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bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
546 lines
20 KiB
EmacsLisp
546 lines
20 KiB
EmacsLisp
;;; esh-proc.el --- process management -*- lexical-binding:t -*-
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;; Copyright (C) 1999-2017 Free Software Foundation, Inc.
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;; Author: John Wiegley <johnw@gnu.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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;;; Code:
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(provide 'esh-proc)
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(require 'esh-cmd)
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(defgroup eshell-proc nil
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"When Eshell invokes external commands, it always does so
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asynchronously, so that Emacs isn't tied up waiting for the process to
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finish."
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:tag "Process management"
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:group 'eshell)
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;;; User Variables:
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(defcustom eshell-proc-load-hook nil
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"A hook that gets run when `eshell-proc' is loaded."
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:version "24.1" ; removed eshell-proc-initialize
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:type 'hook
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:group 'eshell-proc)
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(defcustom eshell-process-wait-seconds 0
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"The number of seconds to delay waiting for a synchronous process."
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:type 'integer
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:group 'eshell-proc)
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(defcustom eshell-process-wait-milliseconds 50
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"The number of milliseconds to delay waiting for a synchronous process."
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:type 'integer
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:group 'eshell-proc)
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(defcustom eshell-done-messages-in-minibuffer t
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"If non-nil, subjob \"Done\" messages will display in minibuffer."
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:type 'boolean
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:group 'eshell-proc)
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(defcustom eshell-delete-exited-processes t
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"If nil, process entries will stick around until `jobs' is run.
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This variable sets the buffer-local value of `delete-exited-processes'
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in Eshell buffers.
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This variable causes Eshell to mimic the behavior of bash when set to
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nil. It allows the user to view the exit status of a completed subjob
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\(process) at their leisure, because the process entry remains in
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memory until the user examines it using \\[list-processes].
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Otherwise, if `eshell-done-messages-in-minibuffer' is nil, and this
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variable is set to t, the only indication the user will have that a
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subjob is done is that it will no longer appear in the
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\\[list-processes\\] display.
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Note that Eshell will have to be restarted for a change in this
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variable's value to take effect."
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:type 'boolean
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:group 'eshell-proc)
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(defcustom eshell-reset-signals
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"^\\(interrupt\\|killed\\|quit\\|stopped\\)"
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"If a termination signal matches this regexp, the terminal will be reset."
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:type 'regexp
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:group 'eshell-proc)
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(defcustom eshell-exec-hook nil
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"Called each time a process is exec'd by `eshell-gather-process-output'.
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It is passed one argument, which is the process that was just started.
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It is useful for things that must be done each time a process is
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executed in a eshell mode buffer (e.g., `process-kill-without-query').
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In contrast, `eshell-mode-hook' is only executed once when the buffer
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is created."
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:type 'hook
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:group 'eshell-proc)
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(defcustom eshell-kill-hook nil
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"Called when a process run by `eshell-gather-process-output' has ended.
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It is passed two arguments: the process that was just ended, and the
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termination status (as a string). Note that the first argument may be
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nil, in which case the user attempted to send a signal, but there was
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no relevant process. This can be used for displaying help
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information, for example."
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:version "24.1" ; removed eshell-reset-after-proc
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:type 'hook
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:group 'eshell-proc)
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;;; Internal Variables:
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(defvar eshell-current-subjob-p nil)
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(defvar eshell-process-list nil
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"A list of the current status of subprocesses.")
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;;; Functions:
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(defun eshell-kill-process-function (proc status)
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"Function run when killing a process.
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Runs `eshell-reset-after-proc' and `eshell-kill-hook', passing arguments
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PROC and STATUS to functions on the latter."
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;; Was there till 24.1, but it is not optional.
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(if (memq 'eshell-reset-after-proc eshell-kill-hook)
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(setq eshell-kill-hook (delq 'eshell-reset-after-proc eshell-kill-hook)))
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(eshell-reset-after-proc status)
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(run-hook-with-args 'eshell-kill-hook proc status))
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(defun eshell-proc-initialize ()
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"Initialize the process handling code."
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(make-local-variable 'eshell-process-list)
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(define-key eshell-command-map [(meta ?i)] 'eshell-insert-process)
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(define-key eshell-command-map [(control ?c)] 'eshell-interrupt-process)
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(define-key eshell-command-map [(control ?k)] 'eshell-kill-process)
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(define-key eshell-command-map [(control ?d)] 'eshell-send-eof-to-process)
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; (define-key eshell-command-map [(control ?q)] 'eshell-continue-process)
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(define-key eshell-command-map [(control ?s)] 'list-processes)
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; (define-key eshell-command-map [(control ?z)] 'eshell-stop-process)
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(define-key eshell-command-map [(control ?\\)] 'eshell-quit-process))
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(defun eshell-reset-after-proc (status)
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"Reset the command input location after a process terminates.
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The signals which will cause this to happen are matched by
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`eshell-reset-signals'."
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(if (and (stringp status)
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(string-match eshell-reset-signals status))
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(eshell-reset)))
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(defun eshell-wait-for-process (&rest procs)
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"Wait until PROC has successfully completed."
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(while procs
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(let ((proc (car procs)))
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(when (eshell-processp proc)
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;; NYI: If the process gets stopped here, that's bad.
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(while (assq proc eshell-process-list)
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(if (input-pending-p)
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(discard-input))
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(sit-for eshell-process-wait-seconds
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eshell-process-wait-milliseconds))))
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(setq procs (cdr procs))))
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(defalias 'eshell/wait 'eshell-wait-for-process)
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(defun eshell/jobs (&rest args)
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"List processes, if there are any."
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(and (fboundp 'process-list)
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(process-list)
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(list-processes)))
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(defun eshell/kill (&rest args)
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"Kill processes.
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Usage: kill [-<signal>] <pid>|<process> ...
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Accepts PIDs and process objects."
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;; If the first argument starts with a dash, treat it as the signal
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;; specifier.
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(let ((signum 'SIGINT))
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(let ((arg (car args))
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(case-fold-search nil))
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(when (stringp arg)
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(cond
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((string-match "\\`-[[:digit:]]+\\'" arg)
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(setq signum (abs (string-to-number arg))))
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((string-match "\\`-\\([[:upper:]]+\\|[[:lower:]]+\\)\\'" arg)
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(setq signum (abs (string-to-number arg)))))
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(setq args (cdr args))))
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(while args
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(let ((arg (if (eshell-processp (car args))
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(process-id (car args))
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(car args))))
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(when arg
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(cond
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((null arg)
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(error "kill: null pid. Process may actually be a network connection."))
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((not (numberp arg))
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(error "kill: invalid argument type: %s" (type-of arg)))
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((and (numberp arg)
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(<= arg 0))
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(error "kill: bad pid: %d" arg))
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(t
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(signal-process arg signum)))))
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(setq args (cdr args))))
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nil)
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(defun eshell-read-process-name (prompt)
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"Read the name of a process from the minibuffer, using completion.
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The prompt will be set to PROMPT."
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(completing-read prompt
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(mapcar
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(function
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(lambda (proc)
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(cons (process-name proc) t)))
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(process-list)) nil t))
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(defun eshell-insert-process (process)
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"Insert the name of PROCESS into the current buffer at point."
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(interactive
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(list (get-process
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(eshell-read-process-name "Name of process: "))))
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(insert-and-inherit "#<process " (process-name process) ">"))
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(defsubst eshell-record-process-object (object)
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"Record OBJECT as now running."
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(if (and (eshell-processp object)
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eshell-current-subjob-p)
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(eshell-interactive-print
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(format "[%s] %d\n" (process-name object) (process-id object))))
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(setq eshell-process-list
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(cons (list object eshell-current-handles
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eshell-current-subjob-p nil nil)
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eshell-process-list)))
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(defun eshell-remove-process-entry (entry)
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"Record the process ENTRY as fully completed."
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(if (and (eshell-processp (car entry))
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(nth 2 entry)
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eshell-done-messages-in-minibuffer)
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(message "[%s]+ Done %s" (process-name (car entry))
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(process-command (car entry))))
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(setq eshell-process-list
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(delq entry eshell-process-list)))
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(defvar eshell-scratch-buffer " *eshell-scratch*"
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"Scratch buffer for holding Eshell's input/output.")
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(defvar eshell-last-sync-output-start nil
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"A marker that tracks the beginning of output of the last subprocess.
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Used only on systems which do not support async subprocesses.")
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(defvar eshell-needs-pipe '("bc")
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"List of commands which need `process-connection-type' to be nil.
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Currently only affects commands in pipelines, and not those at
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the front. If an element contains a directory part it must match
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the full name of a command, otherwise just the nondirectory part must match.")
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(defun eshell-needs-pipe-p (command)
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"Return non-nil if COMMAND needs `process-connection-type' to be nil.
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See `eshell-needs-pipe'."
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(and eshell-in-pipeline-p
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(not (eq eshell-in-pipeline-p 'first))
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;; FIXME should this return non-nil for anything that is
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;; neither 'first nor 'last? See bug#1388 discussion.
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(catch 'found
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(dolist (exe eshell-needs-pipe)
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(if (string-equal exe (if (string-match "/" exe)
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command
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(file-name-nondirectory command)))
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(throw 'found t))))))
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(defun eshell-gather-process-output (command args)
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"Gather the output from COMMAND + ARGS."
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(unless (and (file-executable-p command)
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(file-regular-p (file-truename command)))
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(error "%s: not an executable file" command))
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(let* ((delete-exited-processes
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(if eshell-current-subjob-p
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eshell-delete-exited-processes
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delete-exited-processes))
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(process-environment (eshell-environment-variables))
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proc decoding encoding changed)
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(cond
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((fboundp 'start-file-process)
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(setq proc
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(let ((process-connection-type
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(unless (eshell-needs-pipe-p command)
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process-connection-type))
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(command (file-local-name command)))
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(apply 'start-file-process
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(file-name-nondirectory command) nil
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;; `start-process' can't deal with relative filenames.
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(append (list (expand-file-name command)) args))))
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(eshell-record-process-object proc)
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(set-process-buffer proc (current-buffer))
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(if (eshell-interactive-output-p)
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(set-process-filter proc 'eshell-output-filter)
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(set-process-filter proc 'eshell-insertion-filter))
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(set-process-sentinel proc 'eshell-sentinel)
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(run-hook-with-args 'eshell-exec-hook proc)
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(when (fboundp 'process-coding-system)
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(let ((coding-systems (process-coding-system proc)))
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(setq decoding (car coding-systems)
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encoding (cdr coding-systems)))
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;; If start-process decided to use some coding system for
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;; decoding data sent from the process and the coding system
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;; doesn't specify EOL conversion, we had better convert CRLF
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;; to LF.
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(if (vectorp (coding-system-eol-type decoding))
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(setq decoding (coding-system-change-eol-conversion decoding 'dos)
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changed t))
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;; Even if start-process left the coding system for encoding
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;; data sent from the process undecided, we had better use the
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;; same one as what we use for decoding. But, we should
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;; suppress EOL conversion.
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(if (and decoding (not encoding))
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(setq encoding (coding-system-change-eol-conversion decoding 'unix)
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changed t))
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(if changed
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(set-process-coding-system proc decoding encoding))))
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(t
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;; No async subprocesses...
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(let ((oldbuf (current-buffer))
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(interact-p (eshell-interactive-output-p))
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lbeg lend line proc-buf exit-status)
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(and (not (markerp eshell-last-sync-output-start))
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(setq eshell-last-sync-output-start (point-marker)))
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(setq proc-buf
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(set-buffer (get-buffer-create eshell-scratch-buffer)))
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(erase-buffer)
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(set-buffer oldbuf)
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(run-hook-with-args 'eshell-exec-hook command)
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(setq exit-status
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(apply 'call-process-region
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(append (list eshell-last-sync-output-start (point)
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command t
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eshell-scratch-buffer nil)
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args)))
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;; When in a pipeline, record the place where the output of
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;; this process will begin.
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(and eshell-in-pipeline-p
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(set-marker eshell-last-sync-output-start (point)))
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;; Simulate the effect of the process filter.
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(when (numberp exit-status)
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(set-buffer proc-buf)
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(goto-char (point-min))
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(setq lbeg (point))
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(while (eq 0 (forward-line 1))
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(setq lend (point)
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line (buffer-substring-no-properties lbeg lend))
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(set-buffer oldbuf)
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(if interact-p
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(eshell-output-filter nil line)
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(eshell-output-object line))
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(setq lbeg lend)
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(set-buffer proc-buf))
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(set-buffer oldbuf))
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(eshell-update-markers eshell-last-output-end)
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;; Simulate the effect of eshell-sentinel.
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(eshell-close-handles (if (numberp exit-status) exit-status -1))
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(eshell-kill-process-function command exit-status)
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(or eshell-in-pipeline-p
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(setq eshell-last-sync-output-start nil))
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(if (not (numberp exit-status))
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(error "%s: external command failed: %s" command exit-status))
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(setq proc t))))
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proc))
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(defun eshell-insertion-filter (proc string)
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"Insert a string into the eshell buffer, or a process/file/buffer.
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PROC is the process for which we're inserting output. STRING is the
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output."
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(when (buffer-live-p (process-buffer proc))
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(with-current-buffer (process-buffer proc)
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(let ((entry (assq proc eshell-process-list)))
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(when entry
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(setcar (nthcdr 3 entry)
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(concat (nth 3 entry) string))
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(unless (nth 4 entry) ; already being handled?
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(while (nth 3 entry)
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(let ((data (nth 3 entry)))
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(setcar (nthcdr 3 entry) nil)
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(setcar (nthcdr 4 entry) t)
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(eshell-output-object data nil (cadr entry))
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(setcar (nthcdr 4 entry) nil)))))))))
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(defun eshell-sentinel (proc string)
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"Generic sentinel for command processes. Reports only signals.
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PROC is the process that's exiting. STRING is the exit message."
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(when (buffer-live-p (process-buffer proc))
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(with-current-buffer (process-buffer proc)
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(unwind-protect
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(let* ((entry (assq proc eshell-process-list)))
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; (if (not entry)
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; (error "Sentinel called for unowned process `%s'"
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; (process-name proc))
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(when entry
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(unwind-protect
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(progn
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(unless (string= string "run")
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(unless (string-match "^\\(finished\\|exited\\)" string)
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(eshell-insertion-filter proc string))
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(let ((handles (nth 1 entry))
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(str (prog1 (nth 3 entry)
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(setf (nth 3 entry) nil)))
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(status (process-exit-status proc)))
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;; If we're in the middle of handling output
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;; from this process then schedule the EOF for
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;; later.
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(letrec ((finish-io
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(lambda ()
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(if (nth 4 entry)
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(run-at-time 0 nil finish-io)
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(when str (eshell-output-object str nil handles))
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(eshell-close-handles status 'nil handles)))))
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(funcall finish-io)))))
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(eshell-remove-process-entry entry))))
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(eshell-kill-process-function proc string)))))
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(defun eshell-process-interact (func &optional all query)
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"Interact with a process, using PROMPT if more than one, via FUNC.
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If ALL is non-nil, background processes will be interacted with as well.
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If QUERY is non-nil, query the user with QUERY before calling FUNC."
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(let (defunct result)
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(dolist (entry eshell-process-list)
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(if (and (memq (process-status (car entry))
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'(run stop open closed))
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(or all
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(not (nth 2 entry)))
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(or (not query)
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(y-or-n-p (format-message query
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(process-name (car entry))))))
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(setq result (funcall func (car entry))))
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(unless (memq (process-status (car entry))
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'(run stop open closed))
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(setq defunct (cons entry defunct))))
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;; clean up the process list; this can get dirty if an error
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;; occurred that brought the user into the debugger, and then they
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;; quit, so that the sentinel was never called.
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(dolist (d defunct)
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(eshell-remove-process-entry d))
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result))
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(defcustom eshell-kill-process-wait-time 5
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"Seconds to wait between sending termination signals to a subprocess."
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:type 'integer
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:group 'eshell-proc)
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(defcustom eshell-kill-process-signals '(SIGINT SIGQUIT SIGKILL)
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"Signals used to kill processes when an Eshell buffer exits.
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Eshell calls each of these signals in order when an Eshell buffer is
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killed; if the process is still alive afterwards, Eshell waits a
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number of seconds defined by `eshell-kill-process-wait-time', and
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tries the next signal in the list."
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:type '(repeat symbol)
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:group 'eshell-proc)
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(defcustom eshell-kill-processes-on-exit nil
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"If non-nil, kill active processes when exiting an Eshell buffer.
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Emacs will only kill processes owned by that Eshell buffer.
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|
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If nil, ownership of background and foreground processes reverts to
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Emacs itself, and will die only if the user exits Emacs, calls
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`kill-process', or terminates the processes externally.
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If `ask', Emacs prompts the user before killing any processes.
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If `every', it prompts once for every process.
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|
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If t, it kills all buffer-owned processes without asking.
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|
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Processes are first sent SIGHUP, then SIGINT, then SIGQUIT, then
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SIGKILL. The variable `eshell-kill-process-wait-time' specifies how
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|
long to delay between signals."
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:type '(choice (const :tag "Kill all, don't ask" t)
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(const :tag "Ask before killing" ask)
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(const :tag "Ask for each process" every)
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(const :tag "Don't kill subprocesses" nil))
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:group 'eshell-proc)
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|
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(defun eshell-round-robin-kill (&optional query)
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"Kill current process by trying various signals in sequence.
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|
See the variable `eshell-kill-processes-on-exit'."
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(let ((sigs eshell-kill-process-signals))
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(while sigs
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(eshell-process-interact
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(function
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|
(lambda (proc)
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|
(signal-process (process-id proc) (car sigs)))) t query)
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(setq query nil)
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|
(if (not eshell-process-list)
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|
(setq sigs nil)
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(sleep-for eshell-kill-process-wait-time)
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|
(setq sigs (cdr sigs))))))
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|
|
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(defun eshell-query-kill-processes ()
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|
"Kill processes belonging to the current Eshell buffer, possibly w/ query."
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|
(when (and eshell-kill-processes-on-exit
|
|
eshell-process-list)
|
|
(save-window-excursion
|
|
(list-processes)
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|
(if (or (not (eq eshell-kill-processes-on-exit 'ask))
|
|
(y-or-n-p (format-message "Kill processes owned by `%s'? "
|
|
(buffer-name))))
|
|
(eshell-round-robin-kill
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|
(if (eq eshell-kill-processes-on-exit 'every)
|
|
(format-message "Kill Eshell child process `%s'? "))))
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|
(let ((buf (get-buffer "*Process List*")))
|
|
(if (and buf (buffer-live-p buf))
|
|
(kill-buffer buf)))
|
|
(message nil))))
|
|
|
|
(defun eshell-interrupt-process ()
|
|
"Interrupt a process."
|
|
(interactive)
|
|
(unless (eshell-process-interact 'interrupt-process)
|
|
(eshell-kill-process-function nil "interrupt")))
|
|
|
|
(defun eshell-kill-process ()
|
|
"Kill a process."
|
|
(interactive)
|
|
(unless (eshell-process-interact 'kill-process)
|
|
(eshell-kill-process-function nil "killed")))
|
|
|
|
(defun eshell-quit-process ()
|
|
"Send quit signal to process."
|
|
(interactive)
|
|
(unless (eshell-process-interact 'quit-process)
|
|
(eshell-kill-process-function nil "quit")))
|
|
|
|
;(defun eshell-stop-process ()
|
|
; "Send STOP signal to process."
|
|
; (interactive)
|
|
; (unless (eshell-process-interact 'stop-process)
|
|
; (eshell-kill-process-function nil "stopped")))
|
|
|
|
;(defun eshell-continue-process ()
|
|
; "Send CONTINUE signal to process."
|
|
; (interactive)
|
|
; (unless (eshell-process-interact 'continue-process)
|
|
; ;; jww (1999-09-17): this signal is not dealt with yet. For
|
|
; ;; example, `eshell-reset' will be called, and so will
|
|
; ;; `eshell-resume-eval'.
|
|
; (eshell-kill-process-function nil "continue")))
|
|
|
|
(defun eshell-send-eof-to-process ()
|
|
"Send EOF to process."
|
|
(interactive)
|
|
(eshell-send-input nil nil t)
|
|
(eshell-process-interact 'process-send-eof))
|
|
|
|
;;; esh-proc.el ends here
|