Added list command

aah/aah.go

@@ -113,5 +113,6 @@ func init() {
 		buildCmd,
 		versionCmd,
 		helpCmd,
+		listCmd,
 	}
 }

aah/list.go

@@ -0,0 +1,76 @@
+// Copyright (c) Jeevanandam M. (https://github.com/jeevatkm)
+// go-aah/tools source code and usage is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"aahframework.org/essentials.v0"
+)
+
+const aahProjectIdentifier = "aah.project"
+
+var (
+	listCmd = &command{
+		Name:      "list",
+		UsageLine: "aah list",
+		Short:     "List all aah projects in GOPATH",
+		Long: `aah's list command allows you to view all projects that are
+  making use of aah in your GOPATH`,
+		Run: listRun,
+	}
+)
+
+type aahProjectDirectories []string
+
+func (a aahProjectDirectories) String() string {
+
+	var formatted string
+
+	for _, v := range a {
+		formatted = fmt.Sprintf("%s \n %s", formatted, v)
+	}
+
+	return formatted
+}
+
+func listRun(args []string) {
+
+	projectsDir := aahProjectDirectories{}
+
+	ess.Walk(gopath, func(path string, info os.FileInfo, err error) error {
+
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() {
+			return nil
+		}
+
+		if isAahProject(path) {
+			projectsDir = append(projectsDir, filepath.Dir(path))
+		}
+
+		return nil
+	})
+
+	if count := len(projectsDir); count > 0 {
+		fmt.Printf("\n %d aah projects were found in your GOPATH \n", count)
+		fmt.Println(projectsDir)
+		return
+	}
+
+	fmt.Println(`No aah projects was found in your GOPATH..
+    \n You can create one with aah new`)
+
+}
+
+func isAahProject(file string) bool {
+	return strings.HasSuffix(file, aahProjectIdentifier)
+}