chan-dl: more generic defaults, remove http*://, some cleanup

bin/chan-dl

 #!/bin/sh
-#4format:  48chdl https://boards.4chan.org/.../thread/.../...
-#8format:  48chdl https://8ch.net/.../res/.../...
+#format:  chan-dl [link]
+
+DIRNAME=$(echo "$@" | sed -r 's/.+\:\/\///')
+mediaserver=
 
 case "$@" in
-  (*'4chan.org'*) DIRNAME=$(echo "$@" | sed -r 's/.+s\.(4chan).+g\/(.+)\/.+d\/(.+.)/\1\/\2-\/\3/') ; mediaserver=4chan.org ;;
-  (*'8ch.net'*) DIRNAME=$(echo "$@" | sed -r 's/.+\/(8ch).+(\/.+\/).+\/(.+)\..+/\1an\2\3/') ; mediaserver=media.8ch.net ;;
+  (*'4chan.org'*) DIRNAME=$(echo "$@" | sed -r 's/.+s\.(4chan).+g\/(.+)\/.+d\/(.+.)/\1\/\2-\/\3/') ; mediaserver="4chan.org" ;;
+  (*'8ch.net'*) DIRNAME=$(echo "$@" | sed -r 's/.+\/(8ch).+(\/.+\/).+\/(.+)\..+/\1an\2\3/') ; mediaserver="media.8ch.net" ;;
 esac
-wget -P "$DIRNAME" -nd -c -r -R '*\.html','*s\.*' -l 1 -H -D "$mediaserver" -A png,gif,jpg,jpeg,webm "$@"
+
+wget -P "$DIRNAME" -nd -c -r -R '*\.html','*s\.*' -l 1 -H -D "$mediaserver" \
+	-A png,gif,jpg,jpeg,webm "$@"
+
 exit 0
 
 #* TODO skip thumbnails and other junk (to save bandwidth and time)