Difference between revisions of "HowTo xemacsIndentation"

Revision as of 11:21, 2 July 2007

As disscussed on the message board the mighty XEmacs/Emacs-editor can be set up to automatically support the indentation-style favored by the OpenFOAM-developers.

The following two ELisp-snipplets have to be inserted into a file where your (X)Emacs will execute them at start-up (~/.emacs or similar - consult your documentation)

It has been split into two parts in order to give all users at a site

• the possibility to use this style (and maintain it in a central place)
• have to possibilty to not use this style

If you're working on a single-user machine or your admin is non-cooperative both snipplets can go to your personal initialization file.

1 Site-wide initialization

This part goes into a file that is executed for every user (your SysAdmin knows how to do that and will be glad to help you):

 
;; for OpenFOAM
(c-add-style "OpenFOAM_HGW"
	     '(
     (c-basic-offset . 4)
     (c-tab-always-indent . t)
     (indent-tabs-mode . nil)
     (c-comment-only-line-offset . (0 . 0))
     (c-indent-comments-syntactically-p . t)
     (c-block-comments-indent-p nil)
     (c-cleanup-list .
         '((defun-close-semi) (list-close-comma) (scope-operator)))
     (c-backslash-column . 48)
     (c-offsets-alist .
     (
     (c .  )                     ;; inside a multi-line C style block  comment
     (defun-open . 0)            ;; brace that opens a function definition
     (defun-close . 0)           ;; brace that closes a function definition
     (defun-block-intro .  )     ;; the first line in a top-level defun
     (class-open . 0)            ;; brace that opens a class definition
     (class-close . 0)           ;; brace that closes a class definition
     (inline-open .  )           ;; brace that opens an in-class inline method
     (inline-close . 0)          ;; brace that closes an in-class inline method
     (topmost-intro . 0)         ;; the first line in a topmost construct
                                 ;; definition
     (topmost-intro-cont . 0)    ;; topmost definition continuation lines
     (member-init-intro .  )     ;; first line in a member initialization list
     (member-init-cont . 0)      ;; subsequent member initialization list lines
     (inher-intro . 0)           ;; first line of a multiple inheritance list
     (inher-cont .  )            ;; subsequent multiple inheritance lines
     (block-open . 0)            ;; statement block open brace
     (block-close . 0)           ;; statement block close brace
     (brace-list-open . 0)       ;; open brace of an enum or static array list
     (brace-list-close . 0)      ;; open brace of an enum or static array list
     (brace-list-intro .  )      ;; first line in an enum or static array list
     (brace-list-entry . 0)      ;; subsequent lines in an enum or static array
                                 ;; list
     (statement . 0)             ;; a C/C  /ObjC statement
     (statement-cont .  )        ;; a continuation of a C/C  /ObjC statement
     (statement-block-intro .  ) ;; the first line in a new statement block
     (statement-case-intro .  )  ;; the first line in a case `block'
     (statement-case-open .  )   ;; the first line in a case `block'
                                 ;; starting with brace
     (substatement .  )          ;; the first line after an if/while/for/do/else
     (substatement-open . 0)     ;; the brace that opens a substatement block
     (case-label .  )            ;; a case or default label
     (access-label . -)          ;; C   private/protected/public access label
     (label . -)                 ;; any non-special C/C  /ObjC label
     (do-while-closure . 0)      ;; the `while' that ends a do/while construct
     (else-clause . 0)           ;; the `else' of an if/else construct
     (comment-intro . 0)         ;; line containing only a comment introduction
     (arglist-intro .  )         ;; the first line in an argument list
     (arglist-cont . 0)          ;; subsequent argument list lines when no
                                 ;; subsequent argument list lines
                                 ;; when no the
                                 ;; arglist opening paren
     (arglist-cont-nonempty . 0) ;; subsequent argument list lines when at
                                 ;; subsequent argument list lines
                                 ;; when at line
                                 ;; as the arglist opening paren
     (arglist-close . 0)         ;; line as the arglist opening paren
     (stream-op .  )             ;; lines continuing a stream operator construct
     (inclass .  )               ;; the construct is nested inside a class
                                 ;; definition
     (cpp-macro .  )             ;; the construct is nested inside a class
                                 ;; definition
     (friend . 0)                ;; a C   friend declaration
     )
     )
     )
)
 
(defun openfoam-hgw-c-mode-hook ()
  (c-set-style "OpenFOAM_HGW")
  )

2 Per-user initialization

Users that want to use that style as a default only have to add this line to their initialization-file (of course this can be done for the whole site if you don't want to give people the choice):

 
(add-hook 'c-mode-common-hook 'openfoam-hgw-c-mode-hook)

3 Manual activation

If the style is not activated for a user automatically it can be activated by calling the c-set-style-function in Emacs and selecting it.