2023-06-10 13:52:12 -04:00
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;;; gudap.el --- Debug Adapter Protocol client for Emacs -*- lexical-binding: t -*-
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;; Author: Dominik Martinez <dominikmartinez@pm.me>
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;; URL:
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;; Version: 0.1.0
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;; Package-Requires:
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;; Keywords: languages, debug, dap
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2023-06-10 13:55:15 -04:00
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or (at
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;; your option) any later version.
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;; This program is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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2023-06-10 13:52:12 -04:00
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;;; Commentary:
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;; gudap.el is a Debug Adapter Protocol client for Emacs.
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;;
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;; To use, add the following to your init file:
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;;
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;; (require 'gudap)
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;;
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;; Code ~heavily~ adapted from Eglot.
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;;; Code:
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(require 'eglot)
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(require 'jsonrpc)
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(defgroup gudap nil
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"Interaction with Debug Adapter Protocol servers."
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:prefix "gudap-"
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:group 'applications)
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(defclass gudap-connection ()
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((name
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:initarg :name)
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(-process
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:initarg :process
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:accessor gudap--process)
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(-expected-bytes
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:accessor gudap--expected-bytes)
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(-sent-requests
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:initform (make-hash-table)
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:accessor gudap--sent-requests) ;; seq to request command
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(next-seq
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:initform 0
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:accessor gudap--next-seq)))
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(defun gudap--test ()
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(let* ((dap-process (make-process :name "lldb-vscode"
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:buffer (generate-new-buffer "lldb-vscode")
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:command '("lldb-vscode")
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:connection-type 'pipe
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:filter 'gudap--process-filter
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:coding 'utf-8-emacs-unix))
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(conn (make-instance gudap-connection
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:name "lldb-vscode-conn"
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:process dap-process)))
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(process-put dap-process 'gudap-connection conn)
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(setq gudap--current-connection conn)
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(gudap-send-request conn 'initialize nil)))
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(defun gudap--cleanup ()
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(kill-process ((gudap--process gudap--current-connection)))
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(setq gudap--current-connection nil))
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(cl-defgeneric gudap-send-request (server command arguments))
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(cl-defmethod gudap-send-request (server (command (eql initialize)) arguments)
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(puthash (gudap--next-seq server) 'initialize (gudap--sent-requests server))
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(gudap--connection-send
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server
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(list :type "request"
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:command "initialize"
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:arguments (gudap--initialize-arguments))))
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(cl-defgeneric gudap-handle-response (server type body))
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(cl-defmethod gudap-handle-response (server type body)
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(gudap--message "%s" body))
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(cl-defmethod gudap-handle-response (server (type (eql initialize)) body)
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(gudap--message "initialized: %s" body))
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(cl-defgeneric gudap-handle-event (server event body))
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(cl-defmethod gudap-handle-event (server event body)
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(gudap--message "%s" message))
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(cl-defgeneric gudap-handle-request (server command arguments))
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(defun gudap--initialize-arguments ()
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(list :clientId "gudap"
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:clientName "gudap"
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:adapterId "gudap"
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:locale "en-US"
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:linesStartAt1 t
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:columnsStartAt1 t
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:pathFormat "path"
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:supportsVariableType nil
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:supportsVariablePaging nil
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:supportsRunInTerminalRequest nil
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:supportsMemoryReferences nil
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:supportsProgressReporting nil
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:supportsInvalidatedEvent nil
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:supportsMemoryEvent nil
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:supportsArgsCanBeInterpretedByShell nil
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:supportsStartDebuggingRequest nil))
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;; Utils
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(defun gudap--message (format &rest args)
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"Message out with FORMAT with ARGS."
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(message "[gudap] %s" (apply #'format format args)))
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;; JSONRPC-ish handling
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(defvar gudap--in-process-filter nil
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"Non-nil if inside `dap--process-filter'.")
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(cl-defun gudap--process-filter (proc string)
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"Called when new data STRING has arrived for PROC."
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(when gudap--in-process-filter
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;; Problematic recursive process filters may happen if
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;; `dap--connection-receive', called by us, eventually calls
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;; client code which calls `process-send-string' (which see) to,
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;; say send a follow-up message. If that happens to writes enough
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;; bytes for pending output to be received, we will lose JSONRPC
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;; messages. In that case, remove recursiveness by re-scheduling
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;; ourselves to run from within a timer as soon as possible
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;; (bug#60088)
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(run-at-time 0 nil #'gudap--process-filter proc string)
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(cl-return-from gudap--process-filter))
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(when (buffer-live-p (process-buffer proc))
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(with-current-buffer (process-buffer proc)
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(let* ((gudap--in-process-filter t)
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(connection (process-get proc 'gudap-connection))
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(expected-bytes (gudap--expected-bytes connection)))
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;; Insert the text, advancing the process marker.
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;;
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(save-excursion
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(goto-char (process-mark proc))
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(let ((inhibit-read-only t)) (insert string))
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(set-marker (process-mark proc) (point)))
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;; Loop (more than one message might have arrived)
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;;
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(unwind-protect
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(let (done)
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(while (not done)
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(cond
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((not expected-bytes)
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;; Starting a new message
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;;
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(setq expected-bytes
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(and (search-forward-regexp
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"\\(?:.*: .*\r\n\\)*Content-Length: \
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*\\([[:digit:]]+\\)\r\n\\(?:.*: .*\r\n\\)*\r\n"
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(+ (point) 200)
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t)
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(string-to-number (match-string 1))))
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(unless expected-bytes
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(setq done :waiting-for-new-message)))
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(t
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;; Attempt to complete a message body
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;;
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(let ((available-bytes (- (position-bytes (process-mark proc))
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(position-bytes (point)))))
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(cond
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((>= available-bytes
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expected-bytes)
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(let* ((message-end (byte-to-position
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(+ (position-bytes (point))
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expected-bytes))))
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(unwind-protect
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(save-restriction
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(narrow-to-region (point) message-end)
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(let* ((json-message
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(condition-case-unless-debug oops
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(jsonrpc--json-read)
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(error
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(jsonrpc--warn "Invalid JSON: %s %s"
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(cdr oops) (buffer-string))
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nil))))
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(when json-message
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;; Process content in another
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;; buffer, shielding proc buffer from
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;; tamper
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(with-temp-buffer
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(gudap--connection-receive connection
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json-message)))))
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(goto-char message-end)
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(let ((inhibit-read-only t))
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(delete-region (point-min) (point)))
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(setq expected-bytes nil))))
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(t
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;; Message is still incomplete
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;;
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(setq done :waiting-for-more-bytes-in-this-message))))))))
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;; Saved parsing state for next visit to this filter
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;;
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(setf (gudap--expected-bytes connection) expected-bytes))))))
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(defun gudap--connection-receive (conn message)
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(cl-destructuring-bind (&key seq type event body arguments &allow-other-keys) message
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(cond
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(;; event
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(string-equal type "event")
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(gudap-handle-event conn (intern event) body))
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(;; response
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(string-equal type "response")
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(let ((request-type (gethash seq (gudap--sent-requests conn))))
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(if request-type
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(gudap-handle-response conn request-type body)
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(gudap--message "received response to a nonexistent request. ignoring")))
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(remhash seq (gudap--sent-requests conn)))
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(;; reverse request
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(string-equal type "request")
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(gudap-handle-request conn (intern command) arguments)))))
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(defun gudap--connection-send (conn message)
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(setq message (plist-put message :seq (gudap--next-seq conn)))
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(let* ((json-object-type 'plist)
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(json (jsonrpc--json-encode message))
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(headers `(("Content-Length" . ,(format "%d" (string-bytes json)))))
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(content (cl-loop for (header . value) in headers
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concat (concat header ": " value "\r\n") into header-section
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finally return (format "%s\r\n%s" header-section json))))
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(process-send-string (gudap--process conn) content))
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(setf (gudap--next-seq conn) (1+ (gudap--next-seq conn))))
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;; (defvar gudap-server-programs
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;; '(((elixir-mode elixir-ts-mode) . ("elixir-ls-debug"))))
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;; (defvar gudap-launch-args
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;; `(((elixir-mode elixir-ts-mode) . (("phx" . ,(lambda (project)
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;; (list :type "mix_task"
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;; :name "phx.server"
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;; :request "launch"
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;; :task "phx.server"
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;; :projectDir (file-truename (project-root project)))))))))
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;; (defvar gudap--connections-by-project (make-hash-table :test #'equal)
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;; "Keys are projects. Values are dap connecections.")
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;; (defvar gudap--cached-connection nil)
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;; (defun gudap-reset ()
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;; (interactive)
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;; (clrhash gudap--connections-by-project)
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;; (setq gudap--cached-connection nil))
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;; (defun gudap (managed-major-modes project _class contact language-id &optional interactive)
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;; (interactive (gudap--guess-contact))
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;; (let* ((current-conn (gudap-current-connection))
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;; (live-p (and current-conn (connection-live-p current-conn))))
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;; (if (and live-p
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;; interactive
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;; (y-or-n-p "[gudap] Live process found, reconnect instead? "))
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;; (gudap-reconnect current-conn interactive)
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;; (when live-p (ignore-errors (gudap-shutdown current-conn)))
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;; (gudap--connect managed-major-modes project 'dap-connection contact language-id))))
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;; (defun gudap--guess-contact ()
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;; (let ((eglot-server-programs gudap-server-programs))
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;; (eglot--guess-contact t)))
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;; (defun gudap--lookup-launch-args (mode)
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;; (let ((eglot-server-programs gudap-launch-args))
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;; (eglot--lookup-mode mode)))
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;; (defun gudap-shutdown ()
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;; (interactive)
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;; (let* ((conn (gudap-current-connection)))
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;; (if (dap-process conn)
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;; (kill-buffer (process-buffer (dap-process conn))))
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;; (if (comint-process conn)
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;; (kill-buffer (process-buffer (comint-process conn))))
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;; (remhash (eglot--current-project) gudap--connections-by-project)
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;; (setq gudap--cached-connection nil)))
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;; (defun gudap--connect (managed-modes project class contact language-id)
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;; (let* ((nickname (project-name project))
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;; (readable-name (format "GUDAP (%s/%s)" nickname managed-modes))
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;; (dap-proc (if (integerp (cadr contact))
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;; (open-network-stream
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;; readable-name
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;; (generate-new-buffer readable-name)
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;; (car contact)
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;; (cadr contact)
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;; :sentinel 'dap--server-sentinel
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;; :noquery t)
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;; (make-process :name readable-name
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;; :buffer (generate-new-buffer readable-name)
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;; :command contact
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;; :sentinel 'dap--server-sentinel
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;; :noquery t
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;; :connection-type 'pipe
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;; :coding 'utf-8-emacs-unix)))
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;; (comint-name (format "%s SHELL" readable-name))
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;; (comint-proc (make-process :name comint-name
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;; :buffer (generate-new-buffer comint-name)
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;; :command nil
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;; :noquery t))
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;; (conn (make-instance class
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;; :name readable-name
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;; :dap-process dap-proc
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;; :event-dispatcher 'gudap-event-dispatcher
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;; :response-dispatcher 'gudap-response-dispatcher
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;; :comint-process comint-proc
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;; :launch-args (alist-get managed-modes gudap-launch-args nil nil #'equal))))
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;; (set-process-filter dap-proc 'dap--process-filter)
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;; (setq gudap--cached-connection conn)
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;; (process-put dap-proc 'dap-connection conn)
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;; (process-put comint-proc 'dap-connection conn)
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;; (puthash project conn gudap--connections-by-project)
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;; (gudap--init-comint conn)
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;; (dap--send-initialize conn)))
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;; (defun gudap--init-comint (conn)
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;; (let ((buffer (process-buffer (comint-process conn))))
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;; (with-current-buffer buffer
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;; (comint-mode)
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;; (setq-local comint-input-sender #'gudap-comint-receive)
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;; (setq-local comint-prompt-regexp "^> ")
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;; (setq-local comint-use-prompt-regexp t))))
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;; (defun gudap-comint-receive (proc message)
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;; (message message))
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;; (defun gudap-comint-send (conn message)
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;; (comint-output-filter
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;; (comint-process conn)
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;; (format "%s\n" message)))
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;; (defun gudap-event-dispatcher (conn message)
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;; (cl-destructuring-bind (&key event body &allow-other-keys)
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;; message
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;; (cond
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;; (
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;; (equal event "output")
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;; (gudap-comint-send conn (plist-get body :output)))
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;; (
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;; (equal event "initialized")
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;; (dap--send-all-breakpoints conn)
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;; (dap--send-config-done conn)))))
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;; (defun gudap-response-dispatcher (conn message)
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;; (cl-destructuring-bind (&key command request_seq body &allow-other-keys)
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;; message
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;; (cond
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;; (
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;; (equal command "setBreakpoints")
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;; (gudap--verify-breakpoints conn message)))))
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;; (defun gudap--verify-breakpoints (conn message)
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;; (cl-destructuring-bind (&key request_seq body &allow-other-keys)
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;; message
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;; (let* ((bp-results-vector (plist-get body :breakpoints))
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;; (bp-results (append bp-results-vector nil)) ;; convert to list
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;; (bp-path (gethash request_seq (breakpoints-req-seq conn)))
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;; (pending-bps (gethash bp-path (breakpoints conn)))
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;; (valid-bps (gudap--validate-breakpoints pending-bps bp-results)))
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;; (puthash bp-path valid-bps (breakpoints conn))
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;; (remhash request_seq (breakpoints-req-seq conn))
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;; (message "breakpoints validated"))))
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;; (defun gudap--validate-breakpoints (bps bp-results)
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;; (if (/= (length bps) (length bp-results))
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;; (error "Breakpoints and breakpoints results must be the same length."))
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;; (let ((bp (car bps))
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;; (bp-result (car bp-results)))
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;; (cond
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;; (
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;; (null bp)
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;; '())
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;; (
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;; (plist-get bp-result :verified)
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;; (cons bp (gudap--validate-breakpoints (cdr bps) (cdr bp-results))))
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;; (
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;; (not (plist-get bp-result :verified))
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;; (gudap--validate-breakpoints (cdr bps) (cdr bp-results))))))
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;; (defun dap--send-breakpoints (conn path breakpoints)
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;; (puthash (next-seq conn) path (breakpoints-req-seq conn))
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;; (dap-connection-send
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;; conn
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;; (list :seq (next-seq conn)
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;; :type "request"
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;; :command "setBreakpoints"
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;; :arguments
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;; (list :source `(:path ,path)
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;; :breakpoints (vconcat breakpoints)))))
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;; (defun dap--send-all-breakpoints (conn)
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;; (maphash
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;; (lambda (path bps)
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;; (dap--send-breakpoints conn path bps))
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;; (breakpoints conn)))
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;; (defun gudap-current-connection ()
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;; "Return logical Gudap server for current buffer, nil if none."
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;; (setq gudap--cached-connection
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;; (or gudap--cached-connection
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;; (gethash (eglot--current-project) gudap--connections-by-project))))
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;; (defun gudap-launch (conn)
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;; (interactive (list (gudap-current-connection)))
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;; (let* ((launch-keys (mapcar (lambda (elem) (car elem)) (launch-args conn)))
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;; (launch-key (read-from-minibuffer "What launch config to use? "
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;; launch-keys))
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;; (launch-args (funcall (alist-get launch-key (launch-args conn) nil nil #'equal) (project-current))))
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;; (dap--send-launch conn launch-args)))
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;; (defun dap--send-initialize (conn)
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;; (let ((message (list :seq (next-seq conn)
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;; :type "request"
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;; :command "initialize"
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;; :arguments (list :adapterID "dummy"
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;; :supportsProgressReporting t))))
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;; (dap-connection-send conn message)))
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;; (defun dap--send-launch (conn launch-args)
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;; (let ((message (list :seq (next-seq conn)
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;; :type "request"
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;; :command "launch"
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;; :arguments launch-args)))
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;; (dap-connection-send conn message)))
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;; (defun dap--send-config-done (conn)
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;; (let ((message (list :seq (next-seq conn)
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;; :type "request"
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;; :command "configurationDone")))
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;; (dap-connection-send conn message)))
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;; (defun dap--server-sentinel (proc event)
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;; (let ((conn (process-get proc 'dap-connection)))
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;; (remhash (eglot--current-project) gudap--connections-by-project))
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;; (setq gudap--cached-connection nil))
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;; (defun dap-connection-send (conn message)
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;; ;; (message "\nSending message:\n")
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;; ;; (pp message)
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;; ;; (message "\n")
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;; (let* ((json-object-type 'plist)
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;; (json (jsonrpc--json-encode message))
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;; (headers `(("Content-Length" . ,(format "%d" (string-bytes json)))))
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;; (content (cl-loop for (header . value) in headers
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;; concat (concat header ": " value "\r\n") into header-section
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;; finally return (format "%s\r\n%s" header-section json))))
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;; (process-send-string (dap-process conn) content))
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;; (setf (next-seq conn) (1+ (next-seq conn))))
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2023-06-10 23:36:35 -04:00
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2023-06-10 13:52:12 -04:00
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;;;###autoload
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(provide 'gudap)
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;;; gudap.el ends here
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