added ability to download a file using cat

clite/commands.js

@@ -77,11 +77,34 @@ Options:
 
 clite.commands.load('cat',function(args,env,io) {
 	var files = [];
+	var download = false;
 	var pending = 0;
 
+	function help() {
+		io.write(`
+Usage: cat [OPTION] <FILE> [FILE]
+
+Options:
+-?	Print this help information
+-d	Download the file data, instead of printing it
+		`);
+	}
+
 	for (var i=1; i<args.length; i++) {
 		if (args[i][0] == '-') {
-			io.error('unknown argument: '+args[i]);
+			for (var j=1; j<args[i].length; j++) {
+				switch (args[i][j]) {
+				case '?':
+					help();
+					return 0;
+					break;
+				case 'd':
+					download = true;
+					break;
+				default:
+					io.error('unknown argument: '+args[i]);
+				}
+			}
 		}else if (args[i][0] == '/') {
 			files.push(args[i]);
 		}else{
@@ -99,7 +122,18 @@ clite.commands.load('cat',function(args,env,io) {
 		}else{
 			var d = clite.io.readAll(fd);
 			if (d != null) {
-				io.write(d);
+				if (download) {
+					var link = document.createElement("a");
+					link.target = '_blank';
+					link.download = fd.node.name;
+					var blob = new Blob([d], {type: "text/plain"});
+					link.href = URL.createObjectURL(blob);
+					document.body.appendChild(link);
+					link.click();
+					document.body.removeChild(link);
+				}else{
+					io.write(d);
+				}
 			}
 		}
 		pending--;
@@ -128,9 +162,5 @@ clite.commands.load('cat',function(args,env,io) {
 	return null;
 });
 
-clite.commands.load('download',function(args,env,io) {
-	return 0;
-});
-
 // insert commands above this line
 }