From ae588c183f030878d330fa4fb010c48ce14c34e2 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Fri, 12 Sep 2025 06:33:37 +0800
Subject: [PATCH] vim-patch:9.1.1754: :helptags doesn't skip examples with
 syntax

Problem:  :helptags doesn't skip examples with syntax
          (Evgeni Chasnovski)
Solution: Check for examples with syntax (zeertzjq).

fixes: vim/vim#18273
closes: vim/vim#18277

https://github.com/vim/vim/commit/6f020cde569073622cc085251e47d82323d5c4bd
---
 src/nvim/help.c                | 13 +++++++++----
 test/old/testdir/test_help.vim | 10 ++++++++--
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/nvim/help.c b/src/nvim/help.c
index f88670c31d..745c133c0e 100644
--- a/src/nvim/help.c
+++ b/src/nvim/help.c
@@ -939,10 +939,15 @@ static void helptags_one(char *dir, const char *ext, const char *tagfname, bool
         }
         p1 = p2;
       }
-      size_t len = strlen(IObuff);
-      if ((len == 2 && strcmp(&IObuff[len - 2], ">\n") == 0)
-          || (len >= 3 && strcmp(&IObuff[len - 3], " >\n") == 0)) {
-        in_example = true;
+      size_t off = strlen(IObuff);
+      if (off >= 2 && IObuff[off - 1] == '\n') {
+        off -= 2;
+        while (off > 0 && (ASCII_ISLOWER(IObuff[off]) || ascii_isdigit(IObuff[off]))) {
+          off--;
+        }
+        if (IObuff[off] == '>' && (off == 0 || IObuff[off - 1] == ' ')) {
+          in_example = true;
+        }
       }
       line_breakcheck();
     }
diff --git a/test/old/testdir/test_help.vim b/test/old/testdir/test_help.vim
index 2befcad6b8..d2943e1b96 100644
--- a/test/old/testdir/test_help.vim
+++ b/test/old/testdir/test_help.vim
@@ -157,11 +157,17 @@ func Test_helptag_cmd()
   call delete('Xtagdir/tags')
 
   " Test parsing tags
-  call writefile(['*tag1*', 'Example: >', '  *notag*', 'Example end: *tag2*'],
+  call writefile(['*tag1*', 'Example: >', '  *notag1*', 'Example end: *tag2*',
+                \ '>', '  *notag2*', '<',
+                \ '*tag3*', 'Code: >vim', '  *notag3*', 'Code end: *tag4*',
+                \ '>i3config', '  *notag4*', '<'],
     \ 'Xtagdir/a/doc/sample.txt')
   helptags Xtagdir
   call assert_equal(["tag1\ta/doc/sample.txt\t/*tag1*",
-                  \  "tag2\ta/doc/sample.txt\t/*tag2*"], readfile('Xtagdir/tags'))
+                   \ "tag2\ta/doc/sample.txt\t/*tag2*",
+                   \ "tag3\ta/doc/sample.txt\t/*tag3*",
+                   \ "tag4\ta/doc/sample.txt\t/*tag4*"],
+    \ readfile('Xtagdir/tags'))
 
   " Duplicate tags in the help file
   call writefile(['*tag1*', '*tag1*', '*tag2*'], 'Xtagdir/a/doc/sample.txt')