/// <summary>
/// Retrieves path to the latest (highest version) R installation
/// from registry. Typically in the form 'Program Files\R\R-3.2.1'
/// Selects highest from compatible versions, not just the highest.
/// </summary>
public static string GetCompatibleEnginePathFromRegistry()
{
string[] installedEngines = GetInstalledEngineVersionsFromRegistry();
string highestVersionName = String.Empty;
Version highest = null;
foreach (string name in installedEngines)
{
// Protect from random key name format changes
if (!String.IsNullOrEmpty(name))
{
string versionString = ExtractVersionString(name);
Version v;
if (Version.TryParse(versionString, out v) && SupportedRVersionList.IsCompatibleVersion(v))
{
if (highest != null)
{
if (v > highest)
{
highest = v;
highestVersionName = name;
}
}
else
{
highest = v;
highestVersionName = name;
}
}
}
}
return(GetRVersionInstallPathFromRegistry(highestVersionName));
}
/// <summary>
/// Tries to determine R installation information. If user-specified path
/// is supplied, it is used. If not, registry is used. If nothing is found
/// in the registry, makes attempt to find compatible 64-bit installation
/// of MRO, RRO or R (in this order) in Program Files folder
/// </summary>
/// <param name="basePath">Path as specified by the user settings</param>
/// <returns></returns>
public static RInstallData GetInstallationData(string basePath, int minMajorVersion, int minMinorVersion, int maxMajorVersion, int maxMinorVersion)
{
string path = RInstallation.GetRInstallPath(basePath);
// If nothing is found, look into the file system
if (String.IsNullOrEmpty(path))
{
foreach (var f in rFolders)
{
path = TryFindRInProgramFiles(f, minMajorVersion, minMinorVersion, maxMajorVersion, maxMinorVersion);
if (!String.IsNullOrEmpty(path))
{
break;
}
}
}
// Still nothing? Fail, caller will typically display an error message.
if (String.IsNullOrEmpty(path))
{
return(new RInstallData()
{
Status = RInstallStatus.PathNotSpecified
});
}
// Now verify if files do exist and are of the correct version.
// There may be cases when R was not fully uninstalled or when
// version claimed in the registry is not what is really in files.
RInstallData data = new RInstallData()
{
Status = RInstallStatus.OK, Path = path
};
// Normalize path so it points to R root and not to bin or bin\x64
path = NormalizeRPath(path);
try {
string rDirectory = Path.Combine(path, @"bin\x64");
data.BinPath = rDirectory;
string rDllPath = Path.Combine(rDirectory, "R.dll");
string rGraphAppPath = Path.Combine(rDirectory, "Rgraphapp.dll");
string rTermPath = Path.Combine(rDirectory, "RTerm.exe");
string rScriptPath = Path.Combine(rDirectory, "RScript.exe");
string rGuiPath = Path.Combine(rDirectory, "RGui.exe");
if (FileSystem.FileExists(rDllPath) && FileSystem.FileExists(rTermPath) &&
FileSystem.FileExists(rScriptPath) && FileSystem.FileExists(rGraphAppPath) &&
FileSystem.FileExists(rGuiPath))
{
IFileVersionInfo fvi = FileSystem.GetVersionInfo(rDllPath);
int minor, revision;
GetRVersionPartsFromFileMinorVersion(fvi.FileMinorPart, out minor, out revision);
data.Version = new Version(fvi.FileMajorPart, minor, revision);
if (!SupportedRVersionList.IsCompatibleVersion(data.Version))
{
data.Status = RInstallStatus.UnsupportedVersion;
}
}
else
{
data.Status = RInstallStatus.NoRBinaries;
}
} catch (ArgumentException aex) {
data.Status = RInstallStatus.ExceptionAccessingPath;
data.Exception = aex;
} catch (IOException ioex) {
data.Status = RInstallStatus.ExceptionAccessingPath;
data.Exception = ioex;
}
return(data);
}