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helm.el
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helm.el
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;;; helm.el --- Emacs incremental and narrowing framework
;; Copyright (C) 2007 Tamas Patrovics
;; 2008 ~ 2011 rubikitch <rubikitch@ruby-lang.org>
;; 2011 ~ 2012 Thierry Volpiatto <thierry.volpiatto@gmail.com>
;; This is a fork of anything.el wrote by Tamas Patrovics.
;; Authors of anything.el: Tamas Patrovics
;; rubikitch <rubikitch@ruby-lang.org>
;; 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/>.
;;; Code:
(require 'cl)
;;; Multi keys
;;
;;
;;;###autoload
(defun helm-define-multi-key (keymap key functions &optional delay)
"In KEYMAP, define key sequence KEY for function list FUNCTIONS.
Each function run sequentialy each time the key KEY is pressed.
If DELAY is specified switch back to initial function of FUNCTIONS list
after DELAY seconds.
The functions in FUNCTIONS list are functions with no args.
e.g
\(defun foo ()
(message \"Run foo\"))
\(defun bar ()
(message \"Run bar\"))
\(defun baz ()
(message \"Run baz\"))
\(helm-define-multi-key global-map \"<f5> q\" '(foo bar baz) 2)
Each time \"<f5> q\" is pressed the next function is executed, if you wait
More than 2 seconds, next hit will run again the first function and so on."
(lexical-let ((funs functions)
(iter (gensym "helm-iter-key"))
(timeout delay))
(eval (list 'defvar iter nil))
(define-key keymap key #'(lambda ()
(interactive)
(helm-run-multi-key-command
funs iter timeout)))))
(defun helm-run-multi-key-command (functions iterator delay)
(let ((fn #'(lambda ()
(loop for count from 1 to (length functions)
collect count)))
next)
(unless (symbol-value iterator)
(set iterator (helm-iter-list (funcall fn))))
(setq next (helm-iter-next (symbol-value iterator)))
(unless next
(set iterator (helm-iter-list (funcall fn)))
(setq next (helm-iter-next (symbol-value iterator))))
(and next (eval iterator) (funcall (nth (1- next) functions)))
(when delay (run-with-idle-timer delay nil `(lambda ()
(setq ,iterator nil))))))
(defmacro helm-iter-list (seq)
"Return an iterator object from SEQ."
`(lexical-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))
;;; Keymap
;;
;;
(defvar helm-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map minibuffer-local-map)
(define-key map (kbd "<down>") 'helm-next-line)
(define-key map (kbd "<up>") 'helm-previous-line)
(define-key map (kbd "C-n") 'helm-next-line)
(define-key map (kbd "C-p") 'helm-previous-line)
(define-key map (kbd "<prior>") 'helm-previous-page)
(define-key map (kbd "<next>") 'helm-next-page)
(define-key map (kbd "M-v") 'helm-previous-page)
(define-key map (kbd "C-v") 'helm-next-page)
(define-key map (kbd "M-<") 'helm-beginning-of-buffer)
(define-key map (kbd "M->") 'helm-end-of-buffer)
(define-key map (kbd "C-g") 'helm-keyboard-quit)
(define-key map (kbd "<right>") 'helm-next-source)
(define-key map (kbd "<left>") 'helm-previous-source)
(define-key map (kbd "<RET>") 'helm-exit-minibuffer)
(define-key map (kbd "C-i") 'helm-select-action)
(define-key map (kbd "C-z") 'helm-execute-persistent-action)
(define-key map (kbd "C-e") 'helm-select-2nd-action-or-end-of-line)
(define-key map (kbd "C-j") 'helm-select-3rd-action)
(define-key map (kbd "C-o") 'helm-next-source)
(define-key map (kbd "C-l") 'helm-recenter-top-bottom-other-window)
(define-key map (kbd "M-C-l") 'helm-reposition-window-other-window)
(define-key map (kbd "C-M-v") 'helm-scroll-other-window)
(define-key map (kbd "M-<next>") 'helm-scroll-other-window)
(define-key map (kbd "C-M-y") 'helm-scroll-other-window-down)
(define-key map (kbd "C-M-S-v") 'helm-scroll-other-window-down)
(define-key map (kbd "M-<prior>") 'helm-scroll-other-window-down)
(define-key map (kbd "<C-M-down>") 'helm-scroll-other-window)
(define-key map (kbd "<C-M-up>") 'helm-scroll-other-window-down)
(define-key map (kbd "C-SPC") 'helm-toggle-visible-mark)
(define-key map (kbd "M-SPC") 'helm-toggle-visible-mark)
(define-key map (kbd "M-[") 'helm-prev-visible-mark)
(define-key map (kbd "M-]") 'helm-next-visible-mark)
(define-key map (kbd "C-k") 'helm-delete-minibuffer-contents)
(define-key map (kbd "C-x C-f") 'helm-quit-and-find-file)
(define-key map (kbd "M-m") 'helm-toggle-all-marks)
(define-key map (kbd "C-w") 'helm-yank-text-at-point)
(define-key map (kbd "C-M-a") 'helm-show-all-in-this-source-only)
(define-key map (kbd "C-r") 'undefined)
(define-key map (kbd "C-s") 'undefined)
(define-key map (kbd "M-s") 'undefined)
(define-key map (kbd "C-}") 'helm-narrow-window)
(define-key map (kbd "C-{") 'helm-enlarge-window)
(define-key map (kbd "C-c -") 'helm-swap-windows)
(define-key map (kbd "C-c C-d") 'helm-delete-current-selection)
(define-key map (kbd "C-c C-y") 'helm-yank-selection)
(define-key map (kbd "C-c C-k") 'helm-kill-selection-and-quit)
(define-key map (kbd "C-c C-f") 'helm-follow-mode)
(define-key map (kbd "C-c C-u") 'helm-force-update)
(define-key map (kbd "M-p") 'previous-history-element)
(define-key map (kbd "M-n") 'next-history-element)
(define-key map (kbd "C-!") 'helm-toggle-suspend-update)
;; Disable `file-cache-minibuffer-complete'.
(define-key map (kbd "<C-tab>") 'undefined)
;; Multi keys
(helm-define-multi-key map (kbd "C-t") '(helm-toggle-resplit-window
helm-swap-windows) 0.5)
;; Debugging command
(define-key map (kbd "C-h C-d") 'undefined)
(define-key map (kbd "C-h C-d") 'helm-debug-output)
;; Use `describe-mode' key in `global-map'.
(define-key map [f1] nil) ; Allow to eval keymap without errors.
(define-key map (kbd "C-h C-h") 'undefined)
(define-key map (kbd "C-h h") 'undefined)
(dolist (k (where-is-internal 'describe-mode global-map))
(define-key map k 'helm-help))
map)
"Keymap for helm.")
(defgroup helm nil
"Open helm."
:prefix "helm-" :group 'convenience)
(defcustom helm-completion-window-scroll-margin 5
" `scroll-margin' to use for helm completion window.
Which see. Set to 0 to disable.
NOTE: This have no effect when `helm-display-source-at-screen-top'
id non--nil."
:group 'helm
:type 'integer)
(defcustom helm-display-source-at-screen-top t
"Display candidates at the top of screen.
This happen when using `helm-next-source' and `helm-previous-source'.
NOTE: When non--nil (default) disable `helm-completion-window-scroll-margin'."
:group 'helm
:type 'boolean)
(defcustom helm-candidate-number-limit 100
"Limit candidate number globally.
Do not show more candidates than this limit from individual sources.
It is usually pointless to show hundreds of matches
when the pattern is empty, because it is much simpler to type a
few characters to narrow down the list of potential candidates.
Set it to nil if you don't want this limit."
:group 'helm
:type 'integer)
(defcustom helm-idle-delay 0.3
"Be idle for this many seconds, before updating in delayed sources.
This is useful for sources involving heavy operations
\(like launching external programs\), so that candidates
from the source are not retrieved unnecessarily if the user keeps typing.
It also can be used to declutter the results helm displays,
so that results from certain sources are not shown with every
character typed, only if the user hesitates a bit.
Be sure to know what you are doing when modifying this."
:group 'helm
:type 'float)
(defcustom helm-input-idle-delay 0.3
"Be idle for this many seconds, before updating.
Unlike `helm-idle-delay', it is also effective for non-delayed sources.
If nil, candidates are collected immediately.
Note: If this value is too low compared to `helm-idle-delay',
you may have duplicated sources when using multiples sources.
Safe value is always >= `helm-idle-delay'.
Default settings are equal value for both.
Be sure to know what you are doing when modifying this."
:group 'helm
:type 'float)
(defcustom helm-full-frame nil
"Use current window to show the candidates.
If t then Helm doesn't pop up a new window."
:group 'helm
:type 'boolean)
(defvaralias 'helm-samewindow 'helm-full-frame)
(make-obsolete-variable 'helm-samewindow 'helm-full-frame "1.4.8.1")
(defcustom helm-quick-update nil
"If non-nil, suppress displaying sources which are out of screen at first.
They are treated as delayed sources at this input.
This flag makes `helm' a bit faster with many sources."
:group 'helm
:type 'boolean)
(defcustom helm-candidate-separator
"--------------------"
"Candidates separator of `multiline' source."
:group 'helm
:type 'string)
(defcustom helm-save-configuration-functions
'(set-window-configuration . current-window-configuration)
"The functions used to restore/save window or frame configurations.
It is a pair where the car is the function to restore window or frame config,
and the cdr is the function to save the window or frame config.
If you want to save and restore frame configuration, set this variable to
'\(set-frame-configuration . current-frame-configuration\)
NOTE: This may not work properly with own-frame minibuffer settings.
Older version saves/restores frame configuration, but the default is changed now
because flickering can occur in some environment."
:group 'helm
:type 'sexp)
(defcustom helm-persistent-action-use-special-display nil
"If non-nil, use `special-display-function' in persistent action."
:group 'helm
:type 'boolean)
(defcustom helm-scroll-amount nil
"Scroll amount when scrolling other window in an 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-display-function 'helm-default-display-buffer
"Function to display *helm* buffer.
It is `helm-default-display-buffer' by default,
which affects `helm-full-frame'."
:group 'helm
:type 'symbol)
(defcustom helm-case-fold-search 'smart
"Add 'smart' option to `case-fold-search'.
When smart is enabled, ignore case in the search strings
if pattern contains no uppercase characters.
Otherwise, with a nil or t value, the behavior is same as
`case-fold-search'.
Default value is smart, other possible values are nil and t.
NOTE: This have no effect in asynchronous sources, you will
have to implement a similar feature directly in the process.
See in helm-grep.el how it is implemented."
:group 'helm
:type 'symbol)
(defcustom helm-file-name-case-fold-search
(if (memq system-type
'(cygwin windows-nt ms-dos darwin))
t
helm-case-fold-search)
"Local setting of `helm-case-fold-search' for reading filenames.
See `helm-case-fold-search' for more info."
:group 'helm
:type 'symbol)
(defcustom helm-reuse-last-window-split-state nil
"Reuse the last state of window split, vertical or horizontal.
That is when you use `helm-toggle-resplit-window' the next helm session
will reuse the same window scheme than the one of last session."
:group 'helm
:type 'boolean)
(defcustom helm-split-window-preferred-function 'helm-split-window-default-fn
"Default function used for splitting window."
:group 'helm
:type 'function)
(defcustom helm-split-window-default-side 'below
"The default side to display `helm-buffer'.
Must be one acceptable arg for `split-window' SIDE,
that is 'below, 'above, 'left or 'right.
Another acceptable value is 'same which always display `helm-buffer'
in current window.
A nil value as same effect as 'below.
If `helm-full-frame' is non--nil, it take precedence on this.
See also `helm-split-window-in-side-p'.
NOTE: this have no effect if `helm-split-window-preferred-function' is not
`helm-split-window-default-fn' unless this new function handle this."
:group 'helm
:type 'symbol)
(defcustom helm-split-window-in-side-p nil
"Force splitting inside selected window when non--nil.
See also `helm-split-window-default-side'.
NOTE: this have no effect if `helm-split-window-preferred-function' is not
`helm-split-window-default-fn' unless this new function handle this."
:group 'helm
:type 'boolean)
(defcustom helm-sources-using-default-as-input '(helm-c-source-imenu
helm-c-source-info-elisp
helm-c-source-etags-select)
"List of helm sources that need to use `helm-maybe-use-default-as-input'.
When a source is member of this list, default `thing-at-point'
will be used as input."
:group 'helm
:type '(repeat (choice symbol)))
(defcustom helm-never-delay-on-input t
"Globally disable the use of `while-no-input' in all sources when non--nil.
This can be done individually by source adding the attribute
`no-delay-on-input' in source. This have no effect on async source
that are not using `while-no-input'.
It is disabled by default because it is not supported on some system
like \"Mac Osx\" but it is a good idea to enable it if
supported by your system. Known to works fine on GNU/Linux and Windows."
:group 'helm
:type 'boolean)
;;; Faces
;;
;;
(defface helm-source-header
'((((background dark))
:background "#22083397778B"
:foreground "white"
:weight bold :height 1.3 :family "Sans Serif")
(((background light))
:background "#abd7f0"
:foreground "black"
:weight bold :height 1.3 :family "Sans Serif"))
"Face for source header in the helm buffer."
:group 'helm)
(defface helm-visible-mark
'((((min-colors 88) (background dark))
(:background "green1" :foreground "black"))
(((background dark))
(:background "green" :foreground "black"))
(((background light)) :background "#d1f5ea")
(((min-colors 88))
(:background "green1"))
(t (:background "green")))
"Face for visible mark."
:group 'helm)
(defface helm-header
'((t (:inherit header-line)))
"Face for header lines in the helm buffer."
:group 'helm)
(defface helm-candidate-number
'((((background dark)) :background "Yellow" :foreground "black")
(((background light)) :background "#faffb5" :foreground "black"))
"Face for candidate number in mode-line." :group 'helm)
(defface helm-selection
'((((background dark)) :background "ForestGreen" :underline t)
(((background light)) :background "#b5ffd1" :underline t))
"Face for currently selected item in the helm buffer."
:group 'helm)
(defface helm-separator
'((((background dark)) :foreground "red")
(((background light)) :foreground "#ffbfb5"))
"Face for multiline source separator."
:group 'helm)
(defface helm-action
'((t (:underline t)))
"Face for action lines in the helm action buffer."
:group 'helm)
;;; Variables.
;;
;;
(defvar helm-type-attributes nil
"It's a list of \(TYPE ATTRIBUTES ...\).
ATTRIBUTES are the same as attributes for `helm-sources'.
TYPE connects the value to the appropriate sources.
Don't set this directly, use instead `define-helm-type-attribute'.
This allows specifying common attributes for several sources.
For example, sources which provide files can specify
common attributes with a `file' type.")
(defvar helm-source-filter nil
"A list of source names to be displayed.
Other sources won't appear in the search results.
If nil then there is no filtering.
See also `helm-set-source-filter'.")
(defvar helm-action-buffer "*helm action*"
"Buffer showing actions.")
(defvar helm-selection-overlay nil
"Overlay used to highlight the currently selected item.")
(defvar helm-async-processes nil
"List of information about asynchronous processes managed by helm.")
(defvar helm-before-initialize-hook nil
"Run before helm initialization.
This hook is run before init functions in `helm-sources'.")
(defvar helm-after-initialize-hook nil
"Run after helm initialization.
Global variables are initialized and the helm buffer is created.
But the helm buffer has no contents.")
(defvar helm-update-hook nil
"Run after the helm buffer was updated according the new input pattern.
This hook is run at the beginning of buffer.
The first candidate is selected after running this hook.
See also `helm-after-update-hook'.")
(defvar helm-after-update-hook nil
"Run after the helm buffer was updated according the new input pattern.
This is very similar to `helm-update-hook' but selection is not moved.
It is useful to select a particular object instead of the first one.")
(defvar helm-cleanup-hook nil
"Run after helm minibuffer is closed.
IOW this hook is executed BEFORE performing action.")
(defvar helm-select-action-hook nil
"Run when opening the action buffer.")
(defvar helm-before-action-hook nil
"Run before executing action.
Contrarily to `helm-cleanup-hook',
this hook run before helm minibuffer is closed
and before performing action.")
(defvar helm-after-action-hook nil
"Run after executing action.")
(defvar helm-after-persistent-action-hook nil
"Run after executing persistent action.")
(defvar helm-move-selection-before-hook nil
"Run before moving selection in `helm-buffer'.")
(defvar helm-move-selection-after-hook nil
"Run after moving selection in `helm-buffer'.")
(defvar helm-restored-variables
'(helm-candidate-number-limit
helm-source-filter
helm-source-in-each-line-flag
helm-map
helm-sources)
"Variables which are restored after `helm' invocation.")
(defvar helm-saved-selection nil
"Value of the currently selected object when the action list is shown.")
(defvar helm-current-prefix-arg nil
"Record `current-prefix-arg' when exiting minibuffer.")
(defvar helm-saved-action nil
"Saved value of the currently selected action by key.")
;; [TODO] Remove.
(defvar helm-last-sources nil
"OBSOLETE!! Sources of previously invoked `helm'.")
(defvar helm-saved-current-source nil
"Value of the current source when the action list is shown.")
(defvar helm-compiled-sources nil
"Compiled version of `helm-sources'.")
(defvar helm-in-persistent-action nil
"Flag whether in persistent-action or not.")
(defvar helm-last-sources-local nil
"Buffer local value of `helm-sources'.")
(defvar helm-last-buffer nil
"`helm-buffer' of previously `helm' session.")
(defvar helm-execute-action-at-once-if-one nil
"Execute default action and exit when only one candidate is remaining.")
(defvar helm-quit-if-no-candidate nil
"Quit when there is no candidates when non--nil.
This variable accepts a function, which is executed if no candidate.")
(defvar helm-maybe-use-default-as-input nil
"Use :default arg of `helm' as input to update display.
Note that if also :input is specified as `helm' arg, it will take
precedence on :default.")
(defvar helm-source-in-each-line-flag nil
"Non-nil means add helm-source text-property in each candidate.
experimental feature.")
(defvar helm-debug-variables nil
"A list of helm variables to show in `helm-debug-output'.
Otherwise all variables started with `helm-' are shown.")
(defvar helm-debug-buffer "*Debug Helm Log*")
(defvar helm-debug nil
"If non-nil, write log message into `helm-debug-buffer' buffer.
If `debug-on-error' is non-nil, write log message regardless of this variable.
It is disabled by default because `helm-debug-buffer' grows quickly.")
;;; Internal Variables
;;
;;
(defvar helm-sources nil)
(defvar helm-delayed-init-executed nil)
(defvar helm-buffer "*helm*"
"Buffer showing completions.")
(defvar helm-current-buffer nil
"Current buffer when `helm' is invoked.")
(defvar helm-buffer-file-name nil
"Variable `buffer-file-name' when `helm' is invoked.")
(defvar helm-candidate-cache nil
"Holds the available candidate withing a single helm invocation.")
(defvar helm-pattern ""
"The input pattern used to update the helm buffer.")
(defvar helm-input ""
"The input typed in the candidates panel.")
(defvar helm-input-local nil
"Internal, store locally `helm-pattern' value for later use in `helm-resume'.")
(defvar helm-source-name nil)
(defvar helm-candidate-buffer-alist nil)
(defvar helm-match-hash (make-hash-table :test 'equal))
(defvar helm-cib-hash (make-hash-table :test 'equal))
(defvar helm-tick-hash (make-hash-table :test 'equal))
(defvar helm-issued-errors nil)
(defvar helm-follow-mode nil)
(defvar helm-let-variables nil)
(defvar helm-split-window-state nil)
(defvar helm-selection-point nil)
(defvar helm-alive-p nil)
(defvar helm-visible-mark-overlays nil)
(defconst helm-default-match-functions
(list (lambda (candidate)
(string-match helm-pattern candidate)))
"Default functions to match candidates according to `helm-pattern'.")
(defvar helm-update-blacklist-regexps '("^" "^ *" "$" "!" " " "\\b"
"\\<" "\\>" "\\<_" "\\>_"))
(defvar helm-suspend-update-flag nil)
(defvar helm-force-updating-p nil)
;; Utility: logging
(defun helm-log (format-string &rest args)
"Log message if `debug-on-error' or `helm-debug' is non-nil.
Messages are written to the `helm-debug-buffer' buffer.
Argument FORMAT-STRING is a string to use with `format'.
Use optional arguments ARGS like in `format'."
(when (or debug-on-error helm-debug)
(with-current-buffer (get-buffer-create helm-debug-buffer)
(buffer-disable-undo)
(set (make-local-variable 'inhibit-read-only) t)
(goto-char (point-max))
(insert (let ((tm (current-time)))
(format "%s.%06d (%s) %s\n"
(format-time-string "%H:%M:%S" tm)
(nth 2 tm)
(helm-log-get-current-function)
(apply #'format (cons format-string args))))))))
(defmacro helm-log-eval (&rest exprs)
"Write each EXPRS evaluation result to the `helm-debug-buffer'."
`(helm-log-eval-internal ',exprs))
(defun helm-log-run-hook (hook)
"Run HOOK like `run-hooks' but write these actions to helm log buffer."
(helm-log "executing %s" hook)
(when (boundp hook)
(helm-log-eval (symbol-value hook))
(helm-log-eval (default-value hook)))
(run-hooks hook)
(helm-log "executed %s" hook))
(defun helm-log-eval-internal (exprs)
"Eval EXPRS and write results to helm log buffer."
(dolist (expr exprs)
(condition-case err
;; Don't eval expression EXPR
;; when debugging is not turned on.
(when (or debug-on-error helm-debug)
(helm-log "%S = %S" expr (eval expr)))
(error (helm-log "%S = ERROR: %S" expr err)))))
(defun helm-log-get-current-function ()
"Get function name calling `helm-log'.
The original idea is from `tramp-debug-message'."
(loop with exclude-func-re = "^helm-\\(?:interpret\\|log\\|.*funcall\\)"
for btn from 1 to 40
for btf = (second (backtrace-frame btn))
for fn = (if (symbolp btf) (symbol-name btf) "")
if (and (string-match "^helm" fn)
(not (string-match exclude-func-re fn)))
return fn))
(defun helm-log-error (&rest args)
"Accumulate error messages into `helm-issued-errors'.
ARGS are args given to `format'."
(apply 'helm-log (concat "ERROR: " (car args)) (cdr args))
(let ((msg (apply 'format args)))
(unless (member msg helm-issued-errors)
(add-to-list 'helm-issued-errors msg))))
(defvar helm-debug-root-directory nil
"When non--nil, save helm log to `helm-last-log-file'.
Be aware that if you set that, you will end up with a huge directory
of log files, so use that only for debugging purpose.
See `helm-log-save-maybe' for more info.")
;; Internal
(defvar helm-last-log-file nil
"The name of the last helm session log file.")
(defun helm-log-save-maybe ()
"May be save log buffer to `helm-last-log-file'.
If `helm-debug-root-directory' is non--nil and a valid directory,
a directory named 'helm-debug-<date of today>'
will be created there and the log recorded in a file named
at the date and time of today in this directory."
(when (and (stringp helm-debug-root-directory)
(file-directory-p helm-debug-root-directory)
(or debug-on-error helm-debug))
(let ((logdir (expand-file-name (concat "helm-debug-"
(format-time-string "%Y%m%d"))
helm-debug-root-directory)))
(make-directory logdir t)
(with-current-buffer (get-buffer-create helm-debug-buffer)
(write-region (point-min) (point-max)
(setq helm-last-log-file
(expand-file-name
(format-time-string "%Y%m%d-%H%M%S")
logdir))
nil 'silent)
(kill-buffer)))))
;;;###autoload
(defun helm-open-last-log ()
"Open helm log file of last helm session.
If `helm-last-log-file' is nil, switch to `helm-debug-buffer' ."
(interactive)
(if helm-last-log-file
(view-file helm-last-log-file)
(switch-to-buffer helm-debug-buffer)))
(defun helm-print-error-messages ()
"Print error messages in `helm-issued-errors'."
(and helm-issued-errors
(message "%s" (mapconcat 'identity (reverse helm-issued-errors) "\n"))))
;; Programming Tools
(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-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)))
(defun helm-this-command ()
"Return the actual command in action.
Like `this-command' but return the real command,
not `exit-minibuffer' or unwanted functions."
(loop with bl = '(helm-exit-minibuffer
exit-minibuffer)
for count from 1 to 50
for btf = (backtrace-frame count)
for fn = (second btf)
if (and (commandp fn) (not (memq fn bl))) return fn
else
if (and (eq fn 'call-interactively)
(> (length btf) 2))
return (cadr (cdr btf))))
;; Helm API
(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) 'visible))
(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))
(defmacro with-helm-current-buffer (&rest body)
"Eval BODY inside `helm-current-buffer'."
(declare (indent 0) (debug t))
`(with-current-buffer helm-current-buffer
,@body))
(defmacro with-helm-restore-variables(&rest body)
"Restore `helm-restored-variables' after executing BODY."
(declare (indent 0) (debug t))
`(let ((orig-vars (mapcar (lambda (v)
(cons v (symbol-value v)))
helm-restored-variables)))
(unwind-protect (progn ,@body)
(loop for (var . value) in orig-vars
do (set var value))
(helm-log "restore variables"))))
(defmacro with-helm-default-directory (directory &rest body)
(declare (indent 2) (debug t))
`(let ((default-directory (file-name-as-directory ,directory)))
,@body))
(defmacro with-helm-after-update-hook (&rest body)
"Execute BODY at end of `helm-update'."
(declare (indent 0) (debug t))
(let ((fun (gensym "helm-hook")))
`(progn
(defun ,fun ()
(unwind-protect
(progn ,@body)
(remove-hook 'helm-after-update-hook (quote ,fun))))
(add-hook 'helm-after-update-hook (quote ,fun)))))
(defun* helm-attr (attribute-name
&optional (src (helm-get-current-source)) compute)
"Get the value of ATTRIBUTE-NAME of SRC.
If SRC is omitted, use current source.
If COMPUTE is non--nil compute value of ATTRIBUTE-NAME
with `helm-interpret-value'."
(helm-aif (assq attribute-name src)
(if compute (helm-interpret-value (cdr it)) (cdr it))))
(defun* helm-attr-defined (attribute-name
&optional (src (helm-get-current-source)))
"Return non-nil if ATTRIBUTE-NAME of SRC is defined.
if SRC is omitted, use current source."
(and (assq attribute-name src) t))
(defun* helm-attrset (attribute-name value
&optional
(src (helm-get-current-source)))
"Set the value of ATTRIBUTE-NAME of source SRC to VALUE.
If ATTRIBUTE-NAME doesn't exists in source it is created with value VALUE.
If SRC is omitted, use current source."
(helm-aif (assq attribute-name src)
(setcdr it value)
(setcdr src (cons (cons attribute-name value) (cdr src))))
value)
(defun helm-get-attribute-from-source-type (attribute source)
"Get ATTRIBUTE from type attribute of SOURCE."
(when (assq 'type source)
(assq attribute
(assq (helm-attr 'type source)
helm-type-attributes))))
(defun helm-get-attribute-from-type (attribute type)
"Get ATTRIBUTE from TYPE.
arg TYPE is an existing type defined in `helm-type-attributes'."
(assq attribute (assq type helm-type-attributes)))
(defun helm-get-actions-from-type (source)
"Get actions list from type attribute of SOURCE."
(when (assq 'type source)
(helm-get-attribute-from-source-type 'action source)))
(defun helm-inherit-attribute-from-source (attribute source)
"Get the ATTRIBUTE of SOURCE."
(helm-aif (assq attribute source)
it
(helm-get-attribute-from-source-type attribute source)))
(defun helm-append-at-nth (seq elm index)
"Append ELM at INDEX in SEQ."
(loop for i in seq
for count from 1 collect i
when (= count index)
if (listp elm) append elm
else collect elm))
(defun helm-add-action-to-source (name fn source &optional index)
"Add new action NAME linked to function FN to SOURCE.
Function FN should be a valid function that take one arg i.e candidate,
argument NAME is a string that will appear in action menu
and SOURCE should be an existing helm source already loaded.
If INDEX is specified, action is added in action list at INDEX,
otherwise it is added at end.
This allow user to add a specific action to an existing source
without modifying source code."
(let ((actions (helm-attr 'action source))
(new-action (list (cons name fn))))
(when (symbolp actions)
(setq actions (list (cons "Default action" actions))))
(helm-attrset 'action
(if index
(helm-append-at-nth actions new-action index)
(append actions new-action))
source)))
(defun* helm-add-action-to-source-if (name fn source predicate
&optional (index 4) test-only)
"Add new action NAME linked to function FN to SOURCE.
Action is added only if current candidate match PREDICATE.
This function add an entry in the `action-transformer' attribute
of SOURCE (or create one if not found).
Function PREDICATE should take one arg candidate.
Function FN should be a valid function that take one arg i.e candidate,
argument NAME is a string that will appear in action menu
and SOURCE should be an existing helm source already loaded.
If INDEX is specified, action is added in action list at INDEX.
Value of INDEX should be always >=1, default to 4.
This allow user to add a specific `action-tranformer'
to an existing source without modifying source code.
E.g
Add the action \"Byte compile file async\" linked to
function 'async-byte-compile-file to source `helm-c-source-find-files'
only when predicate helm-ff-candidates-lisp-p return non--nil:
\(helm-add-action-to-source-if \"Byte compile file async\"
'async-byte-compile-file
helm-c-source-find-files
'helm-ff-candidates-lisp-p\)."
(let* ((actions (helm-attr 'action source))
(action-transformers (helm-attr 'action-transformer source))
(new-action (list (cons name fn)))
(transformer `(lambda (actions candidate)
(cond ((funcall (quote ,predicate) candidate)
(helm-append-at-nth
actions (quote ,new-action) ,index))
(t actions)))))
(when (symbolp actions)
(helm-attrset 'action (list (cons "Default action" actions)) source))
(when (symbolp action-transformers)
(setq action-transformers (list action-transformers)))
(if test-only ; debug
(delq nil (append (list transformer) action-transformers))
(helm-attrset 'action-transformer
(delq nil (append (list transformer) action-transformers))
source))))
(defun helm-set-source-filter (sources)
"Set the value of `helm-source-filter' to SOURCES and update.
This function sets a filter for helm sources and it may be
called while helm is running. It can be used to toggle
displaying of sources dinamically. For example, additional keys
can be bound into `helm-map' to display only the file-related
results if there are too many matches from other sources and
you're after files only:
Shift+F shows only file results from some sources:
\(define-key helm-map \"F\" 'helm-my-show-files-only)
\(defun helm-my-show-files-only ()
(interactive)
(helm-set-source-filter '(\"File Name History\"
\"Files from Current Directory\")))
Shift+A shows all results:
\(define-key helm-map \"A\" 'helm-my-show-all)
\(defun helm-my-show-all ()
(interactive)
(helm-set-source-filter nil))
The -my- part is added to avoid collisions with
existing Helm function names."
(unless (and (listp sources)
(loop for name in sources always (stringp name)))
(error "Invalid data in `helm-set-source-filter': %S" sources))
(let ((cur-disp-sel (with-current-buffer helm-buffer
(helm-get-selection nil t))))
(setq helm-source-filter sources)
(helm-log-eval helm-source-filter)
(helm-update cur-disp-sel)))
(defun helm-set-sources (sources &optional no-init no-update)
"Set SOURCES during `helm' invocation.
If NO-INIT is non-nil, skip executing init functions of SOURCES.
If NO-UPDATE is non-nil, skip executing `helm-update'."
(with-current-buffer helm-buffer
(setq helm-compiled-sources nil
helm-sources sources
helm-last-sources-local sources)
(helm-log-eval helm-compiled-sources helm-sources))
(unless no-init (helm-funcall-foreach 'init))
(unless no-update (helm-update)))
(defvar helm-compile-source-functions
'(helm-compile-source--type
helm-compile-source--dummy
helm-compile-source--candidates-in-buffer)
"Functions to compile elements of `helm-sources' (plug-in).")
(defun helm-get-sources ()
"Return compiled `helm-sources', which is memoized.
Attributes:
- type
`helm-type-attributes' are merged in.
- candidates-buffer
candidates, volatile and match attribute are created."
(cond
;; action
((helm-action-window)
helm-sources)
;; memoized
(helm-compiled-sources)
;; first time
(t
(prog1
(setq helm-compiled-sources
(helm-compile-sources
helm-sources helm-compile-source-functions))
(helm-log-eval helm-compiled-sources)))))
(defun* helm-get-selection (&optional (buffer nil buffer-s)
force-display-part)
"Return the currently selected item or nil.
if BUFFER is nil or unspecified, use helm-buffer as default value.
If FORCE-DISPLAY-PART is non-nil, return the display string.
If FORCE-DISPLAY-PART value is 'withprop the display string is returned
with its properties."
(setq buffer (if (and buffer buffer-s) buffer helm-buffer))
(unless (helm-empty-buffer-p buffer)
(with-current-buffer buffer
(let* ((disp-fn (if (eq force-display-part 'withprop)
'buffer-substring
'buffer-substring-no-properties))