minimal emacs config for playing with Metals

init.el

;; defaults
(put 'dired-find-alternate-file 'disabled nil)

;; font
(set-face-attribute 'default nil :font "Iosevka SS08-14")

;; hide toolbar
(tool-bar-mode 0)

;; dark theme
(load-theme 'wombat)

;; hightlight parentheses
(show-paren-mode 1)

;; some other modes
(scroll-bar-mode 0)
(blink-cursor-mode 0)

;; hightlight current line
(global-hl-line-mode +1)
(set-face-attribute 'hl-line nil :inherit nil :background "gray17")
	  
;; ergonomic way of moving between buffers
(global-set-key (kbd "M-]") 'other-frame)
(global-set-key (kbd "M-=") 'other-window)
(global-set-key (kbd "C-M-]") 'next-buffer)
(global-set-key (kbd "C-M-[") 'previous-buffer)

;; mac os to include environment-variables from the shell
(exec-path-from-shell-initialize)
(ignore-errors ;; This package is only relevant for Mac OS X.
        (when (memq window-system '(mac ns))
          (push 'exec-path-from-shell packages)
          (push 'reveal-in-osx-finder packages)))

;; mac os pass system commands
(setq mac-pass-command-to-system t)

;; some userful packages
(require 'use-package)
(require 'auto-compile)
(require 'flycheck)
(use-package auto-compile)

;; Add melpa-stable to your packages repositories
(add-to-list 'package-archives '("melpa-stable" . "https://stable.melpa.org/packages/") t)

;; Enable ensure by default for use-package
(setq use-package-always-ensure t)

;;; Language Specific Customizations ;;;

;; Enable scala-mode and sbt-mode
(use-package scala-mode
  :interpreter
  ("scala" . scala-mode))
(use-package sbt-mode
  :commands sbt-start sbt-command
  :config
  ;; WORKAROUND: https://github.com/ensime/emacs-sbt-mode/issues/31
  ;; allows using SPACE when in the minibuffer
  (substitute-key-definition
   'minibuffer-complete-word
   'self-insert-command
   minibuffer-local-completion-map))
;;(require 'sbt-mode)

;; Enable nice rendering of diagnostics like compile errors.
(use-package flycheck
  :init (global-flycheck-mode))
(add-hook 'scala-mode-hook 'flycheck-mode)

;; Lsp-ui
(use-package lsp-ui
  :pin melpa-stable)
;;(require 'lsp-ui)

;; remaps M-. and M-? (aka M-. == go to definition, M-, go back)
(define-key lsp-ui-mode-map [remap xref-find-definitions] #'lsp-ui-peek-find-definitions)
(define-key lsp-ui-mode-map [remap xref-find-references] #'lsp-ui-peek-find-references)

;; Eglot
(use-package eglot
  :pin melpa-stable)
(add-to-list 'eglot-server-programs '(scala-mode . ("metals-emacs")))
(add-hook 'scala-mode-hook 'eglot-ensure)

;; Lsp-Mode
;;(use-package lsp-mode
;;   :pin melpa-stable)
;;(add-hook 'lsp-mode-hook 'lsp-ui-mode )
;;(require 'lsp-mode)

;; Lsp-scala
;;(add-to-list 'load-path ".emacs.d/elpa/lsp-scala")
(use-package lsp-scala
  :load-path "~/.emacs.d/elpa/lsp-scala")
(require 'lsp-scala)
(add-hook 'scala-mode-hook #'lsp-scala-enable)