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1 " Maintainer: Paulo Moura <pmoura@logtalk.org>
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2 " Revised on: 2018.08.04
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3 " Language: Logtalk
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4
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5 " This Logtalk indent file is a modified version of the Prolog
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6 " indent file written by Gergely Kontra
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7
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8 " Only load this indent file when no other was loaded.
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9 if exists("b:did_indent")
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10 finish
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11 endif
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12
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13 let b:did_indent = 1
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14
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15 setlocal indentexpr=GetLogtalkIndent()
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16 setlocal indentkeys-=:,0#
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17 setlocal indentkeys+=0%,-,0;,>,0)
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18
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19 " Only define the function once.
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20 if exists("*GetLogtalkIndent")
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21 finish
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22 endif
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23
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24 function! GetLogtalkIndent()
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25 " Find a non-blank line above the current line.
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26 let pnum = prevnonblank(v:lnum - 1)
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27 " Hit the start of the file, use zero indent.
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28 if pnum == 0
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29 return 0
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30 endif
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31 let line = getline(v:lnum)
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32 let pline = getline(pnum)
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33
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34 let ind = indent(pnum)
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35 " Previous line was comment -> use previous line's indent
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36 if pline =~ '^\s*%'
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37 retu ind
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38 endif
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39 " Check for entity opening directive on previous line
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40 if pline =~ '^\s*:-\s\(object\|protocol\|category\)\ze(.*,$'
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41 let ind = ind + shiftwidth()
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42 " Check for clause head on previous line
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43 elseif pline =~ ':-\s*\(%.*\)\?$'
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44 let ind = ind + shiftwidth()
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45 " Check for grammar rule head on previous line
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46 elseif pline =~ '-->\s*\(%.*\)\?$'
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47 let ind = ind + shiftwidth()
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48 " Check for entity closing directive on previous line
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49 elseif pline =~ '^\s*:-\send_\(object\|protocol\|category\)\.\(%.*\)\?$'
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50 let ind = ind - shiftwidth()
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51 " Check for end of clause on previous line
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52 elseif pline =~ '\.\s*\(%.*\)\?$'
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53 let ind = ind - shiftwidth()
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54 endif
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55 " Check for opening conditional on previous line
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56 if pline =~ '^\s*\([(;]\|->\)' && pline !~ '\.\s*\(%.*\)\?$' && pline !~ '^.*\([)][,]\s*\(%.*\)\?$\)'
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57 let ind = ind + shiftwidth()
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58 endif
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59 " Check for closing an unclosed paren, or middle ; or ->
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60 if line =~ '^\s*\([);]\|->\)'
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61 let ind = ind - shiftwidth()
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62 endif
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63 return ind
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64 endfunction
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