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annotate mrjunejune/create_html_from_md.c @ 202:b9b184b3303c

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[Notes] Images get processed and it is properly fetched. Thank you.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 09:12:57 -0800
parents 295ac2e5ec00
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
169
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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1 #include "markdown_converter/markdown_to_html.h"
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2 #include "dowa/dowa.h"
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3 #include <fcntl.h>
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4
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5 #define BLOG_PATH "/home/june/zenbu/mrjunejune/src/blog/"
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6 #define BLOG_HTML "<!DOCTYPE html>" \
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7 "<html lang=\"en\">" \
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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8 "<head>" \
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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9 " <meta charset=\"UTF-8\">" \
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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10 " <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">" \
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11 " <meta name=\"description\" content=\"%s\">" \
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12 " <title>%s - June's Blog</title>" \
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13 " {{/parts/base_head.html}}" \
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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14 " <link rel=\"stylesheet\" href=\"/public/highlight/a11y-dark.min.css\" media=\"(prefers-color-scheme: dark)\">" \
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15 " <link rel=\"stylesheet\" href=\"/public/highlight/a11y-light.min.css\" media=\"(prefers-color-scheme: light)\">" \
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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16 " <script src=\"/public/highlight/highlight.min.js\"></script>" \
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17 "</head>" \
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18 "<body>" \
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19 " {{/parts/header.html}}" \
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20 " <main>" \
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
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21 "%s" \
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22 " </main>" \
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23 " {{/parts/footer.html}}" \
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24 " <script>hljs.highlightAll();</script>"\
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25 "</body>"
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26
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27
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28 typedef struct {
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29 char title[256];
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30 char description[512];
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31 char *content; // markdown content after frontmatter
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32 } Blog_Metadata;
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33
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34 // Parse frontmatter from markdown content
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35 // Expected format:
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36 // ---
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37 // title: My Title
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38 // description: My description
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39 // ---
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40 // markdown
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41 static Blog_Metadata Parse_Blog_Frontmatter(const char *md_content)
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42 {
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43 Blog_Metadata meta = {0};
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44 strcpy(meta.title, "Untitled");
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45 strcpy(meta.description, "A blog post by June");
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46 meta.content = (char *)md_content;
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47
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48 if (!md_content) return meta;
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49
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50 if (strncmp(md_content, "---", 3) != 0)
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51 return meta;
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52
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53 const char *end_delim = strstr(md_content + 3, "\n---");
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54 if (!end_delim)
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55 return meta;
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56
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57 const char *cursor = md_content + 4; // skip "---\n"
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58 while (cursor < end_delim)
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59 {
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60 // whitespaces
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61 while (cursor < end_delim && (*cursor == ' ' || *cursor == '\t')) cursor++;
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62
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63 const char *line_end = cursor;
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64 while (line_end < end_delim && *line_end != '\n') line_end++;
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65
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66 const char *colon = cursor;
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67 while (colon < line_end && *colon != ':') colon++;
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68
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69 if (colon < line_end) {
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70 size_t key_len = colon - cursor;
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71 const char *value_start = colon + 1;
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72 while (value_start < line_end && (*value_start == ' ' || *value_start == '\t')) value_start++;
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73 size_t value_len = line_end - value_start;
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74
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75 if (key_len == 5 && strncmp(cursor, "title", 5) == 0)
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76 {
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77 size_t copy_len = value_len < sizeof(meta.title) - 1 ? value_len : sizeof(meta.title) - 1;
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78 strncpy(meta.title, value_start, copy_len);
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79 meta.title[copy_len] = '\0';
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80 }
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81 else if (key_len == 11 && strncmp(cursor, "description", 11) == 0)
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82 {
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83 size_t copy_len = value_len < sizeof(meta.description) - 1 ? value_len : sizeof(meta.description) - 1;
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84 strncpy(meta.description, value_start, copy_len);
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85 meta.description[copy_len] = '\0';
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86 }
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87 }
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88
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89 cursor = line_end + 1;
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90 }
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91
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92 meta.content = (char *)(end_delim + 4);
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93 if (*meta.content == '\n') meta.content++;
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94
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95 return meta;
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96 }
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97
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98 int main()
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99 {
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100 Dowa_Arena *arena = Dowa_Arena_Create(1024 * 1024 * 5);
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101 size_t buffer_sizes = 100 * 1024;
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102
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103 char *files[] = {
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104 BLOG_PATH"thoughts-on-ide/index.md",
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105 BLOG_PATH"multithread-in-js/index.md",
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106 BLOG_PATH"thoughts-on-tdd/index.md",
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107 BLOG_PATH"my-seobeo-journey/index.md",
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108 BLOG_PATH"wasm-bunny/index.md",
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109 BLOG_PATH"optimizing-data-structures/index.md",
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110 BLOG_PATH"websocket-demystified/index.md",
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111 BLOG_PATH"optimizing-grass-rendering/index.md",
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112 BLOG_PATH"wsl2-ssh/index.md"
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113 };
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114
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115 for (int i = 0; i < 9; i++)
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116 {
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117 char *md_file_path = files[i];
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118 char *md_file = Dowa_Arena_Allocate(arena, buffer_sizes);
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119
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120 FILE *file = fopen(md_file_path, "ro");
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121 fseek(file, 0, SEEK_END);
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122 size_t file_length = ftell(file);
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123 fseek(file, 0, SEEK_SET);
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124 fread(md_file, 1, file_length, file);
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125
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126 Blog_Metadata meta = Parse_Blog_Frontmatter(md_file);
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127 char *md = markdown_to_html(meta.content);
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128 char *ssr_body = Dowa_Arena_Allocate(arena, buffer_sizes);
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129 char *final_body = Dowa_Arena_Allocate(arena, buffer_sizes);
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130 snprintf(ssr_body, buffer_sizes, BLOG_HTML, meta.description, meta.title, md);
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131
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diff changeset
132 int open_flags = O_RDWR | O_CREAT | O_EXCL;
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
133 size_t md_file_path_length = strlen(md_file_path);
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
134 md_file_path_length -= 3; // html
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
135 char *new_file_path = Dowa_Arena_Allocate(arena, 1024);
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
136 snprintf(new_file_path, 1024, "%.*s.html", (int)md_file_path_length, md_file_path);
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
137
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
138 FILE *new_file_fd = fopen(new_file_path, "w+");
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
139 if (!new_file_fd)
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
140 return;
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
141 printf("Saving to %s...\n", new_file_path);
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
142 fwrite(ssr_body, 1, buffer_sizes, new_file_fd);
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
143 fclose(new_file_fd);
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
144 }
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
145 return 0;
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
146 }
295ac2e5ec00 [MrJuneJune] Created separate target for generating html from md.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
147