From: Xavier Petit <xpetit@becoast.fr>
Subject: Re: Help with constructing an Ada Shell
Date: Sat, 31 Oct 2015 00:19:16 +0100
Date: 2015-10-31T00:19:16+01:00 [thread overview]
Message-ID: <5633faf4$0$3023$426a74cc@news.free.fr> (raw)
In-Reply-To: <9e1e5dc4-f5e6-4d8d-9677-1b66117d8a85@googlegroups.com>
Hello, I would suggest you to learn Ada with more easy and abstract
stuff, not shells ^^ which are platform dependent and related to the
Unix/C philosophy.
GNAT provides OS abstraction but I think that dealing with process
spawning is not the best way to learn Ada.
Here a working example of what you wanna do, based on previous answers.
(Sorry for my terrible english)
with Ada.Text_IO,
GNAT.OS_Lib;
procedure Ada_Shell is
procedure Execute_System (Command : String)
is
use GNAT.OS_Lib;
List : String_List_Access := Argument_String_To_List (Command);
Exec_Path : String_Access := Locate_Exec_On_Path (List (1).all);
Success : Boolean;
begin
if Exec_Path /= null then
Spawn (Program_Name => Exec_Path.all,
Args => List (2 .. List'Last),
Success => Success);
Free (Exec_Path);
else
Ada.Text_IO.Put_Line ("Command not found");
end if;
Free (List);
end Execute_System;
begin
Main : loop
Ada.Text_IO.Put ("ash> ");
declare
Input : constant String := Ada.Text_IO.Get_Line;
begin
exit Main when Input = "exit";
if Input'Length > 0 then
Execute_System (Command => Input);
end if;
end;
end loop Main;
exception
when Ada.Text_IO.End_Error => null; -- Handling [Ctrl]-[D]
end Ada_Shell;
--
Xavier Petit
prev parent reply other threads:[~2015-10-30 23:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-30 4:53 Help with constructing an Ada Shell annihilan
2015-10-30 8:37 ` Jacob Sparre Andersen
2015-11-03 0:47 ` Nick Gordon
2015-10-30 9:10 ` Simon Wright
2015-10-30 13:52 ` David Botton
2015-10-30 23:19 ` Xavier Petit [this message]
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