jptgdp: Correct dependencies, adjust help text

jptgdp

@@ -57,15 +57,17 @@ helptext() {
 	cat << EOF
 Usage: $_name [OPTION]
 Use youtube-dl and audacious to queue up a playlist given a file of only search
-queries.
-  -f <file>		The playlist file to load
+queries. The first result found is the one that will be downloaded. Downloaded
+files are cached in your Music folder under "JPTGDP Songs" for offline use.
+  -f <file>		The playlist file to load. The file should be plaintext
+			containing a YouTube search query on each line
 
   -c			Clears the cache (which can become quite large)
   -d			Download only; don't queue anything up
   -s			Shuffle the playlist
 
   -r <directory>	Start up rofi, if installed, and present a listing of
-			all .ytp files in the given directory
+			all .gdp files in the given directory
 
   -h			Print this help text
 
@@ -115,7 +117,7 @@ playlist() {
 # Main
 main() {
 	# Boostrapping and setup
-	validatedeps basename mktemp || error "Critical dependency $_return was not met" 1
+	validatedeps youtube-dl basename || error "Critical dependency $_return was not met" 1
 	mkdir -p "$_tmpdir"
 	mkdir -p "$_musicdir"
 	trap trapexit EXIT