Introspection of system version

[Robert Goldman]

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 at riseup.net
> <mailto:fau at 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