yayjarred/prepare-for-libuv

1 files changed, 64 insertions, 0 deletions

diff --git a/src/codegen/helpers.ts b/src/codegen/helpers.ts
new file mode 100644
index 000000000..d259a526e
--- /dev/null
+++ b/src/codegen/helpers.ts
@@ -0,0 +1,64 @@
+import fs from "fs";
+import path from "path";
+import { isAscii } from "buffer";
+
+export function fmtCPPString(str: string) {
+  return (
+    '"' +
+    str
+      .replace(/\\/g, "\\\\")
+      .replace(/"/g, '\\"')
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/\t/g, "\\t")
+      .replace(/\?/g, "\\?") + // https://stackoverflow.com/questions/1234582
+    '"'
+  );
+}
+
+export function cap(str: string) {
+  return str[0].toUpperCase() + str.slice(1);
+}
+
+export function low(str: string) {
+  if (str.startsWith("JS")) {
+    return "js" + str.slice(2);
+  }
+
+  return str[0].toLowerCase() + str.slice(1);
+}
+
+export function readdirRecursive(root: string): string[] {
+  const files = fs.readdirSync(root, { withFileTypes: true });
+  return files.flatMap(file => {
+    const fullPath = path.join(root, file.name);
+    return file.isDirectory() ? readdirRecursive(fullPath) : fullPath;
+  });
+}
+
+export function resolveSyncOrNull(specifier: string, from: string) {
+  try {
+    return Bun.resolveSync(specifier, from);
+  } catch {
+    return null;
+  }
+}
+
+export function checkAscii(str: string) {
+  if (!isAscii(Buffer.from(str))) {
+    throw new Error(`non-ascii character in string "${str}". this will not be a valid ASCIILiteral`);
+  }
+
+  return str;
+}
+
+export function writeIfNotChanged(file: string, contents: string) {
+  if (fs.existsSync(file)) {
+    const oldContents = fs.readFileSync(file, "utf8");
+    if (oldContents === contents) {
+      return;
+    }
+  }
+
+  fs.writeFileSync(file, contents);
+}