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allow ProgramPath to be overridable via an environment variable #17

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allow ProgramPath to be overridable via an environment variable #17

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20 changes: 19 additions & 1 deletion src/xeMeta.pas
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,8 @@ function StoreNodes(nodes: TDynViewNodeDatas): Cardinal;

{$region 'API functions'}
procedure InitXEdit; cdecl;
var
ProgramPath: String;
begin
// initialize variables
_store := TInterfaceList.Create;
Expand All @@ -302,8 +304,24 @@ procedure InitXEdit; cdecl;
// add welcome message
AddMessage('XEditLib v' + ProgramVersion);

// resolve program path; we allow the program path default value to be
// overridden with an `XEDITLIB_PROGRAM_PATH` environment variable. If
// not provided or value is empty, the program path will default to the
// directory of the first parameter of the command line, which is typically
// the path of the program executable
//
// overriding the program path is useful for scenarios where XEditLib.dll
// is being wrapped by an interpreted language, in which case the program
// executable may be the path to the interpreter, which can be located in
// some system folder where data files related to XEditLib.dll cannot and
// should not be expected to be located at.
ProgramPath := GetEnvironmentVariable('XEDITLIB_PROGRAM_PATH');
if ProgramPath = '' then begin
ProgramPath := ExtractFilePath(ParamStr(0));
end;

// store global values
Globals.Values['ProgramPath'] := ExtractFilePath(ParamStr(0));
Globals.Values['ProgramPath'] := ProgramPath;
Globals.Values['Version'] := ProgramVersion;
Globals.Values['FileCount'] := '0';
end;
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