add queue filter function

UI tweaks

internal/config/model.go

@@ -21,7 +21,7 @@ import (
 	"sort"
 )
 
-// MPD's track attribute identifiers
+// MPD's track attribute identifiers. These must precisely match the queueListStore's columns declared in player.glade
 const (
 	MTAttrArtist = iota
 	MTAttrArtistSort
@@ -46,6 +46,10 @@ const (
 	MTAttrGrouping
 	MTAttrComment
 	MTAttrLabel
+	// List store's "artificial" columns used for rendering
+	QueueColumnFontWeight
+	QueueColumnBgColor
+	QueueColumnVisible
 )
 
 // MpdTrackAttribute describes an MPD's track attribute

internal/player/builder.go

@@ -137,6 +137,15 @@ func (b *Builder) getListBox(name string) *gtk.ListBox {
 	return result
 }
 
+// getListStore finds and returns a list box by its name
+func (b *Builder) getListStore(name string) *gtk.ListStore {
+	result, ok := b.get(name).(*gtk.ListStore)
+	if !ok {
+		log.Fatal(errors.Errorf("%v is not a gtk.ListStore", name))
+	}
+	return result
+}
+
 // getMenu finds and returns a menu by its name
 func (b *Builder) getMenu(name string) *gtk.Menu {
 	result, ok := b.get(name).(*gtk.Menu)
@@ -173,6 +182,24 @@ func (b *Builder) getScale(name string) *gtk.Scale {
 	return result
 }
 
+// getSearchBar finds and returns a search bar by its name
+func (b *Builder) getSearchBar(name string) *gtk.SearchBar {
+	result, ok := b.get(name).(*gtk.SearchBar)
+	if !ok {
+		log.Fatal(errors.Errorf("%v is not a gtk.SearchBar", name))
+	}
+	return result
+}
+
+// getSearchEntry finds and returns a search entry by its name
+func (b *Builder) getSearchEntry(name string) *gtk.SearchEntry {
+	result, ok := b.get(name).(*gtk.SearchEntry)
+	if !ok {
+		log.Fatal(errors.Errorf("%v is not a gtk.SearchEntry", name))
+	}
+	return result
+}
+
 // getShortcutsWindow finds and returns a shortcuts window by its name
 func (b *Builder) getShortcutsWindow(name string) *gtk.ShortcutsWindow {
 	result, ok := b.get(name).(*gtk.ShortcutsWindow)
@@ -227,6 +254,15 @@ func (b *Builder) getToolButton(name string) *gtk.ToolButton {
 	return result
 }
 
+// getTreeModelFilter finds and returns a tree model filter by its name
+func (b *Builder) getTreeModelFilter(name string) *gtk.TreeModelFilter {
+	result, ok := b.get(name).(*gtk.TreeModelFilter)
+	if !ok {
+		log.Fatal(errors.Errorf("%v is not a gtk.TreeModelFilter", name))
+	}
+	return result
+}
+
 // getTreeView finds and returns a tree view by its name
 func (b *Builder) getTreeView(name string) *gtk.TreeView {
 	result, ok := b.get(name).(*gtk.TreeView)