bug#71817: 29.3; Sub-directory handling of ELPA package

[Xiyue Deng <manphiz@gmail.com>]

Hi,

I'm opening a bug to continue the discussion from the emacs-devel
mailing list thread[1].

TL;DR I would like to understand how upstream would like to handle
sub-directories with ELisp source files as to whether to add them to
`load-path' recursively or not to determine the path forward for source
code organization.

Currently as observed, ELPA packages only get their root path added to
`load-path', but source code in sub-directories will still get
byte-compiled.  That is, for an ELPA package elpafoo with a nested
sub-directory of the following structure (installed through package.el):

,----
| ~/.config/emacs/elpa/elpafoo/
| ~/.config/emacs/elpa/elpafoo/elpafoo.el
| ~/.config/emacs/elpa/elpafoo/elpabar
| ~/.config/emacs/elpa/elpafoo/elpabar/elpabar.el
`----

only `~/.config/emacs/elpa/elpafoo' is added to `load-path', while both
elpafoo.el and elpabar.el will get byte-compiled.  Currently I don't
seem to find where this behavior is documented, so do give me a pointer
if it exists.

If this is not yet a policy, I wonder whether this will be the path
forward for `load-path' handling.  I see some pros of adding
sub-directories recursively, such as better source code organization so
that not all source code files need to reside in the root directory.
However, the downside is also obvious, such as unnecessary loading of
test sources as Michael pointed out in [2], or loading vendored code
that could cause conflicts (as I observed in the case of auctex), etc.

So, what would be the upstream or package.el maintainers' opinions on
how this should be handled?

Thanks in advance.

[1] https://lists.gnu.org/archive/html/emacs-devel/2024-05/msg00658.html
[2] https://lists.gnu.org/archive/html/emacs-devel/2024-05/msg01039.html


In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38,
 cairo version 1.16.0) of 2024-05-20, modified by Debian built on sbuild
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --with-cairo --with-x=yes
 --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -ffile-prefix-map=/build/reproducible-path/emacs-29.3+1=. -fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
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XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
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Major mode: Lisp Interaction

Minor modes in effect:
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  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/usr/share/emacs/site-lisp/elpa/debian-el-37.13/debian-autoloads hides /usr/share/emacs/site-lisp/elpa/gnuplot-0.8.1/debian-autoloads
/usr/share/emacs/site-lisp/elpa/magit-3.3.0/magit-section hides /usr/share/emacs/site-lisp/elpa/magit-section-3.3.0/magit-section

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Memory information:
((conses 16 1552547 193601)
 (symbols 48 45285 63)
 (strings 32 201941 25320)
 (string-bytes 1 6355104)
 (vectors 16 124914)
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 (buffers 984 122))

-- 
Xiyue Deng