* XPATH queries and manipulation in guile?
@ 2017-04-23 17:10 Hartmut Goebel
2017-04-24 8:55 ` Andy Wingo
0 siblings, 1 reply; 2+ messages in thread
From: Hartmut Goebel @ 2017-04-23 17:10 UTC (permalink / raw)
To: Guix-devel
Hi,
as far as I see it might be necessary to manipulate maven pom.xml files
in many cases. Fedora provides macros like "pom_xpath_inject" or
"%pom_remove_dep" for this [1, 2, 3].
Where can I find XPATH support for guile and some examples?
Alternatively we could use Fedora's python-scripts [3] to do the job –
ultimately showing that Python is superior to Java, since every Java
package needs Python to build :-)
Yes, I've seen SXPath [4], but IMHO this usign this would *not* be a
good choice: It would require packages to learn yet another path
language, while when using XPath, the packagers could simply copy
expressions from some fedora .spec-file. Additionally I find the
documentation of SXpath hard to understand - for be frank: I did not get
it at all.
[1] https://fedora-java.github.io/howto/snapshot/index.html#mvn_macros
[2] https://pagure.io/javapackages/blob/master/f/macros.d/macros.fjava
[3] https://pagure.io/javapackages/blob/master/f/java-utils
[4] https://www.gnu.org/software/guile/manual/html_node/SXPath.html
--
Regards
Hartmut Goebel
| Hartmut Goebel | h.goebel@crazy-compilers.com |
| www.crazy-compilers.com | compilers which you thought are impossible |
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: XPATH queries and manipulation in guile?
2017-04-23 17:10 XPATH queries and manipulation in guile? Hartmut Goebel
@ 2017-04-24 8:55 ` Andy Wingo
0 siblings, 0 replies; 2+ messages in thread
From: Andy Wingo @ 2017-04-24 8:55 UTC (permalink / raw)
To: Hartmut Goebel; +Cc: Guix-devel
On Sun 23 Apr 2017 19:10, Hartmut Goebel <h.goebel@crazy-compilers.com> writes:
> Yes, I've seen SXPath [4], but IMHO this usign this would *not* be a
> good choice: It would require packages to learn yet another path
> language, while when using XPath, the packagers could simply copy
> expressions from some fedora .spec-file. Additionally I find the
> documentation of SXpath hard to understand - for be frank: I did not get
> it at all.
The documentation is indeed terrible. This library is used by other
Schemes; we should see if we can steal their docs, if they are better.
However it's possible to use SXPath with the string syntax. I seem to
recall there's code out there to do that. We could incorporate into
Guile to just support the standard syntax. I think the way forward here
is to improve Guile's sxpath documentation, fixing whatever interfaces
are needed, and adding the xpath->selector function.
Andy
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