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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                               G N A T K R                                --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2007, 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.      --

--                                                                          --

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

with Ada.Characters.Handling; use Ada.Characters.Handling;

with Ada.Command_Line;        use Ada.Command_Line;

with Gnatvsn;

with Krunch;

with System.IO; use System.IO;

procedure Gnatkr is

   pragma Ident (Gnatvsn.Gnat_Static_Version_String);

   Count        : Natural;

   Maxlen       : Integer;

   Exit_Program : exception;

   function Get_Maximum_File_Name_Length return Integer;

   pragma Import (C, Get_Maximum_File_Name_Length,

                 "__gnat_get_maximum_file_name_length");

begin

   Count := Argument_Count;

   if Count < 1 or else Count > 2 then

      Put_Line ("Usage: gnatkr  filename[.extension]  [krunch-count]");

      raise Exit_Program;

   else

      --  If the length (krunch-count) argument is omitted use the system

      --  default if there is one, otherwise use 8.

      if Count = 1 then

         Maxlen := Get_Maximum_File_Name_Length;

         if Maxlen = -1 then

            Maxlen := 8;

         end if;

      else

         Maxlen := 0;

         for J in Argument (2)'Range loop

            if Argument (2) (J) /= ' ' then

               if Argument (2) (J) not in '0' .. '9' then

                  Put_Line ("Illegal argument for krunch-count");

                  raise Exit_Program;

               else

                  Maxlen := Maxlen * 10 +

                    Character'Pos (Argument (2) (J)) - Character'Pos ('0');

               end if;

            end if;

         end loop;

         --  Zero means crunch only system files

         if Maxlen = 0 then

            Maxlen := Natural'Last;

         end if;

      end if;

      declare

         Fname : String  := Argument (1);

         Klen  : Natural := Fname'Length;

         Extp : Boolean := False;

         --  True if extension is present

         Ext : Natural := 0;

         --  If extension is present, points to it (init to prevent warning)

      begin

         --  Remove extension if present (an extension is defined as the

         --  section of the file name after the last dot in the name. If

         --  there is no dot in the name, then

         --  name is all lower case and contains no other instances of dots)

         for J in reverse 1 .. Klen loop

            if Fname (J) = '.' then

               Extp := True;

               Ext := J;

               Klen := J - 1;

               exit;

            end if;

         end loop;

         --  Fold to lower case and replace dots by dashes

         for J in 1 .. Klen loop

            Fname (J) := To_Lower (Fname (J));

            if Fname (J) = '.' then

               Fname (J) := '-';

            end if;

         end loop;

         Krunch (Fname, Klen, Maxlen, False);

         Put (Fname (1 .. Klen));

         if Extp then

            Put (Fname (Ext .. Fname'Length));

         end if;

         New_Line;

      end;

   end if;

   Set_Exit_Status (Success);

exception

   when Exit_Program =>

      Set_Exit_Status (Failure);

end Gnatkr;