Replace utils.Once with stdlib sync.OnceValue

kittens/diff/highlight.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 
 	"kitty/tools/utils"
 	"kitty/tools/utils/images"
@@ -22,7 +23,7 @@ var _ = fmt.Print
 var _ = os.WriteFile
 
 var ErrNoLexer = errors.New("No lexer available for this format")
-var DefaultStyle = utils.Once(func() *chroma.Style {
+var DefaultStyle = sync.OnceValue(func() *chroma.Style {
 	// Default style generated by python style.py default pygments.styles.default.DefaultStyle
 	// with https://raw.githubusercontent.com/alecthomas/chroma/master/_tools/style.py
 	return styles.Register(chroma.MustNewStyle("default", chroma.StyleEntries{

kittens/diff/mouse.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
 
 	"kitty"
 	"kitty/tools/config"
@@ -43,7 +44,7 @@ func read_relevant_kitty_opts(path string) KittyOpts {
 	return ans
 }
 
-var RelevantKittyOpts = utils.Once(func() KittyOpts {
+var RelevantKittyOpts = sync.OnceValue(func() KittyOpts {
 	return read_relevant_kitty_opts(filepath.Join(utils.ConfigDir(), "kitty.conf"))
 })
 

kittens/diff/patch.go

@@ -13,6 +13,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
 )
 
 var _ = fmt.Print
@@ -22,11 +23,11 @@ const DIFF_DIFF = `diff -p -U _CONTEXT_ --`
 
 var diff_cmd []string
 
-var GitExe = utils.Once(func() string {
+var GitExe = sync.OnceValue(func() string {
 	return utils.FindExe("git")
 })
 
-var DiffExe = utils.Once(func() string {
+var DiffExe = sync.OnceValue(func() string {
 	return utils.FindExe("diff")
 })