136 lines
3.8 KiB
VimL
136 lines
3.8 KiB
VimL
" LaTeX indent file (part of LaTeX Box)
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" Maintainer: David Munger (mungerd@gmail.com)
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if exists("g:LatexBox_custom_indent") && ! g:LatexBox_custom_indent
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finish
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endif
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if exists("b:did_indent")
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finish
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endif
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let b:did_indent = 1
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setlocal indentexpr=LatexBox_TexIndent()
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setlocal indentkeys=0=\\end,0=\\end{enumerate},0=\\end{itemize},0=\\end{description},0=\\right,0=\\item,0=\\),0=\\],0},o,O,0\\
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let s:list_envs = ['itemize', 'enumerate', 'description']
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" indent on \left( and on \(, but not on (
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" indent on \left[ and on \[, but not on [
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" indent on \left\{ and on {, but not on \{
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let s:open_pat = '\\\@<!\%(\\begin\|\\left\a\@!\|\\(\|\\\[\|{\)'
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let s:close_pat = '\\\@<!\%(\\end\|\\right\a\@!\|\\)\|\\\]\|}\)'
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let s:list_open_pat = '\\\@<!\\begin{\%(' . join(s:list_envs, '\|') . '\)}'
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let s:list_close_pat = '\\\@<!\\end{\%(' . join(s:list_envs, '\|') . '\)}'
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function! s:CountMatches(str, pat)
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return len(substitute(substitute(a:str, a:pat, "\n", 'g'), "[^\n]", '', 'g'))
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endfunction
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" TexIndent {{{
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function! LatexBox_TexIndent()
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let lnum_curr = v:lnum
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let lnum_prev = prevnonblank(lnum_curr - 1)
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if lnum_prev == 0
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return 0
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endif
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let line_curr = getline(lnum_curr)
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let line_prev = getline(lnum_prev)
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" remove \\
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let line_curr = substitute(line_curr, '\\\\', '', 'g')
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let line_prev = substitute(line_prev, '\\\\', '', 'g')
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" strip comments
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let line_curr = substitute(line_curr, '\\\@<!%.*$', '', 'g')
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let line_prev = substitute(line_prev, '\\\@<!%.*$', '', 'g')
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" find unmatched opening patterns on previous line
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let n = s:CountMatches(line_prev, s:open_pat)-s:CountMatches(line_prev, s:close_pat)
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let n += s:CountMatches(line_prev, s:list_open_pat)-s:CountMatches(line_prev, s:list_close_pat)
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" reduce indentation if current line starts with a closing pattern
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if line_curr =~ '^\s*\%(' . s:close_pat . '\)'
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let n -= 1
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endif
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" compensate indentation if previous line starts with a closing pattern
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if line_prev =~ '^\s*\%(' . s:close_pat . '\)'
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let n += 1
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endif
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" reduce indentation if current line starts with a closing list
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if line_curr =~ '^\s*\%(' . s:list_close_pat . '\)'
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let n -= 1
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endif
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" compensate indentation if previous line starts with a closing list
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if line_prev =~ '^\s*\%(' . s:list_close_pat . '\)'
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let n += 1
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endif
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" reduce indentation if previous line is \begin{document}
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if line_prev =~ '\\begin\s*{document}'
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let n -= 1
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endif
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" less shift for lines starting with \item
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let item_here = line_curr =~ '^\s*\\item'
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let item_above = line_prev =~ '^\s*\\item'
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if !item_here && item_above
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let n += 1
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elseif item_here && !item_above
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let n -= 1
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endif
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return indent(lnum_prev) + n * &sw
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endfunction
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" }}}
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" Restore cursor position, window position, and last search after running a
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" command.
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function! Latexbox_CallIndent()
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" Save the current cursor position.
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let cursor = getpos('.')
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" Save the current window position.
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normal! H
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let window = getpos('.')
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call setpos('.', cursor)
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" Get first non-whitespace character of current line.
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let line_start_char = matchstr(getline('.'), '\S')
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" Get initial tab position.
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let initial_tab = stridx(getline('.'), line_start_char)
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" Execute the command.
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execute 'normal! =='
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" Get tab position difference.
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let difference = stridx(getline('.'), line_start_char) - initial_tab
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" Set new cursor Y position based on calculated difference.
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let cursor[2] = cursor[2] + difference
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" Restore the previous window position.
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call setpos('.', window)
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normal! zt
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" Restore the previous cursor position.
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call setpos('.', cursor)
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endfunction
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" autocmd to call indent after completion
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" 7.3.598
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if v:version > 703 || (v:version == 703 && has('patch598'))
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augroup LatexBox_Completion
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autocmd!
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autocmd CompleteDone <buffer> call Latexbox_CallIndent()
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augroup END
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endif
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" vim:fdm=marker:ff=unix:noet:ts=4:sw=4
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