Refactor packages to have more idiomatic code base

ui/form/category.go

@@ -0,0 +1,38 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package form
+
+import (
+	"net/http"
+
+	"github.com/miniflux/miniflux/errors"
+	"github.com/miniflux/miniflux/model"
+)
+
+// CategoryForm represents a feed form in the UI
+type CategoryForm struct {
+	Title string
+}
+
+// Validate makes sure the form values are valid.
+func (c CategoryForm) Validate() error {
+	if c.Title == "" {
+		return errors.NewLocalizedError("The title is mandatory.")
+	}
+	return nil
+}
+
+// Merge update the given category fields.
+func (c CategoryForm) Merge(category *model.Category) *model.Category {
+	category.Title = c.Title
+	return category
+}
+
+// NewCategoryForm returns a new CategoryForm.
+func NewCategoryForm(r *http.Request) *CategoryForm {
+	return &CategoryForm{
+		Title: r.FormValue("title"),
+	}
+}