--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/kotlin/name/blackcap/passman/Files.kt	Sun Sep 11 16:11:37 2022 -0700
@@ -0,0 +1,77 @@
+package name.blackcap.passman
+
+import java.io.BufferedReader
+import java.io.File
+import java.io.FileInputStream
+import java.io.InputStreamReader
+import java.nio.charset.StandardCharsets
+import java.util.*
+import kotlin.system.exitProcess
+
+/* OS Type */
+
+enum class OS {
+    MAC, UNIX, WINDOWS, OTHER;
+    companion object {
+        private val rawType = System.getProperty("os.name")?.lowercase()
+        val type = if (rawType == null) {
+            OTHER
+        } else if (rawType.contains("win")) {
+            WINDOWS
+        } else if (rawType.contains("mac")) {
+            MAC
+        } else if (rawType.contains("nix") || rawType.contains("nux") || rawType.contains("aix") || rawType.contains("sunos")) {
+            UNIX
+        } else {
+            OTHER
+        }
+    }
+}
+
+/* joins path name components to java.io.File */
+
+fun joinPath(base: String, vararg rest: String) = rest.fold(File(base), ::File)
+
+/* file names */
+
+private const val SHORTNAME = "passman"
+const val MAIN_PACKAGE = "name.blackcap." + SHORTNAME
+private val HOME = System.getenv("HOME")
+private val PF_DIR = when (OS.type) {
+    OS.MAC -> joinPath(HOME, "Library", "Application Support", MAIN_PACKAGE)
+    OS.WINDOWS -> joinPath(System.getenv("APPDATA"), MAIN_PACKAGE)
+    else -> joinPath(HOME, "." + SHORTNAME)
+}
+
+val PROP_FILE = File(PF_DIR, SHORTNAME + ".properties")
+val DB_FILE: String = File(PF_DIR, SHORTNAME + ".db").absolutePath
+
+/* make some needed directories */
+
+private fun File.makeIfNeeded() = if (exists()) { true } else { mkdirs() }
+
+/* make some usable objects */
+
+val DPROPERTIES = Properties().apply {
+    OS::class.java.getResourceAsStream("/default.properties").use { load(it) }
+}
+
+val PROPERTIES = Properties(DPROPERTIES).apply {
+    PF_DIR.makeIfNeeded()
+    PROP_FILE.createNewFile()
+    BufferedReader(InputStreamReader(FileInputStream(PROP_FILE), StandardCharsets.UTF_8)).use  {
+        load(it)
+    }
+}
+
+/* error messages */
+
+fun error(message: String) {
+    System.err.println("${SHORTNAME}: ${message}")
+}
+
+fun die(message: String, exitStatus: Int = 1) {
+    error(message)
+    exitProcess(exitStatus)
+}
+