Commit 8283a032 authored by João Távora's avatar João Távora

Add new 'flx' completion style

* lisp/minibuffer.el (completion-styles-alist): Add flx.
(completion-substring--all-completions): Accept
(completion-flx-all-completions, completion-flx-try-completion)
(completion-flx--make-flx-pattern): New functions.
parent 30c09955
Pipeline #680 failed with stage
in 60 minutes and 1 second
......@@ -788,6 +788,11 @@ Additionally the user can use the char \"*\" as a glob pattern.")
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"*foo*bar*\".")
completion-flx-try-completion completion-flx-all-completions
"Completion of an in-order subset of characters.
When completing \"foo\" the glob \"*f*o*o*\" is used, so that
i.e. foo can complete to frodo.")
completion-initials-try-completion completion-initials-all-completions
"Completion of acronyms and initialisms.
......@@ -3345,7 +3350,12 @@ the same set of elements."
;;; Substring completion
;; Mostly derived from the code of `basic' completion.
(defun completion-substring--all-completions (string table pred point)
(defun completion-substring--all-completions
(string table pred point &optional transform-pattern-fn)
"Match the presumed substring STRING to the entries in TABLE.
Respect PRED and POINT. The pattern used is a PCM-style
substring pattern, but it be massaged by TRANSFORM-PATTERN-FN, if
that is non-nil."
(let* ((beforepoint (substring string 0 point))
(afterpoint (substring string point))
(bounds (completion-boundaries beforepoint table pred afterpoint))
......@@ -3356,6 +3366,9 @@ the same set of elements."
(pattern (if (not (stringp (car basic-pattern)))
(cons 'prefix basic-pattern)))
(pattern (if transform-pattern-fn
(funcall transform-pattern-fn pattern)
(all (completion-pcm--all-completions prefix pattern table pred)))
(list all pattern prefix suffix (car bounds))))
......@@ -3375,6 +3388,62 @@ the same set of elements."
(nconc (completion-pcm--hilit-commonality pattern all)
(length prefix)))))
;; "flx" completion, also known as flex/fuzzy/glob completion
;; Complete "foo" to "frodo"
(defun completion-flx--make-flx-pattern (pattern)
"Convert PCM-style PATTERN into PCM-style flx pattern.
This turns
(prefix \"foo\" point)
(prefix \"f\" star \"o\" star \"o\" star point)
which is at the core of flx logic. The extra
'star' is optimized away later on."
(mapcan (lambda (elem)
(if (stringp elem)
(mapcan (lambda (char)
(list (string char) 'star))
(list elem)))
(defun completion-flx-try-completion (string table pred point)
"Try to flx-complete STRING in TABLE given PRED and POINT."
(pcase-let ((`(,all ,_pattern ,_prefix ,_suffix ,_carbounds)
string table pred point
(if minibuffer-completing-file-name
(setq all (completion-pcm--filename-try-filter all)))
(cond ((not (consp all))
(cond ((not (consp (cdr all))) ; single completion
(if (equal string (car all))
(cons (car all) (length (car all)))))
;; If more than one, try some basic substring
;; merging. This is acceptable in flx, i.e. it
;; shouldn't incorrectly remove any possible
;; candidates. If that fails, leave user input
;; untouched
(let ((probe (try-completion string all)))
(if (stringp probe)
(cons probe (length probe))
(cons string point)))))))))
(defun completion-flx-all-completions (string table pred point)
"Get flx-completions of STRING in TABLE, given PRED and POINT."
(pcase-let ((`(,all ,pattern ,prefix ,_suffix ,_carbounds)
string table pred point
(when all
(nconc (completion-pcm--hilit-commonality pattern all)
(length prefix)))))
;; Initials completion
;; Complete /ums to /usr/monnier/src or lch to list-command-history.
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