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vim9script
# Language: ConTeXt typesetting engine
# Maintainer: Nicola Vitacolonna <nvitacolonna@gmail.com>
# Former Maintainers: Nikolai Weibull <now@bitwi.se>
# Latest Revision: 2023 Dec 26
if exists("b:did_indent")
finish
endif
# Load MetaPost indentation script (this will also set b:did_indent)
runtime! indent/mp.vim
setlocal indentexpr=ConTeXtIndent()
b:undo_indent = "setl indentexpr<"
def PrevNotComment(l: number): number
var prevlnum = prevnonblank(l)
while prevlnum > 0 && getline(prevlnum) =~# '^\s*%'
prevlnum = prevnonblank(prevlnum - 1)
endwhile
return prevlnum
enddef
def FindPair(pstart: string, pmid: string, pend: string): number
cursor(v:lnum, 1)
return indent(searchpair(pstart, pmid, pend, 'bWn',
'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
enddef
def ConTeXtIndent(): number
# Use MetaPost rules inside MetaPost graphic environments
if len(synstack(v:lnum, 1)) > 0 &&
synIDattr(synstack(v:lnum, 1)[0], "name") ==# 'contextMPGraphic'
return g:MetaPostIndent()
endif
const prevlnum = PrevNotComment(v:lnum - 1)
const prevind = indent(prevlnum)
const prevline = getline(prevlnum)
const currline = getline(v:lnum)
# If the current line starts with ], match indentation.
if currline =~# '^\s*\]'
return FindPair('\[', '', '\]')
endif
# If the current line starts with }, match indentation.
if currline =~# '^\s*}'
return FindPair('{', '', '}')
endif
# If the previous line ends with [ or { (possibly followed by a comment) then indent.
if prevline =~# '[{[]\s*\%(%.*\)\=$'
return prevind + shiftwidth()
endif
return -1
enddef
# vim: sw=2 fdm=marker
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