7f1dae114d
The warning was introduced and detected by an optimizer addition proposed in the following thread: https://lists.gnu.org/archive/html/emacs-devel/2019-12/msg00711.html * lisp/org/ob-screen.el (org-babel-screen-test): Avoid 'value returned from (format "...") is unused' warning by doing something more useful than busy string manipulation while waiting for an asynchronous subprocess to make the temporary file readable.
143 lines
5.3 KiB
EmacsLisp
143 lines
5.3 KiB
EmacsLisp
;;; ob-screen.el --- Babel Support for Interactive Terminal -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2020 Free Software Foundation, Inc.
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;; Author: Benjamin Andresen
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;; Keywords: literate programming, interactive shell
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;; Homepage: https://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-screen-test RET
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;;; Code:
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(require 'ob)
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(defvar org-babel-screen-location "screen"
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"The command location for screen.
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In case you want to use a different screen than one selected by your $PATH")
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(defvar org-babel-default-header-args:screen
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'((:results . "silent") (:session . "default") (:cmd . "sh") (:terminal . "xterm"))
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"Default arguments to use when running screen source blocks.")
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(defun org-babel-execute:screen (body params)
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"Send a block of code via screen 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-screen-session-socketname session)))
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(unless socket (org-babel-prep-session:screen session params))
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(org-babel-screen-session-execute-string
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session (org-babel-expand-body:generic body params)))))
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(defun org-babel-prep-session:screen (_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 `("-T" ,(concat "org-babel: " session) "-e" ,org-babel-screen-location
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"-c" "/dev/null" "-mS" ,(concat "org-babel-session-" session)
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,cmd))
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;; XXX: Is there a better way than the following?
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(while (not (org-babel-screen-session-socketname session))
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;; wait until screen session is available before returning
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)))
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;; helper functions
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(defun org-babel-screen-session-execute-string (session body)
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"If SESSION exists, send BODY to it."
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(let ((socket (org-babel-screen-session-socketname session)))
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(when socket
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(let ((tmpfile (org-babel-screen-session-write-temp-file session body)))
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(apply 'start-process (concat "org-babel: screen (" session ")") "*Messages*"
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org-babel-screen-location
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`("-S" ,socket "-X" "eval" "msgwait 0"
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,(concat "readreg z " tmpfile)
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"paste z"))))))
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(defun org-babel-screen-session-socketname (session)
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"Check if SESSION exists by parsing output of \"screen -ls\"."
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(let* ((screen-ls (shell-command-to-string "screen -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 (or "(Attached)" "(Detached)")) x)
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x))
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(split-string screen-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-screen-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 "screen-")))
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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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(sit-for 0.1))
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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-screen)
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;;; ob-screen.el ends here
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