* lisp/eshell/em-cmpl.el (eshell-complete-parse-arguments): Handle
special references.
* lisp/eshell/em-arg.el (eshell-parse-special-reference): Ensure point
is just after the "#<" when incomplete, and handle backslash escapes
more thoroughly.
(eshell-complete-special-reference): New function.
* test/lisp/eshell/esh-arg-tests.el
(esh-arg-test/special-reference/default)
(esh-arg-test/special-reference/buffer)
(esh-arg-test/special-reference/special):
* test/lisp/eshell/em-cmpl-tests.el
(em-cmpl-test/special-ref-completion/type)
(em-cmpl-test/special-ref-completion/implicit-buffer)
(em-cmpl-test/special-ref-completion/buffer): New tests.
Previously, Eshell treated cases like the second argument in "tar
--directory=dir" as a variable assignment, but that prevented
'pcomplete/tar' from implementing its own completion for that
argument (bug#61778).
* lisp/eshell/esh-var.el (eshell-complete-variable-assignment): Only
handle completion when all initial arguments are variable assignments.
* test/lisp/eshell/em-cmpl-tests.el
(em-cmpl-test/variable-assign-completion/non-assignment): New test.
This provides a programmed completion function that works similarly to
~USER completion in 'completion-file-name-table'.
* lisp/eshell/em-dirs.el (eshell-complete-user-reference): Throw a
programmed completion function.
* test/lisp/eshell/em-cmpl-tests.el
(em-cmpl-test/user-ref-completion): Update test.
This also adds the ability for Pcomplete handlers to set their own
exit functions that will get called as appropriate.
* lisp/pcomplete.el (pcomplete-default-exit-function): New function.
(pcomplete-exit-function): New variable...
(pcomplete-completions-at-point): ... let-bind and use it.
* lisp/eshell/em-cmpl.el (eshell-complete-parse-arguments): Handle
quoted variables. We also build the 'posns' list from right-to-left
now.
* lisp/eshell/esh-var.el (eshell-envvar-names): Ensure that variable
aliases are included in this list.
(eshell-complete-variable-reference): Handle quoted variables and set
the exit function on the completions.
(eshell-variables-list): Simplify. We now add the trailing slash for
directories in the exit function inside
'eshell-complete-variable-reference'.
* test/lisp/eshell/em-cmpl-tests.el
(em-cmpl-test/quoted-variable-ref-completion)
(em-cmpl-test/variable-ref-completion/directory): New tests.
Eshell was already converting some types (numbers, nil) to strings, as
well as fixing up multiple-dot forms like ".../", so this way is more
consistent and should produce fewer problems for Pcomplete functions.
* lisp/eshell/em-cmpl.el (eshell-complete-parse-arguments): Always
convert parsed arguments to strings.
* test/lisp/eshell/em-cmpl-tests.el (eshell-arguments-equal,
eshell-arguments-equal--equal-explainer): New functions.
(em-cmpl-test/parse-arguments/pipeline)
(em-cmpl-test/parse-arguments/multiple-dots)
(em-cmpl-test/parse-arguments/variable/numeric)
(em-cmpl-test/parse-arguments/variable/nil)
(em-cmpl-test/parse-arguments/variable/list)
(em-cmpl-test/parse-arguments/variable/splice): Use
'eshell-arguments-equal'.
Previously, the code simply ignored the splice operator, which usually
worked, but isn't actually correct.
* lisp/eshell/em-cmpl.el (eshell-complete-eval-argument-form): New
function.
(eshell-complete-parse-arguments): Properly parse variable splices.
* test/lisp/eshell/em-cmpl-tests.el
(em-cmpl-test/parse-arguments/variable/splice): New test.
