spacemacs/layers/+tools/xclipboard/local/spacemacs-xclipboard/spacemacs-xclipboard.el

;;; spacemacs-xclipboard.el --- Add support for xclipboard in the terminal
;;
;; Copyright (c) 2012-2021 Sylvain Benner & Contributors
;;
;; Authors: Charles Weill <weill@google.com>
;;          Google LLC.
;;; Commentary:
;; URL: https://github.com/syl20bnr/spacemacs
;;
;; This file is not part of GNU Emacs.
;;
;;; License: GPLv3
;;
;;; Code:

(defun spacemacs/xclipboard-get-display ()
  (shell-command-to-string "if [[ -n $TMUX ]]; then
      export DISPLAY=$(tmux show-environment | grep -o '^DISPLAY.*$' | sed 's/DISPLAY=//')
    fi
    if [[ -z $DISPLAY ]]; then
      export DISPLAY=:0
    fi
    printf $DISPLAY"))

(defun spacemacs//xclipboard-get-copy-command ()
  (if xclipboard-copy-command
      xclipboard-copy-command
    (shell-command-to-string "command_exists() {
        local command=\"$1\"
        type \"$command\" >/dev/null 2>&1
      }

      # Installing reattach-to-user-namespace is recommended on macOS.
      if command_exists \"pbcopy\"; then
          if command_exists \"reattach-to-user-namespace\"; then
              printf \"reattach-to-user-namespace pbcopy\"
          else
              printf \"pbcopy\"
          fi
      elif command_exists \"clip.exe\"; then # WSL clipboard command
          printf \"clip.exe\"
      elif command_exists \"xsel\"; then
          printf \"xsel -ib\"
      elif command_exists \"putclip\"; then # cygwin clipboard command
          printf \"putclip\"
      fi")))

(defun spacemacs//xclipboard-get-paste-command ()
  (if xclipboard-paste-command
      xclipboard-paste-command
    (shell-command-to-string "command_exists() {
        local command=\"$1\"
        type \"$command\" >/dev/null 2>&1
      }

      # Installing reattach-to-user-namespace is recommended on macOS.
      if command_exists \"pbpaste\"; then
          if command_exists \"reattach-to-user-namespace\"; then
              printf \"reattach-to-user-namespace pbpaste\"
          else
              printf \"pbpaste\"
          fi
      elif command_exists \"paste.exe\"; then # WSL clipboard command
          printf \"paste.exe\"
      elif command_exists \"xsel\"; then
          printf \"xsel -ob\"
      elif command_exists \"getclip\"; then # cygwin clipboard command
          printf \"getclip\"
      fi")))

(defun spacemacs/xclipboard-copy ()
  "Copies selection to x-clipboard."
  (interactive)
  (if (display-graphic-p)
    (progn
      (message "Copied region to x-clipboard!")
      (call-interactively 'clipboard-kill-ring-save))
    (if (region-active-p)
      (progn
        (shell-command-on-region
         (region-beginning) (region-end)
         (format "DISPLAY=%s %s"
                 (spacemacs/xclipboard-get-display)
                 (spacemacs//xclipboard-get-copy-command)))
        (message (format "Copied region to clipboard \"%s\"!"
                         (spacemacs/xclipboard-get-display)))
        (deactivate-mark))
      (message "No region active; can't copy to clipboard!"))))

(defun spacemacs/xclipboard-paste ()
  "Pastes from x-clipboard."
  (interactive)
  (if (display-graphic-p)
    (progn
      (clipboard-yank)
      (message "graphics active"))
    (insert (shell-command-to-string
             (format "DISPLAY=%s %s"
                     (spacemacs/xclipboard-get-display)
                     (spacemacs//xclipboard-get-paste-command)))))
  (message (format "Pasted from clipboard \"%s\"!"
                   (spacemacs/xclipboard-get-display))))

(provide 'spacemacs-xclipboard)