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#!/bin/sh
# pget
ver="0.6.3.4.1"
# 
# Copyright (C) 2009 Luke Shumaker
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# Originally written by Luke Shumaker <lukeshu@sbcglobal.net>.


#####################################################################
####################       Option Handling       ####################
#####################################################################
mode="get"
a=""
file=""
ua="Pget/$ver"
base=""
mode="help"
while [ $# -gt 0 ]; do; case "$1" in
	# subsitutions
		-V | -v | --version) mode="version"; break;;
		-h | --help   ) mode="help";    break;;
		# directory base
			-B) base="$2"; shift;;
			# prepends URL to relative links in -F -i file.
			--base=*) base="$($1 | sed s/--base=//)";;
		# user agent
			-U) ua=$2; shift;;
			# identify as AGENT instead of Pget/VERSION.
			--user-agent=*) ua=$($1 | sed s/--user-agent=//);;
		# file
			-i)             mode="file"; code=$2; shift;;
			# download URLs found in FILE.
			--input-file=*)
				mode="file";
				code=$($1 | sed "s/--input-file=//");;
	# not implemented functions
		-e | --execute=*            ) mode="error"; code="$1";;
		#Recursive download:
		-r | --recursive            ) mode="error"; code="$1";;
		-l | --level=*              ) mode="error"; code="$1";;
		     --delete-after         ) mode="error"; code="$1";;
		-k | --convert-links        ) mode="error"; code="$1";;
		-K | --backup-converted     ) mode="error"; code="$1";;
		-m | --mirror               ) mode="error"; code="$1";;
		     --page-requisites      ) mode="error"; code="$1";;
		     --strict-comments      ) mode="error"; code="$1";;
		-A | --accept=*             ) mode="error"; code="$1";;
		-R | --reject=*             ) mode="error"; code="$1";;
		-D | --domains=*            ) mode="error"; code="$1";;
		     --exclude-domains=*    ) mode="error"; code="$1";;
		     --follow-ftp           ) mode="error"; code="$1";;
		     --follow-tags=*        ) mode="error"; code="$1";;
		     --ignore-tags=*        ) mode="error"; code="$1";;
		-H | --span-hosts           ) mode="error"; code="$1";;
		-L | --relative             ) mode="error"; code="$1";;
		-I | --include-directories=*) mode="error"; code="$1";;
		-X | --exclude-directories=*) mode="error"; code="$1";;
		-np |  --no-parent          ) mode="error"; code="$1";;
	# removed functions
		-O | --output-document=*    ) mode="wget";  code="$1";;
		-nc | --no-clobber          ) mode="wget";  code="$1";;
		-c | --continue             ) mode="wget";  code="$1";;
		-N | --timestamping         ) mode="wget";  code="$1";;
		     --spider               ) mode="wget";  code="$1";;
		-P | --directory-prefix=*   ) mode="wget";  code="$1";;
	# general handling
			# these are all wget options that take a second argument
			-o | -a | -t | -T | -w | -Q) a="$a $1 $2"; shift;;
		--)  shift; break;;
		-g | -p) break;;
		-*) a="$a $1";;
		*)  break;;	# terminate while loop
esac
shift
done

# all command line switches are processed,
# "$@" contains all file names

#####################################################################
####################          The  Core          ####################
#####################################################################
if [ $mode = "file" ]; then
	set -- $(cat $code | tr '\n' ' ')
	mode="get"
fi

if [ $mode = "get" ]; then
	od=$PWD
	gz="false"
	p="false"
	while [ $# -gt 0 ]; do
		while [ 1 -gt 0 ]; do
			case "$1" in
				-g) gz="true";;
				-p) p="$2"; shift;;
				*)  break;;
			esac
			shift
		done
		
		cache="$HOME/.pget/cache/$(dirname $2)"	
		mkdir -p $cache
		cd $cache
		
		got="false"
		file="$1"
		temp="$HOME/.pget/cache/$2"
		
		if [ $gz = "true" ]; then
			echo -n "A cached copy of the archive "
			if [ -e $temp ]; then
				echo "already exists"
				before="$(stat -c %Y $temp)"
			else
				echo "does not exist"
				before="false"
			fi
		else
			if [ -e $file ]; then
				echo "A local copy already exists"
				before="$(stat -c %Y $file)"
				mv $file $temp
			else
				echo "A local copy does not exist"
				before="false"
			fi
		fi
		
		cd "$cache"
		echo "\033[31m"
		wget -N -U "$ua" $a $base$2
		echo "\033[0m"
		after=$(stat -c %Y $temp)
		if [ "$before" != "$after" ]; then
			echo "A new version of the file was retrieved"
			if [ $gz = "true" ]; then
				echo "Decompressing..."
				gunzip -c $temp > $file
				gz=""
			else
				mv $temp $file
			fi
			
			if [ $p != "false" ]; then
				chmod $p $file
				p="false"
			fi
		else
			echo "A new version of the file was not retreived"
			if [ $gz = "false" ]; then
				mv $temp $file
			fi
		fi
		shift 2
	done
	cd $od
fi

#####################################################################
####################          Messages!          ####################
#####################################################################
if [ $mode = "wget" ]; then; cat <<__wget__
You used the $code option."
This is a valid option in wget, but does not make sense in pget."
__wget__
fi

if [ $mode = "error" ]; then; cat <<__error__
You used the $code option.  This is a valid option in wget,"
but has not been implemented in pget."
This does not mean it cannot be, it just hasn't yet."
    PATCHES ARE WELCOME!"
"
For more information on pget, try 'pget -h' or 'pget --help'."
For more information on Wget, try 'wget -h' or 'wget --help'."
__error__
fi

if [ $mode = "version" ]; then; cat <<__version__
pget $ver, running on top of $(wget -V | grep -i wget)"
"
pget (but not Wget) is copyright (C) 2009 Luke Shumaker"
This program is distributed in the hope that it will be useful,"
but WITHOUT ANY WARRANTY; without even the implied warranty of"
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the"
GNU General Public License for more details."
"
Originally written by Luke Shumaker <lukeshu@sbcglobal.net>."
"
Use 'wget -V' for more information about Wget"
__version__
fi

if [ $mode = "help" ]; then; cat <<__help__
pget $ver, a non-interactive network retriever for eventual use in a
package manager and version control system.
Usage: pget [OPTIONS] [OPTIONS1] [FILE1] [URL1] [OPTIONS2] [FILE2] [URL2]...
   or: pget [OPTIONS] -i [FILELIST]

Mandatory arguments to long options are mandatory for short options too.
With arguments to short options, insert a space between them
       do: -f file
    don't: -ffile

All of the pget options work are exactly like wget,
  with the exeption that recursion is disabled,
  as are
    -O,  --output-document=FILE     write documents to FILE.
    -nc, --no-clobber               skip downloads that would download
                                    to existing files.
    -c,  --continue                 resume getting a partially-
                                    downloaded file.
    -N,  --timestamping             pget always checks timestamps
         --spider                   don't download anything.
    -P,  --directory-prefix=PREFIX  save files to PREFIX/...
  and '-e' / '--execute=*' is not implemented [yet],

File options:
  -g                        The file needs to be ran throught gunzip.
  -p PERMISSIONS            Run 'chown PERMISSIONS FILENAME' on the
                            file after it is downloaded

Report bugs to <lukeshu@sbcglobal.net>.
__help__
fi