[breaking] lang/java: rewrite & new submodules #157

Split into two submodules: +eclim & +meghanada. These must be explicitly
included in lang/java's module flags in init.el.

modules/lang/java/+eclim.el

@@ -0,0 +1,58 @@
+;;; lang/java/+eclim.el -*- lexical-binding: t; -*-
+
+;; NOTE This submodule is incomplete
+
+(def-package! eclim
+  :init
+  (add-hook 'java-mode-hook #'eclim-mode)
+  :config
+  (set! :jump 'java-mode
+    :definition #'eclim-java-find-declaration
+    :references #'eclim-java-find-references
+    :documentation #'eclim-java-show-documentation-for-current-element)
+
+  (require 'eclimd)
+  (setq help-at-pt-display-when-idle t
+        help-at-pt-timer-delay 0.1)
+  (help-at-pt-set-timer)
+
+  ;;
+  (def-menu! +java/refactor-menu
+    "Refactoring commands for `java-mode' buffers."
+    '(("Generate constructor"     :exec eclim-java-constructor)
+      ("Generate getter & setter" :exec eclim-java-generate-getter-and-setter)
+      ("Organize imports"         :exec eclim-java-import-organize)
+      ("Reformat"                 :exec eclim-java-format)
+      ("Rename symbol at point"   :exec eclim-java-refactor-rename-symbol-at-point :region nil)))
+
+  (def-menu! +java/help-menu
+    "Help and information commands for `java-mode' buffers."
+    '(("Find documentation for current element" :exec eclim-java-show-documentation-for-current-element)
+      ("Find references"     :exec eclim-java-find-references)
+      ("View call hierarchy" :exec eclim-java-call-hierarchy)
+      ("View hierarchy"      :exec eclim-java-hierarchy)
+      ("View problems"       :exec eclim-problems)))
+
+  (def-menu! +java/project-menu
+    "Building/compilation commands for `java-mode' buffers."
+    '(("Build project"  :exec eclim-project-build)
+      ("Create project" :exec eclim-project-create)
+      ("Delete project" :exec eclim-project-delete)
+      ("Go to project"  :exec eclim-project-goto)
+      ("Import project" :exec eclim-project-import)
+      ("Close project"  :exec eclim-project-close)
+      ("Open project"   :exec eclim-project-open)
+      ("Update project" :exec eclim-project-update)))
+
+  (map! :map java-mode-map
+        :localleader
+        :nv "r" #'+java/refactor-menu
+        :nv "c" #'+java/compile-menu
+        :nv "p" #'+java/project-menu))
+
+
+(def-package! company-emacs-eclim
+  :when (featurep! :completion company)
+  :after java
+  :config
+  (set! :company-backend 'java-mode '(company-emacs-eclim)))