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#define _DEFAULT_SOURCE
#include "display.h"
#include "buffer.h"
#include <stdarg.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#define ESC 0x1b
struct display display_create() {
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0) {
// TODO: if it fails to fetch, do something?
return (struct display){
.height = 0,
.width = 0,
};
}
// save old settings
struct termios orig_term;
tcgetattr(0, &orig_term);
// set terminal to raw mode
struct termios term;
cfmakeraw(&term);
// TODO: move to kbd?
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 0;
tcsetattr(0, TCSADRAIN, &term);
return (struct display){
.orig_term = orig_term,
.term = term,
.height = ws.ws_row,
.width = ws.ws_col,
};
}
void display_destroy(struct display *display) {
// reset old terminal mode
tcsetattr(0, TCSADRAIN, &display->orig_term);
}
void putbytes(uint8_t *line_bytes, uint32_t line_length) {
for (uint32_t bytei = 0; bytei < line_length; ++bytei) {
uint8_t byte = line_bytes[bytei];
if (byte == '\t') {
fputs(" ", stdout);
} else {
fputc(byte, stdout);
}
}
}
void putbyte(uint8_t c) { putc(c, stdout); }
void put_ansiparm(int n) {
int q = n / 10;
if (q != 0) {
int r = q / 10;
if (r != 0) {
putbyte((r % 10) + '0');
}
putbyte((q % 10) + '0');
}
putbyte((n % 10) + '0');
}
void display_move_cursor(struct display *display, uint32_t row, uint32_t col) {
putbyte(ESC);
putbyte('[');
put_ansiparm(row + 1);
putbyte(';');
put_ansiparm(col + 1);
putbyte('H');
}
void display_clear(struct display *display) {
display_move_cursor(display, 0, 0);
uint8_t bytes[] = {ESC, '[', 'J'};
putbytes(bytes, 3);
}
void delete_to_eol() {
uint8_t bytes[] = {ESC, '[', 'K'};
putbytes(bytes, 3);
}
struct command_list *command_list_create(uint32_t capacity, alloc_fn allocator,
uint32_t xoffset, uint32_t yoffset) {
struct command_list *command_list = allocator(sizeof(struct command_list));
command_list->capacity = capacity;
command_list->ncmds = 0;
command_list->xoffset = xoffset;
command_list->yoffset = yoffset;
command_list->format_len = 0;
command_list->cmds = allocator(sizeof(struct render_command) * capacity);
return command_list;
}
void push_format(struct command_list *list, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
if (list->format_len == 0) {
list->format[0] = ESC;
list->format[1] = '[';
list->format_len = 2;
}
if (list->format_len > 2) {
list->format[list->format_len] = ';';
++list->format_len;
}
uint32_t format_space_left = sizeof(list->format) - 1 - list->format_len;
list->format_len += vsnprintf((char *)(list->format + list->format_len),
format_space_left, fmt, args);
va_end(args);
}
void flush_format(struct command_list *list, uint32_t col, uint32_t row) {
list->format[list->format_len] = 'm';
++list->format_len;
struct render_command *cmd = &list->cmds[list->ncmds];
cmd->data = list->format;
cmd->col = col + list->xoffset;
cmd->row = row + list->yoffset;
cmd->len = list->format_len;
list->format_len = 0;
++list->ncmds;
}
void command_list_draw_text(struct command_list *list, uint32_t col,
uint32_t row, uint8_t *data, uint32_t len) {
uint32_t needed_capacity = list->ncmds + 1;
if (list->format_len > 0) {
++needed_capacity;
}
if (needed_capacity > list->capacity) {
// TODO: better
return;
}
if (list->format_len > 0) {
flush_format(list, col, row);
}
struct render_command *cmd = &list->cmds[list->ncmds];
cmd->data = data;
cmd->col = col + list->xoffset;
cmd->row = row + list->yoffset;
cmd->len = len;
++list->ncmds;
}
void command_list_set_index_color_fg(struct command_list *list,
uint8_t color_idx) {
if (color_idx < 8) {
push_format(list, "%d", 30 + color_idx);
} else if (color_idx < 16) {
push_format(list, "%d", 90 + color_idx);
} else {
push_format(list, "30;5;%d", color_idx);
}
}
void command_list_set_color_fg(struct command_list *list, uint8_t red,
uint8_t green, uint8_t blue) {
push_format(list, "30;2;%d;%d;%d", red, green, blue);
}
void command_list_set_index_color_bg(struct command_list *list,
uint8_t color_idx) {
if (color_idx < 8) {
push_format(list, "%d", 40 + color_idx);
} else if (color_idx < 16) {
push_format(list, "%d", 100 + color_idx);
} else {
push_format(list, "40;5;%d", color_idx);
}
}
void command_list_set_color_bg(struct command_list *list, uint8_t red,
uint8_t green, uint8_t blue) {
push_format(list, "40;2;%d;%d;%d", red, green, blue);
}
void command_list_reset_color(struct command_list *list) {
push_format(list, "0");
}
void display_render(struct display *display,
struct command_list *command_list) {
struct command_list *cl = command_list;
for (uint64_t cmdi = 0; cmdi < cl->ncmds; ++cmdi) {
struct render_command *cmd = &cl->cmds[cmdi];
display_move_cursor(display, cmd->row, cmd->col);
putbytes(cmd->data, cmd->len);
delete_to_eol();
}
}
void display_begin_render(struct display *display) {}
void display_end_render(struct display *display) { fflush(stdout); }
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