Add task to cross compile on darwin and linux

gh_task.go

@@ -8,7 +8,35 @@ import (
 	"runtime"
 )
 
-// Cross-compiles gh
+// Cross-compiles gh for all supported platforms.
+//
+// Cross-compiles gh for all supported platforms. The build artifacts
+// will be in target/VERSION. This only works on darwin with Vagrant setup.
+func TaskCrossCompileAll(t *tasking.T) {
+	t.Log("Removing build target...")
+	err := os.RemoveAll("target")
+	if err != nil {
+		t.Errorf("Can't remove build target: %s\n", err)
+		return
+	}
+
+	// for darwin
+	t.Log("Compiling for darwin...")
+	TaskCrossCompile(t)
+	if t.Failed() {
+		return
+	}
+
+	// for linux
+	t.Log("Compiling for linux...")
+	err = t.Exec("vagrant ssh -c 'cd ~/src/github.com/jingweno/gh && git pull origin master && gotask cross-compile'")
+	if err != nil {
+		t.Errorf("Can't compile on linux: %s\n", err)
+		return
+	}
+}
+
+// Cross-compiles gh for current operating system.
 //
 // Cross-compiles gh for current operating system. The build artifacts will be in target/VERSION
 func TaskCrossCompile(t *tasking.T) {
@@ -19,14 +47,7 @@ func TaskCrossCompile(t *tasking.T) {
 		return
 	}
 
-	t.Log("Removing build target...")
-	err = os.RemoveAll("target")
-	if err != nil {
-		t.Errorf("Can't remove build target: %s\n", err)
-		return
-	}
-
-	t.Log("Cross-compiling gh...")
+	t.Log("Cross-compiling gh for mac...")
 	err = t.Exec("goxc", "-wd=.", "-os="+runtime.GOOS, "-c="+runtime.GOOS)
 	if err != nil {
 		t.Errorf("Can't cross-compile gh: %s\n", err)