[gnome-builder/wip/libide] libide: reduce diagnostician calls under certain battery scenarios

[Christian Hergert <chergert src gnome org>]

commit ba73c6793fd7ea7ce06feed7711a80a3ec962ff1
Author: Christian Hergert <christian hergert me>
Date:   Tue Mar 10 16:41:33 2015 -0700

    libide: reduce diagnostician calls under certain battery scenarios
    
    If we are less than 50% of battery (and running off of the battery), then
    attempt to conserve power by reducing how often we generate translation
    units for diagnostics.
    
    We will likely want to play with the thresholds a bit.

 libide/ide-buffer.c |   26 ++++++++++++++++++++++----
 1 files changed, 22 insertions(+), 4 deletions(-)
---
diff --git a/libide/ide-buffer.c b/libide/ide-buffer.c
index 7ea0bba..c435d25 100644
--- a/libide/ide-buffer.c
+++ b/libide/ide-buffer.c
@@ -20,6 +20,7 @@
 
 #include <glib/gi18n.h>
 
+#include "ide-battery-monitor.h"
 #include "ide-buffer.h"
 #include "ide-buffer-change-monitor.h"
 #include "ide-context.h"
@@ -34,7 +35,8 @@
 #include "ide-unsaved-files.h"
 #include "ide-vcs.h"
 
-#define DEFAULT_DIAGNOSE_TIMEOUT_MSEC 333
+#define DEFAULT_DIAGNOSE_TIMEOUT_MSEC          333
+#define DEFAULT_DIAGNOSE_CONSERVE_TIMEOUT_MSEC 5000
 
 #define TAG_ERROR   "diagnostician::error"
 #define TAG_WARNING "diagnostician::warning"
@@ -417,9 +419,22 @@ ide_buffer__diagnose_timeout_cb (gpointer user_data)
   return G_SOURCE_REMOVE;
 }
 
+static guint
+ide_buffer_get_diagnose_timeout_msec (void)
+{
+  guint timeout_msec = DEFAULT_DIAGNOSE_TIMEOUT_MSEC;
+
+  if (ide_battery_monitor_get_should_conserve ())
+    timeout_msec = DEFAULT_DIAGNOSE_CONSERVE_TIMEOUT_MSEC;
+
+  return timeout_msec;
+}
+
 static void
 ide_buffer_queue_diagnose (IdeBuffer *self)
 {
+  guint timeout_msec;
+
   g_assert (IDE_IS_BUFFER (self));
 
   self->diagnostics_dirty = TRUE;
@@ -430,9 +445,12 @@ ide_buffer_queue_diagnose (IdeBuffer *self)
       self->diagnose_timeout = 0;
     }
 
-  self->diagnose_timeout = g_timeout_add (DEFAULT_DIAGNOSE_TIMEOUT_MSEC,
-                                          ide_buffer__diagnose_timeout_cb,
-                                          self);
+  /*
+   * Try to real in how often we parse when on battery.
+   */
+  timeout_msec = ide_buffer_get_diagnose_timeout_msec ();
+
+  self->diagnose_timeout = g_timeout_add (timeout_msec, ide_buffer__diagnose_timeout_cb, self);
 }
 
 static void