feat(lsp): configure lsp-mode for Emacs

Despite all the hype around eglot, it's not working well enough for me.
I keep running into issues where the text is poorly formatted (I might
have more than one formatter running, so it could be my fault). It also
have to frequently reconnect to the server, which is really
annoying (and I did not use to have that problem with lsp-mode).

Change-Id: I5763487882599053adf9fd05c612422ad94edbe1

3 files changed, 29 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index fcc7770..be51923 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 /emacs/history
 /emacs/places
 /emacs/recentf
+/emacs/.lsp-session-v1
diff --git a/emacs/custom/my-lsp.el b/emacs/custom/my-lsp.el
new file mode 100644
index 0000000..0cb62bd
--- /dev/null
+++ b/emacs/custom/my-lsp.el
@@ -0,0 +1,27 @@
+;;; my-lsp.el --- Configures emacs for LSP -*- lexical-binding: t -*-
+;; Author: Franck Cuny <franck@fcuny.net>
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'lsp-mode)
+(require 'lsp-ui)
+
+(setq lsp-ui-doc-position 'at-point)
+(setq lsp-ui-peek-enable                t) ;; Enable `lsp-ui-peek'.
+(setq lsp-ui-peek-show-directory        t) ;; Show the directory of files.
+(setq lsp-ui-sideline-enable            t) ;; Enable `lsp-ui-sideline'.
+(setq lsp-ui-sideline-show-hover        t) ;; Show hover messages in sideline.
+(setq lsp-ui-sideline-show-code-actions t) ;; Show code actions in sideline.
+
+(setq lsp-completion-enable t) ;; Enable `completion-at-point' integration.
+
+(require 'lsp-diagnostics)
+(setq lsp-diagnostics-provider :flymake)
+
+(add-hook 'lsp-mode-hook #'lsp-ui-mode)
+
+(provide 'my-lsp)
+
+;;; my-lsp.el ends here
diff --git a/emacs/init.el b/emacs/init.el
index d23dc2d..2dcca81 100644
--- a/emacs/init.el
+++ b/emacs/init.el
@@ -50,6 +50,7 @@
 (require 'my-notmuch)
 (require 'my-elfeed)
 
+(require 'my-lsp)
 (require 'my-lang-python)
 
 (require 'my-buffers)