Reload the webpage in Firefox when the source file changes

browser-remote-watch.sh

#!/usr/bin/env bash

#
# browser-remote-watch: reload the page when the source changes
#
# Version 1.1
#
# Written by Kevin MacMartin (prurigro@gmail.com)
# Released under the MIT license
#
# Uses the Firefox REMOTE CONTROL extension
#   https://addons.mozilla.org/en-US/firefox/addon/remote-control/
#
# Instructions: run with one or more file or directory to refresh on change
#

# Set REMOTE_PORT to the default unless already configured
REMOTE_PORT=${REMOTE_PORT:='32000'}

# Colours
[[ -t 1 ]] && {
    c_d=$'\e[1;30m' # GREY
    c_r=$'\e[1;31m' # RED
    c_g=$'\e[1;32m' # GREEN
    c_y=$'\e[1;33m' # YELLOW
    c_b=$'\e[1;34m' # BLUE
    c_m=$'\e[1;35m' # MAGENTA
    c_t=$'\e[1;36m' # TEAL
    c_w=$'\e[1;37m' # WHITE
    c_c=$'\e[0m'    # DISABLES COLOUR
}

function error {
    printf '%s %s\n' "${c_r}ERROR:$c_c" "$c_w$1$c_c" >&2
    exit 1
}

[[ -n "$1" ]] \
    || error 'you must supply at least one file or directory to watch'

for each in "$@"; do
    [[ -f "$each" || -d "$each" ]] \
        || error "$1 is not a file or directory"
done

printf '%s %s\n' "$c_b==>$c_w" "press ctrl-c to quit$c_c"

action='Starting'
while (( 1 )); do
    printf '%s\n' "$c_w$action @ $(date)$c_c"
    [[ "$action" = 'Starting' ]] \
        && action='Refreshed'
    inotifywait -e create -e modify "$@"
    printf '%s\n' 'reload' | nc localhost "$REMOTE_PORT"
    printf '\n'
done