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65 lines
1.8 KiB
VimL
65 lines
1.8 KiB
VimL
" Maintainer: Paulo Moura <pmoura@logtalk.org>
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" Revised on: 2018.08.04
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" Language: Logtalk
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" This Logtalk indent file is a modified version of the Prolog
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" indent file written by Gergely Kontra
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" Only load this indent file when no other was loaded.
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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=GetLogtalkIndent()
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setlocal indentkeys-=:,0#
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setlocal indentkeys+=0%,-,0;,>,0)
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" Only define the function once.
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if exists("*GetLogtalkIndent")
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finish
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endif
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function! GetLogtalkIndent()
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" Find a non-blank line above the current line.
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let pnum = prevnonblank(v:lnum - 1)
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" Hit the start of the file, use zero indent.
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if pnum == 0
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return 0
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endif
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let line = getline(v:lnum)
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let pline = getline(pnum)
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let ind = indent(pnum)
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" Previous line was comment -> use previous line's indent
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if pline =~ '^\s*%'
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retu ind
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endif
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" Check for entity opening directive on previous line
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if pline =~ '^\s*:-\s\(object\|protocol\|category\)\ze(.*,$'
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let ind = ind + shiftwidth()
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" Check for clause head on previous line
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elseif pline =~ ':-\s*\(%.*\)\?$'
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let ind = ind + shiftwidth()
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" Check for grammar rule head on previous line
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elseif pline =~ '-->\s*\(%.*\)\?$'
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let ind = ind + shiftwidth()
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" Check for entity closing directive on previous line
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elseif pline =~ '^\s*:-\send_\(object\|protocol\|category\)\.\(%.*\)\?$'
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let ind = ind - shiftwidth()
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" Check for end of clause on previous line
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elseif pline =~ '\.\s*\(%.*\)\?$'
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let ind = ind - shiftwidth()
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endif
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" Check for opening conditional on previous line
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if pline =~ '^\s*\([(;]\|->\)' && pline !~ '\.\s*\(%.*\)\?$' && pline !~ '^.*\([)][,]\s*\(%.*\)\?$\)'
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let ind = ind + shiftwidth()
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endif
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" Check for closing an unclosed paren, or middle ; or ->
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if line =~ '^\s*\([);]\|->\)'
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let ind = ind - shiftwidth()
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endif
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return ind
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endfunction
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