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-rw-r--r--runtime/indent/chaiscript.vim53
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+" Vim indent file
+" Language: ChaiScript
+" Maintainer: Jason Turner <lefticus 'at' gmail com>
+" Last Change: 2022 Apr 06
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetChaiScriptIndent()
+setlocal autoindent
+
+let b:undo_indent = "setl ai< inde<"
+
+" Only define the function once.
+if exists("*GetChaiScriptIndent")
+ finish
+endif
+
+function! GetChaiScriptIndent()
+ " Find a non-blank line above the current line.
+ let lnum = prevnonblank(v:lnum - 1)
+
+ " Hit the start of the file, use zero indent.
+ if lnum == 0
+ return 0
+ endif
+
+ " Add a 'shiftwidth' after lines that start a block:
+ " lines containing a {
+ let ind = indent(lnum)
+ let flag = 0
+ let prevline = getline(lnum)
+ if prevline =~ '^.*{.*'
+ let ind = ind + shiftwidth()
+ let flag = 1
+ endif
+
+ " Subtract a 'shiftwidth' after lines containing a { followed by a }
+ " to keep it balanced
+ if flag == 1 && prevline =~ '.*{.*}.*'
+ let ind = ind - shiftwidth()
+ endif
+
+ " Subtract a 'shiftwidth' on lines ending with }
+ if getline(v:lnum) =~ '^\s*\%(}\)'
+ let ind = ind - shiftwidth()
+ endif
+
+ return ind
+endfunction