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/* parc
* Copyright (C) 2025 Ekaitz Zarraga <ekaitz@elenq.tech>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* XTERM escape sequence reference:
* https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
* Good summary:
* https://en.wikipedia.org/wiki/ANSI_escape_code
*
* also:
* man console_codes
*/
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <string.h>
#include "tui-internals.h"
#define ESC '\x1b'
const char CSI_LEAD[3] = { ESC, '[', '\0'};
void
tui_cursor_save (void)
{
printf ("%ss", CSI_LEAD);
fflush (stdout);
}
void
tui_cursor_restore (void)
{
printf ("%su", CSI_LEAD);
fflush (stdout);
}
void
tui_mouse_enable (void)
{
printf ("%s?1000h", CSI_LEAD);
fflush (stdout);
}
void
tui_mouse_disable (void)
{
printf ("%s?1000l", CSI_LEAD);
fflush (stdout);
}
void
tui_cursor_move (int x, int y)
{
/*
* Also valid with CSI<L>;<C>f being <L> and <C> line number and column
* number respectively. In ttys, cursor starts at 1,1
*/
printf ("%s%d;%dH", CSI_LEAD, y, x);
fflush (stdout);
}
void
tui_cursor_show (void)
{
printf ("%s?25h", CSI_LEAD);
fflush (stdout);
}
void
tui_cursor_hide (void)
{
printf ("%s?25l", CSI_LEAD);
fflush (stdout);
}
void
tui_screen_erase (void)
{
printf ("%s2J", CSI_LEAD);
fflush (stdout);
}
void
tui_alternate_buffer_enable (void)
{
printf ("%s?1049h", CSI_LEAD);
fflush (stdout);
}
void
tui_alternate_buffer_disable (void)
{
printf ("%s?1049l", CSI_LEAD);
fflush (stdout);
}
tui *
tui_create (void)
{
tui *ui = malloc (sizeof *ui);
/* Get interface configuration to reset it later */
tcgetattr (0, &ui->term_old_config);
/* Get interface configuration to edit */
tcgetattr (0, &ui->term_config);
/* Set the new configuration */
ui->term_config.c_lflag &= ~ (ECHO | ECHONL | ICANON | IEXTEN | ISIG);
ui->term_config.c_cc[VMIN] = 1; /* Wait until 1 character is in buffer */
ui->term_config.c_cc[VTIME] = 0; /* Wait indefinitely */
/* TCSANOW makes the change occur immediately */
tcsetattr (0, TCSANOW, &ui->term_config);
tui_alternate_buffer_enable ();
tui_cursor_move (0, 0);
tui_mouse_enable ();
return ui;
}
void
tui_destroy (tui *ui)
{
/* Set old configuration again and exit. */
/* If it's not set back the normal configuration of the */
/* terminal will be broken later! */
tcsetattr (0, TCSANOW, &ui->term_old_config);
tui_alternate_buffer_disable ();
free (ui);
}
void
tui_input_sequence_consume (void)
{
int c, x, y;
c = getchar ();
if (ESC == c)
{
/* TODO: parse escape sequence */
c = getchar ();
if (c == '[')
{
c = getchar ();
switch (c)
{
case 'M':
/*https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Normal-tracking-mode*/
/* They add 32 to the coordinates */
c = getchar () - 32;
x = getchar () - 32;
y = getchar () - 32;
printf ("%d, %d, %d\n", c, x, y);
break;
case 'I':
/* Gained focus */
break;
case 'O':
/* Lost focus */
break;
default:
break;
}
}
}
else
;
/* return key event */
}
void
tui_loop (tui *ui)
{
char input_buf [100];
memset (input_buf, 0, 100);
while (1)
{
tui_input_sequence_consume ();
}
}
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