Add Ada config

config.org

@@ -951,6 +951,64 @@
      (add-hook 'csharp-mode-hook #'lsp-deferred)
    #+end_src
 
+** Ada
+*** Old ada-mode
+    Unfortunately, the =ada-mode= on ELPA is hot garbage. It requires
+    a custom parser to be built from its sources, and as far as I can
+    tell it's completely broken: every version I've tried to build has
+    produced multiple compile errors.
+
+    There was a more basic =ada-mode= built in to Emacs, and
+    thankfully someone else has already done the hard work of bundling
+    that up -- [[https://tkurtbond.github.io/posts/2022/07/09/using-the-old-version-of-ada-mode-for-emacs/][Using the old version of Ada Mode for Emacs]]. They've
+    provided a ZIP file with all the neccessary files bundled into it,
+    which can be grabbed with the following:
+
+    #+begin_src shell
+      cd ~/Downloads
+      curl -LO https://tkurtbond.github.io/emacs/old-ada-mode.zip
+      unzip -d ~/.emacs.d old-ada-mode.zip
+    #+end_src
+
+    The directory =~/.emacs.d/ada-mode= than has to be added to
+    [[help:load-path][load-path]] and autoloaded:
+
+    #+begin_src emacs-lisp
+      (let* ((home (getenv "HOME"))
+             (path (concat home "/.emacs.d/ada-mode")))
+        (add-to-list 'load-path path))
+
+      (autoload 'ada-mode "ada-mode")
+    #+end_src
+
+*** LSP
+    =lsp-mode= with =ada_language_server= provides all the IDE-esque
+    niceties:
+
+    #+begin_src emacs-lisp
+      (add-hook 'ada-mode-hook #'lsp-deferred)
+    #+end_src
+
+    [[https://github.com/AdaCore/ada_language_server][ada_language_server]] has to be installed manually. There are linux
+    builds available on the [[https://github.com/AdaCore/ada_language_server/releases][GitHub releases page]].
+
+*** Indentation
+    Set the indent width to 4:
+
+    #+begin_src emacs-lisp
+      (setq ada-indent 4)
+    #+end_src
+
+    Ada is definitely a tabs language, if you ask me, so we want to
+    enable smart tabs. Since it's not supported out-of-the-box, Ada
+    support must be added:
+
+    #+begin_src emacs-lisp
+      (smart-tabs-add-language-support ada ada-mode-hook
+        ((ada-indent-current-function . ada-indent)
+         (ada-indent-region . ada-indent)))
+    #+end_src
+
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