Set tooltips on generic UI controls for LV2 plugin controls with documentation (rdfs...

[ardour.git] / libs / ardour / lv2_plugin.cc

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index dc312a099bfad68ec619340b87931d21fdd4b837..bd628e46bdc0551841f88fa739229f355385c70c 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -108,6 +108,7 @@ public:
        LilvNode* lv2_sampleRate;
        LilvNode* lv2_toggled;
        LilvNode* midi_MidiEvent;
+       LilvNode* rdfs_comment;
        LilvNode* ui_GtkUI;
        LilvNode* ui_external;
 };
@@ -583,6 +584,23 @@ LV2Plugin::get_parameter(uint32_t which) const
        return 0.0f;
 }
 
+std::string
+LV2Plugin::get_parameter_docs(uint32_t which) const
+{
+       LilvNodes* comments = lilv_port_get_value(
+               _impl->plugin,
+               lilv_plugin_get_port_by_index(_impl->plugin, which),
+               _world.rdfs_comment);
+
+       if (comments) {
+               const std::string docs(lilv_node_as_string(lilv_nodes_get_first(comments)));
+               lilv_nodes_free(comments);
+               return docs;
+       }
+
+       return "";
+}
+
 uint32_t
 LV2Plugin::nth_parameter(uint32_t n, bool& ok) const
 {
@@ -1466,6 +1484,7 @@ LV2World::LV2World()
        lv2_toggled        = lilv_new_uri(world, LILV_NS_LV2 "toggled");
        lv2_enumeration    = lilv_new_uri(world, LILV_NS_LV2 "enumeration");
        midi_MidiEvent     = lilv_new_uri(world, LILV_URI_MIDI_EVENT);
+       rdfs_comment       = lilv_new_uri(world, LILV_NS_RDFS "comment");
        ui_GtkUI           = lilv_new_uri(world, NS_UI "GtkUI");
        ui_external        = lilv_new_uri(world, NS_UI "external");
 }