diff --git a/src/cli.cr b/src/cli.cr
index 844fa91..327fc92 100644
--- a/src/cli.cr
+++ b/src/cli.cr
@@ -38,6 +38,11 @@ module GX
           @config.verbose = true
         end
 
+        parser.on("-o", "--open", "Automatically open directory after mount") do |flag|
+          Log.info { "Auto-open enabled" }
+          @config.auto_open = true
+        end
+
         parser.on("--version", "Show version") do |flag|
           @config.mode = Config::Mode::ShowVersion
         end
@@ -93,10 +98,56 @@ module GX
       when Config::Mode::Mount
         @config.load_from_file
         filesystem = choose_filesystem
-        mount_or_umount(filesystem) if !filesystem.nil?
+        raise Models::InvalidFilesystemError.new("Invalid filesystem") if filesystem.nil?
+
+        mount_or_umount(filesystem)
+        auto_open(filesystem) if @config.auto_open
       end
     end
 
+    def auto_open(filesystem)
+      # FIXME: support xdg-open
+      # FIXME: support mailcap
+      # FIXME: support user-defined command
+      # FIXME: detect graphical environment
+      
+      mount_point_safe = filesystem.mount_point
+      raise Models::InvalidMountpointError.new("Invalid filesystem") if mount_point_safe.nil?
+
+      if graphical_environment?
+        process = Process.new(
+          "xdg-open",  ## FIXME: make configurable
+          [mount_point_safe],
+          input: STDIN, 
+          output: STDOUT, 
+          error: STDERR
+        )
+        unless process.wait.success?
+          puts "Error opening filesystem".colorize(:red)
+          return
+        end
+      else
+        process = Process.new(
+          "vifm",  ## FIXME: make configurable
+          [mount_point_safe],
+          input: STDIN, 
+          output: STDOUT, 
+          error: STDERR
+        )
+        unless process.wait.success?
+          puts "Error opening filesystem".colorize(:red)
+          return
+        end
+      end
+    end
+
+    def graphical_environment?
+      if ENV["DISPLAY"]? || ENV["WAYLAND_DISPLAY"]?
+        return true
+      end
+      return false
+    end
+
     def choose_filesystem()
       names_display = {} of String => NamedTuple(filesystem: Models::AbstractFilesystemConfig, ansi_name: String)
 
@@ -134,9 +185,6 @@ module GX
     end
 
     def mount_or_umount(selected_filesystem)
-      config_root_safe = @config.root
-      return if config_root_safe.nil?
-
       if !selected_filesystem.mounted?
         selected_filesystem.mount()
       else
diff --git a/src/config.cr b/src/config.cr
index c936b77..9d81936 100644
--- a/src/config.cr
+++ b/src/config.cr
@@ -11,6 +11,9 @@ module GX
   class Config
     Log = ::Log.for("config")
 
+    class MissingFileError < Exception
+    end
+
     enum Mode
       ConfigAdd
       ConfigDelete
@@ -31,14 +34,15 @@ module GX
     property mode : Mode
     property path : String?
     property args : AddArgs.class | DelArgs.class | NoArgs.class
+    property auto_open : Bool
 
     def initialize()
-      if !ENV["HOME"]?
-        raise "Home directory not found"
-      end
+      raise Models::InvalidEnvironmentError.new("Home directory not found") if !ENV["HOME"]?
       @home_dir = ENV["HOME"]
 
       @verbose = false
+      @auto_open = false
+
       @mode = Mode::Mount
       @filesystems = [] of Models::AbstractFilesystemConfig
       @path = nil
@@ -66,7 +70,7 @@ module GX
       end
 
       Log.error { "No configuration file found in any of the standard locations" }
-      raise "Configuration file not found"
+      raise MissingFileError.new("Configuration file not found")
     end
 
     def load_from_file
@@ -87,7 +91,7 @@ module GX
       root = Models::RootConfig.from_yaml(file_patched)
 
       global_mount_point = root.global.mount_point
-      raise "Invalid global mount point" if global_mount_point.nil?
+      raise Models::InvalidMountpointError.new("Invalid global mount point") if global_mount_point.nil?
 
       root.filesystems.each do |selected_filesystem|
         if !selected_filesystem.mount_point?
diff --git a/src/models/abstract_filesystem_config.cr b/src/models/abstract_filesystem_config.cr
index d1006d8..afa55bf 100644
--- a/src/models/abstract_filesystem_config.cr
+++ b/src/models/abstract_filesystem_config.cr
@@ -6,6 +6,12 @@
 require "yaml"
 
 module GX::Models
+  class InvalidFilesystemError < Exception
+  end
+
+  class InvalidMountpointError < Exception
+  end
+
   abstract class AbstractFilesystemConfig
     include YAML::Serializable
     # include YAML::Serializable::Strict
diff --git a/src/models/concerns/base.cr b/src/models/concerns/base.cr
index 9f0d656..a5afda5 100644
--- a/src/models/concerns/base.cr
+++ b/src/models/concerns/base.cr
@@ -3,14 +3,14 @@ module GX::Models::Concerns
   module Base
     def mounted?() : Bool
       mount_point_safe = @mount_point
-      raise "Invalid mountpoint value" if mount_point_safe.nil?
+      raise InvalidMountpointError.new("Invalid mountpoint value") if mount_point_safe.nil?
 
       `mount`.includes?(" on #{mount_point_safe} type ")
     end
 
     def umount() : Nil
       mount_point_safe = @mount_point
-      raise "Invalid mountpoint value" if mount_point_safe.nil?
+      raise InvalidMountpointError.new("Invalid mountpoint value") if mount_point_safe.nil?
 
       system("fusermount -u #{mount_point_safe.shellescape}")
       fusermount_status = $?
diff --git a/src/models/global_config.cr b/src/models/global_config.cr
index 25759b5..91cf2b7 100644
--- a/src/models/global_config.cr
+++ b/src/models/global_config.cr
@@ -7,6 +7,9 @@ require "yaml"
 require "./abstract_filesystem_config"
 
 module GX::Models
+  class InvalidEnvironmentError < Exception
+  end
+
   class GlobalConfig
     include YAML::Serializable
     include YAML::Serializable::Strict
@@ -15,7 +18,8 @@ module GX::Models
     getter mount_point : String?
 
     def after_initialize()
-      home_dir = ENV["HOME"] || raise "Home directory not found"
+      raise InvalidEnvironmentError.new("Home directory not found") if !ENV["HOME"]?
+      home_dir = ENV["HOME"]
 
       # Set default mountpoint from global if none defined
       if @mount_point.nil? || @mount_point.try &.empty?
diff --git a/src/models/gocryptfs_config.cr b/src/models/gocryptfs_config.cr
index 2dd3cb8..5d08263 100644
--- a/src/models/gocryptfs_config.cr
+++ b/src/models/gocryptfs_config.cr
@@ -23,7 +23,7 @@ module GX::Models
 
     def _mount_action()
       mount_point_safe = @mount_point
-      raise "Invalid mount point" if mount_point_safe.nil?
+      raise InvalidMountpointError.new("Invalid mount point") if mount_point_safe.nil?
 
       process = Process.new(
         "gocryptfs", 
diff --git a/src/models/httpdirfs_config.cr b/src/models/httpdirfs_config.cr
index 29ab5dd..c175558 100644
--- a/src/models/httpdirfs_config.cr
+++ b/src/models/httpdirfs_config.cr
@@ -23,7 +23,7 @@ module GX::Models
 
     def _mount_action()
       mount_point_safe = @mount_point
-      raise "Invalid mount point" if mount_point_safe.nil?
+      raise InvalidMountpointError.new("Invalid mount point") if mount_point_safe.nil?
 
       process = Process.new(
         "httpdirfs", 
diff --git a/src/models/sshfs_config.cr b/src/models/sshfs_config.cr
index 6b7e35c..c7e5853 100644
--- a/src/models/sshfs_config.cr
+++ b/src/models/sshfs_config.cr
@@ -26,7 +26,7 @@ module GX::Models
 
     def _mount_action()
       mount_point_safe = @mount_point
-      raise "Invalid mount point" if mount_point_safe.nil?
+      raise InvalidMountpointError.new("Invalid mount point") if mount_point_safe.nil?
 
       process = Process.new(
         "sshfs",