#!/bin/bash
#####################
#
# name: comicget (comicget.sh)
# vers: 0.2a
# date: 071206
# first: 070706
# auth: "Keith Beckman" <kbeckm@alphahelical.com>
# site: http://alphahelical.com/code/scripts/comicget
# desc: comicget is a comics.com client for bash. Currently it only supports
#       curl as a user-agent.
#
# todo: archive retrieval, wget/lynx/links/telnet support
#       also, a more robust 'recent' mode that allows date selection
#       archival of comics by month into compressed archives
#       generate a "latest comics page" suitable for using as a browser homepage
#
# license: comicget is copyright 2006 Keith Beckman and is licensed under the
#          GNU General Public License (http://gnu.org/licenses/gpl.txt)
#
#####################

####configuration####

datadir='/tmp'
open_command='open'
open_multiple=1 # 1 if $open_command can handle a list of items, 0 otherwise

# under X11, you might have
#open_command='xv'
#open_multiple=0

#comics dwelling under comics.com/comics
comics_list="alleyoop dilbert drabble getfuzzy hedge jumpstart pearls"

#comics dwelling under comics.com/creators, from the old Creators Syndicate
creators_list="bc wizardofid"

host='http://comics.com'

silent_flag='-s' # what option(s) to pass the UA for silent downloads

seconds=43200 # seconds between updates
verbose=1 # default verbosity level, 0-2
mode='retrieval' # default mode

verstring='comicget v0.2a 071206 keith beckman'

##end configuration##

function echo_usage() {
cat <<!
Usage: comicget -[rVqfvh]
    comicget is a comics.com client
    
    -r|--recent opens comics downloaded in the past day
    -V|--verbose sets maximum verbosity
    -q|--quiet sets no output
    -f|--force forces an update before the interval has elapsed
    -v|--version echoes the version string
    -h|--help displays this help text
!
	}

while [ "$1" != '' ]; do
	case $1 in
		-r|--recent)
			mode='recent'
			;;
		-V|--verbose)
			verbose=2
			;;
		-q|--quiet)
			verbose=0
			;;
		-f|--force)
			force=1
			;;
		-v|--version)
			echo $verstring && exit
			;;
		-h|--help|-u|--usage)
			echo_usage && exit
			;;
		*)
			;;
	esac
		shift
	done


if [ -f $datadir/touch ]; then
	let dif=$(date +%s)-$(stat -f %m $datadir/touch)
else
	touch $datadir/touch
	let dif=$seconds+1
fi


##MODE: RETRIEVAL##
if [[ $mode == 'retrieval' && ( $dif -gt 43200 || $force == 1 ) ]]; then

case $verbose in
	0|1)
		img_dl_flags=$silent_flag
		dat_dl_flags=$silent_flag
		;;
	2)
		img_dl_flags=''
		dat_dl_flags=''
		;;
esac

function grab_image () {

# grab_image takes as $1 a comic directory, i.e. "bc" for /comics/bc
# and for $2 takes the parent directory of $1

	if [ ! -d $datadir/$1 ]; then
		mkdir $datadir/$1
	fi
	
	if [ ! -f $datadir/$1/touch ]; then
		touch $datadir/$1/touch
	fi

	if [ $verbose -gt 0 ]; then
		echo "Checking $1"
	fi

	imgpath=$host/$(curl $dat_dl_flags $host/$2/$1/ |\
	grep "Today's Comic" | grep "$2/$1/archive/images" |\
	sed "s/.*<IMG SRC=\"\/\(.*\)\" ALT=.*>.*/\1/")

	# how we know if we're online
	if [ $imgpath == "$host/" ]; then return 1; fi

	extension=$(sed 's/.*\.\(...\)$/\1/' <<< $imgpath)

	if [ "$(cat $datadir/$1/touch)" != $imgpath ]; then
		if [ $verbose -gt 0 ]; then
			echo "Updating $1"
		fi
		
		if [ $verbose -gt 1 ]; then echo $imgpath; fi
		curl $img_dl_flags $imgpath > $datadir/$1/$1-$(date +%F).$extension

		echo $imgpath > $datadir/$1/touch
	fi

	}

natch=1

for comic in $comics_list; do
	grab_image $comic comics
	if [[ $? -eq 0 && $natch -eq 1 ]]; then
		natch=1; else natch=0; fi
	done

for comic in $creators_list; do
	grab_image $comic creators
	if [[ $? -eq 0 &&  $natch -eq 1 ]]; then
		natch=1; else natch=0; fi
	done

if [ $natch -eq 1 ]; then touch $datadir/touch; fi

##MODE: RECENT##

elif [ $mode == 'recent' ]; then
	if [ "$open_multiple" -eq 1 ]; then
		$open_command $(find $datadir -mtime 1 | grep '\....$');
	else
		for item in $(find $datadir -mtime 1 | grep '\....$'); do
			$open_command $item
			done
	fi

fi