Generate loadable project during alr init

src/alire/alire-directories.adb

@@ -492,7 +492,8 @@ package body Alire.Directories is
       use Ada.Directories;
       use Ada.Exceptions;
       use Ada.Strings.Unbounded;
-      procedure Free is new Ada.Unchecked_Deallocation (String, Destination);
+      procedure Free is
+        new Ada.Unchecked_Deallocation (Absolute_Path, Destination);
       Freeable : Destination := This.Enter;
    begin
       if This.Enter /= null

src/alire/alire-directories.ads

@@ -134,7 +134,7 @@ package Alire.Directories is
    --  This type simplifies staying in a folder during the life of a scope.
    --  Once the scope ends, the current folder is set back to the one it was.
 
-   type Destination is access String;
+   type Destination is access Absolute_Path;
    Stay : constant Destination;
 
    type Guard (Enter : Destination := Stay) is limited private;

src/alire/alire-lockfiles.adb

@@ -27,7 +27,7 @@ package body Alire.Lockfiles is
    -- File_Name --
    ---------------
 
-   function File_Name (Root_Dir : Any_Path) return Any_Path
+   function File_Name (Root_Dir : Absolute_Path) return Absolute_Path
    is (Root_Dir / Paths.Working_Folder_Inside_Root / Simple_Name);
 
    ---------------
@@ -57,7 +57,7 @@ package body Alire.Lockfiles is
    -- Read --
    ----------
 
-   function Read (Filename : Any_Path) return Contents is
+   function Read (Filename : Absolute_Path) return Contents is
    begin
       Trace.Debug ("Reading persistent contents from " & Filename);
 
@@ -119,7 +119,7 @@ package body Alire.Lockfiles is
    -----------
 
    procedure Write (Contents : Lockfiles.Contents;
-                    Filename : Any_Path)
+                    Filename : Absolute_Path)
    is
       use Ada.Text_IO;
       File  : File_Type;

src/alire/alire-lockfiles.ads

@@ -23,18 +23,18 @@ package Alire.Lockfiles is
    end record;
    --  Information that goes in the lockfile
 
-   function File_Name (Root_Dir : Any_Path) return Any_Path;
+   function File_Name (Root_Dir : Absolute_Path) return Absolute_Path;
    --  Return the location /path/to/crate/dir/alire.lock, filename included,
    --  given the root directory where the crate is deployed.
 
-   function Read (Filename : Any_Path) return Contents;
+   function Read (Filename : Absolute_Path) return Contents;
    --  Read contents from the given lockfile
 
    function Validity (File : Any_Path) return Validities;
    --  Check if given file is a valid lockfile
 
    procedure Write (Contents : Lockfiles.Contents;
-                    Filename : Any_Path);
+                    Filename : Absolute_Path);
    --  Write persistent contents to a file
 
    overriding

src/alire/alire-roots-optional.adb

@@ -54,7 +54,7 @@ package body Alire.Roots.Optional is
                          (R    => Releases.From_Manifest (Crate_File,
                                                           Manifest.Local,
                                                           Strict => True),
-                          Path => Ada.Directories.Full_Name (Path),
+                          Path => Directories.Current,
                           Env  => Alire.Root.Platform_Properties))
                   do
                      --  Crate loaded properly, we can return a valid root here

src/alire/alire-roots.adb

@@ -48,9 +48,17 @@ package body Alire.Roots is
          This.Set_Build_Profiles (Crate_Configuration.Last_Build_Profiles);
       end if;
 
+      --  Right after initialization, a Root may lack a solution, which is
+      --  needed for configuration generation, so ensure there is one.
+
+      if not This.Has_Lockfile then
+         This.Set (Solutions.Empty_Valid_Solution);
+      end if;
+
+      --  Proceed to load configuration, which must be complete before building
+
       This.Load_Configuration;
       This.Configuration.Ensure_Complete;
-      --  For proceeding to build, the configuration must be complete
 
       --  Ensure sources are up to date
 
@@ -1517,7 +1525,7 @@ package body Alire.Roots is
    -- Dependencies_Dir --
    ----------------------
 
-   function Dependencies_Dir (This  : in out Root) return Any_Path
+   function Dependencies_Dir (This  : in out Root) return Absolute_Path
    is (if Builds.Sandboxed_Dependencies
        then This.Cache_Dir / Paths.Deps_Folder_Inside_Cache_Folder
        else Paths.Vault.Path);
@@ -1561,7 +1569,7 @@ package body Alire.Roots is
    --------------------
 
    procedure Write_Solution (Solution : Solutions.Solution;
-                             Lockfile : String)
+                             Lockfile : Absolute_Path)
    is
    begin
       Lockfiles.Write (Contents => (Solution => Solution),

src/alire/alire-roots.ads

@@ -347,7 +347,7 @@ package Alire.Roots is
    function Cache_Dir (This : Root) return Absolute_Path;
    --  The "alire/cache" dir inside the root path, containing releases and pins
 
-   function Dependencies_Dir (This  : in out Root) return Any_Path;
+   function Dependencies_Dir (This  : in out Root) return Absolute_Path;
    --  The path at which dependencies are deployed, which will
    --  be either Paths.Vault.Path if dependencies are shared, or
    --  <workspace>/alire/cache/dependencies when dependencies are
@@ -368,11 +368,11 @@ private
    --  Force loading of the configuration; useful since the auto-load is not
    --  triggered when doing This.Configuration here.
 
-   function Load_Solution (Lockfile : String) return Solutions.Solution
+   function Load_Solution (Lockfile : Absolute_Path) return Solutions.Solution
    is (Lockfiles.Read (Lockfile).Solution);
 
    procedure Write_Solution (Solution : Solutions.Solution;
-                             Lockfile : String);
+                             Lockfile : Absolute_Path);
    --  Wrapper for use with Cached_Solutions
 
    package Cached_Solutions is new AAA.Caches.Files
@@ -408,7 +408,8 @@ private
       --  These values, if different from "", mean this is a temporary root
       Manifest        : Unbounded_Absolute_Path;
       Lockfile        : Unbounded_Absolute_Path;
-   end record;
+   end record
+     with Type_Invariant => Check_Absolute_Path (+Root.Path);
 
    overriding
    procedure Adjust (This : in out Root);

src/alr/alr-commands-init.adb

@@ -5,7 +5,9 @@ with Ada.Wide_Wide_Text_IO;
 with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
 
 with Alire.Config.Builtins;
+with Alire.Roots.Optional;
 with Alire.Utils.User_Input.Query_Config;
+
 with CLIC.User_Input;
 
 with GNATCOLL.VFS; use GNATCOLL.VFS;
@@ -325,6 +327,18 @@ package body Alr.Commands.Init is
          TIO.Put_Line (File, WW (S));
       end Put_Line;
 
+      ---------------------
+      -- Generate_Config --
+      ---------------------
+
+      procedure Generate_Config is
+         Root : constant Alire.Roots.Optional.Root :=
+                  Alire.Roots.Optional.Detect_Root (+Directory.Full_Name);
+      begin
+         Root.Value.Build_Prepare (Saved_Profiles => False,
+                                   Force_Regen    => False);
+      end Generate_Config;
+
    begin
       --  Crate dir
       Directory.Make_Dir;
@@ -343,6 +357,10 @@ package body Alr.Commands.Init is
 
       Generate_Manifest;
 
+      if not Cmd.No_Skel then
+         Generate_Config;
+      end if;
+
       Alire.Put_Success (TTY.Emph (Lower_Name) & " initialized successfully.");
    end Generate;
 

testsuite/tests/workflows/init-options/test.py

@@ -15,10 +15,22 @@
             complain_on_error=False)
 assert_match(".*Identifiers must be.*", p.out)
 
+# In the following, config files must already exist so the project is
+# immediately loadable by editors. Other artifacts under 'alire/' are created
+# during configuration generation.
+
 # Plain init
 run_alr('init', '--bin', 'xxx')
 compare(contents('xxx'), ['xxx/.gitignore',
+                          'xxx/alire',
                           'xxx/alire.toml',
+                          'xxx/alire/alire.lock',
+                          'xxx/alire/build_hash_inputs',
+                          'xxx/alire/config.toml',
+                          'xxx/config',
+                          'xxx/config/xxx_config.ads',
+                          'xxx/config/xxx_config.gpr',
+                          'xxx/config/xxx_config.h',
                           'xxx/share',
                           'xxx/share/xxx',
                           'xxx/src',
@@ -30,7 +42,15 @@
 run_alr('init', '--bin', 'aaa')
 compare(contents('aaa'), ['aaa/.gitignore',
                           'aaa/aaa.gpr',
+                          'aaa/alire',
                           'aaa/alire.toml',
+                          'aaa/alire/alire.lock',
+                          'aaa/alire/build_hash_inputs',
+                          'aaa/alire/config.toml',
+                          'aaa/config',
+                          'aaa/config/aaa_config.ads',
+                          'aaa/config/aaa_config.gpr',
+                          'aaa/config/aaa_config.h',
                           'aaa/share',
                           'aaa/share/aaa',
                           'aaa/src',
@@ -65,7 +85,15 @@
 os.chdir('zzz')
 run_alr('init', '--bin', '--in-place', 'zzz')
 compare(contents('.'), ['./.gitignore',
+                        './alire',
                         './alire.toml',
+                        './alire/alire.lock',
+                        './alire/build_hash_inputs',
+                        './alire/config.toml',
+                        './config',
+                        './config/zzz_config.ads',
+                        './config/zzz_config.gpr',
+                        './config/zzz_config.h',
                         './share',
                         './share/zzz',
                         './src',