sup usage function

sup

@@ -13,11 +13,33 @@ cfg_screenshot_ext='png'
 
 [[ -f $HOME/.suprc ]] && { source "$HOME/.suprc"; }
 
+_cat() {
+	while read; do
+		printf '%s\n' "$REPLY"
+	done
+}
+
 sup.msg() { printf '%s\n' "[sup] $1"; }
 sup.err() { sup.msg "(error) $1" >&2; }
 
 sup.usage() {
-	printf '%s\n' "Usage: ${_self} [-RsF] [-D num] [file/url]"
+	_cat <<- EOF
+		Usage: ${_self} [-RsF] [-D num] [file/url]"
+		    Flags:
+		        -R                   # Remove the file after uploading.
+		        -s                   # Make a screenshot and upload it instead of a file.
+		        -F                   # Make a fullscreen shot instead of prompting for a window/area. Implies -s.
+		        -D <num>             # Delay the shot by <num> seconds.
+		        -p                   # Make the file private. Requires \$secret to be set in the config.
+		
+		    Config options (~/.suprc):
+		        secret               # Your personal token. Get it at https://zfh.so/settings_form
+		        cfg_screenshot_ext   # Screenshot file type, used by scrot.
+		        # Others are self-explanatory:
+		        cfg_url_regex
+		        cfg_tmp_dir
+		        cfg_script_url
+	EOF
 }
 
 sup.env() {
@@ -131,8 +153,11 @@ main() {
 			-R|--remove-file) flag_rm='1';;
 			
 			-s|--screenshot) flag_scrot='1';;
-			-F|--fullscreen) flag_scrot_fullscreen='1';;
 			-D|--screenshot-delay) cfg_scrot_delay="$2"; shift;;
+			-F|--fullscreen)
+				flag_scrot='1'
+				flag_scrot_fullscreen='1'
+			;;
 			
 			-h|--help|--usage) sup.usage; return;;