1 files changed, 75 insertions, 0 deletions
diff --git a/runtime/indent/cs.vim b/runtime/indent/cs.vim
new file mode 100644
index 0000000..acc3ba7
--- /dev/null
+++ b/runtime/indent/cs.vim
@@ -0,0 +1,75 @@
+" Vim indent file
+" Language:            C#
+" Maintainer:          Nick Jensen <nickspoon@gmail.com>
+" Former Maintainers:  Aquila Deus
+"                      Johannes Zellner <johannes@zellner.org>
+" Last Change:         2020-03-26
+" License:             Vim (see :h license)
+" Repository:          https://github.com/nickspoons/vim-cs
+
+if exists('b:did_indent')
+  finish
+endif
+let b:did_indent = 1
+
+let s:save_cpo = &cpoptions
+set cpoptions&vim
+
+
+setlocal indentexpr=GetCSIndent(v:lnum)
+
+function! s:IsCompilerDirective(line)
+  " Exclude #region and #endregion - these should be indented normally
+  return a:line =~# '^\s*#' && !s:IsRegionDirective(a:line)
+endf
+
+function! s:IsRegionDirective(line)
+  return a:line =~# '^\s*#\s*region' || a:line =~# '^\s*#\s*endregion'
+endf
+
+function! s:IsAttributeLine(line)
+  return a:line =~# '^\s*\[[A-Za-z]' && a:line =~# '\]$'
+endf
+
+function! s:FindPreviousNonCompilerDirectiveLine(start_lnum)
+  for delta in range(0, a:start_lnum)
+    let lnum = a:start_lnum - delta
+    let line = getline(lnum)
+    if !s:IsCompilerDirective(line) && !s:IsRegionDirective(line)
+      return lnum
+    endif
+  endfor
+  return 0
+endf
+
+function! GetCSIndent(lnum) abort
+  " Hit the start of the file, use zero indent.
+  if a:lnum == 0
+    return 0
+  endif
+
+  let this_line = getline(a:lnum)
+
+  " Compiler directives use zero indent if so configured.
+  let is_first_col_macro = s:IsCompilerDirective(this_line) && stridx(&l:cinkeys, '0#') >= 0
+  if is_first_col_macro
+    return cindent(a:lnum)
+  endif
+
+  let lnum = s:FindPreviousNonCompilerDirectiveLine(a:lnum - 1)
+  let previous_code_line = getline(lnum)
+  if s:IsAttributeLine(previous_code_line)
+    return indent(lnum)
+  elseif s:IsRegionDirective(this_line)
+    return cindent(lnum)
+  else
+    return cindent(a:lnum)
+  endif
+endfunction
+
+let b:undo_indent = 'setlocal indentexpr<'
+
+let &cpoptions = s:save_cpo
+unlet s:save_cpo
+
+" vim:et:sw=2:sts=2