1 files changed, 114 insertions, 0 deletions
diff --git a/tools/util.js b/tools/util.js
new file mode 100644
index 000000000..41236e579
--- /dev/null
+++ b/tools/util.js
@@ -0,0 +1,114 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import {
+  dirname,
+  fromFileUrl,
+  join,
+} from "https://deno.land/std@0.76.0/path/mod.ts";
+export { dirname, join };
+export { existsSync } from "https://deno.land/std@0.76.0/fs/mod.ts";
+
+export const ROOT_PATH = dirname(dirname(fromFileUrl(import.meta.url)));
+
+async function getFilesFromGit(baseDir, cmd) {
+  const p = Deno.run({
+    cmd,
+    stdout: "piped",
+  });
+  const { success } = await p.status();
+  if (!success) {
+    throw new Error("gitLsFiles failed");
+  }
+
+  const output = new TextDecoder().decode(await p.output());
+  p.close();
+
+  const files = output.split("\0").filter((line) => line.length > 0).map(
+    (filePath) => {
+      return Deno.realPathSync(join(baseDir, filePath));
+    },
+  );
+
+  return files;
+}
+
+async function gitLsFiles(baseDir, patterns) {
+  baseDir = Deno.realPathSync(baseDir);
+  const cmd = [
+    "git",
+    "-C",
+    baseDir,
+    "ls-files",
+    "-z",
+    "--exclude-standard",
+    "--cached",
+    "--modified",
+    "--others",
+    "--",
+    ...patterns,
+  ];
+  return getFilesFromGit(baseDir, cmd);
+}
+
+/** List all files staged for commit */
+async function gitStaged(baseDir, patterns) {
+  baseDir = Deno.realPathSync(baseDir);
+  const cmd = [
+    "git",
+    "-C",
+    baseDir,
+    "diff",
+    "--staged",
+    "--diff-filter=ACMR",
+    "--name-only",
+    "-z",
+    "--",
+    ...patterns,
+  ];
+  return getFilesFromGit(baseDir, cmd);
+}
+
+/** 
+ *  Recursively list all files in (a subdirectory of) a git worktree.
+ *    * Optionally, glob patterns may be specified to e.g. only list files with a
+ *      certain extension.
+ *    * Untracked files are included, unless they're listed in .gitignore.
+ *    * Directory names themselves are not listed (but the files inside are).
+ *    * Submodules and their contents are ignored entirely.
+ *    * This function fails if the query matches no files.
+ * 
+ * If --staged argument was provided when program is run
+ * only staged sources will be returned.
+ */
+export async function getSources(baseDir, patterns) {
+  const stagedOnly = Deno.args.includes("--staged");
+
+  if (stagedOnly) {
+    return await gitStaged(baseDir, patterns);
+  } else {
+    return await gitLsFiles(baseDir, patterns);
+  }
+}
+
+export function buildMode() {
+  if (Deno.args.includes("--release")) {
+    return "release";
+  }
+
+  return "debug";
+}
+
+export function buildPath() {
+  return join(ROOT_PATH, "target", buildMode());
+}
+
+export function getPrebuiltToolPath(toolName) {
+  const PREBUILT_PATH = join(ROOT_PATH, "third_party", "prebuilt");
+
+  const platformDirName = {
+    "windows": "win",
+    "darwin": "mac",
+    "linux": "linux64",
+  }[Deno.build.os];
+  const executableSuffix = Deno.build.os === "windows" ? ".exe" : "";
+  return join(PREBUILT_PATH, platformDirName, toolName + executableSuffix);
+}