;;; minibuffer.el --- Minibuffer completion functions -*- lexical-binding: t -*-
-;; Copyright (C) 2008-2013 Free Software Foundation, Inc.
+;; Copyright (C) 2008-2014 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Package: emacs
The result of the `completion-table-dynamic' form is a function
that can be used as the COLLECTION argument to `try-completion' and
-`all-completions'. See Info node `(elisp)Programmed Completion'."
+`all-completions'. See Info node `(elisp)Programmed Completion'.
+
+See also the related function `completion-table-with-cache'."
(lambda (string pred action)
(if (or (eq (car-safe action) 'boundaries) (eq action 'metadata))
;; `fun' is not supposed to return another function but a plain old
(current-buffer)))
(complete-with-action action (funcall fun string) string pred)))))
+(defun completion-table-with-cache (fun &optional ignore-case)
+ "Create dynamic completion table from function FUN, with cache.
+This is a wrapper for `completion-table-dynamic' that saves the last
+argument-result pair from FUN, so that several lookups with the
+same argument (or with an argument that starts with the first one)
+only need to call FUN once. This can be useful when FUN performs a
+relatively slow operation, such as calling an external process.
+
+When IGNORE-CASE is non-nil, FUN is expected to be case-insensitive."
+ ;; See eg bug#11906.
+ (let* (last-arg last-result
+ (new-fun
+ (lambda (arg)
+ (if (and last-arg (string-prefix-p last-arg arg ignore-case))
+ last-result
+ (prog1
+ (setq last-result (funcall fun arg))
+ (setq last-arg arg))))))
+ (completion-table-dynamic new-fun)))
+
(defmacro lazy-completion-table (var fun)
"Initialize variable VAR as a lazy completion table.
If the completion table VAR is used for the first time (e.g., by passing VAR
"Create a completion table that tries each table in TABLES in turn."
;; FIXME: the boundaries may come from TABLE1 even when the completion list
;; is returned by TABLE2 (because TABLE1 returned an empty list).
+ ;; Same potential problem if any of the tables use quoting.
(lambda (string pred action)
(completion--some (lambda (table)
(complete-with-action action table string pred))
tables)))
+(defun completion-table-merge (&rest tables)
+ "Create a completion table that collects completions from all TABLES."
+ ;; FIXME: same caveats as in `completion-table-in-turn'.
+ (lambda (string pred action)
+ (cond
+ ((null action)
+ (let ((retvals (mapcar (lambda (table)
+ (try-completion string table pred))
+ tables)))
+ (if (member string retvals)
+ string
+ (try-completion string
+ (mapcar (lambda (value)
+ (if (eq value t) string value))
+ (delq nil retvals))
+ pred))))
+ ((eq action t)
+ (apply #'append (mapcar (lambda (table)
+ (all-completions string table pred))
+ tables)))
+ (t
+ (completion--some (lambda (table)
+ (complete-with-action action table string pred))
+ tables)))))
+
(defun completion-table-with-quoting (table unquote requote)
;; A difficult part of completion-with-quoting is to map positions in the
;; quoted string to equivalent positions in the unquoted string and
completions))
((eq action 'completion--unquote)
- (let ((ustring (funcall unquote string))
- (uprefix (funcall unquote (substring string 0 pred))))
- ;; We presume (more or less) that `concat' and `unquote' commute.
- (cl-assert (string-prefix-p uprefix ustring))
- (list ustring table (length uprefix)
+ ;; PRED is really a POINT in STRING.
+ ;; We should return a new set (STRING TABLE POINT REQUOTE)
+ ;; where STRING is a new (unquoted) STRING to match against the new TABLE
+ ;; using a new POINT inside it, and REQUOTE is a requoting function which
+ ;; should reverse the unquoting, (i.e. it receives the completion result
+ ;; of using the new TABLE and should turn it into the corresponding
+ ;; quoted result).
+ (let* ((qpos pred)
+ (ustring (funcall unquote string))
+ (uprefix (funcall unquote (substring string 0 qpos)))
+ ;; FIXME: we really should pass `qpos' to `unquote' and have that
+ ;; function give us the corresponding `uqpos'. But for now we
+ ;; presume (more or less) that `concat' and `unquote' commute.
+ (uqpos (if (string-prefix-p uprefix ustring)
+ ;; Yay!! They do seem to commute!
+ (length uprefix)
+ ;; They don't commute this time! :-(
+ ;; Maybe qpos is in some text that disappears in the
+ ;; ustring (bug#17239). Let's try a second chance guess.
+ (let ((usuffix (funcall unquote (substring string qpos))))
+ (if (string-suffix-p usuffix ustring)
+ ;; Yay!! They still "commute" in a sense!
+ (- (length ustring) (length usuffix))
+ ;; Still no luck! Let's just choose *some* position
+ ;; within ustring.
+ (/ (+ (min (length uprefix) (length ustring))
+ (max (- (length ustring) (length usuffix)) 0))
+ 2))))))
+ (list ustring table uqpos
(lambda (unquoted-result op)
(pcase op
(1 ;;try
;; part of the string (e.g. substitute-in-file-name).
(let ((requote
(when (completion-metadata-get metadata 'completion--unquote-requote)
+ (cl-assert (functionp table))
(let ((new (funcall table string point 'completion--unquote)))
(setq string (pop new))
(setq table (pop new))
(setq point (pop new))
+ (cl-assert (<= point (length string)))
(pop new))))
- (result
- (completion--some (lambda (style)
- (funcall (nth n (assq style
- completion-styles-alist))
- string table pred point))
- (completion--styles metadata))))
+ (result
+ (completion--some (lambda (style)
+ (funcall (nth n (assq style
+ completion-styles-alist))
+ string table pred point))
+ (completion--styles metadata))))
(if requote
(funcall requote result n)
result)))
(setq end (- end suffix-len))
(setq newtext (substring newtext 0 (- suffix-len))))
(goto-char beg)
- (insert-and-inherit newtext)
- (delete-region (point) (+ (point) (- end beg)))
+ (let ((length (- end beg))) ;Read `end' before we insert the text.
+ (insert-and-inherit newtext)
+ (delete-region (point) (+ (point) length)))
(forward-char suffix-len)))
(defcustom completion-cycle-threshold nil
If you repeat this command after it displayed such a list,
scroll the window of possible completions."
(interactive)
- (completion-in-region (minibuffer-prompt-end) (point-max)
- minibuffer-completion-table
- minibuffer-completion-predicate))
+ (when (<= (minibuffer-prompt-end) (point))
+ (completion-in-region (minibuffer-prompt-end) (point-max)
+ minibuffer-completion-table
+ minibuffer-completion-predicate)))
(defun completion--in-region-1 (beg end)
;; If the previous command was not this,
;; If end is in view, scroll up to the beginning.
(set-window-start window (point-min) nil)
;; Else scroll down one screen.
- (scroll-other-window))
+ (with-selected-window window
+ (scroll-up)))
nil)))
;; If we're cycling, keep on cycling.
((and completion-cycling completion-all-sorted-completions)
(defun minibuffer-force-complete-and-exit ()
"Complete the minibuffer with first of the matches and exit."
(interactive)
- (minibuffer-force-complete)
- (completion--complete-and-exit
- (minibuffer-prompt-end) (point-max) #'exit-minibuffer
- ;; If the previous completion completed to an element which fails
- ;; test-completion, then we shouldn't exit, but that should be rare.
- (lambda () (minibuffer-message "Incomplete"))))
+ (if (and (eq (minibuffer-prompt-end) (point-max))
+ minibuffer-default)
+ ;; Use the provided default if there's one (bug#17545).
+ (minibuffer-complete-and-exit)
+ (minibuffer-force-complete)
+ (completion--complete-and-exit
+ (minibuffer-prompt-end) (point-max) #'exit-minibuffer
+ ;; If the previous completion completed to an element which fails
+ ;; test-completion, then we shouldn't exit, but that should be rare.
+ (lambda () (minibuffer-message "Incomplete")))))
(defun minibuffer-force-complete (&optional start end)
"Complete the minibuffer to an exact match.
(interactive)
(let ((completion-extra-properties extra-prop))
(completion-in-region start (point) table pred)))))
- (set-temporary-overlay-map
+ (set-transient-map
(let ((map (make-sparse-keymap)))
(define-key map [remap completion-at-point] cmd)
(define-key map (vector last-command-event) cmd)
(before (substring string 0 point))
(after (substring string point))
tem)
+ ;; If both " " and "-" lead to completions, prefer " " so SPC behaves
+ ;; a bit more like a self-inserting key (bug#17375).
(while (and exts (not (consp tem)))
(setq tem (completion-try-completion
(concat before (pop exts) after)
(defface completions-first-difference
'((t (:inherit bold)))
- "Face added on the first uncommon character in completions in *Completions* buffer.")
+ "Face for the first uncommon character in completions.
+See also the face `completions-common-part'.")
(defface completions-common-part '((t nil))
- "Face added on the common prefix substring in completions in *Completions* buffer.
-The idea of `completions-common-part' is that you can use it to
-make the common parts less visible than normal, so that the rest
-of the differing parts is, by contrast, slightly highlighted.")
-
-(defun completion-hilit-commonality (completions prefix-len base-size)
+ "Face for the common prefix substring in completions.
+The idea of this face is that you can use it to make the common parts
+less visible than normal, so that the differing parts are emphasized
+by contrast.
+See also the face `completions-first-difference'.")
+
+(defun completion-hilit-commonality (completions prefix-len &optional base-size)
+ "Apply font-lock highlighting to a list of completions, COMPLETIONS.
+PREFIX-LEN is an integer. BASE-SIZE is an integer or nil (meaning zero).
+
+This adds the face `completions-common-part' to the first
+\(PREFIX-LEN - BASE-SIZE) characters of each completion, and the face
+`completions-first-difference' to the first character after that.
+
+It returns a list with font-lock properties applied to each element,
+and with BASE-SIZE appended as the last element."
(when completions
(let ((com-str-len (- prefix-len (or base-size 0))))
(nconc
(exit-minibuffer))
(defvar completion-in-region-functions nil
- "Wrapper hook around `completion-in-region'.")
+ "Wrapper hook around `completion--in-region'.")
(make-obsolete-variable 'completion-in-region-functions
'completion-in-region-function "24.4")
(defvar completion-in-region-function #'completion--in-region
"Function to perform the job of `completion-in-region'.
The function is called with 4 arguments: START END COLLECTION PREDICATE.
-The arguments and expected return value are like the ones of
+The arguments and expected return value are as specified for
`completion-in-region'.")
(defvar completion-in-region--data nil)
(defun completion-in-region (start end collection &optional predicate)
"Complete the text between START and END using COLLECTION.
-Return nil if there is no valid completion, else t.
Point needs to be somewhere between START and END.
-PREDICATE (a function called with no arguments) says when to
-exit."
+PREDICATE (a function called with no arguments) says when to exit.
+This calls the function that `completion-in-region-function' specifies
+\(passing the same four arguments that it received) to do the work,
+and returns whatever it does. The return value should be nil
+if there was no valid completion, else t."
(cl-assert (<= start (point)) (<= (point) end))
(funcall completion-in-region-function start end collection predicate))
:version "22.1")
(defun completion--in-region (start end collection &optional predicate)
+ "Default function to use for `completion-in-region-function'.
+Its arguments and return value are as specified for `completion-in-region'.
+This respects the wrapper hook `completion-in-region-functions'."
(with-wrapper-hook
;; FIXME: Maybe we should use this hook to provide a "display
;; completions" operation as well.
"Keymap activated during `completion-in-region'.")
;; It is difficult to know when to exit completion-in-region-mode (i.e. hide
-;; the *Completions*).
+;; the *Completions*). Here's how previous packages did it:
;; - lisp-mode: never.
;; - comint: only do it if you hit SPC at the right time.
;; - pcomplete: pop it down on SPC or after some time-delay.
(defun read-file-name (prompt &optional dir default-filename mustmatch initial predicate)
"Read file name, prompting with PROMPT and completing in directory DIR.
-Value is not expanded---you must call `expand-file-name' yourself.
+The return value is not expanded---you must call `expand-file-name' yourself.
DIR is the directory to use for completing relative file names.
It should be an absolute directory name, or nil (which means the
(defcustom completion-pcm-complete-word-inserts-delimiters nil
"Treat the SPC or - inserted by `minibuffer-complete-word' as delimiters.
-Those chars are treated as delimiters iff this variable is non-nil.
+Those chars are treated as delimiters if this variable is non-nil.
I.e. if non-nil, M-x SPC will just insert a \"-\" in the minibuffer, whereas
if nil, it will list all possible commands in *Completions* because none of
the commands start with a \"-\" or a SPC."
(nconc (completion-pcm--hilit-commonality pattern all)
(length prefix)))))
-(defun completion--sreverse (str)
- "Like `reverse' but for a string STR rather than a list."
- (apply #'string (nreverse (mapcar 'identity str))))
-
(defun completion--common-suffix (strs)
"Return the common suffix of the strings STRS."
- (completion--sreverse
- (try-completion
- ""
- (mapcar #'completion--sreverse strs))))
+ (nreverse (try-completion "" (mapcar #'reverse strs))))
(defun completion-pcm--merge-completions (strs pattern)
"Extract the commonality in STRS, with the help of PATTERN.
;; Not `prefix'.
mergedpat))
;; New pos from the start.
- (newpos (length (completion-pcm--pattern->string pointpat)))
+ (newpos (length (completion-pcm--pattern->string pointpat)))
;; Do it afterwards because it changes `pointpat' by side effect.
(merged (completion-pcm--pattern->string (nreverse mergedpat))))
- (setq suffix (completion--merge-suffix merged newpos suffix))
+ (setq suffix (completion--merge-suffix
+ ;; The second arg should ideally be "the position right
+ ;; after the last char of `merged' that comes from the text
+ ;; to be completed". But completion-pcm--merge-completions
+ ;; currently doesn't give us that info. So instead we just
+ ;; use the "last but one" position, which tends to work
+ ;; well in practice since `suffix' always starts
+ ;; with a boundary and we hence mostly/only care about
+ ;; merging this boundary (bug#15419).
+ merged (max 0 (1- (length merged))) suffix))
(cons (concat prefix merged suffix) (+ newpos (length prefix)))))))
(defun completion-pcm-try-completion (string table pred point)