app picker: extend App Picker to integrate with mime overrides

- Adds "DMS Opener" as an option (dms-open.desktop) - Add mime type GO utils - Add rememberance to App Picker modal
2026-05-15 00:32:47 -04:00 · 2026-05-14 13:06:22 -04:00
parent be4ea71756
commit 018795125e
15 changed files with 1467 additions and 427 deletions
@@ -28,9 +28,9 @@ with flags to handle different MIME types or application categories.

 Examples:
  dms open https://example.com                    # Open URL with browser picker
-  dms open file.pdf --mime application/pdf        # Open PDF with compatible apps
-  dms open document.odt --category Office         # Open with office applications
-  dms open --mime image/png image.png             # Open image with image viewers`,
+  dms open file.pdf                               # Open file (MIME auto-detected)
+  dms open file.pdf --mime application/pdf        # Override MIME detection
+  dms open document.odt --category Office         # Open with office applications`,
 	Args: cobra.ExactArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
 		runOpen(args[0])
@@ -47,123 +47,58 @@ func init() {
 	})
 }

-// mimeTypeToCategories maps MIME types to desktop file categories
-func mimeTypeToCategories(mimeType string) []string {
-	// Split MIME type to get the main type
-	parts := strings.Split(mimeType, "/")
-	if len(parts) < 1 {
-		return nil
+func detectMimeFromPath(path string) string {
+	ext := filepath.Ext(path)
+	if ext == "" {
+		return ""
 	}
-
-	mainType := parts[0]
-
-	switch mainType {
-	case "image":
-		return []string{"Graphics", "Viewer"}
-	case "video":
-		return []string{"Video", "AudioVideo"}
-	case "audio":
-		return []string{"Audio", "AudioVideo"}
-	case "text":
-		if strings.Contains(mimeType, "html") {
-			return []string{"WebBrowser"}
-		}
-		return []string{"TextEditor", "Office"}
-	case "application":
-		if strings.Contains(mimeType, "pdf") {
-			return []string{"Office", "Viewer"}
-		}
-		if strings.Contains(mimeType, "document") || strings.Contains(mimeType, "spreadsheet") ||
-			strings.Contains(mimeType, "presentation") || strings.Contains(mimeType, "msword") ||
-			strings.Contains(mimeType, "ms-excel") || strings.Contains(mimeType, "ms-powerpoint") ||
-			strings.Contains(mimeType, "opendocument") {
-			return []string{"Office"}
-		}
-		if strings.Contains(mimeType, "zip") || strings.Contains(mimeType, "tar") ||
-			strings.Contains(mimeType, "gzip") || strings.Contains(mimeType, "compress") {
-			return []string{"Archiving", "Utility"}
-		}
-		return []string{"Office", "Viewer"}
-	}
-
-	return nil
+	return mime.TypeByExtension(ext)
 }

 func runOpen(target string) {
-	// Parse file:// URIs to extract the actual file path
 	actualTarget := target
 	detectedMimeType := openMimeType
-	detectedCategories := openCategories
 	detectedRequestType := openRequestType

 	log.Infof("Processing target: %s", target)

-	if parsedURL, err := url.Parse(target); err == nil && parsedURL.Scheme == "file" {
-		// Extract file path from file:// URI and convert to absolute path
-		actualTarget = parsedURL.Path
-		if absPath, err := filepath.Abs(actualTarget); err == nil {
-			actualTarget = absPath
+	switch {
+	case isScheme(target, "file://"):
+		parsedURL, err := url.Parse(target)
+		if err == nil {
+			actualTarget = parsedURL.Path
+		}
+		if abs, err := filepath.Abs(actualTarget); err == nil {
+			actualTarget = abs
 		}
-
 		if detectedRequestType == "url" || detectedRequestType == "" {
 			detectedRequestType = "file"
 		}
-
-		log.Infof("Detected file:// URI, extracted absolute path: %s", actualTarget)
-
-		// Auto-detect MIME type if not provided
 		if detectedMimeType == "" {
-			ext := filepath.Ext(actualTarget)
-			if ext != "" {
-				detectedMimeType = mime.TypeByExtension(ext)
-				log.Infof("Detected MIME type from extension %s: %s", ext, detectedMimeType)
-			}
+			detectedMimeType = detectMimeFromPath(actualTarget)
 		}
+		log.Infof("Detected file:// URI, absolute path: %s", actualTarget)

-		// Auto-detect categories based on MIME type if not provided
-		if len(detectedCategories) == 0 && detectedMimeType != "" {
-			detectedCategories = mimeTypeToCategories(detectedMimeType)
-			log.Infof("Detected categories from MIME type: %v", detectedCategories)
-		}
-	} else if strings.HasPrefix(target, "http://") || strings.HasPrefix(target, "https://") {
-		// Handle HTTP(S) URLs
+	case isScheme(target, "http://"), isScheme(target, "https://"), isScheme(target, "dms://"):
 		if detectedRequestType == "" {
 			detectedRequestType = "url"
 		}
-		log.Infof("Detected HTTP(S) URL")
-	} else if strings.HasPrefix(target, "dms://") {
-		// Handle DMS internal URLs (theme/plugin install, etc.)
-		if detectedRequestType == "" {
-			detectedRequestType = "url"
-		}
-		log.Infof("Detected DMS internal URL")
-	} else if _, err := os.Stat(target); err == nil {
-		// Handle local file paths directly (not file:// URIs)
-		// Convert to absolute path
-		if absPath, err := filepath.Abs(target); err == nil {
-			actualTarget = absPath
-		}
+		log.Infof("Detected URL: %s", target)

+	default:
+		if _, err := os.Stat(target); err != nil {
+			break
+		}
+		if abs, err := filepath.Abs(target); err == nil {
+			actualTarget = abs
+		}
 		if detectedRequestType == "url" || detectedRequestType == "" {
 			detectedRequestType = "file"
 		}
-
-		log.Infof("Detected local file path, converted to absolute: %s", actualTarget)
-
-		// Auto-detect MIME type if not provided
 		if detectedMimeType == "" {
-			ext := filepath.Ext(actualTarget)
-			if ext != "" {
-				detectedMimeType = mime.TypeByExtension(ext)
-				log.Infof("Detected MIME type from extension %s: %s", ext, detectedMimeType)
-			}
-		}
-
-		// Auto-detect categories based on MIME type if not provided
-		if len(detectedCategories) == 0 && detectedMimeType != "" {
-			detectedCategories = mimeTypeToCategories(detectedMimeType)
-			log.Infof("Detected categories from MIME type: %v", detectedCategories)
+			detectedMimeType = detectMimeFromPath(actualTarget)
 		}
+		log.Infof("Detected local file path: %s", actualTarget)
 	}

 	params := map[string]any{
@@ -174,8 +109,8 @@ func runOpen(target string) {
 		params["mimeType"] = detectedMimeType
 	}

-	if len(detectedCategories) > 0 {
-		params["categories"] = detectedCategories
+	if len(openCategories) > 0 {
+		params["categories"] = openCategories
 	}

 	if detectedRequestType != "" {
@@ -183,7 +118,7 @@ func runOpen(target string) {
 	}

 	method := "apppicker.open"
-	if detectedMimeType == "" && len(detectedCategories) == 0 && (strings.HasPrefix(target, "http://") || strings.HasPrefix(target, "https://") || strings.HasPrefix(target, "dms://")) {
+	if detectedMimeType == "" && len(openCategories) == 0 && (isScheme(target, "http://") || isScheme(target, "https://") || isScheme(target, "dms://")) {
 		method = "browser.open"
 		params["url"] = target
 	}
@@ -203,3 +138,7 @@ func runOpen(target string) {

 	log.Infof("Request sent successfully")
 }
+
+func isScheme(target, prefix string) bool {
+	return strings.HasPrefix(target, prefix)
+}
@@ -0,0 +1,203 @@
+package desktop
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/utils"
+)
+
+type Entry struct {
+	ID         string
+	Path       string
+	Name       string
+	Exec       string
+	Icon       string
+	Categories []string
+	MimeTypes  []string
+	NoDisplay  bool
+	Hidden     bool
+	Terminal   bool
+}
+
+type cachedEntry struct {
+	entry   *Entry
+	modTime time.Time
+	size    int64
+}
+
+var (
+	entryCache   = make(map[string]cachedEntry)
+	entryCacheMu sync.Mutex
+
+	listingCache   []*Entry
+	listingExpires time.Time
+	listingCacheMu sync.Mutex
+)
+
+const listingTTL = 5 * time.Second
+
+func applicationDirs() []string {
+	seen := make(map[string]bool)
+	var dirs []string
+
+	add := func(path string) {
+		if path == "" {
+			return
+		}
+		abs, err := filepath.Abs(path)
+		if err != nil {
+			abs = path
+		}
+		if seen[abs] {
+			return
+		}
+		seen[abs] = true
+		dirs = append(dirs, abs)
+	}
+
+	add(filepath.Join(utils.XDGDataHome(), "applications"))
+
+	if env := os.Getenv("XDG_DATA_DIRS"); env != "" {
+		for d := range strings.SplitSeq(env, ":") {
+			add(filepath.Join(strings.TrimSpace(d), "applications"))
+		}
+	} else {
+		add("/usr/local/share/applications")
+		add("/usr/share/applications")
+	}
+
+	home, _ := os.UserHomeDir()
+	if home != "" {
+		add(filepath.Join(home, ".local", "share", "flatpak", "exports", "share", "applications"))
+	}
+	add("/var/lib/flatpak/exports/share/applications")
+	add("/var/lib/snapd/desktop/applications")
+
+	return dirs
+}
+
+func parseEntry(path string, id string) (*Entry, error) {
+	info, err := os.Stat(path)
+	if err != nil {
+		return nil, err
+	}
+
+	entryCacheMu.Lock()
+	if c, ok := entryCache[path]; ok && c.modTime.Equal(info.ModTime()) && c.size == info.Size() {
+		entryCacheMu.Unlock()
+		return c.entry, nil
+	}
+	entryCacheMu.Unlock()
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	groups := parseGroups(data)
+	g, ok := groups["Desktop Entry"]
+	if !ok {
+		return nil, nil
+	}
+
+	entry := &Entry{
+		ID:         id,
+		Path:       path,
+		Name:       g.keys["Name"],
+		Exec:       g.keys["Exec"],
+		Icon:       g.keys["Icon"],
+		Categories: splitList(g.keys["Categories"]),
+		MimeTypes:  splitList(g.keys["MimeType"]),
+		NoDisplay:  parseBool(g.keys["NoDisplay"]),
+		Hidden:     parseBool(g.keys["Hidden"]),
+		Terminal:   parseBool(g.keys["Terminal"]),
+	}
+
+	if t := g.keys["Type"]; t != "" && t != "Application" {
+		return nil, nil
+	}
+
+	entryCacheMu.Lock()
+	entryCache[path] = cachedEntry{entry: entry, modTime: info.ModTime(), size: info.Size()}
+	entryCacheMu.Unlock()
+
+	return entry, nil
+}
+
+func relativeID(root, path string) string {
+	rel, err := filepath.Rel(root, path)
+	if err != nil {
+		return filepath.Base(path)
+	}
+	return strings.ReplaceAll(rel, string(filepath.Separator), "-")
+}
+
+func AllEntries() []*Entry {
+	listingCacheMu.Lock()
+	if time.Now().Before(listingExpires) && listingCache != nil {
+		out := listingCache
+		listingCacheMu.Unlock()
+		return out
+	}
+	listingCacheMu.Unlock()
+
+	seen := make(map[string]bool)
+	var entries []*Entry
+
+	for _, dir := range applicationDirs() {
+		_ = filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) error {
+			if err != nil || d.IsDir() {
+				return nil
+			}
+			if !strings.HasSuffix(path, ".desktop") {
+				return nil
+			}
+			id := relativeID(dir, path)
+			if seen[id] {
+				return nil
+			}
+			seen[id] = true
+
+			entry, err := parseEntry(path, id)
+			if err != nil || entry == nil {
+				return nil
+			}
+			entries = append(entries, entry)
+			return nil
+		})
+	}
+
+	listingCacheMu.Lock()
+	listingCache = entries
+	listingExpires = time.Now().Add(listingTTL)
+	listingCacheMu.Unlock()
+
+	return entries
+}
+
+func EntryByID(id string) *Entry {
+	if !strings.HasSuffix(id, ".desktop") {
+		id += ".desktop"
+	}
+	for _, entry := range AllEntries() {
+		if entry.ID == id {
+			return entry
+		}
+	}
+	return nil
+}
+
+func InvalidateCache() {
+	entryCacheMu.Lock()
+	entryCache = make(map[string]cachedEntry)
+	entryCacheMu.Unlock()
+
+	listingCacheMu.Lock()
+	listingCache = nil
+	listingExpires = time.Time{}
+	listingCacheMu.Unlock()
+}
@@ -0,0 +1,311 @@
+package desktop
+
+import (
+	"bufio"
+	"bytes"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/utils"
+)
+
+var (
+	aliasMap      map[string]string
+	subclassMap   map[string][]string
+	aliasLoaded   time.Time
+	aliasReloadMu sync.Mutex
+
+	mimeCacheMap      map[string][]string
+	mimeCacheLoaded   time.Time
+	mimeCacheReloadMu sync.Mutex
+)
+
+const aliasTTL = 60 * time.Second
+const mimeCacheTTL = 10 * time.Second
+
+func mimeDataDirs() []string {
+	var dirs []string
+	seen := make(map[string]bool)
+
+	add := func(p string) {
+		if p == "" || seen[p] {
+			return
+		}
+		seen[p] = true
+		dirs = append(dirs, p)
+	}
+
+	add(filepath.Join(utils.XDGDataHome(), "mime"))
+
+	if env := os.Getenv("XDG_DATA_DIRS"); env != "" {
+		for d := range strings.SplitSeq(env, ":") {
+			add(filepath.Join(strings.TrimSpace(d), "mime"))
+		}
+	} else {
+		add("/usr/local/share/mime")
+		add("/usr/share/mime")
+	}
+
+	return dirs
+}
+
+func loadAliasTables() {
+	aliases := make(map[string]string)
+	subclasses := make(map[string][]string)
+
+	for _, dir := range mimeDataDirs() {
+		readKV(filepath.Join(dir, "aliases"), func(k, v string) {
+			if _, ok := aliases[k]; !ok {
+				aliases[k] = v
+			}
+		})
+		readKV(filepath.Join(dir, "subclasses"), func(k, v string) {
+			subclasses[k] = append(subclasses[k], v)
+		})
+	}
+
+	aliasMap = aliases
+	subclassMap = subclasses
+	aliasLoaded = time.Now()
+}
+
+func readKV(path string, fn func(k, v string)) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return
+	}
+	scanner := bufio.NewScanner(bytes.NewReader(data))
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || line[0] == '#' {
+			continue
+		}
+		sp := strings.IndexByte(line, ' ')
+		if sp <= 0 {
+			continue
+		}
+		fn(strings.TrimSpace(line[:sp]), strings.TrimSpace(line[sp+1:]))
+	}
+}
+
+func ensureAliasTables() {
+	aliasReloadMu.Lock()
+	defer aliasReloadMu.Unlock()
+
+	if aliasMap == nil || time.Since(aliasLoaded) > aliasTTL {
+		loadAliasTables()
+	}
+}
+
+func loadMimeCache() {
+	merged := make(map[string][]string)
+	seen := make(map[string]map[string]bool)
+
+	for _, dir := range applicationDirs() {
+		data, err := os.ReadFile(filepath.Join(dir, "mimeinfo.cache"))
+		if err != nil {
+			continue
+		}
+		groups := parseGroups(data)
+		g := groups["MIME Cache"]
+		if g == nil {
+			continue
+		}
+		for mime, val := range g.keys {
+			ids := splitList(val)
+			if len(ids) == 0 {
+				continue
+			}
+			if seen[mime] == nil {
+				seen[mime] = make(map[string]bool)
+			}
+			for _, id := range ids {
+				if seen[mime][id] {
+					continue
+				}
+				seen[mime][id] = true
+				merged[mime] = append(merged[mime], id)
+			}
+		}
+	}
+
+	mimeCacheMap = merged
+	mimeCacheLoaded = time.Now()
+}
+
+func ensureMimeCache() {
+	mimeCacheReloadMu.Lock()
+	defer mimeCacheReloadMu.Unlock()
+
+	if mimeCacheMap == nil || time.Since(mimeCacheLoaded) > mimeCacheTTL {
+		loadMimeCache()
+	}
+}
+
+func cacheAppsForMime(mimeType string) []string {
+	ensureMimeCache()
+	return mimeCacheMap[mimeType]
+}
+
+func StripMimeParams(mimeType string) string {
+	if semi := strings.IndexByte(mimeType, ';'); semi >= 0 {
+		mimeType = mimeType[:semi]
+	}
+	return strings.TrimSpace(mimeType)
+}
+
+func canonicalMime(mimeType string) string {
+	ensureAliasTables()
+	mimeType = StripMimeParams(mimeType)
+	if target, ok := aliasMap[mimeType]; ok {
+		return target
+	}
+	return mimeType
+}
+
+func mimeChain(mimeType string) []string {
+	ensureAliasTables()
+
+	root := canonicalMime(mimeType)
+	visited := map[string]bool{root: true}
+	chain := []string{root}
+
+	queue := []string{root}
+	for len(queue) > 0 {
+		cur := queue[0]
+		queue = queue[1:]
+		for _, parent := range subclassMap[cur] {
+			if visited[parent] {
+				continue
+			}
+			visited[parent] = true
+			chain = append(chain, parent)
+			queue = append(queue, parent)
+		}
+	}
+
+	return chain
+}
+
+func entrySupportsMime(entry *Entry, chain []string) bool {
+	for _, m := range entry.MimeTypes {
+		canonical := canonicalMime(m)
+		if slices.Contains(chain, canonical) || slices.Contains(chain, m) {
+			return true
+		}
+	}
+	return false
+}
+
+func GetDefault(mimeType string) string {
+	merged := mergedAssociations()
+	chain := mimeChain(mimeType)
+
+	for _, m := range chain {
+		if id, ok := merged.Defaults[m]; ok {
+			if !slices.Contains(merged.Removed[m], id) {
+				return id
+			}
+		}
+	}
+
+	for _, m := range chain {
+		for _, id := range merged.Added[m] {
+			if !slices.Contains(merged.Removed[m], id) {
+				return id
+			}
+		}
+	}
+
+	for _, m := range chain {
+		for _, id := range cacheAppsForMime(m) {
+			if !slices.Contains(merged.Removed[m], id) {
+				return id
+			}
+		}
+	}
+
+	for _, m := range chain {
+		for _, entry := range AllEntries() {
+			if entry.Hidden || entry.NoDisplay {
+				continue
+			}
+			if slices.Contains(merged.Removed[m], entry.ID) {
+				continue
+			}
+			if entrySupportsMime(entry, []string{m}) {
+				return entry.ID
+			}
+		}
+	}
+
+	return ""
+}
+
+func SetDefault(mimeType, desktopID string) error {
+	return setDefaultAssociation(mimeType, desktopID)
+}
+
+func SetDefaults(mimeTypes []string, desktopID string) error {
+	return setDefaultAssociations(mimeTypes, desktopID)
+}
+
+func AppsForMime(mimeType string) []string {
+	merged := mergedAssociations()
+	chain := mimeChain(mimeType)
+	removed := make(map[string]bool)
+	for _, m := range chain {
+		for _, id := range merged.Removed[m] {
+			removed[id] = true
+		}
+	}
+
+	seen := make(map[string]bool)
+	var out []string
+
+	add := func(id string) {
+		if id == "" || removed[id] || seen[id] {
+			return
+		}
+		seen[id] = true
+		out = append(out, id)
+	}
+
+	for _, m := range chain {
+		if id := merged.Defaults[m]; id != "" {
+			add(id)
+		}
+		for _, id := range merged.Added[m] {
+			add(id)
+		}
+	}
+
+	for _, m := range chain {
+		for _, id := range cacheAppsForMime(m) {
+			add(id)
+		}
+	}
+
+	for _, entry := range AllEntries() {
+		if entry.Hidden {
+			continue
+		}
+		if entrySupportsMime(entry, chain) {
+			add(entry.ID)
+		}
+	}
+
+	return out
+}
+
+func QueryDefaults(mimeTypes []string) map[string]string {
+	out := make(map[string]string, len(mimeTypes))
+	for _, m := range mimeTypes {
+		out[m] = GetDefault(m)
+	}
+	return out
+}
@@ -0,0 +1,233 @@
+package desktop
+
+import (
+	"os"
+	"path/filepath"
+	"sync"
+	"testing"
+)
+
+func setupFakeXDG(t *testing.T) (configHome, dataHome string) {
+	t.Helper()
+	tmp := t.TempDir()
+	configHome = filepath.Join(tmp, "config")
+	dataHome = filepath.Join(tmp, "data")
+	if err := os.MkdirAll(filepath.Join(dataHome, "applications"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.MkdirAll(configHome, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("XDG_CONFIG_HOME", configHome)
+	t.Setenv("XDG_DATA_HOME", dataHome)
+	t.Setenv("XDG_DATA_DIRS", dataHome)
+	t.Setenv("XDG_CONFIG_DIRS", configHome)
+	InvalidateCache()
+
+	mimeCacheReloadMu.Lock()
+	mimeCacheMap = nil
+	mimeCacheReloadMu.Unlock()
+	aliasReloadMu.Lock()
+	aliasMap = nil
+	subclassMap = nil
+	aliasReloadMu.Unlock()
+
+	return configHome, dataHome
+}
+
+func writeFile(t *testing.T, path, content string) {
+	t.Helper()
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestParseDesktopEntry(t *testing.T) {
+	_, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "applications", "test.desktop"), `[Desktop Entry]
+Type=Application
+Name=Test
+Exec=test %f
+Icon=test
+MimeType=application/pdf;image/png;
+Categories=Office;Viewer;
+NoDisplay=false
+`)
+
+	entry := EntryByID("test.desktop")
+	if entry == nil {
+		t.Fatal("entry not found")
+	}
+	if entry.Name != "Test" {
+		t.Errorf("Name = %q", entry.Name)
+	}
+	if len(entry.MimeTypes) != 2 || entry.MimeTypes[0] != "application/pdf" {
+		t.Errorf("MimeTypes = %v", entry.MimeTypes)
+	}
+	if len(entry.Categories) != 2 || entry.Categories[1] != "Viewer" {
+		t.Errorf("Categories = %v", entry.Categories)
+	}
+}
+
+func TestSetGetDefault(t *testing.T) {
+	configHome, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "applications", "foo.desktop"), `[Desktop Entry]
+Type=Application
+Name=Foo
+MimeType=application/pdf;
+`)
+	writeFile(t, filepath.Join(dataHome, "applications", "bar.desktop"), `[Desktop Entry]
+Type=Application
+Name=Bar
+MimeType=application/pdf;
+`)
+
+	if err := SetDefault("application/pdf", "bar.desktop"); err != nil {
+		t.Fatal(err)
+	}
+
+	if got := GetDefault("application/pdf"); got != "bar.desktop" {
+		t.Errorf("GetDefault = %q want bar.desktop", got)
+	}
+
+	data, err := os.ReadFile(filepath.Join(configHome, "mimeapps.list"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !contains(string(data), "application/pdf=bar.desktop") {
+		t.Errorf("mimeapps.list missing default:\n%s", string(data))
+	}
+}
+
+func TestSetDefaultBypassesMimeSupportCheck(t *testing.T) {
+	configHome, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "applications", "dms-open.desktop"), `[Desktop Entry]
+Type=Application
+Name=DMS
+MimeType=x-scheme-handler/http;
+`)
+
+	if err := SetDefault("application/pdf", "dms-open.desktop"); err != nil {
+		t.Fatal(err)
+	}
+
+	if got := GetDefault("application/pdf"); got != "dms-open.desktop" {
+		t.Errorf("GetDefault = %q, want dms-open.desktop (native impl must not enforce MimeType= check)", got)
+	}
+
+	data, _ := os.ReadFile(filepath.Join(configHome, "mimeapps.list"))
+	if !contains(string(data), "application/pdf=dms-open.desktop") {
+		t.Errorf("mimeapps.list missing override:\n%s", string(data))
+	}
+}
+
+func TestAliasResolution(t *testing.T) {
+	_, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "mime", "aliases"), "text/javascript application/javascript\n")
+	writeFile(t, filepath.Join(dataHome, "applications", "editor.desktop"), `[Desktop Entry]
+Type=Application
+Name=Editor
+MimeType=application/javascript;
+`)
+	writeFile(t, filepath.Join(dataHome, "applications", "mimeinfo.cache"), `[MIME Cache]
+application/javascript=editor.desktop;
+`)
+
+	if got := GetDefault("text/javascript"); got != "editor.desktop" {
+		t.Errorf("GetDefault(text/javascript) = %q want editor.desktop (alias resolution)", got)
+	}
+}
+
+func TestSetDefaultsBatch(t *testing.T) {
+	configHome, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "applications", "dms-open.desktop"), `[Desktop Entry]
+Type=Application
+Name=DMS
+MimeType=x-scheme-handler/http;
+`)
+
+	mimes := []string{
+		"text/plain", "text/x-csrc", "text/x-python",
+		"text/x-shellscript", "application/json",
+	}
+	if err := SetDefaults(mimes, "dms-open.desktop"); err != nil {
+		t.Fatal(err)
+	}
+
+	data, err := os.ReadFile(filepath.Join(configHome, "mimeapps.list"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, m := range mimes {
+		if !contains(string(data), m+"=dms-open.desktop") {
+			t.Errorf("missing %s default in mimeapps.list:\n%s", m, string(data))
+		}
+	}
+}
+
+func TestConcurrentSetDefaultNoCorruption(t *testing.T) {
+	configHome, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "applications", "app.desktop"), `[Desktop Entry]
+Type=Application
+Name=App
+`)
+
+	mimes := []string{
+		"a/1", "a/2", "a/3", "a/4", "a/5", "a/6", "a/7",
+	}
+
+	var wg sync.WaitGroup
+	for _, m := range mimes {
+		wg.Add(1)
+		go func(m string) {
+			defer wg.Done()
+			if err := SetDefault(m, "app.desktop"); err != nil {
+				t.Errorf("SetDefault(%s) failed: %v", m, err)
+			}
+		}(m)
+	}
+	wg.Wait()
+
+	data, err := os.ReadFile(filepath.Join(configHome, "mimeapps.list"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, m := range mimes {
+		if !contains(string(data), m+"=app.desktop") {
+			t.Errorf("lost write for %s — concurrent writes corrupted file:\n%s", m, string(data))
+		}
+	}
+}
+
+func TestMimeCacheOrdering(t *testing.T) {
+	_, dataHome := setupFakeXDG(t)
+	writeFile(t, filepath.Join(dataHome, "applications", "a.desktop"), `[Desktop Entry]
+Type=Application
+Name=A
+MimeType=image/png;
+`)
+	writeFile(t, filepath.Join(dataHome, "applications", "b.desktop"), `[Desktop Entry]
+Type=Application
+Name=B
+MimeType=image/png;
+`)
+	writeFile(t, filepath.Join(dataHome, "applications", "mimeinfo.cache"), `[MIME Cache]
+image/png=b.desktop;a.desktop;
+`)
+
+	if got := GetDefault("image/png"); got != "b.desktop" {
+		t.Errorf("GetDefault should follow mimeinfo.cache order: got %q want b.desktop", got)
+	}
+}
+
+func contains(haystack, needle string) bool {
+	for i := 0; i+len(needle) <= len(haystack); i++ {
+		if haystack[i:i+len(needle)] == needle {
+			return true
+		}
+	}
+	return false
+}
@@ -0,0 +1,226 @@
+package desktop
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"slices"
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/utils"
+)
+
+var mimeappsWriteMu sync.Mutex
+
+const (
+	groupDefaults = "Default Applications"
+	groupAdded    = "Added Associations"
+	groupRemoved  = "Removed Associations"
+)
+
+type MimeAssociations struct {
+	Defaults map[string]string
+	Added    map[string][]string
+	Removed  map[string][]string
+}
+
+func newAssociations() *MimeAssociations {
+	return &MimeAssociations{
+		Defaults: make(map[string]string),
+		Added:    make(map[string][]string),
+		Removed:  make(map[string][]string),
+	}
+}
+
+func mimeappsSearchPaths() []string {
+	var paths []string
+	seen := make(map[string]bool)
+
+	add := func(p string) {
+		if p == "" || seen[p] {
+			return
+		}
+		seen[p] = true
+		paths = append(paths, p)
+	}
+
+	add(filepath.Join(utils.XDGConfigHome(), "mimeapps.list"))
+
+	if env := os.Getenv("XDG_CONFIG_DIRS"); env != "" {
+		for d := range strings.SplitSeq(env, ":") {
+			add(filepath.Join(strings.TrimSpace(d), "mimeapps.list"))
+		}
+	} else {
+		add("/etc/xdg/mimeapps.list")
+	}
+
+	add(filepath.Join(utils.XDGDataHome(), "applications", "mimeapps.list"))
+
+	if env := os.Getenv("XDG_DATA_DIRS"); env != "" {
+		for d := range strings.SplitSeq(env, ":") {
+			add(filepath.Join(strings.TrimSpace(d), "applications", "mimeapps.list"))
+		}
+	} else {
+		add("/usr/local/share/applications/mimeapps.list")
+		add("/usr/share/applications/mimeapps.list")
+	}
+
+	return paths
+}
+
+func mimeappsWritePath() string {
+	return filepath.Join(utils.XDGConfigHome(), "mimeapps.list")
+}
+
+func readAssociations(path string) (*MimeAssociations, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	groups := parseGroups(data)
+	assoc := newAssociations()
+
+	if g := groups[groupDefaults]; g != nil {
+		for mime, val := range g.keys {
+			parts := splitList(val)
+			if len(parts) > 0 {
+				assoc.Defaults[mime] = parts[0]
+			}
+		}
+	}
+
+	if g := groups[groupAdded]; g != nil {
+		for mime, val := range g.keys {
+			assoc.Added[mime] = splitList(val)
+		}
+	}
+
+	if g := groups[groupRemoved]; g != nil {
+		for mime, val := range g.keys {
+			assoc.Removed[mime] = splitList(val)
+		}
+	}
+
+	return assoc, nil
+}
+
+func mergedAssociations() *MimeAssociations {
+	merged := newAssociations()
+
+	for _, path := range mimeappsSearchPaths() {
+		assoc, err := readAssociations(path)
+		if err != nil {
+			continue
+		}
+		for mime, app := range assoc.Defaults {
+			if _, ok := merged.Defaults[mime]; !ok {
+				merged.Defaults[mime] = app
+			}
+		}
+		for mime, apps := range assoc.Added {
+			merged.Added[mime] = append(merged.Added[mime], apps...)
+		}
+		for mime, apps := range assoc.Removed {
+			merged.Removed[mime] = append(merged.Removed[mime], apps...)
+		}
+	}
+
+	return merged
+}
+
+func writeUserMimeapps(update func(*MimeAssociations)) error {
+	mimeappsWriteMu.Lock()
+	defer mimeappsWriteMu.Unlock()
+
+	path := mimeappsWritePath()
+
+	assoc, err := readAssociations(path)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return err
+		}
+		assoc = newAssociations()
+	}
+
+	update(assoc)
+
+	var buf bytes.Buffer
+	w := bufio.NewWriter(&buf)
+
+	writeSection := func(name string, entries map[string]string) {
+		fmt.Fprintf(w, "[%s]\n", name)
+		keys := make([]string, 0, len(entries))
+		for k := range entries {
+			keys = append(keys, k)
+		}
+		sort.Strings(keys)
+		for _, k := range keys {
+			fmt.Fprintf(w, "%s=%s\n", k, entries[k])
+		}
+		fmt.Fprintln(w)
+	}
+
+	flatten := func(m map[string][]string) map[string]string {
+		out := make(map[string]string, len(m))
+		for k, list := range m {
+			out[k] = strings.Join(list, ";") + ";"
+		}
+		return out
+	}
+
+	writeSection(groupDefaults, assoc.Defaults)
+	writeSection(groupAdded, flatten(assoc.Added))
+	writeSection(groupRemoved, flatten(assoc.Removed))
+
+	if err := w.Flush(); err != nil {
+		return err
+	}
+
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(path, buf.Bytes(), 0o644)
+}
+
+func setDefaultAssociation(mimeType, desktopID string) error {
+	return setDefaultAssociations([]string{mimeType}, desktopID)
+}
+
+func setDefaultAssociations(mimeTypes []string, desktopID string) error {
+	if !strings.HasSuffix(desktopID, ".desktop") {
+		desktopID += ".desktop"
+	}
+	return writeUserMimeapps(func(assoc *MimeAssociations) {
+		for _, mimeType := range mimeTypes {
+			if mimeType == "" {
+				continue
+			}
+			assoc.Defaults[mimeType] = desktopID
+			existing := assoc.Added[mimeType]
+			if !slices.Contains(existing, desktopID) {
+				assoc.Added[mimeType] = append(existing, desktopID)
+			}
+			removed, ok := assoc.Removed[mimeType]
+			if !ok {
+				continue
+			}
+			filtered := removed[:0]
+			for _, id := range removed {
+				if id != desktopID {
+					filtered = append(filtered, id)
+				}
+			}
+			switch {
+			case len(filtered) == 0:
+				delete(assoc.Removed, mimeType)
+			default:
+				assoc.Removed[mimeType] = filtered
+			}
+		}
+	})
+}
@@ -0,0 +1,80 @@
+package desktop
+
+import (
+	"bufio"
+	"bytes"
+	"strings"
+)
+
+type group struct {
+	keys map[string]string
+}
+
+func parseGroups(data []byte) map[string]*group {
+	groups := make(map[string]*group)
+	var current *group
+
+	scanner := bufio.NewScanner(bytes.NewReader(data))
+	scanner.Buffer(make([]byte, 64*1024), 1024*1024)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || line[0] == '#' {
+			continue
+		}
+
+		if line[0] == '[' && strings.HasSuffix(line, "]") {
+			name := line[1 : len(line)-1]
+			g, ok := groups[name]
+			if !ok {
+				g = &group{keys: make(map[string]string)}
+				groups[name] = g
+			}
+			current = g
+			continue
+		}
+
+		if current == nil {
+			continue
+		}
+
+		eq := strings.IndexByte(line, '=')
+		if eq <= 0 {
+			continue
+		}
+
+		key := strings.TrimSpace(line[:eq])
+		if bracket := strings.IndexByte(key, '['); bracket > 0 {
+			key = key[:bracket]
+		}
+		if _, ok := current.keys[key]; ok {
+			continue
+		}
+		current.keys[key] = strings.TrimSpace(line[eq+1:])
+	}
+
+	return groups
+}
+
+func splitList(value string) []string {
+	if value == "" {
+		return nil
+	}
+	parts := strings.Split(value, ";")
+	out := make([]string, 0, len(parts))
+	for _, p := range parts {
+		p = strings.TrimSpace(p)
+		if p == "" {
+			continue
+		}
+		out = append(out, p)
+	}
+	return out
+}
+
+func parseBool(value string) bool {
+	switch strings.ToLower(strings.TrimSpace(value)) {
+	case "true", "1", "yes":
+		return true
+	}
+	return false
+}
@@ -3,6 +3,7 @@ package apppicker
 import (
 	"net"

+	"github.com/AvengeMedia/DankMaterialShell/core/internal/desktop"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/models"
 )
@@ -32,7 +33,7 @@ func handleOpen(conn net.Conn, req models.Request, manager *Manager) {
 	event := OpenEvent{
 		Target:      target,
 		RequestType: models.GetOr(req, "requestType", "url"),
-		MimeType:    models.GetOr(req, "mimeType", ""),
+		MimeType:    desktop.StripMimeParams(models.GetOr(req, "mimeType", "")),
 	}

 	if categories, ok := models.Get[[]any](req, "categories"); ok {
@@ -0,0 +1,154 @@
+package mime
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/desktop"
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/models"
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/params"
+)
+
+type defaultResult struct {
+	MimeType  string `json:"mimeType"`
+	DesktopID string `json:"desktopId"`
+}
+
+type appsResult struct {
+	MimeType   string   `json:"mimeType"`
+	DesktopIDs []string `json:"desktopIds"`
+}
+
+type queryResult struct {
+	Defaults map[string]string `json:"defaults"`
+}
+
+func HandleRequest(conn net.Conn, req models.Request) {
+	switch req.Method {
+	case "mime.getDefault":
+		handleGetDefault(conn, req)
+	case "mime.setDefault":
+		handleSetDefault(conn, req)
+	case "mime.setDefaults":
+		handleSetDefaults(conn, req)
+	case "mime.appsForMime":
+		handleAppsForMime(conn, req)
+	case "mime.queryDefaults":
+		handleQueryDefaults(conn, req)
+	case "mime.invalidate":
+		desktop.InvalidateCache()
+		models.Respond(conn, req.ID, models.SuccessResult{Success: true})
+	default:
+		models.RespondError(conn, req.ID, fmt.Sprintf("unknown method: %s", req.Method))
+	}
+}
+
+func handleGetDefault(conn net.Conn, req models.Request) {
+	mimeType, err := mimeParam(req.Params, "mimeType")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	models.Respond(conn, req.ID, defaultResult{
+		MimeType:  mimeType,
+		DesktopID: desktop.GetDefault(mimeType),
+	})
+}
+
+func handleSetDefault(conn net.Conn, req models.Request) {
+	mimeType, err := mimeParam(req.Params, "mimeType")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	desktopID, err := params.StringNonEmpty(req.Params, "desktopId")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	if err := desktop.SetDefault(mimeType, desktopID); err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	models.Respond(conn, req.ID, models.SuccessResult{Success: true})
+}
+
+func handleSetDefaults(conn net.Conn, req models.Request) {
+	desktopID, err := params.StringNonEmpty(req.Params, "desktopId")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	mimeTypes, err := mimeListParam(req, "mimeTypes")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	if err := desktop.SetDefaults(mimeTypes, desktopID); err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	models.Respond(conn, req.ID, models.SuccessResult{Success: true})
+}
+
+func handleAppsForMime(conn net.Conn, req models.Request) {
+	mimeType, err := mimeParam(req.Params, "mimeType")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	ids := desktop.AppsForMime(mimeType)
+	if ids == nil {
+		ids = []string{}
+	}
+	models.Respond(conn, req.ID, appsResult{
+		MimeType:   mimeType,
+		DesktopIDs: ids,
+	})
+}
+
+func handleQueryDefaults(conn net.Conn, req models.Request) {
+	mimeTypes, err := mimeListParam(req, "mimeTypes")
+	if err != nil {
+		models.RespondError(conn, req.ID, err.Error())
+		return
+	}
+	models.Respond(conn, req.ID, queryResult{
+		Defaults: desktop.QueryDefaults(mimeTypes),
+	})
+}
+
+func mimeParam(p map[string]any, key string) (string, error) {
+	raw, err := params.StringNonEmpty(p, key)
+	if err != nil {
+		return "", err
+	}
+	canonical := desktop.StripMimeParams(raw)
+	if canonical == "" {
+		return "", fmt.Errorf("invalid '%s' parameter", key)
+	}
+	return canonical, nil
+}
+
+func mimeListParam(req models.Request, key string) ([]string, error) {
+	raw, ok := models.Get[[]any](req, key)
+	if !ok {
+		return nil, fmt.Errorf("missing or invalid '%s' parameter", key)
+	}
+	out := make([]string, 0, len(raw))
+	for _, v := range raw {
+		s, ok := v.(string)
+		if !ok {
+			continue
+		}
+		canonical := desktop.StripMimeParams(s)
+		if canonical == "" {
+			continue
+		}
+		out = append(out, canonical)
+	}
+	if len(out) == 0 {
+		return nil, fmt.Errorf("no valid mime types provided")
+	}
+	return out, nil
+}
@@ -16,6 +16,7 @@ import (
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/freedesktop"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/location"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/loginctl"
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/mime"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/models"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/network"
 	serverPlugins "github.com/AvengeMedia/DankMaterialShell/core/internal/server/plugins"
@@ -92,6 +93,11 @@ func RouteRequest(conn net.Conn, req models.Request) {
 		return
 	}

+	if strings.HasPrefix(req.Method, "mime.") {
+		mime.HandleRequest(conn, req)
+		return
+	}
+
 	if strings.HasPrefix(req.Method, "browser.") || strings.HasPrefix(req.Method, "apppicker.") {
 		if appPickerManager == nil {
 			models.RespondError(conn, req.ID, "apppicker manager not initialized")
@@ -850,6 +850,8 @@ Item {

            filePickerModal.targetData = data.target;
            filePickerModal.targetDataLabel = data.requestType || "file";
+            filePickerModal.mimeType = data.mimeType || "";
+            filePickerModal.rememberMimeTypes = [];

            if (data.categories && data.categories.length > 0) {
                filePickerModal.categoryFilter = data.categories;
@@ -19,9 +19,19 @@ DankModal {
    property var categoryFilter: []
    property var usageHistoryKey: ""
    property bool showTargetData: true
+    property string mimeType: ""
+    property var rememberMimeTypes: []
+    property bool rememberChoice: false
+    property var mimeMatchedAppIds: []

    signal applicationSelected(var app, string targetData)

+    function _normAppId(id) {
+        if (!id)
+            return "";
+        return id.replace(/\.desktop$/, "").toLowerCase();
+    }
+
    shouldBeVisible: false
    allowStacking: true
    modalWidth: 520
@@ -37,6 +47,8 @@ DankModal {

    onOpened: {
        searchQuery = "";
+        rememberChoice = false;
+        fetchMimeMatches();
        updateApplicationList();
        selectedIndex = 0;
        Qt.callLater(() => {
@@ -47,22 +59,55 @@ DankModal {
        });
    }

+    function fetchMimeMatches() {
+        mimeMatchedAppIds = [];
+        const queriedMime = mimeType;
+        if (queriedMime.length === 0)
+            return;
+        DMSService.sendRequest("mime.appsForMime", {
+            "mimeType": queriedMime
+        }, response => {
+            if (queriedMime !== root.mimeType)
+                return;
+            if (response.error) {
+                log.warn("mime.appsForMime failed:", response.error);
+                return;
+            }
+            const ids = (response.result && response.result.desktopIds) || [];
+            mimeMatchedAppIds = ids.map(_normAppId);
+            updateApplicationList();
+        });
+    }
+
+    function _appMatchesMime(app, mime) {
+        const list = app && (app.mimeTypes || app.mimeType);
+        return !!list && !!list.includes && list.includes(mime);
+    }
+
    function updateApplicationList() {
        applicationsModel.clear();
        const apps = AppSearchService.applications;
        const usageHistory = usageHistoryKey && SettingsData[usageHistoryKey] ? SettingsData[usageHistoryKey] : {};
+        const hasCategoryFilter = categoryFilter.length > 0;
+        const hasMime = mimeType.length > 0;
+        const hasMimeMatches = mimeMatchedAppIds.length > 0;
+        const lowerQuery = searchQuery.toLowerCase();
        let filteredApps = [];

        for (const app of apps) {
-            if (!app || !app.categories)
+            if (!app)
                continue;
-            let matchesCategory = categoryFilter.length === 0;
+            const appId = _normAppId(app.id || app.execString || app.exec || "");
+            const mimeIdMatch = hasMimeMatches && mimeMatchedAppIds.includes(appId);
+            const mimeFieldMatch = hasMime && _appMatchesMime(app, mimeType);
+            const mimeMatch = mimeIdMatch || mimeFieldMatch;

-            if (categoryFilter.length > 0) {
+            let categoryMatch = false;
+            if (hasCategoryFilter && app.categories) {
                try {
                    for (const cat of app.categories) {
                        if (categoryFilter.includes(cat)) {
-                            matchesCategory = true;
+                            categoryMatch = true;
                            break;
                        }
                    }
@@ -72,24 +117,28 @@ DankModal {
                }
            }

-            if (matchesCategory) {
-                const name = app.name || "";
-                const lowerName = name.toLowerCase();
-                const lowerQuery = searchQuery.toLowerCase();
+            const include = (!hasCategoryFilter && !hasMime) || mimeMatch || categoryMatch;
+            if (!include)
+                continue;

-                if (searchQuery === "" || lowerName.includes(lowerQuery)) {
-                    filteredApps.push({
-                        name: name,
-                        icon: app.icon || "application-x-executable",
-                        exec: app.exec || app.execString || "",
-                        startupClass: app.startupWMClass || "",
-                        appData: app
-                    });
-                }
-            }
+            const name = app.name || "";
+            if (searchQuery !== "" && !name.toLowerCase().includes(lowerQuery))
+                continue;
+
+            filteredApps.push({
+                name: name,
+                icon: app.icon || "application-x-executable",
+                exec: app.exec || app.execString || "",
+                startupClass: app.startupWMClass || "",
+                appData: app,
+                mimeMatch: mimeMatch
+            });
        }

        filteredApps.sort((a, b) => {
+            if (a.mimeMatch !== b.mimeMatch) {
+                return a.mimeMatch ? -1 : 1;
+            }
            const aId = a.appData.id || a.appData.execString || a.appData.exec || "";
            const bId = b.appData.id || b.appData.execString || b.appData.exec || "";
            const aUsage = usageHistory[aId] ? usageHistory[aId].count : 0;
@@ -134,16 +183,15 @@ DankModal {
            }

            Keys.onPressed: event => {
-                if (applicationsModel.count === 0)
-                    return;
-
-                // Toggle view mode with Tab key
-                if (event.key === Qt.Key_Tab) {
-                    root.viewMode = root.viewMode === "grid" ? "list" : "grid";
+                if (event.key === Qt.Key_Tab && root.mimeType.length > 0) {
+                    root.rememberChoice = !root.rememberChoice;
                    event.accepted = true;
                    return;
                }

+                if (applicationsModel.count === 0)
+                    return;
+
                if (root.viewMode === "grid") {
                    if (event.key === Qt.Key_Left) {
                        root.keyboardNavigationActive = true;
@@ -309,6 +357,9 @@ DankModal {
                        if (root.showTargetData) {
                            usedHeight += 36 + Theme.spacingS;
                        }
+                        if (root.mimeType && root.mimeType.length > 0) {
+                            usedHeight += 36 + Theme.spacingS;
+                        }
                        return parent.height - usedHeight;
                    }
                    radius: Theme.cornerRadius
@@ -447,11 +498,38 @@ DankModal {
                        maximumLineCount: 1
                    }
                }
+
+                Item {
+                    width: parent.width
+                    height: 36
+                    visible: root.mimeType.length > 0
+
+                    DankToggle {
+                        anchors.left: parent.left
+                        anchors.leftMargin: Theme.spacingM
+                        anchors.right: parent.right
+                        anchors.rightMargin: Theme.spacingM
+                        anchors.verticalCenter: parent.verticalCenter
+                        checked: root.rememberChoice
+                        text: I18n.tr("Always use this app for %1").arg(root.mimeType)
+                        onToggled: checked => {
+                            root.rememberChoice = checked;
+                        }
+                    }
+                }
            }

            function launchApplication(app) {
                if (!app)
                    return;
+
+                if (root.rememberChoice && app.appId) {
+                    const targets = (root.rememberMimeTypes && root.rememberMimeTypes.length > 0) ? root.rememberMimeTypes : (root.mimeType ? [root.mimeType] : []);
+                    if (targets.length > 0) {
+                        DesktopService.setDefaultAppForMimes(targets, app.appId);
+                    }
+                }
+
                root.applicationSelected(app, root.targetData);

                if (usageHistoryKey && app.appId) {
@@ -17,6 +17,8 @@ AppPickerModal {
    viewMode: SettingsData.browserPickerViewMode || "grid"
    usageHistoryKey: "browserUsageHistory"
    showTargetData: true
+    mimeType: url.startsWith("https://") ? "x-scheme-handler/https" : (url.startsWith("http://") ? "x-scheme-handler/http" : "")
+    rememberMimeTypes: ["x-scheme-handler/http", "x-scheme-handler/https", "text/html", "application/xhtml+xml"]

    function shellEscape(str) {
        return "'" + str.replace(/'/g, "'\\''") + "'";
@@ -244,8 +244,7 @@ Rectangle {
                    "id": "default_apps",
                    "text": I18n.tr("Default Apps"),
                    "icon": "star",
-                    "tabIndex": 34,
-					"gioOnly": true
+                    "tabIndex": 34
                },
                {
                    "id": "running_apps",
@@ -364,8 +363,6 @@ Rectangle {
            return false;
        if (item.updaterOnly && !SystemUpdateService.sysupdateAvailable)
            return false;
-		if (item.gioOnly && !DesktopService.gioAvailable)
-			return false;
        return true;
    }

@@ -19,7 +19,7 @@ Item {
            PDFReader: 6,
            Mail: 7,
            Terminal: 8,
-			Calendar: 9
+            Calendar: 9
        })

    property string currentWebBrowserAppId: ""
@@ -35,63 +35,17 @@ Item {

    property var categoryModels: ({})

-	// A curated list of MIME types for each category.
-	// The first one is used for fetching the apps list and current default,
-	// the rest are for setting the default app.
+    // A curated list of MIME types for each category.
+    // The first one is used for fetching the apps list and current default,
+    // the rest are for setting the default app.
    readonly property var mimeMapping: ({
-            [root.appCategory.WebBrowser]: [
-				"x-scheme-handler/https",
-				"x-scheme-handler/http",
-				"text/html",
-				"application/xhtml+xml"
-			],
-            [root.appCategory.FileManager]: [
-				"inode/directory",
-				"x-scheme-handler/file"
-			],
-            [root.appCategory.TextEditor]: [
-				"text/plain",
-				"application/x-zerosize",
-				"text/x-c++src",
-				"text/x-csrc",
-				"text/x-python",
-				"text/x-shellscript",
-				"application/json"
-			],
-            [root.appCategory.ImageViewer]: [
-				"image/png",
-				"image/jpeg",
-				"image/gif",
-				"image/bmp",
-				"image/webp",
-				"image/avif",
-				"image/svg+xml"
-			],
-            [root.appCategory.VideoPlayer]: [
-				"video/mp4",
-				"video/x-matroska",
-				"video/webm",
-				"video/avi",
-				"video/mpeg",
-				"video/quicktime",
-				"video/x-msvideo"
-			],
-            [root.appCategory.MusicPlayer]: [
-				"audio/mpeg",
-				"audio/x-flac",
-				"audio/wav",
-				"audio/ogg",
-				"audio/aac",
-				"audio/webm"
-			],
-            [root.appCategory.PDFReader]: [
-				"application/pdf",
-				"application/x-ext-pdf",
-				"application/x-bzpdf",
-				"application/x-gzpdf",
-				"application/vnd.comicbook-rar",
-				"application/vnd.comicbook+zip"
-			],
+            [root.appCategory.WebBrowser]: ["x-scheme-handler/https", "x-scheme-handler/http", "text/html", "application/xhtml+xml"],
+            [root.appCategory.FileManager]: ["inode/directory", "x-scheme-handler/file"],
+            [root.appCategory.TextEditor]: ["text/plain", "application/x-zerosize", "text/x-c++src", "text/x-csrc", "text/x-python", "text/x-shellscript", "application/json"],
+            [root.appCategory.ImageViewer]: ["image/png", "image/jpeg", "image/gif", "image/bmp", "image/webp", "image/avif", "image/svg+xml"],
+            [root.appCategory.VideoPlayer]: ["video/mp4", "video/x-matroska", "video/webm", "video/avi", "video/mpeg", "video/quicktime", "video/x-msvideo"],
+            [root.appCategory.MusicPlayer]: ["audio/mpeg", "audio/x-flac", "audio/wav", "audio/ogg", "audio/aac", "audio/webm"],
+            [root.appCategory.PDFReader]: ["application/pdf", "application/x-ext-pdf", "application/x-bzpdf", "application/x-gzpdf", "application/vnd.comicbook-rar", "application/vnd.comicbook+zip"],
            [root.appCategory.Mail]: ["x-scheme-handler/mailto"],
            [root.appCategory.Calendar]: ["x-scheme-handler/calendar"],
            [root.appCategory.Terminal]: ["terminal"] // Special
@@ -111,11 +65,13 @@ Item {
    }

    function getAppDisplayName(appId) {
+        if (appId === root.dmsChooserId || appId === "dms-open") {
+            return root.dmsChooserLabel;
+        }
        let entry = DesktopEntries.heuristicLookup(appId);
        if (entry && entry.name) {
            return entry.name;
        }
-        // If the appname can't be found, show the appID
        const withoutSuffix = appId.replace(/\.desktop$/, "");
        if (withoutSuffix !== appId) {
            entry = DesktopEntries.heuristicLookup(withoutSuffix);
@@ -126,14 +82,28 @@ Item {
        return appId;
    }

+    readonly property string dmsChooserId: "dms-open.desktop"
+    readonly property string dmsChooserLabel: I18n.tr("DMS Chooser")
+
+    function withDmsChooser(entries) {
+        const filtered = (entries || []).filter(e => e.value !== root.dmsChooserId && e.value !== "dms-open");
+        return [
+            {
+                text: root.dmsChooserLabel,
+                value: root.dmsChooserId
+            }
+        ].concat(filtered);
+    }
+
    function loadCategoryModel(categoryKey, categorySearchName) {
        const apps = loadAppSearchCategory(categorySearchName);
        const appIds = apps.map(app => app.id || app.execString || "").filter(id => id);
        let models = Object.assign({}, root.categoryModels);
-        models[categoryKey] = appIds.map(id => ({
-            text: root.getAppDisplayName(id),
-            value: id
-        }));
+        const entries = appIds.map(id => ({
+                    text: root.getAppDisplayName(id),
+                    value: id
+                }));
+        models[categoryKey] = categoryKey === root.appCategory.Terminal ? entries : root.withDmsChooser(entries);
        root.categoryModels = models;
    }

@@ -147,9 +117,9 @@ Item {
                loadCategoryModel(root.appCategory.Terminal, "TerminalEmulator");
                getDefaultTerminal();
                break;
-			case root.appCategory.WebBrowser:
+            case root.appCategory.WebBrowser:
                // When using the MIME type, stuff like dms-run shows up.
-				// It's probably better to use the category.
+                // It's probably better to use the category.
                loadCategoryModel(root.appCategory.WebBrowser, "WebBrowser");
                DesktopService.getDefaultApp(mimeMapping[category][0], category.toString());
                break;
@@ -201,7 +171,7 @@ Item {
    Component {
        id: xdgGetDefaultTerminal
        Process {
-			property string configPath: Quickshell.env("XDG_CONFIG_HOME") || (Quickshell.env("HOME") + "/.config")
+            property string configPath: Quickshell.env("XDG_CONFIG_HOME") || (Quickshell.env("HOME") + "/.config")

            command: ["sh", "-c", `cat '${configPath}/xdg-terminals.list'`]
            stdout: StdioCollector {
@@ -231,30 +201,24 @@ Item {
        target: DesktopService

        function onGetAppsForMimeResult(mimeType, appIds, callbackId) {
-            if (!appIds || appIds.length === 0) {
-                log.info("No apps found for MIME type:", mimeType);
-                return;
-            }
-
            let categoryIndex = parseInt(callbackId);
            let models = Object.assign({}, root.categoryModels);

-            models[categoryIndex] = appIds.map(id => {
-                return {
-                    text: root.getAppDisplayName(id),
-                    value: id
-                };
-            });
+            const entries = (appIds || []).map(id => ({
+                        text: root.getAppDisplayName(id),
+                        value: id
+                    }));

+            models[categoryIndex] = root.withDmsChooser(entries);
            root.categoryModels = models;
        }

        function onGetDefaultAppResult(mimeType, desktopFileId, callbackId) {
            if (!desktopFileId) {
                log.info("No default app found for MIME type:", mimeType);
-				return
+                return;
            }
-			root[propertyName(parseInt(callbackId))] = desktopFileId;
+            root[propertyName(parseInt(callbackId))] = desktopFileId;
        }
    }

@@ -263,11 +227,11 @@ Item {
        options: (root.categoryModels[category] || []).map(opt => opt.text)
        enabled: options.length > 0
        emptyText: options.length > 0 ? I18n.tr("Unset", "Unset") : ""
-		opacity: options.length > 0 ? 1 : 0.5
+        opacity: options.length > 0 ? 1 : 0.5
        currentValue: {
            let id = root[propertyName(category)];
            if (!id || id.length === 0) {
-				return ""
+                return "";
            }
            return root.getAppDisplayName(id);
        }
@@ -278,11 +242,7 @@ Item {
                if (category === root.appCategory.Terminal) {
                    root.setDefaultTerminal(found.value);
                } else {
-					// Set the default app for all MIME types in the category
-					// If the app doesn't support a MIME type, it will be ignored
-					root.mimeMapping[category].forEach(mimeType => {
-                    	DesktopService.setDefaultApp(mimeType, found.value, category.toString());
-					});
+                    DesktopService.setDefaultAppForMimes(root.mimeMapping[category], found.value, category.toString());
                }
            }
        }
@@ -309,16 +269,16 @@ Item {

                AppSelector {
                    text: I18n.tr("Web Browser", "Web Browser")
-					tags: ["web", "browser", "internet"]
+                    tags: ["web", "browser", "internet"]
                    category: root.appCategory.WebBrowser
-					description: I18n.tr("Handles links and opens HTML files", "Handles links and opens HTML files")
+                    description: I18n.tr("Handles links and opens HTML files", "Handles links and opens HTML files")
                }

                AppSelector {
                    text: I18n.tr("Mail", "Mail")
                    category: root.appCategory.Mail
-					tags: ["mail", "email"]
-					description: I18n.tr("Handles mailto links", "Handles mailto links")
+                    tags: ["mail", "email"]
+                    description: I18n.tr("Handles mailto links", "Handles mailto links")
                }
            }

@@ -328,21 +288,21 @@ Item {

                AppSelector {
                    text: I18n.tr("File Manager", "File Manager")
-					tags: ["file", "manager"]
+                    tags: ["file", "manager"]
                    category: root.appCategory.FileManager
-					description: I18n.tr("Manages files and directories", "Manages files and directories")
+                    description: I18n.tr("Manages files and directories", "Manages files and directories")
                }
                AppSelector {
                    text: I18n.tr("Terminal", "Terminal")
                    category: root.appCategory.Terminal
-					tags: ["terminal", "console"]
-					description: I18n.tr("Used for xdg-terminal-exec", "Used for xdg-terminal-exec")
+                    tags: ["terminal", "console"]
+                    description: I18n.tr("Used for xdg-terminal-exec", "Used for xdg-terminal-exec")
                }
-				AppSelector {
+                AppSelector {
                    text: I18n.tr("Calendar", "Calendar")
                    category: root.appCategory.Calendar
-					tags: ["calendar", "events"]
-					description: I18n.tr("Manages calendar events", "Manages calendar events")
+                    tags: ["calendar", "events"]
+                    description: I18n.tr("Manages calendar events", "Manages calendar events")
                }
            }

@@ -353,14 +313,14 @@ Item {
                AppSelector {
                    text: I18n.tr("Text Editor", "Text Editor")
                    category: root.appCategory.TextEditor
-					tags: ["text", "editor"]
-					description: I18n.tr("For editing plain text files", "For editing plain text files")
+                    tags: ["text", "editor"]
+                    description: I18n.tr("For editing plain text files", "For editing plain text files")
                }
                AppSelector {
                    text: I18n.tr("PDF Reader", "PDF Reader")
                    category: root.appCategory.PDFReader
-					tags: ["pdf", "reader"]
-					description: I18n.tr("For reading PDF files", "For reading PDF files")
+                    tags: ["pdf", "reader"]
+                    description: I18n.tr("For reading PDF files", "For reading PDF files")
                }
            }

@@ -370,20 +330,20 @@ Item {
                AppSelector {
                    text: I18n.tr("Image Viewer", "Image Viewer")
                    category: root.appCategory.ImageViewer
-					tags: ["image", "viewer"]
-					description: I18n.tr("Opens image files", "Opens image files")
+                    tags: ["image", "viewer"]
+                    description: I18n.tr("Opens image files", "Opens image files")
                }
                AppSelector {
                    text: I18n.tr("Video Player", "Video Player")
                    category: root.appCategory.VideoPlayer
-					tags: ["video", "player"]
-					description: I18n.tr("Plays video files", "Plays video files")
+                    tags: ["video", "player"]
+                    description: I18n.tr("Plays video files", "Plays video files")
                }
                AppSelector {
                    text: I18n.tr("Music Player", "Music Player")
                    category: root.appCategory.MusicPlayer
-					tags: ["music", "player"]
-					description: I18n.tr("Plays audio files", "Plays audio files")
+                    tags: ["music", "player"]
+                    description: I18n.tr("Plays audio files", "Plays audio files")
                }
            }
        }
@@ -1,35 +1,16 @@
 pragma Singleton
 pragma ComponentBehavior: Bound
-import Quickshell.Io

 import QtQuick
 import Quickshell
+import qs.Common
+import qs.Services

 Singleton {
    id: root

+    readonly property var log: Log.scoped("DesktopService")
    property var _cache: ({})
-	property bool gioAvailable: false;
-	// For the queue that setDefaultApp uses
-	property var _setDefaultAppQueue: []
-	property bool _isProcessingQueue: false
-
-	Component.onCompleted: {
-		checkGioAndXdgMime.running = true;
-	}
-
-	Process {
-		id: checkGioAndXdgMime
-		command: ["sh", "-c", "which gio && which xdg-mime"]
-		running: false
-		onExited: (exitCode) => {
-			if (exitCode === 0) {
-				root.gioAvailable = true;
-			} else {
-				root.gioAvailable = false;
-			}
-		}
-	}

    function resolveIconPath(moddedAppId) {
        if (!moddedAppId)
@@ -39,18 +20,15 @@ Singleton {
            return _cache[moddedAppId];

        const result = (function () {
-                // 1. Try heuristic lookup (standard)
                const entry = DesktopEntries.heuristicLookup(moddedAppId);
                let icon = Quickshell.iconPath(entry?.icon, true);
                if (icon && icon !== "")
                    return icon;

-                // 2. Try the appId itself as an icon name
                icon = Quickshell.iconPath(moddedAppId, true);
                if (icon && icon !== "")
                    return icon;

-                // 3. Try variations of the appId (lowercase, last part)
                const appIds = [moddedAppId.toLowerCase()];
                const lastPart = moddedAppId.split('.').pop();
                if (lastPart && lastPart !== moddedAppId) {
@@ -64,8 +42,6 @@ Singleton {
                        return icon;
                }

-                // 4. Deep search in all desktop entries (if the above fail)
-                // This is slow-ish but only happens once for failed icons
                const strippedId = moddedAppId.replace(/-bin$/, "").toLowerCase();
                const allEntries = DesktopEntries.applications.values;
                for (let i = 0; i < allEntries.length; i++) {
@@ -81,7 +57,6 @@ Singleton {
                    }
                }

-                // 5. Nix/Guix specific store check (as a last resort)
                for (const appId of appIds) {
                    let execPath = entry?.execString?.replace(/\/bin.*/, "");
                    if (!execPath)
@@ -112,180 +87,53 @@ Singleton {
        return result;
    }

+    signal getDefaultAppResult(string mimeType, string desktopFileId, string callbackId)
+    signal getAppsForMimeResult(string mimeType, var appIds, string callbackId)

-	// Set default app for a MIME type
-	Component {
-		id: gioSetDefaultApp
+    function setDefaultApp(mimeType, desktopFileId, callbackId = "") {
+        setDefaultAppForMimes([mimeType], desktopFileId, callbackId);
+    }

-		Process {
-			property string targetMimeType: ""
-			property string targetDesktopFileId: ""
-			property string callbackId: ""
-
-			// Check if the app actually supports the MIME type before setting it as default
-			// This uses a shell script
-			command: ["sh", "-c", `
-				apps=$(gio mime "${targetMimeType}" 2>/dev/null | grep -v "^Default" | awk '{print $1}')
-				if echo "$apps" | grep -Fxq "${targetDesktopFileId}"; then
-					xdg-mime default "${targetDesktopFileId}" "${targetMimeType}"
-					gio mime "${targetMimeType}" "${targetDesktopFileId}"
-				fi
-			`]
-
-            onExited: (exitCode, exitStatus) => {
-                const success = (exitCode === 0)
-                if (!success) {
-                    log.error("DesktopService: failed to set default app for", targetMimeType, "to", targetDesktopFileId, "(exit code:", exitCode + ")")
-                }
-                root._processDefaultAppQueue()
-                destroy()
+    function setDefaultAppForMimes(mimeTypes, desktopFileId, callbackId = "") {
+        if (!desktopFileId.endsWith(".desktop")) {
+            desktopFileId += ".desktop";
+        }
+        const filtered = (mimeTypes || []).filter(m => m && m.length > 0);
+        if (filtered.length === 0)
+            return;
+        DMSService.sendRequest("mime.setDefaults", {
+            "mimeTypes": filtered,
+            "desktopId": desktopFileId
+        }, response => {
+            if (response.error) {
+                log.warn("DesktopService.setDefaultApp failed:", response.error, "mimes:", filtered, "app:", desktopFileId);
            }
-        }
-    }
-
-	function setDefaultApp(mimeType, desktopFileId, callbackId = "") {
-		// Add .desktop in case it's missing, xdg-mime needs it
-		if (!desktopFileId.endsWith(".desktop")) {
-			desktopFileId += ".desktop";
-		}
-
-        // Queue the request to avoid race conditions
-        _setDefaultAppQueue.push({
-            mimeType: mimeType,
-            desktopFileId: desktopFileId,
-            callbackId: callbackId
-        })
-
-        // Start processing the queue if not already running
-        if (!_isProcessingQueue) {
-            _processDefaultAppQueue()
-        }
-    }
-
-	function _processDefaultAppQueue() {
-		if (_setDefaultAppQueue.length === 0) {
-			_isProcessingQueue = false;
-			return;
-		}
-
-		_isProcessingQueue = true;
-		const request = _setDefaultAppQueue.shift();
-
-        const proc = gioSetDefaultApp.createObject(root, {
-            targetMimeType: request.mimeType,
-            targetDesktopFileId: request.desktopFileId,
-            callbackId: request.callbackId,
-            running: true
-        })
-
-        if (!proc) {
-            log.warn("DesktopService: couldn't create process for", request.mimeType, request.desktopFileId)
-            _processDefaultAppQueue()
-        }
-    }
-
-
-
-    // Get default app for a MIME type
-    Component {
-        id: xdgGetDefaultApp
-
-        Process {
-            property string targetMimeType: ""
-            property string callbackId: ""
-
-			stdout: StdioCollector {
-				onStreamFinished: {
-					const desktopFileId = text.trim();
-					root.getDefaultAppResult(targetMimeType, desktopFileId, callbackId);
-				}
-			}
-
-            stderr: StdioCollector {
-                onStreamFinished: {
-                    if (text.trim().length > 0) {
-                        log.error("DesktopService: xdg-mime query error:", text, "mime:", targetMimeType)
-                    }
-                }
-            }
-
-            onExited: (exitCode, exitStatus) => { destroy() }
-        }
+        });
    }

    function getDefaultApp(mimeType, callbackId = "") {
-        const proc = xdgGetDefaultApp.createObject(root, {
-            targetMimeType: mimeType,
-            callbackId: callbackId,
-            command: ["xdg-mime", "query", "default", mimeType],
-            running: true
-        })
-
-        if (!proc) {
-            log.warn("DesktopService: couldn't create process for", mimeType)
-        }
+        DMSService.sendRequest("mime.getDefault", {
+            "mimeType": mimeType
+        }, response => {
+            if (response.error) {
+                log.warn("DesktopService.getDefaultApp failed:", response.error, "mime:", mimeType);
+                return;
+            }
+            const result = response.result || {};
+            root.getDefaultAppResult(mimeType, result.desktopId || "", callbackId);
+        });
    }

-    signal getDefaultAppResult(string mimeType, string desktopFileId, string callbackId)
-
-
-
-    // Get apps that support a MIME type
-    Component {
-        id: gioGetAppsForMime
-
-        Process {
-            property string targetMimeType: ""
-            property string callbackId: ""
-
-			stdout: StdioCollector {
-				onStreamFinished: {
-					const lines = text.split("\n");
-					let appIds = [];
-					let seen = {};
-
-					for (let line of lines) {
-						const trimmed = line.trim();
-						if (
-							trimmed &&
-							trimmed.endsWith(".desktop") &&
-							!trimmed.startsWith("Default") &&
-							!trimmed.startsWith("default=")
-						) {
-							if (!seen[trimmed]) {
-								seen[trimmed] = true;
-								appIds.push(trimmed);
-							}
-						}
-					}
-					root.getAppsForMimeResult(targetMimeType, appIds, callbackId);
-				}
-			}
-
-			stderr: StdioCollector {
-				onStreamFinished: {
-					if (text.trim().length > 0) {
-						log.error("DesktopService: gio mime query error:", text, "command:", command, "mime:", targetMimeType);
-					}
-				}
-			}
-
-            onExited: (exitCode, exitStatus) => { destroy() }
-        }
+    function getAppsForMimeType(mimeType, callbackId = "") {
+        DMSService.sendRequest("mime.appsForMime", {
+            "mimeType": mimeType
+        }, response => {
+            if (response.error) {
+                log.warn("DesktopService.getAppsForMimeType failed:", response.error, "mime:", mimeType);
+                return;
+            }
+            const result = response.result || {};
+            root.getAppsForMimeResult(mimeType, result.desktopIds || [], callbackId);
+        });
    }
-
-	function getAppsForMimeType(mimeType, callbackId = "") {
-		const proc = gioGetAppsForMime.createObject(root, {
-			targetMimeType: mimeType,
-			callbackId: callbackId,
-			command: ["gio", "mime", mimeType],
-			running: true
-		});
-
-        if (!proc) {
-            log.warn("DesktopService: couldn't create process for", mimeType)
-        }
-    }
-
-    signal getAppsForMimeResult(string mimeType, var appIds, string callbackId)
 }