302 lines
11 KiB
EmacsLisp
302 lines
11 KiB
EmacsLisp
;;; guix-backend.el --- Communication with Geiser
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;; Copyright © 2014 Alex Kost <alezost@gmail.com>
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;; This file is part of GNU Guix.
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;; GNU Guix 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 Guix 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 this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file provides the code for interacting with Guile using Geiser.
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;; By default (if `guix-use-guile-server' is non-nil) 2 Geiser REPLs are
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;; started. The main one (with "guile --listen" process) is used for
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;; "interacting" with a user - for showing a progress of
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;; installing/deleting Guix packages. The second (internal) REPL is
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;; used for synchronous evaluating, e.g. when information about
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;; packages/generations should be received for a list/info buffer.
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;;
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;; This "2 REPLs concept" makes it possible to have a running process of
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;; installing/deleting packages and to continue to search/list/get info
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;; about other packages at the same time. If you prefer to use a single
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;; Guix REPL, do not try to receive any information while there is a
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;; running code in the REPL (see
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;; <https://github.com/jaor/geiser/issues/28>).
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;;
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;; If you need to use "guix.el" in another Emacs (i.e. when there is
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;; a runnig "guile --listen..." REPL somewhere), you can either change
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;; `guix-default-port' in that Emacs instance or set
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;; `guix-use-guile-server' to t.
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;;
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;; Guix REPLs (unlike the usual Geiser REPLs) are not added to
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;; `geiser-repl--repls' variable, and thus cannot be used for evaluating
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;; while editing scm-files. The only purpose of Guix REPLs is to be an
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;; intermediate between "Guix/Guile level" and "Emacs interface level".
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;; That being said you can still want to use a Guix REPL while hacking
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;; auxiliary scheme-files for "guix.el". You can just use "M-x
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;; connect-to-guile" (connect to "localhost" and `guix-default-port') to
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;; have a usual Geiser REPL with all stuff defined by "guix.el" package.
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;;; Code:
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(require 'geiser-mode)
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(defvar guix-load-path
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(file-name-directory (or load-file-name
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(locate-library "guix")))
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"Directory with scheme files for \"guix.el\" package.")
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(defvar guix-helper-file
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(expand-file-name "guix-helper.scm" guix-load-path)
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"Auxiliary scheme file for loading.")
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(defvar guix-guile-program (or geiser-guile-binary "guile")
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"Name of the guile executable used for Guix REPL.
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May be either a string (the name of the executable) or a list of
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strings of the form:
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(NAME . ARGS)
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Where ARGS is a list of arguments to the guile program.")
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;;; REPL
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(defgroup guix-repl nil
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"Settings for Guix REPLs."
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:prefix "guix-repl-"
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:group 'guix)
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(defcustom guix-repl-startup-time 30000
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"Time, in milliseconds, to wait for Guix REPL to startup.
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Same as `geiser-repl-startup-time' but is used for Guix REPL.
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If you have a slow system, try to increase this time."
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:type 'integer
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:group 'guix-repl)
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(defcustom guix-repl-buffer-name "*Guix REPL*"
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"Default name of a Geiser REPL buffer used for Guix."
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:type 'string
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:group 'guix-repl)
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(defcustom guix-after-start-repl-hook ()
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"Hook called after Guix REPL is started."
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:type 'hook
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:group 'guix-repl)
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(defcustom guix-use-guile-server t
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"If non-nil, start guile with '--listen' argument.
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This allows to receive information about packages using an additional
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REPL while some packages are being installed/removed in the main REPL."
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:type 'boolean
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:group 'guix-repl)
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(defcustom guix-default-port 37246
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"Default port used if `guix-use-guile-server' is non-nil."
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:type 'integer
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:group 'guix-repl)
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(defvar guix-repl-buffer nil
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"Main Geiser REPL buffer used for communicating with Guix.
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This REPL is used for processing package actions and for
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receiving information if `guix-use-guile-server' is nil.")
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(defvar guix-internal-repl-buffer nil
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"Additional Geiser REPL buffer used for communicating with Guix.
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This REPL is used for receiving information only if
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`guix-use-guile-server' is non-nil.")
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(defvar guix-internal-repl-buffer-name "*Guix Internal REPL*"
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"Default name of an internal Guix REPL buffer.")
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(defun guix-get-guile-program (&optional internal)
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"Return a value suitable for `geiser-guile-binary'."
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(if (or internal
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(not guix-use-guile-server))
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guix-guile-program
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(append (if (listp guix-guile-program)
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guix-guile-program
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(list guix-guile-program))
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;; Guile understands "--listen=..." but not "--listen ..."
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(list (concat "--listen="
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(number-to-string guix-default-port))))))
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(defun guix-start-process-maybe ()
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"Start Geiser REPL configured for Guix if needed."
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(guix-start-repl-maybe)
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(if guix-use-guile-server
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(guix-start-repl-maybe 'internal)
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(setq guix-internal-repl-buffer guix-repl-buffer)))
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(defun guix-start-repl-maybe (&optional internal)
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"Start Guix REPL if needed.
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If INTERNAL is non-nil, start an internal REPL."
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(let* ((repl-var (guix-get-repl-buffer-variable internal))
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(repl (symbol-value repl-var)))
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(unless (and (buffer-live-p repl)
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(get-buffer-process repl))
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;; Kill REPL buffer with a dead process
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(and (buffer-live-p repl) (kill-buffer repl))
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(or internal
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(message "Starting Geiser REPL for Guix ..."))
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(let ((geiser-guile-binary (guix-get-guile-program internal))
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(geiser-guile-init-file (or internal guix-helper-file))
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(repl (get-buffer-create
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(guix-get-repl-buffer-name internal))))
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(condition-case err
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(guix-start-repl repl
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(and internal
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(geiser-repl--read-address
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"localhost" guix-default-port)))
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(text-read-only
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(error (concat "Couldn't start Guix REPL. Perhaps the port %s is busy.\n"
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"See buffer '%s' for details")
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guix-default-port (buffer-name repl))))
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(set repl-var repl)
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(unless internal
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(message "Guix REPL has been started.")
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(run-hooks 'guix-after-start-repl-hook))))))
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(defun guix-start-repl (buffer &optional address)
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"Start Guix REPL in BUFFER.
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If ADDRESS is non-nil, connect to a remote guile process using
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this address (it should be defined by
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`geiser-repl--read-address')."
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;; A mix of the code from `geiser-repl--start-repl' and
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;; `geiser-repl--to-repl-buffer'.
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(let ((impl 'guile)
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(geiser-guile-load-path (list guix-load-path))
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(geiser-repl-startup-time guix-repl-startup-time))
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(with-current-buffer buffer
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(geiser-repl-mode)
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(geiser-impl--set-buffer-implementation impl)
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(geiser-repl--autodoc-mode -1)
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(goto-char (point-max))
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(let* ((prompt-re (geiser-repl--prompt-regexp impl))
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(deb-prompt-re (geiser-repl--debugger-prompt-regexp impl))
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(prompt (geiser-con--combined-prompt prompt-re deb-prompt-re)))
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(or prompt-re
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(error "Oh no! Guix REPL in the buffer '%s' has not been started"
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(buffer-name buffer)))
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(geiser-repl--save-remote-data address)
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(geiser-repl--start-scheme impl address prompt)
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(geiser-repl--quit-setup)
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(geiser-repl--history-setup)
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(setq-local geiser-repl--repls (list buffer))
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(geiser-repl--set-this-buffer-repl buffer)
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(setq geiser-repl--connection
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(geiser-con--make-connection
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(get-buffer-process (current-buffer))
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prompt-re
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deb-prompt-re))
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(geiser-repl--startup impl address)
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(geiser-repl--autodoc-mode 1)
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(geiser-company--setup geiser-repl-company-p)
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(add-hook 'comint-output-filter-functions
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'geiser-repl--output-filter
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nil t)
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(set-process-query-on-exit-flag
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(get-buffer-process (current-buffer))
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geiser-repl-query-on-kill-p)))))
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(defun guix-get-repl-buffer (&optional internal)
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"Return Guix REPL buffer; start REPL if needed.
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If INTERNAL is non-nil, return an additional internal REPL."
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(guix-start-process-maybe)
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(let ((repl (symbol-value (guix-get-repl-buffer-variable internal))))
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;; If a new Geiser REPL is started, `geiser-repl--repl' variable may
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;; be set to the new value in a Guix REPL, so set it back to a
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;; proper value here.
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(with-current-buffer repl
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(geiser-repl--set-this-buffer-repl repl))
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repl))
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(defun guix-get-repl-buffer-variable (&optional internal)
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"Return the name of a variable with a REPL buffer."
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(if internal
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'guix-internal-repl-buffer
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'guix-repl-buffer))
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(defun guix-get-repl-buffer-name (&optional internal)
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"Return the name of a REPL buffer."
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(if internal
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guix-internal-repl-buffer-name
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guix-repl-buffer-name))
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(defun guix-switch-to-repl (&optional internal)
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"Switch to Guix REPL.
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If INTERNAL is non-nil (interactively with prefix), switch to the
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additional internal REPL if it exists."
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(interactive "P")
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(geiser-repl--switch-to-buffer (guix-get-repl-buffer internal)))
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;;; Evaluating expressions
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(defun guix-make-guile-expression (fun &rest args)
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"Return string containing a guile expression for calling FUN with ARGS."
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(format "(%S %s)" fun
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(mapconcat
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(lambda (arg)
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(cond
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((null arg) "'()")
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((or (eq arg t)
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;; An ugly hack to separate 'false' from nil
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(equal arg 'f)
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(keywordp arg))
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(concat "#" (prin1-to-string arg t)))
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((or (symbolp arg) (listp arg))
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(concat "'" (prin1-to-string arg)))
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(t (prin1-to-string arg))))
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args
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" ")))
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(defun guix-eval (str &optional wrap)
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"Evaluate guile expression STR.
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If WRAP is non-nil, wrap STR into (begin ...) form.
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Return a list of strings with result values of evaluation."
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(with-current-buffer (guix-get-repl-buffer 'internal)
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(let* ((wrapped (if wrap (geiser-debug--wrap-region str) str))
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(code `(:eval (:scm ,wrapped)))
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(ret (geiser-eval--send/wait code)))
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(if (geiser-eval--retort-error ret)
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(error "Error in evaluating guile expression: %s"
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(geiser-eval--retort-output ret))
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(cdr (assq 'result ret))))))
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(defun guix-eval-read (str &optional wrap)
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"Evaluate guile expression STR.
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For the meaning of WRAP, see `guix-eval'.
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Return elisp expression of the first result value of evaluation."
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;; Parsing scheme code with elisp `read' is probably not the best idea.
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(read (replace-regexp-in-string
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"#f\\|#<unspecified>" "nil"
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(replace-regexp-in-string
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"#t" "t" (car (guix-eval str wrap))))))
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(defun guix-eval-in-repl (str)
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"Switch to Guix REPL and evaluate STR with guile expression there."
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(let ((repl (guix-get-repl-buffer)))
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(with-current-buffer repl
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(delete-region (geiser-repl--last-prompt-end) (point-max))
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(goto-char (point-max))
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(insert str)
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(geiser-repl--send-input))
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(geiser-repl--switch-to-buffer repl)))
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(provide 'guix-backend)
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;;; guix-backend.el ends here
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