Add plugin to strip trailing spaces on save.

1 files changed, 214 insertions, 0 deletions

diff --git a/plugins/trailsave/pluma-trail-save-plugin.c b/plugins/trailsave/pluma-trail-save-plugin.c
new file mode 100644
index 00000000..dbc1621b
--- /dev/null
+++ b/plugins/trailsave/pluma-trail-save-plugin.c
@@ -0,0 +1,214 @@
+/*
+ * pluma-trail-save-plugin.c
+ *
+ * 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 2, 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $Id$
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pluma-trail-save-plugin.h"
+
+PLUMA_PLUGIN_REGISTER_TYPE(PlumaTrailSavePlugin, pluma_trail_save_plugin)
+
+static void
+strip_trailing_spaces (GtkTextBuffer *text_buffer)
+{
+	gint line_count, line_num;
+	GtkTextIter line_start, line_end;
+	gchar *slice;
+	gchar byte;
+	gint byte_index;
+	gint strip_start_index, strip_end_index;
+	gboolean should_strip;
+	GtkTextIter strip_start, strip_end;
+
+	g_assert (text_buffer != NULL);
+
+	line_count = gtk_text_buffer_get_line_count (text_buffer);
+
+	for (line_num = 0; line_num < line_count; ++line_num)
+	{
+		/* Get line text */
+		gtk_text_buffer_get_iter_at_line (text_buffer, &line_start, line_num);
+
+		if (line_num == line_count - 1)
+		{
+			gtk_text_buffer_get_end_iter (text_buffer, &line_end);
+		}
+		else
+		{
+			gtk_text_buffer_get_iter_at_line (text_buffer, &line_end, line_num + 1);
+		}
+
+		slice = gtk_text_buffer_get_slice (text_buffer, &line_start, &line_end, TRUE);
+
+		if (slice == NULL)
+		{
+			continue;
+		}
+
+		/* Find indices of bytes that should be stripped */
+		should_strip = FALSE;
+
+		for (byte_index = 0; slice [byte_index] != 0; ++byte_index)
+		{
+			byte = slice [byte_index];
+
+			if ((byte == ' ') || (byte == '\t'))
+			{
+				if (!should_strip)
+				{
+					strip_start_index = byte_index;
+					should_strip = TRUE;
+				}
+
+				strip_end_index = byte_index + 1;
+			}
+			else if ((byte == '\r') || (byte == '\n'))
+			{
+				break;
+			}
+			else
+			{
+				should_strip = FALSE;
+			}
+		}
+
+		g_free (slice);
+
+		/* Strip trailing spaces */
+		if (should_strip)
+		{
+			gtk_text_buffer_get_iter_at_line_index (text_buffer, &strip_start, line_num, strip_start_index);
+			gtk_text_buffer_get_iter_at_line_index (text_buffer, &strip_end, line_num, strip_end_index);
+			gtk_text_buffer_delete (text_buffer, &strip_start, &strip_end);
+		}
+	}
+}
+
+static void
+on_save (PlumaDocument         *document,
+	 const gchar           *uri,
+	 PlumaEncoding         *encoding,
+	 PlumaDocumentSaveFlags save_flags,
+	 PlumaPlugin           *plugin)
+{
+	GtkTextBuffer *text_buffer = GTK_TEXT_BUFFER (document);
+
+	strip_trailing_spaces (text_buffer);
+}
+
+static void
+on_tab_added (PlumaWindow *window,
+	      PlumaTab    *tab,
+	      PlumaPlugin *plugin)
+{
+	PlumaDocument *document;
+
+	document = pluma_tab_get_document (tab);
+	g_signal_connect (document, "save", G_CALLBACK (on_save), plugin);
+}
+
+static void
+on_tab_removed (PlumaWindow *window,
+		PlumaTab    *tab,
+		PlumaPlugin *plugin)
+{
+	PlumaDocument *document;
+
+	document = pluma_tab_get_document (tab);
+	g_signal_handlers_disconnect_by_data (document, plugin);
+}
+
+static void
+impl_activate (PlumaPlugin *plugin,
+	       PlumaWindow *window)
+{
+	GList *documents;
+	GList *documents_iter;
+	PlumaDocument *document;
+
+	pluma_debug (DEBUG_PLUGINS);
+
+	g_signal_connect (window, "tab_added", G_CALLBACK (on_tab_added), plugin);
+	g_signal_connect (window, "tab_removed", G_CALLBACK (on_tab_removed), plugin);
+
+	documents = pluma_window_get_documents (window);
+
+	for (documents_iter = documents;
+	     documents_iter && documents_iter->data;
+	     documents_iter = documents_iter->next)
+	{
+		document = (PlumaDocument *) documents_iter->data;
+		g_signal_connect (document, "save", G_CALLBACK (on_save), plugin);
+	}
+
+	g_list_free (documents);
+}
+
+static void
+impl_deactivate (PlumaPlugin *plugin,
+		 PlumaWindow *window)
+{
+	GList *documents;
+	GList *documents_iter;
+	PlumaDocument *document;
+
+	pluma_debug (DEBUG_PLUGINS);
+
+	g_signal_handlers_disconnect_by_data (window, plugin);
+
+	documents = pluma_window_get_documents (window);
+
+	for (documents_iter = documents;
+	     documents_iter && documents_iter->data;
+	     documents_iter = documents_iter->next)
+	{
+		document = (PlumaDocument *) documents_iter->data;
+		g_signal_handlers_disconnect_by_data (document, plugin);
+	}
+
+	g_list_free (documents);
+}
+
+static void
+pluma_trail_save_plugin_init (PlumaTrailSavePlugin *plugin)
+{
+	pluma_debug_message (DEBUG_PLUGINS, "PlumaTrailSavePlugin initializing");
+}
+
+static void
+pluma_trail_save_plugin_finalize (GObject *object)
+{
+	pluma_debug_message (DEBUG_PLUGINS, "PlumaTrailSavePlugin finalizing");
+
+	G_OBJECT_CLASS (pluma_trail_save_plugin_parent_class)->finalize (object);
+}
+
+static void
+pluma_trail_save_plugin_class_init (PlumaTrailSavePluginClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+	PlumaPluginClass *plugin_class = PLUMA_PLUGIN_CLASS (klass);
+
+	object_class->finalize = pluma_trail_save_plugin_finalize;
+
+	plugin_class->activate = impl_activate;
+	plugin_class->deactivate = impl_deactivate;
+}