* doc/lispref/minibuf.texi (Programmed Completion): Rework
annotation-function and affixation-function.
* lisp/help-fns.el (help--symbol-completion-table-annotation): Rename
from help--symbol-completion-table-affixation.
(help--symbol-completion-table): Use
help--symbol-completion-table-annotation.
* lisp/minibuffer.el (minibuffer-completion-help): Interpret
annotation-function with more sophistication.
* lisp/simple.el (read-extended-command): Use
read-extended-command--annotation
(read-extended-command--annotation): Rename from
read-extended-command--affixation
* lisp/progmodes/project.el (project--files-in-directory): Instead of
appending a slash (which doesn't work well with macOS find), remove
trailing slash and pass -H instead.
* doc/emacs/maintaining.texi (Bug Reference): Add section explaining
adding support for third-party packages.
* lisp/progmodes/bug-reference.el (bug-reference-maybe-setup-from-vc)
(bug-reference-maybe-setup-from-mail)
(bug-reference-maybe-setup-from-irc): Rename from
bug-reference--maybe-setup-from-*, i.e., un-privatize them because
they are advertised in the docs now.
The Edebug specification of 'if-let' and 'if-let*' doesn't work if the
body is empty. While that's a pathological case, it's not wrong per
se, and could arguably happen due to macro expansion.
* lisp/emacs-lisp/subr-x.el (when-let*, when-let): Don't reuse Edebug
specification from 'if-let*' and 'if-let'.
(mule--ucs-names-group): Simplify for using by group-function.
(read-char-by-name-group): Remove defcustom
obsoleted by completions-group.
(read-char-by-name): Mention completions-group and
completions-group-sort in docstring. Use group-function when
completions-group is non-nil.
https://lists.gnu.org/archive/html/emacs-devel/2021-05/msg00791.html
Sort the groups as returned by the `group-function` of the completion
table depending on the value of the customizable variable
`completions-group-sort`. By default `completions-group-sort` is set
to nil. The variable can be set to the symbol `alphabetical` in order
to configure alphabetical sorting. Furthermore, a custom sorting
function can be used as value of `completions-group-sort`.
* lisp/minibuffer.el (completions-group-sort): New variable.
(minibuffer--group-by): Add SORT-FUN argument.
(minibuffer-completion-help): Pass `completions-group-sort` to
`minibuffer--group-by`.
Insert the candidates vertically within the groups, but keep the
groups separate using the full width group separators.
* minibuffer.el (completion--insert-vertical): Adjust grouping.
The guard variable `completions-group` should be checked in each
completion table individually. The guard variable
`completions-detailed` variable is used in the same way.
* minibuffer.el (minibuffer-completion-help): Remove check of
`completions-group`.
Split `completion--insert-strings` into a function per completions
format in order to increase readability and extensibility. This
change eases the addition of more formats. Add support for group
titles to the vertical and horizontal formatting functions.
* minibuffer.el (completion--insert): Add new function.
(completion--insert-vertical, completion--insert-horizontal,
completion--insert-one-column): Extract function from
`completion--insert-strings`. Use new function `completion--insert`.
(completion--insert-strings): Use new insertion functions.
A completion table can specify a `group-function` in its metadata.
The group function takes two arguments, a completion candidate and a
transform argument. The group function is used to group the
candidates after sorting and to enhance the completion UI with group
titles.
If the transform argument is nil, the function must return the title
of the group to which the completion candidate belongs. The function
may also return nil if the candidate does not belong to a group.
If the transform argument is non-nil, the function must return the
transformed candidate. For example, the transformation allows to
remove a redundant part of the candidate, which is then displayed in
the title.
The grouping functionality is guarded by the customizable variable
`completions-group` and turned off by default for the *Completions*
buffer.
The specific form of the `group-function` has been chosen in order to
allow allocation-free grouping. This is important for completion UIs,
which continously update the displayed set of candidates (Icomplete,
Vertico, Ivy, etc.). Only when the transform argument is non-nil the
candidate transformation is performed, which may involve a string
allocation as done in the function `xref--completing-read-group`.
The function `xref-show-definitions-completing-read` makes use of the
`group-function`, by moving the file name prefix to the title. If
grouping is enabled, the *Completions* are displayed as
"linenum:summary" instead of "file:linenum:summary". This way the
*Completions* buffer resembles the *Occur* buffer.
* doc/lispref/minibuf.texi: Add documentation.
* lisp/minibuffer.el (completion-metadata): Describe the
`group-function` in the docstring.
(completions-group): Add guard variable, off by default.
(completions-group-format): Add variable defining the format string
for the group titles.
(completions-group-title): Add face used by `completions-group-format`
for the group titles.
(completions-group-separator): Add face used by
`completions-group-format` for the group separator lines.
(minibuffer--group-by): New grouping function.
(minibuffer-completion-help): Use it.
(display-completion-list): Add optional GROUP-FUN argument.
(completion--insert-strings): Add optional GROUP-FUN argument. Insert
group titles if `completions-format` is `one-column`. Transform each
candidate with the GROUP-FUN. Attach the untransformed candidate to
the property `completion--string`.
* lisp/simple.el (choose-completion): Retrieve the untransformed
completion candidate from the property `completion--string`.
* lisp/progmodes/xref.el:
(xref--completing-read-group): New grouping function.
(xref-show-definitions-completing-read): Use it.
* lisp/window.el (window-default-font-height): Avoid signaling an
error when a client TTY frame happens to have an X-style 'display'
parameter. (Bug#48408)
* lisp/cus-theme.el (custom-theme-summary): Don't limit the file to
having the deftheme form as the very first form, rather look for the
deftheme form explicitly.
Also remove redundant `:group` arguments.
(eshell-parse-modifiers): Make sure we pass a function value.
(eshell-parse-arg-modifier, eshell-parse-modifiers)
(eshell-add-pred-func, eshell-pred-user-or-group)
(eshell-pred-file-time, eshell-pred-file-type, eshell-pred-file-mode)
(eshell-pred-file-links, eshell-pred-file-size)
(eshell-pred-substitute, eshell-include-members, eshell-join-members)
(eshell-split-members): Use proper closures.
