Implement Process.version (#42)

* Implement `Process.version`
* Update`os` test suite

src/cli/modules.c

@@ -25,6 +25,7 @@ extern void fileWriteBytes(WrenVM* vm);
 extern void platformIsPosix(WrenVM* vm);
 extern void platformName(WrenVM* vm);
 extern void processAllArguments(WrenVM* vm);
+extern void processVersion(WrenVM* vm);
 extern void processCwd(WrenVM* vm);
 extern void statPath(WrenVM* vm);
 extern void statBlockCount(WrenVM* vm);
@@ -166,6 +167,7 @@ static ModuleRegistry modules[] =
     END_CLASS
     CLASS(Process)
       STATIC_METHOD("allArguments", processAllArguments)
+      STATIC_METHOD("version", processVersion)
       STATIC_METHOD("cwd", processCwd)
     END_CLASS
   END_MODULE

src/module/os.c

@@ -71,6 +71,12 @@ void processAllArguments(WrenVM* vm)
   }
 }
 
+
+void processVersion(WrenVM* vm) {
+  wrenEnsureSlots(vm, 1);
+  wrenSetSlotString(vm, 0, WREN_VERSION_STRING);
+}
+
 void processCwd(WrenVM* vm)
 {
   wrenEnsureSlots(vm, 1);

src/module/os.wren

@@ -10,5 +10,6 @@ class Process {
   static arguments { allArguments[2..-1] }
 
   foreign static allArguments
+  foreign static version
   foreign static cwd
 }

src/module/os.wren.inc

@@ -12,5 +12,6 @@ static const char* osModuleSource =
 "  static arguments { allArguments[2..-1] }\n"
 "\n"
 "  foreign static allArguments\n"
+"  foreign static version\n"
 "  foreign static cwd\n"
 "}\n";

test/os/process/version.wren

@@ -0,0 +1,7 @@
+import "os" for Process
+
+System.print(Process.version is String) // expect: true
+System.print(Process.version.isEmpty) // expect: false
+
+var isNumber = Fn.new {|str| Num.fromString(str) != null }
+System.print(Process.version.split(".").all(isNumber)) // expect: true