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;;; term-switcher.el --- Easily switch between open X11 terminals
;;
;; Copyright (C) 2019 Google Inc.
;;
;; Author: Vincent Ambo <tazjin@google.com>
;; Version: 1.0
;; Package-Requires: (dash ivy s)
;;
;;; Commentary:
;;
;; This package adds a function that lets users quickly switch between
;; different open X11 terminals using ivy.
;;
;; It is primarily intended to be used by EXWM users who use graphical
;; terminals inside of Emacs.
;;
;; Users MUST configure the group `term-switcher' and can then bind
;; `ts/switch-to-terminal' to an appropriate key.
(require 'dash)
(require 'ivy)
(require 's)
(defgroup term-switcher nil
"Customization options for configuring `term-switcher' with the
user's terminal emulator of choice.")
(defcustom term-switcher-program "gnome-terminal"
"X11 terminal application to use."
:type '(string)
:group 'term-switcher)
(defcustom term-switcher-buffer-prefix "Term"
"String prefix for X11 terminal buffers. For example, if your
EXWM configuration renames X11 terminal buffers to
`Term</foo/bar>' you might want to use `Term' as the matching
prefix."
:type '(string)
:group 'term-switcher)
(defun ts/run-terminal-program ()
(message "Starting %s..." term-switcher-program)
(start-process-shell-command term-switcher-program nil term-switcher-program))
(defun ts/open-or-create-terminal-buffer (buffer-name)
"Switch to the buffer with BUFFER-NAME or create a new buffer
running the configured X11 terminal."
(let ((buffer (get-buffer buffer-name)))
(if (not buffer)
(ts/run-terminal-program)
(switch-to-buffer buffer))))
(defun ts/is-terminal-buffer (buffer)
"Determine whether BUFFER runs an X11 terminal."
(and (equal 'exwm-mode (buffer-local-value 'major-mode buffer))
(s-starts-with? term-switcher-buffer-prefix (buffer-name buffer))))
(defun ts/switch-to-terminal ()
"Switch to an X11 terminal buffer, or create a new one."
(interactive)
(let ((terms (-map #'buffer-name
(-filter #'ts/is-terminal-buffer (buffer-list)))))
(if terms
(ivy-read "Switch to terminal buffer: "
(cons "New terminal" terms)
:caller 'ts/switch-to-terminal
:preselect (s-concat "^" term-switcher-buffer-prefix)
:require-match t
:action #'ts/open-or-create-terminal-buffer)
(ts/run-terminal-program))))
(provide 'term-switcher)
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