[elpa] externals/eglot d90efdf 001/139: Initial commit

[João Távora]

branch: externals/eglot
commit d90efdf04024eab75f189790cd38678a7cad3b43
Author: João Távora <address@hidden>
Commit: João Távora <address@hidden>

    Initial commit
---
 .gitignore |  40 ++++
 LICENSE    | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.md  |  13 ++
 eglot.el   | 393 +++++++++++++++++++++++++++++++++++
 4 files changed, 1120 insertions(+)

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,40 @@
+ChangeLog
+*.x86f
+*.fasl*
+*.dfsl
+*.lx64fsl
+*.dx64fsl
+*.elc
+*.cls
+*~
+\#*\#
+.\#*
+.DS_Store
+# for the doc
+#
+doc/*.html
+doc/html
+doc/contributors.texi
+doc/*.info
+doc/*.pdf
+doc/*.ps
+doc/*.dvi
+doc/*.aux
+doc/*.cp
+doc/*.cps
+doc/*.fn
+doc/*.fns
+doc/*.ky
+doc/*.kys
+doc/*.log
+doc/*.pg
+doc/*.toc
+doc/*.tp
+doc/*.vr
+doc/*.op
+doc/*.ops
+doc/*.pgs
+doc/*.vrs
+doc/*.tgz
+doc/gh-pages
+/dist/
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..9cecc1d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
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+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    {one line to give the program's name and a brief idea of what it does.}
+    Copyright (C) {year}  {name of author}
+
+    This program 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.
+
+    This program 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/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    {project}  Copyright (C) {year}  {fullname}
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7cf96f9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,13 @@
+Eglot
+-----
+
+*E*macs Poly*glot*. An Emacs client to Language Server Protocol servers.
+
+Coming soon.
+
+```
+(add-to-list 'load-path "/path/to/eglot")
+(require 'eglot)
+
+M-x eglot-new-process
+```
diff --git a/eglot.el b/eglot.el
new file mode 100644
index 0000000..f667eca
--- /dev/null
+++ b/eglot.el
@@ -0,0 +1,393 @@
+;;; eglot.el --- A client for Language Server Protocol (LSP) servers  -*- 
lexical-binding: t; -*-
+
+;; Copyright (C) 2017  João Távora
+
+;; Author: João Távora
+;; Keywords: extensions
+
+;; This program 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.
+
+;; This program 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:
+
+;;
+
+;;; Code:
+
+(require 'json)
+(require 'cl-lib)
+(require 'project)
+
+(defgroup eglot nil
+  "Interaction with Language Server Protocol servers"
+  :prefix "eglot-"
+  :group 'applications)
+
+(defvar eglot-executables '((rust-mode . ("rls")))
+  "Alist mapping major modes to server executables")
+
+;;; TODO: Soon to be per-project
+(defvar eglot--processes-by-project (make-hash-table :test #'equal))
+
+(defun eglot--current-process ()
+  "The current logical EGLOT process"
+  (let ((cur (project-current)))
+    (unless cur
+      (eglot--error "No current project, so no process"))
+    (gethash cur eglot--processes-by-project)))
+
+(defmacro eglot--define-process-var (var-sym initval &optional doc)
+  (declare (indent 2))
+  `(progn
+     (put ',var-sym 'function-documentation ,doc)
+     (defun ,var-sym (&optional process)
+       (let* ((proc (or process (eglot--current-process)))
+              (probe (process-get proc ',var-sym)))
+         (or probe
+             (let ((def ,initval))
+               (process-put proc ',var-sym def)
+               def))))
+     (gv-define-setter ,var-sym (to-store &optional process)
+       (let ((prop ',var-sym))
+         `(let ((proc (or ,process (eglot--current-process))))
+            (process-put proc ',prop ,to-store))))))
+
+(eglot--define-process-var eglot--message-mark nil
+  "Point where next unread message starts")
+
+(eglot--define-process-var eglot--expected-bytes nil
+  "How many bytes declared by server")
+
+(eglot--define-process-var eglot--continuations (make-hash-table)
+  "A hash table of request ID to continuation lambdas")
+
+(eglot--define-process-var eglot--events-buffer nil
+  "A buffer pretty-printing the EGLOT RPC events")
+
+(cl-defmacro eglot--request (process
+                              method
+                              params
+                              success-fn
+                              &key
+                              error-fn
+                              timeout-fn
+                              (async-p t))
+  (append `(eglot--call-with-request
+            ,process
+            ,async-p
+            ,method
+            ,params
+            (cl-function ,success-fn))
+          (and error-fn
+               `((cl-function ,error-fn)))
+          (and timeout-fn
+               `((cl-function ,timeout-fn)))))
+
+(defun eglot--command ()
+  (cdr (assoc major-mode eglot-executables)))
+
+(defun eglot-new-process (&optional interactive)
+  "Starts a new EGLOT process and initializes it"
+  (interactive (list t))
+  (let ((project (project-current))
+        (command (eglot--command)))
+    (unless command (eglot--error "Cannot work without an LSP executable"))
+    (unless project (eglot--error "Cannot work without a current project!"))
+    (let ((current-process (eglot--current-process)))
+      (when (and current-process
+                 (process-live-p current-process))
+        (eglot-quit-server current-process 'sync)))
+    (let ((good-name
+           (format "EGLOT server (%s)"
+                   (file-name-base
+                    (directory-file-name
+                     (car (project-roots (project-current))))))))
+      (with-current-buffer (get-buffer-create
+                            (format "*%s inferior*" good-name))
+        (let* ((proc
+                (make-process :name good-name
+                              :buffer (current-buffer)
+                              :command command
+                              :connection-type 'pipe
+                              :filter 'eglot--process-filter
+                              :sentinel 'eglot--process-sentinel
+                              :stderr (get-buffer-create (format "*%s stderr*"
+                                                                 good-name))))
+               (inhibit-read-only t))
+          (puthash (project-current) proc eglot--processes-by-project)
+          (erase-buffer)
+          (let ((marker (point-marker)))
+            (set-marker-insertion-type marker nil)
+            (setf (eglot--message-mark proc) marker))
+          (read-only-mode t)
+          (with-current-buffer (eglot-events-buffer proc)
+            (let ((inhibit-read-only t))
+              (insert
+               (format "\n-----------------------------------\n"))))
+          (eglot--protocol-initialize proc)
+          (when interactive
+            (display-buffer (eglot-events-buffer proc))))))))
+
+(defun eglot-quit-server (process &optional sync)
+  (interactive (list (eglot--current-process)))
+  (eglot--message "Asking server to terminate")
+  (eglot--request
+      process
+      :shutdown
+      nil
+      (lambda (&rest _anything)
+        (eglot--message "Now asking server to exit")
+        (process-put process 'eglot--moribund t)
+        (eglot--process-send process
+                              `(:jsonrpc  "2.0"
+                                          :method  :exit)))
+      :async-p (not sync)
+      :timeout-fn (lambda ()
+                    (eglot--warn "Brutally deleting existing process %s"
+                                  process)
+                    (process-put process 'eglot--moribund t)
+                    (delete-process process))))
+
+(defun eglot--process-sentinel (process change)
+  (with-current-buffer (process-buffer process)
+    (eglot--debug "Process state changed to %s" change)
+    (when (not (process-live-p process))
+      (cond ((process-get process 'eglot--moribund)
+             (eglot--message "Process exited with status %s"
+                              (process-exit-status process)))
+            (t
+             (eglot--warn "Process unexpectedly changed to %s" change))))))
+
+(defun eglot--process-filter (proc string)
+  (when (buffer-live-p (process-buffer proc))
+    (with-current-buffer (process-buffer proc)
+      (let ((moving (= (point) (process-mark proc)))
+            (inhibit-read-only t)
+            (pre-insertion-mark (copy-marker (process-mark proc)))
+            (expected-bytes (eglot--expected-bytes proc))
+            (message-mark (eglot--message-mark proc)))
+        (save-excursion
+          ;; Insert the text, advancing the process marker.
+          (goto-char (process-mark proc))
+          (insert string)
+          (set-marker (process-mark proc) (point)))
+        (if moving (goto-char (process-mark proc)))
+
+        ;; check for new message header
+        ;;
+        (save-excursion
+          (goto-char pre-insertion-mark)
+          (let* ((match (search-forward-regexp
+                         "\\(?:.*: .*\r\n\\)*Content-Length: 
\\([[:digit:]]+\\)\r\n\\(?:.*: .*\r\n\\)*\r\n"
+                         (+ (point) 100)
+                         t))
+                 (new-expected-bytes (and match
+                                          (string-to-number (match-string 
1)))))
+            (when new-expected-bytes
+              (when expected-bytes
+                (eglot--warn
+                 (concat "Unexpectedly starting new message but %s bytes"
+                         "reportedly remaining from previous one")
+                 expected-bytes))
+              (set-marker message-mark (point))
+              (setf (eglot--expected-bytes proc) new-expected-bytes)
+              (setq expected-bytes new-expected-bytes))))
+
+        ;; check for message body
+        ;;
+        (let ((available-bytes (- (position-bytes (process-mark proc))
+                                  (position-bytes message-mark))))
+          (cond ((not expected-bytes)
+                 (eglot--warn
+                  "Skipping %s bytes of unexpected garbage from process %s"
+                  available-bytes
+                  proc)
+                 (set-marker message-mark (process-mark proc)))
+                ((>= available-bytes
+                     expected-bytes)
+                 (let* ((message-end (byte-to-position
+                                      (+ (position-bytes message-mark)
+                                         expected-bytes))))
+                   (save-excursion
+                     (save-restriction
+                       (goto-char message-mark)
+                       (narrow-to-region message-mark
+                                         message-end)
+                                              (eglot--process-receive proc 
(let ((json-object-type 'plist))
+                                                       (json-read)))))
+                   (set-marker message-mark message-end)
+                   (setf (eglot--expected-bytes proc) nil)))
+                (t
+                 ;; just adding some stuff to the end that doesn't yet
+                 ;; complete the message
+                 )))))))
+
+(defun eglot-events-buffer (process &optional interactive)
+  (interactive (list (eglot--current-process) t))
+  (let* ((probe (eglot--events-buffer process))
+         (buffer (or (and (buffer-live-p probe)
+                          probe)
+                     (let ((buffer (get-buffer-create
+                                    (format "*%s events*"
+                                            (process-name process)))))
+                       (with-current-buffer buffer
+                         (buffer-disable-undo)
+                         (read-only-mode t)
+                         (setf (eglot--events-buffer process)
+                               buffer))
+                       buffer))))
+    (when interactive
+      (pop-to-buffer buffer))
+    buffer))
+
+(defun eglot--log-event (proc type message)
+  (with-current-buffer (eglot-events-buffer proc)
+    (let ((inhibit-read-only t))
+      (goto-char (point-max))
+      (insert (format "%s: \n%s\n" type (pp-to-string message))))))
+
+(defun eglot--process-receive (proc message)
+  (let ((inhibit-read-only t))
+    (insert (format "Server said:\n%s\n" message)))
+  (eglot--log-event proc 'server message)
+  ;; Maybe this is a responsee
+  ;;
+  (let* ((response-id (plist-get message :id))
+         (err (plist-get message :error))
+         (continuations (and response-id
+                             (gethash response-id (eglot--continuations)))))
+    (cond ((and response-id
+                (not continuations))
+           (eglot--warn "Ooops no continuation for id %s" response-id))
+          (continuations
+           (cancel-timer (third continuations))
+           (cond (err
+                  (apply (second continuations) err))
+                 (t
+                  (apply (first continuations) (plist-get message :result)))))
+          (t
+           (eglot--debug "No implemetation for notification %s yet"
+                         (plist-get message :method))))))
+
+;; (setq json-encoding-pretty-print nil) ; for debug
+(defvar eglot--expect-carriage-return nil)
+
+(defun eglot--process-send (proc message)
+  (let* ((json (json-encode message))
+         (to-send (format "Content-Length: %d\r\n\r\n%s"
+                          (string-bytes json)
+                          json)))
+    (process-send-string proc to-send)
+    (eglot--log-event proc 'client message)))
+
+(defvar eglot--next-request-id 0)
+
+(defun eglot--next-request-id ()
+  (setq eglot--next-request-id (1+ eglot--next-request-id)))
+
+(defun eglot--call-with-request (process
+                                  async-p
+                                  method
+                                  params
+                                  success-fn
+                                  &optional error-fn timeout-fn)
+  (let* ((id (eglot--next-request-id))
+         (timeout-fn (or timeout-fn
+                         (lambda ()
+                           (eglot--warn "Tired of waiting for reply to %s" id)
+                           (remhash id (eglot--continuations process)))))
+         (error-fn (or error-fn
+                       (cl-function
+                        (lambda (&key code message)
+                          (eglot--warn "Request id=%s errored with code=%s: %s"
+                                        id code message)))))
+         (catch-tag (cl-gensym (format "eglot--tag-%d-" id))))
+    (eglot--process-send process
+                          `(:jsonrpc  "2.0"
+                                      :id  ,id
+                                      :method  ,method
+                                      :params  ,params))
+    (catch catch-tag
+      (puthash id
+               (list (if async-p
+                         success-fn
+                       (lambda (&rest args)
+                         (throw catch-tag (apply success-fn args))))
+                     (if async-p
+                         error-fn
+                       (lambda (&rest args)
+                         (throw catch-tag (apply error-fn args))))
+                     (run-with-timer 5 nil
+                                     (if async-p
+                                         timeout-fn
+                                       (lambda ()
+                                         (throw catch-tag (apply 
timeout-fn))))))
+               (eglot--continuations process))
+      (unless async-p
+        (while t
+          (unless (eq (process-status process) 'open)
+            (eglot--error "Process %s died unexpectedly" process))
+          (accept-process-output nil 0.01))))))
+
+
+(defun eglot--protocol-initialize (process)
+  (eglot--request
+    process
+    :initialize
+    `(:processId  ,(emacs-pid)
+                  :rootPath  ,(concat "" ;; FIXME RLS doesn't like "file://"
+                                      (expand-file-name (car (project-roots
+                                                              
(project-current)))))
+                  :initializationOptions  []
+                  :capabilities (:workspace (:executeCommand 
(:dynamicRegistration t))
+                                            :textDocument (:synchronization 
(:didSave t)))
+                  )
+    (lambda (&key capabilities)
+      (cl-destructuring-bind
+          (&rest all
+                 &key
+                 _textDocumentSync
+                 _hoverProvider
+                 _completionProvider
+                 _definitionProvider
+                 _referencesProvider
+                 _documentHighlightProvider
+                 _documentSymbolProvider
+                 _workspaceSymbolProvider
+                 _codeActionProvider
+                 _documentFormattingProvider
+                 _documentRangeFormattingProvider
+                 _renameProvider
+                 _executeCommandProvider
+                 )
+          capabilities
+        (message "so yeah I got lots (%d) of capabilities" (length all))))))
+
+(defun eglot--debug (format &rest args)
+  (display-warning 'eglot
+     (apply #'format format args)
+     :debug))
+
+(defun eglot--error (format &rest args)
+  (error (apply #'format format args)))
+
+(defun eglot--message (format &rest args)
+  (message (concat "[eglot] " (apply #'format format args))))
+
+(defun eglot--warn (format &rest args)
+  (display-warning 'eglot
+     (apply #'format format args)
+     :warning))
+
+(provide 'eglot)
+;;; eglot.el ends here