1 /* GNU Mailutils -- a suite of utilities for electronic mail
2 Copyright (C) 2010-2021 Free Software Foundation, Inc.
3
4 GNU Mailutils is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
7 any later version.
8
9 GNU Mailutils is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
16
17 #if defined(HAVE_CONFIG_H)
18 # include <config.h>
19 #endif
20 #include <stdlib.h>
21 #include <string.h>
22 #include <mailutils/mailutils.h>
23 #include "mu.h"
24
25 char filter_docstring[] = N_("apply a chain of filters to the input");
26 static char filter_args_doc[] = N_("[~]NAME [ARGS] [+ [~]NAME [ARGS]...]");
27
28 static int filter_mode = MU_FILTER_ENCODE;
29 static int newline_option = 0;
30 static int list_option;
31
32 static void
set_encode_mode(struct mu_parseopt * po,struct mu_option * opt,char const * arg)33 set_encode_mode (struct mu_parseopt *po, struct mu_option *opt,
34 char const *arg)
35 {
36 filter_mode = MU_FILTER_ENCODE;
37 }
38
39 static void
set_decode_mode(struct mu_parseopt * po,struct mu_option * opt,char const * arg)40 set_decode_mode (struct mu_parseopt *po, struct mu_option *opt,
41 char const *arg)
42 {
43 filter_mode = MU_FILTER_DECODE;
44 }
45
46 static struct mu_option filter_options[] = {
47 { "encode", 'e', NULL, MU_OPTION_DEFAULT,
48 N_("encode the input (default)"),
49 mu_c_string, NULL, set_encode_mode },
50 { "decode", 'd', NULL, MU_OPTION_DEFAULT,
51 N_("decode the input"),
52 mu_c_string, NULL, set_decode_mode },
53 { "newline", 'n', NULL, MU_OPTION_DEFAULT,
54 N_("print additional newline"),
55 mu_c_bool, &newline_option },
56 { "list", 'L', NULL, MU_OPTION_DEFAULT,
57 N_("list supported filters"),
58 mu_c_bool, &list_option },
59 MU_OPTION_END
60 };
61
62 static int
filter_printer(void * item,void * data)63 filter_printer (void *item, void *data)
64 {
65 mu_filter_record_t rec = item;
66 printf ("%s\n", rec->name);
67 return 0;
68 }
69
70 static int
list_filters(void)71 list_filters (void)
72 {
73 mu_list_t list;
74 int rc = mu_filter_get_list (&list);
75
76 if (rc)
77 {
78 mu_diag_funcall (MU_DIAG_ERROR, "mu_filter_get_list", NULL, rc);
79 return 1;
80 }
81 return mu_list_foreach (list, filter_printer, NULL);
82 }
83
84 static int
negate_filter_mode(int mode)85 negate_filter_mode (int mode)
86 {
87 if (mode == MU_FILTER_DECODE)
88 return MU_FILTER_ENCODE;
89 else if (mode == MU_FILTER_ENCODE)
90 return MU_FILTER_DECODE;
91 abort ();
92 }
93
94 int
main(int argc,char ** argv)95 main (int argc, char **argv)
96 {
97 int rc;
98 mu_stream_t flt, prev_stream;
99 const char *fltname;
100 int mode;
101
102 mu_action_getopt (&argc, &argv, filter_options, filter_docstring,
103 filter_args_doc);
104
105 if (list_option)
106 {
107 if (argc)
108 {
109 mu_error (_("excess arguments"));
110 return 1;
111 }
112 return list_filters ();
113 }
114
115 if (argc == 0)
116 {
117 mu_error (_("what filter do you want?"));
118 return 1;
119 }
120
121 prev_stream = mu_strin;
122 mu_stream_ref (mu_strin);
123 do
124 {
125 int i;
126
127 fltname = argv[0];
128 if (fltname[0] == '~')
129 {
130 mode = negate_filter_mode (filter_mode);
131 fltname++;
132 }
133 else
134 mode = filter_mode;
135
136 for (i = 1; i < argc; i++)
137 if (strcmp (argv[i], "+") == 0)
138 break;
139
140 rc = mu_filter_create_args (&flt, prev_stream, fltname,
141 i, (const char **)argv,
142 mode, MU_STREAM_READ);
143 mu_stream_unref (prev_stream);
144 if (rc)
145 {
146 mu_error (_("cannot open filter stream: %s"), mu_strerror (rc));
147 return 1;
148 }
149 prev_stream = flt;
150 argc -= i;
151 argv += i;
152 if (argc)
153 {
154 argc--;
155 argv++;
156 }
157 }
158 while (argc);
159
160 rc = mu_stream_copy (mu_strout, flt, 0, NULL);
161
162 if (rc)
163 {
164 mu_error ("%s", mu_strerror (rc));
165 return 1;
166 }
167
168 if (newline_option)
169 mu_stream_write (mu_strout, "\n", 1, NULL);
170
171 mu_stream_destroy (&flt);
172 mu_stream_flush (mu_strout);
173
174 return 0;
175 }
176