Work with any old directory, no formal project needed

Actually, uses a "transient project" which project-current returns if
desperate.

* README.md: Update

* eglot.el (eglot--current-process)
(eglot--current-process-or-lose): Simplify.
(eglot): Maybe prompt user for project.

Ask server for textdocument/signaturehelp if it supports it

* eglot.el (eglot--client-capabilities): Capable of signature Help.
(eglot--sig-info): Helper for eglot-eldoc-function.
(eglot-eldoc-function): Send textDocument/signatureHelp

* README.md: Update to mention textDocument/signatureHelp

Fix copyright header. obviously not since 2003

Reinstate the catch/loop/throw idiom in eglot-request

This reverts parts of commit fabee14ed5b32c30c6ac5cb1ce88f387522a6a1e.

Unfortunately, this may cause problems when calling the error
callbacks directly as in the process sentinel. In that particular
scenario the accept-process-output won't have return, because no
output has is being handled. Consequently, if we're unlucky, we have
another 30 seconds to way before the flag is tested and the loop
exits.

* eglot.el (eglot-request): Use catch/loop/throw again

New command eglot-help-at-point and a readme update

* README.md (Commands and keybindings): New section.

* eglot.el (eglot-eldoc-function): Use eglot--hover-info.
Don't care about kind in highlightSymbol
(eglot--hover-info): New helper.
(eglot-help-at-point): New command.

Get rid of catch/loop/throw idiom (suggested by thien-thi nguyen)

* eglot.el (eglot--process-filter)
(eglot--request): Replace catch/loop/throw idiom with let/test/loop/set

Rework autoreconnection logic

Can't be a global var, has to be a per process thing.

* eglot.el (eglot-autoreconnect): New defcustom
(eglot--inhibit-autoreconnect): Renamed from eglot--inhibit-autoreconnect
(eglot--connect): Run autoreconnect timer here.
(eglot--inhibit-auto-reconnect): Removed.
(eglot--process-sentinel): Don't run timer here. Rework.
(eglot, eglot-reconnect): Pass INTERACTIVE to eglot--connect.

Duh, json.el is in emacs, and json-mode.el is useless here

* eglot.el (Package-Requires): Don't require json-mode

Prepare to sumbit to gnu elpa

* eglot.el: Update headers.

(eglot--xref-make): fix use of cl-destructuring-bind.

Misc little adjustments for readability

* eglot.el (eglot--log-event, eglot--process-receive)
(eglot--xref-make, xref-backend-apropos): Use cl-destructuring-bind.
(eglot--server-window/showMessageRequest): Compact.

Support :completionitem/resolve

This is quite handy with company and company-quickhelp

* eglot.el (eglot-completion-at-point): Send
:completionItem/resolve

* README.md: Mention completionItem/resolve

Rename functions. eglot--request is now the synchronous one

* eglot.el (eglot--connect, eglot-shutdown)
(xref-backend-identifier-completion-table)
(xref-backend-definitions, xref-backend-references)
(xref-backend-apropos, eglot-completion-at-point, eglot-rename):
Call eglot--request.
(eglot--async-request): Renamed from eglot--request.
(eglot--request): Renamed from eglot--sync-request.
(eglot--TextDocumentIdentifier)
(eglot--VersionedTextDocumentIdentifier)
(eglot--TextDocumentPositionParams, eglot--TextDocumentItem):
Renamed from the more verbose eglot--current-buffer-* variante.
(eglot-rename, eglot-imenu, eglot-eldoc-function)
(eglot-completion-at-point, xref-backend-definitions)
(xref-backend-identifier-at-point)
(eglot--signal-textDocument/didSave)
(xref-backend-identifier-completion-table)
(eglot--signal-textDocument/didClose)
(eglot--signal-textDocument/didOpen)
(eglot--signal-textDocument/didChange): Use new function names.

Friendlier m-x eglot

* eglot.el (eglot-server-programs): Renamed from eglot-executables
(eglot--interactive): Redesign
(eglot): Docstring.
(eglot--connect): Now a synchronous gig.
(eglot--interactive): Friendlier.
(eglot): Improve docstring, rework a bit.
(eglot-reconnect): Rework a bit.
(eglot--process-sentinel): Insert "byebye" ruler here.

* README.md: Update

Improve eglot-eldoc-function

Use the :range key if the server provided it. Also simplify code with
a new eglot--with-lsp-range macro.

* eglot.el (eglot--format-markup): Tweak comment.
(eglot--with-lsp-range): New helper macro.
(eglot--server-textDocument/publishDiagnostics)
(eglot--apply-text-edits): Use it.
(eglot-eldoc-function): Use range if server provides it.

Reduce log chatter

* eglot.el (eglot--process-sentinel, eglot--request): Use
eglot--log-event.
(eglot--log-event): Print "message" if type unknown.
(eglot--debug, eglot--log): Remove.
(eglot--server-window/logMessage, eglot--server-telemetry/event):
Make noops.
(eglot--call-deferred): Also reduce chatter here.

Only call deferred actions after a full message has been received

Otherwise it can be quite wasteful.

* eglot.el (eglot--process-filter): Don't eglot--call-deferred here.
(eglot--process-receive): Do it here.

Resist server failure during synchronous requests

Calling the error handler unprotected could lead to the rest of the
sentinel not running at all. This defeated the auto-reconnection in
Rust, for example.

* eglot.el (eglot--process-sentinel): Rework.

Simplify mode-line updating logic

* eglot.el (eglot--define-process-var): Simplify.
(eglot--short-name, eglot--spinner, eglot--status): Don't
auto-update mode-line.
(eglot--process-receive): Update it here.

More rls-specifics: update flymake diags when indexing done

RLS could/should report diagnostics for every opened file, even if
there aren't any problems. Because it doesn't, loop for every buffer
managed by the process and call eglot--current-flymake-report-fn

* eglot.el
(eglot--server-window/progress): Call eglot--current-flymake-report-fn

Adjust flymake integration

When opening a new file (signalling textDocument/didOpen) it makes
sense to call the flymake callback (if it exists) with no diagnostics,
just to get rid of that "Wait", since we don't know if later in this
callback cycle the server will ever report new diagnostics.

* eglot.el (eglot--managed-mode): Don't call flymake-mode or eldoc-mode
(eglot--managed-mode-hook): Add them here.
(eglot--maybe-activate-editing-mode): Call flymake callback.
(eglot--server-textDocument/publishDiagnostics): Set unreported
diagnostics to nil if invoking callback.

Shorten summary line to appease package-lint.el

More correctly setup rust-mode-related autoloads

By autoloading the add-hook form and the eglot--setup-rls-idiosyncrasies
definition, a user can start rust-mode without loading eglot.el along
with it.

* eglot.el (rust-mode-hook)
(eglot--setup-rls-idiosyncrasies): Wrap in autoloaded progn.

Add minimal headers, commentary and autoloads

Fancier rls spinner

* eglot.el (eglot--mode-line-format): Use (nth 3) of
eglot--spinner.
(eglot--server-window/progress): Save detail message in spinner.

New "deferred requests" that wait until server is ready

Calling textDocument/hover or textDocument/documentHighlight before
the server has had a chance to process a textDocument/didChange is
normally useless. The matter is worse for servers like RLS which only
become ready much later and send a special notif for it (see
https://github.com/rust-lang-nursery/rls/issues/725).

So, keeping the same coding style add a DEFERRED arg to eglot--request
that makes it maybe not run the function immediately. Add a bunch of
logic for probing readiness of servers.

* README.md: Update

* eglot.el (eglot--deferred-actions): New process-local var.
(eglot--process-filter): Call deferred actions.
(eglot--request): Rewrite.
(eglot--sync-request): Rewrite.
(eglot--call-deferred, eglot--ready-predicates)
(eglot--server-ready-p): New helpers.
(eglot--signal-textDocument/didChange): Set spinner and call
deferred actions.
(eglot-completion-at-point): Pass DEFERRED to eglot-sync-request.
(eglot-eldoc-function): Pass DEFERRED to eglot-request
(eglot--rls-probably-ready-for-p): New helper.
(rust-mode-hook): Add eglot--setup-rls-idiosyncrasies
(eglot--setup-rls-idiosyncrasies): New helper.

Call eglot-eldoc-function after completion finishes

* eglot.el (eglot-completion-at-point): Call
eglot-eldoc-function after completion finishes.

Simplify `eglot-shutdown`

* eglot.el (eglot, eglot-reconnect)
(eglot--managed-mode): Call new eglot-shutdown.
(eglot-shutdown): Simplify.
(eglot--process-sentinel): Also call error functions.
(eglot--process-filter): Reindent.

Get rid of eglot-mode

* eglot.el (eglot--managed-mode): Don't call eglot-mode. When
shutting down, offer to kill server.
(mode-line-misc-info): Update to use eglot--managed-mode

Simplify eglot--signal-textdocument/didchange

* eglot.el (eglot--recent-before-changes)
(eglot--recent-after-changes): Delete.
(eglot--recent-changes): New var.
(eglot--outstanding-edits-p, eglot--before-change)
(eglot--after-change): Rewrite.
(eglot--signal-textDocument/didChange): Rewrite.
(eglot--signal-textDocument/didOpen): Initialize
buffer-local eglot--recent-changes here.

Fix odd bugs and tweak stuff

* eglot.el (eglot--log-event): Insert before markers.
(eglot--process-receive): Shave lines.
(xref-backend-references): Use cl-return-from.
(eglot--log-event): Simplify
(eglot-completion-at-point): Saner annotation

Support workspace/applyedit

* eglot.el (eglot--reply): Don't send result or error if not
provided.
(eglot--server-workspace/applyEdit): New server method.
(eglot--apply-text-edits): Rework.
(eglot--apply-workspace-edit): New helper.
(eglot-rename): Simplify.

Support textdocument/rename

* README.md: Mention rename support.

* eglot.el (eglot--uri-to-path): Handle uri hidden in keywords.
(eglot--apply-text-edits): New helper.
(eglot-rename): New interactive command.
(eglot--client-capabilities): Add rename capability.

Reasonable textdocument/documenthighlight support

* README.md: Update.

* eglot.el (eglot--current-buffer-TextDocumentPositionParams): New
helper.
(xref-backend-identifier-completion-table): Refactor a bit.
(xref-backend-identifier-at-point): Use when-let and
eglot--current-buffer-TextDocumentPositionParams
(xref-backend-definitions, xref-backend-references): Refactor a
bit.
(eglot-completion-at-point): Use
eglot--current-buffer-TextDocumentPositionParams
(eglot-eldoc-function): Rewrite to handle
textDocument/documentHighlight.
(eglot--highlights): New variable.
(eglot--client-capabilities): Update with support for documentHighlight.

Fix odd bugs

* eglot.el (eglot--process-receive, eglot--request): Set status to
actual error message.
(eglot--managed-mode): Manage imenu-create-index-function
correctly.
(eglot--mode-line-format): Print error status.

When killing server, always wait 3 seconds

* eglot.el (eglot--request): Accept TIMEOUT param.

Try to fix some textdocument/completion bugs

* eglot.el (eglot-completion-at-point): Rework slightly.

Half-decent imenu support via textdocument/documentsymbol

* README.md: Update capability

* eglot.el (eglot--lsp-position-to-point): New function.
(eglot--managed-mode): Handle imenu-create-index-function.
(eglot--server-textDocument/publishDiagnostics): Use
eglot--lsp-position-to-point.
(eglot-imenu): New function.
(eglot--client-capabilities): Capable of documentSymbol.

Only request stuff that server says it's capable of

* eglot.el (eglot--server-capable): New helper.
(eglot-xref-backend)
(xref-backend-identifier-completion-table)
(xref-backend-references, xref-backend-apropos)
(eglot-completion-at-point, eglot-eldoc-function): Use it.

Simplify mode-line code with a helper.

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

Get rid of eglot--buffer-open-count

Hasn't really proved useful yet.

* eglot.el (eglot--buffer-open-count): Remove.
(eglot--signal-textDocument/didOpen)
(eglot--signal-textDocument/didClose): Simplify.

Get rid of eglot--special-buffer-process

Hasn't really proved useful yet.

* eglot.el (eglot--special-buffer-process): Delete.
(eglot--current-process): Simplify.
(eglot--events-buffer): Simplify.

* eglot.el: reformat to shave off some lines.

Fix bug in hover support

* eldoc.el (eglot-eldoc-function): Use eglot--format-markup.
(subr-x): Require it.
(eglot--format-markup): Pacify byte-compiler.

Clean up client capabilities

* eglot.el (eglot--client-capabilities): Clean up client
capabilities.

Half-baked textdocument/hover support

* eglot.el (eglot--format-markup): New helper.
(eglot--managed-mode): Handle eldoc-documentation-function.
(eglot-eldoc-function): New function.

* README.md: update

Tweak the async request engine.

* eglot.el (eglot--request): Return the continuation id.
(eglot--lambda): Move up in the file.
(eglot--sync-request): Use a catch-tag.

Explain why didopen on after-revert-hook is a bad idea

The reason is that the global find-file-hook is called again, and that
already does the didOpen. Too many didOpen's would be bad.

* eglot.el (eglot--managed-mode): Remove commented lines.

Half-decent completion support

* README.md: Update.

* eglot.el (eglot--kind-names): New variable.
(eglot--managed-mode): Handle completion-at-point-functions.
(eglot-completion-at-point): New function.

Solve another textdocument/didchange bug

* eglot.el (eglot--signal-textDocument/didChange): Rework a bit.
(eglot--after-change): Store the actual after-text in the
eglot--recent-after-changes.

Support javascript's javascript-typescript-langserver

* README.md: Improve a bit

* eglot.el (eglot--make-process): Take MANAGED-MAJOR-MODE arg
(eglot-executables): Add basic javascript support.
(eglot--connect): Pass mode to eglot--make-process
(eglot--interactive): Check that guessed command is a listp.
(eglot): Minor improvement to message.
(eglot--current-buffer-TextDocumentItem): Guess language from mode
symbol.

Increase request timeout length to 10 seconds

* eglot.el (eglot-request-timeout): New var.
(eglot--request): Use it.

Workaround two suspected emacs bugs

* eglot.el (eglot--process-filter): Use a proper unique tag. Use
unwind-protect.
(eglot--sync-request): Rework.
(eglot--server-client/registerCapability): Use a proper done tag.

Etoomanylambdas

* eglot.el (eglot--sync-request): Remove a lambda.

Fix the odd bug here and there

* eglot.el (eglot--connect): Activate editing mode where
applicable here.
(eglot, eglot-reconnect): Not here or here.
(eglot--process-sentinel): Catch auto-reconnect errors.
(eglot--notify): Dont send 'id=null', it messes up js's lsp
(eglot--reply): Do send id here.
(eglot--log-event): Simplify protocol. Complexify implementation.
(eglot--process-receive, eglot--process-send): Simplify
eglot--log-event call.
(eglot--request, eglot--notify, eglot--reply): Simplify
eglot--process-send call
(eglot--server-client/registerCapability): Fix bug when replying
with wrong id.
(eglot--xref-reset-known-symbols): Take DUMMY arg.

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.