Improve OPML package to be more idiomatic

reader/opml/handler.go

@@ -7,21 +7,24 @@ package opml
 import (
 	"errors"
 	"fmt"
-	"github.com/miniflux/miniflux2/model"
-	"github.com/miniflux/miniflux2/storage"
 	"io"
 	"log"
+
+	"github.com/miniflux/miniflux2/model"
+	"github.com/miniflux/miniflux2/storage"
 )
 
-type OpmlHandler struct {
+// Handler handles the logic for OPML import/export.
+type Handler struct {
 	store *storage.Storage
 }
 
-func (o *OpmlHandler) Export(userID int64) (string, error) {
-	feeds, err := o.store.GetFeeds(userID)
+// Export exports user feeds to OPML.
+func (h *Handler) Export(userID int64) (string, error) {
+	feeds, err := h.store.GetFeeds(userID)
 	if err != nil {
 		log.Println(err)
-		return "", errors.New("Unable to fetch feeds.")
+		return "", errors.New("unable to fetch feeds")
 	}
 
 	var subscriptions SubcriptionList
@@ -37,27 +40,28 @@ func (o *OpmlHandler) Export(userID int64) (string, error) {
 	return Serialize(subscriptions), nil
 }
 
-func (o *OpmlHandler) Import(userID int64, data io.Reader) (err error) {
+// Import parses and create feeds from an OPML import.
+func (h *Handler) Import(userID int64, data io.Reader) (err error) {
 	subscriptions, err := Parse(data)
 	if err != nil {
 		return err
 	}
 
 	for _, subscription := range subscriptions {
-		if !o.store.FeedURLExists(userID, subscription.FeedURL) {
+		if !h.store.FeedURLExists(userID, subscription.FeedURL) {
 			var category *model.Category
 
 			if subscription.CategoryName == "" {
-				category, err = o.store.GetFirstCategory(userID)
+				category, err = h.store.GetFirstCategory(userID)
 				if err != nil {
 					log.Println(err)
-					return errors.New("Unable to find first category.")
+					return errors.New("unable to find first category")
 				}
 			} else {
-				category, err = o.store.GetCategoryByTitle(userID, subscription.CategoryName)
+				category, err = h.store.GetCategoryByTitle(userID, subscription.CategoryName)
 				if err != nil {
 					log.Println(err)
-					return errors.New("Unable to search category by title.")
+					return errors.New("unable to search category by title")
 				}
 
 				if category == nil {
@@ -66,10 +70,10 @@ func (o *OpmlHandler) Import(userID int64, data io.Reader) (err error) {
 						Title:  subscription.CategoryName,
 					}
 
-					err := o.store.CreateCategory(category)
+					err := h.store.CreateCategory(category)
 					if err != nil {
 						log.Println(err)
-						return fmt.Errorf(`Unable to create this category: "%s".`, subscription.CategoryName)
+						return fmt.Errorf(`unable to create this category: "%s"`, subscription.CategoryName)
 					}
 				}
 			}
@@ -82,13 +86,14 @@ func (o *OpmlHandler) Import(userID int64, data io.Reader) (err error) {
 				Category: category,
 			}
 
-			o.store.CreateFeed(feed)
+			h.store.CreateFeed(feed)
 		}
 	}
 
 	return nil
 }
 
-func NewOpmlHandler(store *storage.Storage) *OpmlHandler {
-	return &OpmlHandler{store: store}
+// NewHandler creates a new handler for OPML files.
+func NewHandler(store *storage.Storage) *Handler {
+	return &Handler{store: store}
 }

reader/opml/opml.go

@@ -6,21 +6,21 @@ package opml
 
 import "encoding/xml"
 
-type Opml struct {
+type opml struct {
 	XMLName  xml.Name  `xml:"opml"`
 	Version  string    `xml:"version,attr"`
-	Outlines []Outline `xml:"body>outline"`
+	Outlines []outline `xml:"body>outline"`
 }
 
-type Outline struct {
+type outline struct {
 	Title    string    `xml:"title,attr,omitempty"`
 	Text     string    `xml:"text,attr"`
 	FeedURL  string    `xml:"xmlUrl,attr,omitempty"`
 	SiteURL  string    `xml:"htmlUrl,attr,omitempty"`
-	Outlines []Outline `xml:"outline,omitempty"`
+	Outlines []outline `xml:"outline,omitempty"`
 }
 
-func (o *Outline) GetTitle() string {
+func (o *outline) GetTitle() string {
 	if o.Title != "" {
 		return o.Title
 	}
@@ -40,7 +40,7 @@ func (o *Outline) GetTitle() string {
 	return ""
 }
 
-func (o *Outline) GetSiteURL() string {
+func (o *outline) GetSiteURL() string {
 	if o.SiteURL != "" {
 		return o.SiteURL
 	}
@@ -48,11 +48,11 @@ func (o *Outline) GetSiteURL() string {
 	return o.FeedURL
 }
 
-func (o *Outline) IsCategory() bool {
+func (o *outline) IsCategory() bool {
 	return o.Text != "" && o.SiteURL == "" && o.FeedURL == ""
 }
 
-func (o *Outline) Append(subscriptions SubcriptionList, category string) SubcriptionList {
+func (o *outline) Append(subscriptions SubcriptionList, category string) SubcriptionList {
 	if o.FeedURL != "" {
 		subscriptions = append(subscriptions, &Subcription{
 			Title:        o.GetTitle(),
@@ -65,7 +65,7 @@ func (o *Outline) Append(subscriptions SubcriptionList, category string) Subcrip
 	return subscriptions
 }
 
-func (o *Opml) Transform() SubcriptionList {
+func (o *opml) Transform() SubcriptionList {
 	var subscriptions SubcriptionList
 
 	for _, outline := range o.Outlines {

reader/opml/parser.go

@@ -14,14 +14,14 @@ import (
 
 // Parse reads an OPML file and returns a SubcriptionList.
 func Parse(data io.Reader) (SubcriptionList, error) {
-	opml := new(Opml)
+	feeds := new(opml)
 	decoder := xml.NewDecoder(data)
 	decoder.CharsetReader = charset.NewReaderLabel
 
-	err := decoder.Decode(opml)
+	err := decoder.Decode(feeds)
 	if err != nil {
 		return nil, errors.NewLocalizedError("Unable to parse OPML file: %v.", err)
 	}
 
-	return opml.Transform(), nil
+	return feeds.Transform(), nil
 }

reader/opml/serializer.go

@@ -17,13 +17,13 @@ func Serialize(subscriptions SubcriptionList) string {
 	writer := bufio.NewWriter(&b)
 	writer.WriteString(xml.Header)
 
-	opml := new(Opml)
-	opml.Version = "2.0"
+	feeds := new(opml)
+	feeds.Version = "2.0"
 	for categoryName, subs := range groupSubscriptionsByFeed(subscriptions) {
-		outline := Outline{Text: categoryName}
+		category := outline{Text: categoryName}
 
 		for _, subscription := range subs {
-			outline.Outlines = append(outline.Outlines, Outline{
+			category.Outlines = append(category.Outlines, outline{
 				Title:   subscription.Title,
 				Text:    subscription.Title,
 				FeedURL: subscription.FeedURL,
@@ -31,12 +31,12 @@ func Serialize(subscriptions SubcriptionList) string {
 			})
 		}
 
-		opml.Outlines = append(opml.Outlines, outline)
+		feeds.Outlines = append(feeds.Outlines, category)
 	}
 
 	encoder := xml.NewEncoder(writer)
 	encoder.Indent("    ", "    ")
-	if err := encoder.Encode(opml); err != nil {
+	if err := encoder.Encode(feeds); err != nil {
 		log.Println(err)
 		return ""
 	}

reader/opml/subscription.go

@@ -4,6 +4,7 @@
 
 package opml
 
+// Subcription represents a feed that will be imported or exported.
 type Subcription struct {
 	Title        string
 	SiteURL      string
@@ -11,8 +12,11 @@ type Subcription struct {
 	CategoryName string
 }
 
+// Equals compare two subscriptions.
 func (s Subcription) Equals(subscription *Subcription) bool {
-	return s.Title == subscription.Title && s.SiteURL == subscription.SiteURL && s.FeedURL == subscription.FeedURL && s.CategoryName == subscription.CategoryName
+	return s.Title == subscription.Title && s.SiteURL == subscription.SiteURL &&
+		s.FeedURL == subscription.FeedURL && s.CategoryName == subscription.CategoryName
 }
 
+// SubcriptionList is a list of subscriptions.
 type SubcriptionList []*Subcription

server/routes.go

@@ -5,6 +5,8 @@
 package server
 
 import (
+	"net/http"
+
 	"github.com/miniflux/miniflux2/locale"
 	"github.com/miniflux/miniflux2/reader/feed"
 	"github.com/miniflux/miniflux2/reader/opml"
@@ -14,7 +16,6 @@ import (
 	"github.com/miniflux/miniflux2/server/template"
 	ui_controller "github.com/miniflux/miniflux2/server/ui/controller"
 	"github.com/miniflux/miniflux2/storage"
-	"net/http"
 
 	"github.com/gorilla/mux"
 )
@@ -25,7 +26,7 @@ func getRoutes(store *storage.Storage, feedHandler *feed.Handler) *mux.Router {
 	templateEngine := template.NewTemplateEngine(router, translator)
 
 	apiController := api_controller.NewController(store, feedHandler)
-	uiController := ui_controller.NewController(store, feedHandler, opml.NewOpmlHandler(store))
+	uiController := ui_controller.NewController(store, feedHandler, opml.NewHandler(store))
 
 	apiHandler := core.NewHandler(store, router, templateEngine, translator, middleware.NewMiddlewareChain(
 		middleware.NewBasicAuthMiddleware(store).Handler,

server/ui/controller/controller.go

@@ -25,7 +25,7 @@ func (t tplParams) Merge(d tplParams) tplParams {
 type Controller struct {
 	store       *storage.Storage
 	feedHandler *feed.Handler
-	opmlHandler *opml.OpmlHandler
+	opmlHandler *opml.Handler
 }
 
 func (c *Controller) getCommonTemplateArgs(ctx *core.Context) (tplParams, error) {
@@ -47,7 +47,7 @@ func (c *Controller) getCommonTemplateArgs(ctx *core.Context) (tplParams, error)
 	return params, nil
 }
 
-func NewController(store *storage.Storage, feedHandler *feed.Handler, opmlHandler *opml.OpmlHandler) *Controller {
+func NewController(store *storage.Storage, feedHandler *feed.Handler, opmlHandler *opml.Handler) *Controller {
 	return &Controller{
 		store:       store,
 		feedHandler: feedHandler,