// ----------------------------------------------------------------------------
//
// Inno Setup Ver:	5.4.2
// Script Version:	1.4.2
// Author:			Jared Breland <jbreland@legroom.net>
// Homepage:		http://www.legroom.net/software
// License:			GNU Lesser General Public License (LGPL), version 3
//						http://www.gnu.org/licenses/lgpl.html
//
// Script Function:
//	Allow modification of environmental path directly from Inno Setup installers
//
// Instructions:
//	Copy modpath.iss to the same directory as your setup script
//
//	Add this statement to your [Setup] section
//		ChangesEnvironment=true
//
//	Add this statement to your [Tasks] section
//	You can change the Description or Flags
//	You can change the Name, but it must match the ModPathName setting below
//		Name: modifypath; Description: &Add application directory to your environmental path; Flags: unchecked
//
//	Add the following to the end of your [Code] section
//	ModPathName defines the name of the task defined above
//	ModPathType defines whether the 'user' or 'system' path will be modified;
//		this will default to user if anything other than system is set
//	setArrayLength must specify the total number of dirs to be added
//	Result[0] contains first directory, Result[1] contains second, etc.
//		const
//			ModPathName = 'modifypath';
//			ModPathType = 'user';
//
//		function ModPathDir(): TArrayOfString;
//		begin
//			setArrayLength(Result, 1);
//			Result[0] := ExpandConstant('{app}');
//		end;
//		#include "modpath.iss"
// ----------------------------------------------------------------------------

procedure ModPath();
var
	oldpath:	String;
	newpath:	String;
	updatepath:	Boolean;
	pathArr:	TArrayOfString;
	aExecFile:	String;
	aExecArr:	TArrayOfString;
	i, d:		Integer;
	pathdir:	TArrayOfString;
	regroot:	Integer;
	regpath:	String;

begin
	// Get constants from main script and adjust behavior accordingly
	// ModPathType MUST be 'system' or 'user'; force 'user' if invalid
	if ModPathType = 'system' then begin
		regroot := HKEY_LOCAL_MACHINE;
		regpath := 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment';
	end else begin
		regroot := HKEY_CURRENT_USER;
		regpath := 'Environment';
	end;

	// Get array of new directories and act on each individually
	pathdir := ModPathDir();
	for d := 0 to GetArrayLength(pathdir)-1 do begin
		updatepath := true;

		// Get current path, split into an array
		RegQueryStringValue(regroot, regpath, 'Path', oldpath);
		oldpath := oldpath + ';';
		i := 0;

		while (Pos(';', oldpath) > 0) do begin
			SetArrayLength(pathArr, i+1);
			pathArr[i] := Copy(oldpath, 0, Pos(';', oldpath)-1);
			oldpath := Copy(oldpath, Pos(';', oldpath)+1, Length(oldpath));
			i := i + 1;

			// Check if current directory matches app dir
			if pathdir[d] = pathArr[i-1] then begin
				// if uninstalling, remove dir from path
				if IsUninstaller() = true then begin
					continue;
				// if installing, flag that dir already exists in path
				end else begin
					updatepath := false;
				end;
			end;

			// Add current directory to new path
			if i = 1 then begin
				newpath := pathArr[i-1];
			end else begin
				newpath := newpath + ';' + pathArr[i-1];
			end;
		end;

		// Append app dir to path if not already included
		if (IsUninstaller() = false) AND (updatepath = true) then
			newpath := newpath + ';' + pathdir[d];

		// Write new path
		RegWriteStringValue(regroot, regpath, 'Path', newpath);
	end;
end;

// Split a string into an array using passed delimeter
procedure MPExplode(var Dest: TArrayOfString; Text: String; Separator: String);
var
	i: Integer;
begin
	i := 0;
	repeat
		SetArrayLength(Dest, i+1);
		if Pos(Separator,Text) > 0 then	begin
			Dest[i] := Copy(Text, 1, Pos(Separator, Text)-1);
			Text := Copy(Text, Pos(Separator,Text) + Length(Separator), Length(Text));
			i := i + 1;
		end else begin
			 Dest[i] := Text;
			 Text := '';
		end;
	until Length(Text)=0;
end;


procedure CurStepChanged(CurStep: TSetupStep);
var
	taskname:	String;
begin
	taskname := ModPathName;
	if CurStep = ssPostInstall then
		if IsTaskSelected(taskname) then
			ModPath();
end;

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
var
	aSelectedTasks:	TArrayOfString;
	i:				Integer;
	taskname:		String;
	regpath:		String;
	regstring:		String;
	appid:			String;
begin
	// only run during actual uninstall
	if CurUninstallStep = usUninstall then begin
		// get list of selected tasks saved in registry at install time
		appid := '{#emit SetupSetting("AppId")}';
		if appid = '' then appid := '{#emit SetupSetting("AppName")}';
		regpath := ExpandConstant('Software\Microsoft\Windows\CurrentVersion\Uninstall\'+appid+'_is1');
		RegQueryStringValue(HKLM, regpath, 'Inno Setup: Selected Tasks', regstring);
		if regstring = '' then RegQueryStringValue(HKCU, regpath, 'Inno Setup: Selected Tasks', regstring);

		// check each task; if matches modpath taskname, trigger patch removal
		if regstring <> '' then begin
			taskname := ModPathName;
			MPExplode(aSelectedTasks, regstring, ',');
			if GetArrayLength(aSelectedTasks) > 0 then begin
				for i := 0 to GetArrayLength(aSelectedTasks)-1 do begin
					if comparetext(aSelectedTasks[i], taskname) = 0 then
						ModPath();
				end;
			end;
		end;
	end;
end;

function NeedRestart(): Boolean;
begin
	Result := False;
end;