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;;; evil-collection-helm.el --- Evil bindings for Helm -*- lexical-binding: t -*-
;; Copyright (C) 2017 Pierre Neidhardt
;; Author: Pierre Neidhardt <mail@ambrevar.xyz>
;; Maintainer: James Nguyen <james@jojojames.com>
;; Pierre Neidhardt <mail@ambrevar.xyz>
;; URL: https://github.com/emacs-evil/evil-collection
;; Version: 0.0.1
;; Package-Requires: ((emacs "25.1"))
;; Keywords: evil, helm, tools
;; This file 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, or (at your
;; option) any later version.
;;
;; This file 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.
;;
;; For a full copy of the GNU General Public License
;; see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Evil bindings for Helm.
;;; Code:
(require 'evil-collection)
(require 'helm-files nil t) ; TODO: Check if this is the ideal requirement and if we are not loading too much.
;; To navigate Helm entries with <hjkl> in insert state, we need a modifier.
;; Using the C- modifier would conflict with the help prefix "C-h". So we use
;; M- prefixed bindings instead.
;; Helm-find-files: We cannot use "h" and "l" in normal state to navigate up and
;; down the file system hierarchy since we need them to use it to edit the
;; minibuffer content.
(defvar helm-map)
(defvar helm-find-files-map)
(defvar helm-generic-files-map)
(defvar helm-buffer-map)
(defvar helm-moccur-map)
(defvar helm-grep-map)
(defvar helm-read-file-map)
(defvar helm-echo-input-in-header-line)
(defvar helm--prompt)
(defvar helm--action-prompt)
(defvar helm-header-line-space-before-prompt)
(defvar helm-default-prompt-display-function)
(declare-function helm-window "helm-lib")
(defconst evil-collection-helm-maps '(help-map
help-find-files-map
helm-read-file-map
helm-generic-files-map
helm-buffer-map
helm-moccur-map
helm-grep-map))
;; From https://github.com/emacs-helm/helm/issues/362.
;; Also see https://emacs.stackexchange.com/questions/17058/change-cursor-type-in-helm-header-line#17097.
;; TODO: With Evil, the cursor type is not right in the header line and the evil
;; cursor remains in the minibuffer. Visual selections also reveal overlayed
;; text.
(with-no-warnings
(defun evil-collection-helm-hide-minibuffer-maybe ()
"Hide text in minibuffer when `helm-echo-input-in-header-line' is non-nil."
(when (with-current-buffer (helm-buffer-get) helm-echo-input-in-header-line)
(let ((ov (make-overlay (point-min) (point-max) nil nil t)))
(overlay-put ov 'window (selected-window))
(overlay-put ov 'face (let ((bg-color (face-background 'default nil)))
`(:background ,bg-color :foreground ,bg-color)))
(setq-local cursor-type nil)))))
(defun evil-collection-helm--set-prompt-display (pos)
(let (beg state region-active m)
(with-selected-window (minibuffer-window)
(setq beg (save-excursion (vertical-motion 0 (helm-window)) (point))
state evil-state
region-active (region-active-p)
m (mark t)))
(when region-active
(setq m (- m beg))
;; Increment pos to handle the space before prompt (i.e `pref').
(put-text-property (1+ (min m pos)) (+ 2 (max m pos))
'face
(list :background (face-background 'region))
header-line-format))
(put-text-property
;; Increment pos to handle the space before prompt (i.e `pref').
(+ 1 pos) (+ 2 pos)
'face
(if (eq state 'insert)
'underline
;; Don't just use 'cursor, this can hide the current character.
(list :inverse-video t
:foreground (face-background 'cursor)
:background (face-background 'default)))
header-line-format)))
(defun evil-collection-helm-setup ()
"Set up `evil' bindings for `helm'."
(add-hook 'helm-minibuffer-set-up-hook 'evil-collection-helm-hide-minibuffer-maybe)
(setq helm-default-prompt-display-function 'evil-collection-helm--set-prompt-display)
(evil-collection-define-key '(insert normal) 'helm-map
(kbd "M-[") 'helm-previous-source
(kbd "M-]") 'helm-next-source
(kbd "M-l") 'helm-execute-persistent-action
(kbd "M-j") 'helm-next-line
(kbd "M-k") 'helm-previous-line
(kbd "C-f") 'helm-next-page
(kbd "C-b") 'helm-previous-page)
(dolist (map '(helm-find-files-map helm-read-file-map))
(evil-collection-define-key 'normal map
"go" 'helm-ff-run-switch-other-window
"/" 'helm-ff-run-find-sh-command)
(evil-collection-define-key '(insert normal) map
(kbd "S-<return>") 'helm-ff-run-switch-other-window
(kbd "M-h") 'helm-find-files-up-one-level))
;; TODO: Change the Helm header to display "M-l" instead of "C-l". We don't
;; want to modify the Emacs Helm map.
(evil-collection-define-key '(insert normal) 'helm-generic-files-map
(kbd "S-<return>") 'helm-ff-run-switch-other-window)
(evil-collection-define-key '(insert normal) 'helm-buffer-map
(kbd "S-<return>") 'helm-buffer-switch-other-window
(kbd "M-<return>") 'display-buffer)
(evil-collection-define-key '(insert normal) 'helm-moccur-map
(kbd "S-<return>") 'helm-moccur-run-goto-line-ow)
(evil-collection-define-key '(insert normal) 'helm-grep-map
(kbd "S-<return>") 'helm-grep-run-other-window-action)
(evil-collection-define-key 'normal 'helm-generic-files-map
"go" 'helm-ff-run-switch-other-window)
(evil-collection-define-key 'normal 'helm-buffer-map
"go" 'helm-buffer-switch-other-window
"gO" 'display-buffer
"=" 'helm-buffer-run-ediff
"%" 'helm-buffer-run-query-replace-regexp
"D" 'helm-buffer-run-kill-persistent ; Ivy has "D".
)
(evil-collection-define-key 'normal 'helm-moccur-map
"go" 'helm-moccur-run-goto-line-ow)
(evil-collection-define-key 'normal 'helm-grep-map
"go" 'helm-grep-run-other-window-action)
(evil-collection-define-key 'normal 'helm-find-files-map
"=" 'helm-ff-run-ediff-file
"%" 'helm-ff-run-query-replace-regexp
"D" 'helm-ff-run-delete-file) ; Ivy has "D".
;; These helm bindings should always exist, the evil equivalents do
;; nothing useful in the minibuffer (error or pure failure).
;; RET can't do a second line in the minibuffer.
;; The C-n/C-p completions error with 'helm in helm' session.
;; C-o switches to evil state (again, not useful).
(evil-collection-define-key '(insert normal) 'helm-map
(kbd "RET") 'helm-maybe-exit-minibuffer
(kbd "M-v") 'helm-previous-page
(kbd "C-v") 'helm-next-page
(kbd "C-p") 'helm-previous-line
(kbd "C-n") 'helm-next-line
(kbd "C-o") 'helm-next-source)
(when evil-want-C-u-scroll
(evil-collection-define-key 'normal 'helm-map
(kbd "C-u") 'helm-previous-page))
(when evil-want-C-d-scroll
(evil-collection-define-key 'normal 'helm-map
(kbd "C-d") 'helm-next-page))
(evil-collection-define-key 'normal 'helm-map
(kbd "<tab>") 'helm-select-action ; TODO: Ivy has "ga".
(kbd "[") 'helm-previous-source
(kbd "]") 'helm-next-source
"gk" 'helm-previous-source
"gj" 'helm-next-source
(kbd "(") 'helm-prev-visible-mark
(kbd ")") 'helm-next-visible-mark
"j" 'helm-next-line
"k" 'helm-previous-line
"gg" 'helm-beginning-of-buffer
"G" 'helm-end-of-buffer
"/" 'helm-quit-and-find-file
;; refresh
"gr" 'helm-refresh
"yp" 'helm-yank-selection
"yP" 'helm-copy-to-buffer
"yy" 'helm-kill-selection-and-quit
(kbd "SPC") 'helm-toggle-visible-mark))
(provide 'evil-collection-helm)
;;; evil-collection-helm.el ends here
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