;;; helm-mode.el --- Enable helm completion everywhere. -*- lexical-binding: t -*- ;; Copyright (C) 2012 ~ 2019 Thierry Volpiatto ;; This program is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation, either version 3 of the License, or ;; (at your option) any later version. ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with this program. If not, see . ;;; Code: (require 'cl-lib) (require 'helm) (require 'helm-lib) (require 'helm-files) (defvar crm-separator) (defvar ido-everywhere) (defvar completion-flex-nospace) (defvar helm-completion--sorting-done) (defvar helm-mode) (declare-function ido-mode "ido.el") (declare-function helm-apropos-init "helm-elisp") (declare-function helm-lisp-completion-persistent-action "helm-elisp") (declare-function helm-lisp-completion-persistent-help "helm-elisp") (defgroup helm-mode nil "Enable helm completion." :group 'helm) (defcustom helm-completing-read-handlers-alist '((find-tag . helm-completing-read-default-find-tag) (xref-find-definitions . helm-completing-read-default-find-tag) (xref-find-references . helm-completing-read-default-find-tag) (ggtags-find-tag-dwim . helm-completing-read-default-find-tag) (tmm-menubar . nil) (find-file . nil) (execute-extended-command . nil) (dired-do-rename . helm-read-file-name-handler-1) (dired-do-copy . helm-read-file-name-handler-1) (dired-do-symlink . helm-read-file-name-handler-1) (dired-do-relsymlink . helm-read-file-name-handler-1) (dired-do-hardlink . helm-read-file-name-handler-1) (basic-save-buffer . helm-read-file-name-handler-1) (write-file . helm-read-file-name-handler-1) (write-region . helm-read-file-name-handler-1)) "Completing read functions for specific Emacs commands. By default `helm-mode' use `helm-completing-read-default-handler' to provide helm completion in each `completing-read' or `read-file-name' found, but other functions can be specified here for specific commands. This also allows disabling helm completion for some commands when needed. Each entry is a cons cell like (EMACS_COMMAND . COMPLETING-READ_HANDLER) where key and value are symbols. Each key is an Emacs command that use originaly `completing-read'. Each value maybe a helm function that takes same arguments as `completing-read' plus NAME and BUFFER, where NAME is the name of the new helm source and BUFFER the name of the buffer we will use, but it can be also a function not using helm, in this case the function should take the same args as `completing-read' and not be prefixed by \"helm-\". `helm' will use the name of the command calling `completing-read' as NAME and BUFFER will be computed as well with NAME but prefixed with \"*helm-mode-\". This function prefix name must start by \"helm-\" when it uses helm, otherwise `helm' assumes the function is not a helm function and expects the same args as `completing-read', this allows you to define a handler not using helm completion. Example: (defun foo/test () (interactive) (message \"%S\" (completing-read \"test: \" '(a b c d e)))) (defun helm-foo/test-completing-read-handler (prompt collection predicate require-match initial-input hist def inherit-input-method name buffer) (helm-comp-read prompt collection :marked-candidates t :name name :buffer buffer)) (add-to-list 'helm-completing-read-handlers-alist '(foo/test . helm-foo/test-completing-read-handler)) We want here to make the regular `completing-read' in `foo/test' return a list of candidate(s) instead of a single candidate. Note that this function will be reused for ALL the `completing-read' of this command, so it should handle all cases. E.g., if first `completing-read' completes against symbols and second `completing-read' should handle only buffer, your specialized function should handle both. If the value of an entry is nil completion will fall back to Emacs vanilla behaviour. Example: If you want to disable helm completion for `describe-function', use: (describe-function . nil) Ido is also supported, you can use `ido-completing-read' and `ido-read-file-name' as value of an entry or just 'ido. Example: Enable ido completion for `find-file': (find-file . ido) same as (find-file . ido-read-file-name) Note that you don't need to enable `ido-mode' for this to work, see `helm-mode' documentation." :group 'helm-mode :type '(alist :key-type symbol :value-type symbol)) (defcustom helm-comp-read-case-fold-search helm-case-fold-search "Default Local setting of `helm-case-fold-search' for `helm-comp-read'. See `helm-case-fold-search' for more info." :group 'helm-mode :type 'symbol) (defcustom helm-mode-handle-completion-in-region t "Whether to replace or not `completion-in-region-function'. This enables support for `completing-read-multiple' and `completion-at-point' when non--nil." :group 'helm-mode :type 'boolean) (defcustom helm-mode-no-completion-in-region-in-modes nil "A list of modes that do not want helm for `completion-in-region'." :group 'helm-mode :type 'boolean) (defcustom helm-mode-reverse-history t "Display history source after current source when non nil. Apply only in `helm-mode' handled commands." :group 'helm-mode :type 'boolean) (defcustom helm-completion-in-region-default-sort-fn 'helm-completion-in-region-sort-fn "The default sort function to sort candidates in completion-in-region. When nil no sorting is done. The function is a `filtered-candidate-transformer' function which takes two args CANDIDATES and SOURCE. The function must use the flag `helm-completion--sorting-done' and return CANDIDATES unchanged when the flag is nil. See default function `helm-completion-in-region-sort-fn' as example. It will be used only when `helm-completion-style' is either Emacs or helm, otherwise when helm-fuzzy style is used, the fuzzy sort function will be used." :group 'helm-mode :type 'function) (defcustom helm-mode-fuzzy-match nil "Enable fuzzy matching in `helm-mode' globally. This is deprecated, use instead helm-fuzzy as `helm-completion-style' or even better 'emacs as `helm-completion-style' and add 'flex to `completion-styles' (emacs-27) or 'helm-flex if 'flex is not available in `completion-styles-alist' (emacs-26)." :group 'helm-mode :type 'boolean) (make-obsolete-variable 'helm-mode-fuzzy-match 'helm-completion-style "3.6.0") (defcustom helm-completion-mark-suffix t "Push mark at end of suffix when non nil." :group 'helm-mode :type 'boolean) (defvar helm-mode-minibuffer-setup-hook-black-list '(minibuffer-completion-help) "Incompatible `minibuffer-setup-hook' functions go here. A list of symbols. `helm-mode' is rejecting all lambda's, byte-code fns and all functions belonging in this list from `minibuffer-setup-hook'. This is mainly needed to prevent \"*Completions*\" buffers to popup.") (defface helm-mode-prefix `((t ,@(and (>= emacs-major-version 27) '(:extend t)) (:background "red" :foreground "black"))) "Face used for prefix completion." :group 'helm-mode) (defvar helm-comp-read-map (let ((map (make-sparse-keymap))) (set-keymap-parent map helm-map) (define-key map (kbd "") 'helm-cr-empty-string) (define-key map (kbd "M-RET") 'helm-cr-empty-string) map) "Keymap for `helm-comp-read'.") (defun helm-mode-delete-char-backward-1 () (interactive) (condition-case err (call-interactively 'delete-backward-char) (text-read-only (if (with-selected-window (minibuffer-window) (not (string= (minibuffer-contents) ""))) (message "Trying to delete prefix completion, next hit will quit") (user-error "%s" (car err)))))) (put 'helm-mode-delete-char-backward-1 'helm-only t) (defun helm-mode-delete-char-backward-2 () (interactive) (condition-case _err (call-interactively 'delete-backward-char) (text-read-only (unless (with-selected-window (minibuffer-window) (string= (minibuffer-contents) "")) (with-helm-current-buffer (run-with-timer 0.1 nil (lambda () (call-interactively 'delete-backward-char)))) (helm-keyboard-quit))))) (put 'helm-mode-delete-char-backward-2 'helm-only t) (helm-multi-key-defun helm-mode-delete-char-backward-maybe "Delete char backward when text is not the prefix helm is completing against. First call warns user about deleting prefix completion. Second call deletes backward char in current-buffer and quits helm completion, letting the user start a new completion with a new prefix." '(helm-mode-delete-char-backward-1 helm-mode-delete-char-backward-2) 1) (defcustom helm-completion-style 'emacs "Style of completion to use in `completion-in-region'. This affects only `completion-at-point' and friends, and the `completing-read' using the default handler i.e. `helm-completing-read-default-handler'. NB: This has nothing to do with `completion-styles', it is independent from helm, but when using 'emacs as helm-completion-style helm will use the `completion-styles' for its completions. Up to the user to configure `completion-styles'. There are three possible values to use: - helm, use multi match regular helm completion. - helm-fuzzy, use fuzzy matching. Note that as usual when entering a space helm switch to multi matching mode. - emacs, use regular Emacs completion according to `completion-styles'. Note that even in this style, helm allows using multi match. Emacs-27 provides a style called `flex' that can be used aside `helm' style (see `completion-styles-alist'). When `flex' style is not available (Emacs<27) helm provides `helm-flex' style which is similar to `flex' and helm fuzzy matching. For a better experience, if you don't know what to use, set `completion-styles' to '(flex) if you are using emacs-27 or to \'(helm-flex) if you are using emacs-26 and keep 'emacs as default value for `helm-completion-style'. Advanced users can also have a look to `completion-category-overrides' to set styles according to category. Please use custom interface or `customize-set-variable' to set this, NOT `setq'." :group 'helm-mode :type '(choice (const :tag "Emacs" emacs) (const :tag "Helm" helm) (const :tag "Helm-fuzzy" helm-fuzzy)) :set (lambda (var val) (set var val) (if (memq val '(helm helm-fuzzy)) (define-key helm-comp-read-map (kbd "DEL") 'helm-mode-delete-char-backward-maybe) (define-key helm-comp-read-map (kbd "DEL") 'delete-backward-char)))) (defconst helm-completion--all-styles (let ((flex (if (assq 'flex completion-styles-alist) 'flex 'helm-flex))) (helm-fast-remove-dups (append (list 'helm flex) (mapcar 'car completion-styles-alist))))) (defconst helm-completion--styles-type `(repeat :tag "with other completion styles" (choice ,@(mapcar (lambda (x) (list 'const x)) helm-completion--all-styles)))) (defcustom helm-completion-styles-alist '((gud-mode . helm)) "Allow configuring `helm-completion-style' per mode. Each entry is a cons cell like (mode . style) where style must be a suitable value for `helm-completion-style'. When specifying emacs as style for a mode, `completion-styles' can be specified by using a cons cell specifying completion-styles to use with helm emacs style, e.g. (foo-mode . (emacs helm flex)) will set `completion-styles' to '(helm flex) for foo-mode. This affects only completions happening in buffers and not minibuffer completions, i.e. completing-read's." :group 'helm-mode :type `(alist :key-type (symbol :tag "Major Mode") :value-type (choice :tag "Use helm style or completion styles" (radio :tag "Helm Style" (const helm) (const helm-fuzzy) (const emacs)) (cons :tag "Completion Styles" (const :tag "Using Helm `emacs' style" emacs) ,helm-completion--styles-type)))) ;;; helm-comp-read ;; ;; (defvar helm-comp-read-use-marked nil "[INTERNAL] When non nil `helm-comp-read' will return marked candidates. Use this ONLY in `let', NOT globally, this allows third party packages to use a list as return value when `helm-mode' is enabled, e.g. (let ((helm-comp-read-use-marked t)) (completing-read \"test: \" '(a b c d e f g))) ") (defun helm-cr-empty-string () "Return empty string." (interactive) (with-helm-alive-p (helm-exit-and-execute-action (lambda (_candidate) (identity ""))))) (put 'helm-cr-empty-string 'helm-only t) (defun helm-mode--keyboard-quit () ;; Use this instead of `keyboard-quit' ;; to avoid deactivating mark in current-buffer. (let ((debug-on-quit nil)) (signal 'quit nil))) (cl-defun helm-comp-read-get-candidates (collection &optional test sort-fn alistp (input helm-pattern)) "Convert COLLECTION to list removing elements that don't match TEST. See `helm-comp-read' about supported COLLECTION arguments. SORT-FN is a predicate to sort COLLECTION. ALISTP when non--nil will not use `all-completions' to collect candidates because it doesn't handle alists correctly for helm. i.e In `all-completions' the car of each pair is used as value. In helm we want to use the cdr instead like \(display . real\), so we return the alist as it is with no transformation by `all-completions'. e.g \(setq A '((a . 1) (b . 2) (c . 3))) ==>((a . 1) (b . 2) (c . 3)) \(helm-comp-read \"test: \" A :alistp nil :exec-when-only-one t :initial-input \"a\") ==>\"a\" Which is not what we expect. \(helm-comp-read \"test: \" A :alistp t :exec-when-only-one t :initial-input \"1\") ==>\"1\" See docstring of `all-completions' for more info. INPUT is the string you want to complete against, defaulting to `helm-pattern' which is the value of what you enter in minibuffer. Note that when using a function as COLLECTION this value will be available with the input argument of the function only when using a sync source from `helm-comp-read', i.e. not using `:candidates-in-buffer', otherwise the function is called only once with an empty string as value for `helm-pattern' because `helm-pattern' is not yet computed, which is what we want otherwise data would not be fully collected at init time. If COLLECTION is an `obarray', a TEST should be needed. See `obarray'." ;; Ensure COLLECTION is computed from `helm-current-buffer' ;; because some functions used as COLLECTION work ;; only in the context of current-buffer (Issue #1030) . (with-helm-current-buffer (let ((cands (cond ((vectorp collection) (all-completions input collection test)) ((and (symbolp collection) (boundp collection) ;; Issue #324 history is let-bounded and given ;; quoted as hist argument of completing-read. ;; See example in `rcirc-browse-url'. (symbolp (symbol-value collection))) nil) ;; When collection is a symbol, most of the time ;; it should be a symbol used as a minibuffer-history. ;; The value of this symbol in this case return a list ;; of string which maybe are converted later as symbol ;; in special cases. ;; we treat here commandp as a special case as it return t ;; also with a string unless its last arg is provided. ;; Also, the history collections generally collect their ;; elements as string, so intern them to call predicate. ((and (symbolp collection) (boundp collection) test) (let ((predicate (lambda (elm) (condition-case _err (if (eq test 'commandp) (funcall test (intern elm)) (funcall test elm)) (wrong-type-argument (funcall test (intern elm))))))) (all-completions input (symbol-value collection) predicate))) ((and (symbolp collection) (boundp collection)) (all-completions input (symbol-value collection))) ;; Normally file completion should not be handled here, ;; but special cases like `find-file-at-point' do it. ;; Handle here specially such cases. ((and (functionp collection) (not (string= input "")) (or minibuffer-completing-file-name (eq (completion-metadata-get (completion-metadata input collection test) 'category) 'file))) (cl-loop for f in (funcall collection input test t) unless (member f '("./" "../")) if (string-match helm--url-regexp input) collect f else collect (concat (file-name-as-directory (helm-basedir input)) f))) ((functionp collection) (funcall collection input test t)) ((and alistp (null test)) collection) ;; Next test ensure circular objects are removed ;; with `all-completions' (Issue #1530). (t (all-completions input collection test))))) (if sort-fn (sort cands sort-fn) cands)))) (defun helm-cr--pattern-in-candidates-p (candidates) (or (assoc helm-pattern candidates) (assq (intern helm-pattern) candidates) (member helm-pattern candidates) (member (downcase helm-pattern) candidates) (member (upcase helm-pattern) candidates))) (defun helm-cr-default-transformer (candidates source) "Default filter candidate function for `helm-comp-read'." (let ((must-match (helm-attr 'must-match source)) unknown-pattern) (unless (or (eq must-match t) (string= helm-pattern "") ;; Check if pattern is already member of candidates. (helm-cr--pattern-in-candidates-p candidates)) (setq candidates (append (list ;; Unquote helm-pattern ;; when it is added ;; as candidate: Why? #2015 ;; (replace-regexp-in-string ;; "\\s\\" "" helm-pattern) helm-pattern) candidates)) ;; Notify pattern have been added to candidates. (setq unknown-pattern t)) (cl-loop for c in candidates for cand = (if (stringp c) (replace-regexp-in-string "\\s\\" "" c) c) for pat = (replace-regexp-in-string "\\s\\" "" helm-pattern) if (and (or (equal c pat) (equal c helm-pattern)) unknown-pattern) collect (cons (concat (propertize " " 'display (propertize "[?]" 'face 'helm-ff-prefix)) c) c) into lst else collect (if (and (stringp cand) (string-match "\n" cand)) (cons (replace-regexp-in-string "\n" "->" c) c) c) into lst finally return (helm-fast-remove-dups lst :test 'equal)))) (defun helm-comp-read--move-to-first-real-candidate () (helm-aif (helm-get-selection nil 'withprop) ;; Avoid error with candidates with an image as display (#2296). (when (equal (get-text-property 0 'display it) "[?]") (helm-next-line)))) (defun helm-cr-default (default cands) (delq nil (cond ((and (stringp default) (not (string= default "")) (string= helm-pattern "")) (cons default (delete default cands))) ((and (consp default) (string= helm-pattern "")) (append (cl-loop for d in default ;; Don't convert ;; nil to "nil" (i.e the string) ;; it will be delq'ed on top. for str = (if (null d) d (helm-stringify d)) when (member str cands) do (setq cands (delete d cands)) when str collect str) cands)) (t cands)))) ;;;###autoload (cl-defun helm-comp-read (prompt collection &key test initial-input default preselect (buffer "*Helm Completions*") must-match fuzzy reverse-history (requires-pattern 0) history input-history (case-fold helm-comp-read-case-fold-search) (del-input t) (persistent-action nil) (persistent-help "DoNothing") (mode-line helm-comp-read-mode-line) help-message (keymap helm-comp-read-map) (name "Helm Completions") header-name candidates-in-buffer match-part match-dynamic exec-when-only-one quit-when-no-cand (volatile t) sort fc-transformer hist-fc-transformer (marked-candidates helm-comp-read-use-marked) nomark (alistp t) (candidate-number-limit helm-candidate-number-limit) multiline allow-nest coerce (group 'helm)) "Read a string in the minibuffer, with helm completion. It is helm `completing-read' equivalent. - PROMPT is the prompt name to use. - COLLECTION can be a list, vector, obarray or hash-table. It can be also a function that receives three arguments: the values string, predicate and t. See `all-completions' for more details. Keys description: - TEST: A predicate called with one arg i.e candidate. - INITIAL-INPUT: Same as input arg in `helm'. - PRESELECT: See preselect arg of `helm'. - DEFAULT: This option is used only for compatibility with regular Emacs `completing-read' (Same as DEFAULT arg of `completing-read'). - BUFFER: Name of helm-buffer. - MUST-MATCH: Candidate selected must be one of COLLECTION. - FUZZY: Enable fuzzy matching. - REVERSE-HISTORY: When non--nil display history source after current source completion. - REQUIRES-PATTERN: Same as helm attribute, default is 0. - HISTORY: A list containing specific history, default is nil. When it is non--nil, all elements of HISTORY are displayed in a special source before COLLECTION. - INPUT-HISTORY: A symbol. The minibuffer input history will be stored there, if nil or not provided, `minibuffer-history' will be used instead. - CASE-FOLD: Same as `helm-case-fold-search'. - DEL-INPUT: Boolean, when non--nil (default) remove the partial minibuffer input from HISTORY is present. - PERSISTENT-ACTION: A function called with one arg i.e candidate. - PERSISTENT-HELP: A string to document PERSISTENT-ACTION. - MODE-LINE: A string or list to display in mode line. Default is `helm-comp-read-mode-line'. - KEYMAP: A keymap to use in this `helm-comp-read'. (the keymap will be shared with history source) - NAME: The name related to this local source. - HEADER-NAME: A function to alter NAME, see `helm'. - EXEC-WHEN-ONLY-ONE: Bound `helm-execute-action-at-once-if-one' to non--nil. (possibles values are t or nil). - VOLATILE: Use volatile attribute. - SORT: A predicate to give to `sort' e.g `string-lessp' Use this only on small data as it is inefficient. If you want to sort faster add a sort function to FC-TRANSFORMER. Note that FUZZY when enabled is already providing a sort function. - FC-TRANSFORMER: A `filtered-candidate-transformer' function or a list of functions. - HIST-FC-TRANSFORMER: A `filtered-candidate-transformer' function for the history source. - MARKED-CANDIDATES: If non--nil return candidate or marked candidates as a list. - NOMARK: When non--nil don't allow marking candidates. - ALISTP: (default is non--nil) See `helm-comp-read-get-candidates'. - CANDIDATES-IN-BUFFER: when non--nil use a source build with `helm-source-in-buffer' which is much faster. Argument VOLATILE have no effect when CANDIDATES-IN-BUFFER is non--nil. - MATCH-PART: Allow matching only one part of candidate. See match-part documentation in `helm-source'. - MATCH-DYNAMIC: See match-dynamic in `helm-source-sync' It has no effect when used with CANDIDATES-IN-BUFFER. - ALLOW-NEST: Allow nesting this `helm-comp-read' in a helm session. See `helm'. - MULTILINE: See multiline in `helm-source'. - COERCE: See coerce in `helm-source'. - GROUP: See group in `helm-source'. Any prefix args passed during `helm-comp-read' invocation will be recorded in `helm-current-prefix-arg', otherwise if prefix args were given before `helm-comp-read' invocation, the value of `current-prefix-arg' will be used. That means you can pass prefix args before or after calling a command that use `helm-comp-read'. See `helm-M-x' for example." (when (get-buffer helm-action-buffer) (kill-buffer helm-action-buffer)) (let ((action-fn `(("Sole action (Identity)" . (lambda (candidate) (if ,marked-candidates (helm-marked-candidates) (identity candidate))))))) (let* ((minibuffer-completion-predicate test) (minibuffer-completion-table collection) (helm-read-file-name-mode-line-string (replace-regexp-in-string "helm-maybe-exit-minibuffer" "helm-confirm-and-exit-minibuffer" helm-read-file-name-mode-line-string)) (get-candidates (lambda () (let ((cands (helm-comp-read-get-candidates ;; If `helm-pattern' is passed as INPUT ;; and :alistp is nil INPUT is passed to ;; `all-completions' which defeat helm ;; matching functions (multi match, fuzzy ;; etc...) issue #2134. collection test sort alistp (if (and match-dynamic (null candidates-in-buffer)) helm-pattern "")))) (helm-cr-default default cands)))) (history-get-candidates (lambda () (let ((cands (helm-comp-read-get-candidates history test nil alistp))) (when cands (delete "" (helm-cr-default default cands)))))) (src-hist (helm-build-sync-source (format "%s History" name) :candidates history-get-candidates :fuzzy-match fuzzy :multiline multiline :match-part match-part :filtered-candidate-transformer (append '((lambda (candidates sources) (cl-loop for i in candidates ;; Input is added to history in completing-read's ;; and may be regexp-quoted, so unquote it ;; but check if cand is a string (it may be at this stage ;; a symbol or nil) Issue #1553. when (stringp i) collect (replace-regexp-in-string "\\s\\" "" i)))) (and hist-fc-transformer (helm-mklist hist-fc-transformer))) :persistent-action persistent-action :persistent-help persistent-help :keymap keymap :must-match must-match :group group :coerce coerce :mode-line mode-line :help-message help-message :action action-fn)) (src (helm-build-sync-source name :candidates get-candidates :match-part match-part :multiline multiline :header-name header-name :filtered-candidate-transformer (let ((transformers (helm-mklist fc-transformer))) (append transformers (unless (member 'helm-cr-default-transformer transformers) '(helm-cr-default-transformer)))) :requires-pattern requires-pattern :persistent-action persistent-action :persistent-help persistent-help :fuzzy-match fuzzy :keymap keymap :must-match must-match :group group :coerce coerce :mode-line mode-line :match-dynamic match-dynamic :help-message help-message :action action-fn :volatile volatile)) (src-1 (helm-build-in-buffer-source name :data get-candidates :match-part match-part :multiline multiline :header-name header-name :filtered-candidate-transformer (append (helm-mklist fc-transformer) '(helm-cr-default-transformer)) :requires-pattern requires-pattern :persistent-action persistent-action :fuzzy-match fuzzy :keymap keymap :must-match must-match :group group :coerce coerce :persistent-help persistent-help :mode-line mode-line :help-message help-message :action action-fn)) (src-list (list src-hist (if candidates-in-buffer src-1 src))) (helm-execute-action-at-once-if-one exec-when-only-one) (helm-quit-if-no-candidate quit-when-no-cand) result) (when nomark (setq src-list (cl-loop for src in src-list collect (cons '(nomark) src)))) (when reverse-history (setq src-list (nreverse src-list))) (add-hook 'helm-after-update-hook 'helm-comp-read--move-to-first-real-candidate) (unwind-protect (setq result (helm :sources src-list :input initial-input :default default :preselect preselect :prompt prompt :resume 'noresume :keymap keymap ;; Needed with empty collection. :allow-nest allow-nest :candidate-number-limit candidate-number-limit :case-fold-search case-fold :history (and (symbolp input-history) input-history) :buffer buffer)) (remove-hook 'helm-after-update-hook 'helm-comp-read--move-to-first-real-candidate)) ;; Avoid adding an incomplete input to history. (when (and result history del-input) (cond ((and (symbolp history) ; History is a symbol. (not (symbolp (symbol-value history)))) ; Fix Issue #324. ;; Be sure history is not a symbol with a nil value. (helm-aif (symbol-value history) (setcar it result))) ((consp history) ; A list with a non--nil value. (setcar history result)) (t ; Possibly a symbol with a nil value. (set history (list result))))) (or result (helm-mode--keyboard-quit))))) ;; Generic completing-read ;; ;; Support also function as collection. ;; e.g M-x man is supported. ;; Support hash-table and vectors as collection. ;; NOTE: ;; Some crap emacs functions may not be supported ;; like ffap-alternate-file (bad use of completing-read) ;; and maybe others. ;; Provide a mode `helm-mode' which turn on ;; helm in all `completing-read' and `read-file-name' in Emacs. ;; (defvar helm-completion-mode-string " Helm") (defvar helm-completion-mode-quit-message "Helm completion disabled") (defvar helm-completion-mode-start-message "Helm completion enabled") ;;; Specialized handlers ;; ;; (defun helm-completing-read-symbols (prompt _collection test _require-match init hist default _inherit-input-method name buffer) "Specialized function for fast symbols completion in `helm-mode'." (require 'helm-elisp) (or (helm :sources (helm-build-in-buffer-source name :init (lambda () (helm-apropos-init (lambda (x) (and (funcall test x) (not (keywordp x)))) (or (car-safe default) default))) :filtered-candidate-transformer 'helm-apropos-default-sort-fn :help-message #'helm-comp-read-help-message :fuzzy-match helm-mode-fuzzy-match :persistent-action (lambda (candidate) (helm-lisp-completion-persistent-action candidate name)) :persistent-help (helm-lisp-completion-persistent-help)) :prompt prompt :buffer buffer :input init :history hist :resume 'noresume :default (or default "")) (helm-mode--keyboard-quit))) ;;; Generic completing read ;; ;; (defun helm-completing-read-default-1 (prompt collection test require-match init hist default _inherit-input-method name buffer &optional cands-in-buffer exec-when-only-one) "Call `helm-comp-read' with same args as `completing-read'. Extra optional arg CANDS-IN-BUFFER means use `candidates-in-buffer' method which is faster. It should be used when candidate list doesn't need to be rebuilt dynamically." (let ((history (or (car-safe hist) hist)) (initial-input (helm-aif (pcase init ((pred (stringp)) init) ;; INIT is a cons cell. (`(,l . ,_ll) l)) it))) (helm-comp-read prompt collection :test test :history history :reverse-history helm-mode-reverse-history :input-history history :must-match require-match :alistp nil :help-message #'helm-comp-read-help-message :name name :requires-pattern (if (and (stringp default) (string= default "") (or (eq require-match 'confirm) (eq require-match 'confirm-after-completion))) 1 0) :nomark (null helm-comp-read-use-marked) :candidates-in-buffer cands-in-buffer :exec-when-only-one exec-when-only-one :fuzzy helm-mode-fuzzy-match :buffer buffer ;; If DEF is not provided, fallback to empty string ;; to avoid `thing-at-point' to be appended on top of list :default (or default "") ;; Fail with special characters (e.g in gnus "nnimap+gmail:") ;; if regexp-quote is not used. ;; when init is added to history, it will be unquoted by ;; helm-comp-read. :initial-input initial-input))) (defun helm-completing-read-default-2 (prompt collection predicate require-match init hist default _inherit-input-method name buffer &optional _cands-in-buffer exec-when-only-one) "Call `helm-comp-read' with same args as `completing-read'. This handler uses dynamic matching which allows honouring `completion-styles'." (let* ((history (or (car-safe hist) hist)) (input (pcase init ((pred (stringp)) init) ;; INIT is a cons cell. (`(,l . ,_ll) l))) (completion-flex-nospace t) (completion-styles (helm--prepare-completion-styles 'nomode)) (metadata (or (completion-metadata (or input "") collection predicate) '(metadata))) (afun (or (plist-get completion-extra-properties :annotation-function) (completion-metadata-get metadata 'annotation-function))) (file-comp-p (eq (completion-metadata-get metadata 'category) 'file)) (compfn (lambda (str _predicate _action) (let* ((completion-ignore-case (helm-set-case-fold-search)) (comps (completion-all-completions str ; This is helm-pattern collection predicate (length str) metadata)) (last-data (last comps)) ;; Helm syle sort fn is added to ;; metadata only in emacs-27, so in ;; emacs-26 use helm-generic-sort-fn ;; which handle both helm and ;; helm-flex styles. When ;; helm-completion-style is helm or ;; helm-fuzzy, sorting will be done ;; later in FCT. (sort-fn (and (eq helm-completion-style 'emacs) (or ;; Emacs-27 (completion-metadata-get metadata 'display-sort-function) ;; Emacs-26 (lambda (candidates) (sort candidates #'helm-generic-sort-fn))))) all) (when (cdr last-data) ;; Remove the last element of ;; comps by side-effect. (setcdr last-data nil)) (setq helm-completion--sorting-done (and sort-fn t)) (setq all (copy-sequence comps)) ;; Default is passed here only with helm ;; h-c-styles, otherwise with emacs style it is ;; passed with the :default arg of helm-comp-read ;; and computed in its get-candidates function. (append (and default (memq helm-completion-style '(helm helm-fuzzy)) (list default)) (helm-completion-in-region--initial-filter (if (and sort-fn (> (length str) 0)) (funcall sort-fn all) all) afun file-comp-p))))) (data (if (memq helm-completion-style '(helm helm-fuzzy)) (funcall compfn (or input "") nil nil) compfn)) (helm-completion-in-region-default-sort-fn (lambda (candidates _source) (if (or helm-completion--sorting-done (string= helm-pattern "")) candidates (sort candidates 'helm-generic-sort-fn))))) (unwind-protect (helm-comp-read ;; Completion-at-point and friends have no prompt. prompt data :name name :initial-input input :buffer buffer :history history :nomark (null helm-comp-read-use-marked) :reverse-history helm-mode-reverse-history ;; In helm h-c-styles default is passed directly in ;; candidates. :default (and (eq helm-completion-style 'emacs) default) :fc-transformer ;; Ensure sort fn is at the end. (append '(helm-cr-default-transformer) (and helm-completion-in-region-default-sort-fn (list helm-completion-in-region-default-sort-fn))) :match-dynamic (eq helm-completion-style 'emacs) :fuzzy (eq helm-completion-style 'helm-fuzzy) :exec-when-only-one exec-when-only-one :must-match require-match) (setq helm-completion--sorting-done nil)))) (defun helm-completing-read-default-find-tag (prompt collection test require-match init hist default inherit-input-method name buffer) "Specialized `helm-mode' handler for `find-tag'." ;; Some commands like find-tag may use `read-file-name' from inside ;; the calculation of collection. in this case it clash with ;; candidates-in-buffer that reuse precedent data (files) which is wrong. ;; So (re)calculate collection outside of main helm-session. (let* ((cands (helm-comp-read-get-candidates collection test nil nil))) (helm-completing-read-default-1 prompt cands test require-match init hist default inherit-input-method name buffer t))) (defun helm-completing-read-sync-default-handler (prompt collection test require-match init hist default inherit-input-method name buffer) "`helm-mode' handler using sync source as backend." (helm-completing-read-default-1 prompt collection test require-match init hist default inherit-input-method name buffer)) (defun helm-completing-read-inbuffer-default-handler (prompt collection test require-match init hist default inherit-input-method name buffer) "`helm-mode' handler using inbuffer source as backend." (helm-completing-read-default-1 prompt collection test require-match init hist default inherit-input-method name buffer t)) (defun helm-completing-read-default-handler (prompt collection test require-match init hist default inherit-input-method name buffer) "Default `helm-mode' handler for all `completing-read'." (let* ((standard (memq helm-completion-style '(helm helm-fuzzy))) (fn (if standard #'helm-completing-read-default-1 #'helm-completing-read-default-2)) (helm-mode-fuzzy-match (eq helm-completion-style 'helm-fuzzy))) (apply fn prompt collection test require-match init hist default inherit-input-method name buffer standard))) (defun helm-mode--read-buffer-to-switch (prompt) "[INTERNAL] This is used to advice `read-buffer-to-switch'. Don't use it directly." ;; `read-buffer-to-switch' is passing `minibuffer-completion-table' ;; to `read-buffer' through `minibuffer-setup-hook' which is too ;; late to be known by `read-buffer-function', in our case ;; `helm--generic-read-buffer'. It should let bind it to allow us ;; using it. (let ((minibuffer-completion-table (internal-complete-buffer-except))) (read-buffer prompt (other-buffer (current-buffer)) (confirm-nonexistent-file-or-buffer)))) (defun helm--generic-read-buffer (prompt &optional default require-match predicate) "The `read-buffer-function' for `helm-mode'. Affects `switch-to-buffer' `kill-buffer' and related." (helm--completing-read-default prompt (or minibuffer-completion-table (internal-complete-buffer "" nil t)) predicate require-match nil nil default)) (cl-defun helm--completing-read-default (prompt collection &optional predicate require-match initial-input hist def inherit-input-method) "An helm replacement of `completing-read'. This function should be used only as a `completing-read-function'. Don't use it directly, use instead `helm-comp-read' in your programs. See documentation of `completing-read' and `all-completions' for details." (let* ((current-command (or (helm-this-command) this-command)) (str-command (helm-symbol-name current-command)) (buf-name (format "*helm-mode-%s*" str-command)) (entry (assq current-command helm-completing-read-handlers-alist)) (def-com (cdr-safe entry)) (str-defcom (and def-com (helm-symbol-name def-com))) (def-args (list prompt collection predicate require-match initial-input hist def inherit-input-method)) ;; Append the two extra args needed to set the buffer and source name ;; in helm specialized functions. (others-args (append def-args (list str-command buf-name))) helm-completion-mode-start-message ; Be quiet helm-completion-mode-quit-message ;; Be sure this pesty *completion* buffer doesn't popup. ;; Note: `minibuffer-with-setup-hook' may setup a lambda ;; calling `minibuffer-completion-help' or other minibuffer ;; functions we DONT WANT here, in these cases removing the hook ;; (a symbol) have no effect. Issue #448. ;; Because `minibuffer-completion-table' and ;; `minibuffer-completion-predicate' are not bound ;; anymore here, these functions should have no effect now, ;; except in some rare cases like in `woman-file-name', ;; so remove all incompatible functions ;; from `minibuffer-setup-hook' (Issue #1205, #1240). ;; otherwise helm have not the time to close its initial session. (minibuffer-setup-hook (cl-loop for h in minibuffer-setup-hook unless (or (consp h) ; a lambda. (byte-code-function-p h) (helm-subr-native-elisp-p h) (memq h helm-mode-minibuffer-setup-hook-black-list)) collect h)) ;; Disable hack that could be used before `completing-read'. ;; i.e (push ?\t unread-command-events). unread-command-events (default-handler ;; If nothing is found in ;; helm-completing-read-handlers-alist use default ;; handler. #'helm-completing-read-default-handler)) (when (eq def-com 'ido) (setq def-com 'ido-completing-read)) (unless (or (not entry) def-com) ;; An entry in *read-handlers-alist exists but have ;; a nil value, so we exit from here, disable `helm-mode' ;; and run the command again with it original behavior. ;; `helm-mode' will be restored on exit. (cl-return-from helm--completing-read-default (unwind-protect (progn (helm-mode -1) (apply completing-read-function def-args)) (helm-mode 1)))) ;; If we use now `completing-read' we MUST turn off `helm-mode' ;; to avoid infinite recursion and CRASH. It will be reenabled on exit. (when (or (eq def-com 'completing-read) ;; All specialized functions are prefixed by "helm" (and (stringp str-defcom) (not (string-match "^helm" str-defcom)))) (helm-mode -1)) (unwind-protect (cond (;; An helm specialized function exists, run it. (and def-com helm-mode) (apply def-com others-args)) (;; Try to handle `ido-completing-read' everywhere. (and def-com (eq def-com 'ido-completing-read)) (setcar (memq collection def-args) (all-completions "" collection predicate)) (apply def-com def-args)) (;; User set explicitely `completing-read' or something similar ;; in *read-handlers-alist, use this with exactly the same ;; args as in `completing-read'. ;; If we are here `helm-mode' is now disabled. def-com (apply def-com def-args)) (;; Use by default a in-buffer handler unless ;; COLLECTION is a function. t (funcall default-handler prompt collection predicate require-match initial-input hist def inherit-input-method str-command buf-name))) (helm-mode 1) ;; When exiting minibuffer, `this-command' is set to ;; `helm-exit-minibuffer', which is unwanted when starting ;; on another `completing-read', so restore `this-command' to ;; initial value when exiting. (setq this-command current-command)))) ;;; Generic read-file-name ;; ;; ;;;###autoload (cl-defun helm-read-file-name (prompt &key (name "Read File Name") (initial-input default-directory) (buffer "*Helm file completions*") test noret (case-fold helm-file-name-case-fold-search) preselect history must-match (fuzzy t) default marked-candidates (candidate-number-limit helm-ff-candidate-number-limit) nomark (alistp t) (persistent-action-if 'helm-find-files-persistent-action-if) (persistent-help "Hit1 Expand Candidate, Hit2 or (C-u) Find file") (mode-line helm-read-file-name-mode-line-string)) "Read a file name with helm completion. It is helm `read-file-name' emulation. Argument PROMPT is the default prompt to use. Keys description: - NAME: Source name, default to \"Read File Name\". - INITIAL-INPUT: Where to start reading file name, default to `default-directory'. - BUFFER: `helm-buffer' name, defaults to \"*Helm Completions*\". - TEST: A predicate called with one arg 'candidate'. - NORET: Allow disabling helm-ff-RET (have no effect if helm-ff-RET isn't bound to RET). - CASE-FOLD: Same as `helm-case-fold-search'. - PRESELECT: helm preselection. - HISTORY: Display HISTORY in a special source. - MUST-MATCH: Can be 'confirm, nil, or t. - FUZZY: Enable fuzzy matching when non-nil (Enabled by default). - MARKED-CANDIDATES: When non--nil return a list of marked candidates. - NOMARK: When non--nil don't allow marking candidates. - ALISTP: Don't use `all-completions' in history (take effect only on history). - PERSISTENT-ACTION-IF: a persistent if action function. - PERSISTENT-HELP: persistent help message. - MODE-LINE: A mode line message, default is `helm-read-file-name-mode-line-string'." (require 'tramp) (when (get-buffer helm-action-buffer) (kill-buffer helm-action-buffer)) (mapc (lambda (hook) (add-hook 'helm-after-update-hook hook)) '(helm-ff-move-to-first-real-candidate helm-ff-update-when-only-one-matched helm-ff-auto-expand-to-home-or-root)) (let* ((action-fn `(("Sole action (Identity)" . (lambda (candidate) (if ,marked-candidates (helm-marked-candidates :with-wildcard t) (identity candidate)))))) ;; Be sure we don't erase the underlying minibuffer if some. (helm-ff-auto-update-initial-value (and helm-ff-auto-update-initial-value (not (minibuffer-window-active-p (minibuffer-window))))) helm-follow-mode-persistent (helm-ff-fuzzy-matching (and fuzzy (not (memq helm-mm-matching-method '(multi1 multi3p))))) (hist (and history (helm-comp-read-get-candidates history nil nil alistp))) (helm-ff--RET-disabled noret) (minibuffer-completion-predicate test) (minibuffer-completing-file-name t) (helm--completing-file-name t) (helm-read-file-name-mode-line-string (replace-regexp-in-string "helm-maybe-exit-minibuffer" "helm-confirm-and-exit-minibuffer" helm-read-file-name-mode-line-string)) (src-list (list ;; History source. (helm-build-sync-source (format "%s History" name) :header-name (lambda (name) (concat name (substitute-command-keys helm-find-files-doc-header))) :mode-line mode-line :candidates hist :nohighlight t :fuzzy-match fuzzy :persistent-action-if persistent-action-if :persistent-help persistent-help :keymap helm-read-file-map :must-match must-match :nomark nomark :action action-fn) ;; Other source. (helm-build-sync-source name :header-name (lambda (name) (concat name (substitute-command-keys helm-find-files-doc-header))) :init (lambda () (setq helm-ff-auto-update-flag helm-ff-auto-update-initial-value) (setq helm-ff--auto-update-state helm-ff-auto-update-flag)) :mode-line mode-line :help-message 'helm-read-file-name-help-message :nohighlight t :candidates (lambda () (if test (append (and (not (file-exists-p helm-pattern)) (not (helm-ff--invalid-tramp-name-p helm-pattern)) (list (helm-ff-filter-candidate-one-by-one helm-pattern nil t))) (cl-loop with hn = (helm-ff--tramp-hostnames) ;; helm-find-files-get-candidates is ;; returning a list of cons cells. for (d . r) in (helm-find-files-get-candidates must-match) when (or (member r hn) ; A tramp host (funcall test r)) ; Test ok collect (cons d r))) (helm-find-files-get-candidates must-match))) :update (lambda () (remhash helm-ff-default-directory helm-ff--list-directory-cache)) :match-on-real t :filtered-candidate-transformer '(helm-ff-fct helm-ff-sort-candidates) :persistent-action-if persistent-action-if :persistent-help persistent-help :volatile t :keymap helm-read-file-map :must-match must-match :cleanup 'helm-find-files-cleanup :nomark nomark :action action-fn))) ;; Helm result. (result (helm :sources (if helm-mode-reverse-history (reverse src-list) src-list) :input (expand-file-name initial-input) :prompt prompt :candidate-number-limit candidate-number-limit :resume 'noresume :case-fold-search case-fold :default default :buffer buffer :full-frame nil :preselect preselect))) (or (cond ((and result (stringp result) (string= result "") "")) ((and result (stringp result) (file-equal-p result initial-input) default) (if (listp default) (car default) default)) ((and result (listp result)) (mapcar #'expand-file-name result)) ((and result (file-directory-p result)) (file-name-as-directory (expand-file-name result))) (result (expand-file-name result))) (helm-mode--keyboard-quit)))) (defun helm-mode--default-filename (fname dir initial) (unless dir (setq dir default-directory)) (unless (file-name-absolute-p dir) (setq dir (expand-file-name dir))) (unless (or fname (consp fname)) (setq fname (expand-file-name (or initial buffer-file-name dir) dir))) (if (and fname (consp fname)) (setq fname (cl-loop for f in fname collect (expand-file-name f dir))) (if (file-name-absolute-p fname) fname (expand-file-name fname dir)))) (cl-defun helm--generic-read-file-name (prompt &optional dir default-filename mustmatch initial predicate) "Generic helm replacement of `read-file-name'. Don't use it directly, use instead `helm-read-file-name' in your programs." (let* ((init (or initial dir default-directory)) (current-command (or (helm-this-command) this-command)) (str-command (helm-symbol-name current-command)) (helm--file-completion-sources (cons str-command (remove str-command helm--file-completion-sources))) (buf-name (format "*helm-mode-%s*" str-command)) (entry (assq current-command helm-completing-read-handlers-alist)) (def-com (cdr-safe entry)) (str-defcom (and def-com (helm-symbol-name def-com))) ;; Don't modify the original args list for emacs generic functions. (def-args (list prompt dir default-filename mustmatch initial predicate)) ;; Append the two extra args needed to set the buffer and source name ;; in helm specialized functions. (others-args (append def-args (list str-command buf-name))) (reading-directory (eq predicate 'file-directory-p)) (use-dialog (and (next-read-file-uses-dialog-p) ;; Graphical file dialogs can't handle ;; remote files. (not (file-remote-p init)) use-file-dialog)) helm-completion-mode-start-message ; Be quiet helm-completion-mode-quit-message ; Same here add-to-history fname) ;; Build `default-filename' with `dir'+`initial' when ;; `default-filename' is not specified. ;; See `read-file-name' docstring for more infos. (setq default-filename (helm-mode--default-filename default-filename dir initial)) ;; Some functions that normally call `completing-read' can switch ;; brutally to `read-file-name' (e.g find-tag), in this case ;; the helm specialized function will fail because it is build ;; for `completing-read', so set it to 'incompatible to be sure ;; we switch to `helm-read-file-name' and don't try to call it ;; with wrong number of args. (when (eq def-com 'ido) (setq def-com 'ido-read-file-name)) (when (and def-com (> (length (help-function-arglist def-com)) 8)) (setq def-com 'incompatible)) (unless (or (not entry) def-com) (cl-return-from helm--generic-read-file-name (unwind-protect (progn (helm-mode -1) (apply read-file-name-function def-args)) (helm-mode 1)))) ;; If we use now `read-file-name' or dialog we MUST turn off `helm-mode' ;; to avoid infinite recursion and CRASH. It will be reenabled on exit. (when (or (memq def-com '(read-file-name ido-read-file-name)) use-dialog (and (stringp str-defcom) (not (string-match "^helm" str-defcom)))) (helm-mode -1)) (unwind-protect (setq fname (cond (use-dialog (let ((dialog-mustmatch (not (memq mustmatch '(nil confirm confirm-after-completion))))) ;; Dialogs don't support a list of default fnames. (when (and default-filename (consp default-filename)) (setq default-filename (expand-file-name (car default-filename) init))) (setq add-to-history t) (x-file-dialog prompt init default-filename dialog-mustmatch reading-directory))) ;; A specialized function exists, run it ;; with the two extra args specific to helm. ;; Note that the helm handler should ensure ;; :initial-input is not nil i.e. Use init ;; which fallback to default-directory instead ;; of INITIAL. ((and def-com helm-mode (not (eq def-com 'ido-read-file-name)) (not (eq def-com 'incompatible))) (apply def-com others-args)) (;; Def-com value is `ido-read-file-name' ;; run it with default args. (and def-com (eq def-com 'ido-read-file-name)) (ido-mode 1) (apply def-com def-args)) (;; Def-com value is `read-file-name' ;; run it with default args. (eq def-com 'read-file-name) (apply def-com def-args)) (t ; Fall back to classic `helm-read-file-name'. (helm-read-file-name prompt :name str-command :buffer buf-name :default default-filename ;; Helm handlers should always have a non nil INITIAL arg. :initial-input (expand-file-name init dir) :alistp nil :must-match mustmatch :test predicate :noret reading-directory)))) (and ido-mode (ido-mode -1)) (helm-mode 1) ;; Same comment as in `helm--completing-read-default'. (setq this-command current-command)) (when add-to-history (add-to-history 'file-name-history (minibuffer-maybe-quote-filename fname))) (if (and ;; Using `read-directory-name'. reading-directory ;; `file-name-as-directory' return "./" when FNAME is ;; empty string. (not (string= fname ""))) (file-name-as-directory fname) fname))) ;; Read file name handler with history (issue #1652) (defun helm-read-file-name-handler-1 (prompt dir default-filename mustmatch initial predicate name buffer) "A `read-file-name' handler with history. Can be added to `helm-completing-read-handlers-alist' for functions that need a `read-file-name' function with directory history. The `helm-find-files' history `helm-ff-history' is used here." (let ((helm-always-two-windows t) (helm-split-window-default-side (if (eq helm-split-window-default-side 'same) 'below helm-split-window-default-side)) helm-split-window-inside-p helm-reuse-last-window-split-state ;; Helm handlers should always have a non nil INITIAL arg. (init (or initial dir default-directory))) (helm-read-file-name prompt :name name :history helm-ff-history :buffer buffer :default default-filename :initial-input (expand-file-name init dir) :alistp nil :must-match mustmatch :test predicate))) ;;; Completion in region and Helm style ;; (defun helm-mode--advice-lisp--local-variables (old--fn &rest args) (ignore-errors (apply old--fn args))) (defvar helm-completion--sorting-done nil "Flag that notifies the FCT if sorting has been done in completion function.") (defun helm-completion-in-region-sort-fn (candidates _source) "Default sort function for completion-in-region." (if helm-completion--sorting-done candidates (sort candidates 'helm-generic-sort-fn))) (defun helm-mode--completion-in-region-initial-input (str) "Highlight prefix in helm and helm-fuzzy `helm-completion-styles'." (if (memq helm-completion-style '(helm helm-fuzzy)) (propertize str 'read-only t 'face 'helm-mode-prefix 'rear-nonsticky t) str)) (defun helm-completion-in-region--initial-filter (comps afun file-comp-p) "Add annotations at end of candidates and filter out dot files." (if file-comp-p ;; Filter out dot files in file completion. (cl-loop for f in comps unless (string-match "\\`\\.\\{1,2\\}/\\'" f) collect f) (if afun ;; Add annotation at end of ;; candidate if needed, e.g. foo, this happen when ;; completing against a quoted symbol. (mapcar (lambda (s) (let ((ann (funcall afun s))) (if ann (cons (concat s (propertize " " 'display (propertize ann 'face 'completions-annotations))) s) s))) comps) comps))) ;; Helm multi matching style (defun helm-completion-try-completion (string table pred point) "The try completion function for `completing-styles-alist'. Actually does nothing." ;; AFAIU the try-completions style functions ;; are here to check if what is at point is suitable for TABLE but ;; there is no way to pass a multiple pattern from what is at point ;; apart sending STRING in a minibuffer like helm does. Perhaps ;; minibuffer-complete should benefit of this but for now just do ;; nothing as this is used nowhere. It is anyway not clear what the ;; try-completions functions do in emacs so just do nothing for now. (ignore string table pred point)) (defun helm-completion-all-completions (string table pred point) "The all completions function for `completing-styles-alist'." ;; FIXME: No need to bind all these value. (cl-multiple-value-bind (all _pattern prefix _suffix _carbounds) (helm-completion--multi-all-completions string table pred point) (when all (nconc all (length prefix))))) (defun helm-completion--multi-all-completions-1 (string collection &optional predicate) "Allow `all-completions' multi matching on its candidates." ;; Doing an initial call of all-completions on the first element of ;; STRING speedup completion and fix file completion when CAPF ;; returns relative paths to initial pattern (eshell and shell). (let* ((split (helm-mm-split-pattern string)) (fpat (or (car split) "")) (file-comp-p (or minibuffer-completing-file-name (eq (completion-metadata-get (completion-metadata string collection predicate) 'category) 'file))) (all (and file-comp-p (or (cdr split) (and (not (cdr split)) ;; Kickin when STRING is a simple string. ;; Handle as well "foo " (space at end). (not (string= fpat ""))) (string= string "")) (not (string-match "\\`!" fpat)) ;; all-completions should return nil if FPAT is a ;; regexp, it is what we expect. (all-completions fpat collection (lambda (x &optional _y) (let ((elm (if (listp x) (car x) x))) (funcall (or predicate #'identity) elm)))))) (pattern (helm-aand all (string-match " " string) ;; Returns the part of STRING after space ;; e.g. "foo bar baz" => "bar baz". (substring string (1+ it))))) (if (or (and all (not (cdr split))) (equal pattern "")) ; e.g. STRING == "foo ". all (all-completions "" (or all collection) (lambda (x &optional _y) ;; Second arg _y is needed when ;; COLLECTION is a hash-table issue ;; #2231 (C-x 8 RET). ;; Elements of COLLECTION may be ;; lists or alists, in this case consider the ;; car of element (issue #2219 org-refile). (let ((elm (if (listp x) (car x) x))) ;; PREDICATE have been already called in ;; initial all-completions, no need to call ;; it a second time, thus ALL is now a list ;; of strings maybe not supported by ;; PREDICATE (e.g. symbols vs strings). (if (and predicate (null all)) (and (funcall predicate elm) ;; ALL is nil so use whole STRING ;; against COLLECTION. (helm-mm-match (helm-stringify elm) string)) (helm-mm-match (helm-stringify elm) (or (and all pattern) string))))))))) (defun helm-completion--multi-all-completions (string table pred point) "Collect completions from TABLE for helm completion style." (let* ((beforepoint (substring string 0 point)) (afterpoint (substring string point)) (bounds (completion-boundaries beforepoint table pred afterpoint)) (prefix (substring beforepoint 0 (car bounds))) (suffix (substring afterpoint (cdr bounds))) (all (helm-completion--multi-all-completions-1 (regexp-quote string) table pred))) (list all string prefix suffix point))) ;; The adjust-metadata functions run only in emacs-27, they are NOT ;; used otherwise. (defun helm-completion--adjust-metadata (metadata) (if (memq helm-completion-style '(helm helm-fuzzy)) metadata (let ((compose-helm-sort-fn (lambda (candidates) (sort candidates #'helm-generic-sort-fn)))) `(metadata (display-sort-function . ,compose-helm-sort-fn) (cycle-sort-function . ,compose-helm-sort-fn) ,@(cdr metadata))))) (put 'helm 'completion--adjust-metadata 'helm-completion--adjust-metadata) ;; Helm-flex style. ;; This is more or less the same as emacs-27 flex style. (defun helm-flex-completion-try-completion (string table pred point) "The try completion function for `completing-styles-alist'." ;; It is needed here to make minibuffer-complete work in emacs-26, ;; e.g. with regular M-x. (unless (string-match-p " " string) (cl-multiple-value-bind (all pattern prefix suffix _carbounds) (helm-completion--flex-all-completions string table pred point) (when minibuffer-completing-file-name (setq all (completion-pcm--filename-try-filter all))) (completion-pcm--merge-try pattern all prefix suffix)))) (defun helm-flex-completion-all-completions (string table pred point) "The all completions function for `completing-styles-alist'." ;; FIXME: No need to bind all these value. (unless (string-match-p " " string) (cl-multiple-value-bind (all pattern prefix _suffix _carbounds) (helm-completion--flex-all-completions string table pred point #'helm-completion--flex-transform-pattern) (let ((regexp (completion-pcm--pattern->regex pattern 'group))) (when all (nconc (helm-flex-add-score-as-prop all regexp) (length prefix))))))) (defun helm-flex-add-score-as-prop (candidates regexp) (cl-loop with case-fold-search = (helm-set-case-fold-search) for cand in candidates collect (helm-flex--style-score cand regexp))) (defun helm-completion--flex-transform-pattern (pattern) ;; "fob" => '(prefix "f" any "o" any "b" any point) (cl-loop for p in pattern if (stringp p) nconc (cl-loop for str across p nconc (list (string str) 'any)) else nconc (list p))) ;; Same as emacs-27 completion-substring--all-completions. (defun helm-completion--flex-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 will 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)) (suffix (substring afterpoint (cdr bounds))) (prefix (substring beforepoint 0 (car bounds))) (basic-pattern (completion-basic--pattern beforepoint afterpoint bounds)) (pattern (if (not (stringp (car basic-pattern))) basic-pattern (cons 'prefix basic-pattern))) (pattern (if transform-pattern-fn (funcall transform-pattern-fn pattern) pattern)) (all (completion-pcm--all-completions prefix pattern table pred))) (list all pattern prefix suffix (car bounds)))) (defun helm-completion-in-region--selection () (with-helm-buffer (setq helm-saved-selection (helm-get-selection nil 'withprop)))) ;; Completion-in-region-function (defun helm--completion-in-region (origfun start end collection &optional predicate) "Helm replacement of `completion--in-region'. Can be used for `completion-in-region-function' by advicing it with an :around advice to allow passing the old `completion-in-region-function' value in ORIGFUN." (cl-declare (special require-match prompt)) (if (memq major-mode helm-mode-no-completion-in-region-in-modes) (funcall origfun start end collection predicate) (advice-add 'lisp--local-variables :around #'helm-mode--advice-lisp--local-variables) (let ((old--helm-completion-style helm-completion-style) (exit-fun (plist-get completion-extra-properties :exit-function)) ;; Always start with prefix to allow completing without ;; the need of inserting a space after cursor or ;; relaying on crap old completion-styles emacs22 which ;; add suffix after prefix. e.g. def|else. (initial-input (buffer-substring-no-properties start (point))) string) (helm-aif (cdr (assq major-mode helm-completion-styles-alist)) (customize-set-variable 'helm-completion-style (if (cdr-safe it) (car it) it))) ;; This hook force usage of the display part of candidate with ;; its properties, this is needed for lsp-mode in its ;; :exit-function see issue #2265. (add-hook 'helm-before-action-hook 'helm-completion-in-region--selection) (unwind-protect (let* ((enable-recursive-minibuffers t) (completion-flex-nospace t) (completion-styles (helm--prepare-completion-styles)) (input (buffer-substring-no-properties start end)) (prefix (and (eq helm-completion-style 'emacs) initial-input)) (point (point)) (current-command (or (helm-this-command) this-command ;; Some backends are async and ;; use a callback, in those ;; cases, we can't retrieve from ;; frames the last interactive ;; command, so fallback to ;; `last-command' which may be ;; the one that called the callback. last-command)) (crm (eq current-command 'crm-complete)) (str-command (helm-symbol-name current-command)) (buf-name (format "*helm-mode-%s*" str-command)) (require-match (or (and (boundp 'require-match) require-match) minibuffer-completion-confirm ;; If prompt have not been propagated here, that's ;; probably mean we have no prompt and we are in ;; completion-at-point or friend, so use a non--nil ;; value for require-match. (not (boundp 'prompt)))) (metadata (completion-metadata input collection predicate)) ;; `completion-extra-properties' is let-bounded in `completion-at-point'. ;; `afun' is a closure to call against each string in `data'. ;; it provide the annotation info for each string. ;; e.g "foo" => "foo " where foo is a function. ;; See Issue #407. (afun (or (plist-get completion-extra-properties :annotation-function) (completion-metadata-get metadata 'annotation-function))) (init-space-suffix (unless (or (memq helm-completion-style '(helm-fuzzy emacs)) (string-suffix-p " " input) (string= input "")) " ")) (file-comp-p (or (eq (completion-metadata-get metadata 'category) 'file) (helm-mode--in-file-completion-p) ;; Assume that when `afun' and `predicate' are null ;; we are in filename completion. (and (null afun) (null predicate)))) ;; `completion-all-completions' store the base-size in the last `cdr', ;; so data looks like this: '(a b c d . 0) and (last data) == (d . 0). base-size (compfn (lambda (str _predicate _action) (let* ((completion-ignore-case (helm-set-case-fold-search)) (comps (completion-all-completions str ; This is helm-pattern collection predicate ;; Use prefix length at first call to ;; allow styles matching ;; "prefix*suffix" to kick in. (length (or prefix str)) metadata)) (last-data (last comps)) (bs (helm-aif (cdr last-data) (prog1 it ;; Remove the last element of ;; comps by side-effect. (setcdr last-data nil)) 0)) ;; Helm syle sort fn is added to ;; metadata only in emacs-27, so in ;; emacs-26 use helm-generic-sort-fn ;; which handle both helm and ;; helm-flex styles. When ;; helm-completion-style is helm or ;; helm-fuzzy, sorting will be done ;; later in FCT. (sort-fn (and (eq helm-completion-style 'emacs) (or ;; Emacs-27 (completion-metadata-get metadata 'display-sort-function) ;; Emacs-26 (lambda (candidates) (sort candidates #'helm-generic-sort-fn))))) all) ;; Reset prefix to allow using length of ;; helm-pattern on next calls (this avoid ;; args-out-of-range error). (and prefix (setq prefix nil)) ;; base-size needs to be set only once at ;; first call. (unless base-size (setq base-size bs)) (setq helm-completion--sorting-done (and sort-fn t)) (setq all (copy-sequence comps)) (helm-completion-in-region--initial-filter (if (and sort-fn (> (length str) 0)) (funcall sort-fn all) all) afun file-comp-p)))) (data (if (memq helm-completion-style '(helm helm-fuzzy)) (funcall compfn input nil nil) compfn)) (result (if (stringp data) data (helm-comp-read ;; Completion-at-point and friends have no prompt. (or (and (boundp 'prompt) prompt) "Pattern: ") data :name str-command :nomark (null crm) :marked-candidates crm :initial-input (cond ((and file-comp-p (not (string-match "/\\'" initial-input))) (concat (helm-mode--completion-in-region-initial-input (if (memq helm-completion-style '(helm helm-fuzzy)) (helm-basename initial-input) initial-input)) init-space-suffix)) ((string-match "/\\'" initial-input) (and (eq helm-completion-style 'emacs) initial-input)) ((or (null require-match) (stringp require-match)) (helm-mode--completion-in-region-initial-input initial-input)) (t (concat (helm-mode--completion-in-region-initial-input initial-input) init-space-suffix))) :buffer buf-name :fc-transformer ;; Ensure sort fn is at the end. (append '(helm-cr-default-transformer) (and helm-completion-in-region-default-sort-fn (list helm-completion-in-region-default-sort-fn))) :match-dynamic (eq helm-completion-style 'emacs) :fuzzy (eq helm-completion-style 'helm-fuzzy) :exec-when-only-one t :quit-when-no-cand (lambda () ;; Delay message to overwrite "Quit". (run-with-timer 0.01 nil (lambda () (message "[No matches]"))) t) ; exit minibuffer immediately. :must-match require-match)))) ;; `helm-completion-in-region--insert-result' is stripping ;; out properties on RESULT by side-effect (perhaps ;; `choose-completion-string'?) so make a copy of STRING ;; to not loose props. (setq string (copy-sequence result)) (helm-completion-in-region--insert-result result start point end base-size)) ;; Allow running extra property `:exit-function' (Issues #2265, ;; #2356). Function is called with 'exact if for a unique ;; match which is exact, the return value of `try-completion' ;; is t, otherwise it is called with 'finished. (when (and (stringp string) exit-fun) (funcall exit-fun string (if (eq (try-completion initial-input collection) t) 'exact 'finished))) (remove-hook 'helm-before-action-hook 'helm-completion-in-region--selection) (customize-set-variable 'helm-completion-style old--helm-completion-style) (setq helm-completion--sorting-done nil) (advice-remove 'lisp--local-variables #'helm-mode--advice-lisp--local-variables))))) (defvar helm-crm-default-separator "," "Default separator for `completing-read-multiple'. `crm-separator' will take precedence on this when it is a string composed of a single character. If used globally, it is a string composed of a single character, if let-bounded, it can be also nil or a symbol which mean no separator. Don't set this to a string composed of more than one character. Be sure to know what you are doing when modifying this.") (defun helm-completion-in-region--insert-result (result start point end base-size) (cond ((stringp result) ;; When RESULT have annotation, annotation is displayed ;; in it with a display property attached to a space ;; added at end of string, take care of removing this ;; space (issue #2360). However keep RESULT intact to ;; pass it to `:exit-function' i.e. Don't store the ;; modified string in STRING. (choose-completion-string (replace-regexp-in-string " \\'" "" result) (current-buffer) (list (+ start base-size) point) completion-list-insert-choice-function) (when helm-completion-mark-suffix (run-with-idle-timer 0.01 nil (lambda () (helm-aand (+ (- (point) point) end) (and (> it (point)) it) (push-mark it t t)))))) ((consp result) ; crm. (let ((beg (+ start base-size)) (sep (or (and ;; If `crm-separator' is a string of length 1 ;; assume it can be used as separator (#2298), ;; otherwise it is a regexp and use the value ;; it matches or default to "," if no match. (eq (length crm-separator) 1) crm-separator) helm-crm-default-separator))) ;; Try to find a default separator. If `crm-separator' is a ;; regexp use the string the regexp is matching. ;; If SEP is not a string, it have been probably bound to a ;; symbol or nil through `helm-crm-default-separator' that serve ;; as a flag to say "Please no separator" (Issue #2353 with ;; `magit-completing-read-multiple'). (if (stringp sep) (save-excursion (goto-char beg) (when (looking-back crm-separator (1- (point))) (setq sep (match-string 0)))) (setq sep nil)) (funcall completion-list-insert-choice-function beg end (mapconcat 'identity (append result '("")) sep)))) (t nil))) (defun helm-mode--in-file-completion-p () (with-helm-current-buffer (run-hook-with-args-until-success 'file-name-at-point-functions))) (defun helm-mode--disable-ido-maybe (&optional from-hook) (when (and (boundp 'ido-everywhere) ido-everywhere) (remove-function read-file-name-function #'ido-read-file-name) (remove-function read-buffer-function #'ido-read-buffer) (setq ido-everywhere nil) (if from-hook (user-error "Unable to turn on Ido-everywhere while Helm-mode is enabled") (user-error "Helm-mode enabled (Ido-everywhere is incompatible with Helm-mode, disabling it)")))) (defun helm-mode--ido-everywhere-hook () ;; Called only when user calls directly ido-everywhere ;; and helm-mode is enabled. (when helm-mode (helm-mode--disable-ido-maybe t))) ;;;###autoload (define-minor-mode helm-mode "Toggle generic helm completion. All functions in Emacs that use `completing-read', `read-file-name', `completion-in-region' and friends will use helm interface when this mode is turned on. However you can modify this behavior for functions of your choice with `helm-completing-read-handlers-alist'. Called with a positive arg, turn on unconditionally, with a negative arg turn off. You can toggle it with M-x `helm-mode'. About `ido-mode': DO NOT enable `ido-everywhere' when using `helm-mode'. Instead of using `ido-mode', add the commands where you want to use ido to `helm-completing-read-handlers-alist' with `ido' as value. Note: This mode is incompatible with Emacs23." :group 'helm-mode :global t :lighter helm-completion-mode-string (cl-assert (boundp 'completing-read-function) nil "`helm-mode' not available, upgrade to Emacs-24") (if helm-mode (progn (add-function :override completing-read-function #'helm--completing-read-default) (add-function :override read-file-name-function #'helm--generic-read-file-name) (add-function :override read-buffer-function #'helm--generic-read-buffer) (when helm-mode-handle-completion-in-region (add-function :around completion-in-region-function #'helm--completion-in-region)) ;; If user have enabled ido-everywhere BEFORE enabling ;; helm-mode disable it and warn user about its ;; incompatibility with helm-mode (issue #2085). (helm-mode--disable-ido-maybe) ;; If ido-everywhere is not enabled yet anticipate and ;; disable it if user attempt to enable it while helm-mode ;; is running (issue #2085). (add-hook 'ido-everywhere-hook #'helm-mode--ido-everywhere-hook) (when (fboundp 'ffap-read-file-or-url-internal) ;; `ffap-read-file-or-url-internal' have been removed in ;; emacs-27 and `ffap-read-file-or-url' is fixed, so no need ;; to advice it. (advice-add 'ffap-read-file-or-url :override #'helm-advice--ffap-read-file-or-url)) (advice-add 'read-buffer-to-switch :override #'helm-mode--read-buffer-to-switch)) (progn (remove-function completing-read-function #'helm--completing-read-default) (remove-function read-file-name-function #'helm--generic-read-file-name) (remove-function read-buffer-function #'helm--generic-read-buffer) (remove-function completion-in-region-function #'helm--completion-in-region) (remove-hook 'ido-everywhere-hook #'helm-mode--ido-everywhere-hook) (when (fboundp 'ffap-read-file-or-url-internal) (advice-remove 'ffap-read-file-or-url #'helm-advice--ffap-read-file-or-url)) (advice-remove 'read-buffer-to-switch #'helm-mode--read-buffer-to-switch)))) (provide 'helm-mode) ;; Local Variables: ;; byte-compile-warnings: (not obsolete) ;; coding: utf-8 ;; indent-tabs-mode: nil ;; End: ;;; helm-mode.el ends here