1 ;;; fuel-connection.el -- asynchronous comms with the fuel listener
3 ;; Copyright (C) 2008, 2009 Jose Antonio Ortega Ruiz
4 ;; See http://factorcode.org/license.txt for BSD license.
6 ;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
7 ;; Keywords: languages, fuel, factor
8 ;; Start date: Thu Dec 11, 2008 03:10
12 ;; Handling communications via a comint buffer running a factor
24 ;;; Default connection:
26 (defvar-local fuel-con--connection nil)
28 (defun fuel-con--get-connection (buffer/proc)
29 (if (processp buffer/proc)
30 (fuel-con--get-connection (process-buffer buffer/proc))
31 (with-current-buffer buffer/proc fuel-con--connection)))
34 ;;; Request and connection datatypes:
36 ;;; TODO Replace with a defstruct
37 (defun fuel-con--connection-queue-request (c r)
38 (let ((reqs (assoc :requests c)))
39 (setcdr reqs (append (cdr reqs) (list r)))))
41 (defun fuel-con--make-request (str cont &optional sender-buffer)
42 (list :fuel-connection-request
43 (cons :id (+ 10000 (random 89999)))
45 (cons :continuation cont)
46 (cons :buffer (or sender-buffer (current-buffer)))))
48 (defsubst fuel-con--request-p (req)
49 (and (listp req) (eq (car req) :fuel-connection-request)))
51 (defsubst fuel-con--request-id (req)
52 (cdr (assoc :id req)))
54 (defsubst fuel-con--request-string (req)
55 (cdr (assoc :string req)))
57 (defsubst fuel-con--request-continuation (req)
58 (cdr (assoc :continuation req)))
60 (defsubst fuel-con--request-buffer (req)
61 (cdr (assoc :buffer req)))
63 (defsubst fuel-con--request-deactivate (req)
64 (setcdr (assoc :continuation req) nil))
66 (defsubst fuel-con--request-deactivated-p (req)
67 (null (cdr (assoc :continuation req))))
69 ;;; TODO Replace with a defstruct
70 (defsubst fuel-con--make-connection (buffer)
71 (list :fuel-connection
72 (cons :requests (list))
74 (cons :completed (make-hash-table :weakness 'value))
78 (defsubst fuel-con--connection-p (c)
79 (and (listp c) (eq (car c) :fuel-connection)))
81 (defsubst fuel-con--connection-requests (c)
82 (cdr (assoc :requests c)))
84 (defsubst fuel-con--connection-current-request (c)
85 (cdr (assoc :current c)))
87 (defun fuel-con--connection-clean-current-request (c)
88 (let* ((cell (assoc :current c))
91 (puthash (fuel-con--request-id req) req (cdr (assoc :completed c)))
94 (defsubst fuel-con--connection-completed-p (c id)
95 (gethash id (cdr (assoc :completed c))))
97 (defsubst fuel-con--connection-buffer (c)
98 (cdr (assoc :buffer c)))
100 (defun fuel-con--connection-pop-request (c)
101 (let ((reqs (assoc :requests c))
102 (current (assoc :current c)))
103 (setcdr current (prog1 (cadr reqs) (setcdr reqs (cddr reqs))))
104 (if (and (cdr current)
105 (fuel-con--request-deactivated-p (cdr current)))
106 (fuel-con--connection-pop-request c)
109 (defun fuel-con--connection-start-timer (c)
110 (let ((cell (assoc :timer c)))
111 (when (cdr cell) (cancel-timer (cdr cell)))
112 (setcdr cell (run-at-time t 0.5 'fuel-con--process-next c))))
114 (defun fuel-con--connection-cancel-timer (c)
115 (let ((cell (assoc :timer c)))
116 (when (cdr cell) (cancel-timer (cdr cell)))))
119 ;;; Connection setup:
121 (defun fuel-con--cleanup-connection (c)
122 (fuel-con--connection-cancel-timer c))
124 (defun fuel-con--setup-connection (buffer)
126 (fuel-con--cleanup-connection fuel-con--connection)
127 (setq fuel-con--connection nil)
128 (let ((conn (fuel-con--make-connection buffer)))
129 (fuel-con--setup-comint)
130 (fuel-con--establish-connection conn buffer)))
132 (defconst fuel-con--prompt-regex "^IN: [^ ]+\\( auto-use\\)? ")
133 (defconst fuel-con--eot-marker "<~FUEL~>")
134 (defconst fuel-con--init-stanza "USE: fuel fuel-retort")
136 (defconst fuel-con--comint-finished-regex-connected
137 (format "^%s$" fuel-con--eot-marker))
139 (defvar fuel-con--comint-finished-regex fuel-con--prompt-regex)
141 (defun fuel-con--setup-comint ()
142 (setq-local comint-redirect-insert-matching-regexp t)
143 (add-hook 'comint-redirect-filter-functions
144 'fuel-con--comint-preoutput-filter nil t)
145 (add-hook 'comint-redirect-hook
146 'fuel-con--comint-redirect-hook nil t))
148 (defadvice comint-redirect-setup
149 (after fuel-con--advice (output-buffer comint-buffer finished-regexp &optional echo))
150 (with-current-buffer comint-buffer
151 (when fuel-con--connection
152 (setq comint-redirect-finished-regexp fuel-con--comint-finished-regex))))
153 (ad-activate 'comint-redirect-setup)
155 (defun fuel-con--comint-preoutput-filter (str)
156 (when (string-match fuel-con--comint-finished-regex str)
157 (setq comint-redirect-finished-regexp fuel-con--prompt-regex))
160 (defun fuel-con--establish-connection (conn buffer)
161 (with-current-buffer (fuel-con--comint-buffer) (erase-buffer))
162 (with-current-buffer buffer
163 (setq fuel-con--connection conn)
164 (setq fuel-con--comint-finished-regex fuel-con--prompt-regex)
165 (fuel-con--send-string/wait buffer
166 fuel-con--init-stanza
167 'fuel-con--establish-connection-cont
171 (defun fuel-con--establish-connection-cont (ignore)
172 (let ((str (with-current-buffer (fuel-con--comint-buffer) (buffer-string))))
173 (if (string-match fuel-con--eot-marker str)
175 (setq fuel-con--comint-finished-regex
176 fuel-con--comint-finished-regex-connected)
177 (fuel-con--connection-start-timer fuel-con--connection)
178 (message "FUEL listener up and running!"))
179 (fuel-con--connection-clean-current-request fuel-con--connection)
180 (setq fuel-con--connection nil)
181 (message "An error occurred initialising FUEL's Factor library!")
182 (pop-to-buffer (fuel-con--comint-buffer)))))
185 ;;; Requests handling:
187 (defsubst fuel-con--comint-buffer ()
188 (get-buffer-create " *fuel connection retort*"))
190 (defun fuel-con--comint-buffer-form ()
191 "Parse the text in the comint buffer into a
192 sexp. fuel-con-error is thrown if the sexp is malformed."
193 (with-current-buffer (fuel-con--comint-buffer)
194 (goto-char (point-min))
196 (let ((form (read (current-buffer))))
197 (if (listp form) form
198 (list 'fuel-con-error (buffer-string))))
199 (error (list 'fuel-con-error (format "%s" cerr))))))
201 (defun fuel-con--process-next (con)
202 (when (not (fuel-con--connection-current-request con))
203 (let* ((buffer (fuel-con--connection-buffer con))
204 (req (fuel-con--connection-pop-request con))
205 (str (and req (fuel-con--request-string req)))
206 (cbuf (with-current-buffer (fuel-con--comint-buffer)
209 (if (not (buffer-live-p buffer))
210 (fuel-con--connection-cancel-timer con)
211 (when (and buffer req str)
213 (fuel-log--info "<%s>: %s" (fuel-con--request-id req) str)
214 (comint-redirect-send-command (format "%s" str) cbuf nil t))))))
216 (defun fuel-con--process-completed-request (req)
217 (let ((cont (fuel-con--request-continuation req))
218 (id (fuel-con--request-id req))
219 (rstr (fuel-con--request-string req))
220 (buffer (fuel-con--request-buffer req)))
222 (fuel-log--warn "<%s> Droping result for request %S (%s)"
225 (with-current-buffer (or buffer (current-buffer))
226 (funcall cont (fuel-con--comint-buffer-form))
227 (fuel-log--info "<%s>: processed" id))
228 (error (fuel-log--error
229 "<%s>: continuation failed %S \n\t%s" id rstr cerr))))))
231 (defun fuel-con--comint-redirect-hook ()
232 (if (not fuel-con--connection)
233 (fuel-log--error "No connection in buffer")
234 (let ((req (fuel-con--connection-current-request fuel-con--connection)))
235 (if (not req) (fuel-log--error "No current request")
236 (fuel-con--process-completed-request req)
237 (fuel-con--connection-clean-current-request fuel-con--connection)))))
240 ;;; Message sending interface:
242 (defconst fuel-con--error-message "FUEL connection not active")
244 (defun fuel-con--send-string (buffer/proc str cont &optional sender-buffer)
246 (let ((con (fuel-con--get-connection buffer/proc)))
247 (unless con (error fuel-con--error-message))
248 (let ((req (fuel-con--make-request str cont sender-buffer)))
249 (fuel-con--connection-queue-request con req)
250 (fuel-con--process-next con)
253 (defvar fuel-connection-timeout 30000
254 "Time limit, in msecs, blocking on synchronous evaluation requests")
256 (defun fuel-con--send-string/wait (buffer/proc str cont &optional timeout sbuf)
258 (let ((con (fuel-con--get-connection buffer/proc)))
259 (unless con (error fuel-con--error-message))
260 (let* ((req (fuel-con--send-string buffer/proc str cont sbuf))
261 (id (and req (fuel-con--request-id req)))
262 (time (or timeout fuel-connection-timeout))
264 (waitsecs (/ step 1000.0)))
267 (while (and (> time 0)
268 (not (fuel-con--connection-completed-p con id)))
269 (accept-process-output nil waitsecs)
270 (setq time (- time step)))
271 (error (setq time 0)))
273 (fuel-con--request-deactivate req)
277 (provide 'fuel-connection)
279 ;;; fuel-connection.el ends here