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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2010-2025 Free Software Foundation, Inc.
GNU Mailutils 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, or (at your option)
any later version.
GNU Mailutils 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#if defined(HAVE_CONFIG_H)
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <mailutils/mailutils.h>
#include "mu.h"
char filter_docstring[] = N_("apply a chain of filters to the input");
static char filter_args_doc[] = N_("[~]NAME [ARGS] [+ [~]NAME [ARGS]...]");
static int filter_mode = MU_FILTER_ENCODE;
static int newline_option = 0;
static int list_option;
static void
set_encode_mode (struct mu_parseopt *po, struct mu_option *opt,
char const *arg)
{
filter_mode = MU_FILTER_ENCODE;
}
static void
set_decode_mode (struct mu_parseopt *po, struct mu_option *opt,
char const *arg)
{
filter_mode = MU_FILTER_DECODE;
}
static struct mu_option filter_options[] = {
{ "encode", 'e', NULL, MU_OPTION_DEFAULT,
N_("encode the input (default)"),
mu_c_string, NULL, set_encode_mode },
{ "decode", 'd', NULL, MU_OPTION_DEFAULT,
N_("decode the input"),
mu_c_string, NULL, set_decode_mode },
{ "newline", 'n', NULL, MU_OPTION_DEFAULT,
N_("print additional newline"),
mu_c_bool, &newline_option },
{ "list", 'L', NULL, MU_OPTION_DEFAULT,
N_("list supported filters"),
mu_c_bool, &list_option },
MU_OPTION_END
};
static int
filter_printer (void *item, void *data)
{
mu_filter_record_t rec = item;
printf ("%s\n", rec->name);
return 0;
}
static int
list_filters (void)
{
mu_list_t list;
int rc = mu_filter_get_list (&list);
if (rc)
{
mu_diag_funcall (MU_DIAG_ERROR, "mu_filter_get_list", NULL, rc);
return 1;
}
return mu_list_foreach (list, filter_printer, NULL);
}
static int
negate_filter_mode (int mode)
{
if (mode == MU_FILTER_DECODE)
return MU_FILTER_ENCODE;
else if (mode == MU_FILTER_ENCODE)
return MU_FILTER_DECODE;
abort ();
}
int
main (int argc, char **argv)
{
int rc;
mu_stream_t flt, prev_stream;
const char *fltname;
int mode;
mu_action_getopt (&argc, &argv, filter_options, filter_docstring,
filter_args_doc);
if (list_option)
{
if (argc)
{
mu_error (_("excess arguments"));
return 1;
}
return list_filters ();
}
if (argc == 0)
{
mu_error (_("what filter do you want?"));
return 1;
}
prev_stream = mu_strin;
mu_stream_ref (mu_strin);
do
{
int i;
fltname = argv[0];
if (fltname[0] == '~')
{
mode = negate_filter_mode (filter_mode);
fltname++;
}
else
mode = filter_mode;
for (i = 1; i < argc; i++)
if (strcmp (argv[i], "+") == 0)
break;
rc = mu_filter_create_args (&flt, prev_stream, fltname,
i, (const char **)argv,
mode, MU_STREAM_READ);
mu_stream_unref (prev_stream);
if (rc)
{
mu_error (_("cannot open filter stream: %s"), mu_strerror (rc));
return 1;
}
prev_stream = flt;
argc -= i;
argv += i;
if (argc)
{
argc--;
argv++;
}
}
while (argc);
rc = mu_stream_copy (mu_strout, flt, 0, NULL);
if (rc)
{
mu_error ("%s", mu_strerror (rc));
return 1;
}
if (newline_option)
mu_stream_write (mu_strout, "\n", 1, NULL);
mu_stream_destroy (&flt);
mu_stream_flush (mu_strout);
return 0;
}
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