From 52a738b89278e15a4d22418c68e4a142d849bca3 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sat, 14 Jul 2018 23:51:34 +1200
Subject: Adaptive 'colorcolumn' for gitcommit filetype

---
 vim/after/ftplugin/gitcommit.vim | 10 ++++++++++
 vim/autoload/gitcommit.vim       | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 vim/autoload/gitcommit.vim

(limited to 'vim')

diff --git a/vim/after/ftplugin/gitcommit.vim b/vim/after/ftplugin/gitcommit.vim
index 4f57a407..d390fa3c 100644
--- a/vim/after/ftplugin/gitcommit.vim
+++ b/vim/after/ftplugin/gitcommit.vim
@@ -8,6 +8,16 @@ setlocal comments+=n:>
 setlocal formatoptions+=coqr
 let b:undo_ftplugin .= '|setlocal comments< formatoptions<'
 
+" Choose the color column depending on non-comment line count
+if exists('+cursorcolumn')
+  augroup gitcommit
+    autocmd CursorMoved,CursorMovedI <buffer>
+            \ let &l:colorcolumn = gitcommit#CursorColumn()
+  augroup END
+  let b:undo_ftplugin .= '|autocmd! gitcommit'
+        \ . '|augroup! gitcommit'
+endif
+
 " Stop here if the user doesn't want ftplugin mappings
 if exists('g:no_plugin_maps') || exists('g:no_gitcommit_maps')
   finish
diff --git a/vim/autoload/gitcommit.vim b/vim/autoload/gitcommit.vim
new file mode 100644
index 00000000..56b35ba6
--- /dev/null
+++ b/vim/autoload/gitcommit.vim
@@ -0,0 +1,20 @@
+" Choose the color column depending on non-comment line count
+function! gitcommit#CursorColumn() abort
+
+  " Last line number
+  let l:ll = line('$')
+
+  " If we can find a line after the first that isn't a comment, we're
+  " composing the message
+  if l:ll > 1
+    for l:li in range(2, l:ll)
+      if getline(l:li) !~# '^\s*#'
+        return '+1'
+      endif
+    endfor
+  endif
+
+  " Otherwise, we're still composing our subject
+  return '51'
+
+endfunction
-- 
cgit v1.2.3