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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
;; Author: Thierry Volpiatto
;; 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 ffap-file-remote-p "ffap.el")
(declare-function ffap-url-p "ffap.el")
(declare-function helm-get-attr "helm-core.el")
(declare-function helm-set-attr "helm-core.el")
(declare-function helm-follow-mode-p "helm-core.el")
(declare-function helm-get-current-source "helm-core.el")
(declare-function helm-get-selection "helm-core.el")
(declare-function helm-get-sources "helm-core.el")
(declare-function helm-interpret-value "helm-core.el")
(declare-function helm-log-run-hook "helm-core.el")
(declare-function helm-next-line "helm-core.el")
(declare-function helm-get-next-header-pos "helm-core.el")
(declare-function helm-mark-current-line "helm-core.el")
(declare-function helm-marked-candidates "helm-core.el")
(declare-function helm-set-case-fold-search "helm-core.el")
(declare-function helm-get-previous-header-pos "helm-core.el")
(declare-function helm-source--cl--print-table "helm-source.el")
(declare-function helm-update "helm-core.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 helm-read-file-name "helm-mode.el")
(declare-function find-function-library "find-func.el")
(declare-function find-library-name "find-func.el")
(defvar helm-sources)
(defvar helm-initial-frame)
(defvar helm-current-position)
(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 helm-help-buffer-name)
(defvar completion-flex-nospace)
(defvar find-function-source-path)
(defvar ffap-machine-p-unknown)
(defvar ffap-machine-p-local)
(defvar ffap-machine-p-known)
(defvar helm-debug-output-buffer)
;;; 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 helm window or other window in a helm session.
It is used by `helm-scroll-other-window', `helm-scroll-up', `helm-scroll-down'
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)
(defcustom helm-current-directory-alist
'((dired-mode . dired-current-directory)
(mu4e-main-mode . mu4e-root-maildir))
"Tell `helm-current-directory' what to use according to `major-mode'.
Each element of alist is (MAJOR-MODE . SYMBOL) where SYMBOL is either a variable
or a function."
:type '(alist :key-type symbol :value-type sexp)
:group 'helm-files)
;;; 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.")
(defvar helm-current-prefix-arg nil
"Record `current-prefix-arg' when exiting minibuffer.")
(defvar helm-current-error nil
"Same as `compilation-current-error' but for helm-occur and helm-grep.")
;;; 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 `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)))
;; Available only in Emacs-28+
(unless (fboundp 'file-modes-number-to-symbolic)
(defun file-modes-number-to-symbolic (mode &optional filetype)
"Return a string describing a file's MODE.
For instance, if MODE is #o700, then it produces `-rwx------'.
FILETYPE if provided should be a character denoting the type of file,
such as `?d' for a directory, or `?l' for a symbolic link and will override
the leading `-' char."
(string
(or filetype
(pcase (ash mode -12)
;; POSIX specifies that the file type is included in st_mode
;; and provides names for the file types but values only for
;; the permissions (e.g., S_IWOTH=2).
;; (#o017 ??) ;; #define S_IFMT 00170000
(#o014 ?s) ;; #define S_IFSOCK 0140000
(#o012 ?l) ;; #define S_IFLNK 0120000
;; (8 ??) ;; #define S_IFREG 0100000
(#o006 ?b) ;; #define S_IFBLK 0060000
(#o004 ?d) ;; #define S_IFDIR 0040000
(#o002 ?c) ;; #define S_IFCHR 0020000
(#o001 ?p) ;; #define S_IFIFO 0010000
(_ ?-)))
(if (zerop (logand 256 mode)) ?- ?r)
(if (zerop (logand 128 mode)) ?- ?w)
(if (zerop (logand 64 mode))
(if (zerop (logand 2048 mode)) ?- ?S)
(if (zerop (logand 2048 mode)) ?x ?s))
(if (zerop (logand 32 mode)) ?- ?r)
(if (zerop (logand 16 mode)) ?- ?w)
(if (zerop (logand 8 mode))
(if (zerop (logand 1024 mode)) ?- ?S)
(if (zerop (logand 1024 mode)) ?x ?s))
(if (zerop (logand 4 mode)) ?- ?r)
(if (zerop (logand 2 mode)) ?- ?w)
(if (zerop (logand 512 mode))
(if (zerop (logand 1 mode)) ?- ?x)
(if (zerop (logand 1 mode)) ?T ?t)))))
(unless (and (fboundp 'pos-bol) (fboundp 'pos-eol))
(defalias 'pos-bol 'line-beginning-position)
(defalias 'pos-eol 'line-end-position))
;;; Compatibility with < Emacs-29
;; Needed by helm-packages.el and affixations functions for helm-mode (27)
;; waiting package.el moves on Elpa. Slightly modified to fit with
;; Emacs-27/28.
(when (eval-when-compile (< emacs-major-version 29)) ; Avoid warnings.
(progn
(require 'package)
(eval-and-compile
(defun package--archives-initialize ()
"Make sure the list of installed and remote packages are initialized."
(unless package--initialized
(package-initialize t))
(unless package-archive-contents
(package-refresh-contents)))
(defun package-get-descriptor (pkg-name)
"Return the `package-desc' of PKG-NAME."
(unless package--initialized (package-initialize 'no-activate))
(or (cadr (assq pkg-name package-alist))
(cadr (assq pkg-name package-archive-contents))))
(defun package-upgrade (name)
"Upgrade package NAME if a newer version exists."
(let* ((package (if (symbolp name)
name
(intern name)))
(pkg-desc (cadr (assq package package-alist))))
;; `pkg-desc' will be nil when the package is an "active built-in".
(when pkg-desc
(package-delete pkg-desc 'force 'dont-unselect))
(package-install package
;; An active built-in has never been "selected"
;; before. Mark it as installed explicitly.
(and pkg-desc 'dont-select))))
(defun package-recompile (pkg)
"Byte-compile package PKG again.
PKG should be either a symbol, the package name, or a `package-desc'
object."
(let ((pkg-desc (if (package-desc-p pkg)
pkg
(cadr (assq pkg package-alist)))))
;; Delete the old .elc files to ensure that we don't inadvertently
;; load them (in case they contain byte code/macros that are now
;; invalid).
(dolist (elc (directory-files-recursively
(package-desc-dir pkg-desc) "\\.elc\\'"))
(delete-file elc))
(package--compile pkg-desc)))
(defun package--dependencies (pkg)
"Return a list of all dependencies PKG has.
This is done recursively."
;; Can we have circular dependencies? Assume "nope".
(let* ((desc (cadr (assq pkg package-archive-contents)))
(deps (and desc (mapcar #'car (package-desc-reqs desc)))))
(when deps
(delete-dups
(apply #'nconc deps (mapcar #'package--dependencies deps)))))))))
;;; Provide `help--symbol-class' not available in emacs-27
;;
(unless (fboundp 'help--symbol-class)
(defun help--symbol-class (s)
"Return symbol class characters for symbol S."
(when (stringp s)
(setq s (intern-soft s)))
(concat
(when (fboundp s)
(concat
(cond
((commandp s) "c")
((eq (car-safe (symbol-function s)) 'macro) "m")
(t "f"))
(and (let ((flist (indirect-function s)))
(advice--p (if (eq 'macro (car-safe flist)) (cdr flist) flist)))
"!")
(and (get s 'byte-obsolete-info) "-")))
(when (boundp s)
(concat
(if (custom-variable-p s) "u" "v")
(and (local-variable-if-set-p s) "'")
(and (ignore-errors (not (equal (symbol-value s) (default-value s)))) "*")
(and (get s 'byte-obsolete-variable) "-")))
(and (facep s) "a")
(and (fboundp 'cl-find-class) (cl-find-class s) "t"))))
;; Inline `kmacro--to-vector' from E29 to fix compatibility of
;; `helm-kbd-macro-concat-macros' with E29 and E28.
(unless (fboundp 'kmacro--to-vector)
(defun kmacro--to-vector (object)
"Normalize an old-style key sequence to the vector form."
(if (not (stringp object))
object
(let ((vec (string-to-vector object)))
(unless (multibyte-string-p object)
(dotimes (i (length vec))
(let ((k (aref vec i)))
(when (> k 127)
(setf (aref vec i) (+ k ?\M-\C-@ -128))))))
vec))))
(defun helm-proper-list-p (obj)
"Compatibility function for `proper-list-p'."
(if (fboundp 'proper-list-p)
(proper-list-p obj) ; 27+
(and (listp obj) (not (cdr (last obj))))))
;;; 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
;;
(defconst helm-this-command-black-list
'(helm-maybe-exit-minibuffer
helm-confirm-and-exit-minibuffer
helm-exit-minibuffer
exit-minibuffer
helm-M-x))
(defconst helm-this-command-functions '(read-multiple-choice--long-answers)
"The functions that should be returned by `helm-this-command' when found.")
(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 for count from 1 to 50
for btf = (backtrace-frame count)
for fn = (cl-second btf)
;; Some commands like `kill-buffer' may call another function
;; involving a completing-read, in this case we want to stop at this
;; function and not go up to the initial interactive call (in this
;; case kill-buffer) See Issue#2634.
if (or (memq fn helm-this-command-functions)
(and
;; In some cases we may have in the way an
;; advice compiled resulting in byte-code,
;; ignore it (Bug#691).
(symbolp fn)
(commandp fn)
(not (memq fn helm-this-command-black-list))))
return fn
else
if (and (eq fn 'call-interactively)
(> (length btf) 2))
return (cadr (cdr btf))))
;;; Iterators
;;
(defun helm-iter-list (seq &optional cycle)
"Return an iterator object from SEQ.
The iterator die and return nil when it reach end of SEQ.
When CYCLE is specified the iterator never ends."
(let ((lis seq))
(lambda ()
(let ((elm (car lis)))
(setq lis (if cycle
(or (cdr lis) seq)
(cdr lis)))
elm))))
(defun helm-iter-circular (seq)
"Infinite iteration on SEQ."
(helm-iter-list seq 'cycle))
(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) (helm-take seq 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)
"Check if EXPR match KEYLIST and then execute BODY.
`helm-acase' is a small macro mixing the features of `cl-case'
and `cond'.
KEYLIST can be any object that will be compared with `equal' or
an expression starting with special symbol `guard*' which is then
evaluated. Once evaluated the symbol `guard' is bound to the
returned value that can be used in the cdr of clause. When
KEYLIST match EXPR or `guard*' sexp evaluation is non-nil, BODY
is executed and `helm-acase' exits with its value.
Note:
`guard*' sexp should not be a single symbol to eval, e.g. (guard* foo)
in such cases you should use (guard* (progn foo)).
KEYLIST can also be a list starting with special symbol `dst*'
followed by an expression suitable for `cl-destructuring-bind'.
In this case all elements of `it' are bound to the elements of
this expression e.g.
(helm-acase \\='(1 2 3 4 5)
((dst* (l &rest args)) args))
=> (2 3 4 5)
If KEYLIST is a list, it is compared with EXPR, also each
elements of the list are checked with `member' to see if one
matches EXPR, ensure to not use special symbols `guard*' and
`dst*' at start of such KEYLIST to avoid confusing helm-acase
even if this is partially supported.
The last clause can use `t' or \\='otherwise as KEYLIST to specify a
fallback clause when previous clauses didn't match, if such a clause
starting with `t' or \\='otherwise is specified before last clause it
will override all next clauses, if you want to match an EXPR value equal
to `t' in any clauses quote it, i.e. `'t' or use an explicit
\(guard* (eq it t)).
EXPR is bound to a temporary variable called `it' which is
usable in all clauses to refer to EXPR.
\(fn EXPR (KEYLIST BODY...)...)"
(declare (indent 1) (debug (form &rest ([&or (symbolp form) sexp] body))))
(unless (null clauses)
(let* ((clause1 (car clauses))
(key (car clause1))
(sexp (car-safe (cdr-safe key)))
(sp-sym (car-safe key))
;; Ensure dst* and guard* are not treated as special symbols when
;; they are not followed by one sexp and nothing else, however if the
;; following sexp is not meant to be evaluated but just compared we
;; fail miserably, is it worth fixing it?
(issexp (and (consp sexp) (= (length key) 2)))
(isguard (and (eq 'guard* sp-sym) issexp))
(isdst (and (eq 'dst* sp-sym) issexp))
(special (or isguard isdst))
(guard-sexp (and isguard sexp))
(dst-sexp (and isdst sexp)))
`(let* ((it ,expr)
(guard ,guard-sexp)
(dst (and (consp it) ',dst-sexp)))
(cond ((or guard
(and ,(not special)
(or (equal it ',key)
(and (listp ',key) (member it ',key))))
(and (symbolp ',key)
(or (eq ',key t) (eq ',key 'otherwise))))
;; When this branch is expanded the compiler complains about not
;; referenced variables (the ones in `dst' that will be used in
;; next branch) so prevent warnings instead of using a progn
;; Merci Stefan!
(with-no-warnings ,@(cdr clause1)))
((and dst
(condition-case nil
(cl-destructuring-bind ,dst-sexp it
,@(cdr clause1))
(wrong-number-of-arguments nil))))
(t
(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)
;; We want to collect e.g.
;; in "abcd" -> (("a" "b") ("b" "c") ("c" "d"))
;; and not (("a" "b") ("c" "d")) so we use by #'cdr which is the default.
;; If the last pair have no cdr i.e. (s1 nil) ignore it.
(cl-loop for (s1 s2) on (split-string string "" t)
when s2 collect (list s1 s2)))
;;; 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)
("C-M-f" . forward-sexp)
("C-M-b" . backward-sexp)
("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-internal" '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-internal" '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'."
(helm-acase (helm-iter-next helm-help--iter-org-state)
((guard* (numberp it)) (org-content))
;; See `helm--help-org-prefargs' about `org-cycle' ARG.
(t (org-cycle it))))
(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'."
(if (or (get-buffer-window helm-help-buffer-name 'visible)
(get-buffer-window helm-debug-output-buffer 'visible))
(throw 'helm-help-quit nil)
(quit-window)))
(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)))
(defvar helm--help-org-prefargs
(if (> emacs-major-version 28)
'(1 (4) (16)) '(1 (16) (64)))
"`org-cycle' ARG have not the same meaning across Emacs versions.")
(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 helm--help-org-prefargs)))
(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)
"Return OBJ as a proper list.
Otherwise make a proper list with one element OBJ.
Anonymous functions (lambdas) are treated as single elements."
(if (and (helm-proper-list-p 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."
(let ((table (make-hash-table :test test)))
(mapcan (lambda (x)
(unless (gethash x table)
(list (puthash x x table))))
seq)))
(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))