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" MetaPost indent file
" Language: MetaPost
" Maintainer: Eugene Minkovskii <emin@mccme.ru>
" Last Change: 2012 May 18
" Version: 0.1
" ==========================================================================
" Identation Rules: {{{1
" First of all, MetaPost language don't expect any identation rules.
" This screept need for you only if you (not MetaPost) need to do
" exactly code. If you don't need to use indentation, see
" :help filetype-indent-off
"
" Note: Every rules of identation in MetaPost or TeX languages (and in some
" other of course) is very subjective. I can release only my vision of this
" promlem.
"
" ..........................................................................
" Example of correct (by me) identation {{{2
" shiftwidth=4
" ==========================================================================
" for i=0 upto 99:
" z[i] = (0,1u) rotated (i*360/100);
" endfor
" draw z0 -- z10 -- z20
" withpen ... % <- 2sw because breaked line
" withcolor ...; % <- same as previous
" draw z0 for i=1 upto 99:
" -- z[i] % <- 1sw from left end of 'for' satement
" endfor withpen ... % <- 0sw from left end of 'for' satement
" withcolor ...; % <- 2sw because breaked line
" draw if One: % <- This is internal if (like 'for' above)
" one
" elsif Other:
" other
" fi withpen ...;
" if one: % <- This is external if
" draw one;
" elseif other:
" draw other;
" fi
" draw z0; draw z1;
" }}}
" }}}
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetMetaPostIndent()
setlocal indentkeys+=;,<:>,=if,=for,=def,=end,=else,=fi
" Only define the function once.
if exists("*GetMetaPostIndent")
finish
endif
let s:keepcpo= &cpo
set cpo&vim
" Auxiliary Definitions: {{{1
function! MetaNextNonblankNoncomment(pos)
" Like nextnonblank() but ignore comment lines
let tmp = nextnonblank(a:pos)
while tmp && getline(tmp) =~ '^\s*%'
let tmp = nextnonblank(tmp+1)
endwhile
return tmp
endfunction
function! MetaPrevNonblankNoncomment(pos)
" Like prevnonblank() but ignore comment lines
let tmp = prevnonblank(a:pos)
while tmp && getline(tmp) =~ '^\s*%'
let tmp = prevnonblank(tmp-1)
endwhile
return tmp
endfunction
function! MetaSearchNoncomment(pattern, ...)
" Like search() but ignore commented areas
if a:0
let flags = a:1
elseif &wrapscan
let flags = "w"
else
let flags = "W"
endif
let cl = line(".")
let cc = col(".")
let tmp = search(a:pattern, flags)
while tmp && synIDattr(synID(line("."), col("."), 1), "name") =~
\ 'm[fp]\(Comment\|TeXinsert\|String\)'
let tmp = search(a:pattern, flags)
endwhile
if !tmp
call cursor(cl,cc)
endif
return tmp
endfunction
" }}}
function! GetMetaPostIndent()
" not indent in comment ???
if synIDattr(synID(line("."), col("."), 1), "name") =~
\ 'm[fp]\(Comment\|TeXinsert\|String\)'
return -1
endif
" Some RegExps: {{{1
" end_of_item: all of end by ';'
" + all of end by :endfor, :enddef, :endfig, :endgroup, :fi
" + all of start by :beginfig(num), :begingroup
" + all of start by :for, :if, :else, :elseif and end by ':'
" + all of start by :def, :vardef and end by '='
let end_of_item = '\(' .
\ ';\|' .
\ '\<\(end\(for\|def\|fig\|group\)\|fi\)\>\|' .
\ '\<begin\(group\>\|fig\s*(\s*\d\+\s*)\)\|' .
\ '\<\(for\|if\|else\(if\)\=\)\>.\+:\|' .
\ '\<\(var\)\=def\>.\+=' . '\)'
" }}}
" Save: current position {{{1
let cl = line (".")
let cc = col (".")
let cs = getline(".")
" if it is :beginfig or :endfig use zero indent
if cs =~ '^\s*\(begin\|end\)fig\>'
return 0
endif
" }}}
" Initialise: ind variable {{{1
" search previous item not in current line
let p_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
while p_semicol_l == cl
let p_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
endwhile
" if this is first item in program use zero indent
if !p_semicol_l
return 0
endif
" if this is multiline item, remember first indent
if MetaNextNonblankNoncomment(p_semicol_l+1) < cl
let ind = indent(MetaNextNonblankNoncomment(p_semicol_l+1))
" else --- search pre-previous item for search first line in previous item
else
" search pre-previous item not in current line
let pp_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
while pp_semicol_l == p_semicol_l
let pp_semicol_l = MetaSearchNoncomment(end_of_item,"bW")
endwhile
" if we find pre-previous item, remember indent of previous item
" else --- remember zero
if pp_semicol_l
let ind = indent(MetaNextNonblankNoncomment(line(".")+1))
else
let ind = 0
endif
endif
" }}}
" Increase Indent: {{{1
" if it is an internal/external :for or :if statements {{{2
let pnn_s = getline(MetaPrevNonblankNoncomment(cl-1))
if pnn_s =~ '\<\(for\|if\)\>.\+:\s*\($\|%\)'
let ind = match(pnn_s, '\<\(for\|if\)\>.\+:\s*\($\|%\)') + &sw
" }}}
" if it is a :def, :vardef, :beginfig, :begingroup, :else, :elseif {{{2
elseif pnn_s =~ '^\s*\(' .
\ '\(var\)\=def\|' .
\ 'begin\(group\|fig\s*(\s*\d\+\s*)\)\|' .
\ 'else\(if\)\=' . '\)\>'
let ind = ind + &sw
" }}}
" if it is a broken line {{{2
elseif pnn_s !~ end_of_item.'\s*\($\|%\)'
let ind = ind + (2 * &sw)
endif
" }}}
" }}}
" Decrease Indent: {{{1
" if this is :endfor or :enddef statements {{{2
" this is correct because :def cannot be inside :for
if cs =~ '\<end\(for\|def\)\=\>'
call MetaSearchNoncomment('\<for\>.\+:\s*\($\|%\)' . '\|' .
\ '^\s*\(var\)\=def\>',"bW")
if col(".") > 1
let ind = col(".") - 1
else
let ind = indent(".")
endif
" }}}
" if this is :fi, :else, :elseif statements {{{2
elseif cs =~ '\<\(else\(if\)\=\|fi\)\>'
call MetaSearchNoncomment('\<if\>.\+:\s*\($\|%\)',"bW")
let ind = col(".") - 1
" }}}
" if this is :endgroup statement {{{2
elseif cs =~ '^\s*endgroup\>'
let ind = ind - &sw
endif
" }}}
" }}}
return ind
endfunction
"
let &cpo = s:keepcpo
unlet s:keepcpo
" vim:sw=2:fdm=marker
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