.bashrc_

# git prompt
if [ "$color_prompt" = yes ]; then
    source /usr/lib/git-core/git-sh-prompt
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]$(__git_ps1 " (%s) ")\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

GIT_PS1_SHOWDIRTYSTATE=1
GIT_PS1_SHOWSTASHSTATE=1
GIT_PS1_SHOWUNTRACKEDFILES=1
GIT_PS1_SHOWUPSTREAM="verbose git"

# extract pdf pages
function pdf-extract()
{
    EXPECTED_ARGS=3

    if [ $# -ne $EXPECTED_ARGS ]
    then
        echo "pdf-extract {input pdf file} {first page} {last page}"
    else
        gs -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dSAFER \
           -dFirstPage=${2} \
           -dLastPage=${3} \
           -sOutputFile="${1%.pdf}_page_${2}-${3}.pdf" \
           "${1}"
    fi
}