Todo/src/todo.c

/* $Id$ */
static char _copyright[] =
"Copyright (c) 2010 Pierre Pronchery <khorben@defora.org>";
/* This file is part of DeforaOS Desktop Todo */
static char const _license[] =
"This program is free software: you can redistribute it and/or modify\n"
"it under the terms of the GNU General Public License as published by\n"
"the Free Software Foundation, version 3 of the License.\n"
"\n"
"This program is distributed in the hope that it will be useful,\n"
"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
"GNU General Public License for more details.\n"
"\n"
"You should have received a copy of the GNU General Public License\n"
"along with this program.  If not, see <http://www.gnu.org/licenses/>.\n";



#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <libintl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <System.h>
#include <Desktop.h>
#include "callbacks.h"
#include "todo.h"
#include "../config.h"
#define _(string) gettext(string)
#define N_(string) (string)


/* Todo */
/* private */
/* types */
struct _Todo
{
	GtkWidget * window;
	GtkWidget * scrolled;
	GtkListStore * store;
	GtkListStore * priorities;
	GtkTreeModel * filter;
	GtkTreeModel * filter_sort;
	TodoView filter_view;
	GtkWidget * view;
	GtkWidget * statusbar;
	GtkWidget * about;
};


/* constants */
enum { 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 };
#define TD_COL_LAST TD_COL_CATEGORY
#define TD_NUM_COLS (TD_COL_LAST + 1)

static struct
{
	int col;
	char const * title;
	int sort;
	GCallback callback;
} _todo_columns[] =
{
	{ TD_COL_DONE, N_("Done"), TD_COL_DONE, G_CALLBACK(
			on_task_done_toggled) },
	{ TD_COL_TITLE, N_("Title"), TD_COL_TITLE, G_CALLBACK(
			on_task_title_edited) },
	{ TD_COL_DISPLAY_START, N_("Beginning"), TD_COL_START, NULL },
	{ TD_COL_DISPLAY_END, N_("Completion"), TD_COL_END, NULL },
	{ 0, NULL, 0, NULL }
};

static struct
{
	unsigned int priority;
	char const * title;
} _todo_priorities[] =
{
	{ TODO_PRIORITY_UNKNOWN,N_("Unknown")	},
	{ TODO_PRIORITY_LOW,	N_("Low")	},
	{ TODO_PRIORITY_MEDIUM,	N_("Medium")	},
	{ TODO_PRIORITY_HIGH,	N_("High")	},
	{ TODO_PRIORITY_URGENT,	N_("Urgent")	},
	{ 0,			NULL		}
};


/* variables */
static char const * _authors[] =
{
	"Pierre Pronchery <khorben@defora.org>",
	NULL
};

#ifndef EMBEDDED
/* menubar */
static DesktopMenu _file_menu[] =
{
	{ N_("_New"), G_CALLBACK(on_file_new), GTK_STOCK_NEW, GDK_CONTROL_MASK,
		GDK_N },
	{ N_("_Edit"), G_CALLBACK(on_file_edit), GTK_STOCK_EDIT,
		GDK_CONTROL_MASK, GDK_E },
	{ "", NULL, NULL, 0, 0 },
	{ N_("_Close"), G_CALLBACK(on_file_close), GTK_STOCK_CLOSE,
		GDK_CONTROL_MASK, GDK_W },
	{ NULL, NULL, NULL, 0, 0 }
};
static DesktopMenu _edit_menu[] =
{
#if GTK_CHECK_VERSION(2, 10, 0)
	{ N_("_Select all"), G_CALLBACK(on_edit_select_all),
		GTK_STOCK_SELECT_ALL,
#else
	{ N_("_Select all"), G_CALLBACK(on_edit_select_all), "edit-select-all",
#endif
		GDK_CONTROL_MASK, GDK_A },
	{ "", NULL, NULL, 0, 0 },
	{ N_("_Delete"), G_CALLBACK(on_edit_delete), GTK_STOCK_DELETE, 0, 0 },
	{ "", NULL, NULL, 0, 0 },
	{ N_("_Preferences"), G_CALLBACK(on_edit_preferences),
		GTK_STOCK_PREFERENCES, GDK_CONTROL_MASK, GDK_P },
	{ NULL, NULL, NULL, 0, 0 }
};
static DesktopMenu _view_menu[] =
{
	{ N_("_All tasks"), G_CALLBACK(on_view_all_tasks), NULL, 0, 0 },
	{ N_("_Completed tasks"), G_CALLBACK(on_view_completed_tasks), NULL, 0,
		0 },
	{ N_("_Remaining tasks"), G_CALLBACK(on_view_remaining_tasks), NULL, 0,
		0 },
	{ NULL, NULL, NULL, 0, 0 }
};
static DesktopMenu _help_menu[] =
{
#if GTK_CHECK_VERSION(2, 6, 0)
	{ N_("_About"), G_CALLBACK(on_help_about), GTK_STOCK_ABOUT, 0, 0 },
#else
	{ N_("_About"), G_CALLBACK(on_help_about), NULL, 0, 0 },
#endif
	{ NULL, NULL, NULL, 0, 0 }
};
static DesktopMenubar _menubar[] =
{
	{ N_("_File"), _file_menu },
	{ N_("_Edit"), _edit_menu },
	{ N_("_View"), _view_menu },
	{ N_("_Help"), _help_menu },
	{ NULL, NULL },
};
#endif

/* toolbar */
static DesktopToolbar _toolbar[] =
{
	{ N_("New task"), G_CALLBACK(on_new), GTK_STOCK_NEW, 0, 0, NULL },
	{ N_("Edit task"), G_CALLBACK(on_edit), GTK_STOCK_EDIT, 0, 0, NULL },
	{ "", NULL, NULL, 0, 0, NULL },
#if GTK_CHECK_VERSION(2, 10, 0)
	{ N_("Select all"), G_CALLBACK(on_select_all), GTK_STOCK_SELECT_ALL, 0,
		0, NULL },
#else
	{ N_("Select all"), G_CALLBACK(on_select_all), "edit-select-all", 0, 0,
		NULL },
#endif
	{ N_("Delete task"), G_CALLBACK(on_delete), GTK_STOCK_DELETE, 0, 0,
		NULL },
#ifdef EMBEDDED
	{ "", NULL, NULL, 0, 0, NULL },
	{ N_("Preferences"), G_CALLBACK(on_preferences), GTK_STOCK_PREFERENCES,
		0, 0, NULL },
#endif
	{ NULL, NULL, NULL, 0, 0, NULL }
};


/* prototypes */
static int _todo_confirm(GtkWidget * window, char const * message);
static gboolean _todo_get_iter(Todo * todo, GtkTreeIter * iter,
		GtkTreePath * path);
static char * _todo_task_get_directory(void);
static char * _todo_task_get_filename(char const * filename);
static char * _todo_task_get_new_filename(void);
static void _todo_task_save(Todo * todo, GtkTreeIter * iter);

/* callbacks */
static gboolean _on_todo_filter_view(GtkTreeModel * model, GtkTreeIter * iter,
		gpointer data);


/* public */
/* functions */
/* todo_new */
static void _new_view(Todo * todo);
static gboolean _new_idle(gpointer data);

Todo * todo_new(void)
{
	Todo * todo;
	GtkAccelGroup * group;
	GtkWidget * vbox;
	GtkWidget * widget;

	if((todo = malloc(sizeof(*todo))) == NULL)
	{
		error_set_code(1, "%s", strerror(errno));
		return NULL;
	}
	/* main window */
	group = gtk_accel_group_new();
	todo->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_window_add_accel_group(GTK_WINDOW(todo->window), group);
	gtk_window_set_default_size(GTK_WINDOW(todo->window), 300, 400);
	gtk_window_set_icon_name(GTK_WINDOW(todo->window), "stock_todo");
	gtk_window_set_title(GTK_WINDOW(todo->window), _("Todo"));
	g_signal_connect_swapped(G_OBJECT(todo->window), "delete-event",
			G_CALLBACK(on_closex), todo);
	vbox = gtk_vbox_new(FALSE, 0);
#ifndef EMBEDDED
	/* menubar */
	widget = desktop_menubar_create(_menubar, todo, group);
	gtk_box_pack_start(GTK_BOX(vbox), widget, FALSE, TRUE, 0);
#endif
	/* toolbar */
	widget = desktop_toolbar_create(_toolbar, todo, group);
	gtk_box_pack_start(GTK_BOX(vbox), widget, FALSE, TRUE, 0);
	/* view */
	todo->scrolled = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(todo->scrolled),
			GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
	_new_view(todo);
	gtk_box_pack_start(GTK_BOX(vbox), todo->scrolled, TRUE, TRUE, 0);
	/* statusbar */
	todo->statusbar = gtk_statusbar_new();
	gtk_box_pack_start(GTK_BOX(vbox), todo->statusbar, FALSE, TRUE, 0);
	todo->about = NULL;
	gtk_container_add(GTK_CONTAINER(todo->window), vbox);
	gtk_widget_show_all(todo->window);
	g_idle_add(_new_idle, todo);
	return todo;
}

static void _new_view(Todo * todo)
{
	size_t i;
	GtkTreeIter iter;
	GtkTreeSelection * sel;
	GtkCellRenderer * renderer;
	GtkTreeViewColumn * column;

	todo->store = gtk_list_store_new(TD_NUM_COLS,
			G_TYPE_POINTER, /* task */
			G_TYPE_BOOLEAN, /* done */
			G_TYPE_STRING,	/* title */
			G_TYPE_UINT,	/* start */
			G_TYPE_STRING,	/* display start */
			G_TYPE_UINT,	/* end */
			G_TYPE_STRING,	/* display end */
			G_TYPE_UINT,	/* priority */
			G_TYPE_STRING,	/* display priority */
			G_TYPE_STRING);	/* category */
	todo->priorities = gtk_list_store_new(2, G_TYPE_UINT, G_TYPE_STRING);
	for(i = 0; _todo_priorities[i].title != NULL; i++)
	{
		gtk_list_store_append(todo->priorities, &iter);
		gtk_list_store_set(todo->priorities, &iter,
				0, _todo_priorities[i].priority,
				1, _todo_priorities[i].title, -1);
	}
	todo->filter = gtk_tree_model_filter_new(GTK_TREE_MODEL(todo->store),
			NULL);
	todo->filter_view = TODO_VIEW_ALL_TASKS;
	gtk_tree_model_filter_set_visible_func(GTK_TREE_MODEL_FILTER(
				todo->filter), _on_todo_filter_view, todo,
			NULL);
	todo->filter_sort = gtk_tree_model_sort_new_with_model(todo->filter);
	todo->view = gtk_tree_view_new_with_model(GTK_TREE_MODEL(
				todo->filter_sort));
	if((sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(todo->view)))
			!= NULL)
		gtk_tree_selection_set_mode(sel, GTK_SELECTION_MULTIPLE);
	/* done column */
	renderer = gtk_cell_renderer_toggle_new();
	g_signal_connect(G_OBJECT(renderer), "toggled", G_CALLBACK(
				_todo_columns[0].callback), todo);
	column = gtk_tree_view_column_new_with_attributes(
			_(_todo_columns[0].title), renderer, "active",
			_todo_columns[0].col, NULL);
	gtk_tree_view_column_set_sizing(GTK_TREE_VIEW_COLUMN(column),
			GTK_TREE_VIEW_COLUMN_FIXED);
	gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column), 50);
	gtk_tree_view_column_set_sort_column_id(column, TD_COL_DONE);
	gtk_tree_view_append_column(GTK_TREE_VIEW(todo->view), column);
	/* other columns */
	for(i = 1; _todo_columns[i].title != NULL; i++)
	{
		renderer = gtk_cell_renderer_text_new();
		if(_todo_columns[i].callback != NULL)
		{
			g_object_set(G_OBJECT(renderer), "editable", TRUE,
					NULL);
			g_signal_connect(G_OBJECT(renderer), "edited",
					G_CALLBACK(_todo_columns[i].callback),
					todo);
		}
		column = gtk_tree_view_column_new_with_attributes(
				_(_todo_columns[i].title), renderer, "text",
				_todo_columns[i].col, NULL);
		gtk_tree_view_column_set_sort_column_id(column,
				_todo_columns[i].sort);
		gtk_tree_view_append_column(GTK_TREE_VIEW(todo->view), column);
	}
	/* priority column */
	renderer = gtk_cell_renderer_combo_new();
	g_object_set(renderer, "model", todo->priorities,
			"text-column", 1,
			"editable", TRUE, NULL);
	g_signal_connect(renderer, "edited", G_CALLBACK(
				on_task_priority_edited), todo);
	column = gtk_tree_view_column_new_with_attributes(_("Priority"),
			renderer, "text", TD_COL_DISPLAY_PRIORITY, NULL);
	gtk_tree_view_column_set_sort_column_id(column, TD_COL_PRIORITY);
	gtk_container_add(GTK_CONTAINER(todo->scrolled), todo->view);
	gtk_tree_view_append_column(GTK_TREE_VIEW(todo->view), column);
}

static gboolean _new_idle(gpointer data)
{
	Todo * todo = data;

	todo_task_reload_all(todo);
	return FALSE;
}


/* todo_delete */
void todo_delete(Todo * todo)
{
	todo_task_save_all(todo);
	todo_task_remove_all(todo);
	free(todo);
}


/* accessors */
/* todo_set_view */
void todo_set_view(Todo * todo, TodoView view)
{
	todo->filter_view = view;
	gtk_tree_model_filter_refilter(GTK_TREE_MODEL_FILTER(todo->filter));
}


/* useful */
/* todo_about */
void todo_about(Todo * todo)
{
	if(todo->about != NULL)
	{
		gtk_widget_show(todo->about);
		return;
	}
	todo->about = desktop_about_dialog_new();
	gtk_window_set_transient_for(GTK_WINDOW(todo->about),
			GTK_WINDOW(todo->window));
	desktop_about_dialog_set_authors(todo->about, _authors);
	desktop_about_dialog_set_copyright(todo->about, _copyright);
	desktop_about_dialog_set_logo_icon_name(todo->about, "stock_todo");
	desktop_about_dialog_set_license(todo->about, _license);
	desktop_about_dialog_set_name(todo->about, PACKAGE);
	desktop_about_dialog_set_version(todo->about, VERSION);
	gtk_widget_show(todo->about);
}


/* todo_error */
int todo_error(Todo * todo, char const * message, int ret)
{
	GtkWidget * dialog;

	dialog = gtk_message_dialog_new(GTK_WINDOW(todo->window),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s",
#if GTK_CHECK_VERSION(2, 8, 0)
			_("Error"));
	gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dialog),
			"%s",
#endif
			message);
	gtk_window_set_title(GTK_WINDOW(dialog), _("Error"));
	gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_destroy(dialog);
	return ret;
}


/* tasks */
/* todo_task_add */
Task * todo_task_add(Todo * todo, Task * task)
{
	GtkTreeIter iter;
	char * filename;
	time_t start;
	struct tm t;
	char beginning[32] = "";
	time_t end;
	char completion[32] = "";
	char const * priority;
	TodoPriority tp = TODO_PRIORITY_UNKNOWN;
	size_t i;

	if(task == NULL)
	{
		if((task = task_new()) == NULL)
			return NULL;
		if((filename = _todo_task_get_new_filename()) == NULL)
		{
			todo_error(todo, error_get(), 0);
			task_delete(task);
			return NULL;
		}
		task_set_filename(task, filename);
		free(filename);
		task_set_title(task, _("New task"));
		task_save(task);
	}
	gtk_list_store_insert(todo->store, &iter, 0);
	if((start = task_get_start(task)) != 0)
	{
		localtime_r(&start, &t);
		strftime(beginning, sizeof(beginning), "%c", &t);
	}
	if((end = task_get_end(task)) != 0)
	{
		localtime_r(&end, &t);
		strftime(completion, sizeof(completion), "%c", &t);
	}
	priority = task_get_priority(task);
	for(i = 0; priority != NULL && _todo_priorities[i].title != NULL; i++)
		if(strcmp(_(_todo_priorities[i].title), priority) == 0)
		{
			tp = _todo_priorities[i].priority;
			break;
		}
	gtk_list_store_set(todo->store, &iter, TD_COL_TASK, task,
			TD_COL_DONE, task_get_done(task) > 0 ? TRUE : FALSE,
			TD_COL_TITLE, task_get_title(task),
			TD_COL_START, start,
			TD_COL_DISPLAY_START, beginning,
			TD_COL_END, end,
			TD_COL_DISPLAY_END, completion,
			TD_COL_PRIORITY, tp,
			TD_COL_DISPLAY_PRIORITY, priority, -1);
	return task;
}


/* todo_task_delete_selected */
static void _task_delete_selected_foreach(GtkTreeRowReference * reference,
		Todo * todo);

void todo_task_delete_selected(Todo * todo)
{
	GtkTreeSelection * treesel;
	GList * selected;
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	GtkTreeRowReference * reference;
	GList * s;
	GtkTreePath * path;

	if((treesel = gtk_tree_view_get_selection(GTK_TREE_VIEW(todo->view)))
			== NULL)
		return;
	if((selected = gtk_tree_selection_get_selected_rows(treesel, NULL))
			== NULL)
		return;
	if(_todo_confirm(todo->window, _("Are you sure you want to delete the"
					" selected task(s)?")) != 0)
		return;
	for(s = g_list_first(selected); s != NULL; s = g_list_next(s))
	{
		if((path = s->data) == NULL)
			continue;
		reference = gtk_tree_row_reference_new(model, path);
		s->data = reference;
		gtk_tree_path_free(path);
	}
	g_list_foreach(selected, (GFunc)_task_delete_selected_foreach, todo);
	g_list_free(selected);
}

static void _task_delete_selected_foreach(GtkTreeRowReference * reference,
		Todo * todo)
{
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	GtkTreePath * path;
	GtkTreeIter iter;
	Task * task;

	if(reference == NULL)
		return;
	if((path = gtk_tree_row_reference_get_path(reference)) == NULL)
		return;
	if(_todo_get_iter(todo, &iter, path) == TRUE)
	{
		gtk_tree_model_get(model, &iter, TD_COL_TASK, &task, -1);
		task_unlink(task);
		task_delete(task);
	}
	gtk_list_store_remove(todo->store, &iter);
	gtk_tree_path_free(path);
}


/* todo_task_edit */
void todo_task_edit(Todo * todo)
{
	/* FIXME implement */
}


/* todo_task_reload_all */
int todo_task_reload_all(Todo * todo)
{
	int ret = 0;
	char * filename;
	DIR * dir;
	struct dirent * de;
	Task * task;

	if((filename = _todo_task_get_directory()) == NULL)
		return todo_error(todo, error_get(), 1);
	if((dir = opendir(filename)) == NULL)
	{
		if(errno != ENOENT)
		{
			error_set("%s: %s", filename, strerror(errno));
			ret = todo_error(todo, error_get(), 1);
		}
	}
	else
	{
		todo_task_remove_all(todo);
		while((de = readdir(dir)) != NULL)
		{
			if(strncmp(de->d_name, "task.", 5) != 0)
				continue;
			free(filename);
			if((filename = _todo_task_get_filename(de->d_name))
					== NULL)
				continue; /* XXX report error */
			if((task = task_new_from_file(filename)) == NULL)
				continue; /* XXX report error */
			if(todo_task_add(todo, task) == NULL)
			{
				task_delete(task);
				continue; /* XXX report error */
			}
		}
	}
	free(filename);
	return ret;
}


/* todo_task_remove_all */
void todo_task_remove_all(Todo * todo)
{
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	GtkTreeIter iter;
	gboolean valid;
	Task * task;

	valid = gtk_tree_model_get_iter_first(model, &iter);
	for(; valid == TRUE; valid = gtk_tree_model_iter_next(model, &iter))
	{
		gtk_tree_model_get(model, &iter, TD_COL_TASK, &task, -1);
		task_delete(task);
	}
	gtk_list_store_clear(todo->store);
}


/* todo_task_save_all */
void todo_task_save_all(Todo * todo)
{
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	GtkTreeIter iter;
	gboolean valid;

	valid = gtk_tree_model_get_iter_first(model, &iter);
	for(; valid == TRUE; valid = gtk_tree_model_iter_next(model, &iter))
		_todo_task_save(todo, &iter);
}


/* todo_task_select_all */
void todo_task_select_all(Todo * todo)
{
	GtkTreeSelection * sel;

	sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(todo->view));
	gtk_tree_selection_select_all(sel);
}


/* todo_task_set_priority */
void todo_task_set_priority(Todo * todo, GtkTreePath * path,
		char const * priority)
{
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	GtkTreeIter iter;
	Task * task;
	size_t i;
	TodoPriority tp = TODO_PRIORITY_UNKNOWN;

	_todo_get_iter(todo, &iter, path);
	gtk_tree_model_get(model, &iter, TD_COL_TASK, &task, -1);
	task_set_priority(task, priority);
	for(i = 0; _todo_priorities[i].title != NULL; i++)
		if(strcmp(_(_todo_priorities[i].title), priority) == 0)
		{
			tp = _todo_priorities[i].priority;
			break;
		}
	gtk_list_store_set(todo->store, &iter, TD_COL_PRIORITY, tp,
			TD_COL_DISPLAY_PRIORITY, priority, -1);
	task_save(task);
}


/* todo_task_set_title */
void todo_task_set_title(Todo * todo, GtkTreePath * path, char const * title)
{
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	GtkTreeIter iter;
	Task * task;

	_todo_get_iter(todo, &iter, path);
	gtk_tree_model_get(model, &iter, TD_COL_TASK, &task, -1);
	task_set_title(task, title);
	gtk_list_store_set(todo->store, &iter, TD_COL_TITLE, title, -1);
	task_save(task);
}


/* todo_task_toggle_done */
void todo_task_toggle_done(Todo * todo, GtkTreePath * path)
{
	GtkTreeIter iter;
	Task * task;
	gboolean done;
	time_t end;
	struct tm t;
	char completion[32] = "";

	_todo_get_iter(todo, &iter, path);
	gtk_tree_model_get(GTK_TREE_MODEL(todo->store), &iter,
			TD_COL_TASK, &task, TD_COL_DONE, &done, -1);
	done = !done;
	task_set_done(task, done);
	if((end = task_get_end(task)) != 0) /* XXX code duplication */
	{
		localtime_r(&end, &t);
		strftime(completion, sizeof(completion), "%c", &t);
	}
	gtk_list_store_set(todo->store, &iter, TD_COL_DONE, done,
			TD_COL_END, end, TD_COL_DISPLAY_END, completion, -1);
	task_save(task);
}


/* private */
/* functions */
/* todo_confirm */
static int _todo_confirm(GtkWidget * window, char const * message)
{
	GtkWidget * dialog;
	int res;

	dialog = gtk_message_dialog_new(GTK_WINDOW(window),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, "%s",
#if GTK_CHECK_VERSION(2, 8, 0)
			_("Question"));
	gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dialog),
			"%s",
#endif
			message);
	gtk_window_set_title(GTK_WINDOW(dialog), _("Question"));
	res = gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_destroy(dialog);
	if(res == GTK_RESPONSE_YES)
		return 0;
	return 1;
}


/* todo_get_iter */
static gboolean _todo_get_iter(Todo * todo, GtkTreeIter * iter,
		GtkTreePath * path)
{
	GtkTreeIter p;

	if(gtk_tree_model_get_iter(GTK_TREE_MODEL(todo->filter_sort), iter,
				path) == FALSE)
		return FALSE;
	gtk_tree_model_sort_convert_iter_to_child_iter(GTK_TREE_MODEL_SORT(
				todo->filter_sort), &p, iter);
	gtk_tree_model_filter_convert_iter_to_child_iter(GTK_TREE_MODEL_FILTER(
				todo->filter), iter, &p);
	return TRUE;
}


/* todo_task_get_directory */
static char * _todo_task_get_directory(void)
{
	char const * homedir;
	size_t len;
	char const directory[] = ".todo";
	char * filename;

	if((homedir = getenv("HOME")) == NULL)
		homedir = g_get_home_dir();
	len = strlen(homedir) + 1 + sizeof(directory);
	if((filename = malloc(len)) == NULL)
		return NULL;
	snprintf(filename, len, "%s/%s", homedir, directory);
	return filename;
}


/* todo_task_get_filename */
static char * _todo_task_get_filename(char const * filenam)
{
	char const * homedir;
	int len;
	char const directory[] = ".todo";
	char * pathname;

	if((homedir = getenv("HOME")) == NULL)
		homedir = g_get_home_dir();
	len = strlen(homedir) + 1 + sizeof(directory) + 1 + strlen(filenam) + 1;
	if((pathname = malloc(len)) == NULL)
		return NULL;
	snprintf(pathname, len, "%s/%s/%s", homedir, directory, filenam);
	return pathname;
}


/* todo_task_get_new_filename */
static char * _todo_task_get_new_filename(void)
{
	char const * homedir;
	int len;
	char const directory[] = ".todo";
	char template[] = "task.XXXXXX";
	char * filename;
	int fd;

	if((homedir = getenv("HOME")) == NULL)
		homedir = g_get_home_dir();
	len = strlen(homedir) + 1 + sizeof(directory) + 1 + sizeof(template);
	if((filename = malloc(len)) == NULL)
		return NULL;
	snprintf(filename, len, "%s/%s", homedir, directory);
	if((mkdir(filename, 0777) != 0 && errno != EEXIST)
			|| snprintf(filename, len, "%s/%s/%s", homedir,
				directory, template) >= len
			|| (fd = mkstemp(filename)) < 0)
	{
		error_set("%s: %s", filename, strerror(errno));
		free(filename);
		return NULL;
	}
	close(fd);
	return filename;
}


/* todo_task_save */
static void _todo_task_save(Todo * todo, GtkTreeIter * iter)
{
	GtkTreeModel * model = GTK_TREE_MODEL(todo->store);
	Task * task;

	gtk_tree_model_get(model, iter, TD_COL_TASK, &task, -1);
	task_save(task);
}


/* callbacks */
/* on_todo_filter_view */
static gboolean _on_todo_filter_view(GtkTreeModel * model, GtkTreeIter * iter,
		gpointer data)
{
	Todo * todo = data;
	gboolean done = FALSE;

	switch(todo->filter_view)
	{
		case TODO_VIEW_COMPLETED_TASKS:
			gtk_tree_model_get(model, iter, TD_COL_DONE, &done, -1);
			return done ? TRUE : FALSE;
		case TODO_VIEW_REMAINING_TASKS:
			gtk_tree_model_get(model, iter, TD_COL_DONE, &done, -1);
			return done ? FALSE : TRUE;
		default:
		case TODO_VIEW_ALL_TASKS:
			return TRUE;
	}
}