On 6/17/16 Jun 17 -11:04 AM, Javier Olaechea wrote:

Hi Frank, You are looking for asdf:component-version. See for example how Shuffletron https://github.com/ahefner/shuffletron/blob/39c7d8af6577e9cbd39da656598f98c6eb6c3f14/src/global.lisp#L6 does it

Yes, that is because all components can have versions, not just systems.

Actually, Faré and I have in the past talked about moving the versioning from arbitrary components (including files and modules) up to systems, which is the only place I have seen it used in the wild.

As a half-measure, perhaps we should add SYSTEM-VERSION as an exported function. Having only COMPONENT-VERSION requires users of ASDF to know stuff about the inheritance structure of the COMPONENT subclasses that seems inappropriate.

Best, r

On Fri, Jun 17, 2016 at 10:59 AM, Frank <fau@riseup.net mailto:fau@riseup.net> wrote:

Hello,

In the system definition we can specify a version; for example:

(asdf:defsystem :foo
  :description "foo utility"
  :license     "LGPL"

  :version (:read-file-form "VERSION")

  :serial t
  :components ((:file "foo")))

For example I can query the system license like this:
  (asdf:system-licence (asdf:find-system "foo"))

How can I query the version of system foo at run time?

Thanks,
Frank

-- "I object to doing things that computers can do." — Olin Shivers