watchit.sh

#!/bin/bash

# File: watchit.sh
# Author: Ammar Najjar <najjarammar@gmail.com>
# Description: watches for a file changes and react to that change
# Last Modified: July 05, 2016

function usage() {
    echo "watches for a file changes and react to that change"
    echo
    echo "Usage:"
    echo "    bash $0 [option]"
    echo "    Options:"
    echo "        -h --help          : Show this help messaage."
    echo "        -c --command       : use custom command"
    echo "        -p --pandoc        : create pdf using pandoc"
    echo "        -l --latex         : create pdf using pdflatex"
    echo "        -m --make          : make the project"
    echo "        -mf --make-pdf     : make the project, update mupdf"
}

git_root=`git rev-parse --show-toplevel`
pdf_viewer='mupdf-x11'

function pandoc_cmd() {
    if [[ -f $f ]]
    then
        filename=$(basename $f)
        cd $(dirname $f)
    fi
    pandoc $filename -o "${filename%.*}.pdf"
    killall -HUP $pdf_viewer
}

function tex_cmd() {
    if [[ -f $f ]]
    then
        filename=$(basename $f)
        cd $(dirname $f)
    fi
    pdflatex $filename -o "${filename%.*}.pdf"
    killall -HUP $pdf_viewer
}

function make_cmd() {
    if [[ -f $f ]]
    then
        cd $(dirname $f)
    fi
    if [[ -d $git_root ]]
    then
        cd $git_root
        make
    else
        make
    fi
}

function make_pdf() {
    make_cmd
    killall -HUP $pdf_viewer
}

while (inotifywait -r -e close_write,create,moved_to,modify .)
do
    if [ "$f" = $1 ]; then
        echo "watching: $f"
    else
        case $2 in
            -h|--help)
                usage
                ;;
            -c|--command)
                if [[ ! $3 ]]
                then
                    usage
                else
                    $3
                fi
                ;;
            -mf|--make-pdf)
                make_pdf
                ;;
            -m|--make)
                make_cmd
                ;;
            -p|--pandoc)
                pandoc_cmd
                ;;
            -l|--latex)
                tex_cmd
                ;;
            *)
                echo "$*"
                echo "Invalid arguments"
                echo "Run with -h or --help to see the correct usage"
                ;;
        esac
    fi
done
# vim: set ft=sh ts=4 sw=4 et ai :