[gnome-builder/editor-layout] add helper for tracking unsaved buffer id

[Christian Hergert <chergert src gnome org>]

commit 3c050380b26fbdec35bd31c68cff63b4a3f6a817
Author: Christian Hergert <christian hergert me>
Date:   Sun Nov 30 04:13:59 2014 -0800

    add helper for tracking unsaved buffer id
    
    this is useful for naming files like "untitled 1".

 src/gnome-builder.mk  |    2 +
 src/util/gb-doc-seq.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/gb-doc-seq.h |   31 +++++++++++++++++++++++++++++
 3 files changed, 84 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-builder.mk b/src/gnome-builder.mk
index 46a844b..ac25a06 100644
--- a/src/gnome-builder.mk
+++ b/src/gnome-builder.mk
@@ -164,6 +164,8 @@ src/tabs/gb-tab-stack.h \
        src/trie/trie.h \
        src/util/gb-cairo.c \
        src/util/gb-cairo.h \
+       src/util/gb-doc-seq.c \
+       src/util/gb-doc-seq.h \
        src/util/gb-gtk.c \
        src/util/gb-gtk.h \
        src/util/gb-rgba.c \
diff --git a/src/util/gb-doc-seq.c b/src/util/gb-doc-seq.c
new file mode 100644
index 0000000..e92582f
--- /dev/null
+++ b/src/util/gb-doc-seq.c
@@ -0,0 +1,51 @@
+/* gb-doc-seq.c
+ *
+ * Copyright (C) 2014 Christian Hergert <christian hergert me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "gb-doc-seq.h"
+
+static GHashTable *seq;
+
+guint
+gb_doc_seq_acquire (void)
+{
+  guint seq_id;
+
+  if (!seq)
+    seq = g_hash_table_new (g_direct_hash, g_direct_equal);
+
+  for (seq_id = 1; seq_id < G_MAXUINT; seq_id++)
+    {
+      gpointer key;
+
+      key = GINT_TO_POINTER (seq_id);
+
+      if (!g_hash_table_lookup (seq, key))
+        {
+          g_hash_table_insert (seq, key, GINT_TO_POINTER (TRUE));
+          return seq_id;
+        }
+    }
+
+  return 0;
+}
+
+void
+gb_doc_seq_release (guint seq_id)
+{
+  g_hash_table_remove (seq, GINT_TO_POINTER (seq_id));
+}
diff --git a/src/util/gb-doc-seq.h b/src/util/gb-doc-seq.h
new file mode 100644
index 0000000..23ca57e
--- /dev/null
+++ b/src/util/gb-doc-seq.h
@@ -0,0 +1,31 @@
+/* gb-doc-seq.h
+ *
+ * Copyright (C) 2014 Christian Hergert <christian hergert me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GB_DOC_SEQ_H
+#define GB_DOC_SEQ_H
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+guint gb_doc_seq_acquire (void);
+void  gb_doc_seq_release (guint seq_id);
+
+G_END_DECLS
+
+#endif /* GB_DOC_SEQ_H */