From 7c2114f57909d9546184aaf7d0b833ce1cc0f4e8 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 29 Oct 2017 03:38:46 -0400
Subject: better handling of backspacing inside brackets after pressing enter

---
 vimrc | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'vimrc')

diff --git a/vimrc b/vimrc
index a67b20e..b7f66d7 100644
--- a/vimrc
+++ b/vimrc
@@ -479,6 +479,7 @@ let g:pair_bs_maps = {
 \    '(': "<SID>maybe_remove_empty_pair(')')",
 \    '[': "<SID>maybe_remove_empty_pair(']')",
 \    '{': "<SID>maybe_remove_empty_pair('}')",
+\    '': "<SID>maybe_collapse_pair()",
 \}
 function s:maybe_remove_matching_pair()
     return eval(g:pair_bs_maps[s:prevchar()])
@@ -511,6 +512,34 @@ function s:maybe_remove_empty_pair(char)
         return "\<Esc>" . (l:diff[0] + 1) . "Ji" . "\<BS>\<BS>\<Del>"
     endif
 endfunction
+let g:pair_chars = {
+\    '(': ')',
+\    '[': ']',
+\    '{': '}',
+\}
+function s:maybe_collapse_pair()
+    let l:prev_line_idx = line('.') - 1
+    if l:prev_line_idx < 1
+        return "\<BS>"
+    endif
+
+    let l:prev_line_char = getline(l:prev_line_idx)[col([l:prev_line_idx, '$'])-2]
+    if l:prev_line_char !~ '[([{]'
+        return "\<BS>"
+    endif
+
+    let l:end = searchpos('[^ \t]', 'cnWz')
+    if l:end == [0, 0]
+        return "\<BS>"
+    endif
+
+    let l:next_nonblank = getline(l:end[0])[l:end[1] - 1]
+    if l:next_nonblank != g:pair_chars[l:prev_line_char]
+        return "\<BS>"
+    endif
+
+    return "\<BS>\<Del>"
+endfunction
 function s:skip_closing_char(char)
     if s:nextchar() == a:char
         return "\<Esc>la"
-- 
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