init commit

1 files changed, 207 insertions, 0 deletions

diff --git a/tui.c b/tui.c
new file mode 100644
index 0000000..37bb4c6
--- /dev/null
+++ b/tui.c
@@ -0,0 +1,207 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <termios.h>
+
+#include "tui.h"
+
+struct termios term;
+
+unsigned get_term_width() {
+	struct winsize w;
+	ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
+
+	return w.ws_col;
+}
+
+unsigned get_term_height() {
+	struct winsize w;
+	ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
+
+	return w.ws_row;
+}
+
+unsigned get_cursor_x_position() {
+	printf("\033[6n");
+	char buf[32];
+	unsigned n;
+	unsigned m;
+	unsigned x;
+
+	for (char * c = buf; c < buf + 32; ++c) {
+		*c = getch();
+
+		if (*c == 'R') {
+			m = c - buf;
+			break;
+		} else if (*c == ';') {
+			n = c - buf;
+		}
+	}
+
+	x = 0;
+
+	for (int i = m - 1; i > n; --i) {
+		int p = 1;
+
+		for (int j = 0; j < m - 1 - i; ++j)
+			p *= 10;
+
+		x += ((int)buf[i] - 48) * p;
+	}
+
+	return x;
+}
+
+unsigned get_cursor_y_position() {
+	printf("\033[6n");
+	char buf[32];
+	unsigned n;
+	unsigned y;
+	unsigned was_echo = is_echo();
+
+	showecho(0);
+
+	for (char * c = buf; c < buf + 32; ++c) {
+		*c = getch();
+
+		if (*c == 'R') {
+			break;
+		} else if (*c == ';') {
+			n = c - buf;
+		}
+	}
+
+	showecho(was_echo);
+
+	y = 0;
+
+	for (int i = n - 1; i > 1; --i) {
+		int p = 1;
+
+		for (int j = 0; j < n - 1 - i; ++j)
+			p *= 10;
+
+		y += ((int)buf[i] - 48) * p;
+	}
+
+	return y;
+}
+
+void inittui() {
+	printf("\033[?1049h");
+	tcgetattr(fileno(stdin), &term);
+}
+
+void endtui() {
+	printf("\033[?1049l");
+}
+
+char getch() {
+	char c;
+	term.c_lflag &= ~ICANON;
+
+	tcsetattr(fileno(stdin), TCSANOW, &term);
+	c = getc(stdin);
+
+	term.c_lflag |= ICANON;
+	tcsetattr(fileno(stdin), TCSANOW, &term);
+	return c;
+}
+
+void showecho(int echo) {
+	if (!echo)
+		term.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
+	else
+		term.c_lflag |= ECHO | ECHOE | ECHOK | ECHONL;
+	tcsetattr(fileno(stdin), TCSANOW, &term);
+}
+
+int is_echo() {
+	return term.c_iflag & ECHO;
+}
+
+void showcursor(int show) {
+	printf("\033[?25%c", show ? 'h' : 'l');
+}
+
+void printfxy(unsigned x, unsigned y, const char * fmt, ...) {
+	va_list list;
+
+	printf("\033[%d;%dH", y, x);
+
+	va_start(list, fmt);
+	vprintf(fmt, list);
+	va_end(list);
+}
+
+void draw_window(Window * win) {
+	for (int i = 0; i < win->height; ++i)
+		printfxy(win->x, win->y + i, "%*s", win->width, "");
+
+	if (win->has_borders) {
+		printfxy(win->x, win->y, "%s", TLCORNER);
+		for (int i = 1; i < win->width - 1; ++i)
+			printfxy(win->x + i, win->y, "%s", HLINE);
+		printfxy(win->x + win->width - 1, win->y, "%s", TRCORNER);
+
+		printfxy(win->x, win->y + win->height - 1, "%s", BLCORNER);
+		for (int i = 1; i < win->width - 1; ++i)
+			printfxy(win->x + i, win->y + win->height - 1, "%s", HLINE);
+		printfxy(win->x + win->width - 1, win->y + win->height - 1, "%s", BRCORNER);
+
+		for (int i = 1; i < win->height - 1; ++i)
+			printfxy(win->x, win->y + i, "%s", VLINE);
+
+		for (int i = 1; i < win->height - 1; ++i)
+			printfxy(win->x + win->width - 1, win->y + i, "%s", VLINE);
+	}
+
+	fflush(stdout);
+}
+
+void printfxy_to_window(Window * win, int x, int y, const char * fmt, ...) {
+	va_list list;
+	char buf[BUFSIZ];
+	int cx;
+	int cy;
+	int tabstop = 0;
+
+	va_start(list, fmt);
+	vsprintf(buf, fmt, list);
+	va_end(list);
+
+	cx = x + win->x + win->has_borders;
+	cy = y + win->y + win->has_borders;
+
+	if (cy >= (int)(win->y + win->height - win->has_borders))
+		return;
+
+	printf("\033[%d;%dH", cy, cx);
+
+	for (char * c = buf; *c;) {
+		if (*c == '\t') {
+			tabstop = 3;
+			*c = ' ';
+		}
+
+		if (*c == '\n' || cx == win->x + win->width - win->has_borders) {
+			if (++cy >= (int)(win->y + win->height - win->has_borders))
+				break;
+			cx = win->x + win->has_borders;
+			printf("\033[%d;%dH", cy, cx);
+		}
+
+		if (*c != '\n') {
+			if (cy >= (int)(win->y + win->has_borders))
+				putc(*c, stdout);
+			++cx;
+		}
+
+		if (tabstop)
+			--tabstop;
+		else
+			++c;
+	}
+}