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;;; helm-fd.el --- helm interface for fd command line tool. -*- lexical-binding: t -*-
;; Copyright (C) 2012 ~ 2025 Thierry Volpiatto
;; This program 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 of the License, or
;; (at your option) any later version.
;; This program 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.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'helm)
(require 'helm-types)
(declare-function ansi-color-apply "ansi-color.el")
(declare-function split-string-shell-command "shell.el")
(defvar helm-fd-executable "fd"
"The fd shell command executable.")
(defcustom helm-fd-switches '("--no-ignore" "--hidden" "--type" "f" "--type" "d" "--color" "always")
"A list of options to pass to fd shell command."
:type '(repeat string)
:group 'helm-files)
(defcustom helm-fd-mode-line-function 'helm-fd-default-mode-line
"Function called when `fd' process is finished to format mode-line."
:type 'function
:group 'helm-files)
(defface helm-fd-finish
`((t ,@(and (>= emacs-major-version 27) '(:extend t))
:foreground "green"))
"Face used in mode line when fd process ends."
:group 'helm-grep-faces)
(defvar helm-fd-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map helm-generic-files-map)
(define-key map (kbd "C-]") 'undefined)
(define-key map (kbd "DEL") 'helm-delete-backward-no-update)
(define-key map (kbd "M-<down>") 'helm-fd-next-directory)
(define-key map (kbd "M-<up>") 'helm-fd-previous-directory)
map))
(defun helm-fd-next-directory-1 (arg)
(with-helm-window
(let ((cur-dir (helm-basedir (helm-get-selection))))
(while (equal cur-dir (helm-basedir (helm-get-selection)))
(if (> arg 0)
(helm-next-line)
(helm-previous-line))))))
(defun helm-fd-next-directory ()
"Move to next directory in a helm-fd source."
(interactive)
(with-helm-alive-p
(helm-fd-next-directory-1 1)))
(defun helm-fd-previous-directory ()
"Move to previous directory in a helm-fd source."
(interactive)
(with-helm-alive-p
(helm-fd-next-directory-1 -1)))
(defclass helm-fd-class (helm-source-async)
((candidates-process :initform 'helm-fd-process)
(requires-pattern :initform 2)
(candidate-number-limit :initform 20000)
(nohighlight :initform t)
(help-message :initform 'helm-fd-help-message)
(filtered-candidate-transformer :initform 'helm-fd-fct)
(action :initform 'helm-type-file-actions)
(keymap :initform 'helm-fd-map)))
(defun helm-fd-process ()
"Initialize fd process in an helm async source."
(let* (process-connection-type
(cmd (append helm-fd-switches
(or (and (fboundp #'split-string-shell-command)
(split-string-shell-command helm-pattern))
(split-string helm-pattern))))
(proc (apply #'start-process "fd" nil helm-fd-executable cmd))
(start-time (float-time))
(fd-version (replace-regexp-in-string
"\n" ""
(shell-command-to-string
(concat helm-fd-executable " --version")))))
(helm-log "helm-fd-process" "Fd command:\nfd %s"
(mapconcat 'identity cmd " "))
(helm-log "helm-fd-process" "VERSION: %s" fd-version)
(prog1
proc
(set-process-sentinel
proc (lambda (process event)
(if (or (string= event "finished\n")
(process-get process 'reach-limit))
(with-helm-window
(when helm-fd-mode-line-function
(funcall helm-fd-mode-line-function start-time fd-version)
(force-mode-line-update)))
(helm-log "helm-fd-process sentinel" "Error: Fd %s"
(replace-regexp-in-string "\n" "" event))))))))
(defun helm-fd-default-mode-line (start-time fd-version)
"Format mode-line with START-TIME and FD-VERSION, as well as `fd' results."
(setq mode-line-format
`(" " mode-line-buffer-identification " "
(:eval (format "L%s" (helm-candidate-number-at-point))) " "
(:eval (propertize
(format
"[%s process finished in %.2fs - (%s results)] "
,fd-version
,(- (float-time) start-time)
(helm-get-candidate-number))
'face 'helm-fd-finish)))))
(defun helm-fd-fct (candidates _source)
"The filtered-candidate-transformer function for helm-fd."
(cl-loop for i in candidates
for fname = (ansi-color-apply i)
if helm-ff-icon-mode collect
(let* ((abs (expand-file-name fname default-directory))
(icon (if (file-directory-p abs)
(helm-x-icons-generic "file-directory")
(helm-x-icons-icon-for-file (helm-basename fname)))))
(cons (concat icon fname) fname))
else collect fname))
(defun helm-fd-1 (directory)
"Run fd shell command on DIRECTORY with helm interface."
(cl-assert (executable-find helm-fd-executable) nil "Could not find fd executable")
(cl-assert (not (file-remote-p directory)) nil "Fd not supported on remote directories")
(let ((default-directory directory))
(helm :sources (helm-make-source "Fd" 'helm-fd-class
:header-name
(lambda (name)
(format "%s (%s)"
name (abbreviate-file-name default-directory))))
:buffer "*helm fd*")))
(provide 'helm-fd)
;;; helm-fd.el ends here
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