add delete command route for the api

cmd/api/command.go

@@ -73,4 +73,28 @@ func (app *application) createCommandHandler(w http.ResponseWriter, r *http.Requ
 	}
 }
 
+func (app *application) deleteCommandHandler(w http.ResponseWriter, r *http.Request) {
+	name, err := app.readCommandNameParam(r)
+	if err != nil {
+		app.notFoundResponse(w, r)
+		return
+	}
+
+	err = app.Models.Commands.Delete(name)
+	if err != nil {
+		switch {
+		case errors.Is(err, data.ErrRecordNotFound):
+			app.notFoundResponse(w, r)
+		default:
+			app.serverErrorResponse(w, r, err)
+		}
+		return
+	}
+
+	err = app.writeJSON(w, http.StatusOK, envelope{"message": fmt.Sprintf("command %s deleted", name)}, nil)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+	}
+}
+
 type envelope map[string]interface{}

cmd/api/errors.go

@@ -33,3 +33,8 @@ func (app *application) errorResponse(w http.ResponseWriter, r *http.Request, st
 func (app *application) badRequestResponse(w http.ResponseWriter, r *http.Request, err error) {
 	app.errorResponse(w, r, http.StatusBadRequest, err.Error())
 }
+
+func (app *application) notFoundResponse(w http.ResponseWriter, r *http.Request) {
+	message := "the requested resource could not be found"
+	app.errorResponse(w, r, http.StatusNotFound, message)
+}

cmd/api/routes.go

@@ -11,5 +11,6 @@ func (app *application) routes() *httprouter.Router {
 
 	router.HandlerFunc(http.MethodGet, "/v1/commands/:name", app.showCommandHandler)
 	router.HandlerFunc(http.MethodPost, "/v1/commands", app.createCommandHandler)
+	router.HandlerFunc(http.MethodDelete, "/v1/commands/:name", app.deleteCommandHandler)
 	return router
 }