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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;