lean2/src/emacs/lean-server.el

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;; Copyright (c) 2014 Microsoft Corporation. All rights reserved.
;; Released under Apache 2.0 license as described in the file LICENSE.
;;
;; Author: Soonho Kong
;;
(require 'cl-lib)
(require 'lean-variable)
(require 'lean-cmd)
(require 'lean-info)
(require 'lean-util)
(require 'flycheck)
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;; Parameters
;; ==========
(defvar-local lean-server-process-name "lean-server")
(defvar-local lean-server-buffer-name "*lean-server*")
(defvar-local lean-server-option "--server")
;; Log Function
;; ============
(defun lean-server-log (format-string &rest args)
"Display a message at the bottom of the *lean-server* buffer."
(with-current-buffer (lean-server-get-buffer)
(goto-char (point-max))
(insert (apply 'format (concat format-string "\n") args))))
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;; How to read data from an async process
;; ======================================
(defconst lean-server-syntax-pattern
`((INFO ,(rx line-start "-- BEGININFO" line-end)
,(rx line-start (group "-- ENDINFO") line-end))
(SET ,(rx line-start "-- BEGINSET" line-end)
,(rx line-start (group "-- ENDSET") line-end))
(EVAL ,(rx line-start "-- BEGINEVAL" line-end)
,(rx line-start (group "-- ENDEVAL") line-end))
(ERROR ,(rx line-start "-- " (0+ not-newline) line-end)
,(rx line-start (group "-- ERROR" (0+ not-newline)) line-end)))
"Regular expression pattern for lean-server message syntax")
(defun lean-server-split-buffer (buf-str beg-regex end-regex)
""
(let ((beg (string-match beg-regex buf-str))
(end (string-match end-regex buf-str))
pre body post)
(when (and beg end)
(setq end (match-end 1))
(setq pre (substring-no-properties buf-str 0 beg))
(setq body (substring-no-properties buf-str beg end))
(setq post (substring-no-properties buf-str end))
`(,pre ,body ,post))))
(defun lean-server-check-buffer-and-partition (buf-str)
"Return the status of buffer."
(let (result)
(cl-loop for (type beg-regex end-regex) in lean-server-syntax-pattern
do (setq partition-result (lean-server-split-buffer buf-str beg-regex end-regex))
if partition-result
return `(,type ,partition-result))))
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(defun lean-server-process-received-message (buf str)
"Process received message from lean-server"
(lean-server-log "Received String: %s" str)
;; Append to buffer
(setq lean-global-server-buffer (concat lean-global-server-buffer str))
(let ((partition-result (lean-server-check-buffer-and-partition lean-global-server-buffer)))
(pcase partition-result
(`(,type (,pre ,body ,post))
(lean-server-log "PRE: %s" pre)
(lean-server-log "BODY: %s" body)
(lean-server-log "POST: %s" post)
(setq lean-global-server-message-to-process `(,type ,pre ,body))
(setq lean-global-server-buffer post)))))
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(defun lean-server-output-filter (process string)
"Filter function attached to lean-server process"
(lean-server-process-received-message (process-buffer process) string))
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(defun lean-server-handle-signal (process event)
"Handle signals for lean-server-process"
(cond
((string-prefix-p "hangup" event)
(lean-server-initialize-global-vars))))
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;; How to create an async process
;; ==============================
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(defun lean-server-initialize-global-vars ()
"Initialize lean-server related global variables"
(setq lean-global-server-buffer nil)
(setq lean-global-server-current-file-name nil)
(setq lean-global-server-message-to-process nil)
(when (timerp lean-global-nay-retry-timer)
(cancel-timer lean-global-nay-retry-timer))
(setq lean-global-nay-retry-timer nil))
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(defun lean-server-create-process ()
"Create lean-server process."
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;; (when (buffer-modified-p)
;; (error "Please save the buffer before start lean-server."))
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(let ((process-connection-type nil)
(lean-server-process
(start-process lean-server-process-name
lean-server-buffer-name
(lean-get-executable lean-executable-name)
lean-server-option)))
(set-process-coding-system lean-server-process 'utf-8 'utf-8)
(set-process-filter lean-server-process 'lean-server-output-filter)
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(set-process-sentinel lean-server-process 'lean-server-handle-signal)
(lean-server-initialize-global-vars)
(setq lean-global-server-process lean-server-process)
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lean-server-process))
(defun lean-server-kill-process ()
"Kill lean-server process. Return t if killed, nil if nothing to kill"
(interactive)
(cond
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((and lean-global-server-process
(not (= 0 (process-exit-status lean-global-server-process))))
(setq lean-global-server-process nil)
t)
(lean-global-server-process
(when (interactive-p)
(message "lean-server-kill-process: %S killed" lean-global-server-process))
(kill-process lean-global-server-process)
(setq lean-global-server-process nil)
t)
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(t
(when (interactive-p)
(message "lean-server-kill-process: no process to kill"))
nil)))
(defun lean-server-restart-process ()
"Restart lean-server process."
(interactive)
(and (lean-server-kill-process)
(lean-server-create-process)))
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(defun lean-server-get-process ()
"Get lean-server process. If needed, create a one."
(cond ((not lean-global-server-process)
(lean-server-create-process))
((not (process-live-p lean-global-server-process))
(when (interactive-p)
(message "lean-server-get-process: %S is not live, kill it"
lean-global-server-process))
(lean-server-restart-process))
(t lean-global-server-process)))
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(defun lean-server-get-buffer ()
"Get lean-server buffer."
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(process-buffer (lean-server-get-process)))
;; How to send data to an async process
;; ====================================
(defun lean-flush-changed-lines ()
"Flush lean-changed-lines.
Send REPLACE commands to lean-server, reset lean-changed-lines to nil."
(cl-loop for n in lean-changed-lines
do (lean-server-send-cmd (lean-cmd-replace n (lean-grab-line n)))
finally (setq lean-changed-lines nil)))
(defun lean-server-check-current-file (&optional file-name)
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"Check lean-global-server-current-file-name.
If it's not the same with file-name (default: buffer-file-name), send VISIT cmd."
(let ((current-file-name (or file-name (buffer-file-name))))
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(unless (string= lean-global-server-current-file-name
current-file-name)
(lean-server-send-cmd (lean-cmd-visit current-file-name)))))
(defun lean-server-before-send-cmd (cmd)
"Operations to perform before sending a command."
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(cl-case (lean-cmd-type cmd)
('LOAD (setq lean-global-server-current-file-name
(lean-cmd-load-get-file-name cmd)))
('VISIT (setq lean-global-server-current-file-name
(lean-cmd-visit-get-file-name cmd)))
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('REPLACE (lean-server-check-current-file))
('INSERT (lean-server-check-current-file))
('REMOVE (lean-server-check-current-file))
('INFO (lean-flush-changed-lines))
('CHECK )
('SET ())
('EVAL (lean-server-check-current-file))))
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(defun lean-server-after-send-cmd (cmd)
"Operations to perform after sending a command."
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(cl-case (lean-cmd-type cmd)
('LOAD ())
('VISIT ())
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('REPLACE ())
('INSERT ())
('REMOVE ())
('INFO ())
('CHECK ())
('SET ())
('EVAL ())))
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(defun lean-server-send-cmd (cmd)
"Send string to lean-server."
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(let ((proc (lean-server-get-process))
(string-to-send (concat (lean-cmd-to-string cmd) "\n")))
(lean-server-before-send-cmd cmd)
;; Logging
(lean-server-log
(concat "Send" "\n"
"================" "\n"
"%s\n"
"================" "\n")
string-to-send)
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(process-send-string proc string-to-send))
(lean-server-after-send-cmd cmd))
(provide 'lean-server)