CodeSnip Old Code (SVN)

{
 * DataLocations.ps
 *
 * Pascal script for use in [Code] Section of CodeSnip's Install.iss.
 *
 * Gets information about location of application data folder and any existing
 * config files and databaseon on the system where CodeSnip is being installed.
 * Sets global variables storing folder paths that indicate where config files
 * and database can be found.
 *
 * $Rev$
 * $Date$
 *
 * ***** BEGIN LICENSE BLOCK *****
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The Original Code is DataLocations.ps.
 *
 * The Initial Developer of the Original Code is Peter Johnson
 * (http://www.delphidabbler.com/).
 *
 * Portions created by the Initial Developer are Copyright (C) 2008-2010 Peter
 * Johnson. All Rights Reserved.
 *
 * Contributors:
 *    NONE
 *
 * ***** END LICENSE BLOCK *****
}

{
  File locations in different CodeSnip versions
  ---------------------------------------------

  Note that the location of %AppData% varies according to the current user.
  Version numbers refer to the CodeSnip release.

  + Versions up to v1.8.11:
    - Config file: %AppData%\DelphiDabbler\CodeSnip\CodeSnip.ini
    - Main database directory: %AppData%\DelphiDabbler\CodeSnip\Data
    - No user defined database.

  + From v1.9 to v1.9.4:
    - Two config files:
      o %ProgramData%\DelphiDabbler\CodeSnip\Common.ini
      o %AppData%\DelphiDabbler\CodeSnip\User.ini
    - Main database directory:
        %ProgramData%\DelphiDabbler\CodeSnip\Data
    - No user defined database.

  + All v2 versions:
    - Two config files:
      o %ProgramData%\DelphiDabbler\CodeSnip\Common.ini
      o %AppData%\DelphiDabbler\CodeSnip\User.ini
    - Main database directory:
        %ProgramData%\DelphiDabbler\CodeSnip\Data
    - User defined database directory:
        %AppData%\DelphiDabbler\CodeSnip\UserData

  + All v3 versions:
    - Two config files:
      o %ProgramData%\DelphiDabbler\CodeSnip\Common.ini
      o %AppData%\DelphiDabbler\CodeSnip\User.3.ini
    - Main database directory:
        %ProgramData%\DelphiDabbler\CodeSnip\Data
    - User defined database directory:
        %AppData%\DelphiDabbler\CodeSnip\UserData.3

  + From v4.0:
    - Two config files:
      o %ProgramData%\DelphiDabbler\CodeSnip\Common.ini
      o %AppData%\DelphiDabbler\CodeSnip\User.4.ini
    - Main database directory:
        %ProgramData%\DelphiDabbler\CodeSnip\Data
    - User defined database directory:
        %AppData%\DelphiDabbler\CodeSnip\UserData.4
}

type

  // Different editions of program with different file locations
  TFileLocations = (
    flNone,       // CodeSnip not installed
    flOriginal,   // original locations
    flV1_9,       // v1.9 to v1.9.4
    flV2,         // all v2 versions
    flV3,         // all v3 versions
    flV4          // from v4.0
  );

var
  // Name of original user's CodeSnip data folder
  gUserAppDataDir: string;

  // Name of CodeSnip's common data folder
  gCommonAppDataDir: string;

  // Information about location of config file(s)
  gFileLocation: TFileLocations;


function MainDatabaseExists: Boolean;
  {Checks if database is installed in "new" location, i.e. under common app data
  folder.
    @return True if database is installed in new location, False if not.
  }
begin
  Result := FileExists(
    AddBackslash(gCommonAppDataDir) + 'Data\categories.ini'
  );
end;

function DataConversionRequired: Boolean;
  {Checks if database and config files need to be converted and copied to new
  location in order for installed application to use them.
    @return True if data conversion required, False if not.
  }
begin
  Result := (gFileLocation = flOriginal) or (gFileLocation = flV1_9) or
    (gFileLocation = flV2) or (gFileLocation = flV3);
end;

procedure InitAppDataFolders;
  {Records the application data folders: both common and user. The user folder
  relates to the original user. This is not necessarily the user who is
  installing the application on Vista.
  }
var
  HelperApp: string;  // name of setup helper app
  TmpDir: string;     // temp dir where helper app writes required info
  TmpFile: string;    // temp file that received helper app's info
  Res: Integer;       // return code from helper app: ignored
  UserAppDir: string; // user's application data directory
begin
  // Create name of a temporary directory in which helper app can store data
  TmpDir := ExpandConstant('{commonappdata}\DelphiDabbler\~Tmp');
  TmpFile := TmpDir + '\data';
  ForceDirectories(TmpDir);

  // Copy helper app into temp directory
  HelperApp := ExpandConstant('{#SetupHelper}');
  ExtractTemporaryFile(HelperApp);

  // Run helper app as original user. Helper app writes information relating to
  // original user to a ini file in temp directory created above.
  ExecAsOriginalUser(
    ExpandConstant('{tmp}\' + HelperApp),
    '"' + TmpFile + '"',
    '',
    SW_HIDE,
    ewWaitUntilTerminated,
    Res
  );

  // Get original user's application data directory from temp file
  UserAppDir := GetIniString('SpecialFolders', 'CSIDL_APPDATA', '', TmpFile);

  // Delete temporary directory
  DelTree(TmpDir, True, True, True);

  // Record per-user and common application data directories used by CodeSnip
  // per-user directory relates to original user.
  gUserAppDataDir := AddBackslash(UserAppDir) + 'DelphiDabbler\CodeSnip';
  gCommonAppDataDir := ExpandConstant('{commonappdata}\DelphiDabbler\CodeSnip');
end;

procedure InitDataLocations;
  {Initialises global variables that store information about location of config
  files and database.
  }
begin
  InitAppDataFolders;
  if FileExists(AddBackslash(gCommonAppDataDir) + 'Common.ini') then
  begin
    // We have CodeSnip v1.9 or later
    if FileExists(AddBackslash(gUserAppDataDir) + 'User.4.ini') then
      gFileLocation := flV4
    else if FileExists(AddBackslash(gUserAppDataDir) + 'User.3.ini') then
      // We have CodeSnip v3 or later
      gFileLocation := flV3
    else
    begin
      // We have CodeSnip v1.9 to v2.4.1
      if FileExists(
        AddBackslash(gUserAppDataDir) + 'UserData\database.xml'
      ) then
        // We have CodeSnip v2.x
        gFileLocation := flV2
      else
        // We have CodeSnip v1.9 to v1.9.4 (or v2.x with no user database)
        gFileLocation := flV1_9;
    end;
  end
  else if FileExists(AddBackslash(gUserAppDataDir) + 'CodeSnip.ini') then
    // We have up to v1.8.11
    gFileLocation := flOriginal
  else
    // We have no installation
    gFileLocation := flNone;
end;