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Editing: meson.vim

" Vim indent file
" Language:		Meson
" License:		VIM License
" Maintainer:		Nirbheek Chauhan <nirbheek.chauhan@gmail.com>
"	        	Liam Beguin <liambeguin@gmail.com>
" Original Authors:	David Bustos <bustos@caltech.edu>
"			Bram Moolenaar <Bram@vim.org>
" Last Change:		2019 Oct 18

" Only load this indent file when no other was loaded.
if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

" Some preliminary settings
setlocal nolisp		" Make sure lisp indenting doesn't supersede us
setlocal autoindent	" indentexpr isn't much help otherwise

setlocal indentexpr=GetMesonIndent(v:lnum)
setlocal indentkeys+==elif,=else,=endforeach,=endif,0)

let b:undo_indent = "setl ai< inde< indk< lisp<"

" Only define the function once.
if exists("*GetMesonIndent")
  finish
endif
let s:keepcpo= &cpo
set cpo&vim

" Come here when loading the script the first time.

let s:maxoff = 50	" maximum number of lines to look backwards for ()

function GetMesonIndent(lnum)
  echom getline(line("."))

" If this line is explicitly joined: If the previous line was also joined,
  " line it up with that one, otherwise add two 'shiftwidth'
  if getline(a:lnum - 1) =~ '\\$'
    if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$'
      return indent(a:lnum - 1)
    endif
    return indent(a:lnum - 1) + (exists("g:mesonindent_continue") ? eval(g:mesonindent_continue) : (shiftwidth() * 2))
  endif

" If the start of the line is in a string don't change the indent.
  if has('syntax_items')
	\ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
    return -1
  endif

" Search backwards for the previous non-empty line.
  let plnum = prevnonblank(v:lnum - 1)

if plnum == 0
    " This is the first non-empty line, use zero indent.
    return 0
  endif

" If the previous line is inside parenthesis, use the indent of the starting
  " line.
  " Trick: use the non-existing "dummy" variable to break out of the loop when
  " going too far back.
  call cursor(plnum, 1)
  let parlnum = searchpair('(\|{\|\[', '', ')\|}\|\]', 'nbW',
	  \ "line('.') < " . (plnum - s:maxoff) . " ? dummy :"
	  \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
	  \ . " =~ '\$Comment\\|Todo\\|String\$$'")
  if parlnum > 0
    let plindent = indent(parlnum)
    let plnumstart = parlnum
  else
    let plindent = indent(plnum)
    let plnumstart = plnum
  endif

" When inside parenthesis: If at the first line below the parenthesis add
  " a 'shiftwidth', otherwise same as previous line.
  " i = (a
  "       + b
  "       + c)
  call cursor(a:lnum, 1)
  let p = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
	  \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
	  \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
	  \ . " =~ '\$Comment\\|Todo\\|String\$$'")
  if p > 0
    if p == plnum
      " When the start is inside parenthesis, only indent one 'shiftwidth'.
      let pp = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
	  \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
	  \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
	  \ . " =~ '\$Comment\\|Todo\\|String\$$'")
      if pp > 0
	return indent(plnum) + (exists("g:pyindent_nested_paren") ? eval(g:pyindent_nested_paren) : shiftwidth())
      endif
      return indent(plnum) + (exists("g:pyindent_open_paren") ? eval(g:pyindent_open_paren) : shiftwidth())
    endif
    if plnumstart == p
      return indent(plnum)
    endif
    return plindent
  endif

" Get the line and remove a trailing comment.
  " Use syntax highlighting attributes when possible.
  let pline = getline(plnum)
  let pline_len = strlen(pline)
  if has('syntax_items')
    " If the last character in the line is a comment, do a binary search for
    " the start of the comment.  synID() is slow, a linear search would take
    " too long on a long line.
    if synIDattr(synID(plnum, pline_len, 1), "name") =~ "\$Comment\\|Todo\$$"
      let min = 1
      let max = pline_len
      while min < max
	let col = (min + max) / 2
	if synIDattr(synID(plnum, col, 1), "name") =~ "\$Comment\\|Todo\$$"
	  let max = col
	else
	  let min = col + 1
	endif
      endwhile
      let pline = strpart(pline, 0, min - 1)
    endif
  else
    let col = 0
    while col < pline_len
      if pline[col] == '#'
	let pline = strpart(pline, 0, col)
	break
      endif
      let col = col + 1
    endwhile
  endif

" If the previous line ended the conditional/loop
  if getline(plnum) =~ '^\s*$endif\|endforeach$\>\s*'
    " Maintain indent
    return -1
  endif

" If the previous line ended with a builtin, indent this line
  if pline =~ '^\s*$foreach\|if\|else\|elif$\>\s*'
    return plindent + shiftwidth()
  endif

" If the current line begins with a header keyword, deindent
  if getline(a:lnum) =~ '^\s*$else\|elif\|endif\|endforeach$'

" Unless the previous line was a one-liner
    if getline(plnumstart) =~ '^\s*$foreach\|if$\>\s*'
      return plindent
    endif

" Or the user has already dedented
    if indent(a:lnum) <= plindent - shiftwidth()
      return -1
    endif

return plindent - shiftwidth()
  endif

" When after a () construct we probably want to go back to the start line.
  " a = (b
  "       + c)
  " here
  if parlnum > 0
    return plindent
  endif

return -1

endfunction

let &cpo = s:keepcpo
unlet s:keepcpo

" vim:sw=2

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