From c3b965145bc7fb6c798d96b6e992a66b0cb857bd Mon Sep 17 00:00:00 2001
From: Ika <ikatyang@gmail.com>
Date: Sat, 14 Oct 2017 06:53:58 -0500
Subject: [PATCH] feat(markdown): auto-detect which number style of ordered
 list to be used (#3029)

---
 src/printer-markdown.js                           | 15 ++++++++++++++-
 tests/markdown/__snapshots__/jsfmt.spec.js.snap   |  2 +-
 .../__snapshots__/jsfmt.spec.js.snap              | 15 +++++++++++++--
 tests/markdown_list/git-diff-friendly.md          |  3 +++
 .../__snapshots__/jsfmt.spec.js.snap              |  6 +++---
 5 files changed, 34 insertions(+), 7 deletions(-)
 create mode 100644 tests/markdown_list/git-diff-friendly.md

diff --git a/src/printer-markdown.js b/src/printer-markdown.js
index a11c7ac0e..3469a763a 100644
--- a/src/printer-markdown.js
+++ b/src/printer-markdown.js
@@ -175,10 +175,23 @@ function genericPrint(path, options, print) {
         node,
         path.getParentNode()
       );
+
+      const isGitDiffFriendlyOrderedList =
+        node.ordered &&
+        node.children.length > 1 &&
+        /^\s*1(\.|\))/.test(
+          options.originalText.slice(
+            node.children[1].position.start.offset,
+            node.children[1].position.end.offset
+          )
+        );
+
       return printChildren(path, options, print, {
         processor: (childPath, index) => {
           const prefix = node.ordered
-            ? (index === 0 ? node.start : 1) +
+            ? (index === 0
+                ? node.start
+                : isGitDiffFriendlyOrderedList ? 1 : node.start + index) +
               (nthSiblingIndex % 2 === 0 ? ". " : ") ")
             : nthSiblingIndex % 2 === 0 ? "* " : "- ";
           return concat([prefix, align(prefix.length, childPath.call(print))]);
diff --git a/tests/markdown/__snapshots__/jsfmt.spec.js.snap b/tests/markdown/__snapshots__/jsfmt.spec.js.snap
index 14ccb719a..c0d8e3f7c 100644
--- a/tests/markdown/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/markdown/__snapshots__/jsfmt.spec.js.snap
@@ -2243,7 +2243,7 @@ This is a paragraph.
 > ## This is a header.
 >
 > 1. This is the first list item.
-> 1. This is the second list item.
+> 2. This is the second list item.
 >
 > Here's some example code:
 >
diff --git a/tests/markdown_list/__snapshots__/jsfmt.spec.js.snap b/tests/markdown_list/__snapshots__/jsfmt.spec.js.snap
index 269b242d1..d2a582b41 100644
--- a/tests/markdown_list/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/markdown_list/__snapshots__/jsfmt.spec.js.snap
@@ -11,6 +11,17 @@ exports[`checkbox.md 1`] = `
 
 `;
 
+exports[`git-diff-friendly.md 1`] = `
+5. abc
+1. def
+999. ghi
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+5. abc
+1. def
+1. ghi
+
+`;
+
 exports[`long-paragraph.md 1`] = `
 - This is a long long long long long long long long long long long long long long paragraph.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -113,7 +124,7 @@ exports[`start.md 1`] = `
 7. ghi
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 5. abc
-1. def
-1. ghi
+6. def
+7. ghi
 
 `;
diff --git a/tests/markdown_list/git-diff-friendly.md b/tests/markdown_list/git-diff-friendly.md
new file mode 100644
index 000000000..d4ddbe9dc
--- /dev/null
+++ b/tests/markdown_list/git-diff-friendly.md
@@ -0,0 +1,3 @@
+5. abc
+1. def
+999. ghi
diff --git a/tests/markdown_spec/__snapshots__/jsfmt.spec.js.snap b/tests/markdown_spec/__snapshots__/jsfmt.spec.js.snap
index 4e26d910b..ff0403ae7 100644
--- a/tests/markdown_spec/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/markdown_spec/__snapshots__/jsfmt.spec.js.snap
@@ -2765,8 +2765,8 @@ exports[`example-243.md 1`] = `
 3. bar
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1. foo
-1.
-1. bar
+2.
+3. bar
 
 `;
 
@@ -2967,7 +2967,7 @@ exports[`example-261.md 1`] = `
 3) baz
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1. foo
-1. bar
+2. bar
 
 3) baz