Add ability to pass command-line arguments to pyret program

.gitignore

@@ -1,3 +1,6 @@
 *.sw*
 node_modules
 pyret-lang
+package-lock.json
+.pyret
+*.jarr

.travis.yml

@@ -10,4 +10,4 @@ deploy:
   provider: npm
   email: [email protected]
   api_key:
-    secure: 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
+    secure: "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"

ahoy-world-args.arr

@@ -0,0 +1,7 @@
+import cmdline-lib as CL
+args = CL.command-line-arguments()
+if args.length() >= 2:
+    print("Ahoy " + args.get(1) + "!\n")
+else:
+    print("Ahoy world!\n")
+end

client-lib.js

@@ -121,9 +121,9 @@ function start(options) {
     //process.exit(0);
   }
 
-  function runProgram(path) {
-    log("Executing program: ", path);
-    const proc = childProcess.spawn("node", [path], {stdio: 'inherit'});
+  function runProgram(path, argv) {
+    log("Executing program: ", path, " with ", argv);
+    const proc = childProcess.spawn("node", [path].concat(argv), {stdio: 'inherit'});
     proc.on('close', function(code) {
       process.exit(code);
     });
@@ -176,12 +176,15 @@ function start(options) {
         else if(parsed.type === "compile-success") {
           log("Successful compile response");
           if(!options.meta.norun) {
-            process.nextTick(() => runProgram(options["pyret-options"]["outfile"]));
+            var argv = options["_unknown"] || [];
+            if (argv.length > 0 && argv[0] == "--") {
+              argv = argv.slice(1);
+            }
+            process.nextTick(() => runProgram(options["pyret-options"]["outfile"], argv));
           }
         }
       });
 
-
       var forMessage = { command: "compile", compileOptions: JSON.stringify(options['pyret-options']) };
       client.send(JSON.stringify(forMessage));
     });

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pyret-npm",
-  "version": "0.0.17",
+  "version": "0.0.28-alpha",
   "description": "The CLI for the Pyret programming language",
   "files": [
     "pyret.js",

pyret.js

@@ -30,7 +30,6 @@ const usages = [
       '',
       '',
       '  This command compiled and ran {underline ahoy-world.arr}. The first time, this will take a few seconds as a server starts up in the background, in order to make future compiles fast.',
-
       '',
       '',
       '  It\'s worth noting that the file is compiled into a standalone JavaScript file with the {underline .jarr} extension:',
@@ -42,7 +41,34 @@ const usages = [
       '',
       '',
       '  Most uses (e.g. for homework) only need to use the {bold pyret} command directly on {underline .arr} files, but there are several other options that can be provided.',
-
+      '',
+      '',
+      '  You can pass arguments to your pyret program by adding {bold --} followed by the command-line arguments:',
+    ]
+  },
+  {
+    content: {
+      options: {
+        noTrim: true
+      },
+      data: [
+        {col: '$ cat ahoy-world-args.arr'},
+        {col: 'import cmdline-lib as CL'},
+        {col: 'args = CL.command-line-arguments()'},
+        {col: 'if args.length() >= 2:'},
+        {col: '  print("Ahoy " + args.get(1) + "!\\\\n")'},
+        {col: 'else:'},
+        {col: '  print("Ahoy world!\\\\n")'},
+        {col: 'end'},
+        {col: '$ pyret -qk ahoy-world-args.arr {bold -- Captain}'},
+        {col: 'Ahoy Captain!'},
+      ]
+    }
+  },
+  {
+    content: [
+      '',
+      '  This command suppresses the progress indication, disables checks, and passes one command-line argument to {underline ahoy-world-args.arr}: {bold "Captain"} (index 1). The {bold "--"} argument is only needed so that {bold pyret} does not interpret it. It should be noted that the index 0 argument contains the path to the compiled {underline .jarr} file.',
     ]
   },
   {
@@ -253,7 +279,7 @@ function printVersion() {
 }
 
 try {
-  options = commandLineArgs(optionDefinitions);
+  options = commandLineArgs(optionDefinitions, {stopAtFirstUnknown: true});
   if(options.meta.help) {
     printUsage();
     process.exit(0);
@@ -276,5 +302,9 @@ if(!options["pyret-options"]["outfile"] && options["pyret-options"]["program"])
   }
 }
 
-pyretClient.start(options);
+if (options["_unknown"] && !options["pyret-options"]["program"]) {
+  printUsage();
+  process.exit(1);
+}
 
+pyretClient.start(options);