Initial implementaiton of Alire support.

Refs #668

Author: reznikmm

README.md

@@ -13,6 +13,7 @@ for Ada/SPARK.
 Current features:
 
 * [GNAT project files](https://docs.adacore.com/gprbuild-docs/html/gprbuild_ug/gnat_project_manager.html) support.
+* Basic [Alire](https://alire.ada.dev/) support.
 * Code completion for names, keywords, aggregates, etc.
 * Code navigation, such as Go to Definition/Declaration, Find All References, Call Hierarchies, etc.
 * [Code refactoring](#refactoring-tools) like insert named associations, auto-add `with`-clauses, etc.
@@ -126,7 +127,7 @@ formatting might no succeed on incomplete/illegal code.
 
 * **Toooling support**: we currently provide minimal support for *SPARK* (see *Prove/Examine* tasks in the [Auto-detected tasks](#auto-detected-tasks) section), but there is no support for tools such as *CodePeer*, *GNATcheck*, *GNATtest* or *GNATcoverage*.
 
-* **Project support**: there is no `Scenario` view: users should configure scenarios via the *ada.scenarioVariables* setting (see the settings list available [here](doc/refactoring_tools.md)). You can execute the *Developper: Reload Window* command to reload your project after saving the new scenario values (use the *Ctrl+P* shortcut to invoke the **Command Palette**, allowing you to execute commands).
+* **Project support**: there is no `Scenario` view: users should configure scenarios via the *ada.scenarioVariables* setting (see the settings list available [here](doc/refactoring_tools.md)). You can execute the *Ada: Reload project* command to reload your project after saving the new scenario values (use the *Ctrl+P* shortcut to invoke the **Command Palette**, allowing you to execute commands).
 
   Source directories from imported projects should be added in a [workspace file](https://code.visualstudio.com/docs/editor/workspaces#_multiroot-workspaces). If you already have a workspace file, the extension will propose you to automatically add all the source directories coming from imported projects to your workspace automatically at startup.
 
@@ -224,7 +225,9 @@ Here is an example config file from the gnatcov project:
 }
 ```
 
-## Integration with Coc.NVim
+## Integration with other editors and IDEs
+
+### Integration with Coc.NVim
 
 If you want to use the Ada Language Server with Vim/Neovim, you can use the
 [Coc.NVim](https://github.com/neoclide/coc.nvim). You'll have to
@@ -252,7 +255,7 @@ configure the Ada Language Server with `:CocConfig`:
 }
 ```
 
-## Integration with vim-lsp
+### Integration with vim-lsp
 
 If you want to integrate the Ada Language Server into vim, you can use the
 [vim-lsp](https://github.com/prabirshrestha/vim-lsp).
@@ -273,7 +276,7 @@ if executable('ada_language_server')
 endif
 ```
 
-## Integration with LanguageClient-Neovim
+### Integration with LanguageClient-Neovim
 
 If you want to integrate the Ada Language Server into Neovim, you can use the
 [LanguageClient-neovim](https://github.com/autozimu/LanguageClient-neovim).
@@ -317,7 +320,7 @@ the language server *even for files which might have nothing to do with that
 specific project*, so this needs to be taken into account. Ultimately what this
 means is that the configuration is determined by where you open vim.
 
-## Integration with Neovim's built-in LSP client
+### Integration with Neovim's built-in LSP client
 
 Neovim 0.5.0 and later have a built-in LSP client which can be used with the
 Ada Language Server. In order to use it with minimal effort, follow these steps:
@@ -391,7 +394,7 @@ for the `ada_language_server` and defines default customizable configuration
 values in the `lsp-ada` group that can be edited similarly to
 `lsp-ada-project-file` in the example above.
 
-## Integration with QtCreator
+### Integration with QtCreator
 
 Starting with version `4.9`, QtCreator supports a LSP plugin. Follow
 [the official documentation](https://doc.qt.io/qtcreator/creator-language-servers.html)

gnat/lsp_server.gpr

@@ -1,7 +1,7 @@
 ------------------------------------------------------------------------------
 --                         Language Server Protocol                         --
 --                                                                          --
---                     Copyright (C) 2018-2022, AdaCore                     --
+--                     Copyright (C) 2018-2023, AdaCore                     --
 --                                                                          --
 -- This is free software;  you can redistribute it  and/or modify it  under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -20,6 +20,7 @@ with "libadalang";
 with "lal_tools.gpr";
 with "ada_libfswatch.gpr";
 with "libgnatdoc.gpr";
+with "spawn.gpr";
 
 with "lsp";