can now parse -ll or --list-languages

go-app/internal/cli/cli.go

@@ -3,7 +3,7 @@ package cli
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"github.com/rs/zerolog/log"
 	"os"
 	"path/filepath"
 	"pdfminion/internal/domain"
@@ -38,6 +38,9 @@ func ParseOptions() (*domain.MinionConfig, error) {
 	flag.BoolVar(&opts.Version, "version", false, domain.Flags["version"].Help)
 	flag.BoolVar(&opts.Version, "v", false, "")
 
+	flag.BoolVar(&opts.ListLanguages, "list-languages", false, domain.Flags["list-languages"].Help)
+	flag.BoolVar(&opts.ListLanguages, "ll", false, "")
+
 	flag.Usage = printHelp
 	flag.Parse()
 
@@ -52,8 +55,13 @@ func ParseOptions() (*domain.MinionConfig, error) {
 		os.Exit(0)
 	}
 
+	if opts.ListLanguages {
+		log.Info().Msg("List available languages")
+		domain.PrintLanguages()
+		os.Exit(0)
+	}
 	// Only validate directories if we're actually going to process files
-	if err := opts.validate(); err != nil {
+	if err := opts.Validate(); err != nil {
 		return nil, err
 	}
 
@@ -135,42 +143,3 @@ func getDaySuffix(day string) string {
 		return "th"
 	}
 }
-
-func (o *domain.MinionConfig) validate() error {
-	if err := o.validateSourceDir(); err != nil {
-		return err
-	}
-	return o.validateTargetDir()
-}
-
-func (o *domain.MinionConfig) validateSourceDir() error {
-	if _, err := os.Stat(o.SourceDir); os.IsNotExist(err) {
-		return fmt.Errorf("source directory %q does not exist", o.SourceDir)
-	}
-	return nil
-}
-
-func (o *domain.MinionConfig) validateTargetDir() error {
-	if _, err := os.Stat(o.TargetDir); os.IsNotExist(err) {
-		fmt.Printf("Target directory '%s' does not exist. Creating it...\n", o.TargetDir)
-		if err := os.MkdirAll(o.TargetDir, os.ModePerm); err != nil {
-			return fmt.Errorf("Failed to create directory '%s': %v", o.TargetDir, err)
-		}
-		return nil
-	}
-
-	if o.Force {
-		return nil
-	}
-
-	files, err := ioutil.ReadDir(o.TargetDir)
-	if err != nil {
-		return fmt.Errorf("Cannot read directory '%s': %v", o.TargetDir, err)
-	}
-
-	if len(files) > 0 {
-		return fmt.Errorf("Target directory '%s' is not empty. Use --force to override", o.TargetDir)
-	}
-
-	return nil
-}

go-app/internal/domain/language.go

@@ -1,6 +1,7 @@
 package domain
 
 import (
+	"fmt"
 	"golang.org/x/text/language"
 	"golang.org/x/text/language/display"
 	"os"
@@ -48,3 +49,33 @@ func ValidateLanguage(lang string) (language.Tag, error) {
 	tag, _, _ = matcher.Match(tag)
 	return tag, nil
 }
+
+func ListAvailableLanguages() [][]string {
+	languages := [][]string{}
+	for _, tag := range supportedLanguages {
+		// Get language code (two-letter code)
+		langCode := tag.String()
+
+		// Get language name in the language itself
+		nameInLanguage := GetLanguageName(tag)
+
+		// Get language name in English
+		nameInEnglish := GetLanguageNameInEnglish(tag)
+
+		languages = append(languages, []string{
+			langCode,       // Language code
+			nameInLanguage, // Name in native language
+			nameInEnglish,  // Name in English
+		})
+	}
+	return languages
+}
+
+func PrintLanguages() {
+	languages := ListAvailableLanguages()
+	for _, lang := range languages {
+		// Each `lang` is a []string with the format [langCode, nameInLanguage, nameInEnglish]
+		fmt.Printf("Code: %s, Native: %s, English: %s\n", lang[0], lang[1], lang[2])
+	}
+
+}

go-app/internal/domain/minionTypes.go

@@ -1,7 +1,10 @@
 package domain
 
 import (
+	"fmt"
 	"golang.org/x/text/language"
+	"io/ioutil"
+	"os"
 )
 
 // MinionConfig holds configuration items
@@ -155,3 +158,44 @@ var AppVersion string
 func SetAppVersion(version string) {
 	AppVersion = version
 }
+
+func (conf *MinionConfig) Validate() error {
+	if err := conf.validateSourceDir(); err != nil {
+		return err
+	}
+	return conf.validateTargetDir()
+}
+
+func (conf *MinionConfig) validateSourceDir() error {
+	if _, err := os.Stat(conf.SourceDir); os.IsNotExist(err) {
+		return fmt.Errorf("source directory %q does not exist", conf.SourceDir)
+	}
+	return nil
+}
+
+func (conf *MinionConfig) validateTargetDir() error {
+	if _, err := os.Stat(conf.TargetDir); os.IsNotExist(err) {
+		fmt.Printf("Target directory '%s' does not exist. Creating it...\n", conf.TargetDir)
+		if err := os.MkdirAll(conf.TargetDir, os.ModePerm); err != nil {
+			return fmt.Errorf("Failed to create directory '%s': %v", conf.TargetDir, err)
+		}
+		return nil
+	}
+
+	if conf.Force {
+		return nil
+	}
+
+	// TODO: replace deprecated ReadDir() with suggested replacement
+	files, err := ioutil.ReadDir(conf.TargetDir)
+
+	if err != nil {
+		return fmt.Errorf("Cannot read directory '%s': %v", conf.TargetDir, err)
+	}
+
+	if len(files) > 0 {
+		return fmt.Errorf("Target directory '%s' is not empty. Use --force to override", conf.TargetDir)
+	}
+
+	return nil
+}