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1 " vim: set sw=4 sts=4:
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2 " Maintainer : Gergely Kontra <kgergely@mcl.hu>
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3 " Revised on : 2002.02.18. 23:34:05
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4 " Language : Prolog
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5
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6 " TODO:
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7 " checking with respect to syntax highlighting
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8 " ignoring multiline comments
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9 " detecting multiline strings
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10
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11 " Only load this indent file when no other was loaded.
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12 if exists("b:did_indent")
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13 finish
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14 endif
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15
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16 let b:did_indent = 1
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17
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18 setlocal indentexpr=GetPrologIndent()
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19 setlocal indentkeys-=:,0#
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20 setlocal indentkeys+=0%,-,0;,>,0)
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21
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22 " Only define the function once.
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23 "if exists("*GetPrologIndent")
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24 " finish
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25 "endif
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26
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27 function! GetPrologIndent()
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28 " Find a non-blank line above the current line.
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29 let pnum = prevnonblank(v:lnum - 1)
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30 " Hit the start of the file, use zero indent.
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31 if pnum == 0
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32 return 0
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33 endif
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34 let line = getline(v:lnum)
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35 let pline = getline(pnum)
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36
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37 let ind = indent(pnum)
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38 " Previous line was comment -> use previous line's indent
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39 if pline =~ '^\s*%'
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40 retu ind
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41 endif
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42 " Check for clause head on previous line
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43 if pline =~ ':-\s*\(%.*\)\?$'
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44 let ind = ind + &sw
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45 " Check for end of clause on previous line
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46 elseif pline =~ '\.\s*\(%.*\)\?$'
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47 let ind = ind - &sw
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48 endif
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49 " Check for opening conditional on previous line
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50 if pline =~ '^\s*\([(;]\|->\)'
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51 let ind = ind + &sw
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52 endif
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53 " Check for closing an unclosed paren, or middle ; or ->
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54 if line =~ '^\s*\([);]\|->\)'
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55 let ind = ind - &sw
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56 endif
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57 return ind
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58 endfunction
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