/// <summary>
/// Gets a file representing an input.
/// </summary>
/// <param name="fileSystem">The file system.</param>
/// <param name="path">
/// The path of the input file. If this is an absolute path,
/// then a file representing the specified path is returned.
/// If it's a relative path, then operations will search all
/// current input paths.
/// </param>
/// <returns>An input file.</returns>
public static IFile GetInputFile(this IReadOnlyFileSystem fileSystem, NormalizedPath path)
{
_ = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
path.ThrowIfNull(nameof(path));
if (path.IsRelative)
{
IFile notFound = null;
foreach (NormalizedPath inputPath in fileSystem.InputPaths.Reverse())
{
IFile file = fileSystem.GetFile(fileSystem.RootPath.Combine(inputPath).Combine(path));
if (notFound == null)
{
notFound = file;
}
if (file.Exists)
{
return(file);
}
}
if (notFound == null)
{
throw new InvalidOperationException("The input paths collection must have at least one path");
}
return(notFound);
}
return(fileSystem.GetFile(path));
}
/// <summary>
/// Gets a file representing a root file.
/// </summary>
/// <param name="fileSystem">The file system.</param>
/// <param name="path">
/// The path of the root file. If this is an absolute path,
/// then a file representing the specified path is returned.
/// If it's a relative path, then it will be combined with the
/// current root path.
/// </param>
/// <returns>A root file.</returns>
public static IFile GetRootFile(this IReadOnlyFileSystem fileSystem, NormalizedPath path)
{
_ = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
return(fileSystem.GetFile(fileSystem.RootPath.Combine(path)));
}