Re: [O] M-x org-version RET now produces some sensible in all possible install/use-cases

[Achim Gratz]

Bastien writes:
> Thanks to patient and hard work of Achim, M-x org-version RET 
> should  now return something sensible in each use-case.

There are basically two use-cases, not-installed and installed.
Not-installed comes in three flavors, although the first one has some
hard to avoid pitfalls and should be considered dangerous.  If the
autoload files are not or not fully generated, then determining the
version is done at runtime like in former org versions and relies on the
existence of $(lispdir)/../UTILITIES/org-fixup.el — if that can't be
found either, a default "N/A" version string will be output (which
should only be possible if somehow the lisp directory from org has been
copied by hand someplace else).


1) Org uninstalled (and possibly uncompiled) from Git or tarball.

1a) No org-version.el or org-install.el exists in worktree.  Partially
supported configuration, org version is determined from git if possible
via UTILITIES/org-fixup.el.  However, Emacs versions delivered with
orgmode will provide autoloads that may or may not work with that
version of org (mixed installation).  If such a situation is
encountered, warn the user.  It can work if the autoloads from the
installation match the ones that would be generated for the worktree,
which generally is only the case if there is a relatively recent
installation in site-lisp.

1b) Autoload file org-install.el exists in worktree, but not
org-version.el.  Fully supported configuration, org version is
determined from git if possible via UTILITIES/org-fixup.el.

1c) Both org-version.el or org-install.el exist in worktree.
Recommended configuration for 1), org version is taken from
org-version.el (git never gets invoked).

2) Org installed.  Both org-version.el and org-install.el must exist
in install directory.  Only supported configuration for 2), org
version is taken from org-version.el (git never gets invoked since
UTILITIES/org-fixup.el is not available).

Any unsupported configuration should still yield a version string, but
it will contain "N/A" to alert the user about a botched org
installation.


If "N/A" or a wrong version number is shown from 'M-x org-version' or the
path shown after the Git version is not what it should be or you see a
"mixed installation!" there, then please check with 'M-x locate-library'
where org, org-install and org-version are found (or that they are _not_
found at all, depending on which use case above you are targeting).  If
they are found, they must all be found in the same directory.

If you have leftover files from an older installation, re-configure
load-path so that Emacs doesn't find them, remove them altogether if
they are expendable or do a 'make cleanall' if they are in the org
directory.  From there, pick your use-case and try to stick to it (or at
least do another 'make cleanall' before you switch).


Regards,
Achim.
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