libworkbench: implement GLogWriterFunc and library initialization

Add `Workbench.init()` to initialize resources and other setup tasks.

Currently, this only implements a `GLogWriterFunc` for silencing
specific messages that Workbench users shouldn't see.

This method has some limitations running on other threads in GJS,
and should be more performant in C anyways.

Author: andyholmes

src/init.js

@@ -12,6 +12,10 @@ import Adw from "gi://Adw";
 import Xdp from "gi://Xdp";
 import Source from "gi://GtkSource";
 import WebKit from "gi://WebKit";
+import Workbench from "gi://Workbench";
+
+
+Workbench.init();
 
 Gio._promisify(Adw.MessageDialog.prototype, "choose", "choose_finish");
 Gio._promisify(Xdp.Portal.prototype, "trash_file", "trash_file_finish");

src/libworkbench/meson.build

@@ -61,11 +61,13 @@ libworkbench_headers = files([
   'workbench.h',
   'workbench-completion-provider.h',
   'workbench-completion-request.h',
+  'workbench-utils.h',
 ])
 
 libworkbench_sources = files([
   'workbench-completion-provider.c',
   'workbench-completion-request.c',
+  'workbench-utils.c',
 ])
 
 install_headers(libworkbench_headers,

src/libworkbench/workbench-utils.c

@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: Workbench Contributors
+// SPDX-FileContributor: Andy Holmes <[email protected]>
+
+#include <glib.h>
+
+#include "workbench-utils.h"
+
+
+/*
+ * Silenced log messages
+ */
+struct
+{
+  const char     *log_domain;
+  GLogLevelFlags  log_level;
+  const char     *message;
+} ignored_messages[] = {
+    /* GDK4 */
+    {
+      "Gdk",
+      G_LOG_LEVEL_CRITICAL,
+      "gdk_scroll_event_get_direction: assertion 'GDK_IS_EVENT_TYPE (event, GDK_SCROLL)' failed",
+    },
+    {
+      "Gdk",
+      G_LOG_LEVEL_CRITICAL,
+      "gdk_scroll_event_get_direction: assertion 'GDK_IS_EVENT (event)' failed",
+    },
+
+    /* GTK4 */
+    {
+      "Gtk",
+      G_LOG_LEVEL_CRITICAL,
+      "Unable to connect to the accessibility bus at 'unix:path=/run/flatpak/at-spi-bus': Could not connect: No such file or directory",
+    },
+
+    /* Adwaita */
+    {
+      "Adwaita",
+      G_LOG_LEVEL_WARNING,
+      "Using GtkSettings:gtk-application-prefer-dark-theme with libadwaita is unsupported. Please use AdwStyleManager:color-scheme instead.",
+    },
+
+    /* GVFS */
+    {
+      "GVFS",
+      G_LOG_LEVEL_WARNING,
+      "The peer-to-peer connection failed: Error when getting information for file “/run/user/1000/gvfsd”: No such file or directory. Falling back to the session bus. Your application is probably missing --filesystem=xdg-run/gvfsd privileges.",
+    },
+};
+
+static inline gboolean
+workbench_log_ignore (const char     *log_domain,
+                      GLogLevelFlags  log_level,
+                      const char     *message)
+{
+  if G_UNLIKELY (log_domain == NULL || message == NULL)
+    return FALSE;
+
+  for (unsigned int i = 0; i < G_N_ELEMENTS (ignored_messages); i++)
+    {
+      if (ignored_messages[i].log_level == log_level &&
+          g_str_equal (ignored_messages[i].log_domain, log_domain) &&
+          g_str_equal (ignored_messages[i].message, message))
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
+static GLogWriterOutput
+workbench_log_writer (GLogLevelFlags   log_level,
+                      const GLogField *fields,
+                      gsize            n_fields,
+                      gpointer         user_data)
+{
+  const char *log_domain = NULL;
+  const char *message = NULL;
+
+  /* Respect default handling of log levels and domains */
+  if (g_log_writer_default_would_drop (log_level, log_domain))
+    return G_LOG_WRITER_HANDLED;
+
+  /* Silence specific messages */
+  for (gsize i = 0; i < n_fields; i++)
+    {
+      GLogField field = fields[i];
+
+      if (g_str_equal (field.key, "GLIB_DOMAIN"))
+        log_domain = field.value;
+      else if (g_str_equal (field.key, "MESSAGE"))
+        message = field.value;
+
+      if (log_domain != NULL && message != NULL)
+        break;
+    }
+
+  if (workbench_log_ignore (log_domain, log_level, message))
+    return G_LOG_WRITER_HANDLED;
+
+  return g_log_writer_standard_streams (log_level, fields, n_fields, user_data);
+}
+
+
+/**
+ * workbench_init:
+ *
+ * Initialize the internal library for Workbench.
+ */
+void
+workbench_init (void)
+{
+  gsize initialized = 0;
+
+  if (g_once_init_enter (&initialized))
+    {
+      g_log_set_writer_func (workbench_log_writer, NULL, NULL);
+      g_once_init_leave (&initialized, TRUE);
+    }
+}

src/libworkbench/workbench-utils.h

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: Workbench Contributors
+// SPDX-FileContributor: Andy Holmes <[email protected]>
+
+#pragma once
+
+#if !defined (WORKBENCH_INSIDE) && !defined (WORKBENCH_COMPILATION)
+# error "Only <workbench.h> can be included directly."
+#endif
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+WORKBENCH_EXPORT
+void   workbench_init (void);
+
+G_END_DECLS

src/libworkbench/workbench.h

@@ -10,6 +10,7 @@
 
 #include "workbench-completion-provider.h"
 #include "workbench-completion-request.h"
+#include "workbench-utils.h"
 
 #undef WORKBENCH_INSIDE
 

src/log_handler.js

@@ -1,5 +1,4 @@
 import "./init.js";
-import "./log_handler.js";
 import application from "./application.js";
 
 pkg.initGettext();