src/screen_chat.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2017 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "screen_chat.h"
  21
  22 #include "screen_interface.h"
  23 #include "screen_utils.h"
  24 #include "screen_status.h"
  25 #include "screen_text.h"
  26 #include "mpdclient.h"
  27 #include "i18n.h"
  28 #include "charset.h"
  29 #include "options.h"
  30
  31 #include <glib.h>
  32 #include <mpd/idle.h>
  33
  34 static struct screen_text text; /* rename? */
  35 static const char chat_channel[] = "chat";
  36
  37 static bool
  38 check_chat_support(struct mpdclient *c)
  39 {
  40         static unsigned last_connection_id = 0;
  41         static bool was_supported = false;
  42
  43         /* if we're using the same connection as the last time
  44            check_chat_support was called, we can use the cached information
  45            about whether chat is supported */
  46         if (c->connection_id == last_connection_id)
  47                 return was_supported;
  48
  49         last_connection_id = c->connection_id;
  50
  51         if (c->connection == NULL)
  52                 return (was_supported = false);
  53
  54         if (mpd_connection_cmp_server_version(c->connection, 0, 17, 0) == -1) {
  55                 const unsigned *version = mpd_connection_get_server_version(c->connection);
  56                 char *str;
  57
  58                 str = g_strdup_printf(
  59                         _("connected to MPD %u.%u.%u (you need at least \n"
  60                           "version 0.17.0 to use the chat feature)"),
  61                         version[0], version[1], version[2]);
  62                 screen_text_append(&text, str);
  63                 g_free(str);
  64
  65                 return (was_supported = false);
  66         }
  67
  68         /* mpdclient_get_connection? */
  69         if (!mpdclient_cmd_subscribe(c, chat_channel))
  70                 return (was_supported = false);
  71         /* mpdclient_put_connection? */
  72
  73         return (was_supported = true);
  74 }
  75
  76 static void
  77 screen_chat_init(WINDOW *w, unsigned cols, unsigned rows)
  78 {
  79         screen_text_init(&text, w, cols, rows);
  80 }
  81
  82 static void
  83 screen_chat_exit(void)
  84 {
  85         screen_text_deinit(&text);
  86 }
  87
  88 static void
  89 screen_chat_open(struct mpdclient *c)
  90 {
  91         (void) check_chat_support(c);
  92 }
  93
  94 static void
  95 screen_chat_resize(unsigned cols, unsigned rows)
  96 {
  97         screen_text_resize(&text, cols, rows);
  98 }
  99
 100 static void
 101 screen_chat_paint(void)
 102 {
 103         screen_text_paint(&text);
 104 }
 105
 106 static void
 107 process_message(struct mpd_message *message)
 108 {
 109         assert(message != NULL);
 110         /* You'll have to move this out of screen_chat, if you want to use
 111            client-to-client messages anywhere else */
 112         assert(g_strcmp0(mpd_message_get_channel(message), chat_channel) == 0);
 113
 114         char *message_text = utf8_to_locale(mpd_message_get_text(message));
 115         screen_text_append(&text, message_text);
 116         g_free(message_text);
 117
 118         screen_chat_paint();
 119 }
 120
 121 static void
 122 screen_chat_update(struct mpdclient *c)
 123 {
 124         if (check_chat_support(c) && (c->events & MPD_IDLE_MESSAGE)) {
 125                 if (!mpdclient_send_read_messages(c))
 126                         return;
 127
 128                 struct mpd_message *message;
 129                 while ((message = mpdclient_recv_message(c)) != NULL) {
 130                         process_message(message);
 131                         mpd_message_free(message);
 132                 }
 133
 134                 mpdclient_finish_command(c);
 135
 136                 c->events &= ~MPD_IDLE_MESSAGE;
 137         }
 138 }
 139
 140 static char *
 141 screen_chat_get_prefix(void)
 142 {
 143         static char *prefix = NULL;
 144
 145         if (prefix)
 146                 return prefix;
 147
 148         if (options.chat_prefix) {
 149                 /* Options are encoded in the "locale" charset */
 150                 prefix = locale_to_utf8(options.chat_prefix);
 151                 return prefix;
 152         }
 153
 154         prefix = g_strconcat("<", g_get_user_name(), "> ", NULL);
 155         return prefix;
 156 }
 157
 158 static void
 159 screen_chat_send_message(struct mpdclient *c, char *msg)
 160 {
 161         char *utf8 = locale_to_utf8(msg);
 162         char *prefix = screen_chat_get_prefix();
 163         char *full_msg = g_strconcat(prefix, utf8, NULL);
 164         g_free(utf8);
 165
 166         (void) mpdclient_cmd_send_message(c, chat_channel, full_msg);
 167         g_free(full_msg);
 168 }
 169
 170 static bool
 171 screen_chat_cmd(struct mpdclient *c, command_t cmd)
 172 {
 173         if (screen_text_cmd(&text, c, cmd))
 174                 return true;
 175
 176         if (cmd == CMD_PLAY) {
 177                 char *message = screen_readln(_("Your message"), NULL, NULL, NULL);
 178
 179                 /* the user entered an empty line */
 180                 if (message == NULL)
 181                         return true;
 182
 183                 if (check_chat_support(c))
 184                         screen_chat_send_message(c, message);
 185                 else
 186                         screen_status_message(_("Message could not be sent"));
 187
 188                 g_free(message);
 189
 190                 return true;
 191         }
 192
 193         return false;
 194 }
 195
 196 static const char *
 197 screen_chat_title(gcc_unused char *s, gcc_unused size_t size)
 198 {
 199         return _("Chat");
 200 }
 201
 202 const struct screen_functions screen_chat = {
 203         .init = screen_chat_init,
 204         .exit = screen_chat_exit,
 205         .open = screen_chat_open,
 206         /* close */
 207         .resize = screen_chat_resize,
 208         .paint = screen_chat_paint,
 209         .update = screen_chat_update,
 210         .cmd = screen_chat_cmd,
 211         .get_title = screen_chat_title,
 212 };