--- /dev/null
+#!/bin/sh
+
+# Copyright 2023, 2024 Paul Hänsch
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+# IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+I="$_DATA/index"
+
+. "$_EXEC/cgilite/cgilite.sh"
+. "$_EXEC/cgilite/storage.sh"
+. "$_EXEC/cgilite/db23.sh"
+. "$_EXEC/tools.sh"
+. "$_EXEC/acl.sh"
+
+_(){ printf %s\\n "$*"; }
+[ "${LANGUAGE}" -a -r "${_EXEC}/l10n/${LANGUAGE}.sh" ] && . "${_EXEC}/l10n/${LANGUAGE}.sh"
+
+show_form=true show_hits='' action=''
+
+set -- "$@" --
+while [ $# -gt 0 ]; do case $1 in
+ --no-form|--noform)
+ show_form=''; shift 1;;
+ --hits|--results)
+ show_hits='true'; shift 1;;
+ --action)
+ action="$(HTML "$2")"; shift 2;;
+ --action=*|action=*)
+ action="$(HTML "${2#*=}")"; shift 1;;
+ --) shift 1; break;;
+ *) set -- "$@" "$1"; shift 1;;
+esac; done
+
+searchteaser() {
+ local file="$1" words db3_data
+ local w l nc nl hits mhits cont mcont
+ shift 1; words="$*"
+
+ for w in ${words}; do
+ grep -hiwnF "$w" "$file"
+ done \
+ | sort -t: -k1 -n \
+ | { nc=-1 hits=0 mhits=0
+ while read -r l; do
+ nl="$nc" nc="${l%%:*}"
+ if [ $nc -eq $nl ]; then
+ hits=$((hits + 1))
+ elif [ $nc -eq $((nl + 1 )) ]; then
+ hits=$((hits + 1))
+ cont="${cont}${BR}${l#*:}"
+ elif [ $hits -gt $mhits ]; then
+ mhits="$hits" mcont="$cont"
+ hits=1 cont="${l#*:}"
+ else
+ hits=1 cont="${l#*:}"
+ fi
+ done
+
+ [ $hits -gt $mhits ] \
+ && STRING "$cont" \
+ || STRING "$mcont"
+ }
+}
+
+if [ ! "$action" -a "$LANGUAGE_DEFAULT" ]; then
+ action="./:${LANGUAGE}/[search]"
+elif [ ! "$action" ]; then
+ action="./[search]"
+fi
+
+if [ "${show_form}" = true ]; then
+ printf '<form class="macro search" method="GET" action="%s">
+ <input type="search" placeholder="%s" name="q" value="%s"><button type="submit" class="search">%s</button>
+</form>' "$action" "$(_ Search)" "$([ "$show_hits" = true ] && GET q |HTML)" "$(_ Search)"
+fi
+
+if [ "${show_hits}" = true ]; then
+ { read tags; read ntags; read words; } <<-EOF
+ $(GET q | awk '
+ BEGIN { # Field separator FS should include punctuation, including Unicode Block U+2000 - U+206F
+ if ( length("¡") == 1 ) # Utf-8 aware AWK
+ FS = "([] \\t\\n\\r\"'\''()*+,./:;<=>?\\\\^_`{|}~[-]|%[0-9A-Fa-f]{2}|'"$(printf '[\342\200\200-\342\201\257]')"')+";
+ else # UTF-8 Hack
+ FS = "([] \\t\\n\\r\"'\''()*+,./:;<=>?\\\\^_`{|}~[-]|%[0-9A-Fa-f]{2}|'"$(printf '\342\200[\200-\277]|\342\201[\201-\257]')"')+";
+ fi
+ }
+ { t=0; for (n = 1; n <= NF; n++) if ($n ~ /#[[:alnum:]_]+/) tags[t++] = toupper($n);
+ t=0; for (n = 1; n <= NF; n++) if ($n ~ /![[:alnum:]_]+/) ntags[t++] = toupper($n);
+ t=0; for (n = 1; n <= NF; n++) if ($n !~ /![[:alnum:]_]+/) words[t++] = tolower($n);
+ for (t in tags) { sub(/^#/, "", tags[t]); printf "%s ", tags[t]; } print "";
+ for (t in ntags) { sub(/^!/, "", ntags[t]); printf "%s ", ntags[t]; } print "";
+ for (t in words) { sub(/^[!#]/, "", words[t]); printf "%s ", words[t]; } print "";
+ }
+ ')
+ EOF
+
+ printf '<ul class="macro search hits">'
+ for w in ${words}; do
+ [ ! -f "$I/$w" ] && continue
+
+ while read date doc freq num total; do
+ P="$_DATA/pages$(UNSTRING "$doc")"
+ d="$(stat -c %Y -- "$P/#index.flag" 2>&-)"
+ [ "$d" -le "$date" -a -f "$P/#page.md" ] 2>&- || continue
+
+ printf '%s %f\n' "$doc" "$freq"
+ done <"$I/$w"
+ done \
+ | awk '
+ { cnt[$1]++; weight[$1] = weight[$1] ? weight[$1] + $2 : $2; }
+ END { m = 0; for (d in cnt) m = ( m < cnt[d] ) ? cnt[d] : m;
+ for (d in cnt) if ( cnt[d] == m ) printf "%f %s\n", weight[d], d;
+ }
+ ' \
+ | sort -nr \
+ | while read freq doc; do
+ page="$(UNSTRING "$doc")"
+ [ "${page%*/\[*\]/*}" != "$page" ] && continue
+ if [ "$LANGUAGE_DEFAULT" ]; then
+ [ -d "${_DATA}/pages/${page}/:${LANGUAGE}/" ] && continue
+ [ "${page%/:*/}" = "${page%/:${LANGUAGE}/}" ] || continue
+ fi
+ acl_read "$page" || continue
+ has_tags "$page" $tags || continue
+ has_tag "$page" $ntags && continue
+ printf '%s %s\n' "$doc" "$(searchteaser "$(mdfile "$page")" $words)"
+ done \
+ | while read -r p t; do
+ path="$(UNSTRING "$p")" pfrag="${path%/}" title=''
+ while [ "$pfrag" ]; do
+ title="$(page_title "$pfrag")/$title"
+ pfrag="${pfrag%/*}"
+ done
+ printf '<li><a href="%s">%s</a><p>%s</p></li>' \
+ "$(URL "$path")" "$(HTML "/$title")" "$(UNSTRING "$t" |HTML)"
+ done
+ printf '</ul>'
+fi
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