From 802f78f0fa18c5303ec86092df8563d6187527bf Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Tue, 2 Apr 2024 16:58:33 +0200
Subject: [PATCH] table-pipe-alignment: fix empty centered cell

Closes GH-312.
---
 .../remark-lint-table-pipe-alignment/index.js | 18 +++++++++++++---
 .../readme.md                                 | 21 +++++++++++++++++++
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/packages/remark-lint-table-pipe-alignment/index.js b/packages/remark-lint-table-pipe-alignment/index.js
index 8a70fc99..3afc03a2 100644
--- a/packages/remark-lint-table-pipe-alignment/index.js
+++ b/packages/remark-lint-table-pipe-alignment/index.js
@@ -89,6 +89,17 @@
  *   | ------- | ---------- | --- |
  *   | Mercury |            |     |
  *
+ *   | aaa | bbb | ccc | ddd |
+ *   | --- | :-- | :-: | --: |
+ *   |     |     |     |     |
+ *
+ * @example
+ *   {"gfm": true, "name": "aligned-pipes-but-weird-content.md"}
+ *
+ *   | Planet | Moon | Mercury | Venus | Sun | Mars | Jupiter | Saturn |
+ *   | ------ | ---- | :------ | :---- | --: | ---: | :-----: | :----: |
+ *   | Symbol |    ☾ | ☿       |   ♀   | ☉   |   ♂  | ♃       |      ♄ |
+ *
  * @example
  *   {"gfm": true, "name": "missing-cells.md"}
  *
@@ -277,9 +288,8 @@ const remarkLintTablePipeAlignment = lintRule(
         let left = 0
         let right = 0
 
-        if (info.align === 'right') {
-          left = difference
-        } else if (info.align === 'center') {
+        // Center if there is something to center.
+        if (info.align === 'center' && info.size.middle && difference > 0) {
           // Maximum number of spaces we would want on the left.
           const max = Math.floor((sizes[info.column] - info.size.middle) / 2)
 
@@ -288,6 +298,8 @@ const remarkLintTablePipeAlignment = lintRule(
           }
 
           left = difference - right
+        } else if (info.align === 'right') {
+          left = difference
         } else {
           right = difference
         }
diff --git a/packages/remark-lint-table-pipe-alignment/readme.md b/packages/remark-lint-table-pipe-alignment/readme.md
index cc14187f..0f622fd6 100644
--- a/packages/remark-lint-table-pipe-alignment/readme.md
+++ b/packages/remark-lint-table-pipe-alignment/readme.md
@@ -212,6 +212,27 @@ No messages.
 |         | Satellites |     |
 | ------- | ---------- | --- |
 | Mercury |            |     |
+
+| aaa | bbb | ccc | ddd |
+| --- | :-- | :-: | --: |
+|     |     |     |     |
+```
+
+###### Out
+
+No messages.
+
+##### `aligned-pipes-but-weird-content.md`
+
+###### In
+
+> 👉 **Note**: this example uses
+> GFM ([`remark-gfm`][github-remark-gfm]).
+
+```markdown
+| Planet | Moon | Mercury | Venus | Sun | Mars | Jupiter | Saturn |
+| ------ | ---- | :------ | :---- | --: | ---: | :-----: | :----: |
+| Symbol |    ☾ | ☿       |   ♀   | ☉   |   ♂  | ♃       |      ♄ |
 ```
 
 ###### Out