Working on #266: Ability to add nested commands

* Modified `cobra add` command to be able to parse argument into nested command structure
* Modified `createCmdFile` function to accept cmdPath
* Modified cmdFile template to specify package name and to TitleCase
  command names so that they can be accessed by child packages.
* Simplified `writeTemplateToFile` function so that just the file path
  is passed instead of base path and filename.

cobra/cmd/add.go

@@ -14,6 +14,7 @@
 package cmd
 
 import (
+	"path"
 	"fmt"
 	"path/filepath"
 	"strings"
@@ -48,7 +49,25 @@ Example: cobra add server  -> resulting in a new cmd/server.go
 			er("add needs a name for the command")
 		}
 		guessProjectPath()
-		createCmdFile(args[0])
+
+		// Iterate over command parts delimited by "/".
+		currentPath := ""
+		cmdParts := strings.Split(args[0], "/")
+		for n, cmd := range cmdParts {
+			//
+			if n > 0 {
+				// Set parent name to previous command's name.
+				pName = cmdParts[n-1]
+
+				//
+				currentPath += pName + "/"
+			}
+
+			// TODO Create command file if it does not already exist.
+			createCmdFile(cmd, currentPath)
+		}
+
+
 	},
 }
 
@@ -64,13 +83,13 @@ func parentName() string {
 	return pName
 }
 
-func createCmdFile(cmdName string) {
+func createCmdFile(cmdName, cmdPath string) {
 	lic := getLicense()
 
 	template := `{{ comment .copyright }}
 {{ comment .license }}
 
-package cmd
+package {{ .packageName }}
 
 import (
 	"fmt"
@@ -78,8 +97,8 @@ import (
 	"github.com/spf13/cobra"
 )
 
-// {{.cmdName}}Cmd represents the {{.cmdName}} command
-var {{ .cmdName }}Cmd = &cobra.Command{
+// {{ .cmdName | title }}Cmd represents the {{ .cmdName }} command
+{{ .cmdName | title }}Cmd := &cobra.Command{
 	Use:   "{{ .cmdName }}",
 	Short: "A brief description of your command",
 	Long: ` + "`" + `A longer description that spans multiple lines and likely contains examples
@@ -95,7 +114,7 @@ to quickly create a Cobra application.` + "`" + `,
 }
 
 func init() {
-	{{ .parentName }}.AddCommand({{ .cmdName }}Cmd)
+	{{ .parentName | title }}.AddCommand({{ .cmdName | title }}Cmd)
 
 	// Here you will define your flags and configuration settings.
 
@@ -110,8 +129,14 @@ func init() {
 }
 `
 
-	var data map[string]interface{}
-	data = make(map[string]interface{})
+	data := make(map[string]interface{})
+
+	data["packageName"] = "cmd"
+
+	//
+	if cmdPath != "" {
+		data["packageName"] = path.Base(cmdPath)
+	}
 
 	data["copyright"] = copyrightLine()
 	data["license"] = lic.Header
@@ -120,9 +145,10 @@ func init() {
 	data["parentName"] = parentName()
 	data["cmdName"] = cmdName
 
-	err := writeTemplateToFile(filepath.Join(ProjectPath(), guessCmdDir()), cmdName+".go", template, data)
-	if err != nil {
+	file := filepath.Join(ProjectPath(), guessCmdDir(), cmdPath, cmdName+".go")
+
+	if err := writeTemplateToFile(file, template, data); err != nil {
 		er(err)
 	}
-	fmt.Println(cmdName, "created at", filepath.Join(ProjectPath(), guessCmdDir(), cmdName+".go"))
+	fmt.Println(cmdName, "created at", file)
 }

cobra/cmd/helpers.go

@@ -224,21 +224,13 @@ func dirExists(path string) (bool, error) {
 	return false, err
 }
 
-func writeTemplateToFile(path string, file string, template string, data interface{}) error {
-	filename := filepath.Join(path, file)
-
+func writeTemplateToFile(file string, template string, data interface{}) error {
 	r, err := templateToReader(template, data)
-
 	if err != nil {
 		return err
 	}
 
-	err = safeWriteToDisk(filename, r)
-
-	if err != nil {
-		return err
-	}
-	return nil
+	return safeWriteToDisk(file, r)
 }
 
 func writeStringToFile(path, file, text string) error {
@@ -254,7 +246,7 @@ func writeStringToFile(path, file, text string) error {
 }
 
 func templateToReader(tpl string, data interface{}) (io.Reader, error) {
-	tmpl := template.New("")
+	tmpl := template.New("").Funcs(template.FuncMap{"title": strings.Title})
 	tmpl.Funcs(funcMap)
 	tmpl, err := tmpl.Parse(tpl)
 

cobra/cmd/init.go

@@ -104,7 +104,7 @@ func createLicenseFile() {
 		buf := new(bytes.Buffer)
 		buf.ReadFrom(r)
 
-		err := writeTemplateToFile(ProjectPath(), "LICENSE", buf.String(), data)
+		err := writeTemplateToFile(ProjectPath()+"LICENSE", buf.String(), data)
 		_ = err
 		// if err != nil {
 		// 	er(err)
@@ -139,7 +139,7 @@ func main() {
 
 	data["importpath"] = guessImportPath() + "/" + guessCmdDir()
 
-	err := writeTemplateToFile(ProjectPath(), "main.go", template, data)
+	err := writeTemplateToFile(ProjectPath()+"main.go", template, data)
 	_ = err
 	// if err != nil {
 	// 	er(err)
@@ -233,7 +233,7 @@ func initConfig() {
 
 	data["viper"] = viper.GetBool("useViper")
 
-	err := writeTemplateToFile(ProjectPath()+string(os.PathSeparator)+guessCmdDir(), "root.go", template, data)
+	err := writeTemplateToFile(ProjectPath()+string(os.PathSeparator)+guessCmdDir()+"root.go", template, data)
 	if err != nil {
 		er(err)
 	}