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comparison mrjunejune/create_html_from_md.c @ 169:295ac2e5ec00

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[MrJuneJune] Created separate target for generating html from md.
author MrJuneJune <me@mrjunejune.com>
date Mon, 19 Jan 2026 17:33:18 -0800
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168:f3084bca7317 169:295ac2e5ec00
1 #include "markdown_converter/markdown_to_html.h"
2 #include "dowa/dowa.h"
3 #include <fcntl.h>
4
5 #define BLOG_PATH "/home/june/zenbu/mrjunejune/src/blog/"
6 #define BLOG_HTML "<!DOCTYPE html>" \
7 "<html lang=\"en\">" \
8 "<head>" \
9 " <meta charset=\"UTF-8\">" \
10 " <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">" \
11 " <meta name=\"description\" content=\"%s\">" \
12 " <title>%s - June's Blog</title>" \
13 " {{/parts/base_head.html}}" \
14 " <link rel=\"stylesheet\" href=\"/public/highlight/a11y-dark.min.css\" media=\"(prefers-color-scheme: dark)\">" \
15 " <link rel=\"stylesheet\" href=\"/public/highlight/a11y-light.min.css\" media=\"(prefers-color-scheme: light)\">" \
16 " <script src=\"/public/highlight/highlight.min.js\"></script>" \
17 "</head>" \
18 "<body>" \
19 " {{/parts/header.html}}" \
20 " <main>" \
21 "%s" \
22 " </main>" \
23 " {{/parts/footer.html}}" \
24 " <script>hljs.highlightAll();</script>"\
25 "</body>"
26
27
28 typedef struct {
29 char title[256];
30 char description[512];
31 char *content; // markdown content after frontmatter
32 } Blog_Metadata;
33
34 // Parse frontmatter from markdown content
35 // Expected format:
36 // ---
37 // title: My Title
38 // description: My description
39 // ---
40 // markdown
41 static Blog_Metadata Parse_Blog_Frontmatter(const char *md_content)
42 {
43 Blog_Metadata meta = {0};
44 strcpy(meta.title, "Untitled");
45 strcpy(meta.description, "A blog post by June");
46 meta.content = (char *)md_content;
47
48 if (!md_content) return meta;
49
50 if (strncmp(md_content, "---", 3) != 0)
51 return meta;
52
53 const char *end_delim = strstr(md_content + 3, "\n---");
54 if (!end_delim)
55 return meta;
56
57 const char *cursor = md_content + 4; // skip "---\n"
58 while (cursor < end_delim)
59 {
60 // whitespaces
61 while (cursor < end_delim && (*cursor == ' ' || *cursor == '\t')) cursor++;
62
63 const char *line_end = cursor;
64 while (line_end < end_delim && *line_end != '\n') line_end++;
65
66 const char *colon = cursor;
67 while (colon < line_end && *colon != ':') colon++;
68
69 if (colon < line_end) {
70 size_t key_len = colon - cursor;
71 const char *value_start = colon + 1;
72 while (value_start < line_end && (*value_start == ' ' || *value_start == '\t')) value_start++;
73 size_t value_len = line_end - value_start;
74
75 if (key_len == 5 && strncmp(cursor, "title", 5) == 0)
76 {
77 size_t copy_len = value_len < sizeof(meta.title) - 1 ? value_len : sizeof(meta.title) - 1;
78 strncpy(meta.title, value_start, copy_len);
79 meta.title[copy_len] = '\0';
80 }
81 else if (key_len == 11 && strncmp(cursor, "description", 11) == 0)
82 {
83 size_t copy_len = value_len < sizeof(meta.description) - 1 ? value_len : sizeof(meta.description) - 1;
84 strncpy(meta.description, value_start, copy_len);
85 meta.description[copy_len] = '\0';
86 }
87 }
88
89 cursor = line_end + 1;
90 }
91
92 meta.content = (char *)(end_delim + 4);
93 if (*meta.content == '\n') meta.content++;
94
95 return meta;
96 }
97
98 int main()
99 {
100 Dowa_Arena *arena = Dowa_Arena_Create(1024 * 1024 * 5);
101 size_t buffer_sizes = 100 * 1024;
102
103 char *files[] = {
104 BLOG_PATH"thoughts-on-ide/index.md",
105 BLOG_PATH"multithread-in-js/index.md",
106 BLOG_PATH"thoughts-on-tdd/index.md",
107 BLOG_PATH"my-seobeo-journey/index.md",
108 BLOG_PATH"wasm-bunny/index.md",
109 BLOG_PATH"optimizing-data-structures/index.md",
110 BLOG_PATH"websocket-demystified/index.md",
111 BLOG_PATH"optimizing-grass-rendering/index.md",
112 BLOG_PATH"wsl2-ssh/index.md"
113 };
114
115 for (int i = 0; i < 9; i++)
116 {
117 char *md_file_path = files[i];
118 char *md_file = Dowa_Arena_Allocate(arena, buffer_sizes);
119
120 FILE *file = fopen(md_file_path, "ro");
121 fseek(file, 0, SEEK_END);
122 size_t file_length = ftell(file);
123 fseek(file, 0, SEEK_SET);
124 fread(md_file, 1, file_length, file);
125
126 Blog_Metadata meta = Parse_Blog_Frontmatter(md_file);
127 char *md = markdown_to_html(meta.content);
128 char *ssr_body = Dowa_Arena_Allocate(arena, buffer_sizes);
129 char *final_body = Dowa_Arena_Allocate(arena, buffer_sizes);
130 snprintf(ssr_body, buffer_sizes, BLOG_HTML, meta.description, meta.title, md);
131
132 int open_flags = O_RDWR | O_CREAT | O_EXCL;
133 size_t md_file_path_length = strlen(md_file_path);
134 md_file_path_length -= 3; // html
135 char *new_file_path = Dowa_Arena_Allocate(arena, 1024);
136 snprintf(new_file_path, 1024, "%.*s.html", (int)md_file_path_length, md_file_path);
137
138 FILE *new_file_fd = fopen(new_file_path, "w+");
139 if (!new_file_fd)
140 return;
141 printf("Saving to %s...\n", new_file_path);
142 fwrite(ssr_body, 1, buffer_sizes, new_file_fd);
143 fclose(new_file_fd);
144 }
145 return 0;
146 }
147