Move the kittens Go code into the kittens folder

kittens/ssh/data.go

@@ -0,0 +1,69 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package ssh
+
+import (
+	"archive/tar"
+	_ "embed"
+	"errors"
+	"fmt"
+	"io"
+	"kitty/tools/utils"
+	"regexp"
+	"strings"
+)
+
+var _ = fmt.Print
+
+//go:embed data_generated.bin
+var embedded_data string
+
+type Entry struct {
+	metadata *tar.Header
+	data     []byte
+}
+
+type Container map[string]Entry
+
+var Data = (&utils.Once[Container]{Run: func() Container {
+	tr := tar.NewReader(utils.ReaderForCompressedEmbeddedData(embedded_data))
+	ans := make(Container, 64)
+	for {
+		hdr, err := tr.Next()
+		if errors.Is(err, io.EOF) {
+			break
+		}
+		if err != nil {
+			panic(err)
+		}
+		data, err := utils.ReadAll(tr, int(hdr.Size))
+		if err != nil {
+			panic(err)
+		}
+		ans[hdr.Name] = Entry{hdr, data}
+	}
+	return ans
+}}).Get
+
+func (self Container) files_matching(prefix string, exclude_patterns ...string) []string {
+	ans := make([]string, 0, len(self))
+	patterns := make([]*regexp.Regexp, len(exclude_patterns))
+	for i, exp := range exclude_patterns {
+		patterns[i] = regexp.MustCompile(exp)
+	}
+	for name := range self {
+		if strings.HasPrefix(name, prefix) {
+			excluded := false
+			for _, pat := range patterns {
+				if matched := pat.FindString(name); matched != "" {
+					excluded = true
+					break
+				}
+			}
+			if !excluded {
+				ans = append(ans, name)
+			}
+		}
+	}
+	return ans
+}