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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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14864
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5 " Last change by: Takuya Fujiwara, 2018 Sep 23
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7
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6
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7 " TODO:
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8 " checking with respect to syntax highlighting
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9 " ignoring multiline comments
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10 " detecting multiline strings
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11
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12 " Only load this indent file when no other was loaded.
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13 if exists("b:did_indent")
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14 finish
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15 endif
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16
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17 let b:did_indent = 1
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18
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19 setlocal indentexpr=GetPrologIndent()
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20 setlocal indentkeys-=:,0#
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21 setlocal indentkeys+=0%,-,0;,>,0)
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22
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23 " Only define the function once.
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24 "if exists("*GetPrologIndent")
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25 " finish
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26 "endif
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27
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28 function! GetPrologIndent()
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29 " Find a non-blank line above the current line.
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30 let pnum = prevnonblank(v:lnum - 1)
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31 " Hit the start of the file, use zero indent.
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32 if pnum == 0
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33 return 0
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34 endif
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35 let line = getline(v:lnum)
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36 let pline = getline(pnum)
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37
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38 let ind = indent(pnum)
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39 " Previous line was comment -> use previous line's indent
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40 if pline =~ '^\s*%'
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14864
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41 return ind
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42 endif
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43 " Previous line was the start of block comment -> +1 after '/*' comment
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44 if pline =~ '^\s*/\*'
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45 return ind + 1
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46 endif
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47 " Previous line was the end of block comment -> -1 after '*/' comment
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48 if pline =~ '^\s*\*/'
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49 return ind - 1
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7
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50 endif
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51 " Check for clause head on previous line
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14864
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52 if pline =~ '\%(:-\|-->\)\s*\(%.*\)\?$'
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11518
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53 let ind = ind + shiftwidth()
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7
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54 " Check for end of clause on previous line
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55 elseif pline =~ '\.\s*\(%.*\)\?$'
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11518
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56 let ind = ind - shiftwidth()
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7
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57 endif
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58 " Check for opening conditional on previous line
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59 if pline =~ '^\s*\([(;]\|->\)'
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11518
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60 let ind = ind + shiftwidth()
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7
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61 endif
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62 " Check for closing an unclosed paren, or middle ; or ->
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63 if line =~ '^\s*\([);]\|->\)'
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11518
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64 let ind = ind - shiftwidth()
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7
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65 endif
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66 return ind
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67 endfunction
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