Bug #205137 - Configurable date formats in components

1 files changed, 571 insertions, 0 deletions

diff --git a/e-util/e-datetime-format.c b/e-util/e-datetime-format.c
new file mode 100644
index 0000000000..c6900ff8ca
--- /dev/null
+++ b/e-util/e-datetime-format.c
@@ -0,0 +1,571 @@
+/*
+ *
+ * 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/>
+ *
+ *
+ * Copyright (C) 1999-2009 Novell, Inc. (www.novell.com)
+ *
+ */
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+#include "e-datetime-format.h"
+#include "e-util.h"
+
+#define KEYS_FILENAME "datetime-formats"
+#define KEYS_GROUPNAME "formats"
+
+#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 GHashTable *key2fmt = NULL;
+
+static GKeyFile *setup_keyfile = NULL; /* used on the combo */
+static gint setup_keyfile_instances = 0;
+
+static void
+save_keyfile (GKeyFile *keyfile)
+{
+	gchar *contents;
+	gchar *filename;
+	gsize length;
+	GError *error = NULL;
+
+	g_return_if_fail (keyfile != NULL);
+
+	filename = g_build_filename (e_get_user_data_dir (), KEYS_FILENAME, NULL);
+	contents = g_key_file_to_data (keyfile, &length, NULL);
+
+	g_file_set_contents (filename, contents, length, &error);
+
+	if (error != NULL) {
+		g_warning ("%s", error->message);
+		g_error_free (error);
+	}
+
+	g_free (contents);
+	g_free (filename);
+}
+
+static void
+ensure_loaded (void)
+{
+	GKeyFile *keyfile;
+	gchar *str, **keys;
+	gint i;
+
+	if (key2fmt)
+		return;
+
+	key2fmt = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
+	keyfile = g_key_file_new ();
+
+	str = g_build_filename (e_get_user_data_dir (), KEYS_FILENAME, NULL);
+	g_key_file_load_from_file (keyfile, str, G_KEY_FILE_NONE, NULL);
+	g_free (str);
+
+	keys = g_key_file_get_keys (keyfile, KEYS_GROUPNAME, NULL, NULL);
+
+	if (keys) {
+		for (i = 0;  keys [i]; i++) {
+			str = g_key_file_get_string (keyfile, KEYS_GROUPNAME, keys [i], NULL);
+			if (str)
+				g_hash_table_insert (key2fmt, g_strdup (keys [i]), str);
+		}
+
+		g_strfreev (keys);
+	}
+
+	g_key_file_free (keyfile);
+}
+
+static const gchar *
+get_default_format (DTFormatKind kind, const gchar *key)
+{
+	const gchar *res = NULL;
+
+	ensure_loaded ();
+
+	switch (kind) {
+	case DTFormatKindDate:
+		res = g_hash_table_lookup (key2fmt, "Default-Date");
+		if (!res)
+			res = "%x";
+		break;
+	case DTFormatKindTime:
+		res = g_hash_table_lookup (key2fmt, "Default-Time");
+		if (!res)
+			res = "%X";
+		break;
+	case DTFormatKindDateTime:
+		res = g_hash_table_lookup (key2fmt, "Default-DateTime");
+		if (!res && key && g_str_has_prefix (key, "mail-table"))
+			res = "%ad %H:%M";
+		if (!res)
+			res = "%x %X"; /* %c is also possible, but it doesn't play well with time zone identifiers */
+		break;
+	case DTFormatKindShortDate:
+		res = g_hash_table_lookup (key2fmt, "Default-ShortDate");
+		if (!res)
+			res = "%A, %B %d";
+		break;
+	}
+
+	if (!res)
+		res = "%x %X";
+
+	return res;
+}
+
+static const gchar *
+get_format_internal (const gchar *key, DTFormatKind kind)
+{
+	const gchar *res;
+
+	ensure_loaded ();
+
+	g_return_val_if_fail (key != NULL, NULL);
+	g_return_val_if_fail (key2fmt != NULL, NULL);
+
+	res = g_hash_table_lookup (key2fmt, key);
+	if (!res)
+		res = get_default_format (kind, key);
+
+	return res;
+}
+
+static void
+set_format_internal (const gchar *key, const gchar *fmt, GKeyFile *keyfile)
+{
+	ensure_loaded ();
+	
+	g_return_if_fail (key != NULL);
+	g_return_if_fail (key2fmt != NULL);
+	g_return_if_fail (keyfile != NULL);
+
+	if (!fmt || !*fmt) {
+		g_hash_table_remove (key2fmt, key);
+		g_key_file_remove_key (keyfile, KEYS_GROUPNAME, key, NULL);
+	} else {
+		g_hash_table_insert (key2fmt, g_strdup (key), g_strdup (fmt));
+		g_key_file_set_string (keyfile, KEYS_GROUPNAME, key, fmt);
+	}
+}
+
+static gchar *
+format_relative_date (time_t tvalue, time_t ttoday, const struct tm *value, const struct tm *today)
+{
+	gchar *res = g_strdup (get_default_format (DTFormatKindDate, NULL));
+
+	g_return_val_if_fail (value != NULL, res);
+	g_return_val_if_fail (today != NULL, res);
+
+	/* if it's more than a week, use the default date format */
+	if (ttoday - tvalue > 7 * 24 * 60 * 60 ||
+	    tvalue - ttoday > 7 * 24 * 60 * 60)
+		return res;
+
+	g_free (res);
+
+	if (value->tm_year == today->tm_year &&
+	    value->tm_mon == today->tm_mon &&
+	    value->tm_mday == today->tm_mday) {
+		res = g_strdup (_("Today"));
+	} else {
+		gint diff = (gint) (tvalue - ttoday);
+		gint since_midnight = today->tm_sec + (60 * today->tm_min) + (60 * 60 * today->tm_hour);
+		gboolean future = (diff > 0);
+
+		if (!future)
+			diff *= -1;
+
+		diff = (diff - since_midnight) / (24 * 60 * 60);
+		if (diff <= 1) {
+			if (future)
+				res = g_strdup (_("Tomorrow"));
+			else
+				res = g_strdup (_("Yesterday"));
+		} else {
+			if (future)
+				res = g_strdup_printf (_("%d days from now"), diff);
+			else
+				res = g_strdup_printf (_("%d days ago"), diff);
+		}
+	}
+
+	return res;
+}
+
+static gchar *
+format_internal (const gchar *key, DTFormatKind kind, time_t tvalue, struct tm *tm_value)
+{
+	const gchar *fmt;
+	gchar buff[129];
+	GString *use_fmt = NULL;
+	gint i, last = 0;
+	struct tm today, value;
+	time_t ttoday;
+
+	tzset();
+	if (!tm_value) {
+		localtime_r (&tvalue, &value);
+		tm_value = &value;
+	} else {
+		/* recalculate tvalue to local (system) timezone */
+		tvalue = mktime (tm_value);
+		localtime_r (&tvalue, &value);
+	}
+
+	fmt = get_format_internal (key, kind);
+	for (i = 0; fmt [i]; i++) {
+		if (fmt [i] == '%') {
+			if (fmt [i + 1] == '%') {
+				i++;
+			} else if (fmt [i + 1] == 'a' && fmt [i + 2] == 'd' && (fmt [i + 3] == 0 || !g_ascii_isalpha (fmt [i + 3]))) {
+				gchar *ad;
+
+				/* "%ad" for abbreviated date */
+				if (!use_fmt) {
+					use_fmt = g_string_new ("");
+
+					ttoday = time (NULL);
+					localtime_r (&ttoday, &today);
+				}
+
+				g_string_append_len (use_fmt, fmt + last, i - last);
+				last = i + 3;
+				i += 2;
+
+				ad = format_relative_date (tvalue, ttoday, &value, &today);
+				if (ad)
+					g_string_append (use_fmt, ad);
+				else if (g_ascii_isspace (fmt [i + 3]))
+					i++;
+					
+				g_free (ad);
+			}
+		}
+	}
+
+	if (use_fmt && last < i) {
+		g_string_append_len (use_fmt, fmt + last, i - last);
+	}
+
+	e_utf8_strftime_fix_am_pm (buff, sizeof (buff) - 1, use_fmt ? use_fmt->str : fmt, tm_value);
+
+	if (use_fmt)
+		g_string_free (use_fmt, TRUE);
+
+	return g_strstrip (g_strdup (buff));
+}
+
+static void
+fill_combo_formats (GtkWidget *combo, const gchar *key, DTFormatKind kind)
+{
+	const gchar *date_items [] = {
+		N_ ("Use locale default"),
+		"%m/%d/%y",	/* American style */
+		"%m/%d/%Y",	/* American style, full year */
+		"%d.%m.%y",	/* non-American style */
+		"%d.%m.%Y",	/* non-American style, full year */
+		"%ad",		/* abbreviated date, like "Today" */
+		NULL
+	};
+
+	const gchar *time_items [] = {
+		N_ ("Use locale default"),
+		"%I:%M:%S %p",	/* 12hours style */
+		"%I:%M %p",	/* 12hours style, without seconds */
+		"%H:%M:%S",	/* 24hours style */
+		"%H:%M",	/* 24hours style, without seconds */
+		NULL
+	};
+
+	const gchar *datetime_items [] = {
+		N_ ("Use locale default"),
+		"%m/%d/%y %I:%M:%S %p",	/* American style */
+		"%m/%d/%Y %I:%M:%S %p",	/* American style, full year */
+		"%m/%d/%y %I:%M %p",	/* American style, without seconds */
+		"%m/%d/%Y %I:%M %p",	/* American style, without seconds, full year */
+		"%ad %I:%M:%S %p",	/* %ad is an abbreviated date, like "Today" */
+		"%ad %I:%M %p",		/* %ad is an abbreviated date, like "Today", without seconds */
+		"%d.%m.%y %H:%M:%S",	/* non-American style */
+		"%d.%m.%Y %H:%M:%S",	/* non-American style, full year */
+		"%d.%m.%y %H:%M",	/* non-American style, without seconds */
+		"%d.%m.%Y %H:%M",	/* non-American style, without seconds, full year */
+		"%ad %H:%M:%S",
+		"%ad %H:%M",		/* without seconds */
+		NULL
+	};
+
+	const gchar *shortdate_items [] = {
+		"%A, %B %d",
+		"%A, %d %B",
+		"%a, %b %d",
+		"%a, %d %b",
+		NULL
+	};
+
+	const gchar **items = NULL;
+	int i, idx = 0;
+	const gchar *fmt;
+
+	g_return_if_fail (GTK_IS_COMBO_BOX_ENTRY (combo));
+
+	switch (kind) {
+	case DTFormatKindDate:
+		items = date_items;
+		break;
+	case DTFormatKindTime:
+		items = time_items;
+		break;
+	case DTFormatKindDateTime:
+		items = datetime_items;
+		break;
+	case DTFormatKindShortDate:
+		items = shortdate_items;
+		break;
+	}
+
+	g_return_if_fail (items != NULL);
+
+	fmt = get_format_internal (key, kind);
+
+	for (i = 0; items [i]; i++) {
+		if (i == 0) {
+			gtk_combo_box_append_text ((GtkComboBox *) combo, _(items[i]));
+		} else {
+			gtk_combo_box_append_text ((GtkComboBox *) combo, items[i]);
+			if (!idx && fmt && g_str_equal (fmt, items[i]))
+				idx = i;
+		}
+	}
+
+	if (idx == 0 && fmt && !g_str_equal (fmt, get_default_format (kind, key))) {
+		gtk_combo_box_append_text ((GtkComboBox *) combo, fmt);
+		idx = i;
+	}
+
+	gtk_combo_box_set_active ((GtkComboBox *) combo, idx);
+}
+
+static void
+update_preview_widget (GtkWidget *combo)
+{
+	GtkWidget *preview;
+	const gchar *key;
+	gchar *value;
+	time_t now;
+
+	g_return_if_fail (combo != NULL);
+	g_return_if_fail (GTK_IS_COMBO_BOX_ENTRY (combo));
+
+	preview = g_object_get_data (G_OBJECT (combo), "preview-label");
+	g_return_if_fail (preview != NULL);
+	g_return_if_fail (GTK_IS_LABEL (preview));
+
+	key = g_object_get_data (G_OBJECT (combo), "format-key");
+	g_return_if_fail (key != NULL);
+
+	time (&now);
+
+	value = format_internal (key, GPOINTER_TO_INT (g_object_get_data (G_OBJECT (combo), "format-kind")), now, NULL);
+	gtk_label_set_text (GTK_LABEL (preview), value ? value : "");
+	g_free (value);
+}
+
+static void
+format_combo_changed_cb (GtkWidget *combo, gpointer user_data)
+{
+	const gchar *key;
+	DTFormatKind kind;
+	GKeyFile *keyfile;
+
+	g_return_if_fail (combo != NULL);
+	g_return_if_fail (GTK_IS_COMBO_BOX_ENTRY (combo));
+
+	key = g_object_get_data (G_OBJECT (combo), "format-key");
+	g_return_if_fail (key != NULL);
+
+	kind = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (combo), "format-kind"));
+	keyfile = g_object_get_data (G_OBJECT (combo), "setup-key-file");
+
+	if (kind != DTFormatKindShortDate && gtk_combo_box_get_active (GTK_COMBO_BOX (combo)) == 0) {
+		/* use locale default */
+		set_format_internal (key, NULL, keyfile);
+	} else {
+		gchar *text;
+
+		text = gtk_combo_box_get_active_text (GTK_COMBO_BOX (combo));
+		set_format_internal (key, text, keyfile);
+		g_free (text);
+	}
+
+	update_preview_widget (combo);
+
+	/* save on every change only because 'unref_setup_keyfile' is never called :(
+	   how about in kill-bonobo? */
+	save_keyfile (keyfile);
+}
+
+static gchar *
+gen_key (const gchar *component, const gchar *part, DTFormatKind kind)
+{
+	const gchar *kind_str = NULL;
+
+	g_return_val_if_fail (component != NULL, NULL);
+	g_return_val_if_fail (*component != 0, NULL);
+
+
+	switch (kind) {
+	case DTFormatKindDate:
+		kind_str = "Date";
+		break;
+	case DTFormatKindTime:
+		kind_str = "Time";
+		break;
+	case DTFormatKindDateTime:
+		kind_str = "DateTime";
+		break;
+	case DTFormatKindShortDate:
+		kind_str = "ShortDate";
+		break;
+	}
+
+	return g_strconcat (component, (part && *part) ? "-" : "", part && *part ? part : "", "-", kind_str, NULL);
+}
+
+static void
+unref_setup_keyfile (gpointer ptr)
+{
+	g_return_if_fail (ptr == setup_keyfile);
+	g_return_if_fail (setup_keyfile != NULL);
+	g_return_if_fail (setup_keyfile_instances > 0);
+
+	/* this is never called :( */
+	setup_keyfile_instances--;
+	if (setup_keyfile_instances == 0) {
+		save_keyfile (setup_keyfile);
+		g_key_file_free (setup_keyfile);
+		setup_keyfile = NULL;
+	}
+}
+
+/**
+ * e_datetime_format_add_setup_widget:
+ * @table: Where to attach widgets. Requires 3 columns.
+ * @row: On which row to attach.
+ * @component: Component identifier for the format. Cannot be empty nor NULL.
+ * @part: Part in the component, can be NULL or empty string.
+ * @kind: Kind of the format for the component/part.
+ * @caption: Caption for the widget, can be NULL, then the "Format:" is used.
+ *
+ * Adds a setup widget for a component and part. The table should have 3 columns.
+ * All the work related to loading and saving the value is done automatically,
+ * on user's changes.
+ **/
+void
+e_datetime_format_add_setup_widget (GtkWidget *table, gint row, const gchar *component, const gchar *part, DTFormatKind kind, const gchar *caption)
+{
+	GtkWidget *label, *combo, *preview, *align;
+	gchar *key;
+
+	g_return_if_fail (table != NULL);
+	g_return_if_fail (row >= 0);
+	g_return_if_fail (component != NULL);
+	g_return_if_fail (*component != 0);
+
+	key = gen_key (component, part, kind);
+
+	label = gtk_label_new_with_mnemonic (caption ? caption : _("Format:"));
+	combo = gtk_combo_box_entry_new_text ();
+
+	fill_combo_formats (combo, key, kind);
+	gtk_label_set_mnemonic_widget ((GtkLabel *)label, combo);
+
+	align = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
+	gtk_container_add (GTK_CONTAINER (align), combo);
+
+	gtk_table_attach ((GtkTable *) table, label, 0, 1, row, row + 1, 0, 0, 2, 0);
+	gtk_table_attach ((GtkTable *) table, align, 1, 2, row, row + 1, 0, 0, 2, 0);
+
+	preview = gtk_label_new ("");
+	gtk_misc_set_alignment (GTK_MISC (preview), 0.0, 0.5);
+	gtk_label_set_ellipsize (GTK_LABEL (preview), PANGO_ELLIPSIZE_END);
+	gtk_table_attach ((GtkTable *) table, preview, 2, 3, row, row + 1, GTK_EXPAND | GTK_FILL, 0, 2, 0);
+
+	if (!setup_keyfile) {
+		gchar *filename;
+
+		filename = g_build_filename (e_get_user_data_dir (), KEYS_FILENAME, NULL);
+		setup_keyfile = g_key_file_new ();
+		g_key_file_load_from_file (setup_keyfile, filename, G_KEY_FILE_NONE, NULL);
+		g_free (filename);
+
+		setup_keyfile_instances = 1;
+	} else {
+		setup_keyfile_instances++;
+	}
+
+	g_object_set_data (G_OBJECT (combo), "preview-label", preview);
+	g_object_set_data (G_OBJECT (combo), "format-kind", GINT_TO_POINTER (kind));
+	g_object_set_data_full (G_OBJECT (combo), "format-key", key, g_free);
+	g_object_set_data_full (G_OBJECT (combo), "setup-key-file", setup_keyfile, unref_setup_keyfile);
+	g_signal_connect (combo, "changed", G_CALLBACK (format_combo_changed_cb), NULL);
+
+	update_preview_widget (combo);
+
+	gtk_widget_show_all (table);
+}
+
+gchar *
+e_datetime_format_format (const gchar *component, const gchar *part, DTFormatKind kind, time_t value)
+{
+	gchar *key, *res;
+
+	g_return_val_if_fail (component != NULL, NULL);
+	g_return_val_if_fail (*component != 0, NULL);
+
+	key = gen_key (component, part, kind);
+	g_return_val_if_fail (key != NULL, NULL);
+
+	res = format_internal (key, kind, value, NULL);
+
+	g_free (key);
+
+	return res;
+}
+
+gchar *
+e_datetime_format_format_tm (const gchar *component, const gchar *part, DTFormatKind kind, struct tm *tm_time)
+{
+	gchar *key, *res;
+
+	g_return_val_if_fail (component != NULL, NULL);
+	g_return_val_if_fail (*component != 0, NULL);
+	g_return_val_if_fail (tm_time != NULL, NULL);
+
+	key = gen_key (component, part, kind);
+	g_return_val_if_fail (key != NULL, NULL);
+
+	res = format_internal (key, kind, 0, tm_time);
+
+	g_free (key);
+
+	return res;
+}