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// <poll.h> might need this for sigset_t
#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <unistd.h>
#include <locale.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <poll.h>
#include <signal.h>
#include <curses.h>
#include "termo.h"
typedef struct app_context app_context_t;
struct app_context
{
termo_t *tk;
// Current attributes for the left mouse button
int current_attrs_left;
// Current attributes for the right mouse button
int current_attrs_right;
};
static int g_winch_pipe[2];
static void
display (const char *format, ...)
{
va_list ap;
mvwhline (stdscr, 0, 0, A_REVERSE, COLS);
attron (A_REVERSE);
va_start (ap, format);
vw_printw (stdscr, format, ap);
va_end (ap);
attroff (A_REVERSE);
refresh ();
}
static void
init_palette (app_context_t *app)
{
start_color ();
// Also does init_pair (0, -1, -1);
use_default_colors ();
// Duplicate it for convenience.
init_pair (9, -1, -1);
// Add the basic 8 colors to the default pair. Once normally, once
// inverted to workaround VTE's inability to set a bright background.
for (int i = 0; i < 8; i++)
{
init_pair (1 + i, COLOR_WHITE, COLOR_BLACK + i);
init_pair (10 + i, COLOR_BLACK + i, COLOR_WHITE);
}
// This usually creates a solid black or white.
app->current_attrs_left =
app->current_attrs_right = COLOR_PAIR (9) | A_REVERSE | A_BOLD;
}
static void
redraw (void)
{
int i;
mvwhline (stdscr, 1, 0, A_REVERSE, COLS);
mvwhline (stdscr, 2, 0, A_REVERSE, COLS);
for (i = 0; i < COLS; i++)
{
int pair = (float) i / COLS * 9;
mvaddch (1, i, ' ' | COLOR_PAIR (pair));
mvaddch (2, i, ' ' | COLOR_PAIR (pair + 9) | A_REVERSE | A_BOLD);
}
display ("Choose a color from the palette and draw. "
"Press Escape or ^C to quit.");
refresh ();
}
static bool
on_key (app_context_t *app, termo_key_t *key)
{
if (key->type == TERMO_TYPE_KEYSYM
&& key->code.sym == TERMO_SYM_ESCAPE)
return false;
if (key->type == TERMO_TYPE_KEY
&& (key->modifiers & TERMO_KEYMOD_CTRL)
&& (key->code.codepoint == 'C' || key->code.codepoint == 'c'))
return false;
if (key->type != TERMO_TYPE_MOUSE)
return true;
int line, col, button;
termo_mouse_event_t event;
termo_interpret_mouse (app->tk, key, &event, &button, &line, &col);
if (event != TERMO_MOUSE_PRESS && event != TERMO_MOUSE_DRAG)
return true;
int *attrs;
if (button == 1)
attrs = &app->current_attrs_left;
else if (button == 3)
attrs = &app->current_attrs_right;
else
return true;
chtype ch = mvwinch (stdscr, line, col);
if (line >= 3)
{
// Paste the attributes where the user clicked.
addch (' ' | *attrs);
refresh ();
}
else if (line > 0)
// Copy attributes from the pallete.
*attrs = ch & (A_COLOR | A_ATTRIBUTES);
return true;
}
static void
winch_handler (int signum)
{
(void) signum;
write (g_winch_pipe[1], "x", 1);
}
int
main (int argc, char *argv[])
{
(void) argc;
(void) argv;
TERMO_CHECK_VERSION;
setlocale (LC_CTYPE, "");
struct sigaction act;
act.sa_handler = winch_handler;
act.sa_flags = SA_RESTART;
sigemptyset (&act.sa_mask);
// Set up a self-pipe so that we can actually poll on SIGWINCH
if (sigaction (SIGWINCH, &act, NULL) || pipe (g_winch_pipe))
{
fprintf (stderr, "Cannot set up signal handler\n");
exit (EXIT_FAILURE);
}
termo_t *tk = termo_new (STDIN_FILENO, NULL, 0);
if (!tk)
{
fprintf (stderr, "Cannot allocate termo instance\n");
exit (EXIT_FAILURE);
}
termo_set_mouse_tracking_mode (tk, TERMO_MOUSE_TRACKING_DRAG);
// Set up curses for our drawing needs
if (!initscr () || nonl () == ERR || curs_set (0) == ERR)
{
fprintf (stderr, "Cannot initialize curses\n");
exit (EXIT_FAILURE);
}
app_context_t app;
memset (&app, 0, sizeof app);
app.tk = tk;
init_palette (&app);
redraw ();
termo_result_t ret;
termo_key_t key;
// We listen for mouse/key input and terminal resize events
struct pollfd fds[2] =
{
{ .fd = STDIN_FILENO, .events = POLLIN },
{ .fd = g_winch_pipe[0], .events = POLLIN },
};
// Run a simple event loop with poll()
int nextwait = -1;
bool running = true;
while (running)
{
if (!poll (fds, 2, nextwait))
if (termo_getkey_force (tk, &key) == TERMO_RES_KEY)
running &= on_key (&app, &key);
if (fds[1].revents & (POLLIN | POLLHUP | POLLERR))
{
char x;
read (fds[1].fd, &x, 1);
// The "official" simple and flicker-prone method of resizing
// the internal buffers of curses
endwin ();
refresh ();
redraw ();
}
if (fds[0].revents & (POLLIN | POLLHUP | POLLERR))
termo_advisereadable (tk);
while ((ret = termo_getkey (tk, &key)) == TERMO_RES_KEY)
running &= on_key (&app, &key);
nextwait = -1;
if (ret == TERMO_RES_AGAIN)
nextwait = termo_get_waittime (tk);
}
endwin ();
termo_destroy (tk);
}
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