Make Samefile interface a bit nicer for working with paths

tools/themes/collection.go

@@ -830,14 +830,9 @@ func (self *Themes) add_from_dir(dirpath string) error {
 	for _, e := range entries {
 		if !e.IsDir() && strings.HasSuffix(e.Name(), ".conf") {
 			path := filepath.Join(dirpath, e.Name())
-			// ignore files if they are the current processes, stdout
-			// allows using kitten theme --dump-theme > ~/.config/kitty/themes/name.conf
-			if st, err := os.Stat(path); err == nil {
-				if st2, err := os.Stdout.Stat(); err == nil && os.SameFile(st, st2) {
-					continue
-				}
-			}
-			if path == os.Stdout.Name() {
+			// ignore files if they are the STDOUT of the current processes
+			// allows using kitten theme --dump-theme name > ~/.config/kitty/themes/name.conf
+			if utils.Samefile(path, os.Stdout) {
 				continue
 			}
 			if _, err = self.AddFromFile(path); err != nil {

tools/utils/misc.go

@@ -4,6 +4,7 @@ package utils
 
 import (
 	"fmt"
+	"os"
 
 	"golang.org/x/exp/constraints"
 	"golang.org/x/exp/slices"
@@ -153,3 +154,50 @@ func Memset[T any](dest []T, pattern ...T) []T {
 	}
 	return dest
 }
+
+type statable interface {
+	Stat() (os.FileInfo, error)
+}
+
+func Samefile(a, b any) bool {
+	var sta, stb os.FileInfo
+	var err error
+	switch v := a.(type) {
+	case string:
+		sta, err = os.Stat(v)
+		if err != nil {
+			return false
+		}
+	case statable:
+		sta, err = v.Stat()
+		if err != nil {
+			return false
+		}
+	case *os.FileInfo:
+		sta = *v
+	case os.FileInfo:
+		sta = v
+	default:
+		panic(fmt.Sprintf("a must be a string, os.FileInfo or a stat-able object not %T", v))
+	}
+	switch v := b.(type) {
+	case string:
+		stb, err = os.Stat(v)
+		if err != nil {
+			return false
+		}
+	case statable:
+		stb, err = v.Stat()
+		if err != nil {
+			return false
+		}
+	case *os.FileInfo:
+		stb = *v
+	case os.FileInfo:
+		stb = v
+	default:
+		panic(fmt.Sprintf("b must be a string, os.FileInfo or a stat-able object not %T", v))
+	}
+
+	return os.SameFile(sta, stb)
+}