AssetPostprocessor.assetPath

Description

The path name of the asset being imported.

using UnityEngine;
using UnityEditor;

// Automatically sets Textures settings upon first import and prints the
// path from  where is being imported

class CustomImportSettings : AssetPostprocessor
{
    void OnPreprocessTexture()
    {
        Debug.Log("Importing texture to: " + assetPath);
        TextureImporter importer  = (TextureImporter)assetImporter;
        importer.textureFormat = TextureImporterFormat.ARGB32;
        importer.isReadable = true;
        importer.mipmapEnabled = false;
    }
}