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// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
package notify
import (
"os"
"path/filepath"
"sort"
"strconv"
"strings"
)
// IconThemeName reads the desktop's current icon theme: qt6ct is the truth on
// this desktop, then the GTK3 setting, then hicolor. A missing or empty value
// falls through.
func IconThemeName() string {
if v := iniValue(filepath.Join(homeDir(), ".config", "qt6ct", "qt6ct.conf"), "icon_theme"); v != "" {
return v
}
if v := iniValue(filepath.Join(homeDir(), ".config", "gtk-3.0", "settings.ini"), "gtk-icon-theme-name"); v != "" {
return v
}
return "hicolor"
}
// ResolveIcon turns an app_icon or image-path value into a file path. A URI is
// trimmed, a path is returned unchanged, and a bare name is looked up in the
// icon theme. Nothing found is an empty string, which renders no image.
func ResolveIcon(value string) string {
if value == "" {
return ""
}
if strings.HasPrefix(value, "file://") {
return strings.TrimPrefix(value, "file://")
}
if strings.Contains(value, "/") {
return value
}
return lookupThemeIcon(value, IconThemeName())
}
// XDGIconDirs is the icon search path: the user's dir then each data dir.
func XDGIconDirs() []string {
home := os.Getenv("XDG_DATA_HOME")
if home == "" {
home = filepath.Join(homeDir(), ".local", "share")
}
dirs := []string{filepath.Join(home, "icons")}
for _, d := range filepath.SplitList(os.Getenv("XDG_DATA_DIRS")) {
if d != "" {
dirs = append(dirs, filepath.Join(d, "icons"))
}
}
if len(dirs) == 1 {
dirs = append(dirs, "/usr/local/share/icons", "/usr/share/icons")
}
return dirs
}
// lookupThemeIcon searches the theme, then its Inherits chain, then hicolor.
func lookupThemeIcon(name, theme string) string {
seen := map[string]bool{}
for theme != "" && !seen[theme] {
seen[theme] = true
found, next := "", ""
for _, root := range XDGIconDirs() {
base := filepath.Join(root, theme)
if p := findInTheme(base, name); p != "" {
found = p
break
}
if next == "" {
next = inheritsOf(base)
}
}
if found != "" {
return found
}
theme = next
}
for _, root := range XDGIconDirs() {
if p := findInTheme(filepath.Join(root, "hicolor"), name); p != "" {
return p
}
}
return ""
}
// findInTheme prefers scalable then the largest raster under apps/.
func findInTheme(base, name string) string {
sizes := []string{"scalable"}
matches, _ := filepath.Glob(filepath.Join(base, "apps", "[0-9]*"))
for _, m := range matches {
sizes = append(sizes, filepath.Base(m))
}
numeric := sizes[1:]
sort.Slice(numeric, func(i, j int) bool {
a, _ := strconv.Atoi(strings.TrimSuffix(numeric[i], "@2x"))
b, _ := strconv.Atoi(strings.TrimSuffix(numeric[j], "@2x"))
return a > b
})
for _, size := range sizes {
for _, ext := range []string{"svg", "png", "xpm"} {
p := filepath.Join(base, "apps", size, name+"."+ext)
if fileExists(p) {
return p
}
}
}
return ""
}
func inheritsOf(base string) string {
v := iniValue(filepath.Join(base, "index.theme"), "Inherits")
if i := strings.IndexByte(v, ','); i >= 0 {
v = v[:i]
}
return strings.TrimSpace(v)
}
func iniValue(path, key string) string {
data, err := os.ReadFile(path)
if err != nil {
return ""
}
for _, line := range strings.Split(string(data), "\n") {
line = strings.TrimSpace(line)
if strings.HasPrefix(line, "#") || !strings.Contains(line, "=") {
continue
}
k, v, _ := strings.Cut(line, "=")
if strings.TrimSpace(k) == key {
return strings.TrimSpace(v)
}
}
return ""
}
func homeDir() string {
if h := os.Getenv("HOME"); h != "" {
return h
}
return os.TempDir()
}
func fileExists(path string) bool {
info, err := os.Stat(path)
return err == nil && !info.IsDir()
}
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