use module command to get solc version

lib/modules/solidity/solcW.js

@@ -1,7 +1,6 @@
 let utils = require('../../utils/utils.js');
 let solcProcess;
 let compilerLoaded = false;
-var Npm = require('../../pipeline/npm.js');
 let currentSolcVersion = require('../../../package.json').dependencies.solc;
 
 class SolcW {
@@ -27,17 +26,17 @@ class SolcW {
 
     this.events.request("version:get:solc", function(solcVersion) {
       self.logger.info("detected version is " + solcVersion);
-      if (self.solcVersion === currentSolcVersion) {
+      if (solcVersion === currentSolcVersion) {
         solcProcess.send({action: 'loadCompiler', solcLocation: 'solc'});
       } else {
-        let npm = new Npm({logger: self.logger});
+        self.events.request("version:getPackage:solc", solcVersion, function(err, location) {
-        npm.getPackageVersion('solc', solcVersion, false, false, function(err, location) {
           if (err) {
             return done(err);
           }
           let requirePath = utils.joinPath(process.env.PWD, location);
           solcProcess.send({action: 'loadCompiler', solcLocation: requirePath});
         });
+
       }
     });
   }

lib/versions/library_manager.js

@@ -1,3 +1,4 @@
+var Npm = require('../pipeline/npm.js');
 
 class LibraryManager {
 
@@ -11,7 +12,8 @@ class LibraryManager {
     this.determineVersions();
 
     this.registerCommands();
-    this.listenToCommands();
+    this.listenToCommandsToGetVersions();
+    this.listenToCommandsToGetLibrary();
   }
 
   determineVersions() {
@@ -40,7 +42,7 @@ class LibraryManager {
     });
   }
 
-  listenToCommands() {
+  listenToCommandsToGetVersions() {
     const self = this;
     for (let libName in this.versions) {
       let lib = self.versions[libName];
@@ -50,6 +52,14 @@ class LibraryManager {
     }
   }
 
+  listenToCommandsToGetLibrary() {
+    let libName = "solc";
+    let npm = new Npm({logger: this.embark.logger});
+    this.embark.events.setCommandHandler('version:getPackage:' + libName, (version, cb) => {
+      npm.getPackageVersion('solc', version, false, false, cb);
+    });
+  }
+
 }
 
 module.exports = LibraryManager;

test/compiler.js

@@ -14,7 +14,6 @@ var solcVersion = "0.4.17";
 
 var TestEvents = {
   request: (cmd, cb) => {
-    console.log("hello!");
     cb(solcVersion)
   }
 };