Add solc.semver() method to get a consistent version number in all cases

Author: axic

README.md

@@ -89,6 +89,10 @@ The `compile()` method always returns an object, which can contain `errors`, `so
 
 Starting from version 0.4.11 there is a new entry point named `compileStandardWrapper()` which supports Solidity's [standard JSON input and output](https://solidity.readthedocs.io/en/develop/using-the-compiler.html#compiler-input-and-output-json-description). It also maps old compiler output to it.
 
+#### From version 0.4.20
+
+Starting from version 0.4.20 a Semver compatible version number can be retrieved on every compiler release, including old ones, using the `semver()` method.
+
 ### Using with Electron
 
 **Note:**

test/package.js

@@ -6,6 +6,10 @@ tape('Version and license', function (t) {
     st.equal(typeof solc.version(), 'string');
     st.end();
   });
+  t.test('check semver', function (st) {
+    st.equal(typeof solc.semver(), 'string');
+    st.end();
+  });
   t.test('check license', function (st) {
     st.ok(typeof solc.license() === 'undefined' || typeof solc.license() === 'string');
     st.end();

wrapper.js

@@ -157,6 +157,10 @@ function setupMethods (soljson) {
 
   var version = soljson.cwrap('version', 'string', []);
 
+  var versionToSemver = function () {
+    return translate.versionToSemver(version());
+  };
+
   var license = function () {
     // return undefined
   };
@@ -167,6 +171,7 @@ function setupMethods (soljson) {
 
   return {
     version: version,
+    semver: versionToSemver,
     license: license,
     compile: compile,
     compileStandard: compileStandard,