emacs.d/lisp/setup-helm.el

(require-package 'helm)
;; https://github.com/emacs-helm/helm/commit/e81fbbc687705595ab65ae5cd3bdf93c17a90743
;;(require 'helm-config)
(require 'helm-grep)

;; The default "C-x c" is quite close to "C-x C-c", which quits Emacs.
;; Changed to "C-c h". Note: We must set "C-c h" globally, because we
;; cannot change `helm-command-prefix-key' once `helm-config' is loaded.
(global-set-key (kbd "C-c h") 'helm-command-prefix)
(global-unset-key (kbd "C-x c"))

(define-key helm-map (kbd "<tab>") 'helm-execute-persistent-action) ; rebihnd tab to do persistent action
(define-key helm-map (kbd "C-i") 'helm-execute-persistent-action) ; make TAB works in terminal
(define-key helm-map (kbd "C-z")  'helm-select-action) ; list actions using C-z

(define-key helm-grep-mode-map (kbd "<return>")  'helm-grep-mode-jump-other-window)
(define-key helm-grep-mode-map (kbd "n")  'helm-grep-mode-jump-other-window-forward)
(define-key helm-grep-mode-map (kbd "p")  'helm-grep-mode-jump-other-window-backward)

(when (executable-find "curl")
  (setq helm-google-suggest-use-curl-p t))

(setq
 helm-scroll-amount 4 ; scroll 4 lines other window using M-<next>/M-<prior>
 helm-ff-search-library-in-sexp t ; search for library in `require' and `declare-function' sexp.
 helm-split-window-in-side-p t ;; open helm buffer inside current window, not occupy whole other window
 helm-candidate-number-limit 500 ; limit the number of displayed canidates
 helm-ff-file-name-history-use-recentf t
 helm-move-to-line-cycle-in-source t ; move to end or beginning of source when reaching top or bottom of source.
 helm-buffers-fuzzy-matching t          ; fuzzy matching buffer names when non-nil
                                        ; useful in helm-mini that lists buffers

 )

(add-to-list 'helm-sources-using-default-as-input 'helm-source-man-pages)

(global-set-key (kbd "M-x") 'helm-M-x)
(global-set-key (kbd "M-y") 'helm-show-kill-ring)
(global-set-key (kbd "C-x b") 'helm-mini)
(global-set-key (kbd "C-x C-f") 'helm-find-files)
(global-set-key (kbd "C-h SPC") 'helm-all-mark-rings)
(global-set-key (kbd "C-c h o") 'helm-occur)

(global-set-key (kbd "C-c h C-c w") 'helm-wikipedia-suggest)

(global-set-key (kbd "C-c h x") 'helm-register)
;; (global-set-key (kbd "C-x r j") 'jump-to-register)

(define-key 'help-command (kbd "C-f") 'helm-apropos)
(define-key 'help-command (kbd "r") 'helm-info-emacs)
(define-key 'help-command (kbd "C-l") 'helm-locate-library)

;; use helm to list eshell history
(add-hook 'eshell-mode-hook
          #'(lambda ()
              (define-key eshell-mode-map (kbd "M-l")  'helm-eshell-history)))

;;; Save current position to mark ring
(add-hook 'helm-goto-line-before-hook 'helm-save-current-pos-to-mark-ring)

;; show minibuffer history with Helm
(define-key minibuffer-local-map (kbd "M-p") 'helm-minibuffer-history)
(define-key minibuffer-local-map (kbd "M-n") 'helm-minibuffer-history)

(define-key global-map [remap find-tag] 'helm-etags-select)

(define-key global-map [remap list-buffers] 'helm-buffers-list)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; PACKAGE: helm-swoop                ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(require-package 'helm-swoop)
;; Locate the helm-swoop folder to your path
(require 'helm-swoop)

;; Change the keybinds to whatever you like :)
(global-set-key (kbd "C-c h o") 'helm-swoop)
(global-set-key (kbd "C-c s") 'helm-multi-swoop-all)

;; When doing isearch, hand the word over to helm-swoop
(define-key isearch-mode-map (kbd "M-i") 'helm-swoop-from-isearch)

;; From helm-swoop to helm-multi-swoop-all
(define-key helm-swoop-map (kbd "M-i") 'helm-multi-swoop-all-from-helm-swoop)

;; Save buffer when helm-multi-swoop-edit complete
(setq helm-multi-swoop-edit-save t)

;; If this value is t, split window inside the current window
(setq helm-swoop-split-with-multiple-windows t)

;; Split direcion. 'split-window-vertically or 'split-window-horizontally
(setq helm-swoop-split-direction 'split-window-vertically)

;; If nil, you can slightly boost invoke speed in exchange for text color
(setq helm-swoop-speed-or-color t)

(helm-mode 1)

(provide 'setup-helm)