Re: [PATCH 2/3] gnu: Add wcslib

[John Darrington <john@darrington.wattle.id.au>]

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On Tue, Sep 13, 2016 at 11:10:57AM +0300, Alex Kost wrote:
     John Darrington (2016-09-12 17:40 +0200) wrote:
     
     > On Mon, Sep 12, 2016 at 04:44:44PM +0300, Alex Kost wrote:
     >
     >      I've noticed that you didn't fix these things (long line and #t after
     >      substitute*).  Could please do it next time :-)
     >
     >      The same for 'cfitsio' package.
     >
     > Done.
     >
     > If this is important why doesn't guix build and/or guix lint check for it?
     
     "guix lint" can't check if a phase should end with #t or not, it's up to
     you check if it is needed.  The thing is: if a phase fails, it should
     return false value, and if it succeeds, it should return non-false
     value.  A returned value of 'substitute*' is unspecified, so here you
     should add #t to the end of the phase.  It works without it, but I would
     say it happens "by chance" because #<unspecified> is considered to be
     non-false, but we shouldn't rely on it, so adding #t to such phases is
     the right thing.


1.  Presumably guix build somewhere calls something like:

   (if (run-phase x) (run-next-phase) (error))

We could change this to:

   (if (let ((result (run-phase x)))
          (if (unspecfied? result) (error "Result of phase is unspecified"))
           result)
        (run-next-phase)
	(error))

.... or something similar ...


2. It wouldn't be a bad idea to change subsitute* to return something.  For
   example, the number of substitutions performed.
     


     As for the long line, it is 89 chars long, while "guix lint" reports
     about exceeding 90 chars (see 'report-long-line' in (guix scripts lint)
     module).  BTW I think this is too loose, I would limit it to 80.
     
     But your line could be easily shorten, as I wrote at
     <http://lists.gnu.org/archive/html/guix-devel/2016-08/msg02070.html>,
     so instead of the current long line:
     
            (uri (string-append
                  "ftp://ftp.atnf.csiro.au/pub/software/wcslib/" name "-" version ".tar.bz2"))
     
     it could be:
     
            (uri (string-append
                  "ftp://ftp.atnf.csiro.au/pub/software/wcslib/"
                  name "-" version ".tar.bz2"))
     
     which fits any screen and thus is more readable I think.
     

I think all the lines are less than 80 right now aren't they?


     I just felt a bit of a letdown that you ignored my comments and
     didn't send a message why.
     

I didn't mean to shun you.   I appreciate the time and effort you took to 
review my code.

Unfortunately I find the Guix workflow awkward to manage so sometimes I
have omitted corrections which ought to have been made.   Part of my
problem is that currently (due to lack of many services) I cannot send or
receive mail from the machine on which I have GuixSD running.  Hopefully
this will change soon.

J'




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