Álvaro Ramírez

19 August 2017 Projectile shell dir company completion

Projectile and company are just amazing Emacs packages. Projectile gives random access to files, while company completes well… anything. For shells, Emacs has a handful of options.

Standing on the shoulders of package giants (dash and f included) and some elisp, we can bring random access to project directories from the shell.

(require 'cl-lib)
(require 'company)
(require 'dash)
(require 'f)
(require 'projectile)

(defvar-local company-projectile-cd-prefix "cd ")

(defun company-projectile-cd (command &optional arg &rest ignored)
  "Company shell completion for any projectile path."
  (interactive (list 'interactive))
  (case command
    (interactive (company-begin-backend 'company-projectile-cd))
    (prefix
     (company-grab-symbol-cons company-projectile-cd-prefix
                               (length company-projectile-cd-prefix)))
    (candidates
     (company-projectile-cd--candidates
      (company-grab-symbol-cons company-projectile-cd-prefix
                                (length company-projectile-cd-prefix))))
    (post-completion
     (company-projectile-cd--expand-inserted-path arg))))

(defun company-projectile-cd--candidates (input)
  "Return candidates for given INPUT."
  (company-projectile-cd--reset-root)
  (when (consp input)
    (let ((search-term (substring-no-properties
                        (car input) 0 (length (car input))))
          (prefix-found (cdr input)))
      (when prefix-found
        (if (projectile-project-p)
            (company-projectile-cd--projectile search-term)
          (company-projectile-cd--find-fallback search-term))))))

(defun company-projectile-cd--projectile (search-term)
  (-filter (lambda (path)
             (string-match-p (regexp-quote
                              search-term)
                             path))
           (-snoc
            (projectile-current-project-dirs)
            ;; Throw project root in there also.
            (projectile-project-root))))

(defun company-projectile-cd--find-fallback (search-term)
  (ignore-errors
    (-map (lambda (path)
            (string-remove-prefix "./" path))
          (apply #'process-lines
                 (list "find" "." "-type" "d"  "-maxdepth" "2" "-iname"
                       (format "\*%s\*" search-term))))))

(defun company-projectile-cd--expand-inserted-path (path)
  "Replace relative PATH insertion with its absolute equivalent if needed."
  (unless (f-exists-p path)
    (delete-region (point) (- (point) (length path)))
    (insert (concat (projectile-project-root) path))))

(defun company-projectile-cd--reset-root ()
  "Reset project root. Useful when cd'ing in and out of projects."
  (projectile-reset-cached-project-root)
  (when (projectile-project-p)
    (projectile-project-root)))

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