libsysprof-gtk: start on track discovery

src/libsysprof-gtk/sysprof-session.c

@@ -20,6 +20,8 @@
 
 #include "config.h"
 
+#include <glib/gi18n.h>
+
 #include "sysprof-session.h"
 #include "sysprof-track.h"
 #include "sysprof-value-axis.h"
@@ -72,19 +74,74 @@ sysprof_session_update_axis (SysprofSession *self)
                                     self->selected_time.end_nsec);
 }
 
+static SysprofDocumentCounter *
+sysprof_session_find_counter (SysprofSession *self,
+                              const char     *category,
+                              const char     *name)
+{
+  g_autoptr(GListModel) counters = NULL;
+  guint n_items;
+
+  g_assert (SYSPROF_IS_SESSION (self));
+  g_assert (category != NULL);
+  g_assert (name != NULL);
+
+  if (self->document == NULL)
+    return NULL;
+
+  counters = sysprof_document_list_counters (self->document);
+  n_items = g_list_model_get_n_items (counters);
+
+  for (guint i = 0; i < n_items; i++)
+    {
+      g_autoptr(SysprofDocumentCounter) counter = g_list_model_get_item (counters, i);
+
+      if (g_strcmp0 (category, sysprof_document_counter_get_category (counter)) == 0 &&
+          g_strcmp0 (name, sysprof_document_counter_get_name (counter)) == 0)
+        return g_steal_pointer (&counter);
+    }
+
+  return NULL;
+}
+
+static void
+sysprof_session_discover_tracks (SysprofSession *self)
+{
+  g_autoptr(SysprofDocumentCounter) cpu = NULL;
+
+  g_assert (SYSPROF_IS_SESSION (self));
+
+  if ((cpu = sysprof_session_find_counter (self, "CPU Percent", "Combined")))
+    {
+      g_autoptr(SysprofTrack) cpu_track = NULL;
+
+      cpu_track = g_object_new (SYSPROF_TYPE_TRACK,
+                                "title", _("CPU Usage"),
+                                NULL);
+      g_list_store_append (self->tracks, cpu_track);
+    }
+}
+
 static void
 sysprof_session_set_document (SysprofSession  *self,
                               SysprofDocument *document)
 {
+  const SysprofTimeSpan *time_span;
+
   g_assert (SYSPROF_IS_SESSION (self));
-  g_assert (SYSPROF_IS_DOCUMENT (document));
+  g_assert (!document || SYSPROF_IS_DOCUMENT (document));
 
-  g_set_object (&self->document, document);
+  if (!g_set_object (&self->document, document))
-
+    return;
-  self->visible_time = *sysprof_document_get_time_span (document);
-  self->selected_time = self->visible_time;
 
+  /* Select/show the entire document time span */
+  time_span = sysprof_document_get_time_span (document);
+  memcpy (&self->visible_time, time_span, sizeof *time_span);
+  memcpy (&self->selected_time, time_span, sizeof *time_span);
   sysprof_session_update_axis (self);
+
+  /* Discover tracks to show from the document */
+  sysprof_session_discover_tracks (self);
 }
 
 static void