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;;; em-term.el --- running visual commands
;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
;; 2008, 2009 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; At the moment, eshell is stream-based in its interactive input and
;; output. This means that full-screen commands, such as "vi" or
;; "lynx", will not display correctly. These are therefore thought of
;; as "visual" programs. In order to run these progrem under Emacs,
;; Eshell uses the term.el package, and invokes them in a separate
;; buffer, giving the illusion that Eshell itself is allowing these
;; visual processes to execute.
;;; Code:
(eval-when-compile (require 'eshell))
(require 'term)
;;;###autoload
(eshell-defgroup eshell-term nil
"This module causes visual commands (e.g., 'vi') to be executed by
the `term' package, which comes with Emacs. This package handles most
of the ANSI control codes, allowing curses-based applications to run
within an Emacs window. The variable `eshell-visual-commands' defines
which commands are considered visual in nature."
:tag "Running visual commands"
:group 'eshell-module)
;;; User Variables:
(defcustom eshell-term-load-hook '(eshell-term-initialize)
"*A list of functions to call when loading `eshell-term'."
:type 'hook
:group 'eshell-term)
(defcustom eshell-visual-commands
'("vi" ; what is going on??
"screen" "top" ; ok, a valid program...
"less" "more" ; M-x view-file
"lynx" "ncftp" ; w3.el, ange-ftp
"pine" "tin" "trn" "elm") ; GNUS!!
"*A list of commands that present their output in a visual fashion."
:type '(repeat string)
:group 'eshell-term)
(defcustom eshell-term-name "eterm"
"*Name to use for the TERM variable when running visual commands.
See `term-term-name' in term.el for more information on how this is
used."
:type 'string
:group 'eshell-term)
(defcustom eshell-escape-control-x t
"*If non-nil, allow <C-x> to be handled by Emacs key in visual buffers.
See the variable `eshell-visual-commands'. If this variable is set to
nil, <C-x> will send that control character to the invoked process."
:type 'boolean
:group 'eshell-term)
;;; Internal Variables:
(defvar eshell-parent-buffer)
;;; Functions:
(defun eshell-term-initialize ()
"Initialize the `term' interface code."
(make-local-variable 'eshell-interpreter-alist)
(setq eshell-interpreter-alist
(cons (cons (function
(lambda (command)
(member (file-name-nondirectory command)
eshell-visual-commands)))
'eshell-exec-visual)
eshell-interpreter-alist)))
(defun eshell-exec-visual (&rest args)
"Run the specified PROGRAM in a terminal emulation buffer.
ARGS are passed to the program. At the moment, no piping of input is
allowed."
(let* (eshell-interpreter-alist
(interp (eshell-find-interpreter (car args)))
(program (car interp))
(args (eshell-flatten-list
(eshell-stringify-list (append (cdr interp)
(cdr args)))))
(term-buf
(generate-new-buffer
(concat "*" (file-name-nondirectory program) "*")))
(eshell-buf (current-buffer)))
(save-current-buffer
(switch-to-buffer term-buf)
(term-mode)
(set (make-local-variable 'term-term-name) eshell-term-name)
(make-local-variable 'eshell-parent-buffer)
(setq eshell-parent-buffer eshell-buf)
(term-exec term-buf program program nil args)
(let ((proc (get-buffer-process term-buf)))
(if (and proc (eq 'run (process-status proc)))
(set-process-sentinel proc 'eshell-term-sentinel)
(error "Failed to invoke visual command")))
(term-char-mode)
(if eshell-escape-control-x
(term-set-escape-char ?\C-x))))
nil)
(defun eshell-term-sentinel (proc string)
"Destroy the buffer visiting PROC."
(let ((proc-buf (process-buffer proc)))
(when (and proc-buf (buffer-live-p proc-buf)
(not (eq 'run (process-status proc)))
(= (process-exit-status proc) 0))
(if (eq (current-buffer) proc-buf)
(let ((buf (and (boundp 'eshell-parent-buffer)
eshell-parent-buffer
(buffer-live-p eshell-parent-buffer)
eshell-parent-buffer)))
(if buf
(switch-to-buffer buf))))
(kill-buffer proc-buf))))
;; jww (1999-09-17): The code below will allow Eshell to send input
;; characters directly to the currently running interactive process.
;; However, since this would introduce other problems that would need
;; solutions, I'm going to let it wait until after 2.1.
; (defvar eshell-term-raw-map nil
; "Keyboard map for sending characters directly to the inferior process.")
; (defvar eshell-term-escape-char nil
; "Escape character for char-sub-mode of term mode.
; Do not change it directly; use term-set-escape-char instead.")
; (defvar eshell-term-raw-escape-map nil)
; (defun eshell-term-send-raw-string (chars)
; (goto-char eshell-last-output-end)
; (process-send-string (eshell-interactive-process) chars))
; (defun eshell-term-send-raw ()
; "Send the last character typed through the terminal-emulator
; without any interpretation."
; (interactive)
; ;; Convert `return' to C-m, etc.
; (if (and (symbolp last-input-event)
; (get last-input-event 'ascii-character))
; (setq last-input-event (get last-input-event 'ascii-character)))
; (eshell-term-send-raw-string (make-string 1 last-input-event)))
; (defun eshell-term-send-raw-meta ()
; (interactive)
; (if (symbolp last-input-event)
; ;; Convert `return' to C-m, etc.
; (let ((tmp (get last-input-event 'event-symbol-elements)))
; (if tmp
; (setq last-input-event (car tmp)))
; (if (symbolp last-input-event)
; (progn
; (setq tmp (get last-input-event 'ascii-character))
; (if tmp (setq last-input-event tmp))))))
; (eshell-term-send-raw-string (if (and (numberp last-input-event)
; (> last-input-event 127)
; (< last-input-event 256))
; (make-string 1 last-input-event)
; (format "\e%c" last-input-event))))
; (defun eshell-term-mouse-paste (click arg)
; "Insert the last stretch of killed text at the position clicked on."
; (interactive "e\nP")
; (if (boundp 'xemacs-logo)
; (eshell-term-send-raw-string
; (or (condition-case () (x-get-selection) (error ()))
; (x-get-cutbuffer)
; (error "No selection or cut buffer available")))
; ;; Give temporary modes such as isearch a chance to turn off.
; (run-hooks 'mouse-leave-buffer-hook)
; (setq this-command 'yank)
; (eshell-term-send-raw-string
; (current-kill (cond ((listp arg) 0)
; ((eq arg '-) -1)
; (t (1- arg)))))))
; ;; Which would be better: "\e[A" or "\eOA"? readline accepts either.
; ;; For my configuration it's definitely better \eOA but YMMV. -mm
; ;; For example: vi works with \eOA while elm wants \e[A ...
; (defun eshell-term-send-up () (interactive) (eshell-term-send-raw-string "\eOA"))
; (defun eshell-term-send-down () (interactive) (eshell-term-send-raw-string "\eOB"))
; (defun eshell-term-send-right () (interactive) (eshell-term-send-raw-string "\eOC"))
; (defun eshell-term-send-left () (interactive) (eshell-term-send-raw-string "\eOD"))
; (defun eshell-term-send-home () (interactive) (eshell-term-send-raw-string "\e[1~"))
; (defun eshell-term-send-end () (interactive) (eshell-term-send-raw-string "\e[4~"))
; (defun eshell-term-send-prior () (interactive) (eshell-term-send-raw-string "\e[5~"))
; (defun eshell-term-send-next () (interactive) (eshell-term-send-raw-string "\e[6~"))
; (defun eshell-term-send-del () (interactive) (eshell-term-send-raw-string "\C-?"))
; (defun eshell-term-send-backspace () (interactive) (eshell-term-send-raw-string "\C-H"))
; (defun eshell-term-set-escape-char (c)
; "Change term-escape-char and keymaps that depend on it."
; (if eshell-term-escape-char
; (define-key eshell-term-raw-map eshell-term-escape-char 'eshell-term-send-raw))
; (setq c (make-string 1 c))
; (define-key eshell-term-raw-map c eshell-term-raw-escape-map)
; ;; Define standard bindings in eshell-term-raw-escape-map
; (define-key eshell-term-raw-escape-map "\C-x"
; (lookup-key (current-global-map) "\C-x"))
; (define-key eshell-term-raw-escape-map "\C-v"
; (lookup-key (current-global-map) "\C-v"))
; (define-key eshell-term-raw-escape-map "\C-u"
; (lookup-key (current-global-map) "\C-u"))
; (define-key eshell-term-raw-escape-map c 'eshell-term-send-raw))
; (defun eshell-term-char-mode ()
; "Switch to char (\"raw\") sub-mode of term mode.
; Each character you type is sent directly to the inferior without
; intervention from Emacs, except for the escape character (usually C-c)."
; (interactive)
; (if (not eshell-term-raw-map)
; (let* ((map (make-keymap))
; (esc-map (make-keymap))
; (i 0))
; (while (< i 128)
; (define-key map (make-string 1 i) 'eshell-term-send-raw)
; (define-key esc-map (make-string 1 i) 'eshell-term-send-raw-meta)
; (setq i (1+ i)))
; (define-key map "\e" esc-map)
; (setq eshell-term-raw-map map)
; (setq eshell-term-raw-escape-map
; (copy-keymap (lookup-key (current-global-map) "\C-x")))
; (if (boundp 'xemacs-logo)
; (define-key eshell-term-raw-map [button2] 'eshell-term-mouse-paste)
; (define-key eshell-term-raw-map [mouse-2] 'eshell-term-mouse-paste))
; (define-key eshell-term-raw-map [up] 'eshell-term-send-up)
; (define-key eshell-term-raw-map [down] 'eshell-term-send-down)
; (define-key eshell-term-raw-map [right] 'eshell-term-send-right)
; (define-key eshell-term-raw-map [left] 'eshell-term-send-left)
; (define-key eshell-term-raw-map [delete] 'eshell-term-send-del)
; (define-key eshell-term-raw-map [backspace] 'eshell-term-send-backspace)
; (define-key eshell-term-raw-map [home] 'eshell-term-send-home)
; (define-key eshell-term-raw-map [end] 'eshell-term-send-end)
; (define-key eshell-term-raw-map [prior] 'eshell-term-send-prior)
; (define-key eshell-term-raw-map [next] 'eshell-term-send-next)
; (eshell-term-set-escape-char ?\C-c))))
; (defun eshell-term-line-mode ()
; "Switch to line (\"cooked\") sub-mode of eshell-term mode."
; (use-local-map term-old-mode-map))
(provide 'em-term)
;; Local Variables:
;; generated-autoload-file: "esh-groups.el"
;; End:
;; arch-tag: ab7c8fe4-3101-4257-925b-1354c6b2fe9d
;;; em-term.el ends here
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