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helm-lib.el
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;;; helm-lib.el --- Helm routines. -*- lexical-binding: t -*-
;; Copyright (C) 2015 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)
(require 'dired)
;;; 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)
;;; 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.")
;;; 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))
;;; Iterators
;;
(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-next (iterator)
"Return next elm of ITERATOR."
(funcall iterator))
(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 i on args by #'cddr
for name = (car i)
when (functionp name)
do (setq name (funcall name))
when name
collect (cons name (cadr i))))
(defmacro helm-aif (test-form then-form &rest else-forms)
"Like `if' but set the result of TEST-FORM in a temprary variable called `it'.
THEN-FORM and ELSE-FORMS are then excuted just like in `if'."
(declare (indent 2) (debug t))
`(let ((it ,test-form))
(if it ,then-form ,@else-forms)))
(defun helm-current-line-contents ()
"Current line string without properties."
(buffer-substring-no-properties (point-at-bol) (point-at-eol)))
;;; 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.
;;
(defun helm-help-internal (bufname insert-content-fn)
"Show long message during `helm' session in BUFNAME.
INSERT-CONTENT-FN is the function that insert
text to be displayed in BUFNAME."
(let ((winconf (current-frame-configuration)))
(unwind-protect
(progn
(setq helm-suspend-update-flag t)
(set-buffer (get-buffer-create bufname))
(switch-to-buffer bufname)
(delete-other-windows)
(delete-region (point-min) (point-max))
(org-mode)
(save-excursion
(funcall insert-content-fn))
(setq cursor-type nil)
(buffer-disable-undo)
(helm-help-event-loop))
(setq helm-suspend-update-flag nil)
(set-frame-configuration winconf))))
(defun helm-help-scroll-up (amount)
(condition-case _err
(scroll-up-command amount)
(beginning-of-buffer nil)
(end-of-buffer nil)))
(defun helm-help-scroll-down (amount)
(condition-case _err
(scroll-down-command amount)
(beginning-of-buffer nil)
(end-of-buffer nil)))
(defun helm-help-event-loop ()
(let ((prompt (propertize
"[SPC,C-v,down,next:NextPage b,M-v,up,prior:PrevPage C-s/r:Isearch q:Quit]"
'face 'helm-helper))
scroll-error-top-bottom)
(cl-loop for event = (read-key prompt) do
(cl-case event
((?\C-v ? down next) (helm-help-scroll-up helm-scroll-amount))
((?\M-v ?b up prior) (helm-help-scroll-down helm-scroll-amount))
(?\C-s (isearch-forward))
(?\C-r (isearch-backward))
(?q (cl-return))
(t (ignore))))))
;;; 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-defmacro helm-position (item seq &key (test 'eq) all)
"A simple and faster replacement of CL `position'.
Return position of first occurence of ITEM found in SEQ.
Argument SEQ can be a string, in this case ITEM have to be a char.
Argument ALL, if non--nil specify to return a list of positions of
all ITEM found in SEQ."
(let ((key (if (stringp seq) 'across 'in)))
`(cl-loop for c ,key ,seq
for index from 0
when (funcall ,test c ,item)
if ,all collect index into ls
else return index
finally return ls)))
(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'."
(cl-loop with cont = (make-hash-table :test test)
for elm in seq
unless (gethash elm cont)
do (puthash elm elm cont)
finally return
(cl-loop for i being the hash-values in cont collect i)))
(defun helm-skip-entries (seq black-regexp-list &optional white-regexp-list)
"Remove entries which matches one of REGEXP-LIST from SEQ."
(cl-loop for i in seq
unless (and (cl-loop for re in black-regexp-list
thereis (and (stringp i)
(string-match-p re i)))
(null
(cl-loop for re in white-regexp-list
thereis (and (stringp i)
(string-match-p re i)))))
collect i))
(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)))
;;; Strings processing.
;;
(defun helm-stringify (str-or-sym)
"Get string of STR-OR-SYM."
(if (stringp str-or-sym)
str-or-sym
(symbol-name str-or-sym)))
(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)))
(defun helm-get-pid-from-process-name (process-name)
"Get pid from running process PROCESS-NAME."
(cl-loop with process-list = (list-system-processes)
for pid in process-list
for process = (assoc-default 'comm (process-attributes pid))
when (and process (string-match process-name process))
return pid))
(defun helm-ff-find-printers ()
"Return a list of available printers on Unix systems."
(when (executable-find "lpstat")
(let ((printer-list (with-temp-buffer
(call-process "lpstat" nil t nil "-a")
(split-string (buffer-string) "\n"))))
(cl-loop for p in printer-list
for printer = (car (split-string p))
when printer
collect printer))))
(defun helm-region-active-p ()
(and transient-mark-mode mark-active (/= (mark) (point))))
;;; Symbols routines
;;
(defun helm-symbolify (str-or-sym)
"Get symbol of STR-OR-SYM."
(if (symbolp str-or-sym)
str-or-sym
(intern str-or-sym)))
(defun helm-symbol-name (obj)
(if (or (consp obj) (byte-code-function-p obj))
"Anonymous"
(symbol-name obj)))
(defun helm-describe-function (func)
"FUNC is symbol or string."
(describe-function (helm-symbolify func))
(message nil))
(defun helm-describe-variable (var)
"VAR is symbol or string."
(describe-variable (helm-symbolify var))
(message nil))
(defun helm-describe-face (face)
"VAR is symbol or string."
(describe-face (helm-symbolify face))
(message nil))
(defun helm-find-function (func)
"FUNC is symbol or string."
(find-function (helm-symbolify func)))
(defun helm-find-variable (var)
"VAR is symbol or string."
(find-variable (helm-symbolify var)))
(defun helm-kill-new (candidate &optional replace)
"CANDIDATE is symbol or string.
See `kill-new' for argument REPLACE."
(kill-new (helm-stringify candidate) replace))
;;; Files routines
;;
(defun helm-basename (fname &optional ext)
"Print FNAME with any leading directory components removed.
If specified, also remove filename extension EXT."
(let ((non-essential t))
(if (and ext (or (string= (file-name-extension fname) ext)
(string= (file-name-extension fname t) ext))
(not (file-directory-p fname)))
(file-name-sans-extension (file-name-nondirectory fname))
(file-name-nondirectory (directory-file-name fname)))))
(defun helm-basedir (fname)
"Return the base directory of filename ending by a slash."
(helm-aif (and fname
(or (and (string= fname "~") "~")
(file-name-directory fname)))
(file-name-as-directory it)))
(defun helm-current-directory ()
"Return current-directory name at point.
Useful in dired buffers when there is inserted subdirs."
(expand-file-name
(if (eq major-mode 'dired-mode)
(dired-current-directory)
default-directory)))
(defun helm-w32-prepare-filename (file)
"Convert filename FILE to something usable by external w32 executables."
(replace-regexp-in-string ; For UNC paths
"/" "\\"
(replace-regexp-in-string ; Strip cygdrive paths
"/cygdrive/\\(.\\)" "\\1:"
file nil nil) nil t))
(defun helm-w32-shell-execute-open-file (file)
(interactive "fOpen file:")
(with-no-warnings
(w32-shell-execute "open" (helm-w32-prepare-filename file))))
;; Same as `vc-directory-exclusion-list'.
(defvar helm-walk-ignore-directories
'("SCCS" "RCS" "CVS" "MCVS" ".svn" ".git" ".hg" ".bzr"
"_MTN" "_darcs" "{arch}" ".gvfs"))
(cl-defun helm-walk-directory (directory &key (path 'basename)
(directories t)
match skip-subdirs)
"Walk through DIRECTORY tree.
Argument PATH can be one of basename, relative, full, or a function
called on file name, default to basename.
Argument DIRECTORIES when non--nil (default) return also directories names,
otherwise skip directories names.
Argument MATCH can be a predicate or a regexp.
Argument SKIP-SUBDIRS when non--nil will skip `helm-walk-ignore-directories'
unless it is given as a list of directories, in this case this list will be used
instead of `helm-walk-ignore-directories'."
(let* ((result '())
(fn (cl-case path
(basename 'file-name-nondirectory)
(relative 'file-relative-name)
(full 'identity)
(t path))))
(cl-labels ((ls-rec (dir)
(unless (and skip-subdirs
(member (helm-basename dir)
(if (listp skip-subdirs)
skip-subdirs
helm-walk-ignore-directories)))
(cl-loop with ls = (sort (file-name-all-completions "" dir)
'string-lessp)
for f in ls
;; Use `directory-file-name' to remove the final slash.
;; Needed to avoid infloop on symlinks symlinking
;; a directory inside it [1].
for file = (directory-file-name
(expand-file-name f dir))
unless (member f '("./" "../"))
;; A directory.
if (char-equal (aref f (1- (length f))) ?/)
do (progn (when directories
(push (funcall fn file) result))
;; Don't recurse in symlinks.
;; `file-symlink-p' have to be called
;; on the directory with its final
;; slash removed [1].
(and (not (file-symlink-p file))
(ls-rec file)))
else do
(if match
(and (if (functionp match)
(funcall match f)
(and (stringp match)
(string-match match f)))
(push (funcall fn file) result))
(push (funcall fn file) result))))))
(ls-rec directory)
(nreverse result))))
(defun helm-file-expand-wildcards (pattern &optional full)
"Same as `file-expand-wildcards' but allow recursion.
Recursion happen when PATTERN starts with two stars.
Directories expansion is not supported."
(let ((bn (helm-basename pattern)))
(if (and helm-file-globstar
(string-match "\\`\\*\\{2\\}\\(.*\\)" bn))
(helm-walk-directory (helm-basedir pattern)
:path (cl-case full
(full 'full)
(relative 'relative)
((basename nil) 'basename)
(t 'full))
:directories nil
:match (wildcard-to-regexp bn)
:skip-subdirs t)
(file-expand-wildcards pattern full))))
;;; helm internals
;;
(defun helm-set-pattern (pattern &optional noupdate)
"Set minibuffer contents to PATTERN.
if optional NOUPDATE is non-nil, helm buffer is not changed."
(with-selected-window (or (active-minibuffer-window) (minibuffer-window))
(delete-minibuffer-contents)
(insert pattern))
(when noupdate
(setq helm-pattern pattern)))
(defun helm-minibuffer-completion-contents ()
"Return the user input in a minibuffer before point as a string.
That is what completion commands operate on."
(buffer-substring (field-beginning) (point)))
(defmacro with-helm-buffer (&rest body)
"Eval BODY inside `helm-buffer'."
(declare (indent 0) (debug t))
`(with-current-buffer (helm-buffer-get)
,@body))
(defmacro with-helm-current-buffer (&rest body)
"Eval BODY inside `helm-current-buffer'."
(declare (indent 0) (debug t))
`(with-current-buffer (or (and (buffer-live-p helm-current-buffer)
helm-current-buffer)
(setq helm-current-buffer
(current-buffer)))
,@body))
(defun helm-buffer-get ()
"Return `helm-action-buffer' if shown otherwise `helm-buffer'."
(if (helm-action-window)
helm-action-buffer
helm-buffer))
(defun helm-window ()
"Window of `helm-buffer'."
(get-buffer-window (helm-buffer-get) 0))
(defun helm-action-window ()
"Window of `helm-action-buffer'."
(get-buffer-window helm-action-buffer 'visible))
(defmacro with-helm-window (&rest body)
"Be sure BODY is excuted in the helm window."
(declare (indent 0) (debug t))
`(with-selected-window (helm-window)
,@body))
;; Yank text at point.
;;
;;
(defun helm-yank-text-at-point ()
"Yank text at point in `helm-current-buffer' into minibuffer."
(interactive)
(with-helm-current-buffer
(let ((fwd-fn (or helm-yank-text-at-point-function #'forward-word)))
;; Start to initial point if C-w have never been hit.
(unless helm-yank-point (setq helm-yank-point (point)))
(save-excursion
(goto-char helm-yank-point)
(funcall fwd-fn 1)
(helm-set-pattern
(concat
helm-pattern (replace-regexp-in-string
"\\`\n" ""
(buffer-substring-no-properties
helm-yank-point (point)))))
(setq helm-yank-point (point))))))
(defun helm-reset-yank-point ()
(setq helm-yank-point nil))
(add-hook 'helm-cleanup-hook 'helm-reset-yank-point)
(add-hook 'helm-after-initialize-hook 'helm-reset-yank-point)
;;; Ansi
;;
;;
(defvar helm--ansi-color-regexp
"\033\\[\\(K\\|[0-9;]*m\\)")
(defvar helm--ansi-color-drop-regexp
"\033\\[\\([ABCDsuK]\\|[12][JK]\\|=[0-9]+[hI]\\|[0-9;]*[Hf]\\)")
(defun helm--ansi-color-apply (string)
"A version of `ansi-color-apply' immune to upstream changes.
Similar to the emacs-24.5 version without support to `ansi-color-context'
which is buggy in emacs.
Modify also `ansi-color-regexp' by using own variable `helm--ansi-color-regexp'
that match whole STRING.
This is needed to provide compatibility for both emacs-25 and emacs-24.5
as emacs-25 version of `ansi-color-apply' is partially broken."
(let ((start 0)
codes end escape-sequence
result colorized-substring)
;; Find the next escape sequence.
(while (setq end (string-match helm--ansi-color-regexp string start))
(setq escape-sequence (match-string 1 string))
;; Colorize the old block from start to end using old face.
(when codes
(put-text-property
start end 'font-lock-face (ansi-color--find-face codes) string))
(setq colorized-substring (substring string start end)
start (match-end 0))
;; Eliminate unrecognized ANSI sequences.
(while (string-match helm--ansi-color-drop-regexp colorized-substring)
(setq colorized-substring
(replace-match "" nil nil colorized-substring)))
(push colorized-substring result)
;; Create new face, by applying escape sequence parameters.
(setq codes (ansi-color-apply-sequence escape-sequence codes)))
;; If the rest of the string should have a face, put it there.
(when codes
(put-text-property
start (length string)
'font-lock-face (ansi-color--find-face codes) string))
;; Save the remainder of the string to the result.
(if (string-match "\033" string start)
(push (substring string start (match-beginning 0)) result)
(push (substring string start) result))
(apply 'concat (nreverse result))))
(provide 'helm-lib)
;; Local Variables:
;; byte-compile-warnings: (not cl-functions obsolete)
;; coding: utf-8
;; indent-tabs-mode: nil
;; End:
;;; helm-lib ends here