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Re: [Bug-apl] External tools acting on interpreter commands (nabla and )

From: Elias Mårtenson
Subject: Re: [Bug-apl] External tools acting on interpreter commands (nabla and )ED)
Date: Wed, 12 Feb 2014 17:24:52 +0800

My Emacs mode already uses the external function editor. You access it using C-c C-f. What I did was also to detect when ∇ is typed, and intercept that command to also open up the function editor that way. Thus, right now, there are two ways to open the function editor in Emacs.

The reason I did this was that the use of ∇ is probably much more well known than having to figure out that you can press C-c C-f to achieve the same effect.

The reason for my post above was to get a better way to do this hook into the ∇ command, as the method I'm using right now has some reliability issues.

That said, removal of the ∇ command altogether would, of course, remove the need for this callback mechanism.


On 12 February 2014 17:17, Nick Lobachevsky <address@hidden> wrote:
Function definition mode (typing ∇ followed by a symbol name) is an
artifact of the kind of terminal hardware supported by APL (the IBM
2741 with its iconic typeballs) in the 1960s.   As such, nearly 50
years later, it may be worth rethinking some of these things to take
advantage of newer editor and windowing technologies in common use.

In my opinion, in a windowed environment, function definition mode can
be safely disabled provided the system can provide an alternative
editor for functions and possibly variables.  In SS Windows, Dyalog
APL invokes an editor when you double click with the cursor positioned
over a name.  APL2000 invokes a full screen editor when you type ∇
followed by a name.  Function definition mode seems to be retained in
some implementations simply to be part of a faithful replica of

Removing function definition mode would have the side effect of
freeing the ∇ character for other uses.

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