; cmake-mode.el = Emacs major mode for editing CMake listfiles.
; Bill Hoffman and Brad King

; Add cmake listfile names to the mode list.
(setq auto-mode-alist
	  (append
	   '(("CMakeLists\\.txt\\'" . cmake-mode))
	   '(("\\.cmake\\'" . cmake-mode))
	   auto-mode-alist))

; Default indentation increment.
(defvar cmake-tab-width 2)

; Regular expressions used by line indentation function.
(defconst cmake-indent-blank-regex "^[ \t]*$")
(defconst cmake-indent-open-regex "^[^()\n]*([^()\n]*\\(#[^\n]*\\)?\n")
(defconst cmake-indent-close-regex "^[^()\n]*)[ \t]*\\(#[^\n]*\\)?\n")
(defconst cmake-indent-begin-regex "^[ \t]*\\(IF\\|MACRO\\|FOREACH\\|ELSE\\)")
(defconst cmake-indent-end-regex "^[ \t]*\\(ENDIF\\|ENDFOREACH\\|ENDMACRO\\|ELSE\\)")

; Line indentation function.
(defun cmake-indent ()
  "Indent current line as CMAKE code."
  (interactive)  
  (beginning-of-line)
  (if (bobp)
      (indent-line-to 0)
    (let (cur-indent)
      
      ; Search back for previous non-blank line.
      (save-excursion
        (forward-line -1)
        (while (and (not (bobp)) (looking-at cmake-indent-blank-regex))
          (forward-line -1)
          )
        ; Start with previous non-blank line's indentation.
        (setq cur-indent (current-indentation))
        
        ; If previous line begins a block, we indent this line.
        (if (looking-at cmake-indent-begin-regex)
            (setq cur-indent (+ cur-indent cmake-tab-width))
          )

        ; If previous line opens a command invocation, we indent this line.
        (if (looking-at cmake-indent-open-regex)
            (setq cur-indent (+ cur-indent cmake-tab-width))
          )

        ; If previous line closes a command invocation, we unindent
        ; this line.
        (if (looking-at cmake-indent-close-regex)
            (setq cur-indent (- cur-indent cmake-tab-width))
          )
        (if (looking-at "^[ \t]*#[^\n]*")
            (setq cur-indent (current-indentation))
          )
        )
      
      ; If this line ends a block, we unindent it.
      (if (looking-at cmake-indent-end-regex)
          (setq cur-indent (- cur-indent cmake-tab-width))
        )
      
      ; Indent this line by the amount selected.
      (if (< cur-indent 0)
          (indent-line-to 0)
        (indent-line-to cur-indent)
        )
      )
    )
  )
; (regexp-opt '("ABSTRACT_FILES" "ADD_CUSTOM_COMMAND" "ADD_CUSTOM_TARGET" "ADD_DEFINITIONS" "ADD_DEPENDENCIES" "ADD_EXECUTABLE" "ADD_LIBRARY" "ADD_TEST" "AUX_SOURCE_DIRECTORY" "BUILD_COMMAND" "BUILD_NAME" "CMAKE_MINIMUM_REQUIRED" "CONFIGURE_FILE" "CREATE_TEST_SOURCELIST" "CREATE_TEST_SOURCELIST " "ELSE" "ENABLE_TESTING" "ENABLE_TESTING " "ENDFOREACH" "ENDIF" "EXEC_PROGRAM" "EXPORT_LIBRARY_DEPENDENCIES" "FIND_FILE" "FIND_LIBRARY" "FIND_PACKAGE" "FIND_PATH" "FIND_PROGRAM" "FLTK_WRAP_UI" "FOREACH" "GET_CMAKE_PROPERTY" "GET_FILENAME_COMPONENT" "GET_SOURCE_FILE_PROPERTY" "GET_TARGET_PROPERTY" "IF" "INCLUDE" "INCLUDE_DIRECTORIES" "INCLUDE_EXTERNAL_MSPROJECT" "INCLUDE_REGULAR_EXPRESSION" "INSTALL_FILES" "INSTALL_PROGRAMS" "INSTALL_TARGETS" "ITK_WRAP_TCL" "LINK_DIRECTORIES" "LINK_LIBRARIES" "LOAD_CACHE" "LOAD_COMMAND" "MACRO" "MAKE_DIRECTORY" "MARK_AS_ADVANCED" "MESSAGE" "OPTION" "OUTPUT_REQUIRED_FILES" "PROJECT" "QT_WRAP_CPP" "QT_WRAP_UI" "REMOVE" "SEPARATE_ARGUMENTS" "SET" "SET_SOURCE_FILES_PROPERTIES" "SET_TARGET_PROPERTIES" "SITE_NAME" "SOURCE_FILES" "SOURCE_FILES_REMOVE" "SOURCE_GROUP" "STRING" "SUBDIRS" "SUBDIR_DEPENDS" "TARGET_LINK_LIBRARIES" "TRY_COMPILE" "TRY_RUN" "USE_MANGLED_MESA" "UTILITY_SOURCE" "VARIABLE_REQUIRES" "VTK_MAKE_INSTANTIATOR" "VTK_MAKE_INSTANTIATOR " "VTK_WRAP_JAVA" "VTK_WRAP_PYTHON" "VTK_WRAP_TCL" "WRAP_EXCLUDE_FILES" "WRITE_FILE" ) t)
; run the above in the scatch  buffer to generate the string that
; goes in (list '("the regexp string" . font-lock-builtin-face)

; Define keyword highlighting.
(defconst cmake-font-lock-defaults
  (list
;;   '("(" . font-lock-keyword-face)
   '("\\<\\(A\\(?:BSTRACT_FILES\\|DD_\\(?:CUSTOM_\\(?:COMMAND\\|TARGET\\)\\|DE\\(?:\\(?:FINITION\\|PENDENCIE\\)S\\)\\|EXECUTABLE\\|LIBRARY\\|TEST\\)\\|UX_SOURCE_DIRECTORY\\)\\|BUILD_\\(?:COMMAND\\|NAME\\)\\|C\\(?:MAKE_MINIMUM_REQUIRED\\|ONFIGURE_FILE\\|REATE_TEST_SOURCELIST ?\\)\\|E\\(?:LSE\\|N\\(?:ABLE_TESTING ?\\|D\\(?:FOREACH\\|IF\\|MACRO\\)\\)\\|X\\(?:EC_PROGRAM\\|PORT_LIBRARY_DEPENDENCIES\\)\\)\\|F\\(?:IND_\\(?:FILE\\|LIBRARY\\|P\\(?:A\\(?:CKAGE\\|TH\\)\\|ROGRAM\\)\\)\\|LTK_WRAP_UI\\|OREACH\\)\\|GET_\\(?:CMAKE_PROPERTY\\|FILENAME_COMPONENT\\|\\(?:SOURCE_FILE\\|TARGET\\)_PROPERTY\\)\\|I\\(?:F\\|N\\(?:CLUDE\\(?:_\\(?:DIRECTORIES\\|EXTERNAL_MSPROJECT\\|REGULAR_EXPRESSION\\)\\)?\\|STALL_\\(?:\\(?:FILE\\|PROGRAM\\|TARGET\\)S\\)\\)\\|TK_WRAP_TCL\\)\\|L\\(?:INK_\\(?:\\(?:DIRECTO\\|LIBRA\\)RIES\\)\\|OAD_C\\(?:ACHE\\|OMMAND\\)\\)\\|M\\(?:A\\(?:CRO\\|KE_DIRECTORY\\|RK_AS_ADVANCED\\)\\|ESSAGE\\)\\|O\\(?:PTION\\|UTPUT_REQUIRED_FILES\\)\\|PROJECT\\|QT_WRAP_\\(?:CPP\\|UI\\)\\|REMOVE\\|S\\(?:E\\(?:PARATE_ARGUMENTS\\|T\\(?:_\\(?:\\(?:SOURCE_FILES\\|TARGET\\)_PROPERTIES\\)\\)?\\)\\|ITE_NAME\\|OURCE_\\(?:FILES\\(?:_REMOVE\\)?\\|GROUP\\)\\|TRING\\|UBDIR\\(?:\\(?:_DEPEND\\)?S\\)\\)\\|T\\(?:ARGET_LINK_LIBRARIES\\|RY_\\(?:COMPILE\\|RUN\\)\\)\\|U\\(?:SE_MANGLED_MESA\\|TILITY_SOURCE\\)\\|V\\(?:ARIABLE_REQUIRES\\|TK_\\(?:MAKE_INSTANTIATOR ?\\|WRAP_\\(?:JAVA\\|PYTHON\\|TCL\\)\\)\\)\\|WR\\(?:AP_EXCLUDE_FILES\\|ITE_FILE\\)\\)\\>" . font-lock-builtin-face)
  "Highlighting expressions for CMAKE mode.")
  )

; Define a variable to hold the syntax table.
(defvar cmake-mode-syntax-table nil "Syntax table for cmake-mode.")

; If this mode file is reloaded, we want the syntax table to be
; regenerated when cmake-mode is called.
(setq cmake-mode-syntax-table nil)

; Let users hook to this mode.
(defvar cmake-mode-hook nil)

; Mode startup function.
(defun cmake-mode ()
  "Major mode for editing CMake listfiles."
  (interactive)
  (kill-all-local-variables)
  (setq major-mode 'cmake-mode)
  (setq mode-name "CMAKE")
  
  ; Create the syntax table if it doesn't exist.
  (if (not cmake-mode-syntax-table)
      (progn
        (setq cmake-mode-syntax-table (make-syntax-table))
        (set-syntax-table cmake-mode-syntax-table)
        
        ; Define comment syntax.
        (modify-syntax-entry ?_  "w" cmake-mode-syntax-table)
        (modify-syntax-entry ?\(  "()" cmake-mode-syntax-table)
        (modify-syntax-entry ?\)  ")(" cmake-mode-syntax-table)
        (modify-syntax-entry ?# "<" cmake-mode-syntax-table)
        (modify-syntax-entry ?\n ">" cmake-mode-syntax-table)
        )
    )
  
  ; Setup font-lock mode.
  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults '(cmake-font-lock-defaults))
  
  ; Setup indentation function.
  (make-local-variable 'indent-line-function)
  (setq indent-line-function 'cmake-indent)
  
  (run-hooks 'cmake-mode-hook))

; This file provides cmake-mode.
(provide 'cmake-mode)