1 files changed, 99 insertions, 0 deletions
diff --git a/runtime/indent/cmake.vim b/runtime/indent/cmake.vim
new file mode 100644
index 0000000..c1aa3bf
--- /dev/null
+++ b/runtime/indent/cmake.vim
@@ -0,0 +1,99 @@
+" Vim indent file
+" Language:     CMake (ft=cmake)
+" Author:       Andy Cedilnik <andy.cedilnik@kitware.com>
+" Maintainer:   Dimitri Merejkowsky <d.merej@gmail.com>
+" Former Maintainer: Karthik Krishnan <karthik.krishnan@kitware.com>
+" Last Change:  2023 Dec 12
+"
+" License:      The CMake license applies to this file. See
+"               https://cmake.org/licensing
+"               This implies that distribution with Vim is allowed
+
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=CMakeGetIndent(v:lnum)
+setlocal indentkeys+==ENDIF(,ENDFOREACH(,ENDMACRO(,ELSE(,ELSEIF(,ENDWHILE(
+
+let b:undo_indent = "setl inde< indk<"
+
+" Only define the function once.
+if exists("*CMakeGetIndent")
+  finish
+endif
+let s:keepcpo= &cpo
+set cpo&vim
+
+fun! CMakeGetIndent(lnum)
+  let this_line = getline(a:lnum)
+
+  " Find a non-blank line above the current line.
+  let lnum = a:lnum
+  let lnum = prevnonblank(lnum - 1)
+  let previous_line = getline(lnum)
+
+  " Hit the start of the file, use zero indent.
+  if lnum == 0
+    return 0
+  endif
+
+  let ind = indent(lnum)
+
+  let or = '\|'
+  " Regular expressions used by line indentation function.
+  let cmake_regex_comment = '#.*'
+  let cmake_regex_identifier = '[A-Za-z][A-Za-z0-9_]*'
+  let cmake_regex_quoted = '"\([^"\\]\|\\.\)*"'
+  let cmake_regex_arguments = '\(' . cmake_regex_quoted .
+                    \       or . '\$(' . cmake_regex_identifier . ')' .
+                    \       or . '[^()\\#"]' . or . '\\.' . '\)*'
+
+  let cmake_indent_comment_line = '^\s*' . cmake_regex_comment
+  let cmake_indent_blank_regex = '^\s*$'
+  let cmake_indent_open_regex = '^\s*' . cmake_regex_identifier .
+                    \           '\s*(' . cmake_regex_arguments .
+                    \           '\(' . cmake_regex_comment . '\)\?$'
+  let cmake_indent_close_regex = '^' . cmake_regex_arguments .
+                    \            ')\s*' .
+                    \            '\(' . cmake_regex_comment . '\)\?$'
+
+  let cmake_closing_parens_line = '^\s*\()\+\)\s*$'
+
+  let cmake_indent_begin_regex = '^\s*\(BLOCK\|IF\|MACRO\|FOREACH\|ELSE\|ELSEIF\|WHILE\|FUNCTION\)\s*('
+  let cmake_indent_end_regex = '^\s*\(ENDBLOCK\|ENDIF\|ENDFOREACH\|ENDMACRO\|ELSE\|ELSEIF\|ENDWHILE\|ENDFUNCTION\)\s*('
+
+  if this_line =~? cmake_closing_parens_line
+    if previous_line !~? cmake_indent_open_regex
+      let ind = ind - shiftwidth()
+    endif
+  else
+    " Add
+    if previous_line =~? cmake_indent_comment_line " Handle comments
+      let ind = ind
+    else
+      if previous_line =~? cmake_indent_begin_regex
+        let ind = ind + shiftwidth()
+      endif
+      if previous_line =~? cmake_indent_open_regex
+        let ind = ind + shiftwidth()
+      endif
+    endif
+
+    " Subtract
+    if this_line =~? cmake_indent_end_regex
+      let ind = ind - shiftwidth()
+    endif
+    if previous_line !~? cmake_closing_parens_line
+      if previous_line =~? cmake_indent_close_regex
+        let ind = ind - shiftwidth()
+      endif
+    endif
+  endif
+
+  return ind
+endfun
+
+let &cpo = s:keepcpo
+unlet s:keepcpo