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6a41be243791d698ce822ad0ddde0cafb594906c
BoredOS/src/kernel/userland/markdown.c
boreddevnl 6a41be2437 task manager and major memory stability fixes
2026-03-10 18:12:57 +01:00

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// Copyright (c) 2023-2026 Chris (boreddevnl)
// This software is released under the GNU General Public License v3.0. See LICENSE file for details.
// This header needs to maintain in any file it is present in, as per the GPL license terms.
#include "libc/syscall.h"
#include "libc/libui.h"
#include "libc/stdlib.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#define MD_MAX_CONTENT 16384
#define MD_MAX_LINES 256
#define MD_CHAR_WIDTH 8
#define MD_LINE_HEIGHT 16
#define COLOR_DARK_PANEL 0xFF202020
#define COLOR_DARK_BG 0xFF121212
#define COLOR_DARK_TEXT 0xFFE0E0E0
#define COLOR_DARK_TITLEBAR 0xFF303030
#define COLOR_BLACK 0xFF000000
typedef enum {
MD_LINE_NORMAL,
MD_LINE_HEADING1,
MD_LINE_HEADING2,
MD_LINE_HEADING3,
MD_LINE_BOLD,
MD_LINE_ITALIC,
MD_LINE_LIST,
MD_LINE_BLOCKQUOTE,
MD_LINE_CODE
} MDLineType;
typedef struct {
char content[256];
int length;
MDLineType type;
int indent_level;
} MDLine;
static MDLine lines[MD_MAX_LINES];
static int line_count = 0;
static int scroll_top = 0;
static char open_filename[256] = "";
static int win_w = 600;
static int win_h = 400;
static size_t md_strlen(const char *str) {
size_t len = 0;
while (str[len]) len++;
return len;
}
static void md_strcpy(char *dest, const char *src) {
while (*src) *dest++ = *src++;
*dest = 0;
}
static int md_strncpy(char *dest, const char *src, int n) {
int i = 0;
while (i < n && src[i]) {
dest[i] = src[i];
i++;
}
dest[i] = 0;
return i;
}
static void md_parse_line(const char *raw_line, char *output, MDLineType *type, int *indent) {
int i = 0;
int out_idx = 0;
*indent = 0;
*type = MD_LINE_NORMAL;
while (raw_line[i] == ' ' || raw_line[i] == '\t') {
if (raw_line[i] == '\t') *indent += 2;
else *indent += 1;
i++;
}
if (raw_line[i] == '#') {
int hash_count = 0;
while (raw_line[i] == '#') {
hash_count++;
i++;
}
if (raw_line[i] == ' ') i++;
if (hash_count == 1) *type = MD_LINE_HEADING1;
else if (hash_count == 2) *type = MD_LINE_HEADING2;
else if (hash_count <= 6) *type = MD_LINE_HEADING3;
} else if (raw_line[i] == '-' || raw_line[i] == '*') {
if ((raw_line[i] == '-' || raw_line[i] == '*') && (raw_line[i+1] == ' ' || raw_line[i+1] == '\t')) {
*type = MD_LINE_LIST;
i += 2;
while (raw_line[i] == ' ' || raw_line[i] == '\t') i++;
}
} else if (raw_line[i] == '>') {
*type = MD_LINE_BLOCKQUOTE;
i++;
if (raw_line[i] == ' ') i++;
}
while (raw_line[i] && out_idx < 255) {
if (raw_line[i] == '*' && raw_line[i+1] == '*') {
i += 2;
while (raw_line[i] && !(raw_line[i] == '*' && raw_line[i+1] == '*') && out_idx < 255) {
output[out_idx++] = raw_line[i++];
}
if (raw_line[i] == '*' && raw_line[i+1] == '*') i += 2;
continue;
}
if ((raw_line[i] == '*' || raw_line[i] == '_') && out_idx > 0 && raw_line[i-1] != '\\') {
char delim = raw_line[i];
i++;
while (raw_line[i] && raw_line[i] != delim && out_idx < 255) {
output[out_idx++] = raw_line[i++];
}
if (raw_line[i] == delim) i++;
continue;
}
if (raw_line[i] == '`') {
i++;
while (raw_line[i] && raw_line[i] != '`' && out_idx < 255) {
output[out_idx++] = raw_line[i++];
}
if (raw_line[i] == '`') i++;
continue;
}
if (raw_line[i] == '[') {
i++;
while (raw_line[i] && raw_line[i] != ']' && out_idx < 255) {
output[out_idx++] = raw_line[i++];
}
if (raw_line[i] == ']') i++;
if (raw_line[i] == '(') {
while (raw_line[i] && raw_line[i] != ')') i++;
if (raw_line[i] == ')') i++;
}
continue;
}
output[out_idx++] = raw_line[i++];
}
output[out_idx] = 0;
}
static void md_clear_all(void) {
for (int i = 0; i < MD_MAX_LINES; i++) {
lines[i].content[0] = 0;
lines[i].length = 0;
lines[i].type = MD_LINE_NORMAL;
lines[i].indent_level = 0;
}
line_count = 0;
scroll_top = 0;
open_filename[0] = 0;
}
void markdown_open_file(const char *filename) {
md_clear_all();
md_strcpy(open_filename, filename);
int fd = sys_open(filename, "r");
if (fd < 0) return;
static char buffer[MD_MAX_CONTENT];
int bytes_read = sys_read(fd, buffer, sizeof(buffer) - 1);
sys_close(fd);
if (bytes_read <= 0) return;
buffer[bytes_read] = 0;
int line = 0;
int col = 0;
char raw_line[256] = "";
bool in_code_block = false;
for (int i = 0; i < bytes_read && line < MD_MAX_LINES; i++) {
char ch = buffer[i];
if (ch == '\n') {
raw_line[col] = 0;
if (raw_line[0] == '`' && raw_line[1] == '`' && raw_line[2] == '`') {
in_code_block = !in_code_block;
} else {
if (in_code_block) {
md_strcpy(lines[line].content, raw_line);
lines[line].length = md_strlen(raw_line);
lines[line].type = MD_LINE_CODE;
lines[line].indent_level = 0;
line++;
} else {
char parsed_content[256];
MDLineType type;
int indent;
md_parse_line(raw_line, parsed_content, &type, &indent);
md_strcpy(lines[line].content, parsed_content);
lines[line].length = md_strlen(parsed_content);
lines[line].type = type;
lines[line].indent_level = indent;
line++;
}
}
col = 0;
raw_line[0] = 0;
} else if (col < 255) {
raw_line[col++] = ch;
}
}
if (col > 0 && line < MD_MAX_LINES) {
raw_line[col] = 0;
if (raw_line[0] == '`' && raw_line[1] == '`' && raw_line[2] == '`') {
} else if (in_code_block) {
md_strcpy(lines[line].content, raw_line);
lines[line].length = md_strlen(raw_line);
lines[line].type = MD_LINE_CODE;
lines[line].indent_level = 0;
line++;
} else {
char parsed_content[256];
MDLineType type;
int indent;
md_parse_line(raw_line, parsed_content, &type, &indent);
md_strcpy(lines[line].content, parsed_content);
lines[line].length = md_strlen(parsed_content);
lines[line].type = type;
lines[line].indent_level = indent;
line++;
}
}
line_count = line;
}
static void md_draw_text_bold(ui_window_t win, int x, int y, const char *text, uint32_t color) {
ui_draw_string(win, x, y, text, color);
ui_draw_string(win, x + 1, y, text, color);
}
static void md_paint(ui_window_t win) {
int offset_x = 4;
int offset_y = 0;
int content_width = win_w - 8;
int content_height = win_h - 28;
ui_draw_rounded_rect_filled(win, offset_x, offset_y, content_width, 20, 6, COLOR_DARK_PANEL);
ui_draw_string(win, offset_x + 4, offset_y + 4, "File", COLOR_DARK_TEXT);
ui_draw_string(win, offset_x + 50, offset_y + 4, open_filename, COLOR_DARK_TEXT);
int btn_x_up = offset_x + content_width - 50;
int btn_y = offset_y + 2;
ui_draw_rounded_rect_filled(win, btn_x_up, btn_y, 20, 16, 4, COLOR_DARK_TITLEBAR);
ui_draw_string(win, btn_x_up + 6, btn_y, "^", COLOR_DARK_TEXT);
ui_draw_rounded_rect_filled(win, btn_x_up + 24, btn_y, 20, 16, 4, COLOR_DARK_TITLEBAR);
ui_draw_string(win, btn_x_up + 30, btn_y, "v", COLOR_DARK_TEXT);
int content_start_y = offset_y + 24;
int content_start_x = offset_x + 4;
int usable_content_width = content_width - 8 - 20;
int usable_content_height = content_height - 28;
int max_display_lines = usable_content_height / MD_LINE_HEIGHT;
ui_draw_rounded_rect_filled(win, 4, content_start_y, win_w - 24, usable_content_height, 6, COLOR_DARK_BG);
int display_line = 0;
int i = scroll_top;
while (i < line_count && display_line < max_display_lines) {
MDLine *line = &lines[i];
int line_height = MD_LINE_HEIGHT;
int extra_spacing = 0;
uint32_t text_color = COLOR_DARK_TEXT;
bool use_bold = false;
switch (line->type) {
case MD_LINE_HEADING1:
line_height = MD_LINE_HEIGHT * 2;
text_color = 0xFF87CEEB;
use_bold = true;
extra_spacing = 4;
break;
case MD_LINE_HEADING2:
line_height = MD_LINE_HEIGHT + 6;
text_color = 0xFF4A90E2;
use_bold = true;
extra_spacing = 2;
break;
case MD_LINE_HEADING3:
line_height = MD_LINE_HEIGHT + 2;
text_color = 0xFF87CEEB;
use_bold = false;
break;
case MD_LINE_BLOCKQUOTE:
text_color = 0xFFA0A0A0;
break;
case MD_LINE_CODE:
text_color = 0xFF90EE90;
break;
default:
text_color = COLOR_DARK_TEXT;
break;
}
if (display_line + (line_height / MD_LINE_HEIGHT) > max_display_lines) break;
int x_offset = content_start_x + (line->indent_level * 4);
int available_width = usable_content_width - (line->indent_level * 4);
int max_chars_per_line = available_width / MD_CHAR_WIDTH;
if (max_chars_per_line < 1) max_chars_per_line = 1;
const char *text = line->content;
int text_len = line->length;
int char_idx = 0;
int local_display_line = 0;
int wrapped_line_count = 0;
while (char_idx < text_len || (text_len == 0 && local_display_line == 0)) {
int line_y = content_start_y + display_line * MD_LINE_HEIGHT + (local_display_line * MD_LINE_HEIGHT);
char line_segment[256];
int segment_len = 0;
int segment_start = char_idx;
while (char_idx < text_len && segment_len < max_chars_per_line) {
line_segment[segment_len++] = text[char_idx++];
}
line_segment[segment_len] = 0;
if (char_idx < text_len && segment_len > 0) {
int last_space = -1;
for (int j = segment_len - 1; j >= 0; j--) {
if (line_segment[j] == ' ') {
last_space = j; break;
}
}
if (last_space > 0) {
segment_len = last_space;
line_segment[segment_len] = 0;
char_idx = segment_start + last_space + 1;
while (char_idx < text_len && text[char_idx] == ' ') char_idx++;
}
}
if (line->type == MD_LINE_CODE && segment_len > 0) {
ui_draw_rect(win, x_offset - 2, line_y - 2, (segment_len * MD_CHAR_WIDTH) + 4, 12, COLOR_BLACK);
}
if (local_display_line == 0) {
switch (line->type) {
case MD_LINE_LIST:
ui_draw_rect(win, x_offset, line_y + MD_LINE_HEIGHT/2 - 1, 2, 2, COLOR_BLACK);
x_offset += 12;
if (segment_len > 0 && line_segment[0] == ' ') {
for (int j = 0; j < segment_len - 1; j++) line_segment[j] = line_segment[j + 1];
segment_len--;
}
break;
case MD_LINE_BLOCKQUOTE:
ui_draw_rect(win, x_offset - 4, line_y, 2, line_height, 0xFF404080);
break;
default: break;
}
}
if (segment_len > 0) {
if (use_bold) {
md_draw_text_bold(win, x_offset, line_y + extra_spacing, line_segment, text_color);
} else {
ui_draw_string(win, x_offset, line_y, line_segment, text_color);
}
}
local_display_line++;
wrapped_line_count++;
if (char_idx >= text_len) break;
}
display_line += (wrapped_line_count > 0 ? wrapped_line_count : 1);
i++;
}
}
static void md_handle_key(char c, bool pressed) {
if (!pressed) return;
if (c == 'w' || c == 'W' || c == 17) {
scroll_top -= 3;
if (scroll_top < 0) scroll_top = 0;
} else if (c == 's' || c == 'S' || c == 18) {
scroll_top += 3;
int max_scroll = line_count - 10;
if (scroll_top > max_scroll) scroll_top = max_scroll;
if (scroll_top < 0) scroll_top = 0;
}
}
static void md_handle_click(int x, int y) {
int content_width = win_w - 8;
int btn_x_up = 4 + content_width - 50;
int btn_y = 2;
if (x >= btn_x_up && x < btn_x_up + 20 && y >= btn_y && y < btn_y + 16) {
scroll_top -= 3;
if (scroll_top < 0) scroll_top = 0;
return;
}
int btn_x_down_top = 4 + content_width - 50 + 24;
if (x >= btn_x_down_top && x < btn_x_down_top + 20 && y >= btn_y && y < btn_y + 16) {
scroll_top += 3;
int max_scroll = line_count - 10;
if (scroll_top > max_scroll) scroll_top = max_scroll;
if (scroll_top < 0) scroll_top = 0;
return;
}
}
int main(int argc, char **argv) {
ui_window_t win = ui_window_create("Markdown Viewer", 150, 180, win_w, win_h);
if (!win) return 1;
md_clear_all();
if (argc > 1) {
markdown_open_file(argv[1]);
}
gui_event_t ev;
while (1) {
if (ui_get_event(win, &ev)) {
if (ev.type == GUI_EVENT_PAINT) {
md_paint(win);
ui_mark_dirty(win, 0, 0, win_w, win_h - 20);
} else if (ev.type == GUI_EVENT_CLICK) {
md_handle_click(ev.arg1, ev.arg2);
md_paint(win);
ui_mark_dirty(win, 0, 0, win_w, win_h - 20);
} else if (ev.type == GUI_EVENT_KEY) {
md_handle_key((char)ev.arg1, true);
md_paint(win);
ui_mark_dirty(win, 0, 0, win_w, win_h - 20);
} else if (ev.type == GUI_EVENT_KEYUP) {
md_handle_key((char)ev.arg1, false);
} else if (ev.type == GUI_EVENT_CLOSE) {
sys_exit(0);
}
} else {
sleep(10);
}
}
return 0;
}
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