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;;; ob-tmux.el --- Babel Support for Interactive Terminal -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2017 Free Software Foundation, Inc.
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;; Author: Benjamin Andresen, Allard Hendriksen
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;; Keywords: literate programming, interactive shell
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;; Homepage: http://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Org-Babel support for interactive terminals. Mostly shell scripts.
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;; Heavily inspired by 'eev' from Eduardo Ochs
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;;
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;; Adding :cmd and :terminal as header arguments
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;; :terminal must support the -T (title) and -e (command) parameter
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;;
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;; You can test the default setup. (xterm + sh) with
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;; M-x org-babel-tmux-test RET
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;;; Code:
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(require 'ob)
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(defvar org-babel-tmux-location "tmux"
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"The command location for tmux.
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In case you want to use a different tmux than one selected by your $PATH")
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(defvar org-babel-default-header-args:tmux
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'((:results . "silent") (:session . "default") (:cmd . "bash") (:terminal . "gnome-terminal"))
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"Default arguments to use when running tmux source blocks.")
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(defun org-babel-execute:tmux (body params)
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"Send a block of code via tmux to a terminal using Babel.
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\"default\" session is used when none is specified."
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(message "Sending source code block to interactive terminal session...")
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(save-window-excursion
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(let* ((session (cdr (assq :session params)))
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(socket (org-babel-tmux-session-socketname session)))
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(unless socket (org-babel-prep-session:tmux session params))
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(org-babel-tmux-session-execute-string
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session (org-babel-expand-body:generic body params)))))
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(defun org-babel-prep-session:tmux (_session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(let* ((session (cdr (assq :session params)))
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(cmd (cdr (assq :cmd params)))
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(terminal (cdr (assq :terminal params)))
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(process-name (concat "org-babel: terminal (" session ")")))
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(apply 'start-process process-name "*Messages*"
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terminal
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`("--"
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,org-babel-tmux-location
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"new-session" "-A" "-s"
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,(concat "org-babel-session-" session)))
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;; XXX: Is there a better way than the following?
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(while (not (org-babel-tmux-session-socketname session))
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;; wait until tmux session is available before returning
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)))
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;; helper functions
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(defun org-babel-tmux-session-execute-string (session body)
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"If SESSION exists, send BODY to it."
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(let ((socket (org-babel-tmux-session-socketname session)))
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(when socket
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(let ((tmpfile (org-babel-tmux-session-write-temp-file session body)))
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(shell-command
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(concat "cat " tmpfile
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" | xargs -I{} tmux send-keys -t org-babel-session-" session ":1 '{}' Enter"))))))
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(defun org-babel-tmux-session-socketname (session)
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"Check if SESSION exists by parsing output of \"tmux ls\"."
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(let* ((tmux-ls (shell-command-to-string "tmux ls"))
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(sockets (delq
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nil
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(mapcar
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(lambda (x)
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(when (string-match (rx "windows") x)
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x))
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(split-string tmux-ls "\n"))))
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(match-socket (car
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(delq
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nil
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(mapcar
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(lambda (x)
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(when (string-match
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(concat "org-babel-session-" session) x)
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x))
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sockets)))))
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(when match-socket (car (split-string match-socket ":")))))
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(defun org-babel-tmux-session-write-temp-file (_session body)
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"Save BODY in a temp file that is named after SESSION."
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(let ((tmpfile (org-babel-temp-file "ob-tmux-")))
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(with-temp-file tmpfile
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(insert body)
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;; org-babel has superfluous spaces
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(goto-char (point-min))
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(delete-matching-lines "^ +$"))
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tmpfile))
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;; (defun org-babel-screen-test ()
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;; "Test if the default setup works.
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;; The terminal should shortly flicker."
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;; (interactive)
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;; (let* ((random-string (format "%s" (random 99999)))
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;; (tmpfile (org-babel-temp-file "ob-screen-test-"))
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;; (body (concat "echo '" random-string "' > " tmpfile "\nexit\n"))
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;; tmp-string)
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;; (org-babel-execute:screen body org-babel-default-header-args:screen)
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;; ;; XXX: need to find a better way to do the following
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;; (while (not (file-readable-p tmpfile))
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;; ;; do something, otherwise this will be optimized away
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;; (format "org-babel-screen: File not readable yet."))
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;; (setq tmp-string (with-temp-buffer
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;; (insert-file-contents-literally tmpfile)
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;; (buffer-substring (point-min) (point-max))))
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;; (delete-file tmpfile)
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;; (message (concat "org-babel-screen: Setup "
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;; (if (string-match random-string tmp-string)
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;; "WORKS."
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;; "DOESN'T work.")))))
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(provide 'ob-tmux)
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;;; ob-tmux.el ends here
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