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;;; geiser-inf.el -- inferior scheme processes
;; Copyright (c) 2010 Jose Antonio Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Thu Nov 11, 2010 01:04
(require 'geiser-impl)
(require 'geiser-base)
(require 'cmuscheme)
;; Implementation-dependent parameters
(geiser-impl--define-caller geiser-inf--binary binary ()
"A variable or function returning the path to the scheme binary
for this implementation.")
(geiser-impl--define-caller geiser-inf--arglist arglist ()
"A function taking no arguments and returning a list of
arguments to be used when invoking the scheme binary.")
(geiser-impl--define-caller geiser-inf--prompt-regexp prompt-regexp ()
"A variable (or thunk returning a value) giving the regular
expression for this implementation's scheme prompt.")
(geiser-impl--define-caller geiser-inf--init-server-cmd init-server-cmd ()
"A variable (or thunk returning a value) giving the REPL server
initialization command for local processes. The command must return a
list of the form (server PORT).")
;; Auxiliary functions
(defun geiser-inf--wait-for-prompt (timeout)
(let ((p (point)) (seen) (buffer (current-buffer)))
(while (and (not seen)
(> timeout 0)
(get-buffer-process buffer))
(sleep-for 0.1)
(setq timeout (- timeout 100))
(goto-char p)
(setq seen (re-search-forward comint-prompt-regexp nil t)))
(goto-char (point-max))
(unless seen (error "%s" "No prompt found!"))))
(defun geiser-inf--make-buffer (impl)
(with-current-buffer (generate-new-buffer (format "* inferior %s *" impl))
(inferior-scheme-mode)
(current-buffer)))
;; Starting an inferior REPL
(defun geiser-inf--run-scheme (impl)
(let ((bin (geiser-inf--binary impl))
(args (geiser-inf--arglist impl))
(prompt-rx (geiser-inf--prompt-regexp impl)))
(unless (and bin args prompt-rx)
(error "Sorry, I don't know how to start %s" impl))
(with-current-buffer (geiser-inf--make-buffer impl)
(setq comint-prompt-regexp prompt-rx)
(condition-case err
(apply 'make-comint-in-buffer
`(,(buffer-name) ,(current-buffer) ,bin nil ,@args))
(error (error "Unable to start REPL: %s" (error-message-string err))))
(geiser-inf--wait-for-prompt 10000)
(cons (current-buffer)
(comint-redirect-results-list (geiser-inf--server-init-cmd impl)
"(server-port \\([0-9]\\)+)"
1)))))
(provide 'geiser-inf)
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