/usr/share/ada/adainclude/gnatcoll_readline/gnatcoll-readline.adb is in libgnatcoll-readline1.7-dev 1.7gpl2015-2+b3.
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-- G N A T C O L L --
-- --
-- Copyright (C) 2012-2015, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
with Ada.Text_IO;
with Interfaces.C.Strings; use Interfaces.C.Strings;
package body GNATCOLL.Readline is
type Rl_Completion_Function is access
function (Text : Interfaces.C.Strings.chars_ptr;
Start : Integer;
Last : Integer) return Possible_Completions;
pragma Convention (C, Rl_Completion_Function);
type Rl_Compentry_Func is access
function (Text : Interfaces.C.Strings.chars_ptr;
State : Integer) return chars_ptr;
pragma Convention (C, Rl_Compentry_Func);
-- A function that returns each of the possible completions for
-- Text. On the first call, STATE is set to 0, and then is non-zero.
-- This function should return Null_Ptr when there are no more matches.
function Rl_Completion_Matches
(Text : chars_ptr;
Generator : Rl_Compentry_Func) return Possible_Completions;
pragma Import (C, Rl_Completion_Matches, "rl_completion_matches");
-- Returns an array of strings which is a list of completions for
-- TEXT. If there are no completions, returns NULL.
-- GENERATOR is a function that returns all possible completions, in
-- turn.
procedure Using_History;
pragma Import (C, Using_History, "using_history");
-- Enables support for history.
procedure Read_History (filename : chars_ptr);
pragma Import (C, Read_History, "read_history");
-- Reads the history from a file.
procedure Write_History (Filename : chars_ptr);
pragma Import (C, Write_History, "write_history");
-- Write the current history back to a file.
function C_Completer
(Text : Interfaces.C.Strings.chars_ptr;
Start : Integer;
Last : Integer) return Possible_Completions;
pragma Convention (C, C_Completer);
-- Attempt to complete on the contents of TEXT. START and END bound the
-- region of rl_line_buffer that contains the word to complete. TEXT is
-- the word to complete. We can use the entire contents of rl_line_buffer
-- in case we want to do some simple parsing. Return the array of matches,
-- or NULL if there aren't any.
Rl_Line_Buffer : chars_ptr;
pragma Import (C, Rl_Line_Buffer, "rl_line_buffer");
-- The line gathered so far by readline.
Rl_Readline_Name : Interfaces.C.Strings.chars_ptr;
pragma Import (C, Rl_Readline_Name, "rl_readline_name");
Rl_Attempted_Completion_Function : Rl_Completion_Function;
pragma Import (C, Rl_Attempted_Completion_Function,
"rl_attempted_completion_function");
-- A pointer to an alternative function to create matches.
Ada_Completer : Completer_Function;
----------------
-- Initialize --
----------------
procedure Initialize
(Appname : String := "";
History_File : String := "";
Completer : Completer_Function := null)
is
Tmp : chars_ptr;
begin
if Appname /= "" then
Rl_Readline_Name := New_String (Appname);
end if;
if Completer /= null then
Rl_Attempted_Completion_Function := C_Completer'Access;
Ada_Completer := Completer;
end if;
Using_History;
if History_File /= "" then
Tmp := New_String (History_File);
Read_History (Tmp);
Free (Tmp);
end if;
end Initialize;
--------------
-- Finalize --
--------------
procedure Finalize (History_File : String := "") is
Tmp : chars_ptr;
begin
if History_File /= "" then
Tmp := New_String (History_File);
Write_History (Tmp);
Free (Tmp);
end if;
end Finalize;
------------------------
-- Completion_Matches --
------------------------
function Completion_Matches
(Text : String;
Generator : Completion_Entry_Func) return Possible_Completions
is
Txt : Interfaces.C.Strings.chars_ptr := New_String (Text);
function Completion_Generator
(Txt : Interfaces.C.Strings.chars_ptr;
State : Integer) return chars_ptr;
pragma Convention (C, Completion_Generator);
-- Wrapper around the user's completion function.
--------------------------
-- Completion_Generator --
--------------------------
function Completion_Generator
(Txt : Interfaces.C.Strings.chars_ptr;
State : Integer) return chars_ptr
is
pragma Unreferenced (Txt);
Choice : constant String := Generator (Text, State);
begin
if Choice = "" then
return Null_Ptr;
else
return New_String (Choice);
end if;
end Completion_Generator;
Result : Possible_Completions;
begin
Result := Rl_Completion_Matches
(Txt, Completion_Generator'Unrestricted_Access);
Free (Txt);
return Result;
end Completion_Matches;
-----------------
-- C_Completer --
-----------------
function C_Completer
(Text : Interfaces.C.Strings.chars_ptr;
Start : Integer;
Last : Integer) return Possible_Completions
is
begin
return Ada_Completer
(Full_Line => Value (Rl_Line_Buffer),
Text => Value (Text),
Start => Start,
Last => Last);
end C_Completer;
--------------
-- Get_Line --
--------------
function Get_Line (Prompt : String := "") return String is
function Readline (Prompt : chars_ptr) return chars_ptr;
pragma Import (C, Readline, "readline");
procedure Add_History (Str : chars_ptr);
pragma Import (C, Add_History, "add_history");
Pr : chars_ptr;
Result : chars_ptr;
begin
if Prompt /= "" then
Pr := New_String (Prompt);
Result := Readline (Pr);
Free (Pr);
else
Result := Readline (Null_Ptr);
end if;
if Result /= Null_Ptr then
declare
Val : constant String := Value (Result);
begin
if Val /= "" then
Add_History (Result);
end if;
Free (Result);
return Val;
end;
else
raise Ada.Text_IO.End_Error;
end if;
end Get_Line;
end GNATCOLL.Readline;
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