" Vim indent file
" Language: Kyn
" Maintainer: Gemini

if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentexpr=GetKynIndent()
setlocal indentkeys+=={,},0)

let b:undo_indent = "setlocal indentexpr< indentkeys<"

" Only define the function once
if exists("*GetKynIndent")
  finish
endif

function GetKynIndent()
  " Get the line number of the current line
  let lnum = v:lnum

  " Get the current line
  let cline = getline(lnum)

  " If the current line has a '}', decrease indent
  if cline =~ '^\s*}'
    let lnum = prevnonblank(lnum - 1)
    return indent(lnum)
  endif

  " Find the previous non-blank line
  let lnum = prevnonblank(lnum - 1)

  " At the start of the file, no indent
  if lnum == 0
    return 0
  endif

  " Get the indent of the previous line
  let prev_indent = indent(lnum)
  let prev_line = getline(lnum)

  " If the previous line ends with '{', increase indent
  if prev_line =~ '{\s*$'
    return prev_indent + &shiftwidth
  endif

  " Otherwise, keep the same indent
  return prev_indent
endfunction