Adds list-categories command

.gitignore

@@ -1 +1,2 @@
 /bin/
+/bookworm.json

README.org

@@ -17,3 +17,6 @@ an ebook using calibre.
   script.
 - If possible, the script should send the ebook to our reader, if
   possible (say, through the kindle email, for example).
+- Allow to download the OPML and use it as a local storage for the
+  feeds. In the future, maybe users will send their OPMLs and Miniflux
+  will not be necessary.

cmd/bookworm/bookworm.go

@@ -5,15 +5,27 @@ import (
 	"flag"
 	"fmt"
 	"os"
+
+	miniflux "miniflux.app/client"
 )
 
 type Config struct {
 	MinifluxURL      string `json:"miniflux_url"`
+	MinifluxUsername string `json:"miniflux_username"`
+	MinifluxPassword string `json:"miniflux_password"`
 	MinifluxAPI      string `json:"miniflux_api"`
 	MinifluxCategory string `json:"miniflux_category"`
 }
 
 func (c *Config) IsValid() error {
+	if c.MinifluxURL == "" {
+		return fmt.Errorf("miniflux_url is required")
+	}
+
+	if c.MinifluxAPI == "" && (c.MinifluxUsername == "" || c.MinifluxPassword == "") {
+		return fmt.Errorf("either miniflux_api or miniflux_username and miniflux_password need to be set")
+	}
+
 	return nil
 }
 
@@ -31,6 +43,21 @@ func ReadConfig(name string) (*Config, error) {
 	return &cfg, nil
 }
 
+func createClient(cfg *Config) (*miniflux.Client, error) {
+	var client *miniflux.Client
+	if cfg.MinifluxAPI != "" {
+		client = miniflux.New(cfg.MinifluxURL, cfg.MinifluxAPI)
+	} else {
+		client = miniflux.New(cfg.MinifluxURL, cfg.MinifluxUsername, cfg.MinifluxPassword)
+	}
+
+	if _, err := client.Me(); err != nil {
+		return nil, fmt.Errorf("cannot get \"me\" with newly created client: %w", err)
+	}
+
+	return client, nil
+}
+
 func checkErr(err error) {
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "error: %s\n", err)
@@ -38,8 +65,25 @@ func checkErr(err error) {
 	}
 }
 
+func listCategories(cfg *Config, client *miniflux.Client) error {
+	categories, err := client.Categories()
+	if err != nil {
+		return fmt.Errorf("cannot fetch categories: %w", err)
+	}
+
+	if len(categories) != 0 {
+		fmt.Println("Category list")
+	}
+	for _, c := range categories {
+		fmt.Printf("- %s\n", c.Title)
+	}
+
+	return nil
+}
+
 func main() {
 	cfgFlag := flag.String("config", "bookworm.json", "path to the configuration file")
+	listCategoriesFlag := flag.Bool("list-categories", false, "lists the categories of the remote Miniflux instance")
 	flag.Parse()
 
 	cfg, err := ReadConfig(*cfgFlag)
@@ -47,4 +91,13 @@ func main() {
 
 	cErr := cfg.IsValid()
 	checkErr(cErr)
+
+	client, cliErr := createClient(cfg)
+	checkErr(cliErr)
+
+	if *listCategoriesFlag {
+		listCategories(cfg, client)
+	}
+
+	// download feeds (filter by category if specified)
 }

go.mod

@@ -1,3 +1,5 @@
 module git.ctrlz.es/mgdelacroix/bookworm
 
 go 1.21.9
+
+require miniflux.app v1.0.46

go.sum

@@ -0,0 +1,2 @@
+miniflux.app v1.0.46 h1:2/xrbXiEoQlj/bAZ8MT+fPN1+gmYDYuXVCOhvSskns4=
+miniflux.app v1.0.46/go.mod h1:YtEJIO1vMCvZgyzDbds7II0W/H7sGpo3auFCQscuMrE=