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" vim: set sw=4 sts=4:
" Maintainer : Gergely Kontra <kgergely@mcl.hu>
" Revised on : 2002.02.18. 23:34:05
" Language : Prolog
" Last change by: Takuya Fujiwara, 2018 Sep 23
" TODO:
" checking with respect to syntax highlighting
" ignoring multiline comments
" detecting multiline strings
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetPrologIndent()
setlocal indentkeys-=:,0#
setlocal indentkeys+=0%,-,0;,>,0)
" Only define the function once.
"if exists("*GetPrologIndent")
" finish
"endif
function! GetPrologIndent()
" Find a non-blank line above the current line.
let pnum = prevnonblank(v:lnum - 1)
" Hit the start of the file, use zero indent.
if pnum == 0
return 0
endif
let line = getline(v:lnum)
let pline = getline(pnum)
let ind = indent(pnum)
" Previous line was comment -> use previous line's indent
if pline =~ '^\s*%'
return ind
endif
" Previous line was the start of block comment -> +1 after '/*' comment
if pline =~ '^\s*/\*'
return ind + 1
endif
" Previous line was the end of block comment -> -1 after '*/' comment
if pline =~ '^\s*\*/'
return ind - 1
endif
" Check for clause head on previous line
if pline =~ '\%(:-\|-->\)\s*\(%.*\)\?$'
let ind = ind + shiftwidth()
" Check for end of clause on previous line
elseif pline =~ '\.\s*\(%.*\)\?$'
let ind = ind - shiftwidth()
endif
" Check for opening conditional on previous line
if pline =~ '^\s*\([(;]\|->\)'
let ind = ind + shiftwidth()
endif
" Check for closing an unclosed paren, or middle ; or ->
if line =~ '^\s*\([);]\|->\)'
let ind = ind - shiftwidth()
endif
return ind
endfunction