Damon.Lipparelli@CS.CMU.EDU (04/09/90)
Hello. I'm having trouble with the text-mode-hook feature. I'd like to set things so that when I enter text mode, I'm automatically put into auto-fill mode as well. I tried setting the variable text-mode-hook to be auto-fill-mode (ie, "(setq text-mode-hook 'auto-fill-mode)"), but I get the error "Wrong number of arguments" and then a lambda expression. I assume that this means that auto-fill-mode is expecting arguments (as documented it can take one), but I can just type auto-fill-mode to the mode-line and it toggles auto-fill. What am I missing? Thanks in advance, Damon Lipparelli (lipp@cs.cmu.edu)
hopkins@gmuvax2.gmu.edu (Matt hopkins) (04/09/90)
In article <sa7sr8K00hMN1MQG0R@cs.cmu.edu> Damon.Lipparelli@CS.CMU.EDU writes: >Hello. I'm having trouble with the text-mode-hook feature. I'd like to >set things so that when I enter text mode, I'm automatically put into >auto-fill mode as well. I tried setting the variable text-mode-hook to >be auto-fill-mode (ie, "(setq text-mode-hook 'auto-fill-mode)"), but I >Damon Lipparelli >(lipp@cs.cmu.edu) Well, the way I do it is to (setq text-mode-hook 'turn-on-auto-fill) And then a M-X text-mode so emacs will use it. Hope this works. Matt -- "Do you hate people?" "No ... but I seem to feel Matt Hopkins better when they're not around." - Barfly George Mason University "Six double five three two one." - A Clockwork Orange Fairfax, Virginia hopkins@gmuvax2.gmu.edu
jr@bbn.com (John Robinson) (04/10/90)
In article <sa7sr8K00hMN1MQG0R@cs.cmu.edu>, Damon.Lipparelli@CS writes: >Hello. I'm having trouble with the text-mode-hook feature. I'd like to >set things so that when I enter text mode, I'm automatically put into >auto-fill mode as well. I tried setting the variable text-mode-hook to >be auto-fill-mode (ie, "(setq text-mode-hook 'auto-fill-mode)"), but I >get the error "Wrong number of arguments" and then a lambda expression. >I assume that this means that auto-fill-mode is expecting arguments (as >documented it can take one), but I can just type auto-fill-mode to the >mode-line and it toggles auto-fill. What am I missing? Functions called interactively (i.e. with M-x, or by being bound to a key you type) can take their arguments in a number of ways, and may default them. All this is explained in the documentation for the "function" called interactive. When they're called from a program, however, the lisp interpreter has to match arguments and formals. The sepecification for the function auto-fill-mode is: (interactive "P") which means "pick up the prefix argument, if any, in raw form". When there is no prefix argument, the argument to auto-fill-mode defaults to nil. One could plausibly argue that the argument to auto-fill-mode ought to be &optional, but it ain't. Fortunately, emacs provides you with [in simple.el]: (defun turn-on-auto-fill () "Unconditionally turn on Auto Fill mode." (auto-fill-mode 1)) which serves just fine for your text-mode-hook (and whatever else). -- /jr, nee John Robinson Life did not take over the globe by combat, jr@bbn.com or bbn!jr but by networking -- Lynn Margulis
pd@ixi.uucp (Paul Davey) (04/10/90)
In article <sa7sr8K00hMN1MQG0R@cs.cmu.edu> Damon.Lipparelli@CS.CMU.EDU writes:
Hello. I'm having trouble with the text-mode-hook feature. I'd like to
set things so that when I enter text mode, I'm automatically put into
auto-fill mode as well. I tried setting the variable text-mode-hook to
be auto-fill-mode (ie, "(setq text-mode-hook 'auto-fill-mode)"), but I
get the error "Wrong number of arguments" and then a lambda expression.
I assume that this means that auto-fill-mode is expecting arguments (as
documented it can take one), but I can just type auto-fill-mode to the
mode-line and it toggles auto-fill. What am I missing?
Thanks in advance,
Damon Lipparelli
(lipp@cs.cmu.edu)
I had some trouble working this out when I first started customising
emacs. One way is to use
(setq text-mode-hook 'turn-on-auto-fill)
but when I wanted abbrev mode in text as well I changed it to
(setq text-mode-hook '(lambda () (abbrev-mode 1) (auto-fill-mode 1)))
--
Regards, paul@ixi.uucp IXI Limited
Paul Davey ...!uunet!ixi!paul 62-74 Burleigh Street
+44 224 462 132 (fax) Cambridge U.K.
"These are interesting times" +44 223 462 131 (vox) CB1 1OJ
--
Regards, paul@ixi.uucp IXI Limited
Paul Davey ...!uunet!ixi!paul 62-74 Burleigh Street
+44 224 462 132 (fax) Cambridge U.K. jr@bbn.com (John Robinson) (04/11/90)
In article <PD.90Apr10155710@rutland.ixi.uucp>, pd@ixi (Paul Davey) writes: >but when I wanted abbrev mode in text as well I changed it to > > (setq text-mode-hook '(lambda () (abbrev-mode 1) (auto-fill-mode 1))) A hook can be a list of functions. Thus the above could be rewritten: (setq text-mode-hook '((lambda () (abbrev-mode 1)) (turn-on-auto-fill-mode))) Pretty pointless in this case, but this lets you add to an existing hook list if that's what you'd like to do: (setq text-mode-hook (cons text-mode-hook '(turn-on-auto-fill))) ... (setq text-mode-hook (cons text-mode-hook '((lambda () (abbrev-mode 1))))) See the definition of run-hooks. -- /jr, nee John Robinson Life did not take over the globe by combat, jr@bbn.com or bbn!jr but by networking -- Lynn Margulis
weiner@novavax.UUCP (Bob &) (04/12/90)
pd@ixi.uucp (Paul Davey) writes: > > In article <sa7sr8K00hMN1MQG0R@cs.cmu.edu> Damon.Lipparelli@CS.CMU.EDU writes: > Hello. I'm having trouble with the text-mode-hook feature. I'd like to > set things so that when I enter text mode, I'm automatically put into > auto-fill mode as well. I tried setting the variable text-mode-hook to > be auto-fill-mode (ie, "(setq text-mode-hook 'auto-fill-mode)"), but I > get the error "Wrong number of arguments" and then a lambda expression. > > I had some trouble working this out when I first started customising > emacs. One way is to use > > (setq text-mode-hook 'turn-on-auto-fill) > > but when I wanted abbrev mode in text as well I changed it to > > (setq text-mode-hook '(lambda () (abbrev-mode 1) (auto-fill-mode 1))) > A better solution to the above problem is one we have used on a heavily site customized version of GNU Emacs for two years. Emacs init files seldom have any knowledge of whether another init file has already set a hook variable to some value and they typically don't want to test for this either. Overwriting such a variable is a bad idea since one typically wants to add functionality to the hook, not replace it. The best tactic is then to simply append to the value of a hook variable when you want to change its behavior in an init file. Here is the needed Elisp: ;; Bob Weiner, Motorola Inc., 4/14/88 ;; ;; Function used anytime a hook variable value needs to be initially set ;; or further customized. ;; (defun append-to-var (var-symbol-name list-to-add) "If VAR-SYMBOL-NAME is bound, append LIST-TO-ADD (a list) to value of variable (a list) given by var-symbol-name. If unbound, variable is set to list-to-add. Often used to append to 'hook' variables." (set-variable var-symbol-name (append (and (boundp var-symbol-name) (symbol-value var-symbol-name)) list-to-add))) ;; ;; Examples ;; ;; Default to Auto-fill when in text mode (append-to-var 'text-mode-hook '(turn-on-auto-fill)) ;; Add personal behavior to rmail hook (append-to-var 'rmail-mode-hook '(rmail-personal-init)) (defun rmail-personal-init () "Function to run when rmail-mode is invoked." <body>) -- Bob Weiner, Motorola, Inc., Usenet: ...!gatech!uflorida!novavax!weiner Internet: novavax!weiner@uunet.uu.net (407) 364-2087
jr@bbn.com (John Robinson) (04/12/90)
In article <54725@bbn.COM>, jr@bbn (John Robinson) writes: >A hook can be a list of functions. ... > > (setq text-mode-hook '((lambda () (abbrev-mode 1)) (turn-on-auto-fill-mode))) Well, that had two problems [assuming 18,55, if it matters]: 1. turn-on-auto-fill-mode doesn't exist; it is really turn-on-auto-fill. 2. The members of the list are symbols, not lists of symbols [a list is okay only when it is a lambda-expression]. So the correct form should be (and I *did* try this one): (setq text-mode-hook '((lambda () (abbrev-mode 1)) turn-on-auto-fill)) > (setq text-mode-hook (cons text-mode-hook '(turn-on-auto-fill))) >... > (setq text-mode-hook (cons text-mode-hook '((lambda () (abbrev-mode 1))))) These fail if text-mode-hook is undefined. See Bob Weiner's separate followup for a nicer solution. -- /jr, nee John Robinson Life did not take over the globe by combat, jr@bbn.com or bbn!jr but by networking -- Lynn Margulis