make some things better

xdg-sanity.sh

@@ -1,17 +1,25 @@
 #!/bin/sh
 
-echo "Determining MIME type of $1:"
+argv0="$0"
 
-MIME=$(curl -I -s "$1" | sed -n -e 's/^[cC]ontent-[tT]ype: //p' | sed -e 's/;.\+//g' | tr -d '\r')
+if ! test -n "$1"; then
+	printf "Usage: %s [resource...]\n" "$argv0"
+	exit 64 # sysexits(3) EX_USAGE
+fi
 
-echo $MIME
+test -n "$BROWSER" || BROWSER=$(cat /etc/xdg-sanity.conf | sed -n -e 's/^browser = //p' )
 
-BROWSER=$(cat /etc/xdg-sanity.conf | sed -n -e 's/^browser = //p' )
+if ! command -v curl >/dev/null 2>&1; then
+	printf "%s: Missing dependency: curl(1)\n" "$argv0"
+	exit 71 # sysexits(3) EX_OSERR
+fi
 
-if [ "$MIME" = "text/html" ]
-then
-$BROWSER $1
+MIME="$(curl -s -o /dev/null -w '%{content_type}' $1 | sed 's/\;.*//' | xargs echo)"
 
+# determine the MIME type, strip everything after the first semicolon, and
+# check to see if it's HTML
+if [ "$MIME"= "text/html" ]; then
+	$BROWSER $1
 else
-handlr launch "$MIME" -- "$1"
-fi
+	handlr launch "$MIME" -- "$1"
+fi