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/* PSPP - a program for statistical analysis.
Copyright (C) 2007, 2010 Free Software Foundation, Inc.
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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "output/journal.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "data/file-name.h"
#include "libpspp/cast.h"
#include "libpspp/str.h"
#include "output/driver-provider.h"
#include "output/message-item.h"
#include "output/text-item.h"
#include "gl/error.h"
#include "gl/fwriteerror.h"
#include "gl/xalloc.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
struct journal_driver
{
struct output_driver driver;
FILE *file;
char *command_name;
};
static const struct output_driver_class journal_class;
/* Journal driver, if journaling is enabled. */
static struct journal_driver *journal;
/* Name of journal file. */
static char *journal_file_name;
static struct journal_driver *
journal_driver_cast (struct output_driver *driver)
{
assert (driver->class == &journal_class);
return UP_CAST (driver, struct journal_driver, driver);
}
static void
journal_close (void)
{
if (journal != NULL && journal->file != NULL)
{
if (fwriteerror (journal->file))
error (0, errno, _("error writing output file `%s'"),
journal_file_name);
journal->file = NULL;
}
}
static void
journal_destroy (struct output_driver *driver)
{
struct journal_driver *j = journal_driver_cast (driver);
journal_close ();
free (j->command_name);
free (j);
journal = NULL;
}
static void
journal_output (struct journal_driver *j, const char *s)
{
if (j->file == NULL)
{
j->file = fopen (journal_file_name, "a");
if (j->file == NULL)
{
error (0, errno, _("error opening output file `%s'"),
journal_file_name);
output_driver_destroy (&j->driver);
return;
}
}
fprintf (j->file, "%s\n", s);
/* Flush the journal in case the syntax we're about to write
causes a crash. Having the syntax already written to disk
makes postmortem analysis of the problem possible. */
fflush (j->file);
}
static void
journal_submit (struct output_driver *driver, const struct output_item *item)
{
struct journal_driver *j = journal_driver_cast (driver);
output_driver_track_current_command (item, &j->command_name);
if (is_text_item (item))
{
const struct text_item *text_item = to_text_item (item);
enum text_item_type type = text_item_get_type (text_item);
if (type == TEXT_ITEM_SYNTAX)
journal_output (j, text_item_get_text (text_item));
}
else if (is_message_item (item))
{
const struct message_item *message_item = to_message_item (item);
const struct msg *msg = message_item_get_msg (message_item);
char *s = msg_to_string (msg, j->command_name);
journal_output (j, s);
free (s);
}
}
static const struct output_driver_class journal_class =
{
"journal",
journal_destroy,
journal_submit,
NULL /* flush */
};
/* Enables journaling. */
void
journal_enable (void)
{
if (journal == NULL)
{
/* If no journal file name is configured, use the default. */
if (journal_file_name == NULL)
{
const char *output_path = default_output_path ();
journal_file_name = xasprintf ("%s%s", output_path, "pspp.jnl");
}
/* Create journal driver. */
journal = xzalloc (sizeof *journal);
output_driver_init (&journal->driver, &journal_class, "journal",
SETTINGS_DEVICE_UNFILTERED);
journal->file = NULL;
journal->command_name = NULL;
/* Register journal driver. */
output_driver_register (&journal->driver);
}
}
/* Disables journaling. */
void
journal_disable (void)
{
if (journal != NULL)
output_driver_destroy (&journal->driver);
}
/* Sets the name of the journal file to FILE_NAME. */
void
journal_set_file_name (const char *file_name)
{
journal_close ();
free (journal_file_name);
journal_file_name = xstrdup (file_name);
}
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