emacs.d: initial config version

- starting init.el
  just basics (package, use-package, path-handlin)
- include my-site-start.el
  that includes site-start.d directory and imports
  all *.el files in lexical order
- functionality is imported via use-package inside
  the *.el file
  (first run: internet connection is needed to MELPA)

site-start.d/401-rust.el

@@ -0,0 +1,74 @@
+;;; 401-rust.el --- handle rust code
+
+;;; Commentary:
+;;  using rust-mode with rust-analyzer via lsp
+
+;;; Code:
+;; load rustic -> IDE like for rust
+(use-package rustic
+  :ensure t
+  :init
+  (setq rustic-lsp-server 'rust-analyzer)
+  (setq rustic-format-on-save t))
+
+;; use the lsp UI package
+(use-package lsp-ui)
+
+;; use rust-analyzer via lsp
+;; (setq lsp-rust-analyzer-server-command '("~/.cargo/bin/rust-analyzer"))
+;; (add-hook 'before-save-hook (lambda () (when (eq 'rust-mode major-mode)
+;;					   (lsp-format-buffer))))
+
+;; load the language-server-protocol (lsp)
+;; (use-package lsp-mode
+;;      :init
+;;      (add-hook 'prog-mode-hook 'lsp-mode)
+;;      :after rustic)
+
+;;      ;; :config
+;;      ;; (use-package lsp-flycheck
+;;      ;;		:ensure f ; comes with lsp-mode
+;;      ;;		:after rustic))
+
+;; (push 'rustic-clippy flycheck-checkers)
+
+;; Turn off flycheck.
+;; (remove-hook 'rustic-mode-hook 'flycheck-mode)
+
+
+;; ;; load rust-mode
+;; (use-package rust-mode
+;;     :mode "\\.rs\\'"
+;;     :init
+;;     (setq rust-format-on-save t))
+
+
+;; ;; bind the lsp-rust mode
+;; (use-package lsp-rust
+;;   :after lsp-mode)
+
+;; option: bind commands to keys:
+;;   - lsp-rust-analyzer-join-lines
+;;   - lsp-extend-selection
+;;   - lsp-rust-analyzer-expand-macro
+
+
+;; (autoload 'rust-mode "rust-mode"
+;;   "Major mode for the rust programming language" t)
+
+;; (add-hook 'rust-mode-hook #'racer-mode)
+;; (add-hook 'racer-mode-hook #'eldoc-mode)
+;; (add-hook 'racer-mode-hook #'company-mode)
+;; (add-hook 'rust-mode-hook 'cargo-minor-mode)
+;; (add-hook 'flycheck-mode #'flycheck-rust)
+;; (add-hook 'flycheck-mode-hook #'flycheck-rust-setup)
+
+;; ;; reccommended: use spaces instead of tabs
+;; (add-hook 'rust-mode-hook
+;;	  (lambda () (setq indent-tabs-mode nil)))
+
+;; ;; on save, run rustfmt if installed (C-c C-f)
+;; (setq rust-format-on-save t)
+
+(provide '401-rust)
+;;; 401-rust.el ends here