[gentoo-dev] Re: I want to steal your tools

[Ryan Hill <dirtyepic@gentoo.org>]

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Thomas de Grenier de Latour wrote:
> On 2008/02/04, Ryan Hill <dirtyepic@gentoo.org> wrote:
>> Can someone provide a tool that given a package name simply prints
>> the category or cat/pkg, or if ambiguous, prints the multiple
>> cat/pkgs or returns an error code?  I don't care what it's written in
>> as long as it's relatively quick.
> 
> As long as you're only interrested in stuffs from the Portage tree,
> and not overlays, and you have portage-utils installed along with its
> post-sync hook, you can use one of this function:
> 
> find_cat1() {
>    qsearch -CsN "^${1}$"
> }
> 
> find_cat2() {
>    sed -n "\\|/${1}/|s:/[^/]*\$::p" "${PORTDIR}"/.ebuild.x \
>       | uniq
> }
> 
> Note that find_cat1() is case-insensitive, probably not what you want.
> 
> And without portage-utils' ebuilds cache, this works too:
> 
> find_cat3() {
>    pushd "${PORTDIR}" >/dev/null
>    ls -1d $(sed "s:\$:/${1}:" profiles/categories) 2>/dev/null
>    popd >/dev/null
> }
> 
> Here are some benchs (real time, with 1 run from cold I/O cache, and
> then 100 runs also from cold I/O cache, with "fuse" as argument): 
> 
>  * find_cat1:
>    - 0m0.972s
>    - 0m25.967s
> (No real advantage... that's not the primary target of this applet.)
> 
>  * find_cat2:
>    - 0m0.237s
>    - 0m3.746s
> (Acceptable in both cases.)
> 
>  * find_cat3:
>    - 0m2.319s
>    - 0m2.607s
> (Really slow on first run, but really fast once the tree as been
> walked.  May be a good choice in some contexts.)

Perfect!  I'll tinker with these and see what I come up with.

Thanks.


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