feat: Add IngoreCase support

internal/cui-args/args_reader.go

@@ -14,8 +14,9 @@ import (
 // Panics and shows info if arguments are invalid
 func ProcessConsoleArguments() (*models.GrepConfigInternal, error) {
 	var args struct {
-		Pattern string `arg:"positional" help:"Regex for lines to match"`
-		Path    string `arg:"positional" default:".*" help:"extra RegEx for paths to match"`
+		Pattern    string `arg:"positional" help:"Regex for lines to match"`
+		Path       string `arg:"positional" default:".*" help:"extra RegEx for paths to match"`
+		IgnoreCase bool   `arg:"-i" help:"ignore case distinctions in patterns and data"`
 	}
 	arg.MustParse(&args)
 
@@ -31,6 +32,9 @@ func ProcessConsoleArguments() (*models.GrepConfigInternal, error) {
 		return nil, fmt.Errorf("unable to compile path pattern Regexp: %v", args.Path)
 	}
 
+	if args.IgnoreCase {
+		args.Pattern = "(?i)" + args.Pattern
+	}
 	res.TextPattern, err = regexp.Compile(args.Pattern)
 	if err != nil {
 		return nil, fmt.Errorf("unable to compile text pattern Regexp: %v", args.Pattern)