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voicemacs-extend-helm.el
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voicemacs-extend-helm.el
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(require 'helm)
(require 'voicemacs-base)
;; TODO: Maybe check the nature of the current buffer? This seems janky.
;;
;; (eq (current-buffer)
;; (with-helm-buffer (ignore-errors
;; (current-buffer))))
(voicemacs-define-sync-change-buffer in-helm-prompt
:update (bound-and-true-p helm-alive-p)
:defer nil)
;; The minibuffer prompt for the current helm session
;; (voicemacs-define-sync-change-buffer helm-prompt-text
;; :update (and (bound-and-true-p helm-alive-p) helm--prompt)
;; :defer nil)
;; The name of the current helm buffer
(voicemacs-define-sync-change-buffer helm-buffer-name
:update (and (bound-and-true-p helm-alive-p)
helm-last-buffer)
:defer nil)
;; Hacky. Might not work.
(voicemacs-define-sync-change-buffer helm-title
:update (when (bound-and-true-p helm-alive-p)
(with-helm-buffer
(buffer-substring-no-properties (line-beginning-position 0)
(line-end-position 0))))
:defer nil)
(defun voicemacs--helm-line-number ()
"Line number of the current candidate."
(with-helm-buffer (line-number-at-pos)))
(defun voicemacs-helm-goto-line (line &optional do-not-restore)
"Go to the candidate on `line'.
`do-not-restore' is used for internal purposes. It suppresses
infinite loops on a recursive call."
;; TODO: This structure is gross. Rewrite it.
(let ((start-line (voicemacs--helm-line-number)))
(helm-beginning-of-buffer)
(let ((last-line (voicemacs--helm-line-number)))
(while (< (voicemacs--helm-line-number) line)
(helm-next-line)
(when (= (voicemacs--helm-line-number) last-line)
;; No more candidates - restore original selection.
(unless do-not-restore
(voicemacs-helm-goto-line start-line t))
(error "Candidate does not exist"))
(setq last-line (voicemacs--helm-line-number)))))
;; Redisplay & pause so the user can see we moved the selection.
(redisplay t)
(sit-for 0.1))
;; TODO: Only expose this while minor mode active?
(voicemacs-expose-function 'voicemacs-helm-goto-line)
(defun voicemacs--local-override-face (face &rest overrides)
"Override a face in the current buffer only."
(setq-local face-remapping-alist
(cons `(,face ,@overrides)
;; Remove any overrides for this face that already exist.
(-filter (lambda (mapping)
(not (eq (car mapping) face)))
face-remapping-alist))))
(defun voicemacs--enable-selection-line-numbers (&rest _)
"Make the current buffer show bold, absolute line numbers.
These numbers can be used for selection."
;; Default line numbers are subtle. These are selection numbers, make them
;; stand out.
;;
;; TODO: Extract line numbers face?
;;
;; FIXME: `bold' will override the color in some themes, e.g. `leuven'
;; (voicemacs--local-override-face 'line-number 'bold 'font-lock-keyword-face)
(voicemacs--local-override-face 'line-number 'helm-bookmark-directory)
;; (voicemacs--local-override-face 'line-number-current-line
;; 'bold
;; 'helm-selection
;; 'font-lock-keyword-face)
(voicemacs--local-override-face 'line-number-current-line
'helm-selection
'helm-bookmark-directory)
(setq-local display-line-numbers 'absolute))
(defun voicemacs--show-helm-numbers ()
(when helm-alive-p
(with-helm-buffer
(voicemacs--enable-selection-line-numbers))))
(defun voicemacs--helm-numbers-mode-setup ()
(cl-assert (boundp 'display-line-numbers) nil
"`display-line-numbers' not available")
(add-hook 'helm-update-hook 'voicemacs--show-helm-numbers))
(defun voicemacs--helm-numbers-mode-teardown ()
(remove-hook 'helm-update-hook 'voicemacs--show-helm-numbers)
;; Also disable any active numbers
(when helm-alive-p
(with-helm-buffer
(setq-local display-line-numbers nil))))
(define-minor-mode voicemacs-helm-numbers-mode
"When active, helm will number candidates with absolute line numbers.
Incompatible with `helm-display-line-numbers-mode'."
:group 'voicemacs
:global t
:lighter nil
:after-hook (if voicemacs-helm-numbers-mode
(voicemacs--helm-numbers-mode-setup)
(voicemacs--helm-numbers-mode-teardown)))
;; TODO: System for enabling by default?
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; TODO: Maybe make a generalised function to invoke nonblocking RPC calls
(defun voicemacs-helm-swoop (query)
"Run `helm-swoop' with a specific `query' on a timer.
Allows helm-swoop to be invoked via RPC without blocking."
;; Type check because it's delayed.
(assert (stringp query))
(run-with-timer 0 nil 'helm-swoop :query query))
(voicemacs-expose-function 'voicemacs-helm-swoop)
(defun voicemacs-helm-submit-if-single-match ()
"Submit the match if only one exists."
;; Ensure matches are updated
(when (helm--updating-p)
(helm-refresh))
;; TODO: How to get currently matching candidates?
(helm-candidate-number-limit)
(helm-confirm-and-exit-minibuffer)
)
(provide 'voicemacs-extend-helm)
;;; voicemacs-extend-helm.el ends here.