
#     .. git clone [email protected]:stephenplusplus/things.git things
#     .. cd things
#     .. subl .
#
#   $ clone [email protected]:stephenplusplus/dots.git
#     .. git clone [email protected]:stephenplusplus/dots.git dots
#     .. cd dots
#     .. subl .
#
#   $ clone yeoman generator
#     .. git clone [email protected]:yeoman/generator.git generator
#     .. cd generator
#     .. subl .
function clone {
  local url=$1;
  local repo=$2;

  if [[ ${url:0:4} == 'http' || ${url:0:3} == 'git' ]]
  then
    # just clone this thing.
    repo=$(echo $url | awk -F/ '{print $NF}' | sed -e 's/.git$//');
  elif [[ -z $repo ]]
  then
    # my own stuff.
    repo=$url;
    url="[email protected]:mendaomn/$repo";
  else
    # not my own, but I know whose it is.
    url="[email protected]:$url/$repo.git";
  fi

  git clone $url $repo && cd $repo && subl .;
}

# 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

function git_info() {
	# check if we're in a git repo
	git rev-parse --is-inside-work-tree &>/dev/null || return

	# quickest check for what branch we're on
	branch=$(git symbolic-ref -q HEAD | sed -e 's|^refs/heads/||')

	# check if it's dirty (via github.com/sindresorhus/pure)
	dirty=$(git diff --quiet --ignore-submodules HEAD &>/dev/null; [ $? -eq 1 ]&& echo -e "*")

	echo $WHITE" on "$PURPLE$branch$dirty
}

# Only show username/host if not default
function usernamehost() {
	if [ $USER != $default_username ]; then echo "${MAGENTA}$USER ${WHITE}at ${ORANGE}$HOSTNAME $WHITEin "; fi
}

# iTerm Tab and Title Customization and prompt customization
# http://sage.ucsc.edu/xtal/iterm_tab_customization.html

# Put the string " [bash]   hostname::/full/directory/path"
# in the title bar using the command sequence
# \[\e]2;[bash]   \h::\]$PWD\[\a\]

# Put the penultimate and current directory
# in the iterm tab
# \[\e]1;\]$(basename $(dirname $PWD))/\W\[\a\]

PS1="\[\e]2;$PWD\[\a\]\[\e]1;\]$(basename "$(dirname "$PWD")")/\W\[\a\]${BOLD}\$(usernamehost)\[$GREEN\]\w\$(git_info)\[$WHITE\]\n\$ \[$RESET\]"
. /usr/share/autojump/autojump.sh

alias  gls='git log --pretty=format:"%C(reset)%h %C(yellow)%ad%C(yellow)%d %C(reset)%s%C(green) [%cn]" --decorate --date=short'
alias   ga='git add'
alias   gp='git push'
alias   gl='git log --name-status'
alias   gst='git status'
alias   gcm='git commit -m'
alias   gb='git branch'
alias   gc='git checkout'