.bashrc to configure a coloured bash prompt with current source control branch information if any.

.aliases

# some aliases to mimic windows command prompt directory changes
alias c:="cd /mnt/c"
alias d:="cd /mnt/d"

.bashrc

# We have to surround every colour with \[ and \] so bash doesn't include them when counting
# how long the current line is. Without the escaped characters line wrapping breaks. 

# Normal 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
bold_black='\[\e[1;30m\]'       # Black
bold_red='\[\e[1;31m\]'         # Red
bold_green='\[\e[1;32m\]'       # Green
bold_yellow='\[\e[1;33m\]'      # Yellow
bold_blue='\[\e[1;34m\]'        # Blue
bold_purple='\[\e[1;35m\]'      # Purple
bold_cyan='\[\e[1;36m\]'        # Cyan
bold_white='\[\e[1;37m\]'       # White

# Background
back_black='\[\e[40m\]'       # Black
back_red='\[\e[41m\]'         # Red
back_green='\[\e[42m\]'       # Green
back_yellow='\[\e[43m\]'      # Yellow
back_blue='\[\e[44m\]'        # Blue
back_purple='\[\e[45m\]'      # Purple
back_cyan='\[\e[46m\]'        # Cyan
back_white='\[\e[47m\]'       # White

clear_colour='\[\e[m\]'               # Color Reset

# prints the name of the current git or mercurial branch if any
scm_branch() {
    # git branch lists all branches with a * next to the name of the current so we have to use sed to strip the other branches
    branch=`git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'`
    # use double [ so we don't need to quote the $branch variable
    # -z tests for an empty string
    if [[ -z $branch ]]; then
        branch=`hg branch 2> /dev/null`
    fi

    # -n tests for a non empty string
    if [[ -n $branch ]]; then
        echo -e "[${branch}]"
    fi
}

export PS1="$green\u@\h$clear_colour:$cyan\W${yellow}\$(scm_branch)$clear_colour\$ "

if [ -f $HOME/.aliases ]; then
        source $HOME/.aliases
fi