Move constants to top instead of forward-declaring

* eglot.el (eglot--symbol-kind-names, eglot--kind-names): Move to
top of file.

Support ocaml-language-server out of the box ()

Copyright-paperwork-exempt: yes

* eglot.el (eglot-server-programs): Add ocaml-language-server.

* README.md (Installation and usage): Mention ocaml-language-server

GitHub-reference: https://github.com/joaotavora/eglot/issues/149

* eglot.el (eglot-client-capabilities): mention supported symbolkinds.

Make imenu hierarchical

* eglot.el (eglot-imenu): Use :containerName to build a nested imenu
  index alist.

Fix a bug when response to definitions request is a single location

It's valid to return just a single Location for a definitions request.

* eglot.el (xref-backend-definitions): Coerce response to a vector.

Simplify eglot-code-action. fix compilation warning

* eglot.el (eglot-code-actions): Simplify.
(eglot-client-capabilities): Mention supported codeActionKind's
directly.
(eglot--code-action-kinds): Remove.

Add support for code action literals

Code action literals allow the server to simply return a WorkspaceEdit
for a code action, so the client does not have to execute a command.

* eglot.el (eglot-client-capabilities): Add :codeActionLiteralSupport.
(eglot--code-action-kinds): New variable.
(eglot-code-actions): Apply provided WorkspaceEdit.

Use the container name of a symbol in imenu

* eglot.el (eglot-imenu): Prepend :containerName to each symbol, when
  provided.

Don't ignore unknown symbolkinds in imenu

Some servers provide custom SymbolKinds.  For example, ccls says that
symbols defined with #define are of kind 255.

* eglot.el (eglot-imenu): Don't delete elements with unknown symbol
  kind from the return list, instead put them in `(Unknown)` group.

Remove duplicates from imenu

* eglot.el (eglot-imenu): Don't append the result list to itself,
  which causes duplicates.

Require subr-x at compile time ()

if-let and when-let are macros that the byte compiler can expand
at compile time. No need to require subr-x at run time.

* eglot.el (subr-x): Require only when compiling.

GitHub-reference: https://github.com/joaotavora/eglot/issues/139

Accept deprecated field in symbolinformation

* eglot.el (xref-backend-identifier-completion-table)
(eglot-imenu): Accept and ignore "deprecated"

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/138

Fix misspelling of "outstanding" ()

Copyright-paperwork-exempt: yes

* eglot.el (eglot--mode-line-format): Fix a typo.

GitHub-reference: https://github.com/joaotavora/eglot/issues/74

Handle case when project was not found in eclipse.jdt.ls contact

Override eglot-execute-command for eclipse.jdt.ls server

* eglot.el (eglot-execute-command eglot-eclipse-jdt): New defmethod.

Add support for eclipse.jdt.ls server

* eglot.el (eglot-server-programs): Add java-mode entry.
(eglot-eclipse-jdt): New class.
(eglot-initialization-options): Override for eglot-eclipse-jdt.
(eglot--eclipse-jdt-contact): New function.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/63

Allow function contacts to be interactive

* eglot.el (eglot-server-programs): Mention that the function must
  accept one argument.
(eglot--guess-contact): Pass to functional contacts the interactive
value.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/63

Improve signature help

* eglot.el (eglot--sig-info): Don't lose existing information.
  Attempt to highlight the active parameter by searching for it's
  :label in signature's :label.  Append to the result first sentence
  of signature's :documentation, if present.

Sort references and definitions by line number

* eglot.el (eglot--sort-xrefs): New function.
(xref-backend-definitions):
(xref-backend-references):
(xref-backend-apropos): Use it.

Merge pull request from mkcms/fix-diagnostics-wrong-type-argument

Handle case when diagnostic :character is out of range

GitHub-reference: https://github.com/joaotavora/eglot/issues/104

Handle case when diagnostic :character is out of range

* eglot.el (eglot-handle-notification): Don't error out when
  flymake-diag-region returns nil.

Eglot-ignored-server-capabilites: prefer all choices over "other"

Previously the "Other" choice matched every value, so it was always
shown in the customize buffer.

* eglot.el (eglot-ignored-server-capabilites): Make the "Other" choice
  the last possible option.

Make eglot-ignored-server-capabilites more user-friendly ()

* eglot.el (eglot-ignored-server-capabilites): Add list of possible
  choices to :type, along with a user-friendly description.

GitHub-reference: https://github.com/joaotavora/eglot/issues/126

Correctly map documentsymbol's :kind to its name ()

Previously we were mapping :kind in DocumentSymbol with
names from the CompletionItemKind enum, whereas we should
have used the SymbolKind enum.

* eglot.el (eglot--symbol-kind-names): New variable.
(eglot-imenu): Use it instead of eglot--kind-names.

GitHub-reference: https://github.com/joaotavora/eglot/issues/121

Autoload eglot-ensure ()

Copyright-paperwork-exempt: yes

* eglot.el (eglot-ensure): Add autoload cookie

GitHub-reference: https://github.com/joaotavora/eglot/issues/120

Don't block kill-buffer-hook if server somehow hangs

* eglot.el (eglot--signal-textDocument/didClose): Use
with-demoted-errors.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/115

Don't send other notifications before initialized

Copyright-paperwork-exempt: yes

* eglot.el (eglot--connect): send initialized before
activating minor mode.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/100

Prefer ccls over cquery for c/c++

* README.md (Installation and usage): Prefer ccls to cquery. Mention clangd.

* eglot.el (eglot-server-programs): Suggest ccls for c/c++ by default.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/94

Fix serious breakage introduced by

string-prefix-p doesn't work on symbols

* eglot.el (eglot-handle-notification): Coerce method name to string.

GitHub-reference: https://github.com/joaotavora/eglot/issues/93

Don't warn on implementation-specific notifications ()

Only warn when method name doesn't start with '$'. Per the spec:

  "if a server or client receives notifications or requests
  starting with ‘$/’ it is free to ignore them if they are unknown."

* eglot.el (eglot-handle-notification t t): Check method name for $.

GitHub-reference: https://github.com/joaotavora/eglot/issues/93

When exiting emacs, don't ask the user to confirm killing processes ()

Copyright-paperwork-exempt: yes

* eglot.el (eglot--connect, eglot--inferior-bootstrap): pass noquery t to
make-process.

GitHub-reference: https://github.com/joaotavora/eglot/issues/83

Handle case when :textdocumentsync isn't a number

Also closes https://github.com/joaotavora/eglot/issues/87.

* eglot.el (eglot--signal-textDocument/didChange): Grab :change
from :textDocumentSync server capability.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/86

Correctly delete text before expanding snippet completions

Suggested by Amol Mandhane.

* eglot.el (eglot-completion-at-point): Use length of obj in
:exit-function

GitHub-reference: close https://github.com/joaotavora/eglot/issues/82

Ignore extra keys in textdocument/publishdiagnostics ()

Accoding to the "discussion" in https://reviews.llvm.org/D50571, it
was deemed sufficient that VSCode is fine with the non-standard
extension -- jt

Copyright-paperwork-exempt: yes

* eglot.el (eglot-handle-notification): Add &allow-other-keys

GitHub-reference: https://github.com/joaotavora/eglot/issues/81

Consider :triggercharacters in company completion

* eglot.el (eglot-completion-at-point): Take advantage of
:company-prefix-length.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/80

Improve snippet support

* eglot.el (eglot-client-capabilities): Don't always declare
snippet support.
(eglot--snippet-expansion-fn): New helper.
(eglot-completion-at-point): Better annotations when snippets
are supported.

Add go-langserver ()

Copyright-paperwork-exempt: yes

* README.md (Installation and usage): Add go-langserver.
* eglot.el (eglot-server-programs): Add go-langserver.

GitHub-reference: https://github.com/joaotavora/eglot/issues/74

Don't error if server replies with empty hover message

* eglot.el (eglot-eldoc-function): Check non-nil contents.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/74

Fix textdocument/hover responses where markedstring is a plist ()

* eglot.el (eglot--hover-info): Forward all non-vector content to
eglot--format-markup.

GitHub-reference: https://github.com/joaotavora/eglot/issues/72

Support snippet completions

* eglot.el (eglot-client-capabilities): Declare support for
snippet-based completions.
(eglot-completion-at-point): Expand snippet completions with
YASnippet if that is found.
(eglot-note, eglot-warning, eglot-error): Diagnostic
overlay priorities have to be slightly lower than yasnippet's,
which must be reasonably high.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/50

Fix eglot-capabilities when querying for multiple features

* eglot-tests.el (eglot-capabilities): New test.

* eglot.el (eglot--server-capable): Fix problems with queries for
multiple capabilities.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/74

Prompt for server in interactive eglot-shutdown

* eglot.el (eglot--read-server): New helper.
(eglot-shutdown): Use it.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/73

Add kotlin-language-server ()

https://github.com/fwcd/KotlinLanguageServer

copyright-paperwork-exempt: yes

* README.md (Installation and Usage): declare Kotlin support.

GitHub-reference: https://github.com/joaotavora/eglot/issues/70

Handle edits to same position in the correct order

In eglot--apply-text-edits, the markers returned by
eglot--lsp-position-to-point are of the "stay" type, i.e. have an
insertion-type of nil.  This causes multiple insertion edits to the
same location to happen in the reverse order in which they appear in
the LSP message, which is a violation of the spec and a bug.

There are more ways to solve this (see related discuttion in
https://github.com/joaotavora/eglot/pull/64), but the easiest way is
to revert the order in which the edits are processed.  This is because
the spec tells us that the order is only relevant in precisely this
"same position" case.  So if we reverse the order we fix this bug and
don't break anything else.

* eglot.el (eglot--apply-text-edits): Apply edits in reverse..

GitHub-reference: close https://github.com/joaotavora/eglot/issues/64

Control the size of the events buffer

* eglot.el (eglot-events-buffer-size): New defcustom.
(eglot--connect): Use it.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/41

Implement asynchronous server connection

A new defcustom eglot-sync-connect controls this feature.  If it is t,
eglot should behave like previously, waiting synchronously for a
connection to be established, with the exception that there is now a
non-nil timeout set to eglot-connect-timeout, which defaults to 30
seconds.

eglot-connect is now considerably more complicated as it replicates
most of the work that jsonrpc-request does vis-a-vis handling errors,
timeouts and user quits..

* eglot-tests.el
(eglot--call-with-dirs-and-files): Simplify cleanup logic.
(slow-sync-connection-wait)
(slow-sync-connection-intime, slow-async-connection)
(slow-sync-error): New tests.

* eglot.el (eglot-sync-connect): New defcustom.
(eglot-ensure, eglot): Simplify.
(eglot--connect): Honour eglot-sync-connect.  Complicate
considerably.
(eglot-connect-timeout): New defcustom.
(Package-requires): Require jsonrpc 1.0.6

GitHub-reference: close https://github.com/joaotavora/eglot/issues/68

Kill server's output and events buffers from eglot-shutdown ()

* eglot.el
(Package-Requires): Require jsonrpc 1.0.5
(eglot-shutdown): Kill events and stderr buffers of the
server, unless new PRESERVE-BUFFERS argument is non-nil.
eglot-reconnect): Preserve buffers on shutdown.

* eglot-tests.el (eglot--call-with-dirs-and-files): Call
eglot-shutdown with non-nil PRESERVE-BUFFERS arg.

GitHub-reference: https://github.com/joaotavora/eglot/issues/66

Improve eglot-execute-command api to ease overriding by servers

* eglot.el (eglot-execute-command): COMMAND can be a symbol.
(eglot-code-actions): Pass symbols to eglot-command.

Add a generic eglot-execute-command api

* eglot.el (eglot-execute-command): New defgeneric and method.  Use it
  to request :workspace/executeCommand.
(eglot-code-actions): Use it.

* eglot.el (eglot-cquery): capitalize docstring.

* eglot.el (advice-add jsonrpc-request): add &allow-other-keys

Require jsonrpc.el 1.0.2 (gnu elpa didn't build 1.0.1)

* eglot.el (Package-Requires): Require jsonrpc 1.0.2

Snappier completions that don't hinder typing

This should improve company-capf's performance.

* eglot.el (Package-Requires): Require jsonrpc 1.0,1
(eglot-completion-at-point): Use completion-table-dynamic.  Pass
CANCEL-ON-INPUT to jsonrpc-request.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/61

Notify server of recent changes before save notification

* eglot.el (eglot--signal-textDocument/didSave): Call
  eglot--signal-textDocument/didChange.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/60

* eglot.el (eglot-initialization-options): fix spurious typo.

Accept functions as entries in eglot-server-programs

CONTACT in the (MAJOR-MODE . CONTACT) association in
eglot-server-programs can now be a function of no arguments producing
any value previously valid for contact.  The function is called at
time of `M-x eglot` or `eglot-ensure`.  This is useful for servers
requiring command-line invocations that depend on the specific
momentary environment.

* eglot.el (eglot-server-programs): CONTACT can be a fucntion of no
arguments.
(eglot--guess-contact, eglot--connect): Accept function
CONTACTs.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/63

Eglot-workspace-configuration's keys needn't be keywords

* eglot.el (eglot-signal-didChangeConfiguration): Convert
alist keys into a json-compatible plist.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/59

Default eglot-handle-notifictiona|request must &allow-other-keys

* eglot.el (eglot-handle-notification, eglot-handle-request): Add
&allow-other-keys

Fix placement of diagnostics with same start and end positions

Some servers such as cquery and clangd publish diagnostic with
identical start and end positions.

* eglot.el (eglot-handle-notification
  :textDocument/publishDiagnostics): Add 1 to :line since LSP lines
  are 0-based.  Don't subtract 1 from :character, since both emacs and
  LSP have 0-based columns.

Erase company-doc buffer in between doc requests

* eglot.el (eglot-completion-at-point): Erase temporary
"*eglot-doc*" buffer for company's doc.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/58

* eglot.el (eglot-client-capabilities): fix a typo.

Implement textdocument/rangeformatting

* eglot.el (eglot-format): New command.
(eglot-format-buffer): Use it as implementation.
(eglot-client-capabilities): Add :rangeFormatting.
* eglot-tests.el (formatting): Also test range formatting.
* README.md (Commands and keybindings): Mention eglot-format.
(Language features): Tick textDocument/rangeFormatting.

Correctly make lsp positions in narrowed buffers

* eglot.el (eglot--pos-to-lsp-position): Fix return value when
  narrowing is in effect.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/54

Fix typo in willsavewaituntil rpc request ()

Copyright-paperwork-exempt: yes

* eglot.el (eglot--signal-textDocument/willSave): Fix typo.

GitHub-reference: https://github.com/joaotavora/eglot/issues/51

Work around emacs bugs 32237, 32278 ()

See:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32237
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32278

* eglot.el (eglot--apply-text-edits): Inhibit modification hooks and
  call them manually for the changed region.

GitHub-reference: https://github.com/joaotavora/eglot/issues/53

Be less verbose when using eglot-ensure

* eglot.el (eglot-ensure): Don't message when a buffer is already
managed.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/48

Add entry for haskell-ide-engine in eglot-server-programs ()

* eglot.el (eglot-server-programs): Add entry for haskell-mode

GitHub-reference: https://github.com/joaotavora/eglot/issues/49

Fix messages of eglot-ensure

* eglot.el (eglot-ensure): fix messages.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/48

Don't turn on flymake-mode any more than is needed

If flymake-mode is in eglot--managed-mode-hook, it will be called even
if eglot--managed-mode is being turned off, which could be problematic
because it triggers a check if flymake-start-on-flymake-mode is t.

* eglot.el (eglot--managed-mode): Turn on flymake-mode and
eldoc-mode here.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/44

Robustify in the face of manual mode changes

When manually changing the major-mode of a managed buffer, this sends
a didClose and tears down Eglot-related stuff like if were killing the
buffer.  After changing the mode, we have to recheck that we are now
not managed by another server (or by the same server, in case we
changed the mode to be the same mode).

* eglot.el (eglot-shutdown): Use eglot--with-live-buffer
(eglot--on-shutdown): Use eglot--with-live-buffer
(eglot--managed-mode): Use change-major-mode-hook.
(eglot--managed-mode-onoff): Change protocol. Turn off when called
with no arguments.
(eglot--maybe-activate-editing-mode): Don't do anything if mode is
already active.  Suitable for calling from
after-change-major-mode-hook.
(after-change-major-mode-hook): Add
eglot--maybe-activate-editing-mode.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/44

Implement workspace/didchangeconfiguration ()

* README.md (Supported Protocol Features, Commands and
keybindings): mention workspace/didChangeConfiguration.

* eglot.el (eglot-server-initialized-hook): New hook.
(eglot--connect): Run it.
(eglot-workspace-configuration): New variable.
(eglot-signal-didChangeConfiguration): New command.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/29
GitHub-reference: close https://github.com/joaotavora/eglot/issues/40

Handle experimental/unknown server methods gracefully

* eglot.el (eglot-handle-notification t t, eglot-handle-request t
t): Add default handlers for unknown methods.
(eglot-handle-notification $cquery/progress)
(eglot-handle-notification $cquery/setInactiveRegions)
(eglot-handle-notification $cquery/publishSemanticHighlighting):
Remove these no-ops.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/39

Jsonrpc.el is now a gnu elpa depedency

* Makefile (ELFILES): Don't include jsonrpc.
(jsonrpc-check): Remove target.
(check): Don't run jsonrpc-check

* README.md (either): Mention "packaged in a single file" again

* eglot.el (Package-Requires): Require jsonrpc 1.0.0
(Version): Bump to 1.1

* jsonrpc.el: Remove

* jsonrpc-tests.el: Remove

* eglot.el (eglot-completion-at-point): fix broken indentation

Format documentation in completion annotations

Fixes an issue with the latest RLS, where the server returns a plist
instead of a plain string as documentation for completion candidates,
which broke the `annotation-function`. This change was introduced by
https://github.com/rust-lang-nursery/rls/commit/206a9fb41e837333d0e67187a6a9fe24868b77a4

Copyright-paperwork-exempt: yes

* eglot.el (eglot-completion-at-point): Use eglot--format-markup

Unbreak completion when no possible annotation

* eglot.el (eglot-completion-at-point): Handle case where no doc,
detail or kind.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/37

Handle outrageously large and buggy line numbers

* eglot.el (eglot--lsp-position-to-point): Truncate line number to
most-positive-fixnum.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/34

Inhibit auto-reconnect until connection is established

Otherwise, a server that crashes on startup is enough to throw Eglot
into a reconnection infloop.

* eglot.el (eglot-lsp-server): Initialize "inhibit-autoreconnect"
slot to t.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/36

Bind default-directory when launching servers

Apparently, not doing so trips some servers, like Scala's.

* eglot.el (eglot--connect): Bind default-directory.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/33

Cache buffer's managing server

* eglot.el (eglot--cached-current-server): New variable.
(eglot--managed-mode-onoff): Set it.
(eglot--current-server): Read it.
(eglot--maybe-activate-editing-mode): Add assertion.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/32

Unbreak imenu for cquery servers (and probably more)

* eglot.el (eglot-imenu): Don't try to make a group for symbols
without kind.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/31

Unbreak basic imenu functionality

* eglot.el (eglot--managed-mode): Add missing quote to
imenu-create-index-function.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/31

Fix typo in the solargraph server program

Copyright-paperwork-exempt: yes

* eglot.el (eglot-server-programs): Fix typo.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/30

Fix some rather silly bugs in some interactive specs

* eglot.el (eglot-events-buffer, eglot-stderr-buffer)
(eglot-forget-pending-continuations): Fix interactive specs.

Implement tcp autostart/autoconnect (and support ruby's solargraph)

* README.md (Installation and usage): Mention support for
Solargraph
(Connecting via TCP): New section
(Connecting automatically): New section

* eglot.el (eglot-server-programs): Add ruby-mode.
Overhaul docstring.
(eglot-lsp-server): Add inferior-process slot.
(eglot--on-shutdown): Kill any autostarted inferior-process
(eglot--guess-contact): Allow prompting with :autoport parameter.
(eglot--connect): Consider :autoport case.
(eglot--inferior-bootstrap): New helper.

Merge branch 'jsonrpc-refactor', bump version to 1.0

* eglot.el (Version): Bump to 1.0

* eglot.el (version): bump to 0.11

Merge master into jsonrpc-refactor (using imerge)

Empty ranges are valid in lsp

The previous hack in eglot--range-region, designed to appease cquery's
occasional practice of publishing diagnostics with empty regions, was
moved to the proper notification handler.

Reported by mkcms <k.michal@zoho.com>.

* eglot.el (eglot--range-region): Allow empty ranges, which are
allowed in LSP.
(eglot-handle-notification :textDocument/publishDiagnostics): Maybe
fallback to flymake-diag-region here.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/27

Apply text edits as a single undoable edit

As suggested by mkcms <k.michal@zoho.com>, but do it in
eglot--apply-text-edits, where it benefits all its users.

Also, just using undo-boundary is not enough, one needs
undo-amalgamate-change-group to mess with the boundaries already in
buffer-undo-list.

* eglot.el (eglot--apply-text-edits): Use
  undo-amalgamate-change-group.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/22

Report progress when applying edits

Use make-progress-reporter in eglot--apply-text-edits

As suggested by mkcms <k.michal@zoho.com>, but do it in
eglot--apply-text-edits, where it benefits all its users.

* eglot.el (eglot--apply-text-edits): Use a progress reporter.
Fix marker point recovery.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/23

Apply text edits atomically

As suggested by mkcms <k.michal@zoho.com>, but do it in
eglot--apply-text-edits, where it benefits all its users.

* eglot.el (eglot--apply-text-edits): Use atomic-change-group.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/22

Defer textdocument/formatting requests

* eglot.el (eglot-format-buffer): Pass DEFERRED to eglot--request.

Simplify eglot-format-buffer

Use replace-buffer-contents, as suggested by mkcms
<k.michal@zoho.com>, but do it in eglot--apply-text-edits, where it
benefits all its users.

* README.md (Commands and keybindings): Mention
eglot-format-buffer.

* eglot.el (eglot-format-buffer): Don't try to heuristically
preserve point here.
(eglot--apply-text-edits): Use replace-buffer-contents.

* eglot-tests.el (formatting): adjust test to strictly check for point
position.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/22

Guess server for js2-mode and rjsx-mode

* eglot.el (eglot-server-programs): Add entries for js2-mode and
rjsx-mode.  Coalesce entries for c++ and c-mode.  Improve
docstring.
(eglot--guess-contact): Allow lists are keys in
eglot-server-programs.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/26

Improve eglot-ensure and mention it in readme.md

* README.md (Installation and Usage): Mention eglot-ensure.

* eglot.el (eglot-ensure): No-op for non-file buffers.
(eglot--connect): Don't fallback to 'eglot-lsp-server here.
(eglot--guess-contact): Error if something can't be guessed.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/25

Use gfm-mode for formatted strings ()

* eglot.el (eglot--format-markup): Use gfm-mode instead of
markdown-mode.

Copyright-paperwork-exempt: yes
GitHub-reference: https://github.com/joaotavora/eglot/issues/20

Minor cleanup to new textdocument/formatting feature

* README.md (Language feature): Tick textDocument/formatting

* eglot.el (eglot-client-capabilities): Add formatting capability.
Also move codeAction capability to the correct section.

(eglot-format-buffer): Remove unused lexical variable before-point.

Implement formatting ()

Implement textDocument/formatting

* eglot.el (eglot-format-buffer): New command to format
current buffer.

* eglot-tests.el (formatting): New test.

GitHub-reference: https://github.com/joaotavora/eglot/issues/19

* eglot.el (version): bump to 0.10