build system (saki) done

saki.ts

@@ -1,7 +1,73 @@
-import { readFileSync, writeFileSync } from 'fs';
-import { Renderer } from './ryuji';
+import * as path from 'path';
+import { copyFileSync, existsSync, readdirSync, rmSync, mkdirSync, readFileSync, writeFileSync } from 'fs';
+import type { Renderer } from './ryuji.js';
 import { parse_md_to_html } from 'makoto';
 
+export class Builder {
+  build_dir: string;
+
+  constructor(build_dir: string="/build") {
+    this.build_dir = path.join(__dirname, build_dir);
+    if (existsSync(this.build_dir)) {
+      //wipe the build directory
+      rmSync(this.build_dir, {
+        recursive: true,
+      });
+    }
+    mkdirSync(this.build_dir);
+  }
+
+  static copy_folder(folder_path: string, dest_path: string) {
+    let children: string[] = readdirSync(folder_path);
+    for (let i=0; i < children.length; i++) {
+      let child: string = children[i];
+      let child_path: string = path.join(folder_path, child);
+      let copy_path: string = path.join(dest_path, child);
+      if (child.includes(".")) {
+        //file
+        copyFileSync(child_path, copy_path);
+      } else {
+        //directory, make directory and recursively copy
+        mkdirSync(copy_path);
+        Builder.copy_folder(child_path, path.join(dest_path, child));
+      }
+    }
+  }
+
+  serve_static_folder(static_dir: string, serve_from: string="/") {
+    let static_path: string = path.join(__dirname, static_dir);
+    let dest_path: string = path.join(this.build_dir, serve_from);
+    Builder.copy_folder(static_path, dest_path);
+  }
+
+  serve_content(content: string, serve_path: string) {
+    let dest_path: string = path.join(this.build_dir, serve_path);
+    if (!serve_path.includes(".")) {
+      //serve as index.html in serve_path directory
+      if (dest_path !== this.build_dir && dest_path !== path.join(this.build_dir, "/")) {
+        //will not make a new directory if `serve_path` is "/", since the build directory already exists
+        mkdirSync(dest_path);
+      }
+      writeFileSync(path.join(dest_path, "index.html"), content);
+    } else {
+      //serve as file regularly
+      writeFileSync(dest_path, content);
+    }
+  }
+
+  serve_file(file_path: string, serve_path: string) {
+    let file_content: string = readFileSync(path.join(__dirname, file_path), "utf-8");
+    this.serve_content(file_content, serve_path);
+  }
+
+  _serve_template(renderer: Renderer, serve_path: string, template_name: string, vars: any) {
+    let content: string = renderer.render_template(template_name, vars);
+    this.serve_content(content, serve_path);
+  }
+}
+
+//this code is more or less specific to my blog
+
 export interface PostMetadata {
   title: string,
   slug: string,
@@ -16,4 +82,46 @@ export interface Post extends PostMetadata {
   html: string,
 }
 
-//
+export class BlogBuilder extends Builder {
+  renderer: Renderer;
+
+  constructor(renderer: Renderer, build_dir: string="/build") {
+    super(build_dir);
+    this.renderer = renderer;
+  }
+
+  serve_template(serve_path: string, template_name: string, vars: any) {
+    super._serve_template(this.renderer, serve_path, template_name, vars);
+  }
+
+  serve_markdown(serve_path: string, template_name: string, markdown_post: Post, additional_vars: any={}) {
+    additional_vars.post = markdown_post;
+    this.serve_template(serve_path, template_name, {
+      post: markdown_post,
+      author_expected: markdown_post.author.toLowerCase().startsWith("jetstream0") || markdown_post.author.toLowerCase().startsWith("prussia"),
+    });
+  }
+
+  serve_markdowns(serve_path: string, posts_path: string, template_name: string, posts_metadata: PostMetadata[], own_dir: boolean=true) {
+    let posts_dir_path: string = path.join(this.build_dir, posts_path);
+    if (!existsSync(posts_dir_path)) {
+      mkdirSync(posts_dir_path);
+    }
+    for (let i=0; i < posts_metadata.length; i++) {
+      let post_metadata: PostMetadata = posts_metadata[i];
+      let post_md_path: string = path.join(__dirname, posts_path, `${post_metadata.slug}.md`);
+      let post_md: string = readFileSync(post_md_path, "utf-8");
+      let post_html: string = parse_md_to_html(post_md);
+      let post: Post = {
+        ...post_metadata,
+        md: post_md,
+        html: post_html,
+      };
+      if (own_dir) {
+        this.serve_markdown(path.join(serve_path, post.slug), template_name, post);
+      } else {
+        this.serve_markdown(path.join(serve_path, `${post.slug}.html`), template_name, post);
+      }
+    }
+  }
+}