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diff --git a/.emacs.d/lisp/my/my-help.el b/.emacs.d/lisp/my/my-help.el
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@@ -1,138 +0,0 @@
-;;; my-help.el -- Help related extensions for emacs core -*- lexical-binding: t -*-
-
-;; Copyright (C) 2023 Free Software Foundation.
-
-;; Author: Yuchen Pei <id@ypei.org>
-;; Package-Requires: ((emacs "28.2"))
-
-;; This file is part of dotfiles.
-
-;; dotfiles is free software: you can redistribute it and/or modify it under
-;; the terms of the GNU Affero General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; dotfiles 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 Affero General
-;; Public License for more details.
-
-;; You should have received a copy of the GNU Affero General Public
-;; License along with dotfiles.  If not, see <https://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; Emacs help related extensions.
-
-;;; Code:
-
-
-;; find source of external command
-(defun my-external-command-open-source (command)
-  (interactive
-   (list (completing-read
-          "Open source of command: "
-          (my-external-command-collection))))
-  (let ((subject
-         (cadr
-          (split-string (my-shell-command-output
-                         (format "type %s" command))
-                        " is "))))
-    (pcase subject
-      ("a shell builtin" (error "%s is %s" command subject))
-      ("a shell keyword" (error "%s is %s" command subject))
-      ((guard (string-prefix-p "is aliased to " subject))
-       (substring subject (error "%s is %s" command subject)))
-      (_
-       (pcase-let
-           ((`(,path ,type)
-             (split-string 
-              (my-shell-command-output (format "file -Li %s" subject))
-              ": ")))
-         (if (string-prefix-p "text/" type)
-             (progn
-               (message "Opening %s" path)
-               (find-file path))
-           (error "%s (%s) is not plaintext: %s" command path type)))))))
-
-(defun my-external-command-collection ()
-  (mapcan
-   (lambda (dir)
-     (mapcar
-      (lambda (file)
-        (string-match "\\(?:.*\\)/\\(.*\\)" file)
-        (match-string 1 file))
-      (seq-filter
-       (lambda (file)
-         (and (not (file-directory-p file))
-              (file-executable-p file)))
-       (directory-files dir t "[^~#]$"))))
-   (seq-filter
-    'file-accessible-directory-p
-    (exec-path))))
-
-(defun my-woman-man (arg)
-  (interactive "P")
-  (if arg (call-interactively 'man)
-    (call-interactively 'woman)))
-
-(defun my-help-goto-symbol (symbol)
-  (interactive
-   ;; copied from prompt code of help-describe-symbol
-   (let* ((v-or-f (symbol-at-point))
-          (found (if v-or-f (cl-some (lambda (x) (funcall (nth 1 x) v-or-f))
-                                     describe-symbol-backends)))
-          (v-or-f (if found v-or-f (function-called-at-point)))
-          (found (or found v-or-f))
-          (enable-recursive-minibuffers t)
-          (val (completing-read (format-prompt "Describe symbol"
-                                               (and found v-or-f))
-				                        #'help--symbol-completion-table
-				                        (lambda (vv)
-                                  (cl-some (lambda (x) (funcall (nth 1 x) vv))
-                                           describe-symbol-backends))
-				                        t nil nil
-				                        (if found (symbol-name v-or-f)))))
-     (list (if (equal val "")
-	             (or v-or-f "") (intern val)))))
-  (help-do-xref nil #'describe-symbol (list symbol)))
-
-(defun my-describe-local-variable (variable &optional buffer frame)
-  (interactive
-   (let ((v (variable-at-point))
-	       (enable-recursive-minibuffers t)
-         (orig-buffer (current-buffer))
-	       val)
-     (setq val (completing-read
-                (format-prompt "Describe variable" (and (symbolp v) v))
-                #'help--symbol-completion-table
-                (lambda (vv)
-                  (and (local-variable-p vv)
-                       (or (get vv 'variable-documentation)
-                           (and (not (keywordp vv))
-                                ;; Since the variable may only exist in the
-                                ;; original buffer, we have to look for it
-                                ;; there.
-                                (buffer-local-boundp vv orig-buffer)))))
-                t nil nil
-                (if (symbolp v) (symbol-name v))))
-     (list (if (equal val "")
-	             v (intern val)))))
-  (describe-variable variable buffer frame))
-
-(defun my-info-display-manual ()
-  (interactive)
-  (call-interactively 'info-display-manual)
-  (when (derived-mode-p 'Info-mode)
-    (rename-buffer
-     (generate-new-buffer-name
-      (format "*info %s*"
-              (file-name-sans-extension
-		           (file-name-nondirectory Info-current-file)))))))
-
-(defun my-describe-symbol-at-point ()
-  (interactive)
-  (describe-symbol (symbol-at-point)))
-
-(provide 'my-help)
-;;; my-help.el ends here