From 6e5f67808a9f118abc1d32263f98218cc88a1174 Mon Sep 17 00:00:00 2001
From: dpilafian <dem@centerkey.com>
Date: Mon, 7 Mar 2022 00:50:00 -0800
Subject: [PATCH] Support flat mode for copying a single file

#100
---
 index.js |  4 ++++
 test.js  | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/index.js b/index.js
index d2eb105..4abb713 100644
--- a/index.js
+++ b/index.js
@@ -106,6 +106,10 @@ const preprocessDestinationPath = ({entry, destination, options}) => {
 		return path.join(options.cwd, destination, path.basename(entry.pattern.originalPath), path.relative(entry.pattern.originalPath, entry.path));
 	}
 
+	if (!entry.pattern.isDirectory && options.flat) {
+		return path.join(options.cwd, destination, path.basename(entry.pattern.originalPath));
+	}
+
 	return path.join(options.cwd, destination, path.relative(options.cwd, entry.path));
 };
 
diff --git a/test.js b/test.js
index f470c95..4c0c01a 100644
--- a/test.js
+++ b/test.js
@@ -247,6 +247,25 @@ test('flatten directory tree', async t => {
 	);
 });
 
+test('flatten single file', async t => {
+	fs.mkdirSync(t.context.tmp);
+	fs.mkdirSync(path.join(t.context.tmp, 'source'));
+	fs.writeFileSync(
+		path.join(t.context.tmp, 'source/bar.js'),
+		'console.log("bar");',
+	);
+
+	await cpy('source/bar.js', 'destination', {
+		cwd: t.context.tmp,
+		flat: true,
+	});
+
+	t.is(
+		read(t.context.tmp, 'source/bar.js'),
+		read(t.context.tmp, 'destination/bar.js'),
+	);
+});
+
 // TODO: Enable again when ESM supports mocking.
 // eslint-disable-next-line ava/no-skip-test
 test.skip('cp-file errors are CpyErrors', async t => {