Add support for passing password as a command line argument

index.js

@@ -3,9 +3,28 @@ var fs        = require("fs");
 var prompt    = require("prompt");
 var path      = require("path");
 
+function runCrypto(fn, from, to, password, finished) {
+  from = fs.createReadStream(from);
+  to   = fs.createWriteStream(to);
+  fn   = fn("cast5-cbc", password);
+
+  from.pipe(fn).pipe(to);
+  from.on("end", function () {
+    console.log("done");
+  });
+}
+
 module.exports = function(fn) {
   var from = path.join(process.cwd(), process.argv[2]);
   var to   = path.join(process.cwd(), process.argv[3]);
+  var password = process.argv[4];
+
+  if (password) {
+    runCrypto(fn, from, to, password);
+    return;
+  }
+
+  // Password isn't given in the command line, read it from prompt
 
   prompt.start();
 
@@ -22,15 +41,9 @@ module.exports = function(fn) {
     if (err) {
       console.log(err);
     } else {
-      from = fs.createReadStream(from);
-      to   = fs.createWriteStream(to);
-      fn   = fn("cast5-cbc", result.password);
+      prompt.stop();
 
-      from.pipe(fn).pipe(to);
-      from.on("end", function () {
-        console.log("done");
-        prompt.stop();
-      });
+      runCrypto(fn, from, to, result.password);
     }
   });
 };