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;;; guix-geiser.el --- Interacting with Geiser -*- lexical-binding: t -*-
;; Copyright © 2015 Alex Kost <alezost@gmail.com>
;; This file is part of GNU Guix.
;; GNU Guix is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Guix is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This file provides functions to evaluate guile code using Geiser.
;;; Code:
(require 'geiser-mode)
(require 'guix-guile)
(defun guix-geiser-repl ()
"Return the current Geiser REPL."
(or geiser-repl--repl
(geiser-repl--repl/impl 'guile)
(error "Geiser REPL not found")))
(defun guix-geiser-eval (str &optional repl)
"Evaluate STR with guile expression using Geiser REPL.
If REPL is nil, use the current Geiser REPL.
Return a list of strings with result values of evaluation."
(with-current-buffer (or repl (guix-geiser-repl))
(let ((res (geiser-eval--send/wait `(:eval (:scm ,str)))))
(if (geiser-eval--retort-error res)
(error "Error in evaluating guile expression: %s"
(geiser-eval--retort-output res))
(cdr (assq 'result res))))))
(defun guix-geiser-eval-read (str &optional repl)
"Evaluate STR with guile expression using Geiser REPL.
Return elisp expression of the first result value of evaluation."
;; The goal is to convert a string with scheme expression into elisp
;; expression.
(let ((result (car (guix-geiser-eval str repl))))
(cond
((or (string= result "#f")
(string= result "#<unspecified>"))
nil)
((string= result "#t")
t)
(t
(read (replace-regexp-in-string
"[ (]\\(#f\\)" "nil"
(replace-regexp-in-string
"[ (]\\(#t\\)" "t"
result
nil nil 1)
nil nil 1))))))
(defun guix-repl-send (cmd &optional save-history)
"Send CMD input string to the current REPL buffer.
This is the same as `geiser-repl--send', but with SAVE-HISTORY
argument. If SAVE-HISTORY is non-nil, save CMD in the REPL
history."
(when (and cmd (eq major-mode 'geiser-repl-mode))
(geiser-repl--prepare-send)
(goto-char (point-max))
(comint-kill-input)
(insert cmd)
(let ((comint-input-filter (if save-history
comint-input-filter
'ignore)))
(comint-send-input nil t))))
(defun guix-geiser-eval-in-repl (str &optional repl no-history no-display)
"Switch to Geiser REPL and evaluate STR with guile expression there.
If NO-HISTORY is non-nil, do not save STR in the REPL history.
If NO-DISPLAY is non-nil, do not switch to the REPL buffer."
(let ((repl (or repl (guix-geiser-repl))))
(with-current-buffer repl
;; XXX Since Geiser 0.8, `geiser-repl--send' has SAVE-HISTORY
;; argument, so use this function eventually and remove
;; `guix-repl-send'.
(guix-repl-send str (not no-history)))
(unless no-display
(geiser-repl--switch-to-buffer repl))))
(defun guix-geiser-eval-in-repl-synchronously (str &optional repl
no-history no-display)
"Evaluate STR in Geiser REPL synchronously, i.e. wait until the
REPL operation will be finished.
See `guix-geiser-eval-in-repl' for the meaning of arguments."
(let* ((repl (if repl (get-buffer repl) (guix-geiser-repl)))
(running? nil)
(filter (lambda (output)
(setq running?
(and (get-buffer-process repl)
(not (guix-guile-prompt? output))))))
(comint-output-filter-functions
(cons filter comint-output-filter-functions)))
(guix-geiser-eval-in-repl str repl no-history no-display)
(while running?
(sleep-for 0.1))))
(defun guix-geiser-call (proc &rest args)
"Call (PROC ARGS ...) synchronously using the current Geiser REPL.
PROC and ARGS should be strings."
(guix-geiser-eval
(apply #'guix-guile-make-call-expression proc args)))
(defun guix-geiser-call-in-repl (proc &rest args)
"Call (PROC ARGS ...) in the current Geiser REPL.
PROC and ARGS should be strings."
(guix-geiser-eval-in-repl
(apply #'guix-guile-make-call-expression proc args)))
(provide 'guix-geiser)
;;; guix-geiser.el ends here
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