+#!/bin/sh
+
+if [ "$(COOKIE nick)" ]; then
+ nickname="?$(COOKIE nick)"
+else
+ nickname='?Guest'
+fi
+
+if [ -f "$chatfile" ]; then
+ read -r channelkey x <"$chatfile"
+ channelkey="$( printf '%s-%s' "$channelkey" "$SESSION_ID" |sha256sum)"
+fi
+
+case $(POST action) in
+ create)
+ if [ ! -f "$chatfile" ]; then
+ { randomid; printf ' '; STRING "$nickname"; echo; } >"$chatfile"
+ fi
+ REDIRECT "$(URL "/$LOCATION")"
+ ;;
+ submit)
+ if [ -f "$chatfile" -a "$channelkey" = "$(POST channelkey)" ]; then
+ printf "%s %s: %s\n" "$(date +%F_%T)" "$(STRING "$nickname")" "$(POST message |STRING)" >>"$chatfile"
+ fi
+ REDIRECT "$(URL "/$LOCATION")"
+ ;;
+ nick)
+ SET_COOKIE +1209600 "nick=$(POST nickname |URL)"
+ REDIRECT "$(URL "/$LOCATION")"
+ ;;
+ *) if [ ! -f "$chatfile" ]; then
+ yield_page create <<-EOF
+ [form #nonexist method=POST action="$(URL "/$LOCATION")"
+ There is no channel named $(HTML "$LOCATION")
+ [submit "action" "create" Create]
+ ]
+ EOF
+ else
+ { printf '
+ [form #channel method=POST action="%s"
+ [submit "action" "submit" style="display: none;"]
+ [input type=hidden name=channelkey value="%s"]
+ %s [input name="message" autofocus=true][submit "action" "submit" Send!]
+ ]
+ ' "$(URL "/$LOCATION")" "$channelkey" "$(settings_menu)"
+ SHESCAPE='s;[]&<>#."[];\\&;g;'
+
+ printf '[div #chat'
+ # tail -n30 -f "$chatfile" | {
+ # read x
+ # while read -r date nick message; do
+ # printf '[p .message [span .date %s] [span .nick [span .indicator %s]%s:] [span .message %s]]\n' \
+ # "${date#*_}" "${nick%${nick#?}}" "$(UNSTRING "${nick#?}" |HTML)" "$(UNSTRING "$message" |HTML)"
+ # done
+ # }
+ tail -n50 -f "$chatfile" \
+ | sed -nuE '
+ /^[^ ]+ [^ ]+ [^ ]+$/{
+ h; s;^([^ ]+) ([^ ]+) ([^ ]+)$;\1;; s;.*_;;; s;.+;[p .message [span .date &];p;
+ g; s;^([^ ]+) ([^ ]+) ([^ ]+)$;a\2;; bESC; :A s;.;;; s;(.)(.+);[span .nick [span .indicator \1]\2];p;
+ g; s;^([^ ]+) ([^ ]+) ([^ ]+)$;b\3;; bESC; :B s;.;;; s;.+;[span .message &]];p;
+ }
+ b; :ESC
+ '"$UNSTRING"' '"$SHESCAPE"'
+ /^a/bA; /^b/bB;
+ '
+ } |yield_page channel
+ fi
+ ;;
+esac