Add IBM i as supported platform

Author: ThePrez

src/main/java/dev/dirs/BaseDirectories.java

@@ -251,6 +251,7 @@ private BaseDirectories() {
       case LIN:
       case BSD:
       case SOLARIS:
+      case IBMI:
         homeDir       = System.getProperty("user.home");
         cacheDir      = defaultIfNullOrEmpty(System.getenv("XDG_CACHE_HOME"),  homeDir, "/.cache");
         configDir     = defaultIfNullOrEmpty(System.getenv("XDG_CONFIG_HOME"), homeDir, "/.config");

src/main/java/dev/dirs/ProjectDirectories.java

@@ -234,6 +234,7 @@ public static ProjectDirectories fromPath(String path) {
       case LIN:
       case BSD:
       case SOLARIS:
+      case IBMI:
         homeDir       = System.getProperty("user.home");
         cacheDir      = defaultIfNullOrEmptyExtended(System.getenv("XDG_CACHE_HOME"),  path, homeDir + "/.cache/",       path);
         configDir     = defaultIfNullOrEmptyExtended(System.getenv("XDG_CONFIG_HOME"), path, homeDir + "/.config/",      path);

src/main/java/dev/dirs/UserDirectories.java

@@ -327,6 +327,18 @@ private UserDirectories() {
         templateDir   = null;
         videoDir      = homeDir + "/Movies";
         break;
+      case IBMI:
+        homeDir       = System.getProperty("user.home");
+        audioDir      = homeDir + "/Music";
+        desktopDir    = homeDir + "/Desktop";
+        documentDir   = homeDir + "/Documents";
+        downloadDir   = homeDir + "/Downloads";
+        fontDir       = defaultIfNullOrEmptyExtended(System.getenv("XDG_DATA_HOME"), "/fonts",  homeDir, "/.local/share/fonts");
+        pictureDir    = homeDir + "/Pictures";
+        publicDir     = homeDir + "/Public";
+        templateDir   = null;
+        videoDir      = homeDir + "/Movies";
+        break;
       case WIN:
         String[] winDirs = getWinDirs(
             "5E6C858F-0E22-4760-9AFE-EA3317B67173",

src/main/java/dev/dirs/Util.java

@@ -22,6 +22,7 @@ private Util() {
   static final char WIN = 'w';
   static final char BSD = 'b';
   static final char SOLARIS = 's';
+  static final char IBMI = 'i';
 
   static final String UTF8_BOM = "\ufeff";
 
@@ -37,6 +38,8 @@ else if (os.contains("bsd"))
       operatingSystem = BSD;
     else if (os.contains("sunos"))
       operatingSystem = SOLARIS;
+    else if (os.contains("os/400") || os.contains("os400"))
+      operatingSystem = IBMI;
     else
       throw new UnsupportedOperatingSystemException("directories are not supported on " + operatingSystemName);
   }