unit ContextHelpUnit;

{$mode objfpc}
{$H+}

interface

uses
  IniFiles, Classes, SysUtils, Forms, Controls, Graphics,
  Dialogs, ExtCtrls, StdCtrls;

type

  { TContextHelpForm }

  TContextHelpForm = class(TForm)
    Button1: TButton;
    HelpMemo: TMemo;
    Panel1: TPanel;
    procedure Button1Click(Sender: TObject);
  private
  public
    procedure HelpMessage(ATag: integer);
  end; 

var
  ContextHelpForm: TContextHelpForm;

implementation

{$R *.lfm}

// Read string with index ATag
function ReadHlpFileTag(var ATag: Integer): string;
var
  lIniFile: TIniFile;
  lFileName, lLang: string;
begin
  lFilename := ChangeFileExt(ParamStr(0), '.hlp');

  if not FileExists(lFilename) then begin
    Result := 'No context help: unable to find helo file "' + lFilename + '"';
    exit;
  end;

  lIniFile := TIniFile.Create(lFilename);
  try
    lLang := lIniFile.ReadString('LANGUAGE', 'DEFAULT', '');
    Result := lIniFile.ReadString(lLang, IntToStr(ATag), Result);
    if Result <> '' then
      Result := StringReplace(Result, '\n', LineEnding, [rfIgnoreCase, rfReplaceAll])
    else
      Result := 'No context help found for ' + IntToStr(ATag);
  finally
    lIniFile.Free;
  end;
end;


procedure TContextHelpForm.Button1Click(Sender: TObject);
begin
  Close;
end;


procedure TContextHelpForm.HelpMessage(ATag: integer);
begin
  HelpMemo.Lines.Text := ReadHlpFileTag(ATag);
  Show;
end;


end.