diff --git a/data/Todo.pc.in b/data/Todo.pc.in
new file mode 100644
index 0000000..df0faa8
--- /dev/null
+++ b/data/Todo.pc.in
@@ -0,0 +1,11 @@
+prefix=@PREFIX@
+includedir=${prefix}/include
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+
+Name: Todo
+Description: DeforaOS Desktop Todo library
+Version: @VERSION@
+Requires: libDesktop
+Cflags: -I${includedir}
+Libs: -L${libdir} @RPATH@ -lTodo
diff --git a/data/pkgconfig.sh b/data/pkgconfig.sh
new file mode 100755
index 0000000..bbb503e
--- /dev/null
+++ b/data/pkgconfig.sh
@@ -0,0 +1,198 @@
+#!/bin/sh
+#$Id$
+#Copyright (c) 2011-2022 Pierre Pronchery <khorben@defora.org>
+#
+#Redistribution and use in source and binary forms, with or without
+#modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+#
+#THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+#DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+#FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+#DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+#SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+#CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+#OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+
+#variables
+CONFIGSH="${0%/pkgconfig.sh}/../config.sh"
+PREFIX="/usr/local"
+DEVNULL="/dev/null"
+PROGNAME="pkgconfig.sh"
+#executables
+DEBUG="_debug"
+INSTALL="install"
+MKDIR="mkdir -m 0755 -p"
+RM="rm -f"
+SED="sed"
+
+[ -f "$CONFIGSH" ] && . "$CONFIGSH"
+
+
+#functions
+#pkgconfig
+_pkgconfig()
+{
+	#check the variables
+	if [ -z "$PACKAGE" ]; then
+		_error "The PACKAGE variable needs to be set"
+		return $?
+	fi
+	if [ -z "$VERSION" ]; then
+		_error "The VERSION variable needs to be set"
+		return $?
+	fi
+	[ -z "$BINDIR" ] && BINDIR="$PREFIX/bin"
+	[ -z "$DATADIR" ] && DATADIR="$PREFIX/share"
+	[ -z "$INCLUDEDIR" ] && INCLUDEDIR="$PREFIX/include"
+	[ -z "$LIBDIR" ] && LIBDIR="$PREFIX/lib"
+	[ -z "$LIBEXECDIR" ] && LIBEXECDIR="$PREFIX/libexec"
+	[ -z "$MANDIR" ] && MANDIR="$DATADIR/man"
+	[ -z "$SBINDIR" ] && SBINDIR="$PREFIX/sbin"
+	if [ -z "$SYSCONFDIR" ]; then
+		SYSCONFDIR="$PREFIX/etc"
+		[ "$PREFIX" = "/usr" ] && SYSCONFDIR="/etc"
+	fi
+	PKGCONFIG="$PREFIX/lib/pkgconfig"
+
+	while [ $# -gt 0 ]; do
+		target="$1"
+		shift
+
+		#clean
+		[ "$clean" -ne 0 ] && continue
+
+		#uninstall
+		if [ "$uninstall" -eq 1 ]; then
+			$DEBUG $RM -- "$PKGCONFIG/$target"	|| return 2
+			continue
+		fi
+
+		#install
+		if [ "$install" -eq 1 ]; then
+			source="${target#$OBJDIR}"
+			$DEBUG $MKDIR -- "$PKGCONFIG"		|| return 2
+			mode="-m 0644"
+			basename="$source"
+			if [ "${source##*/}" != "$source" ]; then
+				basename="${source##*/}"
+			fi
+			$DEBUG $INSTALL $mode "$target" "$PKGCONFIG/$basename" \
+								|| return 2
+			continue
+		fi
+
+		#portability
+		RPATH=
+		if [ "$PREFIX" != "/usr" ]; then
+			RPATH="-Wl,-rpath-link,\${libdir} -Wl,-rpath,\${libdir}"
+			case $(uname -s) in
+				"Darwin")
+					RPATH="-Wl,-rpath,\${libdir}"
+					;;
+				"SunOS")
+					RPATH="-Wl,-R\${libdir}"
+					;;
+			esac
+		fi
+
+		#create
+		source="${target#$OBJDIR}"
+		source="${source}.in"
+		([ -z "$OBJDIR" ] || $DEBUG $MKDIR -- "${target%/*}") \
+								|| return 2
+		$DEBUG $SED -e "s;@VENDOR@;$VENDOR;g" \
+			-e "s;@PACKAGE@;$PACKAGE;g" \
+			-e "s;@VERSION@;$VERSION;g" \
+			-e "s;@PREFIX@;$PREFIX;g" \
+			-e "s;@BINDIR@;$BINDIR;g" \
+			-e "s;@DATADIR@;$DATADIR;g" \
+			-e "s;@INCLUDEDIR@;$INCLUDEDIR;g" \
+			-e "s;@LIBDIR@;$LIBDIR;g" \
+			-e "s;@LIBEXECDIR@;$LIBEXECDIR;g" \
+			-e "s;@MANDIR@;$MANDIR;g" \
+			-e "s;@PWD@;$PWD;g" \
+			-e "s;@RPATH@;$RPATH;g" \
+			-e "s;@SBINDIR@;$SBINDIR;g" \
+			-e "s;@SYSCONFDIR@;$SYSCONFDIR;g" \
+			-- "$source" > "$target"
+		if [ $? -ne 0 ]; then
+			$RM -- "$target" 2> "$DEVNULL"
+			return 2
+		fi
+	done
+	return 0
+}
+
+
+#debug
+_debug()
+{
+	echo "$@" 1>&3
+	"$@"
+}
+
+
+#error
+_error()
+{
+	echo "$PROGNAME: $@" 1>&2
+	return 2
+}
+
+
+#usage
+_usage()
+{
+	echo "Usage: $PROGNAME [-c|-i|-u][-P prefix] target..." 1>&2
+	return 1
+}
+
+
+#main
+clean=0
+install=0
+uninstall=0
+while getopts "ciuO:P:" name; do
+	case $name in
+		c)
+			clean=1
+			;;
+		i)
+			uninstall=0
+			install=1
+			;;
+		u)
+			install=0
+			uninstall=1
+			;;
+		O)
+			export "${OPTARG%%=*}"="${OPTARG#*=}"
+			;;
+		P)
+			PREFIX="$OPTARG"
+			;;
+		?)
+			_usage
+			exit $?
+			;;
+	esac
+done
+shift $(($OPTIND - 1))
+if [ $# -lt 1 ]; then
+	_usage
+	exit $?
+fi
+
+exec 3>&1
+_pkgconfig "$@"
diff --git a/data/project.conf b/data/project.conf
index e0b1862..816192a 100644
--- a/data/project.conf
+++ b/data/project.conf
@@ -1,5 +1,13 @@
 subdirs=16x16,24x24,48x48
-dist=Makefile,org.defora.todo.desktop
+targets=Todo.pc
+dist=Makefile,Todo.pc.in,org.defora.todo.desktop,pkgconfig.sh
+
+#targets
+[Todo.pc]
+type=script
+script=./pkgconfig.sh
+depends=Todo.pc.in,../config.sh
+install=
 
 #dist
 [org.defora.todo.desktop]
diff --git a/include/Todo.h b/include/Todo.h
new file mode 100644
index 0000000..3b205d3
--- /dev/null
+++ b/include/Todo.h
@@ -0,0 +1,94 @@
+/* $Id$ */
+/* Copyright (c) 2009-2024 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS Desktop Todo */
+/* All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+
+
+#ifndef DESKTOP_TODO_H
+# define DESKTOP_TODO_H
+
+# include <gtk/gtk.h>
+
+
+/* Todo */
+/* types */
+typedef struct _Todo Todo;
+
+typedef enum _TodoColumn
+{
+	TD_COL_TASK,
+	TD_COL_DONE,
+	TD_COL_TITLE,
+	TD_COL_START,
+	TD_COL_DISPLAY_START,
+	TD_COL_END,
+	TD_COL_DISPLAY_END,
+	TD_COL_PRIORITY,
+	TD_COL_DISPLAY_PRIORITY,
+	TD_COL_CATEGORY
+} TodoColumn;
+#define TD_COL_LAST TD_COL_CATEGORY
+#define TD_COL_COUNT (TD_COL_LAST + 1)
+
+typedef enum _TodoFilter
+{
+	TODO_FILTER_ALL_TASKS = 0,
+	TODO_FILTER_COMPLETED_TASKS,
+	TODO_FILTER_REMAINING_TASKS
+} TodoFilter;
+# define TODO_FILTER_LAST TODO_FILTER_REMAINING_TASKS
+# define TODO_FILTER_COUNT (TODO_FILTER_LAST + 1)
+
+typedef enum _TodoPriority
+{
+	TODO_PRIORITY_UNKNOWN = 0,
+	TODO_PRIORITY_LOW,
+	TODO_PRIORITY_MEDIUM,
+	TODO_PRIORITY_HIGH,
+	TODO_PRIORITY_URGENT
+} TodoPriority;
+
+
+/* functions */
+Todo * todo_new(GtkWidget * window, GtkAccelGroup * group);
+void todo_delete(Todo * todo);
+
+/* accessors */
+unsigned int todo_get_filter(Todo * todo);
+GtkWidget * todo_get_view(Todo * todo);
+GtkTreeViewColumn * todo_get_view_column(Todo * todo, unsigned i);
+GtkWidget * todo_get_widget(Todo * todo);
+
+void todo_set_filter(Todo * todo, unsigned int filter);
+
+/* useful */
+void todo_about(Todo * todo);
+int todo_error(Todo * todo, char const * message, int ret);
+
+void todo_show_preferences(Todo * todo, gboolean show);
+
+#endif /* !DESKTOP_TODO_H */
diff --git a/include/project.conf b/include/project.conf
new file mode 100644
index 0000000..f217709
--- /dev/null
+++ b/include/project.conf
@@ -0,0 +1,6 @@
+includes=Todo.h
+dist=Makefile
+
+#includes
+[Todo.h]
+install=$(INCLUDEDIR)/Desktop
diff --git a/project.conf b/project.conf
index 3bcf5a3..46a7579 100644
--- a/project.conf
+++ b/project.conf
@@ -2,7 +2,7 @@ package=Todo
 version=0.3.0
 config=h,sh
 
-subdirs=data,doc,po,src,tools,tests
+subdirs=data,doc,include,po,src,tools,tests
 targets=tests
 dist=Makefile,COPYING,config.h,config.sh
 
diff --git a/src/project.conf b/src/project.conf
index e2237e9..37df3a3 100644
--- a/src/project.conf
+++ b/src/project.conf
@@ -1,15 +1,25 @@
-targets=todo
+targets=libTodo,todo
+cppflags_force=-I../include
 #cppflags=-D EMBEDDED
 cflags_force=`pkg-config --cflags libDesktop`
-cflags=-W -Wall -g -O2 -fPIE -D_FORTIFY_SOURCE=2 -fstack-protector
+cflags=-W -Wall -g -O2 -D_FORTIFY_SOURCE=2 -fstack-protector
 ldflags_force=`pkg-config --libs libDesktop` -lintl
 ldflags=-pie -Wl,-z,relro -Wl,-z,now
 dist=Makefile,priority.h,task.h,taskedit.h,todo.h,window.h
 
 #targets
+[libTodo]
+type=library
+sources=priority.c,task.c,taskedit.c,todo.c,window.c
+cflags=-fPIC
+install=$(LIBDIR)
+
 [todo]
 type=binary
-sources=priority.c,task.c,taskedit.c,todo.c,window.c,main.c
+sources=main.c
+depends=libTodo$(SOEXT)
+cflags=-fPIE
+ldflags=-L. -Wl,-rpath,$(LIBDIR) -lTodo
 install=$(BINDIR)
 
 #sources
@@ -21,15 +31,12 @@ depends=todo.h,priority.h
 
 [task.c]
 depends=task.h
-cflags=-fPIC
 
 [taskedit.c]
 depends=priority.h
-cflags=-fPIC
 
 [todo.c]
 depends=priority.h,task.h,todo.h,../config.h
-cflags=-fPIC
 
 [window.c]
 depends=todo.h,window.h
diff --git a/src/todo.c b/src/todo.c
index f308c81..a88fd5d 100644
--- a/src/todo.c
+++ b/src/todo.c
@@ -59,12 +59,6 @@ static char const _license[] = "All rights reserved.\n"
 /* Todo */
 /* private */
 /* types */
-typedef enum _TodoColumn { TD_COL_TASK, TD_COL_DONE, TD_COL_TITLE, TD_COL_START,
-	TD_COL_DISPLAY_START, TD_COL_END, TD_COL_DISPLAY_END, TD_COL_PRIORITY,
-	TD_COL_DISPLAY_PRIORITY, TD_COL_CATEGORY } TodoColumn;
-#define TD_COL_LAST TD_COL_CATEGORY
-#define TD_COL_COUNT (TD_COL_LAST + 1)
-
 struct _Todo
 {
 	GtkWidget * window;
@@ -74,7 +68,7 @@ struct _Todo
 	GtkListStore * priorities;
 	GtkTreeModel * filter;
 	GtkTreeModel * filter_sort;
-	TodoView filter_view;
+	TodoFilter filter_view;
 	GtkWidget * view;
 	GtkTreeViewColumn * columns[TD_COL_COUNT];
 	GtkWidget * about;
@@ -99,7 +93,7 @@ static void _todo_on_delete(gpointer data);
 #ifdef EMBEDDED
 static void _todo_on_preferences(gpointer data);
 #endif
-static void _todo_on_view_as(gpointer data);
+static void _todo_on_filter_as(gpointer data);
 
 /* view */
 static void _todo_on_task_activated(gpointer data);
@@ -110,9 +104,9 @@ static void _todo_on_task_priority_edited(GtkCellRendererText * renderer,
 		gchar * path, gchar * priority, gpointer data);
 static void _todo_on_task_title_edited(GtkCellRendererText * renderer,
 		gchar * path, gchar * title, gpointer data);
-static void _todo_on_view_all_tasks(gpointer data);
-static void _todo_on_view_completed_tasks(gpointer data);
-static void _todo_on_view_remaining_tasks(gpointer data);
+static void _todo_on_filter_all_tasks(gpointer data);
+static void _todo_on_filter_completed_tasks(gpointer data);
+static void _todo_on_filter_remaining_tasks(gpointer data);
 
 static gboolean _todo_on_filter_view(GtkTreeModel * model, GtkTreeIter * iter,
 		gpointer data);
@@ -194,19 +188,19 @@ Todo * todo_new(GtkWidget * window, GtkAccelGroup * group)
 	widget = desktop_toolbar_create(_toolbar, todo, group);
 	toolitem = gtk_menu_tool_button_new(NULL, _("View..."));
 	g_signal_connect_swapped(toolitem, "clicked", G_CALLBACK(
-				_todo_on_view_as), todo);
+				_todo_on_filter_as), todo);
 	menu = gtk_menu_new();
 	menuitem = gtk_menu_item_new_with_label(_("All tasks"));
 	g_signal_connect_swapped(menuitem, "activate", G_CALLBACK(
-				_todo_on_view_all_tasks), todo);
+				_todo_on_filter_all_tasks), todo);
 	gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);
 	menuitem = gtk_menu_item_new_with_label(_("Completed tasks"));
 	g_signal_connect_swapped(menuitem, "activate", G_CALLBACK(
-				_todo_on_view_completed_tasks), todo);
+				_todo_on_filter_completed_tasks), todo);
 	gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);
 	menuitem = gtk_menu_item_new_with_label(_("Remaining tasks"));
 	g_signal_connect_swapped(menuitem, "activate", G_CALLBACK(
-				_todo_on_view_remaining_tasks), todo);
+				_todo_on_filter_remaining_tasks), todo);
 	gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);
 	gtk_widget_show_all(menu);
 	gtk_menu_tool_button_set_menu(GTK_MENU_TOOL_BUTTON(toolitem), menu);
@@ -252,7 +246,7 @@ static void _new_view(Todo * todo)
 	}
 	todo->filter = gtk_tree_model_filter_new(GTK_TREE_MODEL(todo->store),
 			NULL);
-	todo->filter_view = TODO_VIEW_ALL_TASKS;
+	todo->filter_view = TODO_FILTER_ALL_TASKS;
 	gtk_tree_model_filter_set_visible_func(GTK_TREE_MODEL_FILTER(
 				todo->filter), _todo_on_filter_view, todo,
 			NULL);
@@ -345,13 +339,29 @@ void todo_delete(Todo * todo)
 
 
 /* accessors */
-/* todo_get_view */
-TodoView todo_get_view(Todo * todo)
+/* todo_get_filter */
+TodoFilter todo_get_filter(Todo * todo)
 {
 	return todo->filter_view;
 }
 
 
+/* todo_get_view */
+GtkWidget * todo_get_view(Todo * todo)
+{
+	return todo->view;
+}
+
+
+/* todo_get_view_column */
+GtkTreeViewColumn * todo_get_view_column(Todo * todo, unsigned int i)
+{
+	if(i >= 0 && i <= TD_COL_LAST)
+		return todo->columns[i];
+	return NULL;
+}
+
+
 /* todo_get_widget */
 GtkWidget * todo_get_widget(Todo * todo)
 {
@@ -359,8 +369,8 @@ GtkWidget * todo_get_widget(Todo * todo)
 }
 
 
-/* todo_set_view */
-void todo_set_view(Todo * todo, TodoView view)
+/* todo_set_filter */
+void todo_set_filter(Todo * todo, TodoFilter view)
 {
 	todo->filter_view = view;
 	gtk_tree_model_filter_refilter(GTK_TREE_MODEL_FILTER(todo->filter));
@@ -1111,30 +1121,30 @@ static void _todo_task_save(Todo * todo, GtkTreeIter * iter)
 
 
 /* callbacks */
-/* todo_on_view_all_tasks */
-static void _todo_on_view_all_tasks(gpointer data)
+/* todo_on_filter_all_tasks */
+static void _todo_on_filter_all_tasks(gpointer data)
 {
 	Todo * todo = data;
 
-	todo_set_view(todo, TODO_VIEW_ALL_TASKS);
+	todo_set_filter(todo, TODO_FILTER_ALL_TASKS);
 }
 
 
-/* todo_on_view_completed_tasks */
-static void _todo_on_view_completed_tasks(gpointer data)
+/* todo_on_filter_completed_tasks */
+static void _todo_on_filter_completed_tasks(gpointer data)
 {
 	Todo * todo = data;
 
-	todo_set_view(todo, TODO_VIEW_COMPLETED_TASKS);
+	todo_set_filter(todo, TODO_FILTER_COMPLETED_TASKS);
 }
 
 
-/* todo_on_view_remaining_tasks */
-static void _todo_on_view_remaining_tasks(gpointer data)
+/* todo_on_filter_remaining_tasks */
+static void _todo_on_filter_remaining_tasks(gpointer data)
 {
 	Todo * todo = data;
 
-	todo_set_view(todo, TODO_VIEW_REMAINING_TASKS);
+	todo_set_filter(todo, TODO_FILTER_REMAINING_TASKS);
 }
 
 
@@ -1177,15 +1187,15 @@ static void _todo_on_preferences(gpointer data)
 #endif
 
 
-/* todo_on_view_as */
-static void _todo_on_view_as(gpointer data)
+/* todo_on_filter_as */
+static void _todo_on_filter_as(gpointer data)
 {
 	Todo * todo = data;
-	TodoView view;
+	TodoFilter filter;
 
-	view = todo_get_view(todo);
-	view = (view + 1) % TODO_VIEW_COUNT;
-	todo_set_view(todo, view);
+	filter = todo_get_filter(todo);
+	filter = (filter + 1) % TODO_FILTER_COUNT;
+	todo_set_filter(todo, filter);
 }
 
 
@@ -1268,14 +1278,14 @@ static gboolean _todo_on_filter_view(GtkTreeModel * model, GtkTreeIter * iter,
 
 	switch(todo->filter_view)
 	{
-		case TODO_VIEW_COMPLETED_TASKS:
+		case TODO_FILTER_COMPLETED_TASKS:
 			gtk_tree_model_get(model, iter, TD_COL_DONE, &done, -1);
 			return done ? TRUE : FALSE;
-		case TODO_VIEW_REMAINING_TASKS:
+		case TODO_FILTER_REMAINING_TASKS:
 			gtk_tree_model_get(model, iter, TD_COL_DONE, &done, -1);
 			return done ? FALSE : TRUE;
 		default:
-		case TODO_VIEW_ALL_TASKS:
+		case TODO_FILTER_ALL_TASKS:
 			return TRUE;
 	}
 }
diff --git a/src/todo.h b/src/todo.h
index f06ae3d..7e9e600 100644
--- a/src/todo.h
+++ b/src/todo.h
@@ -31,48 +31,12 @@
 #ifndef TODO_TODO_H
 # define TODO_TODO_H
 
+# include "../include/Todo.h"
 # include "task.h"
-# include <gtk/gtk.h>
 
 
 /* Todo */
-/* types */
-typedef struct _Todo Todo;
-
-typedef enum _TodoPriority
-{
-	TODO_PRIORITY_UNKNOWN,
-	TODO_PRIORITY_LOW,
-	TODO_PRIORITY_MEDIUM,
-	TODO_PRIORITY_HIGH,
-	TODO_PRIORITY_URGENT
-} TodoPriority;
-
-typedef enum _TodoView
-{
-	TODO_VIEW_ALL_TASKS = 0,
-	TODO_VIEW_COMPLETED_TASKS,
-	TODO_VIEW_REMAINING_TASKS
-} TodoView;
-# define TODO_VIEW_LAST TODO_VIEW_REMAINING_TASKS
-# define TODO_VIEW_COUNT (TODO_VIEW_LAST + 1)
-
-
 /* functions */
-Todo * todo_new(GtkWidget * window, GtkAccelGroup * group);
-void todo_delete(Todo * todo);
-
-/* accessors */
-TodoView todo_get_view(Todo * todo);
-GtkWidget * todo_get_widget(Todo * todo);
-void todo_set_view(Todo * todo, TodoView view);
-
-/* useful */
-void todo_about(Todo * todo);
-int todo_error(Todo * todo, char const * message, int ret);
-
-void todo_show_preferences(Todo * todo, gboolean show);
-
 /* tasks */
 Task * todo_task_add(Todo * todo, Task * task);
 void todo_task_delete_selected(Todo * todo);
diff --git a/src/window.c b/src/window.c
index 8812cd0..e8c69d5 100644
--- a/src/window.c
+++ b/src/window.c
@@ -335,7 +335,7 @@ static void _todowindow_on_view_all_tasks(gpointer data)
 {
 	TodoWindow * todo = data;
 
-	todo_set_view(todo->todo, TODO_VIEW_ALL_TASKS);
+	todo_set_filter(todo->todo, TODO_FILTER_ALL_TASKS);
 }
 
 
@@ -344,7 +344,7 @@ static void _todowindow_on_view_completed_tasks(gpointer data)
 {
 	TodoWindow * todo = data;
 
-	todo_set_view(todo->todo, TODO_VIEW_COMPLETED_TASKS);
+	todo_set_filter(todo->todo, TODO_FILTER_COMPLETED_TASKS);
 }
 
 
@@ -353,7 +353,7 @@ static void _todowindow_on_view_remaining_tasks(gpointer data)
 {
 	TodoWindow * todo = data;
 
-	todo_set_view(todo->todo, TODO_VIEW_REMAINING_TASKS);
+	todo_set_filter(todo->todo, TODO_FILTER_REMAINING_TASKS);
 }
 
 
diff --git a/tools/project.conf b/tools/project.conf
index eb9311a..b0d5a72 100644
--- a/tools/project.conf
+++ b/tools/project.conf
@@ -1,7 +1,8 @@
 targets=todo
-cflags_force=`pkg-config --cflags libDesktop Mailer` -fPIC
+cppflags=-I../include
+cflags_force=`pkg-config --cflags Mailer` -fPIC
 cflags=-W -Wall -g -O2 -D_FORTIFY_SOURCE=2 -fstack-protector
-ldflags_force=`pkg-config --libs libDesktop`
+ldflags_force=`pkg-config --libs Mailer`
 ldflags=-Wl,-z,relro -Wl,-z,now
 dist=Makefile,subst.sh
 
@@ -9,8 +10,9 @@ dist=Makefile,subst.sh
 [todo]
 type=plugin
 sources=todo.c
+ldflags=-L../src -Wl,-rpath,$(LIBDIR) -lTodo
 install=$(LIBDIR)/Mailer/plugins
 
 #sources
 [todo.c]
-depends=../src/priority.c,../src/task.c,../src/taskedit.c,../src/todo.c
+depends=../src/libTodo$(SOEXT)
diff --git a/tools/todo.c b/tools/todo.c
index a628616..ac47b01 100644
--- a/tools/todo.c
+++ b/tools/todo.c
@@ -28,16 +28,9 @@
 
 
 
-#ifndef EMBEDDED
-# define EMBEDDED
-#endif
 #include <stdlib.h>
 #include <Desktop/Mailer/plugin.h>
-
-#include "../src/priority.c"
-#include "../src/task.c"
-#include "../src/taskedit.c"
-#include "../src/todo.c"
+#include "../include/Todo.h"
 
 
 /* Todo */
@@ -88,6 +81,7 @@ static MailerPlugin * _todo_init(MailerPluginHelper * helper)
 {
 	TodoPlugin * todo;
 	GtkWidget * widget;
+	GtkTreeViewColumn * column;
 	size_t i;
 
 	if((todo = malloc(sizeof(*todo))) == NULL)
@@ -101,12 +95,13 @@ static MailerPlugin * _todo_init(MailerPluginHelper * helper)
 	todo->widget = gtk_box_new(GTK_ORIENTATION_VERTICAL, 4);
 	widget = todo_get_widget(todo->todo);
 	gtk_box_pack_start(GTK_BOX(todo->widget), widget, TRUE, TRUE, 0);
-	gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(todo->todo->view),
-			FALSE);
+	widget = todo_get_view(todo->todo);
+	gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(widget), FALSE);
 	for(i = 0; i < TD_COL_COUNT; i++)
-		if(todo->todo->columns[i] != NULL && i != TD_COL_TITLE)
-			gtk_tree_view_column_set_visible(todo->todo->columns[i],
-					FALSE);
+		if((column = todo_get_view_column(todo->todo, i)) == NULL)
+			continue;
+		else if(i != TD_COL_TITLE)
+			gtk_tree_view_column_set_visible(column, FALSE);
 	gtk_widget_show_all(todo->widget);
 	return todo;
 }