fix: use seti ui repo to generate file icons (#2648)

3 files changed, 71 insertions, 32 deletions

diff --git a/packages/file-icons-generator/index.ts b/packages/file-icons-generator/index.ts
index 195d3165..11642cee 100644
--- a/packages/file-icons-generator/index.ts
+++ b/packages/file-icons-generator/index.ts
@@ -1,24 +1,28 @@
 import { writeDefinitionsAndSVGs } from './utils/file';
 import { getIconSvgPaths } from './utils/font';
-import { fetchFont, fetchMapping, parseMapping } from './utils/seti';
+import { deleteRepo, parseMapping, setupRepo } from './utils/seti';
 
 /**
  * Script generating definitions used by the Starlight `<FileTree>` component and associated SVGs.
  *
- * To do so, it fetches the Seti UI icon mapping file and font from GitHub, parses the mapping to
- * generate the definitions and a list of icons to extract as SVGs, and finally extracts the SVGs
- * from the font and writes the definitions and SVGs to the Starlight package in a file ready to be
- * consumed by Starlight.
+ * To do so, it clones the Seti UI repository, installs dependencies, generates icons, parses the
+ * mapping to generate the definitions and a list of icons to extract as SVGs, and finally extracts
+ * the SVGs from the font and writes the definitions and SVGs to the Starlight package in a file
+ * ready to be consumed by Starlight.
  *
  * @see {@link file://./config.ts} for the configuration used by this script.
  * @see {@link file://../starlight/user-components/file-tree-icons.ts} for the generated file.
  * @see {@link https://opentype.js.org/glyph-inspector.html} for a font glyph inspector.
  */
 
-const mapping = await fetchMapping();
-const { definitions, icons } = parseMapping(mapping);
+const repoPath = await setupRepo();
 
-const font = await fetchFont();
-const svgPaths = getIconSvgPaths(icons, definitions, font);
+try {
+	const { definitions, icons } = await parseMapping(repoPath);
 
-await writeDefinitionsAndSVGs(definitions, svgPaths);
+	const svgPaths = await getIconSvgPaths(repoPath, icons, definitions);
+
+	await writeDefinitionsAndSVGs(definitions, svgPaths);
+} finally {
+	await deleteRepo(repoPath);
+}
diff --git a/packages/file-icons-generator/utils/font.ts b/packages/file-icons-generator/utils/font.ts
index a9518e1b..64ce32cf 100644
--- a/packages/file-icons-generator/utils/font.ts
+++ b/packages/file-icons-generator/utils/font.ts
@@ -1,17 +1,15 @@
 import opentype, { type Font, Glyph } from 'opentype.js';
 import { seti, starlight } from '../config';
 import type { Definitions } from '../../starlight/user-components/rehype-file-tree';
-import { getSetiIconName } from './seti';
+import { getFont, getSetiIconName } from './seti';
 
 // This matches the default precision used by the SVGO default preset.
 const pathDecimalPrecision = 3;
 
 /** Extract SVG paths from the Seti UI icon font from a list of icon names matching font glyphs. */
-export function getIconSvgPaths(
-	icons: string[],
-	definitions: Definitions,
-	fontBuffer: ArrayBuffer
-) {
+export async function getIconSvgPaths(repoPath: string, icons: string[], definitions: Definitions) {
+	const fontBuffer = await getFont(repoPath);
+
 	const iconSvgs: Record<string, string> = {};
 
 	let font: Font;
diff --git a/packages/file-icons-generator/utils/seti.ts b/packages/file-icons-generator/utils/seti.ts
index 283353e5..fa4d4642 100644
--- a/packages/file-icons-generator/utils/seti.ts
+++ b/packages/file-icons-generator/utils/seti.ts
@@ -1,3 +1,7 @@
+import { spawnSync, type SpawnSyncOptions } from 'node:child_process';
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
 import { seti, starlight } from '../config';
 import type { Definitions } from '../../starlight/user-components/rehype-file-tree.ts';
 
@@ -7,33 +11,56 @@ import type { Definitions } from '../../starlight/user-components/rehype-file-tr
 const mappingRegex =
 	/^\.icon-(?<type>(set|partial))\((?<quote>['"])(?<identifier>.+)\k<quote>, \k<quote>(?<lang>.+)\k<quote>, @.+\);$/;
 
-/** Fetch the Seti UI icon mapping file from GitHub. */
-export async function fetchMapping() {
+/** Clone the Seti UI repository, install dependencies, and generate the Seti UI icons. */
+export async function setupRepo() {
 	try {
-		const result = await fetch(getGitHubDownloadLink(seti.repo, seti.mapping));
-		return await result.text();
+		const repoPath = await fs.mkdtemp(path.join(os.tmpdir(), 'starlight-file-icons-'));
+
+		const spawnOptions: SpawnSyncOptions = {
+			cwd: repoPath,
+			encoding: 'utf8',
+		};
+
+		let result = spawnSync('git', ['clone', `https://github.com/${seti.repo}`, '.'], spawnOptions);
+		if (result.error) throw new Error('Failed to clone the Seti UI repository.');
+
+		result = spawnSync('npm', ['install'], spawnOptions);
+		if (result.error) throw new Error('Failed to install the Seti UI dependencies.');
+
+		result = spawnSync('npm', ['run', 'createIcons'], spawnOptions);
+		if (result.error) throw new Error('Failed to generate the Seti UI icons.');
+
+		return repoPath;
 	} catch (error) {
 		throw new Error(
-			'Failed to download Seti UI icon mapping file. Make sure the repository URL and mapping path are correct.',
+			'Failed to setup the Seti UI repo. Make sure the repository URL and font path are correct.',
 			{ cause: error }
 		);
 	}
 }
 
+/** Delete the Seti UI repository. */
+export async function deleteRepo(repoPath: string) {
+	try {
+		await fs.rm(repoPath, { force: true, recursive: true });
+	} catch (error) {
+		throw new Error('Failed to remove the Seti UI repo.', { cause: error });
+	}
+}
+
 /**
- * Fetch the Seti UI icon font from GitHub.
+ * Get the Seti UI icon font from a local repository.
  * Note that the `woff` font format is used and not `woff2` as we would manually need to decompress
  * it and we do not need the compression benefits for this use case.
  */
-export async function fetchFont() {
+export async function getFont(repoPath: string) {
 	try {
-		const result = await fetch(getGitHubDownloadLink(seti.repo, seti.font));
-		return await result.arrayBuffer();
+		const result = await fs.readFile(path.join(repoPath, seti.font));
+		return new Uint8Array(result).buffer;
 	} catch (error) {
-		throw new Error(
-			'Failed to download Seti UI font. Make sure the repository URL and font path are correct.',
-			{ cause: error }
-		);
+		throw new Error('Failed to read Seti UI font. Make sure the font path is correct.', {
+			cause: error,
+		});
 	}
 }
 
@@ -42,7 +69,9 @@ export async function fetchFont() {
  * component and a list of Seti UI icons to extract as SVGs.
  * @see https://github.com/elviswolcott/seti-icons/blob/master/build/extract.ts
  */
-export function parseMapping(mapping: string) {
+export async function parseMapping(repoPath: string) {
+	const mapping = await getMapping(repoPath);
+
 	const lines = mapping.split('\n');
 	// Include the `folder` icon by default as it is not defined in the mapping file.
 	const icons = new Set<string>(['folder']);
@@ -87,6 +116,14 @@ export function getSetiIconName(icon: string) {
 	return `${starlight.prefix}${name}`;
 }
 
-function getGitHubDownloadLink(repo: string, path: string) {
-	return `https://raw.githubusercontent.com/${repo}/${seti.branch}/${path}`;
+/** Get the Seti UI icon mapping file from a local repository. */
+async function getMapping(repoPath: string) {
+	try {
+		return await fs.readFile(path.join(repoPath, seti.mapping), 'utf8');
+	} catch (error) {
+		throw new Error(
+			'Failed to read Seti UI icon mapping file. Make sure the mapping file path is correct.',
+			{ cause: error }
+		);
+	}
 }