add line number support and support for text files

cmd/config.go

@@ -17,7 +17,17 @@ import (
 
 const (
 	Version string = `v0.0.2`
-	Usage   string = `epuppy [-vd] <epub file>`
+	Usage   string = `Usage epuppy [options] <epub file>
+
+Options:
+-D --dark                enable dark mode
+-s --store-progress      store and use previous (experimental)
+-n --line-numbers        add line numbers
+-c --config <file>       use config <file>
+-d --debug               enable debugging
+-h --help                show help message
+-v --version             show program version
+`
 )
 
 type Config struct {
@@ -25,6 +35,7 @@ type Config struct {
 	Debug         bool         `koanf:"debug"`          // -d
 	StoreProgress bool         `koanf:"store-progress"` // -s
 	Darkmode      bool         `koanf:"dark"`           // -D
+	LineNumbers   bool         `koanf:"line-numbers"`   // -n
 	Config        string       `koanf:"config"`         // -c
 	ColorDark     ColorSetting `koanf:"colordark"`      // comes from config file only
 	ColorLight    ColorSetting `koanf:"colorlight"`     // comes from config file only
@@ -52,6 +63,7 @@ func InitConfig(output io.Writer) (*Config, error) {
 	flagset.BoolP("debug", "d", false, "enable debugging")
 	flagset.BoolP("dark", "D", false, "enable dark mode")
 	flagset.BoolP("store-progress", "s", false, "store reading progress")
+	flagset.BoolP("line-numbers", "n", false, "add line numbers")
 	flagset.StringP("config", "c", "", "read config from file")
 
 	if err := flagset.Parse(os.Args[1:]); err != nil {