bug#70217: [PATCH] Add substring-partial-completion style

[Spencer Baugh]

Tags: patch


The substring completion style completes "foo-bar" as "*foo-bar*".
The partial-completion completion style completes "foo-bar" as
"foo*bar*".

It is currently not possible to get completion as "*foo*bar*",
e.g. combining the two.

This patch adds a completion style that combines the two.  (It's a bit
rough right now, just a quick implementation, will clean it up with
feedback)

It's preferable for this to be a separate style from partial-completion
rather than a customization for partial-completion, because completing
with a leading glob is inefficient: it doesn't allow the completion
table to do any filtering at all.  So, for example, one might want the
regular partial-completion style to run first, and if it doesn't find
anything then the substring-partial-completion style can run.

Further claim: I think the substring completion style should be replaced
with the substring-partial-completion style in most places.  But that
may be a bit more controversial.

In GNU Emacs 29.2.50 (build 6, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2024-03-25 built on
 igm-qws-u22796a
Repository revision: 5d867aca5ea016c07fe9e8b60f55345f83012333
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Rocky Linux 8.9 (Green Obsidian)

Configured using:
 'configure -C --with-x-toolkit=lucid --with-native-compilation
 --with-gif=ifavailable'

0001-Add-substring-partial-completion-style.patch
Description: Text Data