Am Dienstag, den 25.05.2021, 16:40 +0300 schrieb Andrew Tropin:
> ---
> Thank you for the patches, tested, works for me! The solution is
> much more precise than mutating package-directory-list variable, good
> job. I don't see any major problems in the implementation (but I'm
> not very fluent elisp dev and maybe missing something).
Don't worry, I can wait for a proper review by some of our experts,
since we shouldn't mess with emacs-build-system all too often anyway :P
> I drafted a simple build phase, which generates -pkg.el in case it is
> missing.
>
> There are at least a few problems with this implementation:
>
> 1. There is no information about package record available during
> build, which makes it hard to get package name and package
> version. I can't use any regexp to obtain this information from name
> or elpa-name-ver, because package name and version can have
> arbitrary form: comment-dwim-2-1.0, cyberpunk-2019-theme-20191008-
> alpha or something like that.
> 2. It's also not so easy to extract description of the package from
> somewhere, the first option is to pass package record to build phases
> somehow, another is to parse PACKAGE-NAME.el file comments section.
> 3. This one I consider as a minor flaw: there is no generic solution
> for packages built with build systems other than emacs-build-system.
3. is easy -- just have those packages call the phase through emacs-
build-system. There already exist packages which do that, and it
should be pretty straightforward to do.
For 1. and 2. I think you're thinking a little too complicated. We can
call Emacs at build time. In particular, we can use all of the lisp-
mnt stuff, that I used in emacs-dpd at build time, we just need to
write the (define-package ...) form to disk.
In order to pick the right file, we can either use package-name (see
discussion below) or the name of the pkg-file without -pkg. Come to
think about it, we might also provide #:pkg-file-name as a keyword and
only generate the package file if it's set to a value other than #f,
i.e. let the packager choose whether they want to generate a -pkg.el
file. Something along this line is done with the build.xml of ant-
build-system.
> So, this patch is very dirty and I publish it only for future
> reference.
>
> The intuition says that we should split name and version in build
> phase arguments, also it seems that it will be useful to provide
> other information about package during build time for cases like this
> one. I'll learn this area a bit more and probably will make another
> thread someday.
IIRC, there's a demand for having package-name and package-version
available during build (which might get through next core-updates or
might not -- we'll see), but I don't think we can argue for
description, especially when the Guix description might not be the
thing package.el wants here.
> guix/build/emacs-build-system.scm | 60
> ++-
> 1 file changed, 59 insertions(+), 1 deletion(-)
>
> diff --git a/guix/build/emacs-build-system.scm
> b/guix/build/emacs-build-system.scm
> index f13162d6c4..2bb102b4be 100644
> --- a/guix/build/emacs-build-system.scm
> +++ b/guix/build/emacs-build-system.scm
> @@ -116,6 +116,63 @@ environment variable\n" source-directory))
> (parameterize ((%emacs emacs))
>(emacs-byte-compile-directory (elpa-directory out)
>
> +
> +(define* (add-pkg-file-if-missing #:key name outputs #:allow-other-
> keys
> + #:rest args)
> + "Generate simple -pkg.el in case package doesn't have it in source
> code."
> + (define (file-contains-nul-char? file)
> +(call-with-input-file file
> + (lambda (in)
> +(let loop ((line (read-line in 'concat)))
> + (cond
> + ((eof-object? line) #f)
> + ((string-index line #\nul) #t)
> + (else (loop (read-line in 'concat))
> + #:binary #t))
> +
> + (let* ((out (assoc-ref outputs "out"))
> + (el-dir (elpa-directory out))
> + (elpa-name-ver (store-directory->elpa-name-version out))
> + (el-files (remove file-contains-nul-char?
> + (find-files (getcwd) "\\.el$")))
> + (el-names (map (lambda (x) (basename x ".el")) el-files))
> +
> + (possible-names
> + (fold (lambda (x acc)
> + (cons
> + (string-append
> +(if (not (null? acc)) (string-append (first acc)
> "-") "")
> +x)
> + acc))
> +'()
> +(string-split elpa-name-ver #\-)))
> +
> + (package-names (append-map
> + (lambda (name)
> + (let ((m (member name el-names)))
> + (if m (list (car m)) '(
> + possible-names))
> +
> + (package-name (if (null? package-names) "" (car package-
> names)))
> + (package-version
