From 02a8b19c0e2d9650185a5ea1a16f540d38b1ead2 Mon Sep 17 00:00:00 2001 From: Spencer Baugh Date: Wed, 21 Aug 2024 11:59:42 -0400 Subject: [PATCH] Allow customizing partial-completion to be more like substring The substring completion style completes "foo-bar" as "*foo-bar*". The partial-completion completion style completes "foo-bar" as "foo*bar*". Previously, it was not possible to get completion of "foo-bar" to act as "*foo*bar*", e.g. combining the partial-completion and substring styles. This would be especially useful for things like project-find-file. Now it is possible by customizing the completion-pcm-anchored variable to a non-nil value. Furthermore, it's convenient to be able to run regular (completion-pcm-anchored=t, non-substring) partial-completion before running completion-pcm-anchored=nil partial-completion, since the former provides more narrowly targeted completions. It's possible to do this by customizing completion-styles. Just add '(partial-completion ((completion-pcm-anchored t))) and '(partial-completion ((completion-pcm-anchored nil))) in that order. Then the completion machinery will first run partial-completion with completion-pcm-anchored=t, and if that returns no completions, run partial-completion with completion-pcm-anchored=nil. * lisp/minibuffer.el (completion--nth-completion): Allow an element of completion-styles to contain a list of bindings. (completion-styles): Document that. (completion-pcm-anchored): Add. (completion-pcm--string->pattern): Check completion-pcm-anchored. (bug#70217) --- doc/emacs/mini.texi | 16 +++++++++++++-- etc/NEWS | 22 +++++++++++++++++++++ lisp/minibuffer.el | 48 ++++++++++++++++++++++++++++++++++++++------- 3 files changed, 77 insertions(+), 9 deletions(-) diff --git a/doc/emacs/mini.texi b/doc/emacs/mini.texi index 9d012cd6fbc..6b604412e88 100644 --- a/doc/emacs/mini.texi +++ b/doc/emacs/mini.texi @@ -543,8 +543,14 @@ Completion Styles @vindex completion-styles The list variable @code{completion-styles} specifies the completion -styles to use. Each list element is the name of a completion style (a -Lisp symbol). The available style symbols are stored in the variable +styles to use. Each list element is either the name of a completion +style (a Lisp symbol) or a list starting with the name of a completion +style followed by @code{let}-style list of bindings which will be in +effect for that completion style. Multiple elements of +@code{completion-styles} can name the same completion style with +different variable bindings. + +The available style symbols are stored in the variable @code{completion-styles-alist} (@pxref{Completion Variables,,, elisp, The Emacs Lisp Reference Manual}). The default completion styles are (in order): @@ -569,6 +575,12 @@ Completion Styles @dfn{wildcard}---it matches any string of characters at the corresponding position in the completion alternative. +@vindex completion-pcm-leading-wildcard +If @code{completion-pcm-leading-wildcard} is set to @code{t}, this style +always acts as if a @dfn{wildcard} is present at the start of the +minibuffer text, similar to the @code{substring} style. For example, +@samp{l-m} will complete to @samp{emacs-lisp-mode}. + @item emacs22 @cindex @code{emacs22}, completion style This completion style is similar to @code{basic}, except that it diff --git a/etc/NEWS b/etc/NEWS index 9a9b6ead241..e8cb91e0c87 100644 --- a/etc/NEWS +++ b/etc/NEWS @@ -43,6 +43,28 @@ The 'find-function', 'find-library', 'find-face-definition', and 'find-variable' commands now allow retrieving previous input using the usual minibuffer history commands. Each command has a separate history. +** Minibuffer and Completions + ++++ +*** New user option 'completion-pcm-leading-wildcard'. +This option configures how the partial-completion style does completion. +It defaults to nil, which preserves the existing behavior. When it is set +to t, the partial-completion style behaves more like the substring +style, in that a string being completed can match against a candidate +anywhere in the candidate string. + ++++ +*** 'completion-styles' now can contain lists of bindings. +In addition to being a symbol naming a completion style, an element of +'completion-styles' can now be a list of the form '(STYLE ((VARIABLE +VALUE) ...))' where STYLE is a symbol naming a completion style. +VARIABLE will be bound to VALUE (without evaluating it) while the style +is executing. This allows multiple references to the same style with +different values for completion-affecting variables like +'completion-pcm-leading-wildcard or 'completion-ignore-case'. This also +applies for the styles configuration in 'completion-category-overrides' +and 'completion-category-defaults'. + ** Windows diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el index 3beb3c06a18..6fae62b3904 100644 --- a/lisp/minibuffer.el +++ b/lisp/minibuffer.el @@ -1141,7 +1141,15 @@ completion-styles ;; and simply add "bar" to the end of the result. emacs22) "List of completion styles to use. -The available styles are listed in `completion-styles-alist'. +An element should be a symbol which is listed in +`completion-styles-alist'. + +An element can also be a list of the form +(STYLE ((VARIABLE VALUE) ...)) +STYLE must be a symbol listed in `completion-styles-alist', followed by +a `let'-style list of variable/value pairs. VARIABLE will be bound to +VALUE (without evaluating it) while the style is handling completion. +This allows repeating the same style with different configurations. Note that `completion-category-overrides' may override these styles for specific categories, such as files, buffers, etc." @@ -1284,11 +1292,18 @@ completion--nth-completion (result-and-style (seq-some (lambda (style) - (let ((probe (funcall - (or (nth n (assq style completion-styles-alist)) - (error "Invalid completion style %s" style)) - string table pred point))) - (and probe (cons probe style)))) + (let (symbols values) + (when (consp style) + (dolist (binding (cadr style)) + (push (car binding) symbols) + (push (cadr binding) values)) + (setq style (car style))) + (cl-progv symbols values + (let ((probe (funcall + (or (nth n (assq style completion-styles-alist)) + (error "Invalid completion style %s" style)) + string table pred point))) + (and probe (cons probe style)))))) (completion--styles md))) (adjust-fn (get (cdr result-and-style) 'completion--adjust-metadata))) (when (and adjust-fn metadata) @@ -3868,6 +3883,21 @@ completion-pcm--pattern-trivial-p (setq trivial nil))) trivial))) +(defcustom completion-pcm-leading-wildcard nil + "If non-nil, partial-completion completes as if there's a leading wildcard. + +If nil (the default), partial-completion requires a matching completion +alternative to have the same beginning as the first \"word\" in the +minibuffer text, where \"word\" is determined by +`completion-pcm-word-delimiters'. + +If non-nil, partial-completion allows any string of characters to occur +at the beginning of a completion alternative, as if a wildcard such as +\"*\" was present at the beginning of the minibuffer text. This makes +partial-completion behave more like the substring completion style." + :version "30.1" + :type 'boolean) + (defun completion-pcm--string->pattern (string &optional point) "Split STRING into a pattern. A pattern is a list where each element is either a string @@ -3918,7 +3948,11 @@ completion-pcm--string->pattern (when (> (length string) p0) (if pending (push pending pattern)) (push (substring string p0) pattern)) - (nreverse pattern)))) + (setq pattern (nreverse pattern)) + (when completion-pcm-leading-wildcard + (when (stringp (car pattern)) + (push 'prefix pattern))) + pattern))) (defun completion-pcm--optimize-pattern (p) ;; Remove empty strings in a separate phase since otherwise a "" -- 2.39.3