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Diffstat (limited to 'runtime/indent/prolog.vim')
| -rw-r--r-- | runtime/indent/prolog.vim | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/runtime/indent/prolog.vim b/runtime/indent/prolog.vim new file mode 100644 index 000000000..afe448e8f --- /dev/null +++ b/runtime/indent/prolog.vim @@ -0,0 +1,58 @@ +" 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 + &sw + " Check for end of clause on previous line + elseif pline =~ '\.\s*\(%.*\)\?$' + let ind = ind - &sw + endif + " Check for opening conditional on previous line + if pline =~ '^\s*\([(;]\|->\)' + let ind = ind + &sw + endif + " Check for closing an unclosed paren, or middle ; or -> + if line =~ '^\s*\([);]\|->\)' + let ind = ind - &sw + endif + return ind +endfunction |