Half-decent xref support

* eglot.el
(eglot--xref-known-symbols): New hacky var.
(eglot--xref-reset-known-symbols): New helper.
(xref-find-definitions, xref-find-references): Advise after to
call the new helper.
(xref-backend-identifier-completion-table): Rework.
(eglot--xref-make): New helper.
(xref-backend-definitions): Use it.
(xref-backend-references, xref-backend-apropos): Implement.
(eglot--obj): Add a debug spec.
(eglot--lambda): Add debug spec.

Very basic xref support

* eglot.el (eglot--pos-to-lisp-position): Move up.
(eglot--mapply, eglot--lambda): New helpers.
(eglot--uri-to-path): New helper.
(eglot--managed-mode): Manage xref-backend-functions.
(eglot-xref-backend): New function.
(xref-backend-identifier-completion-table)
(xref-backend-identifier-at-point)
(xref-backend-definitions): New methods.
(xref-backend-references)
(xref-backend-apropos): New methods, still unimplemented.

New helper eglot--sync-request

This should help with xref definitions

* eglot.el (eglot--request): Rework a bit. Continuation is always
cleared on timeout, regardless of user-supplied fn.
(eglot--sync-request): New function.
(eglot--process-receive): watch out for vector results.

Cleanup mistake with textdocumentitem and textdocumentidentifier

Also introduce eglot--path-to-uri

* eglot.el (eglot--path-to-uri): Rename from eglot--uri and rework.
(eglot--connect): Use it.
(eglot--current-buffer-TextDocumentIdentifier): New function.
(eglot--current-buffer-VersionedTextDocumentIdentifier)
(eglot--signal-textDocument/didChange)
(eglot--signal-textDocument/didClose)
(eglot--signal-textDocument/willSave)
(eglot--signal-textDocument/didSave): Use it.

Handle dynamic registration in general (but nothing specific yet)

* eglot.el (eglot--server-client/registerCapability): Implement.
(eglot--register-workspace/didChangeWatchedFiles): Dummy registrator.

Honour textdocumentsync

* eglot.el (eglot--signal-textDocument/didChange): Honour textDocumentSync

Be quite explicit about our lack of capabilities right now

* eglot.el (eglot--client-capabilities): Spread out.

Use rooturi instead of rootpath

* eglot.el (eglot--connect)
(eglot--current-buffer-VersionedTextDocumentIdentifier): Use
eglot--uri.
(eglot--uri): New function.

Make reported capabilities into its own function

* eglot.el (eglot--client-capabilities): New function.
(eglot--connect): Use it.

Include source info in diagnostics

* eglot.el (eglot--server-textDocument/publishDiagnostics):
Include source info.

Reply to client/registercapability (don't handle it yet)

* eglot.el (eglot--server-client/registerCapability): New
function.

Handle requests from server correctly

* eglot.el (eglot--process-receive): Redesign.
(eglot--process-send): Take REPLY arg. Discover if message is error.
(eglot--reply): new function
(eglot--log-event): Tweak docstring.
(eglot--process-receive): Reply with -32601 if unimplemented.
(eglot--server-window/showMessageRequest)
(eglot--server-client/registerCapability): Use eglot--reply

Don't auto-reconnect if last attempt lasted less than 3 seconds

* eglot.el (eglot--inhibit-auto-reconnect): New var.
(eglot--process-sentinel): Use it.

Workaround rls's regusal to treat nil as empty json object

* eglot.el (eglot--connect): Use dummy params.

Eglot-editing-mode becomes eglot--managed-mode

* eglot.el (eglot--sentinel): Use eglot--managed-mode.
(eglot--managed-mode-map): Renamed from eglot-editing-mode-map.
(eglot--managed-mode): Renamed from eglot-editing-mode.
(eglot-mode): Simplify.
(eglot--buffer-managed-p): New function.
(eglot--maybe-activate-editing-mode): Simplify.

Make m-x eglot's interactive spec a separate function

* eglot.el (eglot--interactive): New function.
(eglot): Rework a little.

When user declines to reconnect, first quit existing server

* eglot.el (eglot): Rework reconnection logic.

Connect to lsp server via tcp

* eglot.el (eglot--make-process): Rename from
eglot-make-local-process.
(eglot): Fix docstring and rework.
(eglot--bootstrap-fn): Remove
(eglot--contact): New process-local var.
(eglot--connect): Take CONTACT arg.
(eglot--reconnect): Rework.

More correctly keep track of didopen/didclose per buffer

* eglot.el (eglot--buffer-open-count): Now a process-local var.
(eglot--signal-textDocument/didOpen, eglot--signal-textDocument/didClose):
Use it.

Fix mode-line mouse-clicks from outside selected window

* eglot.el (eglot--mode-line-call): New helper.
(eglot--mode-line-format): Use it.

* eglot.el (eglot--process-receive): skip null method notifs.

Trim some edges and add a bunch of boring rpc methods

* eglot.el (eglot--connect): Don't call eglot--protocol-initialize.
(eglot--process-filter): Break long line.
(eglot--process-receive): Also pass id to handler if a server request.
(eglot--log): New helper.
(eglot-editing-mode): Manage before-revert-hook,
after-revert-hook, before-save-hook, after-save-hook.
(eglot--protocol-initialize): Removed.
(eglot--server-window/showMessage): Simplify.
(eglot--server-window/showMessageRequest)
(eglot--server-window/logMessage, eglot--server-telemetry/event):
New handlers.
(eglot--signal-textDocument/willSave)
(eglot--signal-textDocument/didSave): New notifications.
(eglot--signal-textDocument/didOpen)
(eglot--signal-textDocument/didClose): Check
eglot--buffer-open-count.
(eglot--buffer-open-count): New var.

Fix a couple of rust-related edge cases

* eglot.el (eglot--server-window/progress): Allow other keys.
(eglot--server-textDocument/publishDiagnostics): Allow :group in diagnostic
spec.

Fix textdocument/didchange

* eglot.el (eglot-editing-mode): Manage before-change-functions.
(eglot--recent-changes): Deleted.
(eglot--recent-before-changes): New var.
(eglot--recent-after-changes): Renamed from eglot--recent-changes.
(eglot--pos-to-lsp-position, eglot--before-change): New helpers.
(eglot--after-change): Rework.
(eglot--signal-textDocument/didChange): Rework.

Rename rpc methods for clarity

* eglot.el (eglot--process-receive): Search for RPC server methods
under `eglot--server-'
(eglot-editing-mode, eglot--maybe-activate-editing-mode): Use new
signal names.
(eglot--server-window/showMessage): Rename from
eglot--window/showMessage.
(eglot--server-textDocument/publishDiagnostics): Renamed from
eglot--textDocument/publishDiagnostics.
(eglot--current-buffer-versioned-identifier): Remove.
(eglot--current-buffer-VersionedTextDocumentIdentifier): Use
eglot--versioned-identifier.
(eglot--signal-textDocument/didChange): Renamed from
eglot--maybe-signal-didChange.
(eglot--signal-textDocument/didOpen): Renamed from
eglot--signalDidOpen.
(eglot--signal-textDocument/didClose): Rename from
eglot--signalDidClose.
(eglot-flymake-backend): Call eglot--signal-textDocument/didChange.
(eglot--server-window/progress): Rename from
eglot--window/progress.

Reorganize file

* eglot.el (eglot-mode-line): Move up.
(eglot-make-local-process, eglot--all-major-modes, eglot--obj)
(eglot--project-short-name, eglot--all-major-modes)
(eglot-reconnect, eglot--maybe-activate-editing-mode)
(eglot--protocol-initialize)
(eglot--window/showMessage, eglot--current-flymake-report-fn)
(eglot--unreported-diagnostics)
(eglot--textDocument/publishDiagnostics, eglot--signalDidOpen)
(eglot--signalDidClose): Move around.
(eglot-quit-server): Renamed to eglot-shutdown.
(eglot-shutdown): New function

Delete two useless forward declarations

* eglot.el (eglot-mode, eglot-editing-mode-map): Remove forward decls.

Fix flymake diagnostic positions

It's better not to use flymake-diag-region here.

* eglot.el (eglot--textDocument/publishDiagnostics):
Calculate position by hand.

Must re-announce didopen after reconnect

* eglot.el (eglot-reconnect): Also call
eglot--maybe-activate-editing-mode for all buffers.

Fix another flymake sync bug

* eglot.el (eglot-flymake-backend): Only report unreported sometimes.
(eglot--maybe-activate-editing-mode): Start flymake explicitly
when didOpen.
(eglot--textDocument/publishDiagnostics): No need to set
unreported-diagnostics to nil.
(flymake): Require it.

Make m-x eglot the main entry point

* eglot.el (eglot-new-process): Removed
(eglot): Rename from eglot-new-process.
(eglot-editing-mode): Mention M-x eglot

* README.md: Use M-x eglot

Fix assorted bugs

* eglot.el (eglot--special-buffer-process): Must be buffer-local.
(eglot--define-process-var): Fix disaster waiting to happen.
(eglot--process-receive): Explicitly pass PROC to
eglot--pending-continuations.
(eglot--textDocument/publishDiagnostics): Clear unreported diagnostics

Watch for files opened under umbrella of existing process

* eglot.el (eglot--connect): Call success-fn with a proc.
(eglot-reconnect): Adapt to new eglot--connect.
(eglot-new-process): Call eglot--maybe-activate-editing-mode
(eglot--maybe-activate-editing-mode): New function.
(find-file-hook): Add it here.

Multiple servers per project are possible

A server manages a specific major-mode within a project.

* eglot.el (eglot--processes-by-project): Add docstring.
(eglot--current-process): Search new eglot--processes-by-project
format.
(eglot--major-mode): New variable.
(eglot--moribund, eglot--project): Update docstring.
(eglot--project-short-name, eglot--all-major-modes): New helpers.
(eglot--connect): Rework.
(eglot-new-process): Rework severely.
(eglot--command-history): New variable.
(eglot--process-sentinel): Use new
eglot--processes-by-project. Update mode line.
(eglot-editing-mode): Don't start processes, just suggest it.

Appease checkdoc.el

* eglot.el (eglot--process-send, eglot--next-request-id)
(eglot--current-buffer-VersionedTextDocumentIdentifier)
(eglot--current-buffer-TextDocumentItem)
(eglot--after-change, eglot--signalDidOpen)
(eglot--signalDidClose, eglot--maybe-signal-didChange):
Add docstring.

Simplify flymake integration

And get rid of the ridiculous environment thingy

* eglot.el (eglot--process-sentinel): Continuations are triplets.
(eglot--environment-vars, eglot--environment): Remove.
(eglot--process-receive): Simplify.
(eglot--unreported-diagnostics): New variable.
(eglot--textDocument/publishDiagnostics): Simplify.
(eglot-flymake-backend): Report unreported diagnostics.

Signal textdocument/didclose

* eglot.el (eglot-editing-mode): Signal didClose.
(eglot--signalDidClose): New.

Rework connection restarting again

Quitting a process removes it from the project.

* eglot.el (eglot-editing-mode,eglot-mode): Forward declare.
(eglot--project): New process-local var.
(eglot--connect): Takes a project.
(eglot-new-process): Rework.
(eglot--sentinel): Remove proc from eglot--processes-by-project.

Redesign and simplify parser

Fix horrible bugs. This is the correct way.

* eglot.el (eglot--process-filter): Redesign.

Auto-reconnect on unexpected connection loss

* eglot.el (eglot-reconnect): Only quit if indeed not quit
already.
(eglot-new-process): Burn the command in the bootstrap fn.
(eglot--process-sentinel): Automatically reconnect if closed
unexpectedly.
(eglot--warn): Also message to *Messages*

Ready to start fixing flymake integration

* eglot.el (eglot-editing-mode): Turn on flymake-mode.
(eglot-flymake-backend): Always start by reporting no diagnostics.
(eglot--textDocument/publishDiagnostics): No annoying message.

Slightly more user friendly start

* eglot.el (eglot-new-process): signal DidOpen for every file in project.
(eglot-editing-mode): Offer to start process.

Don't clutter ui with warnings

* eglot.el (warnings): require it.
(eglot--warn): set warning-minimum-level

Rework commands for connecting and reconnecting

* eglot.el (eglot--current-process-or-lose): Add doc.
(eglot--command): Remove.
(eglot--bootstrap-fn): New process-local variable.
(eglot--connect): Redesign.
(eglot-make-local-process): New function.
(eglot-reconnect): New interactive command.
(eglot-new-process): Redesign.
(eglot--process-sentinel): Add doc.
(eglot--protocol-initialize): Rework.
(eglot--mode-line-format): Use eglot-reconnect.

Less obstrusive flymake stuff for now

* eglot.el (eglot--after-change, eglot-flymake-backend): Fix.

Events buffer uses eglot-mode, source buffers use eglot-editing-mode

* eglot.el (eglot--special-buffer-process): New var.
(eglot--current-process): Consider eglot--special-buffer-process.
(eglot-events-buffer): Use eglot-mode
(eglot-editing-mode): New minor mode.
(eglot-mode): Turns on eglot-editing-mode maybe.

Change status to error everytime an error is found

* eglot.el (eglot--process-receive): Also set error status.
(eglot--request): Fix a compilation warning.

Correctly report what we currently are capable of

Which is almost nothing.

* eglot.el (eglot--protocol-initialize): Clean up.

Add eglot-clear-status interactive command

* eglot.el (eglot-clear-status): New
(eglot-forget-pending-continuations): Fix bug.
(eglot--mode-line-format): Add link to eglot-clear-status.

Auto update mode-line after setting some process properties

* eglot.el (eglot--define-process-var): Rework.
(eglot--short-name, eglot--spinner, eglot--status): Update mode-line
after setting it.

Start experimenting with python

* eglot.el (eglot-executables): Add pyls.

Don't switch to possibly dead buffer in sentinel

* eglot.el (eglot--process-sentinel): Don't with-current-buffer.

Report server status in the mode-line

* eglot.el (eglot--status): New var.
(eglot--log-event): Try to be more useful for other stuff.
(eglot--protocol-initialize): Set status to nil on
successful connect.
(eglot--window/showMessage): Set status to error if needed.
(eglot--mode-line-format): Display status if serious.

Implement spinners and rls's window/progress

* eglot.el (eglot--window/progress): New.
(eglot--mode-line-format): Rework.
(eglot--snpinner): New var.
(compile): require it.

Fix parser to accept multiple messages in one chunk

* eglot.el (eglot--process-filter): Redesign slightly.
(eglot--message-mark): Remove. don't need this.

Lay groundwork for uniform treatment of network connections

* eglot.el (eglot--connect): New helper.
(eglot-new-process): Use it.
(pcase): Require it.

Doc fixes

* eglot.el (eglot-mode-map): Move up before minor mode.

* eglot.el (eglot-mode-map): move up before minor mode.

Start working on this again

* eglot.el (url-util): Require it.
(eglot--process-sentinel): pending continuations now are quads (added env).
(eglot--process-filter): Unwind message markers correctly if handling fails.
(eglot--obj): Simple macro.
(eglot--log-event): Add some info to logged event.
(eglot--environment-vars, eglot--environment): Helper vars.
(eglot--process-receive): Improve.
(eglot--process-send): Niver log.
(eglot--request): Use eglot--obj. Add environment.
(eglot--notify): New helper.
(eglot--protocol-initialize): RLS must like file://
(eglot--current-flymake-report-fn): New var.
(eglot--textDocument/publishDiagnostics): Use flymake from Emacs 26.
(eglot-mode): Proper minor mode.
(eglot--recent-changes, eglot--versioned-identifier): New stuff.
(eglot--current-buffer-versioned-identifier)
(eglot--current-buffer-VersionedTextDocumentIdentifier)
(eglot--current-buffer-TextDocumentItem, eglot--after-change)
(eglot--signalDidOpen, eglot--maybe-signal-didChange): New stuff.
(eglot-flymake-backend): More or less a flymake backend function.

Fix mode line

* eglot.el (mode-line-misc-info): conditionalize to eglot-mode

Fix some byte-compilation warnings

Overhaul async mechanism safety

Simplify `eglot--protocol-initialize`

* eglot.el (eglot--protocol-initialize): Simplify

Experimental diagnostic overlays

Minor cleanup

Cancel timeouts when process dies unexpectedly

Organize a bit

Improve `eglot--current-process'

Handle notifications

Introduce and use `eglot--current-process-or-lose'

Add a mode-line construct and some minor fanciness

Rename eglot--continuations eglot--pending-continuations

Remove a couple of comments

Initial commit