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// SPDX-FileCopyrightText: 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: GPL-3.0-or-later
package cursor
import (
"bufio"
"bytes"
"errors"
"os"
"os/user"
"path/filepath"
"strings"
)
func LoadImage(theme, name string, size int) (*Image, error) {
f := scanTheme(theme, name, 0)
if f == nil {
f = scanTheme("default", name, 0)
}
if f == nil {
return nil, errors.New("not found image file")
}
return loadImageFromFile(f, size)
}
func LoadImages(theme, name string, size int) (Images, error) {
f := scanTheme(theme, name, 0)
if f == nil {
f = scanTheme("default", name, 0)
}
if f == nil {
return nil, errors.New("not found image file")
}
return loadImagesFromFile(f, size)
}
func getLibraryPaths() []string {
xcursorPath, ok := os.LookupEnv("XCURSOR_PATH")
if ok {
return strings.Split(xcursorPath, ":")
}
var paths []string
home := getHome()
// add ~/.icons
if home != "" {
paths = append(paths, filepath.Join(home, ".icons"))
}
paths = append(paths, "/usr/share/icons", "/usr/share/pixmaps")
return paths
}
func getHome() string {
home, ok := os.LookupEnv("HOME")
if ok {
return home
}
u, err := user.Current()
if err != nil {
return ""
}
return u.HomeDir
}
func scanTheme(theme, name string, depth int) *os.File {
if depth > 50 {
return nil
}
libPaths := getLibraryPaths()
var inherits []string
loop:
for _, libPath := range libPaths {
imgFile := filepath.Join(libPath, theme, "cursors", name)
f, err := os.Open(imgFile)
if err == nil {
return f
}
for _, base := range []string{"cursor.theme", "index.theme"} {
themeFile := filepath.Join(libPath, theme, base)
inherits, _ = getThemeInherits(themeFile)
if len(inherits) > 0 {
break loop
}
}
}
for _, i := range inherits {
if i == theme {
continue
}
f := scanTheme(i, name, depth+1)
if f != nil {
return f
}
}
// not found
return nil
}
func getThemeInherits(themeFile string) ([]string, error) {
f, err := os.Open(themeFile)
if err != nil {
return nil, err
}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
fields := bytes.SplitN(scanner.Bytes(), []byte("="), 2)
if len(fields) != 2 {
continue
}
if "Inherits" == string(bytes.TrimSpace(fields[0])) {
result := strings.Split(string(bytes.TrimSpace(fields[1])), ":")
return result, nil
}
}
if scanner.Err() != nil {
return nil, scanner.Err()
}
return nil, nil
}
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