DON'T TOUCH THE KEYWORDS PACKAGE! Are you crazy?!? This will be setting a very bad precedence. Just don't. Really!
Pascal Sent from my iPad > On 18 Nov 2013, at 06:17, Faré <fah...@gmail.com> wrote: > > In ASDF 3.1.0.14, I introduced a macro :DBG (in uiop/utility.lisp). > Yes, it's in the keyword package. Why? > Because it's the one and only macro I want to be accessible from everywhere > without a prefix, yet without modifying existing defpackage forms to make > it accessible — because it's only used temporarily for debugging. > > :DBG is a macro for print-debugging. The syntax is > (:DBG tag forms... last-form) > The semantics is that if tag is true, print the tag, then for each > form, write its source and its values; return the values of the last > form. If tag is false, just evaluate the last form and return its > values. (Tag is typically a constant keyword or string, identifying > the point where values are printed.) > The expansion is rather space and time efficient, as far as the > semantics permit. > > I find :DBG soooo useful for print-debugging. I've seen tens of > variants of it, but every time with something not quite right in the > syntax, semantics or implementation. I just wanted one variant that > got everything right, and make it ubiquitous. Because when you need > it, you need it now, and there's no time to modify things to load an > additional library. And when you're done, you want minimal cleanup, > too: just delete the form, except maybe keep the last subform. > > Previously, I was using (uiop:uiop-debug) from uiop/utility which > allows you to load a magic file of your choice that defines a debug > mode. The default one I provided was mine, which define :DBG as DBG in > your current package (thereby avoiding symbol import issues). But that > still adds a new definition everytime and an extra line or form to > cleanup. > > I was recently convinced that using the keyword package instead makes > perfect sense: on the one hand, that's using a shared namespace that > it is polite to not pollute, but on the other hand, such a temporary > print-debugging macro the only use case I imagine of otherwise wanting > something to be immediately accessible without package prefixing yet > without modifying the package definition form. > > It's still time to remove that macro before the next release, but I > believe it's the right thing to include it, and maybe some of you will > agree with me and start using it, if not from the yet unrelease ASDF > 3.1.1, perhaps from a copy in your .sbclrc. > > —♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org > The common argument that crime is caused by poverty > is a kind of slander on the poor. > — H. L. Mencken >