add features to trss

trss is an rss feed reader. I've added the ability to subscribe to feeds, see the entries therein, and browse the entries via lynx.

One thing left to do is to add functionality for opening the entry url in a web browser.
Other than this, just general error checking is required, and a sweep of the code for beautification and performance.

sh/trss

@@ -3,6 +3,7 @@
 # get configuration & data directories
 DATA="$HOME/.cache/trss"
 CONFIG="$HOME/.config/trss"
+MODE=""
 
 # make sure these directories are in place
 mkdir -p "$DATA"
@@ -24,7 +25,7 @@ synchronize () {
 
 		# generate sfeed formatted file
 		printf "> creating sfeed compound feed file for feed %s\n" "$i"
-		cat "$DATA/${i}.xml" | sfeed | cat - "$DATA/${i}.sfeed" | uniq >> "$DATA/${i}.tmp.sfeed"
+		cat "$DATA/${i}.xml" | sfeed | cat - "$DATA/${i}.sfeed" | sort -u | sort -r -k 1 >> "$DATA/${i}.tmp.sfeed"
 		mv "$DATA/${i}.tmp.sfeed" "${DATA}/${i}.sfeed"
 	done
 }
@@ -33,7 +34,104 @@ get_feed_attr () {
 	eval "printf '%s' \${$1_$2}"
 }
 
+cli_loop () {
+	read -p "$MODE\$ " input
+	case "$input" in
+		"ls"*)
+			ls_handler $input
+			;;
+		"cd"*)
+			cd_handler $input
+			;;
+		"cat"*)
+			cat_handler $input
+			;;
+		"sync"*)
+			sync_handler $input
+			;;
+		"set"*)
+			set_handler $input
+			;;
+	esac
+}
+
+ls_handler () {
+	if [ -z "$MODE" ]; then
+		# just list all the feeds
+		for i in $FEEDS; do
+			printf "%s\n" "$i"
+		done
+	else
+		# we have to list all the items in the feed
+		# check first if feed is downloaded
+		if [ -f "$DATA/${MODE}.sfeed" ]; then
+			awk -F'\t' '{ print $2 }' "$DATA/${MODE}.sfeed"
+		else
+			printf "synchronization of feed %s required\n" "$MODE"
+		fi
+	fi
+}
+
+cd_handler () {
+	if [ -z "$MODE" ]; then
+		# we're in the home state
+		[ -z "$2" ] && return
+		[ "$2" = ".." ] && return
+
+		# check if $2 is a valid feed
+		j=0
+		for i in $FEEDS; do
+			[ "$2" = "$i" ] && j=1
+		done
+
+		if [ "$j" -ne 1 ]; then
+			printf "trss: couldn't find feed %s\n" "$2"
+			return
+		fi
+
+		# set the $MODE to the feed
+		MODE="$2"
+	else
+		# we're in an individual feed
+		[ -z "$2" ] && MODE="" && return
+		[ "$2" = ".." ] && MODE="" && return
+
+		printf "trss: couldn't find feed %s\n" "$2"
+	fi
+}
+
+sync_handler () {
+	synchronize
+}
+
+set_handler () {
+	printf "stub, use +x or -x to disable/enable debug output\n"
+}
+
+cat_handler () {
+	realargs="$(printf '%s\n' "$@" | tr '\n' ' ' | sed 's/^cat //g;s/ $//g')"
+	[ -z "$MODE" ] && printf "couldn't find entry matching %s\n" "$realargs"
+	results="$(awk -F'\t' -v pat="$realargs" '$2 ~ pat { print $0 }' "$DATA/${MODE}.sfeed")"
+
+	OLDIFS="$IFS"
+	IFS="
+"
+
+	for i in $results; do
+		entry="$(printf "%s" "$i" | awk -F'\t' '{ print $4 }')"
+
+		printf "%s\n" "$entry" |
+			sed -e 's|\\n|\n|g' -e 's|\\t|\t|g' |
+			lynx -stdin
+
+		IFS="$OLDIFS"
+		return
+	done
+
+	printf "couldn't find any entries matching %s\n" "$realargs"
+}
+
 import_information
-synchronize
-printf "%s\n" "$FEEDS"
-get_feed_attr seirdy humanname
+while true; do
+	cli_loop
+done