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-rw-r--r--runtime/indent/treetop.vim41
1 files changed, 41 insertions, 0 deletions
diff --git a/runtime/indent/treetop.vim b/runtime/indent/treetop.vim
new file mode 100644
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+++ b/runtime/indent/treetop.vim
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+" Vim indent file
+" Language: Treetop
+" Maintainer: Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
+" Last Change: 2022 April 25
+
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetTreetopIndent()
+setlocal indentkeys=0{,0},!^F,o,O,=end
+setlocal nosmartindent
+
+let b:undo_indent = "setl inde< indk< si<"
+
+if exists("*GetTreetopIndent")
+ finish
+endif
+
+function GetTreetopIndent()
+ let pnum = prevnonblank(v:lnum - 1)
+ if pnum == 0
+ return 0
+ endif
+
+ let ind = indent(pnum)
+ let line = getline(pnum)
+
+ if line =~ '^\s*\%(grammar\|module\|rule\)\>'
+ let ind += shiftwidth()
+ endif
+
+ let line = getline(v:lnum)
+ if line =~ '^\s*end\>'
+ let ind -= shiftwidth()
+ end
+
+ return ind
+endfunction