From 4058a3fd85677669f978ba8d11e3b1e2f3903bcd Mon Sep 17 00:00:00 2001
From: William Chargin <wchargin@gmail.com>
Date: Fri, 27 Jul 2018 12:30:28 -0700
Subject: [PATCH] Extract `dedent` to `util`, adding tests (#538)
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Summary:
There have been a couple of occasions on which we’ve considered using
it, but didn’t want to require from `app/`.

Test Plan:
Unit tests added, with full coverage.

wchargin-branch: extract-dedent
---
 src/app/server.js           |  2 +-
 src/{app => util}/dedent.js |  0
 src/util/dedent.test.js     | 47 +++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 1 deletion(-)
 rename src/{app => util}/dedent.js (100%)
 create mode 100644 src/util/dedent.test.js

diff --git a/src/app/server.js b/src/app/server.js
index fbb2eae..db117c4 100644
--- a/src/app/server.js
+++ b/src/app/server.js
@@ -7,7 +7,7 @@ import {match, RouterContext} from "react-router";
 
 import {createRoutes} from "./createRoutes";
 import {resolveTitleFromPath} from "./routeData";
-import dedent from "./dedent";
+import dedent from "../util/dedent";
 
 export default function render(
   locals: {+path: string, +assets: {[string]: string}},
diff --git a/src/app/dedent.js b/src/util/dedent.js
similarity index 100%
rename from src/app/dedent.js
rename to src/util/dedent.js
diff --git a/src/util/dedent.test.js b/src/util/dedent.test.js
new file mode 100644
index 0000000..d8b64bc
--- /dev/null
+++ b/src/util/dedent.test.js
@@ -0,0 +1,47 @@
+// @flow
+
+import dedent from "./dedent";
+
+describe("util/dedent", () => {
+  it("dedents a simple example", () => {
+    const actual = dedent`\
+      hello
+        good
+      world
+    `;
+    const expected = "hello\n  good\nworld\n";
+    expect(actual).toEqual(expected);
+  });
+
+  it("interpolates components", () => {
+    const ell = "l";
+    const actual = dedent`\
+      he${ell}${ell}o
+        good
+      wor${ell}d
+    `;
+    const expected = "hello\n  good\nworld\n";
+    expect(actual).toEqual(expected);
+  });
+
+  it("does not strip leading whitespace in components", () => {
+    // See: https://github.com/wchargin/wchargin.github.io/commit/06475d4cc44a0437c911dd2d4d6275be4381142e
+    const code = 'if (true) {\n  console.log("hi");\n}';
+    const actual = dedent`\
+    <pre><code>${code}</code></pre>
+    `;
+    const expected = `<pre><code>${code}</code></pre>\n`;
+    expect(actual).toEqual(expected);
+  });
+
+  it("does not strip trailing backslashes", () => {
+    // See: https://github.com/wchargin/wchargin.github.io/commit/06475d4cc44a0437c911dd2d4d6275be4381142e
+    const code = "printf '%s' \\\n wat";
+    const actual = dedent`\
+    $ cat foo.sh
+    ${code}
+    `;
+    const expected = `$ cat foo.sh\n${code}\n`;
+    expect(actual).toEqual(expected);
+  });
+});