[gnome-builder] sourceview: add ctrl+shift+space to show references to symbol

[Christian Hergert <chergert src gnome org>]

commit 3abfd86841734a2a902ba0d17278f326231e7992
Author: Christian Hergert <chergert redhat com>
Date:   Fri Mar 31 01:27:46 2017 -0600

    sourceview: add ctrl+shift+space to show references to symbol
    
    This currently only works with Rust, as it is the only IdeSymbolResolver
    that implements this vfunc. It should not be terribly difficult to
    implement it for clang, but would be limited to files that have been
    parsed and units loaded.
    
    Realistically for other languages such as clang, we'll want a code index
    to provide this stuff w/ background indexing.
    
    We still need to make it easy to allow you to jump to the location, provide
    project path relative filenames, and background load the symbol that is
    found at that scope so that we can provide better labels.

 libide/sourceview/ide-source-view.c |  144 +++++++++++++++++++++++++++++++++++
 1 files changed, 144 insertions(+), 0 deletions(-)
---
diff --git a/libide/sourceview/ide-source-view.c b/libide/sourceview/ide-source-view.c
index 481218d..2967316 100644
--- a/libide/sourceview/ide-source-view.c
+++ b/libide/sourceview/ide-source-view.c
@@ -64,6 +64,7 @@
 #include "sourceview/ide-source-view.h"
 #include "sourceview/ide-text-util.h"
 #include "symbols/ide-symbol.h"
+#include "symbols/ide-symbol-resolver.h"
 #include "theatrics/ide-box-theatric.h"
 #include "util/ide-cairo.h"
 #include "util/ide-gdk.h"
@@ -271,6 +272,7 @@ enum {
   END_USER_ACTION,
   FOCUS_LOCATION,
   FORMAT_SELECTION,
+  FIND_REFERENCES,
   GOTO_DEFINITION,
   HIDE_COMPLETION,
   INCREASE_FONT_SIZE,
@@ -5962,6 +5964,135 @@ ide_source_view_real_format_selection (IdeSourceView *self)
 }
 
 static void
+ide_source_view_find_references_cb (GObject      *object,
+                                    GAsyncResult *result,
+                                    gpointer      user_data)
+{
+  IdeSymbolResolver *resolver = (IdeSymbolResolver *)object;
+  g_autoptr(IdeSourceView) self = user_data;
+  IdeSourceViewPrivate *priv = ide_source_view_get_instance_private (self);
+  g_autoptr(GPtrArray) references = NULL;
+  g_autoptr(GError) error = NULL;
+  GtkScrolledWindow *scroller;
+  GtkPopover *popover;
+  GtkListBox *list_box;
+  GtkTextMark *insert;
+  GtkTextIter iter;
+  GdkRectangle loc;
+
+  IDE_ENTRY;
+
+  g_assert (IDE_IS_SYMBOL_RESOLVER (resolver));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (IDE_IS_SOURCE_VIEW (self));
+
+  references = ide_symbol_resolver_find_references_finish (resolver, result, &error);
+
+  if (error != NULL)
+    g_debug ("%s", error->message);
+
+  /* Ignore popover if we are no longer visible or not top-most */
+  if (!gtk_widget_get_visible (GTK_WIDGET (self)) ||
+      !gtk_widget_get_child_visible (GTK_WIDGET (self)))
+    IDE_EXIT;
+
+  insert = gtk_text_buffer_get_insert (GTK_TEXT_BUFFER (priv->buffer));
+  gtk_text_buffer_get_iter_at_mark (GTK_TEXT_BUFFER (priv->buffer), &iter, insert);
+  gtk_text_buffer_select_range (GTK_TEXT_BUFFER (priv->buffer), &iter, &iter);
+  gtk_text_view_get_iter_location (GTK_TEXT_VIEW (self), &iter, &loc);
+  gtk_text_view_buffer_to_window_coords (GTK_TEXT_VIEW (self),
+                                         GTK_TEXT_WINDOW_WIDGET,
+                                         loc.x, loc.y, &loc.x, &loc.y);
+
+  popover = g_object_new (GTK_TYPE_POPOVER,
+                          "modal", TRUE,
+                          "position", GTK_POS_TOP,
+                          "relative-to", self,
+                          "pointing-to", &loc,
+                          NULL);
+
+  scroller = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
+                           "min-content-height", 35,
+                           "max-content-height", 200,
+                           "propagate-natural-height", TRUE,
+                           "propagate-natural-width", TRUE,
+                           "visible", TRUE,
+                           NULL);
+  gtk_container_add (GTK_CONTAINER (popover), GTK_WIDGET (scroller));
+
+  list_box = g_object_new (GTK_TYPE_LIST_BOX,
+                           "visible", TRUE,
+                           NULL);
+  gtk_container_add (GTK_CONTAINER (scroller), GTK_WIDGET (list_box));
+
+  if (references != NULL && references->len > 0)
+    {
+      for (guint i = 0; i < references->len; i++)
+        {
+          IdeSourceRange *range = g_ptr_array_index (references, i);
+          IdeSourceLocation *begin = ide_source_range_get_begin (range);
+          IdeFile *file = ide_source_location_get_file (begin);
+          guint line = ide_source_location_get_line (begin);
+          guint line_offset = ide_source_location_get_line_offset (begin);
+          g_autofree gchar *name = g_file_get_basename (ide_file_get_file (file));
+          g_autofree gchar *text = g_strdup_printf ("%s %u:%u", name, line+1, line_offset+1);
+          GtkLabel *label;
+
+          label = g_object_new (GTK_TYPE_LABEL,
+                                "xalign", 0.0f,
+                                "label", text,
+                                "visible", TRUE,
+                                NULL);
+          gtk_container_add (GTK_CONTAINER (list_box), GTK_WIDGET (label));
+        }
+    }
+  else
+    {
+      GtkLabel *label = g_object_new (GTK_TYPE_LABEL,
+                                      "label", _("No references were found"),
+                                      "visible", TRUE,
+                                      NULL);
+      gtk_container_add (GTK_CONTAINER (list_box), GTK_WIDGET (label));
+    }
+
+  gtk_popover_popup (popover);
+
+  g_signal_connect (popover, "hide", G_CALLBACK (gtk_widget_destroy), NULL);
+
+  IDE_EXIT;
+}
+
+static void
+ide_source_view_real_find_references (IdeSourceView *self)
+{
+  IdeSourceViewPrivate *priv = ide_source_view_get_instance_private (self);
+  g_autoptr(IdeSourceLocation) location = NULL;
+  IdeSymbolResolver *resolver;
+
+  IDE_ENTRY;
+
+  g_assert (IDE_IS_SOURCE_VIEW (self));
+
+  resolver = ide_buffer_get_symbol_resolver (priv->buffer);
+
+  if (resolver == NULL)
+    {
+      g_debug ("No symbol resolver is available");
+      IDE_EXIT;
+    }
+
+  location = ide_buffer_get_insert_location (priv->buffer);
+
+  ide_symbol_resolver_find_references_async (resolver,
+                                             location,
+                                             NULL,
+                                             ide_source_view_find_references_cb,
+                                             g_object_ref (self));
+
+  IDE_EXIT;
+}
+
+static void
 ide_source_view_dispose (GObject *object)
 {
   IdeSourceView *self = (IdeSourceView *)object;
@@ -6712,6 +6843,13 @@ ide_source_view_class_init (IdeSourceViewClass *klass)
                                 G_TYPE_NONE,
                                 0);
 
+  signals [FIND_REFERENCES] =
+    g_signal_new_class_handler ("find-references",
+                                G_TYPE_FROM_CLASS (klass),
+                                G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+                                G_CALLBACK (ide_source_view_real_find_references),
+                                NULL, NULL, NULL, G_TYPE_NONE, 0);
+
   signals [FOCUS_LOCATION] =
     g_signal_new ("focus-location",
                   G_TYPE_FROM_CLASS (klass),
@@ -7102,11 +7240,17 @@ ide_source_view_class_init (IdeSourceViewClass *klass)
                   0);
 
   binding_set = gtk_binding_set_by_class (klass);
+
   gtk_binding_entry_add_signal (binding_set,
                                 GDK_KEY_r,
                                 GDK_CONTROL_MASK | GDK_SHIFT_MASK,
                                 "begin-rename", 0);
 
+  gtk_binding_entry_add_signal (binding_set,
+                                GDK_KEY_space,
+                                GDK_CONTROL_MASK | GDK_SHIFT_MASK,
+                                "find-references", 0);
+
   /*
    * Escape is wired up by the GtkSourceCompletion by default. However, some
    * keybindings may want to control that manually (such as Vim). Vim needs to