Bash configuration with custom prompt, aliases, and some other goodies.

.bashrc

# vim: set ft=sh:
#
# /etc/bash.bashrc.custom
#

## BEGIN ENVIRONMENT VARS

# Add local ruby gems to our PATH. How to add system-wide gems?
export PATH=$PATH:~/.gem/ruby/1.9.1/bin
# proper encoding for the linux terminal (ttys)
if [ "$TERM" = linux ] ; then
	export T3WINDOW_OPTS=acs=utf8
fi

# global node module location
export NODE_PATH=$NODE_PATH:/usr/lib/node_modules:/usr/local/lib/node_modules

## END ENVIRONMENT VARS

##################################################
# Fancy PWD display function
##################################################
# The home directory (HOME) is replaced with a ~
# The last pwdmaxlen characters of the PWD are displayed
# Leading partial directory names are striped off
# /home/me/stuff          -> ~/stuff               if USER=me
# /usr/share/big_dir_name -> ../share/big_dir_name if pwdmaxlen=20
##################################################
export NEW_PWD="Hello there young jedi apprentice."
dynamicPS1() {
    # How many characters of the $PWD should be kept
    local pwdmaxlen=35
    # Indicate that there has been dir truncation
    local trunc_symbol="..."
    local dir=${PWD##*/}
    pwdmaxlen=$(( ( pwdmaxlen < ${#dir} ) ? ${#dir} : pwdmaxlen ))
    NEW_PWD=${PWD/#$HOME/\~}
    local pwdoffset=$(( ${#NEW_PWD} - pwdmaxlen ))
    if [ ${pwdoffset} -gt "0" ]
    then
        NEW_PWD=${NEW_PWD:$pwdoffset:$pwdmaxlen}
        NEW_PWD=${trunc_symbol}/${NEW_PWD#*/}
    fi
    PS1="\n${BRed}┌─[${BGreen}\t${BRed}/${BYellow}\h${BRed}/${BBlue}\u${BRed}${BRed}/${BPurple}${NEW_PWD}${BRed}]${BRed}\n└─╼ ${ColorOff}"
}

## colors
# Reset
ColorOff='\[\e[0m\]'       # Text Reset
BColorOff='\[\e[1;0m\]'       # Text Reset

# Regular Colors
Black='\[\e[0;30m\]'        # Black
Red='\[\e[0;31m\]'          # Red
Green='\[\e[0;32m\]'        # Green
Yellow='\[\e[0;33m\]'       # Yellow
Blue='\[\e[0;34m\]'         # Blue
Purple='\[\e[0;35m\]'       # Purple
Cyan='\[\e[0;36m\]'         # Cyan
White='\[\e[0;37m\]'        # White

# Bold
BBlack='\[\e[1;30m\]'       # Black
BRed='\[\e[1;31m\]'         # Red
BGreen='\[\e[1;32m\]'       # Green
BYellow='\[\e[1;33m\]'      # Yellow
BBlue='\[\e[1;34m\]'        # Blue
BPurple='\[\e[1;35m\]'      # Purple
BCyan='\[\e[1;36m\]'        # Cyan
BWhite='\[\e[1;37m\]'       # White

# Underline
UBlack='\[\e[4;30m\]'       # Black
URed='\[\e[4;31m\]'         # Red
UGreen='\[\e[4;32m\]'       # Green
UYellow='\[\e[4;33m\]'      # Yellow
UBlue='\[\e[4;34m\]'        # Blue
UPurple='\[\e[4;35m\]'      # Purple
UCyan='\[\e[4;36m\]'        # Cyan
UWhite='\[\e[4;37m\]'       # White

# Background
On_Black='\[\e[40m\]'       # Black
On_Red='\[\e[41m\]'         # Red
On_Green='\[\e[42m\]'       # Green
On_Yellow='\[\e[43m\]'      # Yellow
On_Blue='\[\e[44m\]'        # Blue
On_Purple='\[\e[45m\]'      # Purple
On_Cyan='\[\e[46m\]'        # Cyan
On_White='\[\e[47m\]'       # White

# High Intensity
IBlack='\[\e[0;90m\]'       # Black
IRed='\[\e[0;91m\]'         # Red
IGreen='\[\e[0;92m\]'       # Green
IYellow='\[\e[0;93m\]'      # Yellow
IBlue='\[\e[0;94m\]'        # Blue
IPurple='\[\e[0;95m\]'      # Purple
ICyan='\[\e[0;96m\]'        # Cyan
IWhite='\[\e[0;97m\]'       # White

# Bold High Intensity
BIBlack='\[\e[1;90m\]'      # Black
BIRed='\[\e[1;91m\]'        # Red
BIGreen='\[\e[1;92m\]'      # Green
BIYellow='\[\e[1;93m\]'     # Yellow
BIBlue='\[\e[1;94m\]'       # Blue
BIPurple='\[\e[1;95m\]'     # Purple
BICyan='\[\e[1;96m\]'       # Cyan
BIWhite='\[\e[1;97m\]'      # White

# High Intensity backgrounds
On_IBlack='\[\e[0;100m\]'   # Black
On_IRed='\[\e[0;101m\]'     # Red
On_IGreen='\[\e[0;102m\]'   # Green
On_IYellow='\[\e[0;103m\]'  # Yellow
On_IBlue='\[\e[0;104m\]'    # Blue
On_IPurple='\[\e[10;95m\]'  # Purple
On_ICyan='\[\e[0;106m\]'    # Cyan
On_IWhite='\[\e[0;107m\]'   # White


## history settings.
export HISTFILE=~/.bash_history
export HISTFILESIZE=10000
export HISTSIZE=10000
export HISTCONTROL=erasedups
#export HISTTIMEFORMAT="[$(tput setaf 6)%F %T$(tput sgr0)]: "
#export HISTIGNORE=hcln
#shopt -s histappend

## automatic commands executed before each prompt.
export PROMPT_COMMAND="history -a; dynamicPS1; $PROMPT_COMMAND"

## execute a command before every command, including the ones in PROMPT_COMMAND
#trap 'echo "foobar"' DEBUG

## execute a command when the shell exits
trap 'echo "Goodbye!"' EXIT

## GENERAL SHELL OPTIONS
shopt -s checkwinsize # fix line wrap on window resize
shopt -s autocd # Auto "cd" when entering just a pathname
stty -ixon # disable freezing of the terminal when pressing ctrl+s

## Default editor
export EDITOR=vim

## grep color
export GREP_OPTIONS='--color=auto'

## ls color. Color rules can be stored in a file and loaded with dircolors. NOTE: This needs to be changed on different systems.
export `dircolors | sed 's/^.//' | sed 's/..$//'` # sets up the LS_COLORS environment variable for ls with default colors.

## BEGIN aliases and alias functions
## colors for man pages
man() {
  env \
    LESS_TERMCAP_mb=$(printf "\e[1;31m") \
    LESS_TERMCAP_md=$(printf "\e[1;31m") \
    LESS_TERMCAP_me=$(printf "\e[0m") \
    LESS_TERMCAP_se=$(printf "\e[0m") \
    LESS_TERMCAP_so=$(printf "\e[1;44;33m") \
    LESS_TERMCAP_ue=$(printf "\e[0m") \
    LESS_TERMCAP_us=$(printf "\e[1;32m") \
    man "$@"
}
alias rm='rm -I' # -I: prompt before removing
alias mv='mv -i' # -i: prompt before overwrite
alias ~='cd ~'
alias .="pwd"
alias ..="cd .."
alias ...="cd ../.."
alias ....="cd ../../.."
alias ls="ls -F --group-directories-first --color=auto" # this doesn't work for some reason. EDIT: This didn't work because I was overwriting it in ~truktr/.bashrc
alias l=ls
alias ll="ls -l"
alias la="ls -A"
alias lla="ls -lA"
alias lal="ls -lA"
alias h='history'
alias href='echo -n "Refreshing history... "; hcln; history -c; history -r; echo "done."' #refresh the history. See hcln below.
alias clear="clear; archey"
alias mce="mc -e" # mcedit
alias sudo="sudo " #makes sudo recognize aliases.
alias untar="tar -xzvf"
alias mkdir="mkdir -p"
alias screenoff="xset dpms force off"
#alias less=vimpager #TODO only if vimpager is detected
alias j=jobs
alias vi=vim
#alias cat=lolcat #TODO only if lolcat is detected
alias weechat="weechat-curses"
## END aliases


## execute these at the beginning of the session:
dynamicPS1 	# custom prompt style (see the definition above).
hcln 		# clean the history (see /usr/bin/hcln).

### Chrome OS
##If the home folder is mounted with noexec, remount with exec.
#mount | grep home/chronos/user | cut -d\( -f2 | grep noexec > /dev/null
#if [ $? -eq 0 ]; then
    #sudo mount -i -o remount,exec /home/chronos/user
    #echo " --" Mounted ChromeOS home folder with exec.
#else
    #echo " --" ChromeOS home folder already remounted with exec.
#fi

##If the root folder is mounted read-only, remount read-write.
#mount | grep " / " | cut -d\( -f2 | grep "\bro\b" > /dev/null
#if [ $? -eq 0 ]; then
    #sudo mount -i -o remount,rw /
    #echo " --" Mounted ChromeOS root folder read-write.
#else
    #echo " --" ChromeOS root folder already remounted with read-write.
#fi