/// <summary>
/// Takes an absolute path and attempts to convert it to a relative, based on the system,
/// or global base if no system is supplied, if it is not a subfolder of the base, it will return the path unaltered
/// </summary>
public static string TryMakeRelative(this PathEntryCollection collection, string absolutePath, string system = null)
{
var parentPath = string.IsNullOrWhiteSpace(system)
? collection.GlobalBaseAbsolutePath()
: collection.AbsolutePathFor(collection.BaseFor(system), system);
#if true
if (!absolutePath.IsSubfolderOf(parentPath))
{
return(absolutePath);
}
return(OSTailoredCode.IsUnixHost
? "./" + OSTailoredCode.SimpleSubshell("realpath", $"--relative-to=\"{parentPath}\" \"{absolutePath}\"", $"invalid path {absolutePath} or missing realpath binary")
: absolutePath.Replace(parentPath, "."));
#else // written for Unix port but may be useful for .NET Core
if (!IsSubfolder(parentPath, absolutePath))
{
return(OSTailoredCode.IsUnixHost && parentPath.TrimEnd('.') == $"{absolutePath}/" ? "." : absolutePath);
}
return(OSTailoredCode.IsUnixHost
? absolutePath.Replace(parentPath.TrimEnd('.'), "./")
: absolutePath.Replace(parentPath, "."));
#endif
}
private static string AbsolutePathForInner(this PathEntryCollection collection, string path, string systemId)
{
// Hack
if (systemId == "Global")
{
systemId = null;
}
// This function translates relative path and special identifiers in absolute paths
if (path.Length < 1)
{
return(collection.GlobalBaseAbsolutePath());
}
if (path == "%recent%")
{
return(Environment.SpecialFolder.Recent.ToString());
}
if (path.StartsWith("%exe%"))
{
return(PathUtils.ExeDirectoryPath + path.Substring(5));
}
if (path.StartsWith("%rom%"))
{
return(collection.LastRomPath + path.Substring(5));
}
if (path[0] == '.')
{
if (!string.IsNullOrWhiteSpace(systemId))
{
path = path.Remove(0, 1);
path = path.Insert(0, collection.BaseFor(systemId));
}
if (path.Length == 1)
{
return(collection.GlobalBaseAbsolutePath());
}
if (path[0] == '.')
{
path = path.Remove(0, 1);
path = path.Insert(0, collection.GlobalBaseAbsolutePath());
}
return(path);
}
if (Path.IsPathRooted(path))
{
return(path);
}
//handling of initial .. was removed (Path.GetFullPath can handle it)
//handling of file:// or file:\\ was removed (can Path.GetFullPath handle it? not sure)
// all bad paths default to EXE
return(PathUtils.ExeDirectoryPath);
}
/// <summary>
/// Takes an absolute path and attempts to convert it to a relative, based on the system,
/// or global base if no system is supplied, if it is not a subfolder of the base, it will return the path unaltered
/// </summary>
public static string TryMakeRelative(this PathEntryCollection collection, string absolutePath, string system = null) => absolutePath.MakeRelativeTo(
string.IsNullOrWhiteSpace(system)
? collection.GlobalBaseAbsolutePath()
: collection.AbsolutePathFor(collection.BaseFor(system), system)
);
