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lisp/pymacs/pymacs.el
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842
lisp/pymacs/pymacs.el
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;;; pymacs.el --- Interface between Emacs Lisp and Python
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;; Copyright © 2001-2003, 2012, 2013 Progiciels Bourbeau-Pinard inc.
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;; Author: François Pinard <pinard@iro.umontreal.ca>
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;; Maintainer: François Pinard <pinard@iro.umontreal.ca>
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;; URL: https://github.com/pinard/Pymacs
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;; Version: 0.25
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;; Keywords: Python interface protocol
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;; This program 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 2, or (at your option)
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;; any later version.
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;;
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;; This program 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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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software Foundation,
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;; Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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;;; Commentary:
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;; Pymacs is a powerful tool which, once started from Emacs, allows
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;; both-way communication between Emacs Lisp and Python. Pymacs aims
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;; Python as an extension language for Emacs rather than the other way
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;; around. Visit http://pymacs.progiciels-bpi.ca to read its manual,
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;; which also contains installation instructions.
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;;; Code:
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;; The code is organized into pages, grouping declarations by topic.
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;; Such pages are introduced by a form feed and a topic description.
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;;; Portability stunts.
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(defvar pymacs-use-hash-tables
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(and (fboundp 'make-hash-table) (fboundp 'gethash) (fboundp 'puthash))
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"Set to t if hash tables are available.")
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(eval-and-compile
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;; pymacs-called-interactively-p
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(defalias 'pymacs-called-interactively-p
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(cond ((fboundp 'called-interactively-p) 'called-interactively-p)
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;; Emacs before 22.
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(t 'interactive-p)))
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;; pymacs-cancel-timer
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(defalias 'pymacs-cancel-timer
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(cond ((fboundp 'cancel-timer) 'cancel-timer)
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;; XEmacs case - yet having post-gc-hook, this is unused.
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((fboundp 'delete-itimer) 'delete-itimer)
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(t 'ignore)))
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;; pymacs-kill-without-query
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(if (fboundp 'set-process-query-on-exit-flag)
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(defun pymacs-kill-without-query (process)
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"Tell recent Emacs how to quickly destroy PROCESS while exiting."
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(set-process-query-on-exit-flag process nil))
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(defalias 'pymacs-kill-without-query
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(if (fboundp 'process-kill-without-query-process)
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'process-kill-without-query-process
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'ignore)))
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;; pymacs-multibyte-string-p
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(cond ((fboundp 'multibyte-string-p)
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(defalias 'pymacs-multibyte-string-p 'multibyte-string-p))
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((fboundp 'find-charset-string)
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(defun pymacs-multibyte-string-p (string)
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"Tell XEmacs if STRING should be handled as multibyte."
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(not (member (find-charset-string string) '(nil (ascii))))))
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(t
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;; Tell XEmacs that STRING is unibyte, when Mule is not around!
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(defalias 'pymacs-multibyte-string-p 'ignore)))
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;; pymacs-report-error
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(defalias 'pymacs-report-error (symbol-function 'error))
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;; pymacs-set-buffer-multibyte
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(if (fboundp 'set-buffer-multibyte)
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(defalias 'pymacs-set-buffer-multibyte 'set-buffer-multibyte)
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(defun pymacs-set-buffer-multibyte (flag)
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"For use in Emacs 20.2 or earlier. Under XEmacs: no operation."
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(setq enable-multibyte-characters flag)))
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;; pymacs-timerp
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(defalias 'pymacs-timerp
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(cond ((fboundp 'timerp) 'timerp)
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;; XEmacs case - yet having post-gc-hook, this is unused.
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((fboundp 'itimerp) 'itimerp)
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(t 'ignore)))
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)
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;;; Published variables and functions.
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(defvar pymacs-python-command "python"
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"Shell command used to start Python interpreter.")
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(defvar pymacs-load-path nil
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"List of additional directories to search for Python modules.
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The directories listed will be searched first, in the order given.")
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(defvar pymacs-trace-transit '(5000 . 30000)
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"Keep the communication buffer growing, for debugging.
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When this variable is nil, the `*Pymacs*' communication buffer gets erased
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before each communication round-trip. Setting it to `t' guarantees that
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the full communication is saved, which is useful for debugging.
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It could also be given as (KEEP . LIMIT): whenever the buffer exceeds LIMIT
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bytes, it is reduced to approximately KEEP bytes.")
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(defvar pymacs-forget-mutability nil
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"Transmit copies to Python instead of Lisp handles, as much as possible.
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When this variable is nil, most mutable objects are transmitted as handles.
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This variable is meant to be temporarily rebound to force copies.")
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(defvar pymacs-mutable-strings nil
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"Prefer transmitting Lisp strings to Python as handles.
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When this variable is nil, strings are transmitted as copies, and the
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Python side thus has no way for modifying the original Lisp strings.
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This variable is ignored whenever `forget-mutability' is set.")
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(defvar pymacs-timeout-at-start 30
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"Maximum reasonable time, in seconds, for starting the Pymacs helper.
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A machine should be pretty loaded before one needs to increment this.")
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(defvar pymacs-timeout-at-reply 5
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"Expected maximum time, in seconds, to get the first line of a reply.
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The status of the Pymacs helper is checked at every such timeout.")
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(defvar pymacs-timeout-at-line 2
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"Expected maximum time, in seconds, to get another line of a reply.
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The status of the Pymacs helper is checked at every such timeout.")
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(defvar pymacs-auto-restart 'ask
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"Should the Pymacs helper be restarted whenever it dies?
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Possible values are nil, t or ask.")
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(defvar pymacs-dreadful-zombies nil
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"If zombies should trigger hard errors, whenever they get called.
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If `nil', calling a zombie will merely produce a diagnostic message.")
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(defvar pymacs-load-history nil "Pymacs loading history.")
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(defvar pymacs-after-load-functions nil
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"Special hook run after loading a Python module.
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Each function there is called with a single argument, the Python
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module name passed to as the first argument of `pymacs-load'.")
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;;;###autoload
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(defun pymacs-load (module &optional prefix noerror)
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"Import the Python module named MODULE into Emacs.
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Each function in the Python module is made available as an Emacs function.
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The Lisp name of each function is the concatenation of PREFIX with
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the Python name, in which underlines are replaced by dashes. If PREFIX is
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not given, it defaults to MODULE followed by a dash.
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If NOERROR is not nil, do not raise error when the module is not found."
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(interactive
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(let* ((module (read-string "Python module? "))
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(default (concat (car (last (split-string module "\\."))) "-"))
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(prefix (read-string (format "Prefix? [%s] " default)
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nil nil default)))
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(list module prefix)))
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(message "Pymacs loading %s..." module)
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(let ((lisp-code (pymacs-call "pymacs_load_helper" module prefix noerror)))
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(cond (lisp-code (let ((result (eval lisp-code)))
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(add-to-list 'pymacs-load-history
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(list module prefix noerror)
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;; append so that order is kept
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'append)
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(message "Pymacs loading %s...done" module)
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(run-hook-with-args 'pymacs-after-load-functions module)
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result))
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(noerror (message "Pymacs loading %s...failed" module) nil))))
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;;;###autoload
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(defun pymacs-autoload (function module &optional prefix docstring interactive)
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"Pymacs's equivalent of the standard emacs facility `autoload'.
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Define FUNCTION to autoload from Python MODULE using PREFIX.
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If PREFIX is not given, it defaults to MODULE followed by a dash.
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Optional DOCSTRING documents FUNCTION until it gets loaded.
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INTERACTIVE is normally the argument to the function `interactive',
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t means `interactive' without arguments, nil means not interactive,
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which is the default."
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(unless (symbolp function)
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(error "`%s' should be a symbol" function))
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(unless (stringp module)
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(error "`%s' should be a string" module))
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(unless (pymacs-python-reference function)
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(defalias function
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`(lambda (&rest args)
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,(or docstring
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(format "Function `%s' to be loaded from Python module `%s'"
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function module))
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,(cond ((eq interactive t) '(interactive))
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(interactive `(interactive ,interactive)))
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(pymacs-load ,module ,prefix)
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(unless (pymacs-python-reference ',function)
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(error "Pymacs autoload failed to define function %s" ',function))
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(apply ',function args)))))
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;;;###autoload
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(defun pymacs-eval (text)
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"Compile TEXT as a Python expression, and return its value."
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(interactive "sPython expression: ")
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(let ((value (pymacs-serve-until-reply "eval" `(princ ,text))))
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(when (pymacs-called-interactively-p)
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(message "%S" value))
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value))
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;;;###autoload
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(defun pymacs-exec (text)
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"Compile and execute TEXT as a sequence of Python statements.
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This functionality is experimental, and does not appear to be useful."
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(interactive "sPython statements: ")
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(let ((value (pymacs-serve-until-reply "exec" `(princ ,text))))
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(when (pymacs-called-interactively-p)
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(message "%S" value))
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value))
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;;;###autoload
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(defun pymacs-call (function &rest arguments)
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"Return the result of calling a Python function FUNCTION over ARGUMENTS.
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FUNCTION is a string denoting the Python function, ARGUMENTS are separate
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Lisp expressions, one per argument. Immutable Lisp constants are converted
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to Python equivalents, other structures are converted into Lisp handles."
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(pymacs-serve-until-reply
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"eval" `(pymacs-print-for-apply ',function ',arguments)))
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;;;###autoload
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(defun pymacs-apply (function arguments)
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"Return the result of calling a Python function FUNCTION over ARGUMENTS.
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FUNCTION is a string denoting the Python function, ARGUMENTS is a list of
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Lisp expressions. Immutable Lisp constants are converted to Python
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equivalents, other structures are converted into Lisp handles."
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(pymacs-serve-until-reply
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"eval" `(pymacs-print-for-apply ',function ',arguments)))
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;;; Integration details.
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;; This page tries to increase the integration seamlessness of Pymacs
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;; with the reminder of Emacs.
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;; Module "desktop" savagely kills `*Pymacs*' in some circumstances.
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;; Let's avoid such damage.
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(eval-after-load 'desktop
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'(push "\\*Pymacs\\*" desktop-clear-preserve-buffers))
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;; Python functions and modules should ideally look like Lisp
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;; functions and modules.
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(when t
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(defadvice documentation (around pymacs-ad-documentation activate)
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;; Integration of doc-strings.
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(let* ((reference (pymacs-python-reference function))
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(python-doc (when reference
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(pymacs-eval (format "doc_string(%s)" reference)))))
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(if (or reference python-doc)
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(setq ad-return-value
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(concat
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"It interfaces to a Python function.\n\n"
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(when python-doc
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(if raw python-doc (substitute-command-keys python-doc)))))
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ad-do-it))))
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(defun pymacs-python-reference (object)
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;; Return the text reference of a Python object if possible, else nil.
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(when (functionp object)
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(let* ((definition (indirect-function object))
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(body (and (pymacs-proper-list-p definition)
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(> (length definition) 2)
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(eq (car definition) 'lambda)
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(cddr definition))))
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(when (and body (listp (car body)) (eq (caar body) 'interactive))
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;; Skip the interactive specification of a function.
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(setq body (cdr body)))
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(when (and body
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;; Advised functions start with a string.
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(not (stringp (car body)))
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;; Python trampolines hold exactly one expression.
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(= (length body) 1))
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(let ((expression (car body)))
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;; EXPRESSION might now hold something like:
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;; (pymacs-apply (quote (pymacs-python . N)) ARGUMENT-LIST)
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(when (and (pymacs-proper-list-p expression)
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(= (length expression) 3)
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(eq (car expression) 'pymacs-apply)
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(eq (car (cadr expression)) 'quote))
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(setq object (cadr (cadr expression))))))))
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(when (eq (car-safe object) 'pymacs-python)
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(format "python[%d]" (cdr object))))
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;; The following functions are experimental -- they are not satisfactory yet.
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(defun pymacs-file-handler (operation &rest arguments)
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;; Integration of load-file, autoload, etc.
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;; Emacs might want the contents of some `MODULE.el' which does not exist,
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;; while there is a `MODULE.py' or `MODULE.pyc' file in the same directory.
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;; The goal is to generate a virtual contents for this `MODULE.el' file, as
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;; a set of Lisp trampoline functions to the Python module functions.
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;; Python modules can then be loaded or autoloaded as if they were Lisp.
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(cond ((and (eq operation 'file-readable-p)
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(let ((module (substring (car arguments) 0 -3)))
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(or (pymacs-file-force operation arguments)
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(file-readable-p (concat module ".py"))
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(file-readable-p (concat module ".pyc"))))))
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((and (eq operation 'load)
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(not (pymacs-file-force
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'file-readable-p (list (car arguments))))
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(file-readable-p (car arguments)))
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(let ((lisp-code (pymacs-call "pymacs_load_helper"
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(substring (car arguments) 0 -3)
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nil)))
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(unless lisp-code
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(pymacs-report-error "Python import error"))
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(eval lisp-code)))
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((and (eq operation 'insert-file-contents)
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(not (pymacs-file-force
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'file-readable-p (list (car arguments))))
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(file-readable-p (car arguments)))
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(let ((lisp-code (pymacs-call "pymacs_load_helper"
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(substring (car arguments) 0 -3)
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nil)))
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(unless lisp-code
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(pymacs-report-error "Python import error"))
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(insert (prin1-to-string lisp-code))))
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(t (pymacs-file-force operation arguments))))
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(defun pymacs-file-force (operation arguments)
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;; Bypass the file handler.
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(let ((inhibit-file-name-handlers
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(cons 'pymacs-file-handler
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(and (eq inhibit-file-name-operation operation)
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inhibit-file-name-handlers)))
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(inhibit-file-name-operation operation))
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(apply operation arguments)))
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;;(add-to-list 'file-name-handler-alist '("\\.el\\'" . pymacs-file-handler))
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;;; Gargabe collection of Python IDs.
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;; Python objects which have no Lisp representation are allocated on the
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;; Python side as `python[INDEX]', and INDEX is transmitted to Emacs, with
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;; the value to use on the Lisp side for it. Whenever Lisp does not need a
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;; Python object anymore, it should be freed on the Python side. The
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;; following variables and functions are meant to fill this duty.
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(defvar pymacs-used-ids nil
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"List of received IDs, currently allocated on the Python side.")
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;; This is set whenever the Pymacs helper successfully starts, and is
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;; also used to later detect the death of a previous helper. If
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;; pymacs-use-hash-tables is unset, this variable receives `t' when
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;; the helper starts, so the detection works nevertheless.
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(defvar pymacs-weak-hash nil
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"Weak hash table, meant to find out which IDs are still needed.")
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(defvar pymacs-gc-wanted nil
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"Flag that it is desirable to clean up unused IDs on the Python side.")
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(defvar pymacs-gc-inhibit nil
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"Flag that a new Pymacs garbage collection should just not run now.")
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(defvar pymacs-gc-timer nil
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"Timer to trigger Pymacs garbage collection at regular time intervals.
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The timer is used only if `post-gc-hook' is not available.")
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(defun pymacs-schedule-gc (&optional xemacs-list)
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(unless pymacs-gc-inhibit
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(setq pymacs-gc-wanted t)))
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(defun pymacs-garbage-collect ()
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;; Clean up unused IDs on the Python side.
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(when (and pymacs-use-hash-tables (not pymacs-gc-inhibit))
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(let ((pymacs-gc-inhibit t)
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(pymacs-forget-mutability t)
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(ids pymacs-used-ids)
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used-ids unused-ids)
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(while ids
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(let ((id (car ids)))
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(setq ids (cdr ids))
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(if (gethash id pymacs-weak-hash)
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(setq used-ids (cons id used-ids))
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(setq unused-ids (cons id unused-ids)))))
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(setq pymacs-used-ids used-ids
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pymacs-gc-wanted nil)
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(when unused-ids
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(let ((pymacs-forget-mutability t))
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(pymacs-call "free_python" unused-ids))))))
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(defun pymacs-defuns (arguments)
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;; Take one argument, a list holding a number of items divisible by 3. The
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;; first argument is an INDEX, the second is a NAME, the third is the
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;; INTERACTION specification, and so forth. Register Python INDEX with a
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;; function with that NAME and INTERACTION on the Lisp side. The strange
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;; calling convention is to minimise quoting at call time.
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(while (>= (length arguments) 3)
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(let ((index (nth 0 arguments))
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(name (nth 1 arguments))
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(interaction (nth 2 arguments)))
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(fset name (pymacs-defun index interaction))
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(setq arguments (nthcdr 3 arguments)))))
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(defun pymacs-defun (index interaction)
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;; Register INDEX on the Lisp side with a Python object that is a function,
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;; and return a lambda form calling that function. If the INTERACTION
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;; specification is nil, the function is not interactive. Otherwise, the
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;; function is interactive, INTERACTION is then either a string, or the
|
||||
;; index of an argument-less Python function returning the argument list.
|
||||
(let ((object (pymacs-python index)))
|
||||
(cond ((null interaction)
|
||||
`(lambda (&rest arguments)
|
||||
(pymacs-apply ',object arguments)))
|
||||
((stringp interaction)
|
||||
`(lambda (&rest arguments)
|
||||
(interactive ,interaction)
|
||||
(pymacs-apply ',object arguments)))
|
||||
(t `(lambda (&rest arguments)
|
||||
(interactive (pymacs-call ',(pymacs-python interaction)))
|
||||
(pymacs-apply ',object arguments))))))
|
||||
|
||||
(defun pymacs-python (index)
|
||||
;; Register on the Lisp side a Python object having INDEX, and return it.
|
||||
;; The result is meant to be recognised specially by `print-for-eval', and
|
||||
;; in the function position by `print-for-apply'.
|
||||
(let ((object (cons 'pymacs-python index)))
|
||||
(when pymacs-use-hash-tables
|
||||
(puthash index object pymacs-weak-hash)
|
||||
(setq pymacs-used-ids (cons index pymacs-used-ids)))
|
||||
object))
|
||||
|
||||
;;; Generating Python code.
|
||||
|
||||
;; Many Lisp expressions cannot fully be represented in Python, at least
|
||||
;; because the object is mutable on the Lisp side. Such objects are allocated
|
||||
;; somewhere into a vector of handles, and the handle index is used for
|
||||
;; communication instead of the expression itself.
|
||||
|
||||
(defvar pymacs-lisp nil
|
||||
"Vector of handles to hold transmitted expressions.")
|
||||
|
||||
(defvar pymacs-freed-list nil
|
||||
"List of unallocated indices in Lisp.")
|
||||
|
||||
;; When the Python GC is done with a Lisp object, a communication occurs so to
|
||||
;; free the object on the Lisp side as well.
|
||||
|
||||
(defun pymacs-allocate-lisp (expression)
|
||||
;; This function allocates some handle for an EXPRESSION, and return its
|
||||
;; index.
|
||||
(unless pymacs-freed-list
|
||||
(let* ((previous pymacs-lisp)
|
||||
(old-size (length previous))
|
||||
(new-size (if (zerop old-size) 100 (+ old-size (/ old-size 2))))
|
||||
(counter new-size))
|
||||
(setq pymacs-lisp (make-vector new-size nil))
|
||||
(while (> counter 0)
|
||||
(setq counter (1- counter))
|
||||
(if (< counter old-size)
|
||||
(aset pymacs-lisp counter (aref previous counter))
|
||||
(setq pymacs-freed-list (cons counter pymacs-freed-list))))))
|
||||
(let ((index (car pymacs-freed-list)))
|
||||
(setq pymacs-freed-list (cdr pymacs-freed-list))
|
||||
(aset pymacs-lisp index expression)
|
||||
index))
|
||||
|
||||
(defun pymacs-free-lisp (indices)
|
||||
;; This function is triggered from Python side for Lisp handles which lost
|
||||
;; their last reference. These references should be cut on the Lisp side as
|
||||
;; well, or else, the objects will never be garbage-collected.
|
||||
(while indices
|
||||
(let ((index (car indices)))
|
||||
(aset pymacs-lisp index nil)
|
||||
(setq pymacs-freed-list (cons index pymacs-freed-list)
|
||||
indices (cdr indices)))))
|
||||
|
||||
(defun pymacs-print-for-apply (function arguments)
|
||||
;; This function prints a Python expression calling FUNCTION, which is a
|
||||
;; string naming a Python function, or a Python reference, over all its
|
||||
;; ARGUMENTS, which are Lisp expressions.
|
||||
(let ((separator "")
|
||||
argument)
|
||||
(if (eq (car-safe function) 'pymacs-python)
|
||||
(princ (format "python[%d]" (cdr function)))
|
||||
(princ function))
|
||||
(princ "(")
|
||||
(while arguments
|
||||
(setq argument (car arguments)
|
||||
arguments (cdr arguments))
|
||||
(princ separator)
|
||||
(setq separator ", ")
|
||||
(pymacs-print-for-eval argument))
|
||||
(princ ")")))
|
||||
|
||||
(defun pymacs-print-for-eval (expression)
|
||||
;; This function prints a Python expression out of a Lisp EXPRESSION.
|
||||
(let (done)
|
||||
(cond ((not expression)
|
||||
(princ "None")
|
||||
(setq done t))
|
||||
((eq expression t)
|
||||
(princ "True")
|
||||
(setq done t))
|
||||
((numberp expression)
|
||||
(princ expression)
|
||||
(setq done t))
|
||||
((stringp expression)
|
||||
(when (or pymacs-forget-mutability
|
||||
(not pymacs-mutable-strings))
|
||||
(let* ((multibyte (pymacs-multibyte-string-p expression))
|
||||
(text (if multibyte
|
||||
(encode-coding-string expression 'utf-8)
|
||||
(copy-sequence expression))))
|
||||
(set-text-properties 0 (length text) nil text)
|
||||
(when multibyte
|
||||
(princ "b"))
|
||||
(princ (mapconcat 'identity
|
||||
(split-string (prin1-to-string text) "\n")
|
||||
"\\n"))
|
||||
(when multibyte
|
||||
(princ ".decode('UTF-8')")))
|
||||
(setq done t)))
|
||||
((symbolp expression)
|
||||
(let ((name (symbol-name expression)))
|
||||
;; The symbol can only be transmitted when in the main oblist.
|
||||
(when (eq expression (intern-soft name))
|
||||
(princ "lisp[")
|
||||
(prin1 name)
|
||||
(princ "]")
|
||||
(setq done t))))
|
||||
((vectorp expression)
|
||||
(when pymacs-forget-mutability
|
||||
(let ((limit (length expression))
|
||||
(counter 0))
|
||||
(princ "(")
|
||||
(while (< counter limit)
|
||||
(unless (zerop counter)
|
||||
(princ ", "))
|
||||
(pymacs-print-for-eval (aref expression counter))
|
||||
(setq counter (1+ counter)))
|
||||
(when (= limit 1)
|
||||
(princ ","))
|
||||
(princ ")")
|
||||
(setq done t))))
|
||||
((eq (car-safe expression) 'pymacs-python)
|
||||
(princ "python[")
|
||||
(princ (cdr expression))
|
||||
(princ "]")
|
||||
(setq done t))
|
||||
((pymacs-proper-list-p expression)
|
||||
(when pymacs-forget-mutability
|
||||
(princ "[")
|
||||
(pymacs-print-for-eval (car expression))
|
||||
(while (setq expression (cdr expression))
|
||||
(princ ", ")
|
||||
(pymacs-print-for-eval (car expression)))
|
||||
(princ "]")
|
||||
(setq done t))))
|
||||
(unless done
|
||||
(let ((class (cond ((vectorp expression) "Vector")
|
||||
((and pymacs-use-hash-tables
|
||||
(hash-table-p expression))
|
||||
"Table")
|
||||
((bufferp expression) "Buffer")
|
||||
((pymacs-proper-list-p expression) "List")
|
||||
(t "Lisp"))))
|
||||
(princ class)
|
||||
(princ "(")
|
||||
(princ (pymacs-allocate-lisp expression))
|
||||
(princ ")")))))
|
||||
|
||||
;;; Communication protocol.
|
||||
|
||||
(defvar pymacs-transit-buffer nil
|
||||
"Communication buffer between Emacs and Python.")
|
||||
|
||||
;; The principle behind the communication protocol is that it is easier to
|
||||
;; generate than parse, and that each language already has its own parser.
|
||||
;; So, the Emacs side generates Python text for the Python side to interpret,
|
||||
;; while the Python side generates Lisp text for the Lisp side to interpret.
|
||||
;; About nothing but expressions are transmitted, which are evaluated on
|
||||
;; arrival. The pseudo `reply' function is meant to signal the final result
|
||||
;; of a series of exchanges following a request, while the pseudo `error'
|
||||
;; function is meant to explain why an exchange could not have been completed.
|
||||
|
||||
;; The protocol itself is rather simple, and contains human readable text
|
||||
;; only. A message starts at the beginning of a line in the communication
|
||||
;; buffer, either with `>' for the Lisp to Python direction, or `<' for the
|
||||
;; Python to Lisp direction. This is followed by a decimal number giving the
|
||||
;; length of the message text, a TAB character, and the message text itself.
|
||||
;; Message direction alternates systematically between messages, it never
|
||||
;; occurs that two successive messages are sent in the same direction. The
|
||||
;; first message is received from the Python side, it is `(version VERSION)'.
|
||||
|
||||
(defun pymacs-start-services ()
|
||||
;; This function gets called automatically, as needed.
|
||||
(let ((buffer (get-buffer-create "*Pymacs*")))
|
||||
(with-current-buffer buffer
|
||||
;; Erase the buffer in case some previous incarnation of the
|
||||
;; Pymacs helper died. Otherwise, the "(goto-char (point-min))"
|
||||
;; below might not find the proper synchronising reply and later
|
||||
;; trigger a spurious "Protocol error" diagnostic.
|
||||
(erase-buffer)
|
||||
(buffer-disable-undo)
|
||||
(pymacs-set-buffer-multibyte nil)
|
||||
(set-buffer-file-coding-system 'raw-text)
|
||||
(save-match-data
|
||||
;; Launch the Pymacs helper.
|
||||
(let ((process
|
||||
(apply 'start-process "pymacs" buffer
|
||||
(let ((python (getenv "PYMACS_PYTHON")))
|
||||
(if (or (null python) (equal python ""))
|
||||
pymacs-python-command
|
||||
python))
|
||||
"-c" (concat "import sys;"
|
||||
" from Pymacs import main;"
|
||||
" main(*sys.argv[1:])")
|
||||
(append
|
||||
(and (>= emacs-major-version 24) '("-f"))
|
||||
(mapcar 'expand-file-name pymacs-load-path)))))
|
||||
(pymacs-kill-without-query process)
|
||||
;; Receive the synchronising reply.
|
||||
(while (progn
|
||||
(goto-char (point-min))
|
||||
(not (re-search-forward "<\\([0-9]+\\)\t" nil t)))
|
||||
(unless (accept-process-output process pymacs-timeout-at-start)
|
||||
(pymacs-report-error
|
||||
"Pymacs helper did not start within %d seconds"
|
||||
pymacs-timeout-at-start)))
|
||||
(let ((marker (process-mark process))
|
||||
(limit-position (+ (match-end 0)
|
||||
(string-to-number (match-string 1)))))
|
||||
(while (< (marker-position marker) limit-position)
|
||||
(unless (accept-process-output process pymacs-timeout-at-start)
|
||||
(pymacs-report-error
|
||||
"Pymacs helper probably was interrupted at start")))))
|
||||
;; Check that synchronisation occurred.
|
||||
(goto-char (match-end 0))
|
||||
(let ((reply (read (current-buffer))))
|
||||
(if (and (pymacs-proper-list-p reply)
|
||||
(= (length reply) 2)
|
||||
(eq (car reply) 'version))
|
||||
(unless (string-equal (cadr reply) "0.25")
|
||||
(pymacs-report-error
|
||||
"Pymacs Lisp version is 0.25, Python is %s"
|
||||
(cadr reply)))
|
||||
(pymacs-report-error "Pymacs got an invalid initial reply")))))
|
||||
(if (not pymacs-use-hash-tables)
|
||||
(setq pymacs-weak-hash t)
|
||||
(when pymacs-used-ids
|
||||
;; A previous Pymacs session occurred in this Emacs session,
|
||||
;; some IDs hang around which do not correspond to anything on
|
||||
;; the Python side. Python should not recycle such IDs for
|
||||
;; new objects.
|
||||
(let ((pymacs-transit-buffer buffer)
|
||||
(pymacs-forget-mutability t)
|
||||
(pymacs-gc-inhibit t))
|
||||
(pymacs-call "zombie_python" pymacs-used-ids))
|
||||
(setq pymacs-used-ids nil))
|
||||
(setq pymacs-weak-hash (make-hash-table :weakness 'value))
|
||||
(if (boundp 'post-gc-hook)
|
||||
(add-hook 'post-gc-hook 'pymacs-schedule-gc)
|
||||
(setq pymacs-gc-timer (run-at-time 20 20 'pymacs-schedule-gc))))
|
||||
;; If nothing failed, only then declare that Pymacs has started!
|
||||
(setq pymacs-transit-buffer buffer)
|
||||
(let ((modules pymacs-load-history))
|
||||
(setq pymacs-load-history nil)
|
||||
(when (and modules (yes-or-no-p "Reload modules in previous session? "))
|
||||
(mapc (lambda (args)
|
||||
;; Be defensive in case sys.path differs
|
||||
(condition-case err
|
||||
(apply 'pymacs-load args)
|
||||
(error
|
||||
(message "%s: %s" (car err) (error-message-string err)))))
|
||||
modules)))))
|
||||
|
||||
(defun pymacs-terminate-services ()
|
||||
;; This function is mainly provided for documentation purposes.
|
||||
(interactive)
|
||||
(garbage-collect)
|
||||
(pymacs-garbage-collect)
|
||||
(when (or (not pymacs-used-ids)
|
||||
(yes-or-no-p "\
|
||||
Killing the Pymacs helper might create zombie objects. Kill? "))
|
||||
(cond ((boundp 'post-gc-hook)
|
||||
(remove-hook 'post-gc-hook 'pymacs-schedule-gc))
|
||||
((pymacs-timerp pymacs-gc-timer)
|
||||
(pymacs-cancel-timer pymacs-gc-timer)))
|
||||
(when (buffer-live-p pymacs-transit-buffer)
|
||||
(kill-buffer pymacs-transit-buffer))
|
||||
(setq pymacs-gc-inhibit nil
|
||||
pymacs-gc-timer nil
|
||||
pymacs-transit-buffer nil
|
||||
pymacs-lisp nil
|
||||
pymacs-freed-list nil)))
|
||||
|
||||
(defun pymacs-serve-until-reply (action inserter)
|
||||
;; This function builds a Python request by printing ACTION and
|
||||
;; evaluating INSERTER, which itself prints an argument. It then
|
||||
;; sends the request to the Pymacs helper, and serves all
|
||||
;; sub-requests coming from the Python side, until either a reply or
|
||||
;; an error is finally received.
|
||||
(unless (and pymacs-transit-buffer
|
||||
(buffer-name pymacs-transit-buffer)
|
||||
(get-buffer-process pymacs-transit-buffer))
|
||||
(when pymacs-weak-hash
|
||||
(unless (or (eq pymacs-auto-restart t)
|
||||
(and (eq pymacs-auto-restart 'ask)
|
||||
(yes-or-no-p "The Pymacs helper died. Restart it? ")))
|
||||
(pymacs-report-error "There is no Pymacs helper!")))
|
||||
(pymacs-start-services))
|
||||
(when pymacs-gc-wanted
|
||||
(pymacs-garbage-collect))
|
||||
(let ((inhibit-quit t)
|
||||
done value)
|
||||
(while (not done)
|
||||
(let ((form (pymacs-round-trip action inserter)))
|
||||
(setq action (car form))
|
||||
(when (eq action 'free)
|
||||
(pymacs-free-lisp (cadr form))
|
||||
(setq form (cddr form)
|
||||
action (car form)))
|
||||
(let* ((pair (pymacs-interruptible-eval (cadr form)))
|
||||
(success (cdr pair)))
|
||||
(setq value (car pair))
|
||||
(cond ((eq action 'eval)
|
||||
(if success
|
||||
(setq action "return"
|
||||
inserter `(pymacs-print-for-eval ',value))
|
||||
(setq action "raise"
|
||||
inserter `(let ((pymacs-forget-mutability t))
|
||||
(pymacs-print-for-eval ,value)))))
|
||||
((eq action 'expand)
|
||||
(if success
|
||||
(setq action "return"
|
||||
inserter `(let ((pymacs-forget-mutability t))
|
||||
(pymacs-print-for-eval ,value)))
|
||||
(setq action "raise"
|
||||
inserter `(let ((pymacs-forget-mutability t))
|
||||
(pymacs-print-for-eval ,value)))))
|
||||
((eq action 'return)
|
||||
(if success
|
||||
(setq done t)
|
||||
(pymacs-report-error "%s" value)))
|
||||
((eq action 'raise)
|
||||
(if success
|
||||
(pymacs-report-error "Python: %s" value)
|
||||
(pymacs-report-error "%s" value)))
|
||||
(t (pymacs-report-error "Protocol error: %s" form))))))
|
||||
value))
|
||||
|
||||
(defun pymacs-round-trip (action inserter)
|
||||
;; This function produces a Python request by printing and
|
||||
;; evaluating INSERTER, which itself prints an argument. It sends
|
||||
;; the request to the Pymacs helper, awaits for any kind of reply,
|
||||
;; and returns it.
|
||||
(with-current-buffer pymacs-transit-buffer
|
||||
;; Possibly trim the beginning of the transit buffer.
|
||||
(cond ((not pymacs-trace-transit)
|
||||
(erase-buffer))
|
||||
((consp pymacs-trace-transit)
|
||||
(when (> (buffer-size) (cdr pymacs-trace-transit))
|
||||
(let ((cut (- (buffer-size) (car pymacs-trace-transit))))
|
||||
(when (> cut 0)
|
||||
(save-excursion
|
||||
(goto-char cut)
|
||||
(unless (memq (preceding-char) '(0 ?\n))
|
||||
(forward-line 1))
|
||||
(delete-region (point-min) (point))))))))
|
||||
;; Send the request, wait for a reply, and process it.
|
||||
(let* ((process (get-buffer-process pymacs-transit-buffer))
|
||||
(status (process-status process))
|
||||
(marker (process-mark process))
|
||||
(moving (= (point) marker))
|
||||
send-position reply-position reply)
|
||||
(save-excursion
|
||||
(save-match-data
|
||||
;; Encode request.
|
||||
(setq send-position (marker-position marker))
|
||||
(let ((standard-output marker))
|
||||
(princ action)
|
||||
(princ " ")
|
||||
(eval inserter))
|
||||
(goto-char marker)
|
||||
(unless (= (preceding-char) ?\n)
|
||||
(princ "\n" marker))
|
||||
;; Send request text.
|
||||
(goto-char send-position)
|
||||
(insert (format ">%d\t" (- marker send-position)))
|
||||
(setq reply-position (marker-position marker))
|
||||
(process-send-region process send-position marker)
|
||||
;; Receive reply text.
|
||||
(while (and (eq status 'run)
|
||||
(progn
|
||||
(goto-char reply-position)
|
||||
(not (re-search-forward "<\\([0-9]+\\)\t" nil t))))
|
||||
(unless (accept-process-output process pymacs-timeout-at-reply)
|
||||
(setq status (process-status process))))
|
||||
(when (eq status 'run)
|
||||
(let ((limit-position (+ (match-end 0)
|
||||
(string-to-number (match-string 1)))))
|
||||
(while (and (eq status 'run)
|
||||
(< (marker-position marker) limit-position))
|
||||
(unless (accept-process-output process pymacs-timeout-at-line)
|
||||
(setq status (process-status process))))))
|
||||
;; Decode reply.
|
||||
(if (not (eq status 'run))
|
||||
(pymacs-report-error "Pymacs helper status is `%S'" status)
|
||||
(goto-char (match-end 0))
|
||||
(setq reply (read (current-buffer))))))
|
||||
(when (and moving (not pymacs-trace-transit))
|
||||
(goto-char marker))
|
||||
reply)))
|
||||
|
||||
(defun pymacs-interruptible-eval (expression)
|
||||
;; This function produces a pair (VALUE . SUCCESS) for EXPRESSION.
|
||||
;; A cautious evaluation of EXPRESSION is attempted, and any
|
||||
;; error while evaluating is caught, including Emacs quit (C-g).
|
||||
;; Any Emacs quit also gets forward as a SIGINT to the Pymacs handler.
|
||||
;; With SUCCESS being true, VALUE is the expression value.
|
||||
;; With SUCCESS being false, VALUE is an interruption diagnostic.
|
||||
(condition-case info
|
||||
(cons (let ((inhibit-quit nil)) (eval expression)) t)
|
||||
(quit (setq quit-flag t)
|
||||
(interrupt-process pymacs-transit-buffer)
|
||||
(cons "*Interrupted!*" nil))
|
||||
(error (cons (prin1-to-string info) nil))))
|
||||
|
||||
(defun pymacs-proper-list-p (expression)
|
||||
;; Tell if a list is proper, id est, that it is `nil' or ends with `nil'.
|
||||
(cond ((not expression))
|
||||
((consp expression) (not (cdr (last expression))))))
|
||||
|
||||
(provide 'pymacs)
|
||||
;;; pymacs.el ends here
|
||||
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Reference in New Issue
Block a user