From f30e1f269f079a71bd677da595d3c155b14fddb3 Mon Sep 17 00:00:00 2001
From: Bret Comnes <bcomnes@gmail.com>
Date: Sat, 6 Jul 2019 13:50:56 +0200
Subject: [PATCH 1/4] Add failing test for external map file path creation

---
 index.js          |  6 ++----
 lib/getMapfile.js |  6 ++++++
 test/map.js       | 19 +++++++++++++++++++
 3 files changed, 27 insertions(+), 4 deletions(-)
 create mode 100644 lib/getMapfile.js

diff --git a/index.js b/index.js
index f96c07f..8d79228 100644
--- a/index.js
+++ b/index.js
@@ -16,6 +16,7 @@ const reporter = require('postcss-reporter/lib/formatter')()
 
 const argv = require('./lib/args')
 const depGraph = require('./lib/depGraph')
+const getMapfile = require('./lib/getMapfile')
 
 let input = argv._
 const { dir, output } = argv
@@ -221,10 +222,7 @@ function css(css, file) {
             tasks.push(fs.outputFile(options.to, result.css))
 
             if (result.map) {
-              const mapfile = options.to.replace(
-                path.extname(options.to),
-                `${path.extname(options.to)}.map`
-              )
+              const mapfile = getMapfile(options.to)
               tasks.push(fs.outputFile(mapfile, result.map))
             }
           } else process.stdout.write(result.css, 'utf8')
diff --git a/lib/getMapfile.js b/lib/getMapfile.js
new file mode 100644
index 0000000..5060574
--- /dev/null
+++ b/lib/getMapfile.js
@@ -0,0 +1,6 @@
+'use strict'
+const path = require('path')
+
+module.exports = function getMapfile(p) {
+  return p.replace(path.extname(p), `${path.extname(p)}.map`)
+}
diff --git a/test/map.js b/test/map.js
index 53880d8..663d505 100644
--- a/test/map.js
+++ b/test/map.js
@@ -5,6 +5,8 @@ import cli from './helpers/cli.js'
 import tmp from './helpers/tmp.js'
 import read from './helpers/read.js'
 
+import getMapfile from '../lib/getMapfile'
+
 test('inline maps are generated by default', async t => {
   const output = tmp('output.css')
 
@@ -53,3 +55,20 @@ test('--no-map disables internal sourcemaps', async t => {
 
   t.notRegex(await read(output), /\/*# sourceMappingURL=/)
 })
+
+test('mapFile path is property resolved', async t => {
+  const paths = [
+    {
+      input: '/foo/bar.css/baz/index.css',
+      want: '/foo/bar.css/baz/index.css.map'
+    },
+    {
+      input: '/foo/bar.sss/baz/index.sss',
+      want: '/foo/bar.sss/baz/index.sss.map'
+    }
+  ]
+
+  for (const p of paths) {
+    t.is(getMapfile(p.input), p.want)
+  }
+})

From 69050d7576ebb5010bc2432374fe9e1612b33c3d Mon Sep 17 00:00:00 2001
From: Bret Comnes <bcomnes@gmail.com>
Date: Sat, 6 Jul 2019 13:55:34 +0200
Subject: [PATCH 2/4] Write passing map file implementation

Can we just append + '.map'?
---
 lib/getMapfile.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/getMapfile.js b/lib/getMapfile.js
index 5060574..625897a 100644
--- a/lib/getMapfile.js
+++ b/lib/getMapfile.js
@@ -2,5 +2,7 @@
 const path = require('path')
 
 module.exports = function getMapfile(p) {
-  return p.replace(path.extname(p), `${path.extname(p)}.map`)
+  const ext = path.extname(p)
+  const base = path.basename(p)
+  return p.replace(base, base.replace(ext, `${ext}.map`))
 }

From 0da0cc84fbf2a9b500a68987d0b3ea8665679558 Mon Sep 17 00:00:00 2001
From: Bret Comnes <bcomnes@gmail.com>
Date: Sat, 6 Jul 2019 14:22:50 +0200
Subject: [PATCH 3/4] Add additional failing example

---
 test/map.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/map.js b/test/map.js
index 663d505..b944cd5 100644
--- a/test/map.js
+++ b/test/map.js
@@ -65,6 +65,10 @@ test('mapFile path is property resolved', async t => {
     {
       input: '/foo/bar.sss/baz/index.sss',
       want: '/foo/bar.sss/baz/index.sss.map'
+    },
+    {
+      input: '/foo/bar.css/baz/bar.css',
+      want: '/foo/bar.css/baz/bar.css.map'
     }
   ]
 

From ee41093db26c7b03f9a7924d82df902ff9f192ad Mon Sep 17 00:00:00 2001
From: Bret Comnes <bcomnes@gmail.com>
Date: Sat, 6 Jul 2019 14:26:35 +0200
Subject: [PATCH 4/4] Simplify implementation

---
 lib/getMapfile.js | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/lib/getMapfile.js b/lib/getMapfile.js
index 625897a..b9dd441 100644
--- a/lib/getMapfile.js
+++ b/lib/getMapfile.js
@@ -1,8 +1,4 @@
 'use strict'
-const path = require('path')
-
 module.exports = function getMapfile(p) {
-  const ext = path.extname(p)
-  const base = path.basename(p)
-  return p.replace(base, base.replace(ext, `${ext}.map`))
+  return `${p}.map`
 }