From 922268fbd89a49991b5b5b73e969f8daa8a10263 Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Mon, 9 Oct 2017 04:18:35 +0200
Subject: [PATCH] Improve s:find_start_of_multiline_statement: only look for
 round parens

---
 indent/python.vim | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/indent/python.vim b/indent/python.vim
index 20469e2..22ca76f 100644
--- a/indent/python.vim
+++ b/indent/python.vim
@@ -45,6 +45,10 @@ let s:block_rules_multiple = {
 " Pairs to look for when searching for opening parenthesis.
 " The value is the maximum offset in lines.
 let s:paren_pairs = {'()': 10, '[]': 100, '{}': 1000}
+
+" Maximum offset when looking for multiline statements (in round parenthesis).
+let s:maxoff_multiline_statement = 50
+
 if &filetype ==# 'pyrex' || &filetype ==# 'cython'
     let b:control_statement = '\v^\s*(class|def|if|while|with|for|except|cdef|cpdef)>'
 else
@@ -121,19 +125,21 @@ function! s:find_opening_paren(...)
     return nearest
 endfunction
 
-" Find the start of a multi-line statement
+" Find the start of a multi-line statement (based on surrounding parens).
 function! s:find_start_of_multiline_statement(lnum)
     let lnum = a:lnum
     while lnum > 0
+        " XXX: not tested?!
         if getline(lnum - 1) =~# '\\$'
             let lnum = prevnonblank(lnum - 1)
         else
-            let [paren_lnum, _] = s:find_opening_paren(lnum)
-            if paren_lnum < 1
-                return lnum
-            else
-                let lnum = paren_lnum
+            call cursor(lnum, 1)
+            let stopline = max([1, lnum - s:maxoff_multiline_statement])
+            let pos = searchpairpos('\V(', '', '\V)', 'bnW', s:skip_special_chars, stopline)
+            if pos[0]
+                return pos[0]
             endif
+            return lnum
         endif
     endwhile
 endfunction
-- 
2.39.2