creating a plugin to generate md5 digest files

examples/server.js

@@ -6,6 +6,8 @@ var assembler = assembly.createAssembler({src : __dirname + "/src", dest: __dirn
 assembler.use(assembly.processors.pathify);
 assembler.use(assembly.processors.amdify);
 // assembler.use(assembly.plugins.gzip);
+// assembler.use(assembly.plugins.digest);
+
 assembler.start();
 
 server.use(assembler.server());

lib/assembly/plugins/digest.js

@@ -0,0 +1,40 @@
+// attach to listen for gzip events and write out a gzipped file
+var utile = require('utile'),
+    path = require('path'),
+    fs = require('fs');
+
+exports.attach = function (options) {
+  var manager = this;
+
+  manager.on("digest", generateDigest.bind(manager));
+};
+
+function generateDigest(srcFile, data) {
+  var manager = this;
+
+  manager.core.md5sum(srcFile, function(err, md5sum) {
+    if(err) return;
+
+    var digestFile = manager.core.buildPath(srcFile, {fullpath : true, version: md5sum});
+
+    writeFile.call(manager, digestFile, data, function(err) {
+      manager.log.info("compiled digest of" + srcFile + " to " + digestFile);
+    });
+  });
+}
+
+function writeFile(digestFile, data, callback) {
+  var manager = this;
+
+  utile.mkdirp(path.dirname(digestFile), function(err){
+    if(err) return callback(err);
+
+    fs.writeFile(digestFile, data, function(err){
+      if(err) return callback(err);
+
+      manager.emit("gzip", digestFile);
+
+      return callback(null, digestFile);
+    });
+  });
+}

lib/assembly/worker.js

@@ -117,6 +117,7 @@ Worker.prototype.write = function(srcFile, data, cb) {
     fs.writeFile(outputFile, data, function(err){
       if(err) return cb(err);
 
+      self.manager.emit("digest", srcFile, data);
       self.manager.emit("gzip", outputFile);
       self.manager.log.info("compiled " + srcFile + " to " + outputFile);
       return cb(null, data);