gimp/build/windows/installer/util_uninst.isi

#if 0
[Code]
#endif

var
	asUninstInf: TArrayOfString; //uninst.inf contents (loaded at start of uninstall, executed at the end)

function SplitRegParams(const pInf: String; var oRootKey: Integer; var oKey,oValue: String): Boolean;
var	sRootKey: String;
	d: Integer;
begin
	Result := False;

	d := Pos('/',pInf);
	if d = 0 then
	begin
		DebugMsg('SplitRegParams','Malformed line (missing /): ' + pInf);
		exit;
	end;

	sRootKey := Copy(pInf,1,d - 1);
	oKey := Copy(pInf,d + 1,Length(pInf));

	if oValue <> 'nil' then
	begin
		d := RevPos('\',oKey);
		if d = 0 then
		begin
			DebugMsg('SplitRegParams','Malformed line (missing \): ' + pInf);
			exit;
		end;

		oValue := Decode(Copy(oKey,d+1,Length(oKey)));
		oKey := Copy(oKey,1,d-1);
	end;

	DebugMsg('SplitRegParams','Root: '+sRootKey+', Key:'+oKey + ', Value:'+oValue);

	case sRootKey of
	'HKCR': oRootKey := HKCR;
	'HKLM': oRootKey := HKLM;
	'HKU': oRootKey := HKU;
	'HKCU': oRootKey := HKCU;
	else
		begin
			DebugMsg('SplitRegParams','Unrecognised root key: ' + sRootKey);
			exit;
		end;
	end;

	Result := True;
end;


procedure UninstInfRegKey(const pInf: String; const pIfEmpty: Boolean);
var	sKey,sVal: String;
	iRootKey: Integer;
begin
	sVal := 'nil';
	if not SplitRegParams(pInf,iRootKey,sKey,sVal) then
		exit;

	if pIfEmpty then
	begin
		if not RegDeleteKeyIfEmpty(iRootKey,sKey) then
			DebugMsg('UninstInfRegKey','RegDeleteKeyIfEmpty failed');
	end
	else
	begin
		if not RegDeleteKeyIncludingSubkeys(iRootKey,sKey) then
			DebugMsg('UninstInfRegKey','RegDeleteKeyIncludingSubkeys failed');
	end;
end;


procedure UninstInfRegVal(const pInf: String);
var	sKey,sVal: String;
	iRootKey: Integer;
begin
	if not SplitRegParams(pInf,iRootKey,sKey,sVal) then
		exit;

	if not RegDeleteValue(iRootKey,sKey,sVal) then
		DebugMsg('UninstInfREG','RegDeleteKeyIncludingSubkeys failed');
end;


procedure UninstInfFile(const pFile: String);
begin
	DebugMsg('UninstInfFile','File: '+pFile);

	if not DeleteFile(pFile) then
		DebugMsg('UninstInfFile','DeleteFile failed');
end;


procedure UninstInfDir(const pDir: String);
begin
	DebugMsg('UninstInfDir','Dir: '+pDir);

	if not RemoveDir(pDir) then
		DebugMsg('UninstInfDir','RemoveDir failed');
end;


procedure CreateMessageForm(var frmMessage: TForm; const pMessage: String);
var lblMessage: TNewStaticText;
begin
	frmMessage := CreateCustomForm();
	with frmMessage do
	begin
		BorderStyle := bsDialog;

		ClientWidth := ScaleX(300);
		ClientHeight := ScaleY(48);

		Caption := CustomMessage('UninstallingAddOnCaption');

		Position := poScreenCenter;

		BorderIcons := [];
	end;

	lblMessage := TNewStaticText.Create(frmMessage);
	with lblMessage do
	begin
		Parent := frmMessage;
		AutoSize := True;
		Caption := pMessage;
		Top := (frmMessage.ClientHeight - Height) div 2;
		Left := (frmMessage.ClientWidth - Width) div 2;
		Visible := True;
	end;

	frmMessage.Show();

    frmMessage.Refresh();
end;


procedure UninstInfRun(const pInf: String);
var Description,Prog,Params: String;
	Split, ResultCode, Ctr: Integer;
	frmMessage: TForm;
begin
	DebugMsg('UninstInfRun',pInf);

	Split := Pos('/',pInf);
	if Split <> 0 then
	begin
		Description := Copy(pInf, 1, Split - 1);
		Prog := Copy(pInf, Split + 1, Length(pInf));
	end else
	begin
		Prog := pInf;
		Description := '';
	end;

	Split := Pos('/',Prog);
	if Split <> 0 then
	begin
		Params := Copy(Prog, Split + 1, Length(Prog));
		Prog := Copy(Prog, 1, Split - 1);
	end else
	begin
		Params := '';
	end;

	if not UninstallSilent then //can't manipulate uninstaller messages, so create a form instead
		CreateMessageForm(frmMessage,Description);

	DebugMsg('UninstInfRun','Running: ' + Prog + '; Params: ' + Params);

	if Exec(Prog,Params,'',SW_SHOW,ewWaitUntilTerminated,ResultCode) then
	begin
		DebugMsg('UninstInfRun','Exec result: ' + IntToStr(ResultCode));

		Ctr := 0;
		while FileExists(Prog) do //wait a few seconds for the uninstaller to be deleted - since this is done by a program
		begin                     //running from a temporary directory, the uninstaller we ran above will exit some time before
			Sleep(UNINSTALL_CHECK_TIME);           //it's removed from disk
			Inc(Ctr);
			if Ctr = (UNINSTALL_MAX_WAIT_TIME/UNINSTALL_CHECK_TIME) then //don't wait more than 5 seconds
				break;
		end;

	end else
		DebugMsg('UninstInfRun','Exec failed: ' + IntToStr(ResultCode) + ' (' + SysErrorMessage(ResultCode) + ')');

	if not UninstallSilent then
		frmMessage.Free();
end;

(*
uninst.inf documentation:

- Delete Registry keys (with all subkeys):
  RegKey:<RootKey>/<SubKey>
    RootKey = HKCR, HKLM, HKCU, HKU
    SubKey = subkey to delete (warning: this will delete all keys under subkey, so be very careful with it)

- Delete empty registry keys:
  RegKeyEmpty:<RootKey>/<SubKey>
    RootKey = HKCR, HKLM, HKCU, HKU
    SubKey = subkey to delete if empty

- Delete values from registry:
  RegVal:<RootKey>/<SubKey>/Value
    RootKey = HKCR, HKLM, HKCU, HKU
    SubKey = subkey to delete Value from
    Value = value to delete; \ and % must be escaped as %5c and %25

- Delete files:
  File:<Path>
    Path = full path to file

- Delete empty directories:
  Dir:<Path>

- Run program with parameters:
  Run:<description>/<path>/<params>

Directives are parsed from the end of the file backwards as the first step of uninstall.

IMPORTANT: From GIMP 2.10.12 onwards (Inno Setup 6 with support for per-user install), Registry keys referring to HKCR will be
processed by the installer as the first step of install (and the entries will be removed from uninst.inf), since file associations
code was rewritten.

*)
procedure ParseUninstInf();
var i,d: Integer;
	sWhat: String;
begin
	for i := GetArrayLength(asUninstInf) - 1 downto 0 do
	begin

		DebugMsg('ParseUninstInf',asUninstInf[i]);

		if (Length(asUninstInf[i]) = 0) or (asUninstInf[i][1] = '#') then //skip comments and empty lines
			continue;

		d := Pos(':',asUninstInf[i]);
		if d = 0 then
		begin
			DebugMsg('ParseUninstInf','Malformed line: ' + asUninstInf[i]);
			continue;
		end;

		sWhat := Copy(asUninstInf[i],d+1,Length(asUninstInf[i]));

		case Copy(asUninstInf[i],1,d) of
		'RegKey:': UninstInfRegKey(sWhat,False);
		'RegKeyEmpty:': UninstInfRegKey(sWhat,True);
		'RegVal:': UninstInfRegVal(sWhat);
		'File:': UninstInfFile(sWhat);
		'Dir:': UninstInfDir(sWhat);
		'Run:': UninstInfRun(sWhat);
		end;

	end;

end;

procedure CurUninstallStepChanged(CurStep: TUninstallStep);
begin
	DebugMsg('CurUninstallStepChanged','');
	case CurStep of
	usUninstall:
	begin
		LoadStringsFromFile(ExpandConstant('{app}\uninst\uninst.inf'),asUninstInf);
		ParseUninstInf();
	end;
	//usPostUninstall:
	end;
end;


procedure AssociationsCleanUp();
var i, d, countNew,countUI: Integer;
	asTemp, asNew: TArrayOfString;
	sKey,sVal: String;
	iRootKey: Integer;
begin
	if FileExists(ExpandConstant('{app}\uninst\uninst.inf')) then
	begin
		DebugMsg('AssociationsCleanUp','Parsing old uninst.inf');
		LoadStringsFromFile(ExpandConstant('{app}\uninst\uninst.inf'),asTemp);

		countNew := 0;
		countUI := 0;
		SetArrayLength(asNew, GetArrayLength(asTemp));
		SetArrayLength(asUninstInf, GetArrayLength(asTemp));

		for i := 0 to GetArrayLength(asTemp) - 1 do //extract associations-related entries from uninst.inf
		begin

			if (Length(asTemp[i]) = 0) or (asTemp[i][1] = '#') then //comment/empty line
			begin
				asNew[countNew] := asTemp[i];
				Inc(countNew);
				continue;
			end;

			d := Pos(':',asTemp[i]);
			if d = 0 then //something wrong, ignore
				continue;

			if Copy(asTemp[i],1,3) = 'Reg' then
			begin

				sVal := 'nil';
				if not SplitRegParams(Copy(asTemp[i], d + 1, Length(asTemp[i])),iRootKey,sKey,sVal) then
					continue; //malformed line, ignore

				if iRootKey = HKCR then //old association, prepare for cleanup
				begin
					DebugMsg('AssociationsCleanUp','Preparing for cleanup: '+asTemp[i]);
					asUninstInf[countUI] := asTemp[i];
					Inc(countUI);
					continue;
				end;

			end;

			//something else, keep for new uninst.inf
			asNew[countNew] := asTemp[i];
			Inc(countNew);

		end;

		SetArrayLength(asNew, countNew);
		SetArrayLength(asUninstInf, countUI);

		SaveStringsToUTF8File(ExpandConstant('{app}\uninst\uninst.inf'), asNew, False); //replace uninst.inf with a cleaned one

		ParseUninstInf(); //remove old associations
	end;
end;