A lightweight Ada mode for Emacs

ada-light-mode is a very light alternative to
ada-mode. It depends only on the compat
library for compatibility with older Emacs versions, and it aims to be easy to
set up, fast, and reliable.

Features

• Highlight reserved words of the language
• Identify comments and strings, so that you can use the usual commands for
  (un)commenting, as well as Emacs features for spell-checking, URL detection,
  etc.
• Imenu support for subprograms, packages, and types

You can combine ada-light-mode with the Ada language
server for more advanced
features (see below).

Language server integration

The Ada language server can
enhance ada-light-mode with LSP features like documentation lookup,
jump-to-definition, refactoring, and on-the-fly error checking. This section
documents how to set it up with eglot;
the alternative lsp-mode should work
too but will require additional work.

First, install eglot (e.g., via M-x package-install RET eglot RET) and make
sure that the ada_language_server binary is on your PATH. Then, create a
.dir-locals.el file in your project to tell the language server where to find
the Ada project definition:

;;; Directory Local Variables
;;; For more information see (info "(emacs) Directory Variables")

((ada-light-mode . ((eglot-workspace-configuration . (:ada
                                                      (:projectFile "/path/to/project.gpr"))))))

Finally, open a source file and run M-x eglot to start the language server.

The Ada language server exposes a custom command als-other-file that lets you
jump between specification and body files; use it with M-x ada-light-other-file (after starting eglot) or bind the command to a key for
easy access.

License

This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see https://www.gnu.org/licenses/.