#!/bin/bash
# CVS:     $Id: mozer,v 1.6 2005/06/17 11:22:05 becki Exp $
# Author:  Stefan Beckert  http://becki.skiclub-mitwitz.de
# License: Public Domain
# Description:
#   Use firefox, mozilla or netscape from the command line to display html
#   pages, text files or images (like 'less' for text files).
#   Each invocation of this script creates a new tab in your browser
#   (tabbed browsing).
#   If your browser is not running yet, it will be started.
# Examples:
#   mozer becki.skiclub-mitwitz.de         # opens webpage in new tab
#   mozer -s becki.skiclub-mitwitz.de      # opens webpage in same tab
#   mozer ~/.profile                       # opens local file in new tab
#   mozer ftp://url                        # opens ftp-url in new tab
#   mozer -s javascript:home()             # opens your homepage in same tab


#### CONFIGURATION (optional) #################################################
#
# customize path to browser startup script here if necessary:
# This script expects the path to your default browser in the environment
# variable $BROWSER
# You can set it with e.g.: "export BROWSER=firefox" in  ~/.profile
# If you don't want that, set the path to your browser manually here
# Examples:
#browser=firefox
#browser=/usr/bin/firefox
#browser=/user/bin/mozilla
#browser=/opt/netscape/netscape
#
###############################################################################


# default values:
usage="Usage: \"$(basename $0) [-s] url\" to open url in new [or same] tab of your browser"
debug='false' # do nothing instead of echo
same=0 # use new tab, not the same window

# for debugging only: (create a symlink called debugmozer -> mozer and call this
# script with 'debugmozer')
if [ $(basename $0) == debugmozer ]; then
    debug='echo'
fi

# get path to browser if not configured above:
if [ ! "$browser" ]; then
    if [ "$BROWSER" ]; then
	$debug "using environment variable \$BROWSER=$BROWSER" >&2
	browser=$BROWSER # use environment variable for browser locaton
    fi
else
    $debug "user has set \$browser=$browser" >&2
fi

# nothing set: try to detect browser:
if [ ! "$browser" ]; then
    if   which firefox 1>/dev/null 2>/dev/null; then
	browser=firefox
    elif which mozilla 1>/dev/null 2>/dev/null; then
	browser=mozilla
    elif which netscape 1>/dev/null 2>/dev/null; then
	browser=netscape
    fi
    if [ "$browser" ]; then
	echo "detected $browser, set \$BROWSER environment variable if you want to change this" >&2
    else
	echo "ERROR: Can't find your browser, set \$BROWSER environment variable!" >&2
	echo -e $usage >&2
	exit 1
    fi
fi

# get options:
while getopts ":s?" Option
do
    case $Option in
        s ) same=1 ;; # user doesn't want a new tab
        ? ) echo -e $usage >&2; exit 0 ;;
    esac
done
shift $(($OPTIND - 1)) # Move argument pointer to next.

# Test if instace of browser already exists:
$browser -remote "ping()" 2> /dev/null
off=$?

# Test number of remaining command line arguments:
if [ $# -ne 1 ]; then
    echo "ERROR: Wrong number of arguments!" >&2
    echo -e $usage >&2
    exit 1
fi
url=$1 # set default value of url, may be overwritten later

# Test if argument is a local file & exists:
if [ -e $1 ]; then
    $debug "$1 is a local file" >&2

    # Try to cd into specified directory:
    #   Mozilla etc. require the absolte pathname of the file.
    #   To cd into the specified directory is a workaround, because I don't know
    #   how to determine the absolute pathname directly.  Any suggestions?
    dirn=$(dirname $1)
    cd $dirn &> /dev/null

    if [ $? -eq 0 ]; then
        url="file://$PWD/$(basename $1)"
    else
        echo "ERROR: Can't change into $dirn" >&2
        exit 2
    fi

# no local file => Test if argument is a fully qualified url:
elif [ $(expr substr $1 1 7) == 'http://' ]; then # 1st char has index 1 not 0!
    $debug "$1 is a http-url" >&2
elif [ $(expr substr $1 1 8) == 'https://' ]; then
    $debug "$1 is a https-url" >&2
elif [ $(expr substr $1 1 6) == 'ftp://' ]; then
    $debug "$1 is a ftp-url" >&2
elif [ $(expr substr $1 1 11) == 'javascript:' ]; then
    $debug "$1 is a javascript-url" >&2

# no file, no url: fallback to hypertext:
else
    url="http://$1"
    echo -e "$1 is neither a local file nor a fully qualified url\n\
 -> assuming $url" >&2
fi
#$debug "url: $url"

if [ $off -eq 0 ]; then # open url in running window:
    # We use remote control of unix mozilla here, see
    # http://www.mozilla.org/unix/remote.html
    if [ $same -eq 0 ]; then
        $debug "loading $url in new tab" >&2
        $browser -remote "openURL($url, new-tab)"
    else
        $debug "loading $url in same window" >&2
        $browser -remote "openURL($url)"
    fi
else # open mozilla with url:
    # If browser is not running yet, start browser.
    $debug "starting $(basename $browser) with $url" >&2
    $browser $url &
fi