1 files changed, 78 insertions, 0 deletions
diff --git a/runtime/indent/nginx.vim b/runtime/indent/nginx.vim
new file mode 100644
index 0000000..6550609
--- /dev/null
+++ b/runtime/indent/nginx.vim
@@ -0,0 +1,78 @@
+" Vim indent file
+" Language: nginx.conf
+" Maintainer: Chris Aumann <me@chr4.org>
+" Last Change:  2022 Dec 01
+
+" Only load this indent file when no other was loaded.
+if exists('b:did_indent')
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetNginxIndent()
+
+setlocal indentkeys=0{,0},0#,!^F,o,O
+
+let b:undo_indent = 'setl inde< indk<'
+
+" Only define the function once.
+if exists('*GetNginxIndent')
+  finish
+endif
+
+function GetNginxIndent() abort
+  let plnum = s:PrevNotAsBlank(v:lnum - 1)
+
+  " Hit the start of the file, use zero indent.
+  if plnum == 0
+    return 0
+  endif
+
+  let ind = indent(plnum)
+
+  " Add a 'shiftwidth' after '{'
+  if s:AsEndWith(getline(plnum), '{')
+    let ind = ind + shiftwidth()
+  end
+
+  " Subtract a 'shiftwidth' on '}'
+  " This is the part that requires 'indentkeys'.
+  if getline(v:lnum) =~ '^\s*}'
+    let ind = ind - shiftwidth()
+  endif
+
+  let pplnum = s:PrevNotAsBlank(plnum - 1)
+
+  if s:IsLineContinuation(plnum)
+    if !s:IsLineContinuation(pplnum)
+      let ind = ind + shiftwidth()
+    end
+  else
+    if s:IsLineContinuation(pplnum)
+      let ind = ind - shiftwidth()
+    end
+  endif
+
+  return ind
+endfunction
+
+" Find the first line at or above {lnum} that is non-blank and not a comment.
+function s:PrevNotAsBlank(lnum) abort
+  let lnum = prevnonblank(a:lnum)
+  while lnum > 0
+    if getline(lnum) !~ '^\s*#'
+      break
+    endif
+    let lnum = prevnonblank(lnum - 1)
+  endwhile
+  return lnum
+endfunction
+
+" Check whether {line} ends with {pat}, ignoring trailing comments.
+function s:AsEndWith(line, pat) abort
+  return a:line =~ a:pat . '\m\s*\%(#.*\)\?$'
+endfunction
+
+function s:IsLineContinuation(lnum) abort
+  return a:lnum > 0 && !s:AsEndWith(getline(a:lnum), '[;{}]')
+endfunction