/usr/share/vim/vim80/indent/prolog.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | " vim: set sw=4 sts=4:
" Maintainer : Gergely Kontra <kgergely@mcl.hu>
" Revised on : 2002.02.18. 23:34:05
" Language : Prolog
" 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*%'
retu ind
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
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