1 ;;; fuel-connection.el -- asynchronous comms with the fuel listener
3 ;; Copyright (C) 2008 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 (make-variable-buffer-local
27 (defvar fuel-con--connection nil))
29 (defun fuel-con--get-connection (buffer/proc)
30 (if (processp buffer/proc)
31 (fuel-con--get-connection (process-buffer buffer/proc))
32 (with-current-buffer buffer/proc
33 (or fuel-con--connection
34 (setq fuel-con--connection
35 (fuel-con--setup-connection buffer/proc))))))
38 ;;; Request and connection datatypes:
40 (defun fuel-con--connection-queue-request (c r)
41 (let ((reqs (assoc :requests c)))
42 (setcdr reqs (append (cdr reqs) (list r)))))
44 (defun fuel-con--make-request (str cont &optional sender-buffer)
45 (list :fuel-connection-request
48 (cons :continuation cont)
49 (cons :buffer (or sender-buffer (current-buffer)))))
51 (defsubst fuel-con--request-p (req)
52 (and (listp req) (eq (car req) :fuel-connection-request)))
54 (defsubst fuel-con--request-id (req)
55 (cdr (assoc :id req)))
57 (defsubst fuel-con--request-string (req)
58 (cdr (assoc :string req)))
60 (defsubst fuel-con--request-continuation (req)
61 (cdr (assoc :continuation req)))
63 (defsubst fuel-con--request-buffer (req)
64 (cdr (assoc :buffer req)))
66 (defsubst fuel-con--request-deactivate (req)
67 (setcdr (assoc :continuation req) nil))
69 (defsubst fuel-con--request-deactivated-p (req)
70 (null (cdr (assoc :continuation req))))
72 (defsubst fuel-con--make-connection (buffer)
73 (list :fuel-connection
74 (cons :requests (list))
76 (cons :completed (make-hash-table :weakness 'value))
80 (defsubst fuel-con--connection-p (c)
81 (and (listp c) (eq (car c) :fuel-connection)))
83 (defsubst fuel-con--connection-requests (c)
84 (cdr (assoc :requests c)))
86 (defsubst fuel-con--connection-current-request (c)
87 (cdr (assoc :current c)))
89 (defun fuel-con--connection-clean-current-request (c)
90 (let* ((cell (assoc :current c))
93 (puthash (fuel-con--request-id req) req (cdr (assoc :completed c)))
96 (defsubst fuel-con--connection-completed-p (c id)
97 (gethash id (cdr (assoc :completed c))))
99 (defsubst fuel-con--connection-buffer (c)
100 (cdr (assoc :buffer c)))
102 (defun fuel-con--connection-pop-request (c)
103 (let ((reqs (assoc :requests c))
104 (current (assoc :current c)))
105 (setcdr current (prog1 (cadr reqs) (setcdr reqs (cddr reqs))))
106 (if (and (cdr current)
107 (fuel-con--request-deactivated-p (cdr current)))
108 (fuel-con--connection-pop-request c)
111 (defun fuel-con--connection-start-timer (c)
112 (let ((cell (assoc :timer c)))
113 (when (cdr cell) (cancel-timer (cdr cell)))
114 (setcdr cell (run-at-time t 0.5 'fuel-con--process-next c))))
116 (defun fuel-con--connection-cancel-timer (c)
117 (let ((cell (assoc :timer c)))
118 (when (cdr cell) (cancel-timer (cdr cell)))))
121 ;;; Connection setup:
123 (defun fuel-con--cleanup-connection (c)
124 (fuel-con--connection-cancel-timer c))
126 (defun fuel-con--setup-connection (buffer)
128 (fuel-con--cleanup-connection fuel-con--connection)
129 (let ((conn (fuel-con--make-connection buffer)))
130 (fuel-con--setup-comint)
132 (setq fuel-con--connection conn)
133 (fuel-con--connection-start-timer conn))))
135 (defconst fuel-con--prompt-regex "( .+ ) ")
136 (defconst fuel-con--eot-marker "<~FUEL~>")
137 (defconst fuel-con--init-stanza "USE: fuel f fuel-eval")
139 (defconst fuel-con--comint-finished-regex
140 (format "^%s$" fuel-con--eot-marker))
142 (defun fuel-con--setup-comint ()
143 (set (make-local-variable 'comint-redirect-insert-matching-regexp) t)
144 (add-hook 'comint-redirect-filter-functions
145 'fuel-con--comint-preoutput-filter nil t)
146 (add-hook 'comint-redirect-hook
147 'fuel-con--comint-redirect-hook nil t))
149 (defadvice comint-redirect-setup (after fuel-con--advice activate)
150 (setq comint-redirect-finished-regexp fuel-con--comint-finished-regex))
152 (defun fuel-con--comint-preoutput-filter (str)
153 (when (string-match fuel-con--comint-finished-regex str)
154 (setq comint-redirect-finished-regexp fuel-con--prompt-regex))
158 ;;; Requests handling:
160 (defsubst fuel-con--comint-buffer ()
161 (get-buffer-create " *fuel connection retort*"))
163 (defsubst fuel-con--comint-buffer-form ()
164 (with-current-buffer (fuel-con--comint-buffer)
165 (goto-char (point-min))
167 (read (current-buffer))
168 (error (list 'fuel-con-error (buffer-string))))))
170 (defun fuel-con--process-next (con)
171 (when (not (fuel-con--connection-current-request con))
172 (let* ((buffer (fuel-con--connection-buffer con))
173 (req (fuel-con--connection-pop-request con))
174 (str (and req (fuel-con--request-string req)))
175 (cbuf (with-current-buffer (fuel-con--comint-buffer)
178 (if (not (buffer-live-p buffer))
179 (fuel-con--connection-cancel-timer con)
180 (when (and buffer req str)
182 (fuel-log--info "<%s>: %s" (fuel-con--request-id req) str)
183 (comint-redirect-send-command (format "%s" str) cbuf nil t))))))
185 (defun fuel-con--process-completed-request (req)
186 (let ((cont (fuel-con--request-continuation req))
187 (id (fuel-con--request-id req))
188 (rstr (fuel-con--request-string req))
189 (buffer (fuel-con--request-buffer req)))
191 (fuel-log--warn "<%s> Droping result for request %S (%s)"
194 (with-current-buffer (or buffer (current-buffer))
195 (funcall cont (fuel-con--comint-buffer-form))
196 (fuel-log--info "<%s>: processed\n\t%s" id req))
197 (error (fuel-log--error
198 "<%s>: continuation failed %S \n\t%s" id rstr cerr))))))
200 (defun fuel-con--comint-redirect-hook ()
201 (if (not fuel-con--connection)
202 (fuel-log--error "No connection in buffer")
203 (let ((req (fuel-con--connection-current-request fuel-con--connection)))
204 (if (not req) (fuel-log--error "No current request")
205 (fuel-con--process-completed-request req)
206 (fuel-con--connection-clean-current-request fuel-con--connection)))))
209 ;;; Message sending interface:
211 (defun fuel-con--send-string (buffer/proc str cont &optional sender-buffer)
213 (let ((con (fuel-con--get-connection buffer/proc)))
215 (error "FUEL: couldn't find connection"))
216 (let ((req (fuel-con--make-request str cont sender-buffer)))
217 (fuel-con--connection-queue-request con req)
218 (fuel-con--process-next con)
221 (defvar fuel-connection-timeout 30000
222 "Time limit, in msecs, blocking on synchronous evaluation requests")
224 (defun fuel-con--send-string/wait (buffer/proc str cont &optional timeout sbuf)
226 (let* ((con (fuel-con--get-connection buffer/proc))
227 (req (fuel-con--send-string buffer/proc str cont sbuf))
228 (id (and req (fuel-con--request-id req)))
229 (time (or timeout fuel-connection-timeout))
231 (waitsecs (/ step 1000.0)))
234 (while (and (> time 0)
235 (not (fuel-con--connection-completed-p con id)))
236 (accept-process-output nil waitsecs)
237 (setq time (- time step)))
238 (error (setq time 1)))
240 (fuel-con--request-deactivate req)
244 (provide 'fuel-connection)
245 ;;; fuel-connection.el ends here