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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              P R J . C O N F                             --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--            Copyright (C) 2006-2009, Free Software Foundation, Inc.       --

--                                                                          --

-- GNAT 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- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  The following package manipulates the configuration files

with Prj.Tree;

package Prj.Conf is

   type Config_File_Hook is access procedure

     (Config_File       : in out Prj.Tree.Project_Node_Id;

      Project_Node_Tree : Prj.Tree.Project_Node_Tree_Ref);

   --  Hook called after the config file has been parsed. This lets the

   --  application do last minute changes to it (GPS uses this to add the

   --  default naming schemes for instance). At that point, the config file

   --  has not been applied to the project yet. When no config file was found,

   --  and automatic generation is disabled, it is possible that Config_File

   --  is set to Empty_Node when this procedure is called. You can then decide

   --  to create a new config file if you need.

   procedure Parse_Project_And_Apply_Config

     (Main_Project               : out Prj.Project_Id;

      User_Project_Node          : out Prj.Tree.Project_Node_Id;

      Config_File_Name           : String := "";

      Autoconf_Specified         : Boolean;

      Project_File_Name          : String;

      Project_Tree               : Prj.Project_Tree_Ref;

      Project_Node_Tree          : Prj.Tree.Project_Node_Tree_Ref;

      Packages_To_Check          : String_List_Access;

      Allow_Automatic_Generation : Boolean := True;

      Automatically_Generated    : out Boolean;

      Config_File_Path           : out String_Access;

      Target_Name                : String := "";

      Normalized_Hostname        : String;

      Flags                      : Processing_Flags;

      On_Load_Config             : Config_File_Hook := null);

   --  Find the main configuration project and parse the project tree rooted at

   --  this configuration project.

   --

   --  Project_Node_Tree must have been initialized first (and possibly the

   --  value for external references and project path should also have been

   --  set).

   --

   --  If the processing fails, Main_Project is set to No_Project. If the error

   --  happend while parsing the project itself (ie creating the tree),

   --  User_Project_Node is also set to Empty_Node.

   --

   --  Autoconf_Specified indicates whether the user has specified --autoconf.

   --  If this is the case, the config file might be (re)generated, as

   --  appropriate, to match languages and target if the one specified doesn't

   --  already match.

   --

   --  Normalized_Hostname is the host on which gprbuild is returned,

   --  normalized so that we can more easily compare it with what is stored in

   --  configuration files. It is used when the target is unspecified, although

   --  we need to know the target specified by the user (Target_Name) when

   --  computing the name of the default config file that should be used.

   --

   --  If specified, On_Load_Config is called just after the config file has

   --  been created/loaded. You can then modify it before it is later applied

   --  to the project itself.

   --

   --  Any error in generating or parsing the config file is reported via the

   --  Invalid_Config exception, with an appropriate message. Any error while

   --  parsing the project file results in No_Project.

   procedure Process_Project_And_Apply_Config

     (Main_Project               : out Prj.Project_Id;

      User_Project_Node          : Prj.Tree.Project_Node_Id;

      Config_File_Name           : String := "";

      Autoconf_Specified         : Boolean;

      Project_Tree               : Prj.Project_Tree_Ref;

      Project_Node_Tree          : Prj.Tree.Project_Node_Tree_Ref;

      Packages_To_Check          : String_List_Access;

      Allow_Automatic_Generation : Boolean := True;

      Automatically_Generated    : out Boolean;

      Config_File_Path           : out String_Access;

      Target_Name                : String := "";

      Normalized_Hostname        : String;

      Flags                      : Processing_Flags;

      On_Load_Config             : Config_File_Hook := null;

      Reset_Tree                 : Boolean := True);

   --  Same as above, except the project must already have been parsed through

   --  Prj.Part.Parse, and only the processing of the project and the

   --  configuration is done at this level.

   --

   --  If Reset_Tree is true, all projects are first removed from the tree.

   --  When_No_Sources indicates what should be done when no sources are found

   --  for one of the languages of the project.

   --

   --  If Require_Sources_Other_Lang is true, then all languages must have at

   --  least one source file, or an error is reported via When_No_Sources. If

   --  it is false, this is only required for Ada (and only if it is a language

   --  of the project).

   Invalid_Config : exception;

   procedure Get_Or_Create_Configuration_File

     (Project                    : Prj.Project_Id;

      Project_Tree               : Prj.Project_Tree_Ref;

      Project_Node_Tree          : Prj.Tree.Project_Node_Tree_Ref;

      Allow_Automatic_Generation : Boolean;

      Config_File_Name           : String := "";

      Autoconf_Specified         : Boolean;

      Target_Name                : String := "";

      Normalized_Hostname        : String;

      Packages_To_Check          : String_List_Access := null;

      Config                     : out Prj.Project_Id;

      Config_File_Path           : out String_Access;

      Automatically_Generated    : out Boolean;

      Flags                      : Processing_Flags;

      On_Load_Config             : Config_File_Hook := null);

   --  Compute the name of the configuration file that should be used. If no

   --  default configuration file is found, a new one will be automatically

   --  generated if Allow_Automatic_Generation is true.

   --

   --  Any error in generating or parsing the config file is reported via the

   --  Invalid_Config exception, with an appropriate message.

   --

   --  On exit, Configuration_Project_Path is never null (if none could be

   --  found, Os.Fail was called and the program exited anyway).

   --

   --  The choice and generation of a configuration file depends on several

   --  attributes of the user's project file (given by the Project argument),

   --  e.g. list of languages that must be supported. Project must therefore

   --  have been partially processed (phase one of the processing only).

   --

   --  Config_File_Name should be set to the name of the config file specified

   --  by the user (either through gprbuild's --config or --autoconf switches).

   --  In the latter case, Autoconf_Specified should be set to true to indicate

   --  that the configuration file can be regenerated to match target and

   --  languages. This name can either be an absolute path, or the a base name

   --  that will be searched in the default config file directories (which

   --  depends on the installation path for the tools).

   --

   --  Target_Name is used to chose the configuration file that will be used

   --  from among several possibilities.

   --

   --  If a project file could be found, it is automatically parsed and

   --  processed (and Packages_To_Check is used to indicate which packages

   --  should be processed)

   procedure Apply_Config_File

     (Config_File  : Prj.Project_Id;

      Project_Tree : Prj.Project_Tree_Ref);

   --  Apply the configuration file settings to all the projects in the

   --  project tree. The Project_Tree must have been parsed first, and

   --  processed through the first phase so that all its projects are known.

   --

   --  Currently, this will add new attributes and packages in the various

   --  projects, so that when the second phase of the processing is performed

   --  these attributes are automatically taken into account.

   procedure Add_Default_GNAT_Naming_Scheme

     (Config_File  : in out Prj.Tree.Project_Node_Id;

      Project_Tree : Prj.Tree.Project_Node_Tree_Ref);

   --  A hook that will create a new config file (in memory), used for

   --  Get_Or_Create_Configuration_File and Process_Project_And_Apply_Config

   --  and add the default GNAT naming scheme to it. Nothing is done if the

   --  config_file already exists, to avoid overriding what the user might

   --  have put in there.

   --------------

   -- Runtimes --

   --------------

   procedure Set_Runtime_For (Language : Name_Id; RTS_Name : String);

   --  Specifies the runtime to use for a specific language. Most of the time

   --  this should be used for Ada, but other languages can also specify their

   --  own runtime. This is in general specified via the --RTS command line

   --  switch, and results in a specific component passed to gprconfig's

   --  --config switch then automatically generating a configuration file.

   function Runtime_Name_For (Language : Name_Id) return String;

   --  Returns the runtime name for a language. Returns an empty string if no

   --  runtime was specified for the language using option --RTS.

end Prj.Conf;