#!/bin/sh
# Surfraw -- Shell Users' Revolutionary Front Against the World wide web
#
#  Copyright (c) 2003-2018 The Surfraw-Devel Team
#                          <surfraw-devel@lists.alioth.debian.org>
#  Copyright (c) 2000-2001 Julian Assange, placed into the public domain
#  Copyright (c) 2000 Melbourne Institute for Advanced Study, placed into the public domain
#
# see the file COPYING for further copyright details
#

surfraw_version=@VERSION@
surfraw_api_version=1.0
w3_argv0=`basename "$0"`

elvidir="@ELVIDIR@"

# defaults

w3_config_hook () {
    return 1
}

find_global_conf () {
    base="$1"
    local conf OIFS
    conf=""
    if test -n "$XDG_CONFIG_DIRS"; then
	OIFS="$IFS"
	IFS=:
	set $XDG_CONFIG_DIRS
	IFS="$OIFS"
	for i in "$@"; do
	    if test -r "$i/surfraw/$base"; then
		conf="$i/surfraw/$base"
		break
	    fi
	done
    elif test -r "@sysconfdir@/xdg/surfraw/$base"; then # XDG default
	conf="@sysconfdir@/xdg/surfraw/$base"
    elif test -r "@sysconfdir@/surfraw.$base"; then # old surfraw default
	conf="@sysconfdir@/surfraw.$base"
    fi
    echo "$conf"
}

load_global_conf () {
    local conf
    if test -n "$SURFRAW_global_conf" && test -r "$SURFRAW_global_conf"; then
	conf="$SURFRAW_global_conf"
    else
	conf=$(find_global_conf conf)
    fi
    if test -z "$conf" || ! test -r "$conf"; then
	err "couldn't find global config in @sysconfdir@/xdg/surfraw/conf or \$XDG_CONFIG_DIRS"
    fi
    . "$conf"
}

find_local_conf () {
    base="$1"
    if test -n "$XDG_CONFIG_HOME" && test -r "$XDG_CONFIG_HOME/surfraw/$base"; then
	echo "$XDG_CONFIG_HOME/surfraw/$base"
    elif test -n "$HOME"; then
	if test -r "$HOME/.config/surfraw/$base"; then
	    echo "$HOME/.config/surfraw/$base"
	elif test -r "$HOME/.surfraw.$base"; then
	    echo "$HOME/.surfraw.$base"
	fi
    fi
}

load_local_conf () {
    local conf
    conf=""
    if test -n "$SURFRAW_conf" && test -r "$SURFRAW_conf"; then
	conf="$SURFRAW_conf"
    else
	conf="$(find_local_conf conf)"
    fi
    if test -n "$conf" && test -r "$conf"; then
	. $conf
    fi
}

get_local_elvi_dir () {
    if test -n "$XDG_CONFIG_HOME";then
	echo "$XDG_CONFIG_HOME/surfraw/elvi"
    elif test -n "$HOME";then
	echo "$HOME/.config/surfraw/elvi"
    fi
}

w3_config () {
    load_global_conf
    w3_config_hook
    load_local_conf
}

warn () {
    echo "$w3_argv0 WARNING: ""$@" >&2
}

err () {
    echo "$w3_argv0 ERROR: ""$@" >&2
    exit 1
}

yesno () {
    eval value=\$${1}
    case `echo "$value" | tr A-Z a-z` in
	yes|true|on|1)	return 0 ;;
	no|false|off|0)	return 1 ;;
	*) err "\"$1\" is not set correctly. Should be (yes|on|1|no|off|0). Is \"$value\"" ;;
    esac
}

ifyes () {
    yesno "$@" && return 0
    return 1
}

ifno () {
    yesno "$@" && return 1
    return 0
}

ok () {
    yesno "$@"
}

null () {
    test -z "$@" && return 0
    return 1
}

def () {
    eval value=\$${1}
    test -z "$value" || return 0
    eval ${1}="$2"
    return 0
}

defyn () {
    eval value=\$${1}
    test -z "$value" && eval ${1}="$2"
    yesno "$1"
}

setopt  () {
    eval value=\$${1}
    eval ${1}="$2"
}

setoptyn () {
    eval value=\$${1}
    eval ${1}="$2"
    yesno "$1"
}

quote_ifs () {
	 if [ -z "$1" ];   then return;  fi
     @PERL@ -e '$ifs=$ENV{IFS} || " "; $arg=shift;if($arg =~/[$ifs]/) { $arg="\"$arg\""; } print "$arg\n"; ' -- "$1"

}

bookmark_file_search () {
	search="$1"
	file="$2"
	if [ -r "$file" ]
	then
		@AWK@ -v search="$search" '$1 == search { for (nLoop = 2;nLoop <= NF; nLoop++) printf("%s ", $nLoop); print ""; }' $file | head -n 1
	fi
}

bookmark_lookup () {
	search="$1"
	file=$(find_local_conf bookmarks)
	lookup=$(bookmark_file_search "$search" "$file")
	if [ -z "$lookup" ]
	then
	    file=$(find_global_conf bookmarks)
	    lookup=$(bookmark_file_search "$search" "$file")
	fi
	if [ -n "$lookup" ]
	then
		echo "$lookup"
	fi
}

w3_find_prog () {
  prog="$1"
  old_ifs="${IFS:-\" \"}"
  IFS=":"
  path_ifs="$PATH"
  for dir in $path_ifs; do
    test -z "$dir" && dir=.
    if test -e "$dir/$prog"; then
	echo "$dir/$prog"
	IFS="$old_ifs"
	return 0
    fi
  done
  IFS="$old_ifs"
  return 1
}

w3_url_escape () {
    echo "$@" | sed 's/%/%25/g;
		     s/+/%2B/g;
#		     s/ /+/g;
		     s/ /%20/g;
		     s/(/%28/g;
		     s/)/%29/g;
		     s/"/%22/g;
		     s/#/%23/g;
		     s/\$/%24/g;
		     s/&/%26/g;
		     s/,/%2C/g;
#		     s/\./%2E/g;
		     sx/x%2Fxg;
		     s/:/%3A/g;
		     s/;/%3B/g;
		     s/</%3C/g;
		     s/=/%3D/g;
		     s/>/%3E/g;
		     s/?/%3F/g;
		     s/@/%40/g;
		     s/\[/%5B/g;
		     s/\\/%5C/g;
		     s/\]/%5D/g;
		     s/\^/%5E/g;
		     s/{/%7B/g;
		     s/|/%7C/g;
		     s/}/%7D/g;
		     s/~/%7E/g;
		     s/`/%60/g;
		   '"s/'/%27/g"
}

w3_url_of_arg () {
    if ok SURFRAW_quote_args; then
        args=\""$@"\"
    else
        args="$@"
    fi
    if ok SURFRAW_escape_url_args; then
     	w3_url_escape "$args"
    else
	    echo "$args"
    fi
}

true () {
    return 0
}

false () {
    return 1
}

w3_global_usage () {
    defyn SURFRAW_local_help no
    if ifyes SURFRAW_local_help; then
	return;
    fi
# style: keep sorted
#-------------------------------------79 cols----------------------------------
    cat <<EOF
Global options:
  -bookmark-search-elvis=ELVIS	If args are passed to a non-searchable
				bookmark, search with this elvis instead.
				Default: $SURFRAW_bookmark_search_elvis
				Environment: SURFRAW_bookmark_search_elvis
  -browser=EXECUTABLE		Set browser
				Default: $SURFRAW_browser
  -custom-search=PROVIDER       Use PROVIDER for custom searches.
				Supported: google, duckduckgo
				Default: $SURFRAW_customsearch_provider
				Environment: SURFRAW_customsearch_provider
  -elvi				List Surfraw mechanisms for conquering evil
  -escape-url-args=yes|no	Apply url escaping to arguments
				Default: $SURFRAW_escape_url_args
				Environment: SURFRAW_escape_url_args
  -g | -graphical		Get some windowed sin
  				Default: $SURFRAW_graphical
				Environment: SURFRAW_graphical
  -h  | -help			What you're reading now, dude
  -lh | -local-help		Just show elvi-specific help, not the global options
  -p | -print			Just print search URL, don't pass to browser
  -o | -o=FILE			Fetch URL and dump to stdout or FILE.
  -new[=yes|no]			Start in a new window
				Default: $SURFRAW_new_window
				Environment: SURFRAW_new_window
  -ns[=yes|no]			Start in a new screen
     | -newscreen[=yes|no]	Default: $SURFRAW_new_screen
				Environment: SURFRAW_new_screen
  -t | -text			Back to the yellow brick road
  -q | -quote			Quote arguments with " characters
				Default: $SURFRAW_quote_args
				Environment: SURFRAW_quote_args
  -version			Display Surfraw version ($surfraw_version)
  --				End of options
Copyright:
  Copyright (c) 2003-2013 The Surfraw-Devel Team
                           <surfraw-devel@lists.alioth.debian.org>
  Copyright (c) 2000-2001 Julian Assange <proff@iq.org>
  Copyright (c) 2001 Australian Institute for Collaborative Research
  Copyright (c) 2000 Melbourne Institute for Advanced Study
EOF
}

w3_usage_hook () {
    echo "Usage: $w3_argv0 [options] [args...]"
    w3_global_usage
}

w3_bad_option () {
    err "bad option \"${opt}\". Try ${w3_argv0} -help for usage information"
}

w3_parse_option_hook () {
    return 1
}

list_elvi() {
    local_dir="$1"
    awk '/^#[ 	]+elvis:[ 	]+/{ sub("^# elvis: ",""); print $0; }' $(find "$local_dir/" ! -type d ! -type l ! -name '*~' | sort | xargs)
    for script in $(find "$local_dir/" ! -type d -type l | sort) ; do
	printf '%-16s--> %s\n' $(basename "$script") $(basename $(readlink "${script}"))
    done
}

w3_parse_option () {
    opt="$1"
    case "$opt" in
	    -*=*) optarg=`echo "$opt" | sed 's/[-_a-zA-Z0-9]*=//'`
    esac
    w3_parse_option_hook "$opt" "$optarg" && return 0
    case "$opt" in
    -bookmark-search-elvis=*)
        setopt SURFRAW_bookmark_search_elvis   $optarg ;;
	-browser=*)	    setopt   SURFRAW_browser		$optarg	;;
	-elvi)		    echo " GLOBAL ELVI:"
			    list_elvi "$elvidir"
			    localelvidir=$(get_local_elvi_dir)
			    if [ -d "$localelvidir" ] && [ -n "$(ls "$localelvidir")" ]; then
				echo " LOCAL ELVI:"
				list_elvi "$localelvidir"
			    fi
			    exit 0 ;;
	-escape-url-args=*) setoptyn SURFRAW_escape_url_args	$optarg ;;
	-g | -graphical)    setoptyn SURFRAW_graphical		yes	;;
	-help | --help |-h) do_help=1					;;
	-local-help | \
	--local-help |-lh ) do_help=1 ;setoptyn SURFRAW_local_help yes  ;;
	-q | -quote)	    setoptyn SURFRAW_quote_args	    	yes	;;
	-new)		    setoptyn SURFRAW_new_window		yes	;;
	-new=*)		    setoptyn SURFRAW_new_window		$optarg ;;
	-ns | -newscreen)   setoptyn SURFRAW_new_screen yes ;;
	-ns=* | -newscreen=*)   setoptyn SURFRAW_new_screen $optarg ;;
	-custom-search=*)    setopt SURFRAW_customsearch_provider $optarg ;;
	-o)		    setoptyn SURFRAW_dump		yes	;;
	-o=*)		    setoptyn SURFRAW_dump		yes
			    setopt SURFRAW_dump_file		$optarg ;;
	-t | -text)	    unset DISPLAY
			    setoptyn SURFRAW_graphical 		no	;;
	-version)	    echo $surfraw_version; exit 0	    	;;
	-p | -print)        setoptyn SURFRAW_print  yes     		;;
	--)		    setoptyn SURFRAW_end_of_args yes 		;;
	-*)		    w3_bad_option "$opt"		    	;;
	*)		    return 1					;;
    esac
    return 0
}

w3_parse_args () {
    w3_args=
    w3_shquoted_args=
    def SURFRAW_browser none
    def SURFRAW_browser_args none
    defyn SURFRAW_quote_ifs yes
    defyn SURFRAW_end_of_args no
    do_help=0
    mode=unknown
    for arg in "$@"; do
	isarg=1
	if ifno SURFRAW_end_of_args
	then
	    w3_parse_option "$arg"
	    isarg=$?
	fi
        if [ $isarg -eq 1 ]
	then
	    if  [ -z "$w3_shquoted_args" ]
	    then
		w3_shquoted_args="`quote "$arg"`"
	    else
		w3_shquoted_args="$w3_shquoted_args `quote "$arg"`"
	    fi
	    if ok SURFRAW_quote_ifs
	    then
		arg=`quote_ifs "$arg"`
	    fi
	    if [ -n "$w3_args" ]
	    then
		w3_args="$w3_args $arg"
	    else
		w3_args="$arg"
	    fi
	fi
    done
    if test $SURFRAW_browser = none; then
	if ok SURFRAW_graphical && test -n "$DISPLAY"; then
		SURFRAW_browser=$SURFRAW_graphical_browser
		SURFRAW_browser_args=$SURFRAW_graphical_browser_args
		mode=graphical
	else
		SURFRAW_browser=$SURFRAW_text_browser
		SURFRAW_browser_args=$SURFRAW_text_browser_args
		mode=text
	fi
    fi
    if ok do_help; then
	w3_usage_hook
	exit 0
    fi
}

w3_dump () {
    if test -z "$SURFRAW_dump_file"; then
	SURFRAW_dump_file="-"
    fi
    if test -x "$(which curl)"; then
	curl -o "$SURFRAW_dump_file" "$@"
    elif test -x "$(which wget)"; then
	wget -q -O "$SURFRAW_dump_file" "$@"
    elif test -x "$(which GET)"; then
	if test "$SURFRAW_dump_file" = "-"; then
	    GET "$@"
	else
	    GET "$@" > "$SURFRAW_dump_file"
	fi
    else
	err "No URL fetcher found: install curl, wget or libwww-perl"
    fi
}

w3_browse_url () {
    if ok SURFRAW_new_screen && test `echo $TERM | cut -c 1-6` = "screen" &&
	test $mode = text; then
	screen=yes
    else
	screen=no
    fi
    if ok SURFRAW_dump; then
	w3_dump "$@"
    elif ok SURFRAW_print; then
	echo "$@"
    elif ok screen; then
	if [ "$SURFRAW_screen" = "tmux" ]; then
	    if test "$SURFRAW_browser_args" = "none"; then
		$SURFRAW_screen $SURFRAW_screen_args "$SURFRAW_browser \"$@\""
	    else
		$SURFRAW_screen $SURFRAW_screen_args "$SURFRAW_browser $SURFRAW_browser_args \"$@\""
	    fi
	else
	    if test $SURFRAW_browser_args = "none"; then
		$SURFRAW_screen $SURFRAW_screen_args $SURFRAW_browser "$@"
	    else
		$SURFRAW_screen $SURFRAW_screen_args $SURFRAW_browser $SURFRAW_browser_args "$@"
	    fi
	fi
    else
	if ok SURFRAW_graphical_remote && test $mode = graphical; then
		if ok SURFRAW_new_window; then
			newwin=", new-window"
		else
			newwin=""
		fi
		if test $SURFRAW_browser_args = "none"; then
			$SURFRAW_browser -remote "openURL($*$newwin)" 2>/dev/null || $SURFRAW_browser "$@" &
		else
			$SURFRAW_browser -remote "openURL($*$newwin)" 2>/dev/null || $SURFRAW_browser $SURFRAW_browser_args "$@" &
		fi
	else
		if test $SURFRAW_browser_args = "none"; then
				$SURFRAW_browser "$@"
		else
			$SURFRAW_browser $SURFRAW_browser_args "$@"
		 fi
	fi
    fi
}

w3_custom_search_usage() {
    echo "Custom search:"
    echo "  To choose which search engine gets used for custom searches,"
    echo "  configure SURFRAW_customsearch_provider"
    echo "  or use -custom-search=PROVIDER"
    echo "  supported: google, duckduckgo"
    echo "  default: $SURFRAW_customsearch_provider"
}

w3_custom_search() {
    case "$SURFRAW_customsearch_provider" in
        google)      w3_custom_search_google     "$@" ;;
        duckduckgo)  w3_custom_search_duckduckgo "$@" ;;
        ixquick)     w3_custom_search_ixquick    "$@" ;;
        *)           w3_custom_search_duckduckgo "$@" ;;
    esac
}

w3_custom_search_google() {
    params=$(eval w3_custom_search_mangle -s site: $*)
    params=$(eval w3_custom_search_mangle -u inurl: $params)
    params=$(eval w3_custom_search_inurl_quote_dots $params)
    url="$(eval surfraw google -p $params )"
    w3_browse_url "$url"
}

w3_custom_search_duckduckgo() {
    params=$(eval w3_custom_search_mangle -s site: $*)
    params=$(eval w3_custom_search_mangle -u inurl: $params)
    url="$(eval surfraw duckduckgo -p $params )"
    w3_browse_url "$url"
}

w3_custom_search_ixquick() {
    params=$(eval w3_custom_search_mangle -s host: $*)
    params=$(eval w3_custom_search_mangle -u url: $params)
    url="$(eval surfraw ixquick -p $params )"
    w3_browse_url "$url"
}

w3_custom_search_mangle() {
    search="$1"
    replace="$2"
    shift
    shift
    for arg in "$@"
    do
        quote "$(echo "$arg" | sed "s/^${search}=\(.*\)/${replace}\1/")"
    done
}

w3_custom_search_inurl_quote_dots() {
    for arg in "$@"
    do
        if echo "$arg" | grep -q -- inurl:
        then
            quote "$(echo "$arg" | sed 's/\./\\./g;')"
        else
            quote "$arg"
        fi
    done
}

quote () {
	quoted=`echo "$1"|sed "s/'/'\\\\\''/g"`
	echo "'$quoted'"
}

surfraw_usage() {
	cat <<EOF
Usage: $w3_argv0 [-help] [-elvi] elvis [elvioptions] [search terms]
       $w3_argv0 [options] bookmark [search terms]
    If you wish to run the elvi directly, run "surfraw-update-path" to append
	$elvidir to your \$PATH in your shell's config files.
    See surfraw-update-path(1) for details
Options:
   -elvi  List elvi
   -help  This help
sr is an alias for surfraw
EOF
	w3_global_usage
}

# Browse URL or perform a search on URL(s) if search terms
# are provided (use the user's elvis of choice if URL has no
# %s field or multiple if multiple URLs are provided)
parse_bookmark()
{
    if [ -z "$w3_args" ]; then
        case "$bookmark" in
            *"%s"*)
                # Keep only the domain address, the rest contains %s which should be filtered.
                bookmark=$(echo $bookmark | @AWK@ -F '/' '{print $1 "//" $3}')
                ;;
            *)
                # Keep the first URL (if multiple-URL bookmark) as-is, no %s here...
                bookmark=$(echo $bookmark | cut -f 1 -d ' ')
                ;;
        esac
    else
        escaped_args=$(w3_url_of_arg $w3_args)

        case "$bookmark" in
            *"%s"*)
                bookmark="$(echo $bookmark | sed "s|\%s|$escaped_args|")"
                ;;
            *)
                [ -z $SURFRAW_bookmark_search_elvis ] && SURFRAW_bookmark_search_elvis=google
                bookmark=$(echo $bookmark | sed -e 's|^|site:|' \
                                                -e 's|\ |\ OR\ site:|g' \
                                                -e "s|^|$w3_args |" \
                                                -e "s|^|$SURFRAW_bookmark_search_elvis |")
                ;;
        esac
    fi
    echo $bookmark
}

if [ "$w3_argv0" = "surfraw" -o "$w3_argv0" = "sr" ]
then
	w3_config
	opts=""
	unquoted_opts=""
	unquoted_searchterms=""
	elvi=""
	searchterms=""
	do_help=0
	for arg in "$@"
	do
	  # if it is an option
	  if [ "$(echo "$arg" | sed 's/^\(.\).*/\1/;' )" = "-" ]
	  then
		  # if option before elvi
		  if [ -z "$elvi" ]
		  then
			  case "$arg" in
			      -help | --help |-h) do_help=1 ;;
			      -local-help  | \
			      --local-help | \
			      -lh | -\? ) do_help=1 ; setoptyn SURFRAW_local_help yes ;;
			      -elvi*)  w3_parse_option -elvi; exit 0 ;;
			  esac
		  fi
		  if ok do_help
		  then
		      surfraw_usage
		      exit 0
		  fi
		  if  [ -z "$opts" ]
		  then
			  opts="`quote "$arg"`"
			  unquoted_opts="$arg"
		  else
			  opts="$opts `quote "$arg"`"
			  unquoted_opts="$unquoted_opts $arg"
		  fi
	  elif [ -z "$elvi" ]
	  then
		  elvi="$arg"
	  else
		  if [ -z "$searchterms" ]
		  then
			  searchterms="`quote "$arg"`"
			  unquoted_searchterms="$arg"
		  else
			  searchterms="$searchterms `quote "$arg"`"
			  unquoted_searchterms="$unquoted_searchterms $arg"
		  fi
	  fi
	done
	if [ -z "$elvi" ]
	then
		surfraw_usage
		exit 0
	else
		localelvidir=$(get_local_elvi_dir)
		if [ -x "$localelvidir/$elvi" ]
		then
			sh -c "$localelvidir/$elvi $opts $searchterms"
		elif [ -x "$elvidir/$elvi" ]
		then
 			sh -c "$elvidir/$elvi $opts $searchterms"
		else
			bookmark=`bookmark_lookup $elvi`
			if [ -n "$bookmark" ]
			then
                w3_parse_args $unquoted_opts $unquoted_searchterms
                bookmark=$(parse_bookmark)
                w3_browse_url "$bookmark"
                exit 0
			else
				echo "`basename $0`: $elvi: No elvis or bookmark with that name"
				echo "Passing everything to browser and hoping for the best..."
                $BROWSER "$elvi $opts $unquoted_searchterms"
                exit 0
			fi
	   fi
	fi
fi