freenode/#lisp - IRC Chatlog

8:56:14 srji im using emacs, sbcl, slime and i want to know if its possible to lookup the docs of in-build functions like (mapcar)?

8:59:34 srji it is :)

8:59:53 beach Sure, you can have both the Common Lisp HyperSpec and the implementation-specific documentation.

9:00:08 beach They may (should?) differ in many cases.

9:03:15 srji `(mapcar function list &rest more-lists)` im not sure what is the meaning of `&rest`?

9:03:32 beach clhs &rest

9:03:32 specbot http://www.lispworks.com/reference/HyperSpec/Body/03_da.htm

9:03:36 srji ty

9:03:41 beach ywlcm.

9:03:54 beach Sorry, yaw, I mean.

9:04:54 beach &REST means that, in addition to the required arguments FUNCTION and LIST, it can also take an arbitrary number of additional arguments.

9:05:22 srji it means it is possible to have a lambda function as argument for mapcar?

9:05:41 beach These additional arguments end up in the list MORE-LISTS. And as the name suggests, those additional arguments should be more lists.

9:06:18 phoe it's always possible to have an anonymous function as an argument to mapcar

9:06:20 beach There is no such thing as a "lambda function". The LAMBDA operator creates an anonymous function that can be used where any other function can be used.

9:06:23 phoe a function is a function

9:06:34 phoe (mapcar (lambda (x) (+ x 10)) '(1 2 3 4 5)) is a thing

9:07:15 srji seems logic

9:10:36 beach So an example of more lists would be (mapcar #'+ '(1 2 3) (4 5 6))

9:11:30 beach Er, so an example of more lists would be (mapcar #'+ '(1 2 3) '(4 5 6))

9:24:46 srji ty

9:25:10 beach yaw

10:19:32 Lord_of_Life_ ** NICK Lord_of_Life

12:51:35 kinope Hmm, how would I get the output from macroexpand-1 to be nicely formatted, w/ indentation and such. I've looked at setting *print-pretty* and *print-readably* to t, but that didn't seem to help.

12:54:58 beach It should happen automatically if you do it in the REPL.

12:55:13 Bike print-pretty T should do it. do you still get the output on one line like that?

12:55:28 Bike print-readably you probably don't want

12:55:33 Bike that's "readably" as in by the computer, not by you

13:00:35 kinope Well it's not all on one line, just is missing line-breaks where you'd expect them to be, after function arguments for instance.

13:02:04 kinope It's definitely doing some formatting, just not what I'd expect.

13:03:41 kinope previous message should read 'after function arguments(lambda list?) in a defun'

13:04:35 Bike there are some ways to adjust the formatting, but what you're seeing is probably what the implementation considers good formatting

13:04:43 Bike though i can't see it myself of course

13:07:21 kinope Yes I think you may be right, it's not a big issue, just thought I'd ask anyway.

13:45:51 terpri_ ** NICK terpri

15:22:24 Josh_2 Afternoon

15:45:36 beach Hello Josh_2.

17:18:05 dddddd__ ** NICK dddddd

17:26:25 Josh_2 How do I use a ps macro within a ps body? (parenscript)

19:25:52 TwoNotes Going crazy trying to find the right syntax to pass a c-struct by reference to a CFFI alien function (SBCL)

19:26:37 TwoNotes That is, how to describe it to define-alien-routine.

19:58:24 Josh_2 TwoNotes: that concept is alien to me ;)

19:59:01 TwoNotes Yeah, but I think it is easier to interface to existing libfoo routines that try to recreate them in Lisp

20:05:12 TwoNotes Stuff like libv4l2convert. Compute-intensive

20:18:51 Josh_2 Yep, you making bindings for v4l?

20:18:54 Josh_2 because thats kewl

20:22:23 TwoNotes I found bindings for the basic V4L2 stuff. CL-V4L2. It is specifically the format conversion linrary I need.

20:22:37 TwoNotes But later on I will also need libogg, libopus, libtheora, etc

20:23:34 TwoNotes As is usual with CL projects, I am working on something else entirely but end up spending all my time on infrastructure and these CFFI things