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7
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1 " vim: set sw=4 sts=4:
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25880
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2 " Language: Prolog
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3 " Maintainer: Gergely Kontra <kgergely@mcl.hu> (Invalid email address)
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4 " Doug Kearns <dougkearns@gmail.com>
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5 " Revised on: 2002.02.18. 23:34:05
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14864
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6 " Last change by: Takuya Fujiwara, 2018 Sep 23
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7
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7
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8 " TODO:
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9 " checking with respect to syntax highlighting
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10 " ignoring multiline comments
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11 " detecting multiline strings
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12
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13 " Only load this indent file when no other was loaded.
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14 if exists("b:did_indent")
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15 finish
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16 endif
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17
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18 let b:did_indent = 1
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19
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20 setlocal indentexpr=GetPrologIndent()
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21 setlocal indentkeys-=:,0#
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22 setlocal indentkeys+=0%,-,0;,>,0)
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23
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24 " Only define the function once.
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25 "if exists("*GetPrologIndent")
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26 " finish
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27 "endif
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28
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29 function! GetPrologIndent()
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30 " Find a non-blank line above the current line.
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31 let pnum = prevnonblank(v:lnum - 1)
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32 " Hit the start of the file, use zero indent.
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33 if pnum == 0
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34 return 0
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35 endif
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36 let line = getline(v:lnum)
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37 let pline = getline(pnum)
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38
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39 let ind = indent(pnum)
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40 " Previous line was comment -> use previous line's indent
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41 if pline =~ '^\s*%'
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14864
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42 return ind
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43 endif
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44 " Previous line was the start of block comment -> +1 after '/*' comment
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45 if pline =~ '^\s*/\*'
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46 return ind + 1
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47 endif
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48 " Previous line was the end of block comment -> -1 after '*/' comment
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49 if pline =~ '^\s*\*/'
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50 return ind - 1
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7
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51 endif
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52 " Check for clause head on previous line
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14864
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53 if pline =~ '\%(:-\|-->\)\s*\(%.*\)\?$'
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11518
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54 let ind = ind + shiftwidth()
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7
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55 " Check for end of clause on previous line
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56 elseif pline =~ '\.\s*\(%.*\)\?$'
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11518
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57 let ind = ind - shiftwidth()
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7
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58 endif
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59 " Check for opening conditional on previous line
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60 if pline =~ '^\s*\([(;]\|->\)'
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11518
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61 let ind = ind + shiftwidth()
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7
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62 endif
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63 " Check for closing an unclosed paren, or middle ; or ->
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64 if line =~ '^\s*\([);]\|->\)'
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11518
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65 let ind = ind - shiftwidth()
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7
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66 endif
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67 return ind
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68 endfunction
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