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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 ~ 2019 Thierry Volpiatto <[email protected]>
;; Author: Thierry Volpiatto <[email protected]>
;; 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-attr "helm.el")
(declare-function helm-attrset "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-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 (Issue #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)
(org-mark-ring-push) ; Put mark at bob
(save-excursion
(funcall insert-content-fn))
(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 (#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.
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))))
(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 &optional omit-nulls)
"Return a list of all single elements of sublists in SEQ."
(let (result)
(cl-labels ((flatten (seq)
(cl-loop
for elm in seq
if (and (or elm
(null omit-nulls))
(or (atom elm)
(functionp elm)
(and (consp elm)
(cdr elm)
(atom (cdr elm)))))
do (push elm result)
else do (flatten elm))))
(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>:/ (issue #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)))
;;; 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
(save-excursion
(insert str))
(move-to-column width)
(buffer-substring (point-at-bol) (point))))
(defun helm-substring-by-width (str width &optional endstr)
"Truncate string STR to end at column WIDTH.
Similar to `truncate-string-to-width'.
Add ENDSTR at end of truncated STR.
Add spaces at end if needed to reach WIDTH when STR is shorter
than WIDTH."
(cl-loop for ini-str = str
then (substring ini-str 0 (1- (length ini-str)))
for sw = (string-width ini-str)
when (<= sw width) return
(concat ini-str endstr (make-string (- width sw) ? ))))
(defun helm-string-multibyte-p (str)
"Check if string STR contains multibyte characters."
(cl-loop for c across str
thereis (> (char-width c) 1)))