Handle (un)registercapability requests via generic functions

* eglot.el (Version): Bump to 1.4
(eglot-register-capability, eglot-unregister-capability): New
generic functions.
(eglot--register-unregister): Call eglot-register-capability,
eglot-unregister-capability.
(eglot-register-capability s (eql
workspace/didChangeWatchedFiles)): Rename from
eglot--register-workspace/didChangeWatchedFiles.
(eglot-unregister-capability s (eql
workspace/didChangeWatchedFiles)): Rename from
eglot--unregister-workspace/didChangeWatchedFiles.

Appease checkdoc

* eglot.el (eglot--post-self-insert-hook)
(eglot--pre-command-hook, eglot--before-change)
(eglot--eclipse-jdt-contact): Fix docstrings.

* eglot.el (eglot-workspace-configuration): safe when listp.

Run connection hooks with proper dir-locals

eglot-connect-hook and eglot-server-initialized-hook must run in a
buffer with properly setup directory-local variables for the project.

This is crucial for things like eglot-signal-didChangeConfiguration,
which needs a properly setup value of eglot-workspace-configuration to
succeed.

I could have chosen any of the buffers where Eglot is activating
itself, but the approach using
hack-dir-local-variables-non-file-buffer seems more correct, despite
the name.

* eglot.el (eglot--connect): Run connection hooks with proper
dir-locals.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/196

Allow read-only modes for markup rendering

gfm-mode is read-only, so it must be set after the string has been
inserted in the temporary buffer.

* eglot.el (eglot--format-markup): Insert string before setting
mode.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/197

Remove a hard dependency on flymake-mode

* eglot.el (eglot-handle-notification): Don't specifically check for
flymake-mode before reporting diagnostics.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/195

Slightly simplify eglot-completion-at-point

* eglot.el (eglot-completion-at-point): Don't propertize
completion string with all LSP properties.

Actually make completion sorting work

* eglot.el (eglot-completion-at-point): Complicate severely.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/190

Fix previous commit where workaround had been removed

Do remove the workaround, but not more than that.

* eglot.el (eglot-completion-at-point): set local var strings.

Use gfm-view-mode

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

GitHub-reference: per https://github.com/joaotavora/eglot/issues/188

Remove workaround for company bug that has been fixed

See https://github.com/company-mode/company-mode/pull/845.

* eglot.el (eglot-completion-at-point): Remove workaround for
company-mode bug.

* eglot.el (package-requires): require jsonrpc 1.0.7.

Take over flymake and eldoc completely while managing buffers

Take a pragmatic approach and override all other Flymake and Eglot
backends while Eglot is enabled.  Restore previous values after
eglot-shutdown.

Certainly cases might arise where using more than one datasource
besides LSP while Eglot is managing the buffer is useful.  But
currently contrary, it confuses users enabling Eglot in buffers that
already have flymake/eldoc backends configured.

The reasons are slightly different for Eldoc and Flymake:

- For Eldoc the :before-until strategy only makes sense for
  synchronous backends, which Eglot isn't.  This conflicts with
  python.el default python-eldoc-function, which is also asynchronous.

- For Flymake, the default backends in Emacs (python-mode, c-mode, and
  a few others) are mainly repetitions of what LSP does.  The global
  value is still run though (in case you want to put, say, a
  spell-checking backend there).

* eglot.el (eglot--saved-bindings, eglot--setq-saving): New
helpers.
(eglot--managed-mode): Use them.

Be more careful when making xref summaries

* eglot.el (eglot--xref-make): Only highlight to end-of-line at
most.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/187

Don't make bogus responses to client/(un)registercapability

* eglot.el (eglot--register-unregister): Response is void.

Add edebug specs to destructuring macros

* eglot.el (eglot--dbind, eglot--lambda, eglot--dcase): Add edebug
specs.

Rewrite eglot--sig-info a bit for readability

* eglot.el (eglot--sig-info): Rewrite a bit.

Adjust active param highlighting in first line of signature (3/3)

Highlight only first active parameter match (even if there are many)

Copyright-paperwork-exempt: yes

* eglot.el (eglot--sig-info): Simplify.

Adjust active param highlighting in first line of signature (2/3)

Use regex with word boundaries when scanning for active param, to
avoid matching substrings.

Copyright-paperwork-exempt: yes

* eglot.el (eglot--sig-info): Use `re-search-forward`.

Adjust active param highlighting in first line of signature (1/3)

JT@2018/12/16: Previously, the whole first line of the rendered
documentation was searched for, potentially highlighting params
in the wrong place.

Copyright-paperwork-exempt: yes

* eglot.el (eglot--sig-info): Search for active parameter within
`params-start` and `params-end`.

Apply eglot--format-markup to signature documentation

Copyright-paperwork-exempt: yes

* eglot.el (eglot--sig-info): Call eglot--format-markup on signature
  documentation.

* eglot.el (version): bump to 1.3

Be lenient by default to unknown methods or notifications

* eglot.el (eglot-strict-mode): Describe meaning of
disallow-non-standard-keys.
(eglot-handle-notification, eglot-handle-request): Check
eglot-strict-mode.

Handle array params to server notification or requests

* eglot.el (eglot-handle-notification): Remove extraneous id
(eglot--connect): If params is an array, make it a list.

Scratch/use elpa flymake ()

Use GNU ELPA's Flymake

* eglot.el (Package-Requires): require Flymake 1.0.2.
(version< emacs-version "27.0"): Remove horrible hack

* Makefile (ELPADEPS): Renamed from JSONRPC.
(%.elc): Use it.
(eglot-check): Use it.

GitHub-reference: https://github.com/joaotavora/eglot/issues/178

Warn about suspicious interface usage at compile-time

For fun, set eglot-strict-mode to '(disallow-non-standard-keys
enforce-required-keys enforce-optional-keys) when compiling, or just
use flymake-mode in eglot.el.

* eglot.el (eglot--lsp-interface-alist): Use in compile-time.
Order alphabetically.  Fix a few bugs.
(eglot-strict-mode): Disallow non-standard-keys when compiling.
Update docstring.
(eglot--keywordize-vars, eglot--check-interface): New
compile-time-helpers.
(eglot--dbind, eglot--dcase): Use new helpers.

Use eglot--dbind and eglot--lambda throughout

The default behaviour of these macros is to be lenient towards servers
sending unknown keys, which should fix the issue.

* eglot.el (eglot--lsp-interface-alist): Add a bunch of new interfaces.
(eglot--connect, eglot-handle-notification)
(xref-backend-identifier-completion-table)
(xref-backend-definitions, xref-backend-apropos)
(xref-backend-references, eglot-completion-at-point)
(eglot--sig-info, eglot-help-at-point, eglot-eldoc-function)
(eglot-imenu, eglot--apply-text-edits)
(eglot--apply-workspace-edit)
(eglot--register-workspace/didChangeWatchedFiles): Use
eglot--dbind and eglot--lambda to destructure LSP objects.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/144

Adjust previous fix

* eglot.el (eglot--before-change): Don't reset
eglot--last-inserted-char here.
(eglot--pre-command-hook): Do it here.
(eglot--managed-mode): Add/remove eglot--pre-command-hook to/from
pre-command-hook.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/173

Fix bug introduced by previous fix

* eglot.el (eglot--CompletionParams): Don't use last-input-event.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/173

Handle codeaction/command polymorphism with eglot--dcase

* eglot-tests.el (eglot-dcase): Augment test.

* eglot.el (eglot--lsp-interface-alist): Add Command interface.
(eglot--dcase): Fix indentation.  When given interface, always
assume strict mode.
(eglot-code-actions): Use eglot--dcase.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/164

Robustify previous fix against non-standard insertion bindings

* eglot.el (eglot--managed-mode): Manage post-self-insert-hook.
(eglot--last-inserted-char): New variable.
(eglot--post-self-insert-hook): Set it.
(eglot--before-change): Reset it.
(eglot--CompletionParams): Use it.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/173

Properly clear old diagnostics when making new ones

* eglot.el (eglot-handle-notification
  textDocument/publishDiagnostics): Call flymake report function with
  :region.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/159

Use javascript-typescript-langserver for typescript-mode ()

Copyright-paperwork-exempt: Yes

* eglot.el (eglot-server-programs): add typescript-mode to
  javascript-typescript-langserver's contact

GitHub-reference: https://github.com/joaotavora/eglot/issues/174

Support completioncontext to help servers like ccls

* eglot.el (eglot-client-capabilities): Annouce
textDocument/completion/contextSupport.
(eglot--CompletionParams): New helper.
(eglot-completion-at-point): Use it.

GitHub-reference: close https://github.com/joaotavora/eglot/issues/173

Don't break in indirect buffers

Indirect buffers, such as the ones created by ediff-regions-wordwise,
have eglot enabled but not buffer-file-name.  Resort to the finding
the file-name of the original buffer for these.

* eglot.el (eglot--TextDocumentIdentifier): Work in indirect
buffers.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/116
GitHub-reference: fix https://github.com/joaotavora/eglot/issues/150

Use eglot--dbind for destructuring

* eglot.el (eglot--lsp-interface-alist): Add CodeAction,
  FileSystemWatcher, Registration, TextDocumentEdit, WorkspaceEdit.
(eglot-handle-notification): Use eglot--dbind.
(eglot--apply-workspace-edit): Use eglot--dbind and eglot--lambda.
(eglot-code-actions): Use eglot--lambda.
(eglot--register-workspace/didChangeWatchedFiles): Use eglot--lambda.

Introduce eglot--dcase

* eglot.el (eglot--dcase): New macro.

* eglot-tests.el (eglot-dcase-with-interface)
(eglot-dcase-no-interface): New tests.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/171
GitHub-reference: per https://github.com/joaotavora/eglot/issues/156

Simplify interface of eglot--dbind macro

* eglot.el (eglot--dbind): Use new interface.
(eglot--lambda): Use new eglot--dbind interface.
(eglot--lsp-interface-alist): Fix docstring.
(eglot--call-with-interface): Simplify.
(eglot--plist-keys): New helper.

* eglot-tests.el (eglot-strict-interfaces):
Add a new test clause.

Touch up last commit

* eglot.el (eglot-current-column): Rename from eglot--current-column.
(eglot-current-column-function): Use it as value and mention in docstring.
(eglot--xref-make): Use eglot-current-column.

* eglot.el (eglot--current-column): new helper.

(eglot-current-column-function): Set to eglot--current-column.
(eglot--pos-to-lsp-position): Don't bind tab-width anymore.
(eglot--xref-make): Use eglot--current-column.

Improve performance of xref summary line collection

* eglot.el (eglot--temp-location-buffers): New variable.
(eglot--handling-xrefs): New macro.
(eglot--xref-make): Use eglot--temp-location-buffers.
(xref-backend-definitions, xref-backend-references)
(xref-backend-apropos): Use eglot--handling-xrefs.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/52
GitHub-reference: per https://github.com/joaotavora/eglot/issues/127

Use entire line as xref summary when available

After an original implementation by Michael Livshin.  Also close https://github.com/joaotavora/eglot/issues/127.

* eglot.el (eglot--xref-make): Rework.
(xref-backend-definitions, xref-backend-references)
(xref-backend-apropos): Simplify call to `eglot--xref-make'.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/52

Revert "codeaction command can be a command object ()"

This reverts commit 1e7f94d75a30628be56ad00de8c6245f5f3e9fdf.

The spec doesn't define Command as implemented in the commit.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/164
GitHub-reference: fix https://github.com/joaotavora/eglot/issues/165

Codeaction command can be a command object ()

* eglot.el (eglot-code-actions): Handle case when the :command field
  is not a string.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/164
GitHub-reference: fix https://github.com/joaotavora/eglot/issues/165

Control strictness towards incoming lsp messages

A new variable, eglot-strict-mode controls whether Eglot is strict or
lax with regard to incoming LSP messages.

1. Bug reports should be tested with eglot-strict-mode set to
   '(disallow-non-standard-keys enforce-required-keys)

2. Users struggling to get non-standard servers working set this
   variable to '(), nil.  For now, by popular demand, this is the
   default value.

Note that this commit in particular introduces a new infrastructure,
but does not yet alter any code in Eglot to use it.  Neither is the
variable eglot--lsp-interface-alist populated.

* eglot-tests.el (eglot-strict-interfaces): New test.

* eglot.el (eglot--lsp-interface-alist): New variable.
(eglot-strict-mode): New variable.
(eglot--call-with-interface): New helper.
(eglot--dbind): New macro.
(eglot--lambda): New macro.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/144
GitHub-reference: per https://github.com/joaotavora/eglot/issues/156

* eglot.el (version): bump to 1.2

* eglot.el (eglot-completion-at-point): less chatter.

Correctly insert textedit-less snippets

Fixes a slight regression from https://github.com/joaotavora/eglot/issues/160.

* eglot.el (eglot-completion-at-point): When there is plain
`insertText' snippet, delete the full completion text.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/167

Fix potential security issue fontifying lsp doc

Previously, a server could mistankely or maliciously call *-mode
functions by in the response to a completion or hover request,
specifically in the :documentation field of the response.

Although there are plenty of similar avenues of attack in Emacs, it's
probably a good idea not to let LSP servers decide which functions to
call in an Emacs session running Eglot.

* eglot.el (eglot--format-markup): Call major-mode to fontify
buffer, not some dynamically constructed function name.
(eglot-completion-at-point): Ensure eglot--format-markup runs in
source buffer.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/154

Add support for r's languageserver ()

Copyright-paperwork-exempt: yes

* eglot.el (eglot-server-programs): Add R language server.
* README.md (Installation and usage): Mention it.

GitHub-reference: https://github.com/joaotavora/eglot/issues/161

Properly delete inserted text after completion

* eglot.el (eglot-completion-at-point): In :exit-function, delete only
  the region of buffer that was inserted by completion.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/160

Treat tab characters as 1 column wide in position conversion functions

Fixes https://github.com/joaotavora/eglot/issues/158.

* eglot.el (eglot--pos-to-lsp-position): Call
  eglot-current-column-function with tab-width bound to 1.
(eglot--lsp-position-to-point): Call eglot-move-to-column-function
with tab-width bound to 1.

Format documentation of signature parameters

* eglot.el (eglot--sig-info): Call `eglot--format-markup` on parameter
  :documentation.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/144

Add ability to report lsp-compliant columns

* eglot.el (eglot-current-column-function): New variable.
(eglot-lsp-abiding-column): New helper.
(eglot--pos-to-lsp-position): Use eglot-current-column-function.
(eglot-move-to-column-function): Tweak docstring.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/125

Add support for textedits in completion

* eglot.el (eglot-completion-at-point): Apply the CompletionItem's
  :textEdit and :additionalTextEdits when they're present.

Tweak solution to with a hint from fangrui song

* eglot.el (eglot-move-to-lsp-abiding-column): Simplify slightly.

GitHub-reference: https://github.com/joaotavora/eglot/issues/125

Complex completions work when chosen from *completions*

* eglot.el (eglot-completion-at-point): Make exit-function work
even if its arguments was stripped of its properties.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/148

Add ability to move to lsp-precise columns

Also close https://github.com/joaotavora/eglot/issues/125.

Idea and much of design contributed by Michał Krzywkowski
<k.michal@zoho.com>

This introduces the variable eglot-move-to-column-function.

According to the standard, LSP column/character offsets are based
on a count of UTF-16 code units, not actual visual columns.  So
when LSP says position 3 of a line containing just \"aXbc\",
where X is a multi-byte character, it actually means `b', not
`c'.  This is what the function
`eglot-move-to-lsp-abiding-column' does.

However, many servers don't follow the spec this closely, and
thus this variable should be set to `move-to-column' in buffers
managed by those servers.

* eglot.el (eglot-move-to-column-function): New variable.
(eglot-move-to-lsp-abiding-column): New function.
(eglot--lsp-position-to-point): Use eglot-move-to-column-function.

GitHub-reference: fix https://github.com/joaotavora/eglot/issues/124

Fix a bug introduced by previous bugfix

This commit fixes a bug but introduced another when completing a
symbol in xref-find-definitions.

commit ee58d92a7de1c8b1914c77177a7d5e755f1de827
Author: Michał Krzywkowski <k.michal@zoho.com>
Date:   Sun Nov 4 16:59:05 2018 +0100

* eglot.el (xref-backend-identifier-completion-table): Use vector.

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