Marijn Schouten (hkBst) wrote:
Hi list,
the current interface to use flags, useq, usev, use_with, use_enable, as
defined in /usr/lib/portage/bin/ebuild.sh lacks generality. The common thing
is testing a use flag and possibly echoing a string, but there is no function
that implements this common behaviour.
I propose that we add such a function. Proposed name for the function is
"ifuse".
So these modifications are just cleanups to portage internals and would
not affect the interfaces or behaviour of use/use_with/...?
I also propose to add the utility function "ifv" which is useful for writing
concise and clean code.
These additions would allow you to easily define your own function for
processing use flags in ebuilds and eclasses. One such example is
use_mime() {
local WORD=$(ifv "$2" "$2" "$1")
ifuse "$1" "${WORD};"
}
for generating a string of ';'-separated mime-types based on use flags.
The explanation of this function is:
#set WORD to argument 2 or if that is empty to argument 1
#output "${WORD};" if use flag $1 is set (or if it starts with ! and is unset)
#otherwise don't output anything
I don't quite understand what this function does. What ebuild nastiness
does it replace, or what does it allow that was not previously possible?
(can you give an example?)
Thanks,
Daniel
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