import { describe, it, expect, beforeEach, afterEach } from "@jest/globals";
import { promises as fs } from "fs";
import os from "os";
import path from "path";
import { generateSlideIds } from "../generate_slide_ids.js";
const SLIDE_SEPARATOR = /\n---\n+/;
describe("generateSlideIds", () => {
let tempDir: string;
beforeEach(async () => {
tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "marp-init-"));
});
afterEach(async () => {
await fs.rm(tempDir, { recursive: true, force: true });
});
it("adds slide IDs without altering frontmatter", async () => {
const filePath = path.join(tempDir, "slides.md");
const originalFrontmatter = [
"---",
"custom: keep-me",
"paginate: false",
"---",
"",
].join("\n");
await fs.writeFile(
filePath,
[
originalFrontmatter,
"# Slide 1",
"",
"---",
"",
"# Slide 2",
].join("\n"),
"utf-8",
);
await generateSlideIds({ filePath });
const content = await fs.readFile(filePath, "utf-8");
expect(content.startsWith(originalFrontmatter)).toBe(true);
const body = content.slice(originalFrontmatter.length).trim();
const slides = body.split(SLIDE_SEPARATOR);
expect(slides).toHaveLength(2);
for (const slide of slides) {
expect(slide).toMatch(/<!--\s*slide-id:/i);
}
});
it("does not inject frontmatter when missing", async () => {
const filePath = path.join(tempDir, "plain.md");
await fs.writeFile(
filePath,
["# Slide 1", "", "---", "", "# Slide 2"].join("\n"),
"utf-8",
);
await generateSlideIds({ filePath });
const content = await fs.readFile(filePath, "utf-8");
expect(content.startsWith("---\nmarp: true")).toBe(false);
const slides = content.trim().split(SLIDE_SEPARATOR);
expect(slides).toHaveLength(2);
for (const slide of slides) {
expect(slide).toMatch(/<!--\s*slide-id:/i);
}
});
it("does not modify files already initialized", async () => {
const filePath = path.join(tempDir, "prepped.md");
const prepared = [
"---",
"marp: true",
"theme: default",
"---",
"",
"<!-- slide-id: abc -->",
"",
"# Slide",
].join("\n");
await fs.writeFile(filePath, prepared, "utf-8");
await generateSlideIds({ filePath });
const afterFirst = await fs.readFile(filePath, "utf-8");
await generateSlideIds({ filePath });
const afterSecond = await fs.readFile(filePath, "utf-8");
expect(afterFirst).toBe(prepared);
expect(afterSecond).toBe(prepared);
});
});
