Port the hyperlinked_grep kitten to Go

tools/cmd/hyperlinked_grep/main_test.go

@@ -0,0 +1,67 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package hyperlinked_grep
+
+import (
+	"fmt"
+	"testing"
+)
+
+var _ = fmt.Print
+
+func TestRgArgParsing(t *testing.T) {
+	if RgExe() == "rg" {
+		t.Skip("Skipping as rg not found in PATH")
+	}
+
+	check_failure := func(args ...string) {
+		_, _, _, err := parse_args(args...)
+		if err == nil {
+			t.Fatalf("No error when parsing: %#v", args)
+		}
+	}
+	check_failure("--kitten", "xyz")
+	check_failure("--kitten", "xyz=1")
+
+	check_kitten_opts := func(matching, context, headers bool, args ...string) {
+		_, _, kitten_opts, err := parse_args(args...)
+		if err != nil {
+			t.Fatalf("error when parsing: %#v: %s", args, err)
+		}
+		if matching != kitten_opts.matching_lines {
+			t.Fatalf("Matching lines not correct for: %#v", args)
+		}
+		if context != kitten_opts.context_lines {
+			t.Fatalf("Context lines not correct for: %#v", args)
+		}
+		if headers != kitten_opts.file_headers {
+			t.Fatalf("File headers not correct for: %#v", args)
+		}
+	}
+	check_kitten_opts(true, true, true)
+	check_kitten_opts(false, false, false, "--kitten", "hyperlink=none")
+	check_kitten_opts(false, false, true, "--kitten", "hyperlink=none", "--count", "--kitten=hyperlink=file_headers")
+	check_kitten_opts(false, false, true, "--kitten", "hyperlink=none,file_headers")
+
+	check_kitten_opts = func(with_filename, heading, line_number bool, args ...string) {
+		_, _, kitten_opts, err := parse_args(args...)
+		if err != nil {
+			t.Fatalf("error when parsing: %#v: %s", args, err)
+		}
+		if with_filename != kitten_opts.with_filename {
+			t.Fatalf("with_filename not correct for: %#v", args)
+		}
+		if heading != kitten_opts.heading {
+			t.Fatalf("heading not correct for: %#v", args)
+		}
+		if line_number != kitten_opts.line_number {
+			t.Fatalf("line_number not correct for: %#v", args)
+		}
+	}
+
+	check_kitten_opts(true, true, true)
+	check_kitten_opts(true, false, true, "--no-heading")
+	check_kitten_opts(true, true, true, "--no-heading", "--pretty")
+	check_kitten_opts(true, true, true, "--no-heading", "--heading")
+
+}