[gnome-builder] app: load offline docs if we don't have internet

[Christian Hergert <chergert src gnome org>]

commit 19d34408c85a058c8b83cac8fa109177ddddb666
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 9 00:18:39 2017 -0800

    app: load offline docs if we don't have internet
    
    We want to default to online docs as they will be the most up to date.
    If we don't have that, we'll load from docdir (or translate to the host
    if we are accessing via flatpak).

 libide/Makefile.am                           |    1 +
 libide/application/ide-application-actions.c |   31 +++++++++++++++++++------
 2 files changed, 24 insertions(+), 8 deletions(-)
---
diff --git a/libide/Makefile.am b/libide/Makefile.am
index 23e5665..845d4be 100644
--- a/libide/Makefile.am
+++ b/libide/Makefile.am
@@ -543,6 +543,7 @@ libide_1_0_la_SOURCES =                                                     \
 libide_1_0_la_includes =                                                    \
        $(DEBUG_CFLAGS)                                                     \
        -DPACKAGE_DATADIR="\"${datadir}\""                                  \
+       -DPACKAGE_DOCDIR="\"${docdir}\""                                    \
        -DPACKAGE_LOCALE_DIR=\""${datadir}/locale"\"                        \
        -DPACKAGE_LIBDIR=\""${libdir}"\"                                    \
        -DPACKAGE_LIBEXECDIR=\""${libexecdir}"\"                            \
diff --git a/libide/application/ide-application-actions.c b/libide/application/ide-application-actions.c
index fab7d51..1abdaa0 100644
--- a/libide/application/ide-application-actions.c
+++ b/libide/application/ide-application-actions.c
@@ -31,6 +31,7 @@
 #include "keybindings/ide-shortcuts-window.h"
 #include "workbench/ide-workbench.h"
 #include "greeter/ide-greeter-perspective.h"
+#include "util/ide-flatpak.h"
 
 static void
 ide_application_actions_preferences (GSimpleAction *action,
@@ -153,21 +154,35 @@ ide_application_actions_help (GSimpleAction *action,
 {
   IdeApplication *self = user_data;
   GtkWindow *focused_window= NULL;
-  GError *err = NULL;
+  const gchar *uri = "https://builder.readthedocs.io";;
+  g_autoptr(GError) error = NULL;
+  GNetworkMonitor *monitor;
+  g_autofree gchar *real_uri = NULL;
 
   g_assert (IDE_IS_APPLICATION (self));
 
   focused_window = gtk_application_get_active_window (GTK_APPLICATION (self));
 
-  gtk_show_uri_on_window (focused_window,
-                          "https://builder.readthedocs.io";,
-                          gtk_get_current_event_time (),
-                          &err);
-  if (err)
+  monitor = g_network_monitor_get_default ();
+
+  /*
+   * If we don't have network access, we should try to use the local
+   * documentation. To do that we might need to translate it to the
+   * path for which the host has access.
+   */
+  if (!g_network_monitor_get_network_available (monitor))
     {
-      g_message ("Unable to open help: %s\n", err->message);
-      g_error_free (err);
+      if (g_file_test (PACKAGE_DOCDIR"/html/index.html", G_FILE_TEST_IS_REGULAR))
+        {
+          if (ide_is_flatpak ())
+            uri = real_uri = ide_flatpak_get_app_path ("/share/doc/gnome-builder/html/index.html");
+          else
+            uri = "file://"PACKAGE_DOCDIR"/html/index.html";
+        }
     }
+
+  if (!gtk_show_uri_on_window (focused_window, uri, gtk_get_current_event_time (), &error))
+    g_message ("Unable to open help: %s\n", error->message);
 }
 
 static void