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(require 'projectile)

(setq projectile-switch-project-action 'projectile-commander
      projectile-find-dir-includes-top-level t
      projectile-use-git-grep t)

(defun km/projectile-switch-project-to-file ()
  "Provide access to the of default `projectile-find-file'.

I have set `projectile-switch-project-action' to
`projectile-commander' but would still like quick access to
`projectile-find-file'."
  (interactive)
  (let ((projectile-switch-project-action 'projectile-find-file))
    (projectile-switch-project)))

(defun km/projectile-open-external-terminal-in-root ()
  "Run `km/open-external-terminal' in project root."
  (interactive)
  (let ((default-directory (projectile-project-root)))
    (km/open-external-terminal)))

(defun km/projectile-view-file ()
  "View project file.
Interactive arguments are processed according to
`projectile-find-file'."
  (interactive)
  (call-interactively 'projectile-find-file)
  (view-mode 1))

(defun km/projectile-view-file-other-window ()
  "View project file in other window.
Interactive arguments are processed according to
`projectile-find-file-other-window'."
  (interactive)
  (call-interactively 'projectile-find-file-other-window)
  (view-mode 1))

(defun km/project-filename-at-point ()
  "Return file name relative to `projectile-project-root'."
  (--when-let (thing-at-point 'filename)
    (file-relative-name it (projectile-project-root))))

(defun km/projectile-copy-project-filename-as-kill ()
  (interactive)
  (let ((fname (km/project-filename-at-point)))
    (if (eq last-command 'kill-region)
        (kill-append fname nil)
      (kill-new fname))
    (message "%s" fname)))

(defvar km/projectile-project-saved-thing nil
  "Property list of saved thing for projects.
The keys are project roots (strings), so use `lax-plist-put' and
`lax-plist-get'.")

(defun km/projectile-save-thing (thing)
  "Save thing for current project.

Thing is a character representing
-  . point marker
- (b)uffer
- (f)ile
- (w)indow configuration

- (d)elete saved thing"
  (interactive (list
                (let ((letters '(?. ?b ?f ?w ?d)))
                  (read-char-choice (concat "Save [" letters "]: ")
                                    letters))))
  (let ((value (cl-case thing
                 (?.
                  (point-marker))
                 (?b
                  (current-buffer))
                 (?f
                  (buffer-file-name))
                 (?w
                  (current-window-configuration))
                 (?d nil))))
    (setq km/projectile-project-saved-thing
          (lax-plist-put km/projectile-project-saved-thing
                         (projectile-project-root)
                         (cons thing value)))))

(defun km/projectile-restore-thing ()
  "Restore saved thing for current project.
Return nil if there is no thing saved for the current project."
  (interactive)
  (-when-let* ((thing-value (lax-plist-get km/projectile-project-saved-thing
                                           (projectile-project-root)))
               (thing (car thing-value))
               (value (cdr thing-value)))
    (cl-case thing
      (?.
       (-if-let (buf (marker-buffer value))
           (progn (switch-to-buffer buf)
                  (goto-char value))
          (user-error "Buffer no longer exists")))
      (?b
       (if (buffer-live-p value)
           (switch-to-buffer value)
         (user-error "Buffer no longer exists")))
      (?f
       (find-file value))
      (?w
       (set-window-configuration value)))
    t))

(define-key projectile-command-map (kbd "4 v")
  'km/projectile-view-file-other-window)

(define-key projectile-command-map "."
  'km/projectile-copy-project-filename-as-kill)
(define-key projectile-command-map "e" 'km/projectile-restore-thing)
;; This overrides `projectile-find-file-dwim'.
(define-key projectile-command-map "g" 'projectile-vc)
;; Swap `projectile-invalidate-cache' and `projectile-ibuffer'.
(define-key projectile-command-map "I" 'projectile-invalidate-cache)
(define-key projectile-command-map "i" 'projectile-ibuffer)
(define-key projectile-command-map "q" 'projectile-replace)
;; This overrides `projectile-replace', which is now on 'q'.
(define-key projectile-command-map "r" 'projectile-recentf)
;; This overrides Projectile's general search prefix.
(define-key projectile-command-map "s" 'projectile-grep)
;; This overrides `projectile-vc', which is now on 'g'.
(define-key projectile-command-map "v" 'km/projectile-view-file)
(define-key projectile-command-map "w" 'km/projectile-save-thing)

(key-chord-define-global "jq" 'projectile-commander)
(key-chord-define-global "gp" 'projectile-switch-project)

(define-prefix-command 'km/projectile-ctl-x-4-map)
(define-key ctl-x-4-map "p" 'km/projectile-ctl-x-4-map)

(define-key km/projectile-ctl-x-4-map (kbd "C-o")
  'projectile-display-buffer)
(define-key km/projectile-ctl-x-4-map "b"
  'projectile-switch-to-buffer-other-window)
(define-key km/projectile-ctl-x-4-map "d"
  'projectile-find-dir-other-window)
(define-key km/projectile-ctl-x-4-map "f"
  'projectile-find-file-other-window)
(define-key km/projectile-ctl-x-4-map "t"
  'projectile-find-implementation-or-test-other-window)
(define-key km/projectile-ctl-x-4-map "v"
  'km/projectile-view-file-other-window)


;;; Commander methods

(def-projectile-commander-method ?B
  "Find project buffer in other window."
  (call-interactively 'projectile-switch-to-buffer-other-window))

(def-projectile-commander-method ?c
  "Run project compilation command."
  (call-interactively 'projectile-compile-project))

(def-projectile-commander-method ?D
  "Find a project directory in other window."
  (call-interactively 'projectile-find-dir-other-window))

(def-projectile-commander-method ?e
  "Restore saved thing."
  (km/projectile-restore-thing))

(def-projectile-commander-method ?F
  "Find project file in other window."
  (call-interactively 'projectile-find-file-other-window))

(def-projectile-commander-method ?g
  "Open project root in vc-dir or magit."
  (projectile-vc))

(def-projectile-commander-method ?i
  "Open an IBuffer window showing all buffers in the current project."
  (call-interactively 'projectile-ibuffer))

(def-projectile-commander-method ?O
  "Display a project buffer in other window."
  (call-interactively 'projectile-display-buffer))

(def-projectile-commander-method ?r
  "Find recently visited file in project."
  (projectile-recentf))

(def-projectile-commander-method ?s
  "Run grep on project."
  (call-interactively #'projectile-grep))

(def-projectile-commander-method ?t
  "Open project root in dired."
  (projectile-dired))

(def-projectile-commander-method ?v
  "View project file."
  (km/projectile-view-file))

(def-projectile-commander-method ?V
  "View project file in other window."
  (km/projectile-view-file-other-window))

(def-projectile-commander-method ?w
  "Save thing."
  (call-interactively #'km/projectile-save-thing))

(projectile-global-mode)

(provide 'init-projectile)