From 2a2c366a3e48093740444d970e02774436ccc7ad Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Wed, 24 Dec 2025 09:43:42 +0800
Subject: [PATCH] vim-patch:9.1.2016: cindent wrong indentation after do-while
 loop (#37087)
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Problem:  At "if(0) do if(0); while(0); else", else should be aligned
          with outer if, but is aligned with inner if.
Solution: In function find_match, ignore "if" and "else" inside a
          do-while loop, when looking for "if". (Anttoni Erkkilä)

closes: vim/vim#19004

https://github.com/vim/vim/commit/9d661b057e9f8e4d900b258fa4ed6a265751b7b7

Co-authored-by: Anttoni Erkkilä <anttoni.erkkila@protonmail.com>
---
 src/nvim/indent_c.c               | 40 +++++++++++++++--------------
 test/old/testdir/test_cindent.vim | 42 +++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 19 deletions(-)

diff --git a/src/nvim/indent_c.c b/src/nvim/indent_c.c
index 0f1179bc52..2a30573a0b 100644
--- a/src/nvim/indent_c.c
+++ b/src/nvim/indent_c.c
@@ -3712,16 +3712,29 @@ static int find_match(int lookfor, linenr_T ourscope)
       continue;
     }
 
-    // if it was an "else" (that's not an "else if")
-    // then we need to go back to another if, so
-    // increment elselevel
     look = cin_skipcomment(get_cursor_line_ptr());
-    if (cin_iselse(look)) {
-      mightbeif = cin_skipcomment(look + 4);
-      if (!cin_isif(mightbeif)) {
-        elselevel++;
+    // When looking for if, we ignore "if" and "else" in a deeper do-while loop.
+    if (!(lookfor == LOOKFOR_IF && whilelevel)) {
+      // if it was an "else" (that's not an "else if")
+      // then we need to go back to another if, so
+      // increment elselevel
+      if (cin_iselse(look)) {
+        mightbeif = cin_skipcomment(look + 4);
+        if (!cin_isif(mightbeif)) {
+          elselevel++;
+        }
+        continue;
+      }
+
+      // If it's an "if" decrement elselevel
+      if (cin_isif(look)) {
+        elselevel--;
+        // When looking for an "if" ignore "while"s that
+        // get in the way.
+        if (elselevel == 0 && lookfor == LOOKFOR_IF) {
+          whilelevel = 0;
+        }
       }
-      continue;
     }
 
     // if it was a "while" then we need to go back to
@@ -3731,17 +3744,6 @@ static int find_match(int lookfor, linenr_T ourscope)
       continue;
     }
 
-    // If it's an "if" decrement elselevel
-    look = cin_skipcomment(get_cursor_line_ptr());
-    if (cin_isif(look)) {
-      elselevel--;
-      // When looking for an "if" ignore "while"s that
-      // get in the way.
-      if (elselevel == 0 && lookfor == LOOKFOR_IF) {
-        whilelevel = 0;
-      }
-    }
-
     // If it's a "do" decrement whilelevel
     if (cin_isdo(look)) {
       whilelevel--;
diff --git a/test/old/testdir/test_cindent.vim b/test/old/testdir/test_cindent.vim
index 170da533d1..345f005815 100644
--- a/test/old/testdir/test_cindent.vim
+++ b/test/old/testdir/test_cindent.vim
@@ -1106,6 +1106,27 @@ func Test_cindent_1()
   b;
   }
 
+  void func() {
+  if (0)
+  do
+  if (0);
+  while (0);
+  else;
+  }
+
+  void func() {
+  if (0)
+  do
+  if (0)
+  do
+  if (0)
+  a();
+  while (0);
+  while (0);
+  else
+  a();
+  }
+
   /* end of AUTO */
   [CODE]
 
@@ -2088,6 +2109,27 @@ func Test_cindent_1()
   		  b;
   }
 
+  void func() {
+  	if (0)
+  		do
+  			if (0);
+  		while (0);
+  	else;
+  }
+
+  void func() {
+  	if (0)
+  		do
+  			if (0)
+  				do
+  					if (0)
+  						a();
+  				while (0);
+  		while (0);
+  	else
+  		a();
+  }
+
   /* end of AUTO */
 
   [CODE]