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Run 'top' command on a remote side using Guile-SSH remote pipes, show the output of 'top' in uppercase letters.
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#!/usr/bin/guile \ | |
-e main -s | |
!# | |
;;; uptop.scm -- Uppercase top. | |
;; Copyright (C) 2016 Artyom V. Poptsov <poptsov.artyom@gmail.com> | |
;; | |
;; This program 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. | |
;; | |
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>. | |
;;; Commentary: | |
;; The program is known to work on the Guile-SSH 'master' branch, commit | |
;; 2ab0287. | |
;;; Code: | |
(use-modules (srfi srfi-41) ; streams | |
(ssh session) | |
(ssh auth) | |
(ssh popen) ; remote pipes | |
(ssh channel)) ; channel-set-pty! | |
(define (pipe->stream p) | |
"Convert a pipe P to a SRFI-41 stream." | |
(stream-let loop ((c (read-char p))) | |
(if (eof-object? c) | |
(begin | |
(close-input-port p) | |
stream-null) | |
(stream-cons c (loop (read-char p)))))) | |
(define (open-remote-input-pipe/pty* session command . args) | |
"Open remote input pipe with PTY, run a COMMAND with ARGS." | |
(define OPEN_PTY_READ (string-append OPEN_PTY OPEN_READ)) | |
(let ((p (apply open-remote-pipe* session OPEN_PTY_READ command args))) | |
(channel-set-pty-size! p 80 40) | |
p)) | |
(define char-upcase/skip-esc | |
(let ((state 'regular-char)) | |
(lambda (chr) | |
"Return the uppercase character version of a CHR, skip therminal escape | |
sequences." | |
(cond | |
((char=? chr (integer->char 27)) | |
(set! state 'escape-sequence) | |
chr) | |
((char=? chr #\m) | |
(if (equal? state 'escape-sequence) | |
(begin | |
(set! state 'regular-char) | |
chr) | |
(char-upcase chr))) | |
(else | |
(char-upcase chr)))))) | |
;;; | |
(define (main args) | |
"Entry point." | |
(let ((s (make-session #:host "example.org"))) | |
(connect! s) | |
(userauth-agent! s) | |
(let ((rs (pipe->stream (open-remote-input-pipe/pty* s "top" "-u $USER")))) | |
(stream-for-each display (stream-map char-upcase/skip-esc rs))))) | |
;;; uptop.scm ends here. |
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