feat: API coverage tool

tools/api-coverage.ts

@@ -0,0 +1,54 @@
+import { dirname, join } from 'jsr:@std/path@1.0.3';
+import { walk } from 'jsr:@std/fs@1.0.2';
+
+const PROJECT_ROOT = dirname(import.meta.dirname!);
+const DECODER = new TextDecoder('utf-8');
+const SYMBOL_DEF_REGEX = /pub\s+([A-Za-z_][A-Za-z0-9_]+):/;
+const SYMBOL_USAGE_REGEX = /ortsys!\[\s*(?:unsafe\s+)?([A-Za-z_][A-Za-z0-9_]+)/gm;
+
+const IGNORED_SYMBOLS = new Set<string>([
+	'CreateEnv', // we will always create an env with a custom logger for integration w/ tracing
+]);
+
+const sysSymbols = new Set<string>();
+const sysFile = await Deno.readFile(join(PROJECT_ROOT, 'ort-sys', 'src', 'lib.rs'));
+let isInOrtApi = false;
+for (const line of DECODER.decode(sysFile).split('\n')) {
+	if (line === 'pub struct OrtApi {') {
+		isInOrtApi = true;
+		continue;
+	}
+
+	if (isInOrtApi) {
+		if (line === '}') {
+			isInOrtApi = false;
+			continue;
+		}
+
+		const trimmedLine = line.trimStart();
+		if (SYMBOL_DEF_REGEX.test(trimmedLine)) {
+			const [ _, symbol ] = trimmedLine.match(SYMBOL_DEF_REGEX)!;
+			sysSymbols.add(symbol);
+		}
+	}
+}
+
+const usedSymbols = new Set<string>();
+for await (const sourceFile of walk(join(PROJECT_ROOT, 'src'))) {
+	if (sourceFile.isDirectory) {
+		continue;
+	}
+
+	const contents = DECODER.decode(await Deno.readFile(sourceFile.path));
+	for (const [ _, symbol ] of contents.matchAll(SYMBOL_USAGE_REGEX)) {
+		usedSymbols.add(symbol);
+	}
+}
+
+const unusedSymbols = sysSymbols
+	.difference(usedSymbols)
+	.difference(IGNORED_SYMBOLS);
+for (const symbol of unusedSymbols) {
+	console.log(`%c\t${symbol}`, 'color: red');
+}
+console.log(`%cCoverage: ${usedSymbols.size}/${sysSymbols.size} (${((usedSymbols.size / sysSymbols.size) * 100).toFixed(2)}%)`, 'color: green; font-weight: bold');