1 files changed, 147 insertions, 0 deletions
diff --git a/material-symbols-plugin.js b/material-symbols-plugin.js
new file mode 100644
index 0000000..b161883
--- /dev/null
+++ b/material-symbols-plugin.js
@@ -0,0 +1,147 @@
+const fs = require("fs")
+const path = require("path")
+const crypto = require("crypto")
+const axios = require("axios")
+const { Compilation } = require("webpack")
+const { generateAtlasViewsFromReferences } = require("./utils.js")
+
+
+class MaterialSymbolsDownloader {
+	static validStyls = [ "outlined", "rounded", "sharp" ]
+	static validWghts = [ 100, 200, 300, 400, 500, 600, 700 ]
+	static validGrads = [ -25, 0, 200 ]
+	static validFills = [ false, true ]
+	static validOpszs = [ 20, 24, 40, 48 ]
+
+	constructor(ref) {
+		this.icon = ref.symbol
+		this.styl = ref.style ?? "outlined"
+		this.wght = ref.wght  ?? 400
+		this.grad = ref.grad  ?? 0
+		this.fill = ref.fill  ?? false
+		this.opsz = ref.opsz  ?? 24
+		this.validateProperties()
+	}
+
+	validateProperties() {
+		// TODO validate icons
+		if (!MaterialSymbolsDownloader.validStyls.includes(this.styl)) throw new Error(`Styl ${this.styl} is not valid, must be one of ${this.validStyls}`)
+		if (!MaterialSymbolsDownloader.validWghts.includes(this.wght)) throw new Error(`Wght ${this.wght} is not valid, must be one of ${this.validWghts}`)
+		if (!MaterialSymbolsDownloader.validGrads.includes(this.grad)) throw new Error(`Grad ${this.grad} is not valid, must be one of ${this.validGrads}`)
+		if (!MaterialSymbolsDownloader.validFills.includes(this.fill)) throw new Error(`Fill ${this.fill} is not valid, must be one of ${this.validFills}`)
+		if (!MaterialSymbolsDownloader.validOpszs.includes(this.opsz)) throw new Error(`Opsz ${this.opsz} is not valid, must be one of ${this.validOpszs}`)
+	}
+
+	get axes() {
+		const wght = this.wght == 400 ? "" : `wght${this.wght}`
+		const grad = this.grad == 0   ? "" : `grad${this.grad}`
+		const fill = !this.fill       ? "" : "fill1"
+		return wght + grad + fill || "default"
+	}
+
+	get svgDownloadUrl() {
+		return `https://fonts.gstatic.com/s/i/short-term/release/materialsymbols${this.styl}/${this.icon}/${this.axes}/${this.opsz}px.svg`
+	}
+
+	async downloadSvg(cache) {
+		const url = this.svgDownloadUrl
+		const cached = await cache.getPromise(url, null)
+		if (cached)
+			return cached
+
+		try {
+			const res = await axios.get(url)
+			const svg = res.data
+			await cache.storePromise(url, null, svg)
+			return svg
+		} catch (err) {
+			throw new Error(`Symbol ${this.icon} could not be downloaded. Error: ${err}`)
+		}
+	}
+}
+
+
+class MaterialSymbolsAtlasPlugin {
+	constructor({ referenceFile, filename }) {
+		this.referenceFile = path.resolve(referenceFile)
+		this.filename = filename ?? "icons.svg"
+	}
+
+	readReferences() {
+		const ext = path.extname(this.referenceFile)
+
+		if (ext !== ".json")
+			throw new Error(`Unsupported reference file extension: ${ext}. Only .json files are supported at this time`)
+
+		const content = fs.readFileSync(this.referenceFile, "utf8")
+		return JSON.parse(content)
+	}
+
+	async resolveRefs(refs, cache) {
+		const root = path.dirname(this.referenceFile) // Relative to referenceFile
+
+		for (const ref of refs) {
+			if (ref.path) {
+				// Local files
+				const filePath = path.join(root, ref.path)
+				if (!fs.existsSync(filePath))
+					throw new Error(`SVG asset at ${filePath} does not exist`)
+				ref.svg = fs.readFileSync(filePath, "utf8" )
+			} else if (ref.symbol) {
+				// Material symbol icon refs
+				const symbolDl = new MaterialSymbolsDownloader(ref)
+				ref.svg = await symbolDl.downloadSvg(cache)
+			} else {
+				throw new Error(`Ref does not provide a symbol name or path:\n${ref}`)
+			}
+		}
+		return refs
+	}
+
+	apply(compiler) {
+		compiler.hooks.thisCompilation.tap("MaterialSymbolsAtlasPlugin", (compilation) => {
+			compilation.hooks.processAssets.tapPromise(
+				{
+					name: "MaterialSymbolsAtlasPlugin",
+					stage: Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
+				},
+				async () => {
+					try {
+						// Handle cache
+						const cache = compilation.getCache("MaterialSymbolsAtlasPlugin")
+
+						const content = this.readReferences()
+						const cacheKey = crypto.createHash("sha256")
+							.update(JSON.stringify(content))
+							.digest("hex")
+
+						const cached = await cache.getPromise(cacheKey, null)
+
+						// Create asset if not existing
+						let atlas = cached
+						if (!cached) {
+							const refs = content.refs
+							const svgRefs = await this.resolveRefs(refs, cache)
+							atlas = await generateAtlasViewsFromReferences(svgRefs)
+							await cache.storePromise(cacheKey, null, atlas)
+						}
+
+						compilation.emitAsset(
+							this.filename,
+							new compiler.webpack.sources.RawSource(atlas)
+						)
+					} catch (err) {
+						compilation.errors.push(err)
+					}
+				}
+			)
+		})
+
+		compiler.hooks.afterCompile.tap("MaterialSymbolsAtlasPlugin", (compilation) => {
+			// Watch the reference file for changes
+			compilation.fileDependencies.add(this.referenceFile)
+		})
+	}
+}
+
+module.exports = MaterialSymbolsAtlasPlugin