My custom bash environment

bash_prompt.sh

#!/bin/bash
# Ngo Duy Khanh
# Email: ngokhanhit[at]gmail.com
# Website: tips4admin.com
#
# DESCRIPTION:
#
#   Set the bash prompt according to:
#    * the active virtualenv
#    * the branch/status of the current git repository
#    * the return value of the previous command
#    * the fact you just came from Windows and are used to having newlines in
#      your prompts.
#
# USAGE:
#
#   1. Save this file as ~/.dotfiles/source/bash_prompt.sh
#   2. Add the following line to the end of your ~/.bashrc or ~/.bash_profile:
#        . ~/.dotfiles/source/bash_prompt.sh
#
# LINEAGE:
#
#   Based on work by woods
#
#   https://gist.github.com/31967
 
# The various escape codes that we can use to color our prompt.

        RED="\[\033[0;31m\]"
     YELLOW="\[\033[1;33m\]"
      GREEN="\[\033[0;32m\]"
       BLUE="\[\033[1;34m\]"
  LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
      WHITE="\[\033[1;37m\]"
 LIGHT_GRAY="\[\033[0;37m\]"
 COLOR_NONE="\[\e[0m\]"
 
# Detect whether the current directory is a git repository.
function is_git_repository {
  git branch > /dev/null 2>&1
}
 
# Determine the branch/state information for this git repository.
function set_git_branch {
  # Capture the output of the "git status" command.
  git_status="$(git status 2> /dev/null)"
 
  # Set color based on clean/staged/dirty.
  if [[ ${git_status} =~ "working directory clean" ]]; then
    state="${GREEN}"
  elif [[ ${git_status} =~ "Changes to be committed" ]]; then
    state="${YELLOW}"
  else
    state="${LIGHT_RED}"
  fi
 
  # Set arrow icon based on status against remote.
  remote_pattern="Your branch is (.*) of"
  if [[ ${git_status} =~ ${remote_pattern} ]]; then
    if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
      remote="↑"
    else
      remote="↓"
    fi
  else
    remote=""
  fi
  diverge_pattern="Your branch and (.*) have diverged"
  if [[ ${git_status} =~ ${diverge_pattern} ]]; then
    remote="↕"
  fi
 
  # Get the name of the branch.
  #branch_pattern="^# On branch ([^${IFS}]*)"
  branch_pattern="On branch ([^${IFS}]*)"
  if [[ ${git_status} =~ ${branch_pattern} ]]; then
    branch=${BASH_REMATCH[1]}
  fi
 
  # Set the final branch string.
  BRANCH="${state}(${branch})${remote}${COLOR_NONE} "
}
 
# Return the prompt symbol to use, colorized based on the return value of the
# previous command.
function set_prompt_symbol () {
  if test $1 -eq 0 ; then
    if [[ "$USER" == "root" ]]; then
      # logged in as root
      PROMPT_SYMBOL="${GREEN}[$(date +"%H$c1:$c0%M$c1:$c0%S")] ${COLOR_NONE}#"
    else
      PROMPT_SYMBOL="${GREEN}[$(date +"%H$c1:$c0%M$c1:$c0%S")] ${COLOR_NONE}\$"
    fi
  else
    if [[ "$USER" == "root" ]]; then
      # logged in as root
      PROMPT_SYMBOL="${GREEN}[$(date +"%H$c1:$c0%M$c1:$c0%S")] ${LIGHT_RED}#${COLOR_NONE}"
    else
      PROMPT_SYMBOL="${GREEN}[$(date +"%H$c1:$c0%M$c1:$c0%S")] ${LIGHT_RED}\$${COLOR_NONE}"
    fi      
  fi
}
 
# Determine active Python virtualenv details.
function set_virtualenv () {
  if test -z "$VIRTUAL_ENV" ; then
      PYTHON_VIRTUALENV=""
  else
      PYTHON_VIRTUALENV="${BLUE}[`basename \"$VIRTUAL_ENV\"`]${COLOR_NONE} "
  fi
}

# Set the full bash prompt.
function set_bash_prompt () {
  # Set the PROMPT_SYMBOL variable. We do this first so we don't lose the
  # return value of the last command.
  set_prompt_symbol $?
 
  # Set the PYTHON_VIRTUALENV variable.
  set_virtualenv
 
  # Set the BRANCH variable.
  if is_git_repository ; then
    set_git_branch
  else
    BRANCH=''
  fi
 
  # Set the bash prompt variable.
  PS1="
${PYTHON_VIRTUALENV}[${GREEN}\u@\h ${YELLOW}\w${COLOR_NONE}] ${BRANCH}
${PROMPT_SYMBOL} "
}
 
# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt

# Short compress / extract command
extract () {
     if [ -f $1 ] ; then
         case $1 in
             *.tar.bz2)   tar xjf $1      ;;
             *.tar.gz)    tar xzf $1      ;;
             *.bz2)       bunzip2 $1      ;;
             *.rar)       rar x $1        ;;
             *.gz)        gunzip $1       ;;
             *.tar)       tar xf $1       ;;
             *.tbz2)      tar xjf $1      ;;
             *.tgz)       tar xzf $1      ;;
             *.zip)       unzip $1        ;;
             *.Z)         uncompress $1   ;;
             *.7z)        7z x $1         ;;
             *)           echo "Error: $1 is not a valid compression type" ;;
         esac
     else
         echo "'$1' is not a valid archive"
     fi
}

compress () {
    if [[ -f $2 || -d $2 ]] ; then
         case $1 in
             *.tar.bz2)   tar -cjvhf $1 $2  ;;
             *.tar.gz)    tar -czvhf $1 $2  ;;
             *.bz2)       bzip2 $1 $2       ;;
             *.gz)        gzip $1 $2        ;;
             *.tar)       tar -chf $1 $2    ;;
             *.tbz2)      tar -cjhf $1 $2   ;;
             *.tgz)       tar -czhf $1 $2   ;;
             *.zip)       zip $1 $2         ;;
             *.7z)        7z a -t7z $1 $2   ;;
             *)           echo "Error: $2 is not a valid compression type" ;;
         esac
     else
         echo "Error: $2 does not exist"
     fi
}

pushd()
{
  if [ $# -eq 0 ]; then
    DIR="${HOME}"
  else
    DIR="$1"
  fi

  builtin pushd "${DIR}" > /dev/null
  # echo -n "DIRSTACK: "
  # dirs
}

pushd_builtin()
{
  builtin pushd > /dev/null
  # echo -n "DIRSTACK: "
  # dirs
}

popd()
{
  builtin popd > /dev/null
  # echo -n "DIRSTACK: "
  # dirs
}

alias cd='pushd'
alias back='popd'
alias flip='pushd_builtin'

# Use virtualenvwrapper
if [ -f /usr/local/bin/virtualenvwrapper.sh ]
then
  export WORKON_HOME="$HOME/.virtualenvs"
  source /usr/local/bin/virtualenvwrapper.sh
fi

# xclip
# A shortcut function that simplifies usage of xclip.
# - Accepts input from either stdin (pipe), or params.
# ------------------------------------------------
cb() {
  local _scs_col="\e[0;32m"; local _wrn_col='\e[1;31m'; local _trn_col='\e[0;33m'
  # Check that xclip is installed.
  if ! type xclip > /dev/null 2>&1; then
    echo -e "$_wrn_col""You must have the 'xclip' program installed.\e[0m"
  # Check user is not root (root doesn't have access to user xorg server)
  elif [[ "$USER" == "root" ]]; then
    echo -e "$_wrn_col""Must be regular user (not root) to copy a file to the clipboard.\e[0m"
  else
    # If no tty, data should be available on stdin
    if ! [[ "$( tty )" == /dev/* ]]; then
      input="$(< /dev/stdin)"
    # Else, fetch input from params
    else
      input="$*"
    fi
    if [ -z "$input" ]; then  # If no input, print usage message.
      echo "Copies a string to the clipboard."
      echo "Usage: cb <string>"
      echo "       echo <string> | cb"
    else
      # Copy input to clipboard
      echo -n "$input" | xclip -selection c
      # Truncate text for status
      if [ ${#input} -gt 80 ]; then input="$(echo $input | cut -c1-80)$_trn_col...\e[0m"; fi
      # Print status.
      echo -e "$_scs_col""Copied to clipboard:\e[0m $input"
    fi
  fi
}
# Aliases / functions leveraging the cb() function
# ------------------------------------------------
# Copy contents of a file
function cbf() { cat "$1" | cb; }
# Copy SSH public key
alias cbssh="cbf ~/.ssh/id_rsa.pub"
# Copy current working directory
alias cbwd="pwd | cb"
# Copy most recent command in bash history
alias cbhs="cat $HISTFILE | tail -n 1 | cb"