Rename the project
This commit is contained in:
274
src/sdtui.c
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274
src/sdtui.c
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/*
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* StarDict terminal UI
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*
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* Copyright (c) 2013, Přemysl Janouch <p.janouch@gmail.com>
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* All rights reserved.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#define _XOPEN_SOURCE_EXTENDED /**< Yes, we want ncursesw. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <locale.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <glib.h>
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#include <gio/gio.h>
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#include <ncurses.h>
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#include <unistd.h>
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#include <poll.h>
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#include <errno.h>
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#include <signal.h>
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#include "stardict.h"
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#define KEY_ESCAPE 27 /**< Curses doesn't define this. */
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// --- Utilities ---------------------------------------------------------------
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static void
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display (const gchar *format, ...)
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{
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va_list ap;
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va_start (ap, format);
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vw_printw (stdscr, format, ap);
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va_end (ap);
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refresh ();
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}
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static gchar *
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wchar_to_mb (wchar_t ch)
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{
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/* Convert the character back to a multi-byte sequence. */
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static gchar buffer[MB_LEN_MAX + 1];
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size_t len = wcrtomb (buffer, ch, NULL);
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/* This shouldn't happen. It would mean that the user has
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* somehow managed to enter something inexpressable in the
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* current locale. */
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if (len == (size_t) -1)
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abort ();
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/* Here I hope the buffer doesn't overflow. Who uses
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* shift states nowadays, anyway? */
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if (wcrtomb (buffer + len, L'\0', NULL) == (size_t) -1)
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abort ();
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return buffer;
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}
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static const gchar *
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wchar_to_mb_escaped (wchar_t ch)
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{
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switch (ch)
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{
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case L'\r': return "\\r";
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case L'\n': return "\\n";
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case L'\t': return "\\t";
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default: return wchar_to_mb (ch);
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}
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}
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static int
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poll_restart (struct pollfd *fds, nfds_t nfds, int timeout)
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{
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int ret;
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do
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ret = poll (fds, nfds, timeout);
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while (ret == -1 && errno == EINTR);
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return ret;
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}
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// --- SIGWINCH ----------------------------------------------------------------
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static int g_winch_pipe[2]; /**< SIGWINCH signalling pipe. */
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static void (*g_old_winch_handler) (int);
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static void
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winch_handler (int signum)
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{
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/* Call the ncurses handler. */
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if (g_old_winch_handler)
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g_old_winch_handler (signum);
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/* And wake up the poll() call. */
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write (g_winch_pipe[1], "x", 1);
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}
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static void
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install_winch_handler (void)
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{
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struct sigaction act, oldact;
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act.sa_handler = winch_handler;
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act.sa_flags = SA_RESTART;
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sigemptyset (&act.sa_mask);
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sigaction (SIGWINCH, &act, &oldact);
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/* Save the ncurses handler. */
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if (oldact.sa_handler != SIG_DFL
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&& oldact.sa_handler != SIG_IGN)
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g_old_winch_handler = oldact.sa_handler;
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}
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// --- Event handlers ----------------------------------------------------------
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typedef struct
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{
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wint_t code;
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guint is_char : 1;
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MEVENT mouse;
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}
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CursesEvent;
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static gboolean
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process_curses_event (CursesEvent *event)
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{
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if (!event->is_char)
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{
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switch (event->code)
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{
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case KEY_RESIZE:
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display ("Screen has been resized to %u x %u\n",
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COLS, LINES);
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break;
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case KEY_MOUSE:
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display ("Mouse event at (%d, %d), state %#lx\n",
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event->mouse.x, event->mouse.y, event->mouse.bstate);
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break;
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default:
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display ("Keyboard event: non-character: %u\n",
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event->code);
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}
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return TRUE;
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}
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display ("Keyboard event: character: '%s'\n",
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wchar_to_mb_escaped (event->code));
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if (event->code == L'q' || event->code == KEY_ESCAPE)
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{
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display ("Quitting...\n");
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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process_stdin_input (void)
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{
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CursesEvent event;
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int sta;
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while ((sta = get_wch (&event.code)) != ERR)
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{
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event.is_char = (sta == OK);
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if (sta == KEY_CODE_YES && event.code == KEY_MOUSE
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&& getmouse (&event.mouse) == ERR)
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abort ();
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if (!process_curses_event (&event))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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process_winch_input (int fd)
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{
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char c;
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read (fd, &c, 1);
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return process_stdin_input ();
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}
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// --- Main --------------------------------------------------------------------
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int
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main (int argc, char *argv[])
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{
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static GOptionEntry entries[] =
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{
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{ NULL }
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};
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if (!setlocale (LC_ALL, ""))
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abort ();
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GError *error = NULL;
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GOptionContext *ctx = g_option_context_new ("- StarDict terminal UI");
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g_option_context_add_main_entries (ctx, entries, NULL);
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if (!g_option_context_parse (ctx, &argc, &argv, &error))
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{
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g_printerr ("Error: option parsing failed: %s\n", error->message);
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exit (EXIT_FAILURE);
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}
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if (!initscr ()
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|| cbreak () == ERR
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|| noecho () == ERR)
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abort ();
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keypad (stdscr, TRUE); /* Enable character processing. */
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nodelay (stdscr, TRUE); /* Don't block on get_wch(). */
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mousemask (ALL_MOUSE_EVENTS, NULL);
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display ("Press Q, Escape or ^C to quit\n");
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if (pipe (g_winch_pipe) == -1)
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abort ();
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install_winch_handler ();
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// --- Message loop ------------------------------------------------------------
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struct pollfd pollfd[2];
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pollfd[0].fd = fileno (stdin);
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pollfd[0].events = POLLIN;
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pollfd[1].fd = g_winch_pipe[0];
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pollfd[1].events = POLLIN;
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while (TRUE)
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{
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if (poll_restart (pollfd, 3, -1) == -1)
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abort ();
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if ((pollfd[0].revents & POLLIN)
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&& !process_stdin_input ())
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break;
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if ((pollfd[1].revents & POLLIN)
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&& !process_winch_input (pollfd[2].fd))
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break;
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}
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// --- Cleanup -----------------------------------------------------------------
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endwin ();
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if (close (g_winch_pipe[0]) == -1
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|| close (g_winch_pipe[1]) == -1)
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abort ();
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return 0;
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}
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