1 files changed, 87 insertions, 0 deletions
diff --git a/runtime/indent/ld.vim b/runtime/indent/ld.vim
new file mode 100644
index 0000000..ddf003e
--- /dev/null
+++ b/runtime/indent/ld.vim
@@ -0,0 +1,87 @@
+" Vim indent file
+" Language:		ld(1) script
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		24 Sep 2021
+
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetLDIndent()
+setlocal indentkeys=0{,0},!^F,o,O
+setlocal nosmartindent
+
+let b:undo_indent = "setl inde< indk< si<"
+
+if exists("*GetLDIndent")
+  finish
+endif
+
+function s:prevnonblanknoncomment(lnum)
+  let lnum = a:lnum
+  while lnum > 1
+    let lnum = prevnonblank(lnum)
+    let line = getline(lnum)
+    if line =~ '\*/'
+      while lnum > 1 && line !~ '/\*'
+        let lnum -= 1
+      endwhile
+      if line =~ '^\s*/\*'
+        let lnum -= 1
+      else
+        break
+      endif
+    else
+      break
+    endif
+  endwhile
+  return lnum
+endfunction
+
+function s:count_braces(lnum, count_open)
+  let n_open = 0
+  let n_close = 0
+  let line = getline(a:lnum)
+  let pattern = '[{}]'
+  let i = match(line, pattern)
+  while i != -1
+    if synIDattr(synID(a:lnum, i + 1, 0), 'name') !~ 'ld\%(Comment\|String\)'
+      if line[i] == '{'
+        let n_open += 1
+      elseif line[i] == '}'
+        if n_open > 0
+          let n_open -= 1
+        else
+          let n_close += 1
+        endif
+      endif
+    endif
+    let i = match(line, pattern, i + 1)
+  endwhile
+  return a:count_open ? n_open : n_close
+endfunction
+
+function GetLDIndent()
+  let line = getline(v:lnum)
+  if line =~ '^\s*\*'
+    return cindent(v:lnum)
+  elseif line =~ '^\s*}'
+    return indent(v:lnum) - shiftwidth()
+  endif
+
+  let pnum = s:prevnonblanknoncomment(v:lnum - 1)
+  if pnum == 0
+    return 0
+  endif
+
+  let ind = indent(pnum) + s:count_braces(pnum, 1) * shiftwidth()
+
+  let pline = getline(pnum)
+  if pline =~ '}\s*$'
+    let ind -= (s:count_braces(pnum, 0) - (pline =~ '^\s*}' ? 1 : 0)) * shiftwidth()
+  endif
+
+  return ind
+endfunction