1 files changed, 69 insertions, 0 deletions
diff --git a/runtime/indent/postscr.vim b/runtime/indent/postscr.vim
new file mode 100644
index 0000000..8430ccf
--- /dev/null
+++ b/runtime/indent/postscr.vim
@@ -0,0 +1,69 @@
+" PostScript indent file
+" Language:	PostScript
+" Maintainer:	Mike Williams <mrw@eandem.co.uk>
+" Last Change:	2022 Apr 06
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=PostscrIndentGet(v:lnum)
+setlocal indentkeys+=0],0=>>,0=%%,0=end,0=restore,0=grestore indentkeys-=:,0#,e
+
+let b:undo_indent = "setl inde< indk<"
+
+" Catch multiple instantiations
+if exists("*PostscrIndentGet")
+  finish
+endif
+
+function! PostscrIndentGet(lnum)
+  " Find a non-empty non-comment line above the current line.
+  " Note: ignores DSC comments as well!
+  let lnum = a:lnum - 1
+  while lnum != 0
+    let lnum = prevnonblank(lnum)
+    if getline(lnum) !~ '^\s*%.*$'
+      break
+    endif
+    let lnum = lnum - 1
+  endwhile
+
+  " Hit the start of the file, use user indent.
+  if lnum == 0
+    return -1
+  endif
+
+  " Start with the indent of the previous line
+  let ind = indent(lnum)
+  let pline = getline(lnum)
+
+  " Indent for dicts, arrays, and saves with possible trailing comment
+  if pline =~ '\(begin\|<<\|g\=save\|{\|[\)\s*\(%.*\)\=$'
+    let ind = ind + shiftwidth()
+  endif
+
+  " Remove indent for popped dicts, and restores.
+  if pline =~ '\(end\|g\=restore\)\s*$'
+    let ind = ind - shiftwidth()
+
+  " Else handle immediate dedents of dicts, restores, and arrays.
+  elseif getline(a:lnum) =~ '\(end\|>>\|g\=restore\|}\|]\)'
+    let ind = ind - shiftwidth()
+
+  " Else handle DSC comments - always start of line.
+  elseif getline(a:lnum) =~ '^\s*%%'
+    let ind = 0
+  endif
+
+  " For now catch excessive left indents if they occur.
+  if ind < 0
+    let ind = -1
+  endif
+
+  return ind
+endfunction
+
+" vim:sw=2