1 files changed, 53 insertions, 0 deletions
diff --git a/runtime/indent/chaiscript.vim b/runtime/indent/chaiscript.vim
new file mode 100644
index 0000000..b7a3fe5
--- /dev/null
+++ b/runtime/indent/chaiscript.vim
@@ -0,0 +1,53 @@
+" 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