Initial rewrite of revel/cmd to provide vendor support and enhanced CLI options

revel/version.go

@@ -12,7 +12,14 @@ import (
 	"fmt"
 	"runtime"
 
-	"github.com/revel/revel"
+	"github.com/revel/cmd/model"
+	"go/build"
+	"go/token"
+	"go/parser"
+	"go/ast"
+	"io/ioutil"
+	"path/filepath"
+	"github.com/revel/cmd/utils"
 )
 
 var cmdVersion = &Command{
@@ -28,11 +35,46 @@ For example:
 }
 
 func init() {
-	cmdVersion.Run = versionApp
+	cmdVersion.RunWith = versionApp
 }
 
-func versionApp(args []string) {
-	fmt.Printf("Version(s):")
-	fmt.Printf("\n   Revel v%v (%v)", revel.Version, revel.BuildDate)
+// Displays the version of go and Revel
+func versionApp(c *model.CommandConfig) {
+	revelPkg, err := build.Import(model.RevelImportPath, c.Version.ImportPath, build.FindOnly)
+	if err != nil {
+		utils.Logger.Errorf("Failed to find Revel with error:", "error", err)
+	}
+
+
+	fset := token.NewFileSet() // positions are relative to fset
+
+
+	version, err := ioutil.ReadFile(filepath.Join(revelPkg.Dir,"version.go"))
+	if err != nil {
+		utils.Logger.Errorf("Failed to find Revel version:", "error", err)
+	}
+
+	// Parse src but stop after processing the imports.
+	f, err := parser.ParseFile(fset, "", version, parser.ParseComments)
+	if err != nil {
+		utils.Logger.Errorf("Failed to parse Revel version error:", "error", err)
+	}
+
+	// Print the imports from the file's AST.
+	for _, s := range f.Decls {
+		genDecl, ok := s.(*ast.GenDecl)
+		if !ok {
+			continue
+		}
+		if genDecl.Tok != token.CONST {
+			continue
+		}
+		for _, a := range genDecl.Specs {
+			spec := a.(*ast.ValueSpec)
+			r := spec.Values[0].(*ast.BasicLit)
+			fmt.Printf("Revel %s = %s\n",spec.Names[0].Name,r.Value)
+		}
+	}
+
 	fmt.Printf("\n   %s %s/%s\n\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)
 }