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helm-lib.el
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helm-lib.el
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;;; helm-lib.el --- Helm routines. -*- lexical-binding: t -*-
;; Copyright (C) 2015 ~ 2020 Thierry Volpiatto <thierry.volpiatto@gmail.com>
;; Author: Thierry Volpiatto <thierry.volpiatto@gmail.com>
;; URL: http://github.com/emacs-helm/helm
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; All helm functions that don't require specific helm code should go here.
;;; Code:
(require 'cl-lib)
(declare-function ansi-color--find-face "ansi-color.el")
(declare-function ansi-color-apply-sequence "ansi-color.el")
(declare-function dired-current-directory "dired.el")
(declare-function dired-log-summary "dired.el")
(declare-function dired-mark-remembered "dired.el")
(declare-function ffap-file-remote-p "ffap.el")
(declare-function ffap-url-p "ffap.el")
(declare-function helm-get-attr "helm.el")
(declare-function helm-set-attr "helm.el")
(declare-function helm-follow-mode-p "helm.el")
(declare-function helm-get-current-source "helm.el")
(declare-function helm-get-selection "helm.el")
(declare-function helm-get-sources "helm.el")
(declare-function helm-interpret-value "helm.el")
(declare-function helm-log-run-hook "helm.el")
(declare-function helm-marked-candidates "helm.el")
(declare-function helm-set-case-fold-search "helm.el")
(declare-function helm-source--cl--print-table "helm-source.el")
(declare-function helm-update "helm.el")
(declare-function org-content "org.el")
(declare-function org-mark-ring-goto "org.el")
(declare-function org-mark-ring-push "org.el")
(declare-function org-table-p "org-compat.el")
(declare-function org-table-align "org-table.el")
(declare-function org-table-end "org-table.el")
(declare-function org-open-at-point "org.el")
(declare-function wdired-change-to-dired-mode "wdired.el")
(declare-function wdired-do-perm-changes "wdired.el")
(declare-function wdired-do-renames "wdired.el")
(declare-function wdired-do-symlink-changes "wdired.el")
(declare-function wdired-flag-for-deletion "wdired.el")
(declare-function wdired-get-filename "wdired.el")
(declare-function wdired-normalize-filename "wdired.el")
(defvar helm-sources)
(defvar helm-initial-frame)
(defvar helm-current-position)
(defvar wdired-old-marks)
(defvar wdired-keep-marker-rename)
(defvar wdired-allow-to-change-permissions)
(defvar wdired-allow-to-redirect-links)
(defvar helm-persistent-action-display-window)
(defvar helm--buffer-in-new-frame-p)
(defvar helm-completion-style)
(defvar helm-completion-styles-alist)
(defvar helm-persistent-action-window-buffer)
(defvar completion-flex-nospace)
;;; User vars.
;;
(defcustom helm-file-globstar t
"Same as globstar bash shopt option.
When non-nil a pattern beginning with two stars will expand
recursively.
Directories expansion is not supported yet."
:group 'helm
:type 'boolean)
(defcustom helm-yank-text-at-point-function nil
"The function used to forward point with `helm-yank-text-at-point'.
With a nil value, fallback to default `forward-word'.
The function should take one arg, an integer like `forward-word'.
NOTE: Using `forward-symbol' here is not very useful as it is
already provided by \\<helm-map>\\[next-history-element]."
:type 'function
:group 'helm)
(defcustom helm-scroll-amount nil
"Scroll amount when scrolling other window in a helm session.
It is used by `helm-scroll-other-window'
and `helm-scroll-other-window-down'.
If you prefer scrolling line by line, set this value to 1."
:group 'helm
:type 'integer)
(defcustom helm-help-full-frame t
"Display help window in full frame when non nil.
Even when nil probably the same result (full frame) can be
reached by tweaking `display-buffer-alist', but it is much more
convenient to use a simple boolean value here."
:type 'boolean
:group 'helm-help)
(defvar helm-ff--boring-regexp nil)
(defun helm-ff--setup-boring-regex (var val)
(set var val)
(setq helm-ff--boring-regexp
(cl-loop with last = (car (last val))
for r in (butlast val)
if (string-match "\\$\\'" r)
concat (concat r "\\|") into result
else concat (concat r "$\\|") into result
finally return
(concat result last
(if (string-match "\\$\\'" last) "" "$")))))
(defcustom helm-boring-file-regexp-list
(mapcar (lambda (f)
(let ((rgx (regexp-quote f)))
(if (string-match-p "[^/]$" f)
;; files: e.g .o => \\.o$
(concat rgx "$")
;; directories: e.g .git/ => \.git\\(/\\|$\\)
(concat (substring rgx 0 -1) "\\(/\\|$\\)"))))
completion-ignored-extensions)
"A list of regexps matching boring files.
This list is build by default on `completion-ignored-extensions'.
The directory names should end with \"/?\" e.g. \"\\.git/?\" and
the file names should end with \"$\" e.g. \"\\.o$\".
These regexps may be used to match the entire path, not just the
file name, so for example to ignore files with a prefix
\".bak.\", use \"\\.bak\\..*$\" as the regexp.
NOTE: When modifying this, be sure to use customize interface or
the customize functions e.g. `customize-set-variable' and NOT
`setq'."
:group 'helm-files
:type '(repeat (choice regexp))
:set 'helm-ff--setup-boring-regex)
(defcustom helm-describe-function-function 'describe-function
"Function used to describe functions in Helm."
:group 'helm-elisp
:type 'function)
(defcustom helm-describe-variable-function 'describe-variable
"Function used to describe variables in Helm."
:group 'helm-elisp
:type 'function)
;;; Internal vars
;;
(defvar helm-yank-point nil)
(defvar helm-pattern ""
"The input pattern used to update the helm buffer.")
(defvar helm-buffer "*helm*"
"Buffer showing completions.")
(defvar helm-current-buffer nil
"Current buffer when `helm' is invoked.")
(defvar helm-suspend-update-flag nil)
(defvar helm-action-buffer "*helm action*"
"Buffer showing actions.")
;;; Compatibility
;;
(defun helm-add-face-text-properties (beg end face &optional append object)
"Add the face property to the text from START to END.
It is a compatibility function which behaves exactly like
`add-face-text-property' if available, otherwise like
`add-text-properties'. When only `add-text-properties' is
available APPEND is ignored."
(if (fboundp 'add-face-text-property)
(add-face-text-property beg end face append object)
(add-text-properties beg end `(face ,face) object)))
;; Override `wdired-finish-edit'.
;; Fix emacs bug in `wdired-finish-edit' where
;; Wdired is not handling the case where `dired-directory' is a cons
;; cell instead of a string.
(defun helm--advice-wdired-finish-edit ()
(interactive)
(wdired-change-to-dired-mode)
(let ((changes nil)
(errors 0)
files-deleted
files-renamed
some-file-names-unchanged
file-old file-new tmp-value)
(save-excursion
(when (and wdired-allow-to-redirect-links
(fboundp 'make-symbolic-link))
(setq tmp-value (wdired-do-symlink-changes))
(setq errors (cdr tmp-value))
(setq changes (car tmp-value)))
(when (and wdired-allow-to-change-permissions
(boundp 'wdired-col-perm)) ; could have been changed
(setq tmp-value (wdired-do-perm-changes))
(setq errors (+ errors (cdr tmp-value)))
(setq changes (or changes (car tmp-value))))
(goto-char (point-max))
(while (not (bobp))
(setq file-old (wdired-get-filename nil t))
(when file-old
(setq file-new (wdired-get-filename))
(if (equal file-new file-old)
(setq some-file-names-unchanged t)
(setq changes t)
(if (not file-new) ;empty filename!
(push file-old files-deleted)
(when wdired-keep-marker-rename
(let ((mark (cond ((integerp wdired-keep-marker-rename)
wdired-keep-marker-rename)
(wdired-keep-marker-rename
(cdr (assoc file-old wdired-old-marks)))
(t nil))))
(when mark
(push (cons (substitute-in-file-name file-new) mark)
wdired-old-marks))))
(push (cons file-old (substitute-in-file-name file-new))
files-renamed))))
(forward-line -1)))
(when files-renamed
(setq errors (+ errors (wdired-do-renames files-renamed))))
(if changes
(progn
;; If we are displaying a single file (rather than the
;; contents of a directory), change dired-directory if that
;; file was renamed. (This ought to be generalized to
;; handle the multiple files case, but that's less trivial)
;; fixit [1].
(cond ((and (stringp dired-directory)
(not (file-directory-p dired-directory))
(null some-file-names-unchanged)
(= (length files-renamed) 1))
(setq dired-directory (cdr (car files-renamed))))
;; Fix [1] i.e dired buffers created with
;; (dired '(foo f1 f2 f3)).
((and (consp dired-directory)
(cdr dired-directory)
files-renamed)
(setcdr dired-directory
;; Replace in `dired-directory' files that have
;; been modified with their new name keeping
;; the ones that are unmodified at the same place.
(cl-loop with old-to-rename = (mapcar 'car files-renamed)
for f in (cdr dired-directory)
if (member f old-to-rename)
collect (assoc-default f files-renamed)
else collect f))))
;; Re-sort the buffer if all went well.
(unless (> errors 0) (revert-buffer))
(let ((inhibit-read-only t))
(dired-mark-remembered wdired-old-marks)))
(let ((inhibit-read-only t))
(remove-text-properties (point-min) (point-max)
'(old-name nil end-name nil old-link nil
end-link nil end-perm nil
old-perm nil perm-changed nil))
(message "(No changes to be performed)")))
(when files-deleted
(wdired-flag-for-deletion files-deleted))
(when (> errors 0)
(dired-log-summary (format "%d rename actions failed" errors) nil)))
(set-buffer-modified-p nil)
(setq buffer-undo-list nil))
;; Override `wdired-get-filename'.
;; Fix emacs bug in `wdired-get-filename' which returns the current
;; directory concatened with the filename i.e
;; "/home/you//home/you/foo" when filename is absolute in dired
;; buffer.
;; In consequence Wdired try to rename files even when buffer have
;; been modified and corrected, e.g delete one char and replace it so
;; that no change to file is done.
;; This also lead to ask confirmation for every files even when not
;; modified and when `wdired-use-interactive-rename' is nil.
(defun helm--advice-wdired-get-filename (&optional no-dir old)
;; FIXME: Use dired-get-filename's new properties.
(let (beg end file)
(save-excursion
(setq end (line-end-position))
(beginning-of-line)
(setq beg (next-single-property-change (point) 'old-name nil end))
(unless (eq beg end)
(if old
(setq file (get-text-property beg 'old-name))
;; In the following form changed `(1+ beg)' to `beg' so that
;; the filename end is found even when the filename is empty.
;; Fixes error and spurious newlines when marking files for
;; deletion.
(setq end (next-single-property-change beg 'end-name))
(setq file (buffer-substring-no-properties (1+ beg) end)))
;; Don't unquote the old name, it wasn't quoted in the first place
(and file (setq file (condition-case _err
;; emacs-25+
(apply #'wdired-normalize-filename
(list file (not old)))
(wrong-number-of-arguments
;; emacs-24
(wdired-normalize-filename file))))))
(if (or no-dir old (and file (file-name-absolute-p file)))
file
(and file (> (length file) 0)
(expand-file-name file (dired-current-directory)))))))
;;; Override `push-mark'
;;
;; Fix duplicates in `mark-ring' and `global-mark-ring' and update
;; buffers in `global-mark-ring' to recentest mark.
(defun helm--advice-push-mark (&optional location nomsg activate)
(unless (null (mark t))
(let ((marker (copy-marker (mark-marker))))
(setq mark-ring (cons marker (delete marker mark-ring))))
(when (> (length mark-ring) mark-ring-max)
;; Move marker to nowhere.
(set-marker (car (nthcdr mark-ring-max mark-ring)) nil)
(setcdr (nthcdr (1- mark-ring-max) mark-ring) nil)))
(set-marker (mark-marker) (or location (point)) (current-buffer))
;; Now push the mark on the global mark ring.
(setq global-mark-ring (cons (copy-marker (mark-marker))
;; Avoid having multiple entries
;; for same buffer in `global-mark-ring'.
(cl-loop with mb = (current-buffer)
for m in global-mark-ring
for nmb = (marker-buffer m)
unless (eq mb nmb)
collect m)))
(when (> (length global-mark-ring) global-mark-ring-max)
(set-marker (car (nthcdr global-mark-ring-max global-mark-ring)) nil)
(setcdr (nthcdr (1- global-mark-ring-max) global-mark-ring) nil))
(or nomsg executing-kbd-macro (> (minibuffer-depth) 0)
(message "Mark set"))
(when (or activate (not transient-mark-mode))
(set-mark (mark t)))
nil)
(defcustom helm-advice-push-mark t
"Override `push-mark' with a version avoiding duplicates when non-nil."
:group 'helm
:type 'boolean
:set (lambda (var val)
(set var val)
(if val
(advice-add 'push-mark :override #'helm--advice-push-mark '((depth . 100)))
(advice-remove 'push-mark #'helm--advice-push-mark))))
;; This the version of Emacs-27 written by Stefan
(defun helm-advice--ffap-read-file-or-url (prompt guess)
(or guess (setq guess default-directory))
(if (ffap-url-p guess)
(read-string prompt guess nil nil t)
(unless (ffap-file-remote-p guess)
(setq guess (abbreviate-file-name (expand-file-name guess))))
(read-file-name prompt (file-name-directory guess) nil nil
(file-name-nondirectory guess))))
;; The native-comp branch of emacs "is a modified Emacs capable of compiling
;; and running Emacs Lisp as native code in form of re-loadable elf files."
;; (https://akrl.sdf.org/gccemacs.html). The function subr-native-elisp-p is a
;; native function available only in this branch and evaluates to true if the
;; argument supplied is a natively compiled lisp function. Use this function
;; if it's available, otherwise return nil. Helm needs to distinguish compiled
;; functions from other symbols in a various places.
(defun helm-subr-native-elisp-p (object)
(when (fboundp 'subr-native-elisp-p)
(subr-native-elisp-p object)))
;;; Macros helper.
;;
(defmacro helm-with-gensyms (symbols &rest body)
"Bind the SYMBOLS to fresh uninterned symbols and eval BODY."
(declare (indent 1))
`(let ,(mapcar (lambda (s)
;; Use cl-gensym here instead of make-symbol
;; to ensure a symbol that have a live that go
;; beyond the live of its macro have different name.
;; i.e symbols created with `with-helm-temp-hook'
;; should have random names.
`(,s (cl-gensym (symbol-name ',s))))
symbols)
,@body))
;;; Command loop helper
;;
(defun helm-this-command ()
"Return the actual command in action.
Like `this-command' but return the real command, and not
`exit-minibuffer' or other unwanted functions."
(cl-loop with bl = '(helm-maybe-exit-minibuffer
helm-confirm-and-exit-minibuffer
helm-exit-minibuffer
exit-minibuffer)
for count from 1 to 50
for btf = (backtrace-frame count)
for fn = (cl-second btf)
if (and
;; In some case we may have in the way an
;; advice compiled resulting in byte-code,
;; ignore it (Bug#691).
(symbolp fn)
(commandp fn)
(not (memq fn bl)))
return fn
else
if (and (eq fn 'call-interactively)
(> (length btf) 2))
return (cadr (cdr btf))))
;;; Iterators
;;
(cl-defmacro helm-position (item seq &key test all)
"A simple and faster replacement of CL `position'.
Returns ITEM first occurence position found in SEQ.
When SEQ is a string, ITEM have to be specified as a char.
Argument TEST when unspecified default to `eq'.
When argument ALL is non-nil return a list of all ITEM positions
found in SEQ."
(let ((key (if (stringp seq) 'across 'in)))
`(cl-loop with deftest = 'eq
for c ,key ,seq
for index from 0
when (funcall (or ,test deftest) c ,item)
if ,all collect index into ls
else return index
finally return ls)))
(defun helm-iter-list (seq)
"Return an iterator object from SEQ."
(let ((lis seq))
(lambda ()
(let ((elm (car lis)))
(setq lis (cdr lis))
elm))))
(defun helm-iter-circular (seq)
"Infinite iteration on SEQ."
(let ((lis seq))
(lambda ()
(let ((elm (car lis)))
(setq lis (pcase lis (`(,_ . ,ll) (or ll seq))))
elm))))
(cl-defun helm-iter-sub-next-circular (seq elm &key (test 'eq))
"Infinite iteration of SEQ starting at ELM."
(let* ((pos (1+ (helm-position elm seq :test test)))
(sub (append (nthcdr pos seq) (cl-subseq seq 0 pos)))
(iterator (helm-iter-circular sub)))
(lambda ()
(helm-iter-next iterator))))
(defun helm-iter-next (iterator)
"Return next elm of ITERATOR."
(and iterator (funcall iterator)))
;;; Anaphoric macros.
;;
(defmacro helm-aif (test-form then-form &rest else-forms)
"Anaphoric version of `if'.
Like `if' but set the result of TEST-FORM in a temporary variable
called `it'. THEN-FORM and ELSE-FORMS are then executed just like
in `if'."
(declare (indent 2) (debug t))
`(let ((it ,test-form))
(if it ,then-form ,@else-forms)))
(defmacro helm-awhile (sexp &rest body)
"Anaphoric version of `while'.
Same usage as `while' except that SEXP is bound to a temporary
variable called `it' at each turn.
An implicit nil block is bound to the loop so usage of
`cl-return' is possible to exit the loop."
(declare (indent 1) (debug t))
(helm-with-gensyms (flag)
`(let ((,flag t))
(cl-block nil
(while ,flag
(helm-aif ,sexp
(progn ,@body)
(setq ,flag nil)))))))
(defmacro helm-acond (&rest clauses)
"Anaphoric version of `cond'.
In each clause of CLAUSES, the result of the car of clause is
stored in a temporary variable called `it' and usable in the cdr
of this same clause. Each `it' variable is independent of its
clause. The usage is the same as `cond'."
(declare (debug cond))
(unless (null clauses)
(helm-with-gensyms (sym)
(let ((clause1 (car clauses)))
`(let ((,sym ,(car clause1)))
(helm-aif ,sym
(if (cdr ',clause1)
(progn ,@(cdr clause1))
it)
(helm-acond ,@(cdr clauses))))))))
(defmacro helm-aand (&rest conditions)
"Anaphoric version of `and'.
Each condition is bound to a temporary variable called `it' which
is usable in next condition."
(declare (debug (&rest form)))
(cond ((null conditions) t)
((null (cdr conditions)) (car conditions))
(t `(helm-aif ,(car conditions)
(helm-aand ,@(cdr conditions))))))
(defmacro helm-acase (expr &rest clauses)
"A simple anaphoric `cl-case' implementation handling strings.
EXPR is bound to a temporary variable called `it' which is usable
in CLAUSES to refer to EXPR.
NOTE: Duplicate keys in CLAUSES are deliberately not handled.
\(fn EXPR (KEYLIST BODY...)...)"
(declare (indent 1) (debug (form &rest (sexp body))))
(unless (null clauses)
(let ((clause1 (car clauses)))
`(let ((key ',(car clause1))
(it ,expr))
(if (or (equal it key)
(and (listp key) (member it key))
(eq key t))
(progn ,@(cdr clause1))
(helm-acase it ,@(cdr clauses)))))))
;;; Fuzzy matching routines
;;
(defsubst helm--mapconcat-pattern (pattern)
"Transform string PATTERN in regexp for further fuzzy matching.
E.g.: helm.el$
=> \"[^h]*h[^e]*e[^l]*l[^m]*m[^.]*[.][^e]*e[^l]*l$\"
^helm.el$
=> \"helm[.]el$\"."
(let ((ls (split-string-and-unquote pattern "")))
(if (string= "^" (car ls))
;; Exact match.
(mapconcat (lambda (c)
(if (and (string= c "$")
(string-match "$\\'" pattern))
c (regexp-quote c)))
(cdr ls) "")
;; Fuzzy match.
(mapconcat (lambda (c)
(if (and (string= c "$")
(string-match "$\\'" pattern))
c (format "[^%s]*%s" c (regexp-quote c))))
ls ""))))
(defsubst helm--collect-pairs-in-string (string)
(cl-loop for str on (split-string string "" t) by 'cdr
when (cdr str)
collect (list (car str) (cadr str))))
;;; Help routines.
;;
(defvar helm-help--iter-org-state nil)
(defvar helm-help-mode-before-hook nil
"A hook that runs before helm-help starts.")
(defvar helm-help-mode-after-hook nil
"A hook that runs when helm-help exits.")
(defcustom helm-help-default-prompt
"[SPC,C-v,next:ScrollUp b,M-v,prior:ScrollDown TAB:Cycle M-TAB:All C-s/r:Isearch q:Quit]"
"The prompt used in `helm-help'."
:type 'string
:group 'helm)
(defcustom helm-help-hkmap
'(("C-v" . helm-help-scroll-up)
("SPC" . helm-help-scroll-up)
("<next>" . helm-help-scroll-up)
("M-v" . helm-help-scroll-down)
("b" . helm-help-scroll-down)
("<prior>" . helm-help-scroll-down)
("C-s" . isearch-forward)
("C-r" . isearch-backward)
("C-a" . move-beginning-of-line)
("C-e" . move-end-of-line)
("C-f" . forward-char)
("<right>" . forward-char)
("C-b" . backward-char)
("<left>" . backward-char)
("C-n" . helm-help-next-line)
("C-p" . helm-help-previous-line)
("<down>" . helm-help-next-line)
("<up>" . helm-help-previous-line)
("M-a" . backward-sentence)
("M-e" . forward-sentence)
("M-f" . forward-word)
("M-b" . backward-word)
("M->" . end-of-buffer)
("M-<" . beginning-of-buffer)
("C-SPC" . helm-help-toggle-mark)
("C-M-SPC" . mark-sexp)
("TAB" . org-cycle)
("C-m" . helm-help-org-open-at-point)
("C-&" . helm-help-org-mark-ring-goto)
("C-%" . org-mark-ring-push)
("M-TAB" . helm-help-org-cycle)
("M-w" . helm-help-copy-region-as-kill)
("q" . helm-help-quit))
"Alist of (KEY . FUNCTION) for `helm-help'.
This is not a standard keymap, just an alist where it is possible to
define a simple KEY (a string with no spaces) associated with a
FUNCTION. More complex key like \"C-x C-x\" are not supported.
Interactive functions will be called interactively whereas other
functions will be called with funcall except commands that are in
`helm-help-not-interactive-command'.
For convenience you can add bindings here with `helm-help-define-key'."
:type '(alist :key-type string :key-value symbol)
:group 'helm)
(defvar helm-help-not-interactive-command '(isearch-forward isearch-backward)
"Commands that we don't want to call interactively in `helm-help'.")
(defun helm-help-internal (bufname insert-content-fn)
"Show long message during Helm session in BUFNAME.
INSERT-CONTENT-FN is the function that inserts text to be
displayed in BUFNAME."
(let ((winconf (current-frame-configuration))
(hframe (selected-frame)))
(helm-log-run-hook 'helm-help-mode-before-hook)
(with-selected-frame helm-initial-frame
(select-frame-set-input-focus helm-initial-frame)
(unwind-protect
(progn
(setq helm-suspend-update-flag t)
(set-buffer (get-buffer-create bufname))
(switch-to-buffer bufname)
(when helm-help-full-frame (delete-other-windows))
(delete-region (point-min) (point-max))
(org-mode)
(save-excursion
(funcall insert-content-fn)
(goto-char (point-min))
(while (re-search-forward "^[|]" nil t)
(when (org-table-p t)
(org-table-align)
(goto-char (org-table-end)))))
(org-mark-ring-push) ; Put mark at bob
(buffer-disable-undo)
(helm-help-event-loop))
(raise-frame hframe)
(helm-log-run-hook 'helm-help-mode-after-hook)
(setq helm-suspend-update-flag nil)
(set-frame-configuration winconf)))))
(cl-defun helm-help-scroll-up (&optional (amount helm-scroll-amount))
"Scroll up in `helm-help'."
(condition-case _err
(scroll-up-command amount)
(beginning-of-buffer nil)
(end-of-buffer nil)))
(cl-defun helm-help-scroll-down (&optional (amount helm-scroll-amount))
"Scroll down in `helm-help'."
(condition-case _err
(scroll-down-command amount)
(beginning-of-buffer nil)
(end-of-buffer nil)))
(defun helm-help-next-line ()
"Next line function for `helm-help'."
(condition-case _err
(call-interactively #'next-line)
(beginning-of-buffer nil)
(end-of-buffer nil)))
(defun helm-help-previous-line ()
"Previous line function for `helm-help'."
(condition-case _err
(call-interactively #'previous-line)
(beginning-of-buffer nil)
(end-of-buffer nil)))
(defun helm-help-toggle-mark ()
"Toggle mark in `helm-help'."
(if (region-active-p)
(deactivate-mark)
(push-mark nil nil t)))
(defun helm-help-org-cycle ()
"Runs `org-cycle' in `helm-help'."
(pcase (helm-iter-next helm-help--iter-org-state)
((pred numberp) (org-content))
((and state) (org-cycle state))))
(defun helm-help-copy-region-as-kill ()
"Copy region function for `helm-help'"
(copy-region-as-kill
(region-beginning) (region-end))
(deactivate-mark))
(defun helm-help-quit ()
"Quit `helm-help'."
(throw 'helm-help-quit nil))
(defun helm-help-org-open-at-point ()
"Calls `org-open-at-point' ignoring errors."
(ignore-errors
(org-open-at-point)))
(defun helm-help-org-mark-ring-goto ()
"Calls `org-mark-ring-goto' ignoring errors."
(ignore-errors
(org-mark-ring-goto)))
(defun helm-help-event-loop ()
"The loop in charge of scanning keybindings in `helm-help'."
(let ((prompt (propertize
helm-help-default-prompt
'face 'helm-helper))
scroll-error-top-bottom
(helm-help--iter-org-state (helm-iter-circular '(1 (16) (64)))))
(catch 'helm-help-quit
(helm-awhile (read-key prompt)
(let ((fun (cl-loop for (k . v) in helm-help-hkmap
when (eql (aref (kbd k) 0) it)
return v)))
(when fun
(if (and (commandp fun)
(not (memq fun helm-help-not-interactive-command)))
;; For movement of cursor in help buffer we need to
;; call interactively commands for impaired people
;; using a synthetizer (Bug#1347).
(call-interactively fun)
(funcall fun))))))))
(defun helm-help-define-key (key function &optional override)
"Add KEY bound to fUNCTION in `helm-help-hkmap'.
If OVERRIDE is non nil, all bindings associated with FUNCTION are
removed and only (KEY . FUNCTION) is kept.
If FUNCTION is nil (KEY . FUNCTION) is not added and removed from
alist if already present.
See `helm-help-hkmap' for supported keys and functions."
(cl-assert (not (cdr (split-string key))) nil
(format "Error: Unsuported key `%s'" key))
(when override
(helm-awhile (rassoc function helm-help-hkmap)
(setq helm-help-hkmap (delete it helm-help-hkmap))))
(helm-aif (and (null function) (assoc key helm-help-hkmap))
(setq helm-help-hkmap (delete it helm-help-hkmap))
(and function (add-to-list 'helm-help-hkmap `(,key . ,function)))))
;;; Multiline transformer
;;
(defun helm-multiline-transformer (candidates _source)
(cl-loop with offset = (helm-interpret-value
(assoc-default 'multiline (helm-get-current-source)))
for cand in candidates
for disp = (or (car-safe cand) cand)
for real = (or (cdr-safe cand) cand)
if (numberp offset)
collect (cons (helm--multiline-get-truncated-candidate disp offset)
real)
else collect (cons disp real)))
(defun helm--multiline-get-truncated-candidate (candidate offset)
"Truncate CANDIDATE when its length is > than OFFSET."
(with-temp-buffer
(insert candidate)
(goto-char (point-min))
(if (and offset
(> (buffer-size) offset))
(let ((end-str "[...]"))
(concat
(buffer-substring
(point)
(save-excursion
(forward-char offset)
(setq end-str (if (looking-at "\n")
end-str (concat "\n" end-str)))
(point)))
end-str))
(buffer-string))))
;;; List processing
;;
(defun helm-flatten-list (seq)
"Return a list of all single elements of sublists in SEQ.
Example:
(helm-flatten-list '(1 (2 . 3) nil (4 5 (6) 7) 8 (9 . 10)))
=> (1 2 3 4 5 6 7 8 9 10)"
(let (result)
(cl-labels ((flatten
(seq)
(cl-loop for elm in seq
if (consp elm)
do (flatten
(if (atom (cdr elm))
(list (car elm) (cdr elm))
elm))
else do (and elm (push elm result)))))
(flatten seq))
(nreverse result)))
(defun helm-mklist (obj)
"If OBJ is a list \(but not lambda\), return itself.
Otherwise make a list with one element."
(if (and (listp obj) (not (functionp obj)))
obj
(list obj)))
(cl-defun helm-fast-remove-dups (seq &key (test 'eq))
"Remove duplicates elements in list SEQ.
This is same as `remove-duplicates' but with memoisation.
It is much faster, especially in large lists.
A test function can be provided with TEST argument key.
Default is `eq'.
NOTE: Comparison of special Elisp objects (e.g., markers etc.)
fails because their printed representations which are stored in
hash-table can't be compared with with the real object in SEQ.
This is a bug in `puthash' which store the printable
representation of object instead of storing the object itself,
this to provide at the end a printable representation of
hashtable itself."
(cl-loop with cont = (make-hash-table :test test)
for elm in seq
unless (gethash elm cont)
collect (puthash elm elm cont)))
(defsubst helm--string-join (strings &optional separator)
"Join all STRINGS using SEPARATOR."
(mapconcat 'identity strings separator))
(defun helm--concat-regexps (regexp-list)
"Return a regexp which matches any of the regexps in REGEXP-LIST."
(if regexp-list
(concat "\\(?:" (helm--string-join regexp-list "\\)\\|\\(?:") "\\)")
"\\`\\'")) ; Match nothing
(defun helm-skip-entries (seq black-regexp-list &optional white-regexp-list)
"Remove entries which match one of REGEXP-LIST from SEQ."
(let ((black-regexp (helm--concat-regexps black-regexp-list))
(white-regexp (helm--concat-regexps white-regexp-list)))
(cl-loop for i in seq
unless (and (stringp i)
(string-match-p black-regexp i)
(null
(string-match-p white-regexp i)))
collect i)))
(defun helm-boring-directory-p (directory black-list)
"Check if one regexp in BLACK-LIST matches DIRECTORY."
(helm-awhile (helm-basedir (directory-file-name
(expand-file-name directory)))
;; Break at root to avoid infloop, root is / or on Windows
;; C:/ i.e. <volume>:/ (Bug#2308).
(when (string-match-p "\\`[A-Za-z]?:?/\\'" it)
(cl-return nil))
(when (cl-loop for r in black-list
thereis (string-match-p
r (directory-file-name directory)))
(cl-return t))
(setq directory it)))
(defun helm-shadow-entries (seq regexp-list)
"Put shadow property on entries in SEQ matching a regexp in REGEXP-LIST."
(let ((face 'italic))
(cl-loop for i in seq
if (cl-loop for regexp in regexp-list
thereis (and (stringp i)
(string-match regexp i)))
collect (propertize i 'face face)
else collect i)))
(defun helm-remove-if-not-match (regexp seq)
"Remove all elements of SEQ that don't match REGEXP."
(cl-loop for s in seq
for str = (cond ((symbolp s)
(symbol-name s))
((consp s)
(car s))
(t s))
when (string-match-p regexp str)
collect s))
(defun helm-remove-if-match (regexp seq)
"Remove all elements of SEQ that match REGEXP."
(cl-loop for s in seq
for str = (cond ((symbolp s)
(symbol-name s))
((consp s)
(car s))
(t s))
unless (string-match-p regexp str)
collect s))
(defun helm-transform-mapcar (function args)
"`mapcar' for candidate-transformer.
ARGS is (cand1 cand2 ...) or ((disp1 . real1) (disp2 . real2) ...)
\(helm-transform-mapcar 'upcase '(\"foo\" \"bar\"))
=> (\"FOO\" \"BAR\")
\(helm-transform-mapcar 'upcase '((\"1st\" . \"foo\") (\"2nd\" . \"bar\")))
=> ((\"1st\" . \"FOO\") (\"2nd\" . \"BAR\"))
"
(cl-loop for arg in args
if (consp arg)
collect (cons (car arg) (funcall function (cdr arg)))
else
collect (funcall function arg)))
(defsubst helm-append-1 (elm seq)
"Append ELM to SEQ.
If ELM is not a list transform it in list."
(append (helm-mklist elm) seq))
(defun helm-append-at-nth (seq elm index)
"Append ELM at INDEX in SEQ."
(let ((len (length seq)))
(setq index (min (max index 0) len))
(if (zerop index)
(helm-append-1 elm seq)
(cl-loop for i in seq
for count from 1 collect i
when (= count index)
if (and (listp elm) (not (functionp elm)))
append elm
else collect elm))))
(defun helm-take-first-elements (seq n)
"Return the first N elements of SEQ if SEQ is longer than N.
It is used for narrowing list of candidates to the
`helm-candidate-number-limit'."
(if (> (length seq) n) (cl-subseq seq 0 n) seq))
(defun helm-source-by-name (name &optional sources)
"Get a Helm source in SOURCES by NAME.
Optional argument SOURCES is a list of Helm sources which default
to `helm-sources'."
(cl-loop with src-list = (if sources
(cl-loop for src in sources
collect (if (listp src)
src
(symbol-value src)))
helm-sources)
for source in src-list
thereis (and (string= name (assoc-default 'name source)) source)))
(defun helm-make-actions (&rest args)
"Build an alist with (NAME . ACTION) elements with each pairs in ARGS.
Where NAME is a string or a function returning a string or nil
and ACTION a function.
If NAME returns nil the pair is skipped.
\(fn NAME ACTION ...)"
(cl-loop for (name fn) on args by #'cddr
when (functionp name)
do (setq name (funcall name))
when name
collect (cons name fn)))
(defun helm-closest-number-in-list (num list)
"Return closest number to NUM found in LIST.
LIST is a list of numbers and NUM a number."
(cl-loop for i in list
for diff = (if (> num i) (- num i) (- i num))
collect (cons diff i) into res
minimize diff into min
finally return (cdr (assq min res))))
;;; Strings processing.
;;
(defun helm-stringify (elm)
"Return the representation of ELM as a string.
ELM can be a string, a number or a symbol."
(cl-typecase elm
(string elm)
(number (number-to-string elm))
(symbol (symbol-name elm))))
(defun helm-substring (str width)
"Return the substring of string STR from 0 to WIDTH.
Handle multibyte characters by moving by columns."
(with-temp-buffer