evolution/widgets/table/e-cell-date.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *		Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include <config.h>

#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <string.h>

#include <glib/gi18n.h>
#include "e-util/e-util.h"
#include "misc/e-unicode.h"

#include "e-cell-date.h"

G_DEFINE_TYPE (ECellDate, e_cell_date, E_CELL_TEXT_TYPE)

#ifdef G_OS_WIN32
/* The localtime() in Microsoft's C library *is* thread-safe */
#define localtime_r(timep, result)  (localtime (timep) ? memcpy ((result), localtime (timep), sizeof (*(result))) : 0)
#endif

static gchar *
ecd_get_text(ECellText *cell, ETableModel *model, gint col, gint row)
{
	time_t date = GPOINTER_TO_INT (e_table_model_value_at(model, col, row));
	time_t nowdate = time(NULL);
	time_t yesdate;
	struct tm then, now, yesterday;
	gchar buf[100];
	gchar *temp;
	gboolean done = FALSE;

	if (date == 0) {
		return g_strdup (_("?"));
	}

	tzset ();
	localtime_r (&date, &then);
	localtime_r (&nowdate, &now);

	if (nowdate - date < 60 * 60 * 8 && nowdate > date) {
		e_utf8_strftime_fix_am_pm (buf, 100, _("%l:%M %p"), &then);
		done = TRUE;
	}

	if (!done) {
		if (then.tm_mday == now.tm_mday &&
		    then.tm_mon == now.tm_mon &&
		    then.tm_year == now.tm_year) {
			e_utf8_strftime_fix_am_pm (buf, 100, _("Today %l:%M %p"), &then);
			done = TRUE;
		}
	}
	if (!done) {
		yesdate = nowdate - 60 * 60 * 24;
		localtime_r (&yesdate, &yesterday);
		if (then.tm_mday == yesterday.tm_mday &&
		    then.tm_mon == yesterday.tm_mon &&
		    then.tm_year == yesterday.tm_year) {
			e_utf8_strftime_fix_am_pm (buf, 100, _("Yesterday %l:%M %p"), &then);
			done = TRUE;
		}
	}
	if (!done) {
		gint i;
		for (i = 2; i < 7; i++) {
			yesdate = nowdate - 60 * 60 * 24 * i;
			localtime_r (&yesdate, &yesterday);
			if (then.tm_mday == yesterday.tm_mday &&
			    then.tm_mon == yesterday.tm_mon &&
			    then.tm_year == yesterday.tm_year) {
				e_utf8_strftime_fix_am_pm (buf, 100, _("%a %l:%M %p"), &then);
				done = TRUE;
				break;
			}
		}
	}
	if (!done) {
		if (then.tm_year == now.tm_year) {
			e_utf8_strftime_fix_am_pm (buf, 100, _("%b %d %l:%M %p"), &then);
		} else {
			e_utf8_strftime_fix_am_pm (buf, 100, _("%b %d %Y"), &then);
		}
	}
	temp = buf;
	while ((temp = strstr (temp, "  "))) {
		memmove (temp, temp + 1, strlen (temp));
	}
	return g_strstrip (g_strdup (buf));
}

static void
ecd_free_text(ECellText *cell, gchar *text)
{
	g_free(text);
}

static void
e_cell_date_class_init (ECellDateClass *klass)
{
	ECellTextClass *ectc = E_CELL_TEXT_CLASS (klass);

	ectc->get_text  = ecd_get_text;
	ectc->free_text = ecd_free_text;
}

static void
e_cell_date_init (ECellDate *ecd)
{
}

/**
 * e_cell_date_new:
 * @fontname: font to be used to render on the screen
 * @justify: Justification of the string in the cell.
 *
 * Creates a new ECell renderer that can be used to render dates that
 * that come from the model.  The value returned from the model is
 * interpreted as being a time_t.
 *
 * The ECellDate object support a large set of properties that can be
 * configured through the Gtk argument system and allows the user to have
 * a finer control of the way the string is displayed.  The arguments supported
 * allow the control of strikeout, bold, color and a date filter.
 *
 * The arguments "strikeout_column", "underline_column", "bold_column"
 * and "color_column" set and return an integer that points to a
 * column in the model that controls these settings.  So controlling
 * the way things are rendered is achieved by having special columns
 * in the model that will be used to flag whether the date should be
 * rendered with strikeout, underline, or bolded.  In the case of the
 * "color_column" argument, the column in the model is expected to
 * have a string that can be parsed by gdk_color_parse().
 *
 * Returns: an ECell object that can be used to render dates.
 */
ECell *
e_cell_date_new (const gchar *fontname, GtkJustification justify)
{
	ECellDate *ecd = g_object_new (E_CELL_DATE_TYPE, NULL);

	e_cell_text_construct(E_CELL_TEXT(ecd), fontname, justify);

	return (ECell *) ecd;
}