;;; Commentary:
-;; TODO:
-;; - merge do-completion and complete-word
-;; - move all I/O out of do-completion
+;; Names starting with "minibuffer--" are for functions and variables that
+;; are meant to be for internal use only.
+
+;;; Todo:
+
+;; - Make read-file-name-predicate obsolete.
+;; - New command minibuffer-force-complete that chooses one of all-completions.
+;; - Add vc-file-name-completion-table to read-file-name-internal.
+;; - A feature like completing-help.el.
+;; - Make the `hide-spaces' arg of all-completions obsolete?
;;; Code:
(eval-when-compile (require 'cl))
+(defvar completion-all-completions-with-base-size nil
+ "If non-nil, `all-completions' may return the base-size in the last cdr.
+The base-size is the length of the prefix that is elided from each
+element in the returned list of completions. See `completion-base-size'.")
+
+;;; Completion table manipulation
+
+(defun completion--some (fun xs)
+ "Apply FUN to each element of XS in turn.
+Return the first non-nil returned value.
+Like CL's `some'."
+ (let (res)
+ (while (and (not res) xs)
+ (setq res (funcall fun (pop xs))))
+ res))
+
+(defun apply-partially (fun &rest args)
+ "Do a \"curried\" partial application of FUN to ARGS.
+ARGS is a list of the first N arguments to pass to FUN.
+The result is a new function that takes the remaining arguments,
+and calls FUN."
+ (lexical-let ((fun fun) (args1 args))
+ (lambda (&rest args2) (apply fun (append args1 args2)))))
+
+(defun complete-with-action (action table string pred)
+ "Perform completion ACTION.
+STRING is the string to complete.
+TABLE is the completion table, which should not be a function.
+PRED is a completion predicate.
+ACTION can be one of nil, t or `lambda'."
+ ;; (assert (not (functionp table)))
+ (funcall
+ (cond
+ ((null action) 'try-completion)
+ ((eq action t) 'all-completions)
+ (t 'test-completion))
+ string table pred))
+
+(defun completion-table-dynamic (fun)
+ "Use function FUN as a dynamic completion table.
+FUN is called with one argument, the string for which completion is required,
+and it should return an alist containing all the intended possible completions.
+This alist may be a full list of possible completions so that FUN can ignore
+the value of its argument. If completion is performed in the minibuffer,
+FUN will be called in the buffer from which the minibuffer was entered.
+
+The result of the `dynamic-completion-table' form is a function
+that can be used as the ALIST argument to `try-completion' and
+`all-completions'. See Info node `(elisp)Programmed Completion'."
+ (lexical-let ((fun fun))
+ (lambda (string pred action)
+ (with-current-buffer (let ((win (minibuffer-selected-window)))
+ (if (window-live-p win) (window-buffer win)
+ (current-buffer)))
+ (complete-with-action action (funcall fun string) string pred)))))
+
+(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
+as an argument to `try-completion'), the function FUN is called with no
+arguments. FUN must return the completion table that will be stored in VAR.
+If completion is requested in the minibuffer, FUN will be called in the buffer
+from which the minibuffer was entered. The return value of
+`lazy-completion-table' must be used to initialize the value of VAR.
+
+You should give VAR a non-nil `risky-local-variable' property."
+ (declare (debug (symbolp lambda-expr)))
+ (let ((str (make-symbol "string")))
+ `(completion-table-dynamic
+ (lambda (,str)
+ (when (functionp ,var)
+ (setq ,var (,fun)))
+ ,var))))
+
+(defun completion-table-with-context (prefix table string pred action)
+ ;; TODO: add `suffix' maybe?
+ ;; Notice that `pred' is not a predicate when called from read-file-name
+ ;; or Info-read-node-name-2.
+ (when (functionp pred)
+ (setq pred
+ (lexical-let ((pred pred))
+ ;; Predicates are called differently depending on the nature of
+ ;; the completion table :-(
+ (cond
+ ((vectorp table) ;Obarray.
+ (lambda (sym) (funcall pred (concat prefix (symbol-name sym)))))
+ ((hash-table-p table)
+ (lambda (s v) (funcall pred (concat prefix s))))
+ ((functionp table)
+ (lambda (s) (funcall pred (concat prefix s))))
+ (t ;Lists and alists.
+ (lambda (s)
+ (funcall pred (concat prefix (if (consp s) (car s) s)))))))))
+ (let ((comp (complete-with-action action table string pred)))
+ (cond
+ ;; In case of try-completion, add the prefix.
+ ((stringp comp) (concat prefix comp))
+ ;; In case of non-empty all-completions,
+ ;; add the prefix size to the base-size.
+ ((consp comp)
+ (let ((last (last comp)))
+ (when completion-all-completions-with-base-size
+ (setcdr last (+ (or (cdr last) 0) (length prefix))))
+ comp))
+ (t comp))))
+
+(defun completion-table-with-terminator (terminator table string pred action)
+ (cond
+ ((eq action nil)
+ (let ((comp (try-completion string table pred)))
+ (if (eq comp t)
+ (concat string terminator)
+ (if (and (stringp comp)
+ (eq (try-completion comp table pred) t))
+ (concat comp terminator)
+ comp))))
+ ((eq action t) (all-completions string table pred))
+ ;; completion-table-with-terminator is always used for
+ ;; "sub-completions" so it's only called if the terminator is missing,
+ ;; in which case `test-completion' should return nil.
+ ((eq action 'lambda) nil)))
+
+(defun completion-table-with-predicate (table pred1 strict string pred2 action)
+ "Make a completion table equivalent to TABLE but filtered through PRED1.
+PRED1 is a function of one argument which returns non-nil iff the
+argument is an element of TABLE which should be considered for completion.
+STRING, PRED2, and ACTION are the usual arguments to completion tables,
+as described in `try-completion', `all-completions', and `test-completion'.
+If STRICT is t, the predicate always applies; if nil it only applies if
+it does not reduce the set of possible completions to nothing.
+Note: TABLE needs to be a proper completion table which obeys predicates."
+ (cond
+ ((and (not strict) (eq action 'lambda))
+ ;; Ignore pred1 since it doesn't really have to apply anyway.
+ (test-completion string table pred2))
+ (t
+ (or (complete-with-action action table string
+ (if (null pred2) pred1
+ (lexical-let ((pred1 pred2) (pred2 pred2))
+ (lambda (x)
+ ;; Call `pred1' first, so that `pred2'
+ ;; really can't tell that `x' is in table.
+ (if (funcall pred1 x) (funcall pred2 x))))))
+ ;; If completion failed and we're not applying pred1 strictly, try
+ ;; again without pred1.
+ (and (not strict)
+ (complete-with-action action table string pred2))))))
+
+(defun completion-table-in-turn (&rest tables)
+ "Create a completion table that tries each table in TABLES in turn."
+ (lexical-let ((tables tables))
+ (lambda (string pred action)
+ (completion--some (lambda (table)
+ (complete-with-action action table string pred))
+ tables))))
+
+;; (defmacro complete-in-turn (a b) `(completion-table-in-turn ,a ,b))
+;; (defmacro dynamic-completion-table (fun) `(completion-table-dynamic ,fun))
+(define-obsolete-function-alias
+ 'complete-in-turn 'completion-table-in-turn "23.1")
+(define-obsolete-function-alias
+ 'dynamic-completion-table 'completion-table-dynamic "23.1")
+
+;;; Minibuffer completion
+
+(defgroup minibuffer nil
+ "Controlling the behavior of the minibuffer."
+ :link '(custom-manual "(emacs)Minibuffer")
+ :group 'environment)
+
(defun minibuffer-message (message &rest args)
"Temporarily display MESSAGE at the end of the minibuffer.
The text is displayed for `minibuffer-message-timeout' seconds,
If ARGS are provided, then pass MESSAGE through `format'."
;; Clear out any old echo-area message to make way for our new thing.
(message nil)
- (unless (string-match "\\[.+\\]" message)
- (setq message (concat " [" message "]")))
+ (setq message (if (and (null args) (string-match "\\[.+\\]" message))
+ ;; Make sure we can put-text-property.
+ (copy-sequence message)
+ (concat " [" message "]")))
(when args (setq message (apply 'format message args)))
(let ((ol (make-overlay (point-max) (point-max) nil t t)))
(unwind-protect
(progn
+ (unless (zerop (length message))
+ ;; The current C cursor code doesn't know to use the overlay's
+ ;; marker's stickiness to figure out whether to place the cursor
+ ;; before or after the string, so let's spoon-feed it the pos.
+ (put-text-property 0 1 'cursor t message))
(overlay-put ol 'after-string message)
(sit-for (or minibuffer-message-timeout 1000000)))
(delete-overlay ol))))
If the current buffer is not a minibuffer, erase its entire contents."
(delete-field))
-(defun minibuffer--maybe-completion-help ()
- (if completion-auto-help
- (minibuffer-completion-help)
- (minibuffer-message "Next char not unique")))
+(defcustom completion-auto-help t
+ "Non-nil means automatically provide help for invalid completion input.
+If the value is t the *Completion* buffer is displayed whenever completion
+is requested but cannot be done.
+If the value is `lazy', the *Completions* buffer is only displayed after
+the second failed attempt to complete."
+ :type '(choice (const nil) (const t) (const lazy))
+ :group 'minibuffer)
+
+(defvar completion-styles-alist
+ '((basic completion-basic-try-completion completion-basic-all-completions)
+ (emacs22 completion-emacs22-try-completion completion-emacs22-all-completions)
+ (emacs21 completion-emacs21-try-completion completion-emacs21-all-completions)
+ (partial-completion
+ completion-pcm-try-completion completion-pcm-all-completions))
+ "List of available completion styles.
+Each element has the form (NAME TRY-COMPLETION ALL-COMPLETIONS)
+where NAME is the name that should be used in `completion-styles',
+TRY-COMPLETION is the function that does the completion, and
+ALL-COMPLETIONS is the function that lists the completions.")
+
+(defcustom completion-styles '(basic partial-completion)
+ "List of completion styles to use."
+ :type `(repeat (choice ,@(mapcar (lambda (x) (list 'const (car x)))
+ completion-styles-alist)))
+ :group 'minibuffer
+ :version "23.1")
+
+(defun completion-try-completion (string table pred point)
+ "Try to complete STRING using completion table TABLE.
+Only the elements of table that satisfy predicate PRED are considered.
+POINT is the position of point within STRING.
+The return value can be either nil to indicate that there is no completion,
+t to indicate that STRING is the only possible completion,
+or a pair (STRING . NEWPOINT) of the completed result string together with
+a new position for point."
+ ;; The property `completion-styles' indicates that this functional
+ ;; completion-table claims to take care of completion styles itself.
+ ;; [I.e. It will most likely call us back at some point. ]
+ (if (and (symbolp table) (get table 'completion-styles))
+ ;; Extended semantics for functional completion-tables:
+ ;; They accept a 4th argument `point' and when called with action=nil
+ ;; and this 4th argument (a position inside `string'), they should
+ ;; return instead of a string a pair (STRING . NEWPOINT).
+ (funcall table string pred nil point)
+ (completion--some (lambda (style)
+ (funcall (nth 1 (assq style completion-styles-alist))
+ string table pred point))
+ completion-styles)))
-(defun minibuffer-do-completion ()
+(defun completion-all-completions (string table pred point)
+ "List the possible completions of STRING in completion table TABLE.
+Only the elements of table that satisfy predicate PRED are considered.
+POINT is the position of point within STRING.
+The return value is a list of completions and may contain the base-size
+in the last `cdr'."
+ ;; The property `completion-styles' indicates that this functional
+ ;; completion-table claims to take care of completion styles itself.
+ ;; [I.e. It will most likely call us back at some point. ]
+ (let ((completion-all-completions-with-base-size t))
+ (if (and (symbolp table) (get table 'completion-styles))
+ ;; Extended semantics for functional completion-tables:
+ ;; They accept a 4th argument `point' and when called with action=t
+ ;; and this 4th argument (a position inside `string'), they may
+ ;; return BASE-SIZE in the last `cdr'.
+ (funcall table string pred t point)
+ (completion--some (lambda (style)
+ (funcall (nth 2 (assq style completion-styles-alist))
+ string table pred point))
+ completion-styles))))
+
+(defun minibuffer--bitset (modified completions exact)
+ (logior (if modified 4 0)
+ (if completions 2 0)
+ (if exact 1 0)))
+
+(defun completion--do-completion (&optional try-completion-function)
"Do the completion and return a summary of what happened.
-C = There were available completions.
-E = After completion we now have an exact match.
-M = Completion was performed, the text was Modified.
-
- CEM
- 000 0 no possible completion
- 010 1 was already an exact and unique completion
- 110 3 was already an exact completion
- 111 4 completed to an exact completion
- 101 5 some completion happened
- 100 6 no completion happened"
- (let* ((string (minibuffer-completion-contents))
- (completion (try-completion (field-string)
- minibuffer-completion-table
- minibuffer-completion-predicate)))
- (setq last-exact-completion nil)
+M = completion was performed, the text was Modified.
+C = there were available Completions.
+E = after completion we now have an Exact match.
+
+ MCE
+ 000 0 no possible completion
+ 001 1 was already an exact and unique completion
+ 010 2 no completion happened
+ 011 3 was already an exact completion
+ 100 4 ??? impossible
+ 101 5 ??? impossible
+ 110 6 some completion happened
+ 111 7 completed to an exact completion"
+ (let* ((beg (field-beginning))
+ (end (field-end))
+ (string (buffer-substring beg end))
+ (comp (funcall (or try-completion-function
+ 'completion-try-completion)
+ string
+ minibuffer-completion-table
+ minibuffer-completion-predicate
+ (- (point) beg))))
(cond
- ((null completion)
- (ding) (minibuffer-message "No match") 0)
- ((eq t completion) 1) ;Exact and unique match.
+ ((null comp)
+ (ding) (minibuffer-message "No match") (minibuffer--bitset nil nil nil))
+ ((eq t comp) (minibuffer--bitset nil nil t)) ;Exact and unique match.
(t
;; `completed' should be t if some completion was done, which doesn't
;; include simply changing the case of the entered string. However,
;; for appearance, the string is rewritten if the case changes.
- (let ((completed (not (eq t (compare-strings completion nil nil
- string nil nil t))))
- (unchanged (eq t (compare-strings completion nil nil
- string nil nil nil))))
+ (let* ((comp-pos (cdr comp))
+ (completion (car comp))
+ (completed (not (eq t (compare-strings completion nil nil
+ string nil nil t))))
+ (unchanged (eq t (compare-strings completion nil nil
+ string nil nil nil))))
(unless unchanged
- (let ((beg (field-beginning))
- (end (point)))
- (insert completion)
- (delete-region beg end)))
+
+ ;; Insert in minibuffer the chars we got.
+ (goto-char end)
+ (insert completion)
+ (delete-region beg end)
+ (goto-char (+ beg comp-pos)))
+
(if (not (or unchanged completed))
;; The case of the string changed, but that's all. We're not sure
;; whether this is a unique completion or not, so try again using
;; the real case (this shouldn't recurse again, because the next
;; time try-completion will return either t or the exact string).
- (minibuffer-do-completion)
+ (completion--do-completion try-completion-function)
;; It did find a match. Do we match some possibility exactly now?
- (let ((exact (test-completion (field-string)
+ (let ((exact (test-completion completion
minibuffer-completion-table
minibuffer-completion-predicate)))
- (cond
- ((not exact)
- (if completed 5
- (minibuffer--maybe-completion-help)
- 6))
- (completed 4)
- (t
- ;; If the last exact completion and this one were the same,
- ;; it means we've already given a "Complete but not unique"
- ;; message and the user's hit TAB again, so now we give him help.
- (if (eq this-command last-command)
- (minibuffer-completion-help))
- 3)))))))))
+ (unless completed
+ ;; Show the completion table, if requested.
+ (cond
+ ((not exact)
+ (if (case completion-auto-help
+ (lazy (eq this-command last-command))
+ (t completion-auto-help))
+ (minibuffer-completion-help)
+ (minibuffer-message "Next char not unique")))
+ ;; If the last exact completion and this one were the same,
+ ;; it means we've already given a "Complete but not unique"
+ ;; message and the user's hit TAB again, so now we give him help.
+ ((eq this-command last-command)
+ (if completion-auto-help (minibuffer-completion-help)))))
+
+ (minibuffer--bitset completed t exact))))))))
(defun minibuffer-complete ()
"Complete the minibuffer contents as far as possible.
(scroll-other-window))
nil)
- (let ((i (minibuffer-do-completion)))
- (case i
- (0 nil)
- (1 (goto-char (field-end))
- (minibuffer-message "Sole completion")
- t)
- (3 (goto-char (field-end))
- (minibuffer-message "Complete, but not unique")
- t)
- (t t))))))
+ (case (completion--do-completion)
+ (0 nil)
+ (1 (goto-char (field-end))
+ (minibuffer-message "Sole completion")
+ t)
+ (3 (goto-char (field-end))
+ (minibuffer-message "Complete, but not unique")
+ t)
+ (t t)))))
(defun minibuffer-complete-and-exit ()
"If the minibuffer contents is a valid completion then exit.
Otherwise try to complete it. If completion leads to a valid completion,
a repetition of this command will exit."
(interactive)
- (cond
- ;; Allow user to specify null string
- ((= (field-beginning) (field-end)) (exit-minibuffer))
- ((test-completion (field-string)
- minibuffer-completion-table
- minibuffer-completion-predicate)
- (when completion-ignore-case
- ;; Fixup case of the field, if necessary.
- (let* ((string (field-string))
- (compl (try-completion string
- minibuffer-completion-table
- minibuffer-completion-predicate)))
- (when (and (stringp compl)
- ;; If it weren't for this piece of paranoia, I'd replace
- ;; the whole thing with a call to complete-do-completion.
- (= (length string) (length compl)))
- (let ((beg (field-beginning))
- (end (field-end)))
+ (let ((beg (field-beginning))
+ (end (field-end)))
+ (cond
+ ;; Allow user to specify null string
+ ((= beg end) (exit-minibuffer))
+ ((test-completion (buffer-substring beg end)
+ minibuffer-completion-table
+ minibuffer-completion-predicate)
+ (when completion-ignore-case
+ ;; Fixup case of the field, if necessary.
+ (let* ((string (buffer-substring beg end))
+ (compl (try-completion
+ string
+ minibuffer-completion-table
+ minibuffer-completion-predicate)))
+ (when (and (stringp compl)
+ ;; If it weren't for this piece of paranoia, I'd replace
+ ;; the whole thing with a call to do-completion.
+ (= (length string) (length compl)))
(goto-char end)
(insert compl)
- (delete-region beg end)))))
- (exit-minibuffer))
+ (delete-region beg end))))
+ (exit-minibuffer))
- ((eq minibuffer-completion-confirm 'confirm-only)
- ;; The user is permitted to exit with an input that's rejected
- ;; by test-completion, but at the condition to confirm her choice.
- (if (eq last-command this-command)
- (exit-minibuffer)
- (minibuffer-message "Confirm")
- nil))
+ ((eq minibuffer-completion-confirm 'confirm-only)
+ ;; The user is permitted to exit with an input that's rejected
+ ;; by test-completion, but at the condition to confirm her choice.
+ (if (eq last-command this-command)
+ (exit-minibuffer)
+ (minibuffer-message "Confirm")
+ nil))
- (t
- ;; Call do-completion, but ignore errors.
- (let ((i (condition-case nil
- (minibuffer-do-completion)
- (error 1))))
- (case i
+ (t
+ ;; Call do-completion, but ignore errors.
+ (case (condition-case nil
+ (completion--do-completion)
+ (error 1))
((1 3) (exit-minibuffer))
- (4 (if (not minibuffer-completion-confirm)
+ (7 (if (not minibuffer-completion-confirm)
(exit-minibuffer)
(minibuffer-message "Confirm")
nil))
(t nil))))))
-(defun minibuffer-complete-word ()
- "Complete the minibuffer contents at most a single word.
-After one word is completed as much as possible, a space or hyphen
-is added, provided that matches some possible completion.
-Return nil if there is no valid completion, else t."
- (interactive)
- (let* ((beg (field-beginning))
- (string (buffer-substring beg (point)))
- (completion (try-completion string
- minibuffer-completion-table
- minibuffer-completion-predicate)))
- (cond
- ((null completion)
- (ding) (minibuffer-message "No match") nil)
- ((eq t completion) nil) ;Exact and unique match.
- (t
+(defun completion--try-word-completion (string table predicate point)
+ (let ((comp (completion-try-completion string table predicate point)))
+ (if (not (consp comp))
+ comp
+
+ ;; If completion finds next char not unique,
+ ;; consider adding a space or a hyphen.
+ (when (= (length string) (length (car comp)))
+ (let ((exts '(" " "-"))
+ (before (substring string 0 point))
+ (after (substring string point))
+ tem)
+ (while (and exts (not (consp tem)))
+ (setq tem (completion-try-completion
+ (concat before (pop exts) after)
+ table predicate (1+ point))))
+ (if (consp tem) (setq comp tem))))
+
;; Completing a single word is actually more difficult than completing
;; as much as possible, because we first have to find the "current
;; position" in `completion' in order to find the end of the word
;; which makes it trivial to find the position, but with fancier
;; completion (plus env-var expansion, ...) `completion' might not
;; look anything like `string' at all.
-
- (when minibuffer-completing-file-name
- ;; In order to minimize the problem mentioned above, let's try to
- ;; reduce the different between `string' and `completion' by
- ;; mirroring some of the work done in read-file-name-internal.
- (let ((substituted (condition-case nil
- ;; Might fail when completing an env-var.
- (substitute-in-file-name string)
- (error string))))
- (unless (eq string substituted)
- (setq string substituted)
- (let ((end (point)))
- (insert substituted)
- (delete-region beg end)))))
-
- ;; Make buffer (before point) contain the longest match
- ;; of `string's tail and `completion's head.
- (let* ((startpos (max 0 (- (length string) (length completion))))
- (length (- (length string) startpos)))
- (while (and (> length 0)
- (not (eq t (compare-strings string startpos nil
- completion 0 length
- completion-ignore-case))))
- (setq startpos (1+ startpos))
- (setq length (1- length)))
-
- (setq string (substring string startpos))
- (delete-region beg (+ beg startpos)))
-
- ;; Now `string' is a prefix of `completion'.
+ (let* ((comppoint (cdr comp))
+ (completion (car comp))
+ (before (substring string 0 point))
+ (combined (concat before "\n" completion)))
+ ;; Find in completion the longest text that was right before point.
+ (when (string-match "\\(.+\\)\n.*?\\1" combined)
+ (let* ((prefix (match-string 1 before))
+ ;; We used non-greedy match to make `rem' as long as possible.
+ (rem (substring combined (match-end 0)))
+ ;; Find in the remainder of completion the longest text
+ ;; that was right after point.
+ (after (substring string point))
+ (suffix (if (string-match "\\`\\(.+\\).*\n.*\\1"
+ (concat after "\n" rem))
+ (match-string 1 after))))
+ ;; The general idea is to try and guess what text was inserted
+ ;; at point by the completion. Problem is: if we guess wrong,
+ ;; we may end up treating as "added by completion" text that was
+ ;; actually painfully typed by the user. So if we then cut
+ ;; after the first word, we may throw away things the
+ ;; user wrote. So let's try to be as conservative as possible:
+ ;; only cut after the first word, if we're reasonably sure that
+ ;; our guess is correct.
+ ;; Note: a quick survey on emacs-devel seemed to indicate that
+ ;; nobody actually cares about the "word-at-a-time" feature of
+ ;; minibuffer-complete-word, whose real raison-d'être is that it
+ ;; tries to add "-" or " ". One more reason to only cut after
+ ;; the first word, if we're really sure we're right.
+ (when (and (or suffix (zerop (length after)))
+ (string-match (concat
+ ;; Make submatch 1 as small as possible
+ ;; to reduce the risk of cutting
+ ;; valuable text.
+ ".*" (regexp-quote prefix) "\\(.*?\\)"
+ (if suffix (regexp-quote suffix) "\\'"))
+ completion)
+ ;; The new point in `completion' should also be just
+ ;; before the suffix, otherwise something more complex
+ ;; is going on, and we're not sure where we are.
+ (eq (match-end 1) comppoint)
+ ;; (match-beginning 1)..comppoint is now the stretch
+ ;; of text in `completion' that was completed at point.
+ (string-match "\\W" completion (match-beginning 1))
+ ;; Is there really something to cut?
+ (> comppoint (match-end 0)))
+ ;; Cut after the first word.
+ (let ((cutpos (match-end 0)))
+ (setq completion (concat (substring completion 0 cutpos)
+ (substring completion comppoint)))
+ (setq comppoint cutpos)))))
- ;; If completion finds next char not unique,
- ;; consider adding a space or a hyphen.
- (when (= (length string) (length completion))
- (let ((exts '(" " "-"))
- tem)
- (while (and exts (not (stringp tem)))
- (setq tem (try-completion (concat string (pop exts))
- minibuffer-completion-table
- minibuffer-completion-predicate)))
- (if (stringp tem) (setq completion tem))))
-
- (if (= (length string) (length completion))
- ;; If got no characters, print help for user.
- (progn
- (if completion-auto-help (minibuffer-completion-help))
- nil)
- ;; Otherwise insert in minibuffer the chars we got.
- (if (string-match "\\W" completion (length string))
- ;; First find first word-break in the stuff found by completion.
- ;; i gets index in string of where to stop completing.
- (setq completion (substring completion 0 (match-end 0))))
-
- (if (and (eq ?/ (aref completion (1- (length completion))))
- (eq ?/ (char-after)))
- (setq completion (substring completion 0 (1- (length completion)))))
-
- (let ((pos (point)))
- (insert completion)
- (delete-region beg pos)
- t))))))
+ (cons completion comppoint)))))
+
+
+(defun minibuffer-complete-word ()
+ "Complete the minibuffer contents at most a single word.
+After one word is completed as much as possible, a space or hyphen
+is added, provided that matches some possible completion.
+Return nil if there is no valid completion, else t."
+ (interactive)
+ (case (completion--do-completion 'completion--try-word-completion)
+ (0 nil)
+ (1 (goto-char (field-end))
+ (minibuffer-message "Sole completion")
+ t)
+ (3 (goto-char (field-end))
+ (minibuffer-message "Complete, but not unique")
+ t)
+ (t t)))
-(defun minibuffer-complete-insert-strings (strings)
+(defun completion--insert-strings (strings)
"Insert a list of STRINGS into the current buffer.
Uses columns to keep the listing readable but compact.
It also eliminates runs of equal strings."
(put-text-property (point) (progn (insert (cadr str)) (point))
'mouse-face nil)))))))
-(defvar completion-common-substring)
+(defvar completion-common-substring nil)
+(make-obsolete-variable 'completion-common-substring nil "23.1")
+
+(defvar completion-setup-hook nil
+ "Normal hook run at the end of setting up a completion list buffer.
+When this hook is run, the current buffer is the one in which the
+command to display the completion list buffer was run.
+The completion list buffer is available as the value of `standard-output'.
+See also `display-completion-list'.")
+
+(defface completions-first-difference
+ '((t (:inherit bold)))
+ "Face put on the first uncommon character in completions in *Completions* buffer."
+ :group 'completion)
+
+(defface completions-common-part
+ '((t (:inherit default)))
+ "Face put 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."
+ :group 'completion)
+
+(defun completion-hilit-commonality (completions prefix-len)
+ (when completions
+ (let* ((last (last completions))
+ (base-size (cdr last))
+ (com-str-len (- prefix-len (or base-size 0))))
+ ;; Remove base-size during mapcar, and add it back later.
+ (setcdr last nil)
+ (nconc
+ (mapcar
+ (lambda (elem)
+ (let ((str
+ (if (consp elem)
+ (car (setq elem (cons (copy-sequence (car elem))
+ (cdr elem))))
+ (setq elem (copy-sequence elem)))))
+ (put-text-property 0 com-str-len
+ 'font-lock-face 'completions-common-part
+ str)
+ (if (> (length str) com-str-len)
+ (put-text-property com-str-len (1+ com-str-len)
+ 'font-lock-face 'completions-first-difference
+ str)))
+ elem)
+ completions)
+ base-size))))
(defun display-completion-list (completions &optional common-substring)
"Display the list of completions, COMPLETIONS, using `standard-output'.
properties of `highlight'.
At the end, this runs the normal hook `completion-setup-hook'.
It can find the completion buffer in `standard-output'.
-The optional second arg COMMON-SUBSTRING is a string.
+The obsolete optional second arg COMMON-SUBSTRING is a string.
It is used to put faces, `completions-first-difference' and
-`completions-common-part' on the completion buffer. The
+`completions-common-part' on the completion buffer. The
`completions-common-part' face is put on the common substring
-specified by COMMON-SUBSTRING. If COMMON-SUBSTRING is nil
-and the current buffer is not the minibuffer, the faces are not put.
-Internally, COMMON-SUBSTRING is bound to `completion-common-substring'
-during running `completion-setup-hook'."
+specified by COMMON-SUBSTRING."
+ (if common-substring
+ (setq completions (completion-hilit-commonality
+ completions (length common-substring))))
(if (not (bufferp standard-output))
;; This *never* (ever) happens, so there's no point trying to be clever.
(with-temp-buffer
(goto-char (point-max))
(if (null completions)
(insert "There are no possible completions of what you have typed.")
-
+
(insert "Possible completions are:\n")
- (minibuffer-complete-insert-strings completions))))
+ (let ((last (last completions)))
+ ;; Get the base-size from the tail of the list.
+ (set (make-local-variable 'completion-base-size) (or (cdr last) 0))
+ (setcdr last nil)) ;Make completions a properly nil-terminated list.
+ (completion--insert-strings completions))))
+
+ ;; The hilit used to be applied via completion-setup-hook, so there
+ ;; may still be some code that uses completion-common-substring.
(let ((completion-common-substring common-substring))
(run-hooks 'completion-setup-hook))
nil)
(interactive)
(message "Making completion list...")
(let* ((string (field-string))
- (completions (all-completions
+ (completions (completion-all-completions
string
minibuffer-completion-table
minibuffer-completion-predicate
- t)))
+ (- (point) (field-beginning)))))
(message nil)
(if (and completions
- (or (cdr completions) (not (equal (car completions) string))))
+ (or (consp (cdr completions))
+ (not (equal (car completions) string))))
(with-output-to-temp-buffer "*Completions*"
- (display-completion-list (sort completions 'string-lessp)))
+ (let* ((last (last completions))
+ (base-size (cdr last)))
+ ;; Remove the base-size tail because `sort' requires a properly
+ ;; nil-terminated list.
+ (when last (setcdr last nil))
+ (display-completion-list (nconc (sort completions 'string-lessp)
+ base-size))))
;; If there are no completions, or if the current input is already the
;; only possible completion, then hide (previous&stale) completions.
;; A better solution would be to make deactivate-mark buffer-local
;; (or to turn it into a list of buffers, ...), but in the mean time,
;; this should do the trick in most cases.
- (setq deactivate_mark nil)
+ (setq deactivate-mark nil)
(throw 'exit nil))
(defun self-insert-and-exit ()
(ding))
(exit-minibuffer))
+(defun minibuffer--double-dollars (str)
+ (replace-regexp-in-string "\\$" "$$" str))
+
+(defun completion--make-envvar-table ()
+ (mapcar (lambda (enventry)
+ (substring enventry 0 (string-match "=" enventry)))
+ process-environment))
+
+(defun completion--embedded-envvar-table (string pred action)
+ (when (string-match (concat "\\(?:^\\|[^$]\\(?:\\$\\$\\)*\\)"
+ "$\\([[:alnum:]_]*\\|{\\([^}]*\\)\\)\\'")
+ string)
+ (let* ((beg (or (match-beginning 2) (match-beginning 1)))
+ (table (completion--make-envvar-table))
+ (prefix (substring string 0 beg)))
+ (if (eq (aref string (1- beg)) ?{)
+ (setq table (apply-partially 'completion-table-with-terminator
+ "}" table)))
+ (completion-table-with-context prefix table
+ (substring string beg)
+ pred action))))
+
+(defun completion--file-name-table (string pred action)
+ "Internal subroutine for `read-file-name'. Do not call this."
+ (if (and (zerop (length string)) (eq 'lambda action))
+ nil ; FIXME: why?
+ (let* ((dir (if (stringp pred)
+ ;; It used to be that `pred' was abused to pass `dir'
+ ;; as an argument.
+ (prog1 (expand-file-name pred) (setq pred nil))
+ default-directory))
+ (str (condition-case nil
+ (substitute-in-file-name string)
+ (error string)))
+ (name (file-name-nondirectory str))
+ (specdir (file-name-directory str))
+ (realdir (if specdir (expand-file-name specdir dir)
+ (file-name-as-directory dir))))
+
+ (cond
+ ((null action)
+ (let ((comp (file-name-completion name realdir
+ read-file-name-predicate)))
+ (if (stringp comp)
+ ;; Requote the $s before returning the completion.
+ (minibuffer--double-dollars (concat specdir comp))
+ ;; Requote the $s before checking for changes.
+ (setq str (minibuffer--double-dollars str))
+ (if (string-equal string str)
+ comp
+ ;; If there's no real completion, but substitute-in-file-name
+ ;; changed the string, then return the new string.
+ str))))
+
+ ((eq action t)
+ (let ((all (file-name-all-completions name realdir))
+ ;; Actually, this is not always right in the presence of
+ ;; envvars, but there's not much we can do, I think.
+ (base-size (length (file-name-directory string))))
+
+ ;; Check the predicate, if necessary.
+ (unless (memq read-file-name-predicate '(nil file-exists-p))
+ (let ((comp ())
+ (pred
+ (if (eq read-file-name-predicate 'file-directory-p)
+ ;; Brute-force speed up for directory checking:
+ ;; Discard strings which don't end in a slash.
+ (lambda (s)
+ (let ((len (length s)))
+ (and (> len 0) (eq (aref s (1- len)) ?/))))
+ ;; Must do it the hard (and slow) way.
+ read-file-name-predicate)))
+ (let ((default-directory realdir))
+ (dolist (tem all)
+ (if (funcall pred tem) (push tem comp))))
+ (setq all (nreverse comp))))
+
+ (if (and completion-all-completions-with-base-size (consp all))
+ ;; Add base-size, but only if the list is non-empty.
+ (nconc all base-size))
+
+ all))
+
+ (t
+ ;; Only other case actually used is ACTION = lambda.
+ (let ((default-directory dir))
+ (funcall (or read-file-name-predicate 'file-exists-p) str)))))))
+
+(defalias 'read-file-name-internal
+ (completion-table-in-turn 'completion--embedded-envvar-table
+ 'completion--file-name-table)
+ "Internal subroutine for `read-file-name'. Do not call this.")
+
+(defvar read-file-name-function nil
+ "If this is non-nil, `read-file-name' does its work by calling this function.")
+
+(defvar read-file-name-predicate nil
+ "Current predicate used by `read-file-name-internal'.")
+
+(defcustom read-file-name-completion-ignore-case
+ (if (memq system-type '(ms-dos windows-nt darwin macos vax-vms axp-vms))
+ t nil)
+ "Non-nil means when reading a file name completion ignores case."
+ :group 'minibuffer
+ :type 'boolean
+ :version "22.1")
+
+(defcustom insert-default-directory t
+ "Non-nil means when reading a filename start with default dir in minibuffer.
+
+When the initial minibuffer contents show a name of a file or a directory,
+typing RETURN without editing the initial contents is equivalent to typing
+the default file name.
+
+If this variable is non-nil, the minibuffer contents are always
+initially non-empty, and typing RETURN without editing will fetch the
+default name, if one is provided. Note however that this default name
+is not necessarily the same as initial contents inserted in the minibuffer,
+if the initial contents is just the default directory.
+
+If this variable is nil, the minibuffer often starts out empty. In
+that case you may have to explicitly fetch the next history element to
+request the default name; typing RETURN without editing will leave
+the minibuffer empty.
+
+For some commands, exiting with an empty minibuffer has a special meaning,
+such as making the current buffer visit no file in the case of
+`set-visited-file-name'."
+ :group 'minibuffer
+ :type 'boolean)
+
+;; Not always defined, but only called if next-read-file-uses-dialog-p says so.
+(declare-function x-file-dialog "xfns.c"
+ (prompt dir &optional default-filename mustmatch only-dir-p))
+
+(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.
+Default name to DEFAULT-FILENAME if user exits the minibuffer with
+the same non-empty string that was inserted by this function.
+ (If DEFAULT-FILENAME is omitted, the visited file name is used,
+ except that if INITIAL is specified, that combined with DIR is used.)
+If the user exits with an empty minibuffer, this function returns
+an empty string. (This can only happen if the user erased the
+pre-inserted contents or if `insert-default-directory' is nil.)
+Fourth arg MUSTMATCH non-nil means require existing file's name.
+ Non-nil and non-t means also require confirmation after completion.
+Fifth arg INITIAL specifies text to start with.
+If optional sixth arg PREDICATE is non-nil, possible completions and
+the resulting file name must satisfy (funcall PREDICATE NAME).
+DIR should be an absolute directory name. It defaults to the value of
+`default-directory'.
+
+If this command was invoked with the mouse, use a file dialog box if
+`use-dialog-box' is non-nil, and the window system or X toolkit in use
+provides a file dialog box.
+
+See also `read-file-name-completion-ignore-case'
+and `read-file-name-function'."
+ (unless dir (setq dir default-directory))
+ (unless (file-name-absolute-p dir) (setq dir (expand-file-name dir)))
+ (unless default-filename
+ (setq default-filename (if initial (expand-file-name initial dir)
+ buffer-file-name)))
+ ;; If dir starts with user's homedir, change that to ~.
+ (setq dir (abbreviate-file-name dir))
+ ;; Likewise for default-filename.
+ (if default-filename
+ (setq default-filename (abbreviate-file-name default-filename)))
+ (let ((insdef (cond
+ ((and insert-default-directory (stringp dir))
+ (if initial
+ (cons (minibuffer--double-dollars (concat dir initial))
+ (length (minibuffer--double-dollars dir)))
+ (minibuffer--double-dollars dir)))
+ (initial (cons (minibuffer--double-dollars initial) 0)))))
+
+ (if read-file-name-function
+ (funcall read-file-name-function
+ prompt dir default-filename mustmatch initial predicate)
+ (let ((completion-ignore-case read-file-name-completion-ignore-case)
+ (minibuffer-completing-file-name t)
+ (read-file-name-predicate (or predicate 'file-exists-p))
+ (add-to-history nil))
+
+ (let* ((val
+ (if (not (next-read-file-uses-dialog-p))
+ ;; We used to pass `dir' to `read-file-name-internal' by
+ ;; abusing the `predicate' argument. It's better to
+ ;; just use `default-directory', but in order to avoid
+ ;; changing `default-directory' in the current buffer,
+ ;; we don't let-bind it.
+ (lexical-let ((dir (file-name-as-directory
+ (expand-file-name dir))))
+ (minibuffer-with-setup-hook
+ (lambda () (setq default-directory dir))
+ (completing-read prompt 'read-file-name-internal
+ nil mustmatch insdef 'file-name-history
+ default-filename)))
+ ;; If DIR contains a file name, split it.
+ (let ((file (file-name-nondirectory dir)))
+ (when (and default-filename (not (zerop (length file))))
+ (setq default-filename file)
+ (setq dir (file-name-directory dir)))
+ (if default-filename
+ (setq default-filename
+ (expand-file-name default-filename dir)))
+ (setq add-to-history t)
+ (x-file-dialog prompt dir default-filename mustmatch
+ (eq predicate 'file-directory-p)))))
+
+ (replace-in-history (eq (car-safe file-name-history) val)))
+ ;; If completing-read returned the inserted default string itself
+ ;; (rather than a new string with the same contents),
+ ;; it has to mean that the user typed RET with the minibuffer empty.
+ ;; In that case, we really want to return ""
+ ;; so that commands such as set-visited-file-name can distinguish.
+ (when (eq val default-filename)
+ ;; In this case, completing-read has not added an element
+ ;; to the history. Maybe we should.
+ (if (not replace-in-history)
+ (setq add-to-history t))
+ (setq val ""))
+ (unless val (error "No file name specified"))
+
+ (if (and default-filename
+ (string-equal val (if (consp insdef) (car insdef) insdef)))
+ (setq val default-filename))
+ (setq val (substitute-in-file-name val))
+
+ (if replace-in-history
+ ;; Replace what Fcompleting_read added to the history
+ ;; with what we will actually return.
+ (let ((val1 (minibuffer--double-dollars val)))
+ (if history-delete-duplicates
+ (setcdr file-name-history
+ (delete val1 (cdr file-name-history))))
+ (setcar file-name-history val1))
+ (if add-to-history
+ ;; Add the value to the history--but not if it matches
+ ;; the last value already there.
+ (let ((val1 (minibuffer--double-dollars val)))
+ (unless (and (consp file-name-history)
+ (equal (car file-name-history) val1))
+ (setq file-name-history
+ (cons val1
+ (if history-delete-duplicates
+ (delete val1 file-name-history)
+ file-name-history)))))))
+ val)))))
+
+(defun internal-complete-buffer-except (&optional buffer)
+ "Perform completion on all buffers excluding BUFFER.
+Like `internal-complete-buffer', but removes BUFFER from the completion list."
+ (lexical-let ((except (if (stringp buffer) buffer (buffer-name buffer))))
+ (apply-partially 'completion-table-with-predicate
+ 'internal-complete-buffer
+ (lambda (name)
+ (not (equal (if (consp name) (car name) name) except)))
+ nil)))
+
+;;; Old-style completion, used in Emacs-21.
+
+(defun completion-emacs21-try-completion (string table pred point)
+ (let ((completion (try-completion string table pred)))
+ (if (stringp completion)
+ (cons completion (length completion))
+ completion)))
+
+(defun completion-emacs21-all-completions (string table pred point)
+ (completion-hilit-commonality
+ (all-completions string table pred t)
+ (length string)))
+
+;;; Basic completion, used in Emacs-22.
+
+(defun completion-emacs22-try-completion (string table pred point)
+ (let ((suffix (substring string point))
+ (completion (try-completion (substring string 0 point) table pred)))
+ (if (not (stringp completion))
+ completion
+ ;; Merge a trailing / in completion with a / after point.
+ ;; We used to only do it for word completion, but it seems to make
+ ;; sense for all completions.
+ ;; Actually, claiming this feature was part of Emacs-22 completion
+ ;; is pushing it a bit: it was only done in minibuffer-completion-word,
+ ;; which was (by default) not bound during file completion, where such
+ ;; slashes are most likely to occur.
+ (if (and (not (zerop (length completion)))
+ (eq ?/ (aref completion (1- (length completion))))
+ (not (zerop (length suffix)))
+ (eq ?/ (aref suffix 0)))
+ ;; This leaves point after the / .
+ (setq suffix (substring suffix 1)))
+ (cons (concat completion suffix) (length completion)))))
+
+(defun completion-emacs22-all-completions (string table pred point)
+ (completion-hilit-commonality
+ (all-completions (substring string 0 point) table pred t)
+ point))
+
+(defun completion-basic-try-completion (string table pred point)
+ (let ((suffix (substring string point))
+ (completion (try-completion (substring string 0 point) table pred)))
+ (if (not (stringp completion))
+ completion
+ ;; Merge end of completion with beginning of suffix.
+ ;; Simple generalization of the "merge trailing /" done in Emacs-22.
+ (when (and (not (zerop (length suffix)))
+ (string-match "\\(.+\\)\n\\1" (concat completion "\n" suffix)
+ ;; Make sure we don't compress things to less
+ ;; than we started with.
+ point)
+ ;; Just make sure we didn't match some other \n.
+ (eq (match-end 1) (length completion)))
+ (setq suffix (substring suffix (- (match-end 1) (match-beginning 1)))))
+
+ (cons (concat completion suffix) (length completion)))))
+
+(defalias 'completion-basic-all-completions 'completion-emacs22-all-completions)
+
+;;; Partial-completion-mode style completion.
+
+;; BUGS:
+
+;; - "minibuffer-s- TAB" with minibuffer-selected-window ends up with
+;; "minibuffer--s-" which matches other options.
+
+(defvar completion-pcm--delim-wild-regex nil)
+
+(defun completion-pcm--prepare-delim-re (delims)
+ (setq completion-pcm--delim-wild-regex (concat "[" delims "*]")))
+
+(defcustom completion-pcm-word-delimiters "-_. "
+ "A string of characters treated as word delimiters for completion.
+Some arcane rules:
+If `]' is in this string, it must come first.
+If `^' is in this string, it must not come first.
+If `-' is in this string, it must come first or right after `]'.
+In other words, if S is this string, then `[S]' must be a valid Emacs regular
+expression (not containing character ranges like `a-z')."
+ :set (lambda (symbol value)
+ (set-default symbol value)
+ ;; Refresh other vars.
+ (completion-pcm--prepare-delim-re value))
+ :initialize 'custom-initialize-reset
+ :group 'minibuffer
+ :type 'string)
+
+(defun completion-pcm--pattern-trivial-p (pattern)
+ (and (stringp (car pattern)) (null (cdr pattern))))
+
+(defun completion-pcm--string->pattern (basestr &optional point)
+ "Split BASESTR into a pattern.
+A pattern is a list where each element is either a string
+or a symbol chosen among `any', `star', `point'."
+ (if (and point (< point (length basestr)))
+ (let ((prefix (substring basestr 0 point))
+ (suffix (substring basestr point)))
+ (append (completion-pcm--string->pattern prefix)
+ '(point)
+ (completion-pcm--string->pattern suffix)))
+ (let ((pattern nil)
+ (p 0)
+ (p0 0))
+
+ (while (setq p (string-match completion-pcm--delim-wild-regex basestr p))
+ (push (substring basestr p0 p) pattern)
+ (if (eq (aref basestr p) ?*)
+ (progn
+ (push 'star pattern)
+ (setq p0 (1+ p)))
+ (push 'any pattern)
+ (setq p0 p))
+ (incf p))
+
+ ;; An empty string might be erroneously added at the beginning.
+ ;; It should be avoided properly, but it's so easy to remove it here.
+ (delete "" (nreverse (cons (substring basestr p0) pattern))))))
+
+(defun completion-pcm--pattern->regex (pattern &optional group)
+ (concat "\\`"
+ (mapconcat
+ (lambda (x)
+ (case x
+ ((star any point) (if group "\\(.*?\\)" ".*?"))
+ (t (regexp-quote x))))
+ pattern
+ "")))
+
+(defun completion-pcm--all-completions (pattern table pred)
+ "Find all completions for PATTERN in TABLE obeying PRED.
+PATTERN is as returned by `completion-pcm--string->pattern'."
+ ;; Find an initial list of possible completions.
+ (if (completion-pcm--pattern-trivial-p pattern)
+
+ ;; Minibuffer contains no delimiters -- simple case!
+ (all-completions (car pattern) table pred)
+
+ ;; Use all-completions to do an initial cull. This is a big win,
+ ;; since all-completions is written in C!
+ (let* (;; Convert search pattern to a standard regular expression.
+ (regex (completion-pcm--pattern->regex pattern))
+ (completion-regexp-list (cons regex completion-regexp-list))
+ (compl (all-completions
+ (if (stringp (car pattern)) (car pattern) "")
+ table pred))
+ (last (last compl)))
+ ;; FIXME: If `base-size' is not 0, we have a problem :-(
+ (if last (setcdr last nil))
+ (if (not (functionp table))
+ ;; The internal functions already obeyed completion-regexp-list.
+ compl
+ (let ((case-fold-search completion-ignore-case)
+ (poss ()))
+ (dolist (c compl)
+ (when (string-match regex c) (push c poss)))
+ poss)))))
+
+(defun completion-pcm-all-completions (string table pred point)
+ (let ((pattern (completion-pcm--string->pattern string point)))
+ (completion-pcm--all-completions pattern table pred)))
+
+(defun completion-pcm--merge-completions (strs pattern)
+ "Extract the commonality in STRS, with the help of PATTERN."
+ (cond
+ ((null (cdr strs)) (list (car strs)))
+ (t
+ (let ((re (completion-pcm--pattern->regex pattern 'group))
+ (ccs ())) ;Chopped completions.
+
+ ;; First chop each string into the parts corresponding to each
+ ;; non-constant element of `pattern', using regexp-matching.
+ (let ((case-fold-search completion-ignore-case))
+ (dolist (str strs)
+ (unless (string-match re str)
+ (error "Internal error: %s doesn't match %s" str re))
+ (let ((chopped ())
+ (i 1))
+ (while (match-beginning i)
+ (push (match-string i str) chopped)
+ (setq i (1+ i)))
+ ;; Add the text corresponding to the implicit trailing `any'.
+ (push (substring str (match-end 0)) chopped)
+ (push (nreverse chopped) ccs))))
+
+ ;; Then for each of those non-constant elements, extract the
+ ;; commonality between them.
+ (let ((res ()))
+ ;; Make the implicit `any' explicit. We could make it explicit
+ ;; everywhere, but it would slow down regexp-matching a little bit.
+ (dolist (elem (append pattern '(any)))
+ (if (stringp elem)
+ (push elem res)
+ (let ((comps ()))
+ (dolist (cc (prog1 ccs (setq ccs nil)))
+ (push (car cc) comps)
+ (push (cdr cc) ccs))
+ (let* ((prefix (try-completion "" comps))
+ (unique (or (and (eq prefix t) (setq prefix ""))
+ (eq t (try-completion prefix comps)))))
+ (unless (equal prefix "") (push prefix res))
+ ;; If there's only one completion, `elem' is not useful
+ ;; any more: it can only match the empty string.
+ ;; FIXME: in some cases, it may be necessary to turn an
+ ;; `any' into a `star' because the surrounding context has
+ ;; changed such that string->pattern wouldn't add an `any'
+ ;; here any more.
+ (unless unique (push elem res))))))
+ ;; We return it in reverse order.
+ res)))))
+
+(defun completion-pcm--pattern->string (pattern)
+ (mapconcat (lambda (x) (cond
+ ((stringp x) x)
+ ((eq x 'star) "*")
+ ((eq x 'any) "")
+ ((eq x 'point) "")))
+ pattern
+ ""))
+
+(defun completion-pcm-try-completion (string table pred point)
+ (let* ((pattern (completion-pcm--string->pattern string point))
+ (all (completion-pcm--all-completions pattern table pred)))
+ (when all
+ (let* ((mergedpat (completion-pcm--merge-completions all pattern))
+ ;; `mergedpat' is in reverse order.
+ (pointpat (or (memq 'point mergedpat) (memq 'any mergedpat)))
+ ;; New pos from the end.
+ (newpos (length (completion-pcm--pattern->string pointpat)))
+ ;; Do it afterwards because it changes `pointpat' by sideeffect.
+ (merged (completion-pcm--pattern->string (nreverse mergedpat))))
+ (cons merged (- (length merged) newpos))))))
+
+
(provide 'minibuffer)
+
+;; arch-tag: ef8a0a15-1080-4790-a754-04017c02f08f
;;; minibuffer.el ends here
HCoop / bpt / emacs.git / blobdiff