diff --git a/.code_preloader.yml b/.code_preloader.yml
new file mode 100644
index 0000000..97920cc
--- /dev/null
+++ b/.code_preloader.yml
@@ -0,0 +1,32 @@
+---
+# Example configuration for Code-Preloader
+
+# List of repository paths to preload
+# source_list:
+#   - "path/to/repo1"
+#   - "path/to/repo2"
+
+# List of patterns to ignore during preloading
+ignore_list:
+  - ^\.git/
+  - ^lib.*
+  - ^doc/
+  - ^bin/
+  - ^_prompts/
+  - ^\.reuse/
+  - ^LICENSES/
+  - ^\.vagrant/
+  - ^scripts/
+
+# Path to the output file (if null, output to STDOUT)
+output_path: null
+
+prompt:
+  # Optional: Path to a file containing the prompt header
+  header_path: null
+
+  # Optional: Path to a file containing the prompt footer
+  footer_path: null
+
+  # Optional: Path to a file container a jinja template to structure the prompt
+  template_path: null
diff --git a/.drone.yml b/.drone.yml
index 8999d06..1599bbe 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -5,7 +5,7 @@ name: default
 
 steps:
   - name: build:binary
-    image: crystallang/crystal:1.10.1-alpine
+    image: crystallang/crystal:1.11.0-alpine
     environment:
       PACKAGE_BASENAME: mfm_linux_amd64
     volumes:
diff --git a/.gitignore b/.gitignore
index ef729c3..ccd3fc2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 # SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
 # Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
 
+/_*
 .vagrant
 bin
 lib
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..73cb02e
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+crystal 1.10.1
diff --git a/Makefile b/Makefile
index 5e6983c..f0c5bb8 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,29 @@
 # SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
 # Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
 
+PREFIX=/usr
+
 all: build
 
+prepare:
+	shards install
+
 build:
-	shards build
+	shards build --error-trace -Dpreview_mt
+	@echo SUCCESS
+
+watch: 
+	 watchexec --restart --delay-run 3 -c -e cr make build
+
+spec: test
+test:
+	crystal spec --error-trace
+
+install:
+	install \
+		-m 755 \
+		bin/code-preloader \
+		$(PREFIX)/bin
+
+.PHONY: spec test build all prepare install
+
diff --git a/README.md b/README.md
index bc58143..8e1a613 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,13 @@
 -->
 
 [![Build Status](https://cicd.apps.glenux.net/api/badges/glenux/mfm/status.svg)](https://cicd.apps.glenux.net/glenux/mfm)
+![License LGPL3.0-or-later](https://img.shields.io/badge/license-LGPL3.0--or--later-blue.svg)
+[![Donate on patreon](https://img.shields.io/badge/patreon-donate-orange.svg)](https://patreon.com/glenux)
+
+> :information_source: This project is available on our self-hosted server and
+> on CodeBerg and GitHub as mirrors. For the latest updates and comprehensive
+> version of our project, please visit our primary repository at:
+> <https://code.apps.glenux.net/glenux/mfm>.
 
 # Minimalist Fuse Manager (MFM)
 
@@ -59,17 +66,56 @@ version](https://code.apps.glenux.net/glenux/mfm/releases) of MFM.
 
 ### Command Line Options
 
+Global
+
 ```
 Usage: mfm [options]
 
-Global options:
-    -c, --config FILE                Specify configuration file
-    -h, --help                       Display this help
+Global options
+    -c, --config FILE                Set configuration file
+    -v, --verbose                    Set more verbosity
+    -o, --open                       Automatically open directory after mount
+    --version                        Show version
+    -h, --help                       Show this help
 
 Commands (not implemented yet):
-    create                           Add a new filesystem
-    delete                           Remove an existing filesystem
-    edit                             Modify the configuration
+    config                           Manage configuration file
+    mapping                          Manage filesystems
+```
+
+Config management
+
+```
+Usage: mfm filesystem [options]
+
+Global options
+    -c, --config FILE                Set configuration file
+    -v, --verbose                    Set more verbosity
+    -o, --open                       Automatically open directory after mount
+    --version                        Show version
+    -h, --help                       Show this help
+
+Commands (not implemented yet):
+    init                             Create init file
+```
+
+Filesystem management
+
+```
+Usage: mfm mapping [options]
+
+Global options
+    -c, --config FILE                Set configuration file
+    -v, --verbose                    Set more verbosity
+    -o, --open                       Automatically open directory after mount
+    --version                        Show version
+    -h, --help                       Show this help
+
+Commands (not implemented yet):
+    list                             List fuse mappings
+    create                           Create new fuse mapping
+    edit                             Edit fuse mapping
+    delete                           Create new fuse mapping
 ```
 
 ### Demo
@@ -84,19 +130,20 @@ detail the filesystem names, types, and respective configurations.
 ### YAML File Format
 
 ```yaml
+---
 version: "1"
 
 global:
-  mountpoint: "/home/user/mnt/{{name}}"
+  mountpoint: "{{env.HOME}}/mnt"
 
 filesystems:
   - type: "gocryptfs"
     name: "Work - SSH Keys"
-    encrypted_path: "/home/user/.ssh/keyring.work"
+    encrypted_path: "/home/user/.ssh/keyring.work.vault"
 
   - type: "sshfs"
     name: "Personal - Media Server"
-    remote_user: "user"
+    remote_user: "{{env.USER}}"
     remote_host: "mediaserver.local"
     remote_path: "/mnt/largedisk/music"
     remote_port: 22
@@ -133,5 +180,5 @@ By contributing, you agree to our code of conduct and license terms.
 
 ## License
 
-GNU GPL-3
+GNU GPL-3 
 
diff --git a/doc/demo.mfm.yml b/doc/demo.mfm.yml
index 169fde8..8c8ff2b 100644
--- a/doc/demo.mfm.yml
+++ b/doc/demo.mfm.yml
@@ -1,9 +1,8 @@
 ---
-
 version: 1
 
 global:
-  mountpoint: "~/mnt"
+  mountpoint: "{{env.HOME}}/mnt"
 
 filesystems:
   - type: gocryptfs
@@ -16,7 +15,7 @@ filesystems:
 
   - type: sshfs
     name: "Personal - Remote Media Server"
-    remote_user: user
+    remote_user: "{{env.USER}}"
     remote_host: mediaserver.local
     remote_port: 22
     remote_path: "/remote/path/to/media"
diff --git a/shard.lock b/shard.lock
index e13838b..e19d81c 100644
--- a/shard.lock
+++ b/shard.lock
@@ -1,5 +1,9 @@
 version: 2.0
 shards:
+  ameba:
+    git: https://github.com/crystal-ameba/ameba.git
+    version: 1.6.1
+
   crinja:
     git: https://github.com/straight-shoota/crinja.git
     version: 0.8.1
@@ -8,6 +12,10 @@ shards:
     git: https://github.com/sztheory/shellwords-crystal.git
     version: 0.1.0
 
+  tablo:
+    git: https://github.com/hutou/tablo.git
+    version: 0.10.1
+
   version_from_shard:
     git: https://github.com/hugopl/version_from_shard.git
     version: 1.2.5
diff --git a/shard.yml b/shard.yml
index 91274e8..3b29118 100644
--- a/shard.yml
+++ b/shard.yml
@@ -5,17 +5,17 @@
 # Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
 
 name: Minimalist FUSE Manager
-version: 0.1.11
+version: 0.2.0
 
 targets:
   mfm:
     main: src/main.cr
 
-# authors:
-#   - name <email@example.com>
+authors:
+  - Glenn Y. Rolland <glenux@glenux.net>
 
-# description: |
-#   Short description of gx-vault
+description: |
+  FIXME. write description
 
 dependencies:
   crinja:
@@ -24,14 +24,11 @@ dependencies:
     github: szTheory/shellwords-crystal
   version_from_shard:
     github: hugopl/version_from_shard
+  tablo:
+    github: hutou/tablo
 
-# dependencies:
-#   pg:
-#     github: will/crystal-pg
-#     version: "~> 0.5"
-
-# development_dependencies:
-#   webmock:
-#     github: manastech/webmock.cr
+development_dependencies:
+  ameba:
+    github: crystal-ameba/ameba
 
 license: GPL-3
diff --git a/spec/spec_helper.cr b/spec/spec_helper.cr
new file mode 100644
index 0000000..e2f4f80
--- /dev/null
+++ b/spec/spec_helper.cr
@@ -0,0 +1 @@
+require "spec"
diff --git a/spec/utils/breadcrumbs_spec.cr b/spec/utils/breadcrumbs_spec.cr
new file mode 100644
index 0000000..deec943
--- /dev/null
+++ b/spec/utils/breadcrumbs_spec.cr
@@ -0,0 +1,46 @@
+require "../spec_helper"
+require "../../src/utils/breadcrumbs"
+
+describe GX::Utils::BreadCrumbs do
+  context "Initialization" do
+    it "can initialize from array" do
+      # empty string
+      b1 = GX::Utils::BreadCrumbs.new([] of String)
+      b1.to_a.should be_empty
+
+      # simple string
+      b2 = GX::Utils::BreadCrumbs.new(["test1"])
+      b2.to_a.should eq(["test1"])
+
+      # array
+      b3 = GX::Utils::BreadCrumbs.new(["test1", "test2"])
+      b3.to_a.should eq(["test1", "test2"])
+    end
+  end
+
+  context "Functioning" do
+    it "can add values" do
+      # empty string
+      b1 = GX::Utils::BreadCrumbs.new([] of String)
+      b1.to_a.should be_empty
+
+      # simple string
+      b2 = b1 + "test1"
+      b2.to_a.should eq(["test1"])
+
+      b3 = b2 + "test2"
+      b3.to_a.should eq(["test1", "test2"])
+    end
+
+    it "can become a string" do
+      b1 = GX::Utils::BreadCrumbs.new([] of String)
+      b1.to_s.should eq("")
+
+      b2 = b1 + "test1"
+      b2.to_a.should eq("test1")
+
+      b3 = b2 + "test2"
+      b3.to_a.should eq("test1 test2")
+    end
+  end
+end
diff --git a/src/cli.cr b/src/cli.cr
index f9a6578..04fa16f 100644
--- a/src/cli.cr
+++ b/src/cli.cr
@@ -5,128 +5,38 @@
 
 require "option_parser"
 require "./config"
-require "./fzf"
 require "./version"
+require "./parsers/root_parser"
+require "./utils/breadcrumbs"
+require "./utils/fzf"
+require "./file_system_manager"
+require "./command_factory"
 
 module GX
   class Cli
     Log = ::Log.for("cli")
 
-    @config : Config
+   @config : GX::Config
 
-    def initialize()
+    def initialize
       # Main execution starts here
+      # # FIXME: add a method to verify that FZF is installed
       @config = Config.new
-
-      ## FIXME: check that FZF is installed
     end
 
     def parse_command_line(args)
-      # update 
-      add_args = { name: "", path: "" }
-      delete_args = { name: "" }
       pparser = OptionParser.new do |parser|
-        parser.banner = "Usage: #{PROGRAM_NAME} [options]\n\nGlobal options"
-
-        parser.on("-c", "--config FILE", "Set configuration file") do |path|
-          Log.info { "Configuration set to #{path}" }
-          @config.path = path
-        end
-
-        parser.on("-v", "--verbose", "Set more verbosity") do |flag|
-          Log.info { "Verbosity enabled" }
-          @config.verbose = true
-        end
-
-        parser.on("--version", "Show version") do |flag|
-          @config.mode = Config::Mode::ShowVersion
-        end
-
-        parser.on("-h", "--help", "Show this help") do |flag|
-          STDOUT.puts parser
-          exit(0)
-        end
-
-        parser.separator("\nCommands")
-        parser.on("config", "Manage configuration") do 
-          parser.banner = "Usage: #{PROGRAM_NAME} config [commands] [options]\n\nGlobal options"
-          parser.separator("\nCommands")
-
-          parser.on("create", "Create vault") do 
-            @config.mode = Config::Mode::ConfigAdd
-
-            parser.banner = "Usage: #{PROGRAM_NAME} config create [commands] [options]\n\nGlobal options"
-            parser.separator("\nCommand options")
-
-            parser.on("-n", "--name", "Set vault name") do |name|
-              add_args = add_args.merge({ name: name })
-            end
-            parser.on("-p", "--path", "Set vault encrypted path") do |path|
-              add_args = add_args.merge({ path: path })
-            end
-          end
-
-          parser.on("delete", "Delete vault") do 
-            @config.mode = Config::Mode::ConfigAdd
-
-            parser.banner = "Usage: #{PROGRAM_NAME} delete [options]\n\nGlobal options"
-            parser.separator("\nCommand options")
-
-            parser.on("-n", "--name", "Set vault name") do |name|
-              delete_args = delete_args.merge({ name: name })
-            end
-          end
-
-          parser.on("edit", "Edit configuration") do |flag|
-            @config.mode = Config::Mode::ConfigEdit
-          end
-        end
-
+        breadcrumbs = Utils::BreadCrumbs.new([] of String)
+        Parsers::RootParser.new.build(parser, breadcrumbs, @config)
       end
       pparser.parse(args)
     end
 
-    def run()
-      case @config.mode 
-      when Config::Mode::ShowVersion
-        STDOUT.puts "#{PROGRAM_NAME} #{VERSION}"
-      when Config::Mode::Mount
-        @config.load_from_file
-        mount
-      end
-    end
-
-    def mount()
-      names_display = {} of String => NamedTuple(filesystem: Filesystem, ansi_name: String)
-      @config.filesystems.each do |filesystem|
-        fs_str = filesystem.type.ljust(12,' ')
-
-        suffix = ""
-        suffix_ansi = ""
-        if filesystem.mounted? 
-          suffix = "[open]"
-          suffix_ansi = "[#{ "open".colorize(:green) }]"
-        end
-
-        result_name = "#{fs_str} #{filesystem.name} #{suffix}".strip
-        ansi_name = "#{fs_str.colorize(:dark_gray)} #{filesystem.name} #{suffix_ansi}".strip
-
-        names_display[result_name] = {
-          filesystem: filesystem,
-          ansi_name: ansi_name
-        }
-      end
-
-      result_filesystem_name = Fzf.run(names_display.values.map(&.[:ansi_name]).sort).strip
-      selected_filesystem = names_display[result_filesystem_name][:filesystem]
-      puts ">> #{selected_filesystem.name}".colorize(:yellow)
-
-      if selected_filesystem
-        selected_filesystem.mounted? ? selected_filesystem.unmount : selected_filesystem.mount
-      else
-        STDERR.puts "Vault not found: #{selected_filesystem}.".colorize(:red)
-      end
+    def run
+      command = CommandFactory.create_command(@config, @config.mode)
+      abort("ERROR: unknown command for mode #{@config.mode}") if command.nil?
 
+      command.try &.execute
     end
   end
 end
diff --git a/src/command_factory.cr b/src/command_factory.cr
new file mode 100644
index 0000000..c2d7e22
--- /dev/null
+++ b/src/command_factory.cr
@@ -0,0 +1,11 @@
+require "./commands"
+
+module GX
+  class CommandFactory
+    def self.create_command(config : GX::Config, mode : GX::Types::Mode) : Commands::AbstractCommand?
+      classes = {{ Commands::AbstractCommand.all_subclasses }}
+      command_klass = classes.find { |klass| klass.handles_mode == mode }
+      command_klass.try &.new(config)
+    end
+  end
+end
diff --git a/src/commands.cr b/src/commands.cr
new file mode 100644
index 0000000..034a066
--- /dev/null
+++ b/src/commands.cr
@@ -0,0 +1 @@
+require "./commands/*"
diff --git a/src/commands/abstract_command.cr b/src/commands/abstract_command.cr
new file mode 100644
index 0000000..7591f15
--- /dev/null
+++ b/src/commands/abstract_command.cr
@@ -0,0 +1,13 @@
+require "../config"
+
+module GX::Commands
+  abstract class AbstractCommand
+    abstract def initialize(config : GX::Config)
+
+    abstract def execute
+
+    def self.mode
+      Gx::Types::Mode::None
+    end
+  end
+end
diff --git a/src/commands/config_init.cr b/src/commands/config_init.cr
new file mode 100644
index 0000000..b9407d3
--- /dev/null
+++ b/src/commands/config_init.cr
@@ -0,0 +1,15 @@
+require "./abstract_command"
+
+module GX::Commands
+  class ConfigInit < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::ConfigInit
+    end
+  end
+end
diff --git a/src/commands/global_completion.cr b/src/commands/global_completion.cr
new file mode 100644
index 0000000..d1be696
--- /dev/null
+++ b/src/commands/global_completion.cr
@@ -0,0 +1,15 @@
+require "./abstract_command"
+
+module GX::Commands
+  class GlobalCompletion < AbstractCommand
+    def initialize(@config : GX::Config)
+    end
+
+    def execute
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::GlobalConfig
+    end
+  end
+end
diff --git a/src/commands/global_config.cr b/src/commands/global_config.cr
new file mode 100644
index 0000000..c369556
--- /dev/null
+++ b/src/commands/global_config.cr
@@ -0,0 +1,15 @@
+require "./abstract_command"
+
+module GX::Commands
+  class GlobalConfig < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::GlobalConfig
+    end
+  end
+end
diff --git a/src/commands/global_help.cr b/src/commands/global_help.cr
new file mode 100644
index 0000000..78f1616
--- /dev/null
+++ b/src/commands/global_help.cr
@@ -0,0 +1,18 @@
+require "./abstract_command"
+
+module GX::Commands
+  class GlobalHelp < AbstractCommand
+    def initialize(@config : GX::Config) # FIXME
+    end
+
+    def execute
+      STDOUT.puts ""
+      @config.help_options.try { |opts| puts opts.parser_snapshot }
+      exit(0)
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::GlobalHelp
+    end
+  end
+end
diff --git a/src/commands/global_mapping.cr b/src/commands/global_mapping.cr
new file mode 100644
index 0000000..0c61b95
--- /dev/null
+++ b/src/commands/global_mapping.cr
@@ -0,0 +1,16 @@
+require "./abstract_command"
+
+module GX::Commands
+  class GlobalMapping < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+      # FIXME: implement
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::GlobalMapping
+    end
+  end
+end
diff --git a/src/commands/global_tui.cr b/src/commands/global_tui.cr
new file mode 100644
index 0000000..58f22ed
--- /dev/null
+++ b/src/commands/global_tui.cr
@@ -0,0 +1,25 @@
+require "./abstract_command"
+require "../file_system_manager"
+
+module GX::Commands
+  class GlobalTui < AbstractCommand
+    @file_system_manager : FileSystemManager
+
+    def initialize(@config : GX::Config)
+      @config.load_from_env
+      @config.load_from_file
+      @file_system_manager = FileSystemManager.new(@config)
+    end
+
+    def execute
+      filesystem = @file_system_manager.choose_filesystem
+      raise Models::InvalidFilesystemError.new("Invalid filesystem") if filesystem.nil?
+      @file_system_manager.mount_or_umount(filesystem)
+      @file_system_manager.auto_open(filesystem) if filesystem.mounted? && @config.auto_open
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::GlobalTui
+    end
+  end
+end
diff --git a/src/commands/global_version.cr b/src/commands/global_version.cr
new file mode 100644
index 0000000..9cd6757
--- /dev/null
+++ b/src/commands/global_version.cr
@@ -0,0 +1,17 @@
+require "./abstract_command"
+require "../config"
+
+module GX::Commands
+  class GlobalVersion < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+      STDOUT.puts "#{File.basename PROGRAM_NAME} #{VERSION}"
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::GlobalVersion
+    end
+  end
+end
diff --git a/src/commands/mapping_create.cr b/src/commands/mapping_create.cr
new file mode 100644
index 0000000..1e3ec6f
--- /dev/null
+++ b/src/commands/mapping_create.cr
@@ -0,0 +1,16 @@
+require "./abstract_command"
+
+module GX::Commands
+  class MappingCreate < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+      # FIXME: implement
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::MappingCreate
+    end
+  end
+end
diff --git a/src/commands/mapping_delete.cr b/src/commands/mapping_delete.cr
new file mode 100644
index 0000000..bed0534
--- /dev/null
+++ b/src/commands/mapping_delete.cr
@@ -0,0 +1,16 @@
+require "./abstract_command"
+
+module GX::Commands
+  class MappingDelete < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+      # FIXME: implement
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::MappingDelete
+    end
+  end
+end
diff --git a/src/commands/mapping_edit.cr b/src/commands/mapping_edit.cr
new file mode 100644
index 0000000..b0ef961
--- /dev/null
+++ b/src/commands/mapping_edit.cr
@@ -0,0 +1,16 @@
+require "./abstract_command"
+
+module GX::Commands
+  class MappingEdit < AbstractCommand
+    def initialize(config : GX::Config) # FIXME
+    end
+
+    def execute
+      # FIXME: implement
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::MappingEdit
+    end
+  end
+end
diff --git a/src/commands/mapping_list.cr b/src/commands/mapping_list.cr
new file mode 100644
index 0000000..35cd299
--- /dev/null
+++ b/src/commands/mapping_list.cr
@@ -0,0 +1,45 @@
+require "./abstract_command"
+require "../file_system_manager"
+require "tablo"
+
+module GX::Commands
+  class MappingList < AbstractCommand
+    def initialize(@config : GX::Config)
+      @config.load_from_env
+      @config.load_from_file
+      @file_system_manager = FileSystemManager.new(@config)
+    end
+
+    def execute
+      filesystems = @config.root.try &.filesystems
+      return if filesystems.nil?
+      # pp filesystems
+
+      fsdata = [] of Array(String)
+      filesystems.each do |item|
+        fsdata << [
+          item.type,
+          item.name,
+          item.mounted?.to_s,
+        ]
+      end
+      # pp fsdata
+
+      report = Tablo::Table.new(
+        fsdata,
+        # connectors: Tablo::CONNECTORS_SINGLE_ROUNDED
+        column_padding: 0,
+        style: "" # Tablo::STYLE_NO_MID_COL
+) do |table|
+        table.add_column("TYPE") { |row| row[0] }
+        table.add_column("NAME", width: 40) { |row| row[1] }
+        table.add_column("MOUNTED") { |row| row[2] }
+      end
+      puts report
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::MappingList
+    end
+  end
+end
diff --git a/src/commands/mapping_mount.cr b/src/commands/mapping_mount.cr
new file mode 100644
index 0000000..db81351
--- /dev/null
+++ b/src/commands/mapping_mount.cr
@@ -0,0 +1,26 @@
+require "./abstract_command"
+require "../file_system_manager"
+
+module GX::Commands
+  class MappingMount < AbstractCommand
+    @file_system_manager : FileSystemManager
+
+    def initialize(@config : GX::Config) # FIXME
+      @config.load_from_env
+      @config.load_from_file
+      @file_system_manager = FileSystemManager.new(@config)
+    end
+
+    def execute
+      filesystem = @file_system_manager.choose_filesystem
+      raise Models::InvalidFilesystemError.new("Invalid filesystem") if filesystem.nil?
+      # @file_system_manager.mount_or_umount(filesystem)
+      filesystem.mount
+      @file_system_manager.auto_open(filesystem) if filesystem.mounted? && @config.auto_open
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::MappingMount
+    end
+  end
+end
diff --git a/src/commands/mapping_umount.cr b/src/commands/mapping_umount.cr
new file mode 100644
index 0000000..dc61f1d
--- /dev/null
+++ b/src/commands/mapping_umount.cr
@@ -0,0 +1,24 @@
+require "./abstract_command"
+require "../file_system_manager"
+
+module GX::Commands
+  class MappingUmount < AbstractCommand
+    @file_system_manager : FileSystemManager
+
+    def initialize(@config : GX::Config) # FIXME
+      @config.load_from_env
+      @config.load_from_file
+      @file_system_manager = FileSystemManager.new(@config)
+    end
+
+    def execute
+      filesystem = @file_system_manager.choose_filesystem
+      raise Models::InvalidFilesystemError.new("Invalid filesystem") if filesystem.nil?
+      filesystem.umount
+    end
+
+    def self.handles_mode
+      GX::Types::Mode::MappingUmount
+    end
+  end
+end
diff --git a/src/config.cr b/src/config.cr
index 913c066..d375cce 100644
--- a/src/config.cr
+++ b/src/config.cr
@@ -5,46 +5,54 @@
 
 require "crinja"
 
-require "./filesystems"
+require "./models"
+require "./types/modes"
+require "./parsers/options/help_options"
+require "./parsers/options/config_options"
+require "./parsers/options/config_init_options"
+require "./commands/abstract_command"
 
 module GX
   class Config
     Log = ::Log.for("config")
 
-    enum Mode
-      ConfigAdd
-      ConfigDelete
-      ConfigEdit
-      ShowVersion
-      Mount
+    class MissingFileError < Exception
     end
 
     record NoArgs
     record AddArgs, name : String, path : String
     record DelArgs, name : String
 
-    getter filesystems : Array(Filesystem)
+    # getter filesystems : Array(Models::AbstractFilesystemConfig)
     getter home_dir : String
+    getter root : Models::RootConfig?
+
     property verbose : Bool
-    property mode : Mode
+    property mode : Types::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
+    # FIXME: refactor and remove these parts from here
+    property help_options : Parsers::Options::HelpOptions?
+    property config_init_options : Parsers::Options::ConfigInitOptions?
+    property config_options : Parsers::Options::ConfigOptions?
+
+    def initialize
+      raise Models::InvalidEnvironmentError.new("Home directory not found") if !ENV["HOME"]?
       @home_dir = ENV["HOME"]
 
       @verbose = false
-      @mode = Mode::Mount
-      @filesystems = [] of Filesystem
+      @auto_open = false
+
+      @mode = Types::Mode::GlobalTui
+      @filesystems = [] of Models::AbstractFilesystemConfig
       @path = nil
 
       @args = NoArgs
     end
 
-    def detect_config_file()
+    private def detect_config_file
       possible_files = [
         File.join(@home_dir, ".config", "mfm", "config.yaml"),
         File.join(@home_dir, ".config", "mfm", "config.yml"),
@@ -64,39 +72,43 @@ 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_env
+      if !ENV["FZF_DEFAULT_OPTS"]?
+        # force defaults settings if none defined
+        ENV["FZF_DEFAULT_OPTS"] = "--height 40% --layout=reverse --border"
+      end
     end
 
     def load_from_file
-      path = @path
-      if path.nil?
-        path = detect_config_file()
+      config_path = @path
+      if config_path.nil?
+        config_path = detect_config_file()
       end
-      @path = path
-      @filesystems = [] of Filesystem
+      @path = config_path
 
-      if !File.exists? path
+      if !File.exists? config_path
         Log.error { "File #{path} does not exist!".colorize(:red) }
         exit(1)
       end
-      load_filesystems(path)
-    end
 
-    private def load_filesystems(config_path : String)
       file_data = File.read(config_path)
-      # FIXME: render template on a value basis (instead of global)
-      file_patched = Crinja.render(file_data, {"env" => ENV.to_h}) 
+      file_patched = Crinja.render(file_data, {"env" => ENV.to_h})
 
-      yaml_data = YAML.parse(file_patched)
-      vaults_data = yaml_data["filesystems"].as_a
+      root = Models::RootConfig.from_yaml(file_patched)
 
-      vaults_data.each do |filesystem_data|
-        type = filesystem_data["type"].as_s
-        name = filesystem_data["name"].as_s
-        # encrypted_path = filesystem_data["encrypted_path"].as_s
-        @filesystems << Filesystem.from_yaml(filesystem_data.to_yaml)
-        # @filesystems << Filesystem.new(name, encrypted_path, "#{name}.Open")
+      mount_point_base_safe = root.global.mount_point_base
+      raise Models::InvalidMountpointError.new("Invalid global mount point") if mount_point_base_safe.nil?
+
+      root.filesystems.each do |selected_filesystem|
+        if !selected_filesystem.mount_point?
+          selected_filesystem.mount_point =
+            File.join(mount_point_base_safe, selected_filesystem.mounted_name)
+        end
       end
+      @root = root
     end
   end
 end
diff --git a/src/file_system_manager.cr b/src/file_system_manager.cr
new file mode 100644
index 0000000..91dc1a8
--- /dev/null
+++ b/src/file_system_manager.cr
@@ -0,0 +1,142 @@
+# require "./models/abstract_filesystem_config"
+require "./utils/fzf"
+
+module GX
+  class FileSystemManager
+    Log = ::Log.for("file_system_manager")
+
+    def initialize(@config : Config)
+    end
+
+    # OBSOLETE:
+    # def mount_filesystem(filesystem : Models::AbstractFilesystemConfig)
+    #   raise Models::InvalidFilesystemError.new("Invalid filesystem") if filesystem.nil?
+    #   if filesystem.mounted?
+    #     Log.info { "Filesystem already mounted." }
+    #     return
+    #   end
+    #   filesystem.mount
+    # end
+
+    # OBSOLETE:
+    # def umount_filesystem(filesystem : Models::AbstractFilesystemConfig)
+    #   raise Models::InvalidFilesystemError.new("Invalid filesystem") if filesystem.nil?
+    #   unless filesystem.mounted?
+    #     Log.info { "Filesystem is not mounted." }
+    #     return
+    #   end
+    #   filesystem.umount
+    # end
+
+    def mount_or_umount(selected_filesystem)
+      if !selected_filesystem.mounted?
+        selected_filesystem.mount
+      else
+        selected_filesystem.umount
+      end
+    end
+
+    def auto_open(filesystem)
+      # FIXME: detect xdg-open and use it if possible
+      # FIXME: detect mailcap and use it if no xdg-open found
+      # FIXME: support user-defined command in configuration
+      # 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 each(&)
+      config_root = @config.root
+      return if config_root.nil?
+
+      config_root.filesystems.each do |filesystem|
+        yield filesystem
+      end
+    end
+
+    def filesystems
+      config_root = @config.root
+      return if config_root.nil?
+
+      config_root.filesystems
+    end
+
+    def choose_filesystem
+      names_display = {} of String => NamedTuple(filesystem: Models::AbstractFilesystemConfig, ansi_name: String)
+
+      config_root = @config.root
+      return if config_root.nil?
+
+      config_root.filesystems.each do |filesystem|
+        fs_str = filesystem.type.ljust(12, ' ')
+
+        suffix = ""
+        suffix_ansi = ""
+        if filesystem.mounted?
+          suffix = "[open]"
+          suffix_ansi = "[#{"open".colorize(:green)}]"
+        end
+
+        result_name = "#{fs_str} #{filesystem.name} #{suffix}".strip
+        ansi_name = "#{fs_str.colorize(:dark_gray)} #{filesystem.name} #{suffix_ansi}".strip
+
+        names_display[result_name] = {
+          filesystem: filesystem,
+          ansi_name:  ansi_name,
+        }
+      end
+
+      # # FIXME: feat: allow to sort by name or by filesystem
+      sorted_values = names_display.values.sort_by { |item| item[:filesystem].name }
+      result_filesystem_name = Utils::Fzf.run(sorted_values.map(&.[:ansi_name])).strip
+      selected_filesystem = names_display[result_filesystem_name][:filesystem]
+      puts ">> #{selected_filesystem.name}".colorize(:yellow)
+
+      if !selected_filesystem
+        STDERR.puts "Vault not found: #{selected_filesystem}.".colorize(:red)
+        return
+      end
+      return selected_filesystem
+    end
+
+    private def generate_display_name(filesystem : Models::AbstractFilesystemConfig) : String
+      fs_str = filesystem.type.ljust(12, ' ')
+      suffix = filesystem.mounted? ? "[open]" : ""
+      "#{fs_str} #{filesystem.name} #{suffix}".strip
+    end
+
+    private def graphical_environment?
+      if ENV["DISPLAY"]? || ENV["WAYLAND_DISPLAY"]?
+        return true
+      end
+      return false
+    end
+  end
+end
diff --git a/src/filesystems.cr b/src/filesystems.cr
deleted file mode 100644
index 2026122..0000000
--- a/src/filesystems.cr
+++ /dev/null
@@ -1,9 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
-# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
-
-require "./filesystems/gocryptfs"
-require "./filesystems/sshfs"
-require "./filesystems/httpdirfs"
-require "./filesystems/filesystem"
diff --git a/src/filesystems/filesystem.cr b/src/filesystems/filesystem.cr
deleted file mode 100644
index b5cf44d..0000000
--- a/src/filesystems/filesystem.cr
+++ /dev/null
@@ -1,42 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
-# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
-
-require "yaml"
-
-module GX
-  abstract class Filesystem
-    include YAML::Serializable
-
-    use_yaml_discriminator "type", {
-      gocryptfs: GoCryptFS, 
-      sshfs: SshFS,
-      httpdirfs: HttpDirFS
-    }
-
-    property type : String
-  end
-
-  module GenericFilesystem
-    def unmount
-      system("fusermount -u #{mount_dir.shellescape}")
-      puts "Filesystem #{name} is now closed.".colorize(:green)
-    end
-
-    def mount(&block)
-      Dir.mkdir_p(mount_dir) unless Dir.exists?(mount_dir)
-      if mounted?
-        puts "Already mounted. Skipping.".colorize(:yellow)
-        return
-      end
-
-      yield
-
-      puts "Filesystem #{name} is now available on #{mount_dir}".colorize(:green)
-    end
-  end
-end
-
-require "./gocryptfs"
-require "./sshfs"
diff --git a/src/filesystems/gocryptfs.cr b/src/filesystems/gocryptfs.cr
deleted file mode 100644
index ebe7f83..0000000
--- a/src/filesystems/gocryptfs.cr
+++ /dev/null
@@ -1,47 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
-# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
-
-require "shellwords"
-require "./filesystem"
-
-module GX
-  class GoCryptFS < Filesystem
-    getter name : String = ""
-    getter encrypted_path : String = ""
-
-    @[YAML::Field(key: "mount_dir", ignore: true)]
-    getter mount_dir : String = ""
-
-    include GenericFilesystem
-
-    def after_initialize()
-      home_dir = ENV["HOME"] || raise "Home directory not found"
-      @mount_dir = File.join(home_dir, "mnt/#{@name}.Open")
-    end
-
-    def mounted? : Bool
-      `mount`.includes?("#{encrypted_path} on #{mount_dir}")
-    end
-
-    def mount
-      super do 
-        input = STDIN
-        output = STDOUT
-        error = STDERR
-        process = Process.new(
-          "gocryptfs", 
-          ["-idle", "15m", encrypted_path, mount_dir], 
-          input: input, 
-          output: output, 
-          error: error
-        )
-        unless process.wait.success?
-          puts "Error mounting the vault".colorize(:red)
-          return
-        end
-      end
-    end
-  end
-end
diff --git a/src/filesystems/httpdirfs.cr b/src/filesystems/httpdirfs.cr
deleted file mode 100644
index e1e4279..0000000
--- a/src/filesystems/httpdirfs.cr
+++ /dev/null
@@ -1,48 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
-# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
-
-require "shellwords"
-require "./filesystem"
-
-module GX
-  class HttpDirFS < Filesystem
-    getter name : String = ""
-    getter url : String = ""
-
-    @[YAML::Field(key: "mount_dir", ignore: true)]
-    getter mount_dir : String = ""
-
-    include GenericFilesystem
-
-    def after_initialize()
-      home_dir = ENV["HOME"] || raise "Home directory not found"
-      @mount_dir = File.join(home_dir, "mnt/#{@name}")
-    end
-
-    def mounted? : Bool
-      `mount`.includes?("httpdirfs on #{mount_dir}")
-    end
-
-    def mount
-      super do
-        input = STDIN
-        output = STDOUT
-        error = STDERR
-        process = Process.new(
-          "httpdirfs", 
-          ["#{url}", mount_dir], 
-          input: input, 
-          output: output, 
-          error: error
-        )
-        unless process.wait.success?
-          puts "Error mounting the filesystem".colorize(:red)
-          return
-        end
-      end
-    end
-  end
-end
-
diff --git a/src/filesystems/sshfs.cr b/src/filesystems/sshfs.cr
deleted file mode 100644
index 44ddab9..0000000
--- a/src/filesystems/sshfs.cr
+++ /dev/null
@@ -1,54 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
-# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
-
-require "shellwords"
-require "./filesystem"
-
-module GX
-  class SshFS < Filesystem
-    getter name : String = ""
-    getter remote_path : String = ""
-    getter remote_user : String = ""
-    getter remote_host : String = ""
-    getter remote_port : String = "22"
-
-    @[YAML::Field(key: "mount_dir", ignore: true)]
-    getter mount_dir : String = ""
-
-    include GenericFilesystem
-
-    def after_initialize()
-      home_dir = ENV["HOME"] || raise "Home directory not found"
-      @mount_dir = File.join(home_dir, "mnt/#{@name}")
-    end
-
-    def mounted? : Bool
-      `mount`.includes?("#{remote_user}@#{remote_host}:#{remote_path} on #{mount_dir}")
-    end
-
-    def mount
-      super do
-        input = STDIN
-        output = STDOUT
-        error = STDERR
-        process = Process.new(
-          "sshfs", 
-          [
-            "-p", remote_port,
-            "#{remote_user}@#{remote_host}:#{remote_path}", 
-            mount_dir
-          ], 
-          input: input, 
-          output: output, 
-          error: error
-        )
-        unless process.wait.success?
-          puts "Error mounting the filesystem".colorize(:red)
-          return
-        end
-      end
-    end
-  end
-end
diff --git a/src/main.cr b/src/main.cr
index f32183c..c02ff74 100644
--- a/src/main.cr
+++ b/src/main.cr
@@ -8,7 +8,6 @@ require "colorize"
 require "json"
 require "log"
 
-require "./filesystems/gocryptfs"
 require "./config"
 require "./cli"
 
@@ -32,9 +31,6 @@ Log.setup do |config|
   end
 end
 
-
-app = GX::Cli.new
-app.parse_command_line(ARGV)
-app.run
-
-
+cli = GX::Cli.new
+cli.parse_command_line(ARGV)
+cli.run
diff --git a/src/models.cr b/src/models.cr
new file mode 100644
index 0000000..a5d97a4
--- /dev/null
+++ b/src/models.cr
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "./models/root_config"
+require "./models/global_config"
+require "./models/gocryptfs_config"
+require "./models/sshfs_config"
+require "./models/httpdirfs_config"
+require "./models/abstract_filesystem_config"
diff --git a/src/models/abstract_filesystem_config.cr b/src/models/abstract_filesystem_config.cr
new file mode 100644
index 0000000..928a0d7
--- /dev/null
+++ b/src/models/abstract_filesystem_config.cr
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "yaml"
+
+module GX::Models
+  class InvalidFilesystemError < Exception
+  end
+
+  class InvalidMountpointError < Exception
+  end
+
+  abstract class AbstractFilesystemConfig
+    include YAML::Serializable
+    # include YAML::Serializable::Strict
+
+    use_yaml_discriminator "type", {
+      gocryptfs: GoCryptFSConfig,
+      sshfs:     SshFSConfig,
+      httpdirfs: HttpDirFSConfig,
+    }
+
+    getter type : String
+    getter name : String
+    property mount_point : String?
+
+    abstract def _mount_wrapper(&block)
+    abstract def _mount_action
+    abstract def _mounted_prefix
+    abstract def mounted_name
+    abstract def mounted?
+    abstract def mount
+    abstract def umount
+    abstract def mount_point?
+  end
+end
diff --git a/src/models/concerns/base.cr b/src/models/concerns/base.cr
new file mode 100644
index 0000000..90254de
--- /dev/null
+++ b/src/models/concerns/base.cr
@@ -0,0 +1,54 @@
+module GX::Models::Concerns
+  module Base
+    def mounted? : Bool
+      mount_point_safe = @mount_point
+      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 InvalidMountpointError.new("Invalid mountpoint value") if mount_point_safe.nil?
+
+      system("fusermount -u #{mount_point_safe.shellescape}")
+      fusermount_status = $?
+
+      if fusermount_status.success?
+        puts "Models #{name} is now closed.".colorize(:green)
+      else
+        puts "Error: Unable to unmount filesystem #{name} (exit code: #{fusermount_status.exit_code}).".colorize(:red)
+      end
+    end
+
+    def mount_point?
+      !mount_point.nil?
+    end
+
+    def mount
+      _mount_wrapper() do
+        _mount_action
+      end
+    end
+
+    def _mount_wrapper(&block) : Nil
+      mount_point_safe = mount_point
+      return if mount_point_safe.nil?
+
+      Dir.mkdir_p(mount_point_safe) unless Dir.exists?(mount_point_safe)
+      if mounted?
+        puts "Already mounted. Skipping.".colorize(:yellow)
+        return
+      end
+
+      result_status = yield
+
+      if result_status.success?
+        puts "Models #{name} is now available on #{mount_point_safe}".colorize(:green)
+      else
+        puts "Error mounting the vault".colorize(:red)
+        return
+      end
+    end
+  end
+end
diff --git a/src/models/global_config.cr b/src/models/global_config.cr
new file mode 100644
index 0000000..2cd57c1
--- /dev/null
+++ b/src/models/global_config.cr
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "yaml"
+require "./abstract_filesystem_config"
+
+module GX::Models
+  class InvalidEnvironmentError < Exception
+  end
+
+  class GlobalConfig
+    include YAML::Serializable
+    include YAML::Serializable::Strict
+
+    @[YAML::Field(key: "mount_point_base")]
+    getter mount_point_base : String?
+
+    def after_initialize
+      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_base.nil? || @mount_point_base.try &.empty?
+        @mount_point_base = File.join(home_dir, "mnt")
+      end
+    end
+  end
+end
diff --git a/src/models/gocryptfs_config.cr b/src/models/gocryptfs_config.cr
new file mode 100644
index 0000000..9013bdf
--- /dev/null
+++ b/src/models/gocryptfs_config.cr
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "shellwords"
+require "./abstract_filesystem_config"
+require "./concerns/base"
+
+module GX::Models
+  class GoCryptFSConfig < AbstractFilesystemConfig
+    getter encrypted_path : String = ""
+
+    include Concerns::Base
+
+    def _mounted_prefix
+      "#{encrypted_path}"
+    end
+
+    def mounted_name
+      "#{@name}.Open"
+    end
+
+    def _mount_action
+      mount_point_safe = @mount_point
+      raise InvalidMountpointError.new("Invalid mount point") if mount_point_safe.nil?
+
+      process = Process.new(
+        "gocryptfs",
+        ["-idle", "15m", @encrypted_path, mount_point_safe],
+        input: STDIN,
+        output: STDOUT,
+        error: STDERR
+      )
+      return process.wait
+    end
+  end
+end
diff --git a/src/models/httpdirfs_config.cr b/src/models/httpdirfs_config.cr
new file mode 100644
index 0000000..30db9eb
--- /dev/null
+++ b/src/models/httpdirfs_config.cr
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "shellwords"
+require "./abstract_filesystem_config"
+require "./concerns/base"
+
+module GX::Models
+  class HttpDirFSConfig < AbstractFilesystemConfig
+    getter url : String = ""
+
+    include Concerns::Base
+
+    def _mounted_prefix
+      "httpdirfs"
+    end
+
+    def mounted_name
+      @name
+    end
+
+    def _mount_action
+      mount_point_safe = @mount_point
+      raise InvalidMountpointError.new("Invalid mount point") if mount_point_safe.nil?
+
+      process = Process.new(
+        "httpdirfs",
+        ["#{@url}", mount_point_safe],
+        input: STDIN,
+        output: STDOUT,
+        error: STDERR
+      )
+      return process.wait
+    end
+  end
+end
diff --git a/src/models/root_config.cr b/src/models/root_config.cr
new file mode 100644
index 0000000..d88dc61
--- /dev/null
+++ b/src/models/root_config.cr
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "yaml"
+require "./abstract_filesystem_config"
+require "./global_config"
+
+module GX::Models
+  # class CrinjaConverter
+  #   def self.from_yaml(ctx : YAML::ParseContext , node : YAML::Nodes::Node)
+  #     l_node = node
+  #     if l_node.is_a?(YAML::Nodes::Scalar)
+  #       value_patched = Crinja.render(l_node.value, {"env" => ENV.to_h})
+  #       return value_patched
+  #     end
+
+  #     return "<null>"
+  #   end
+  #
+  #   def self.to_yaml(value, builder : YAML::Nodes::Builder)
+  #   end
+  # end
+
+  class RootConfig
+    include YAML::Serializable
+    include YAML::Serializable::Strict
+
+    # @[YAML::Field(key: "version", converter: GX::Models::CrinjaConverter)]
+    @[YAML::Field(key: "version")]
+    getter version : String
+
+    @[YAML::Field(key: "global")]
+    getter global : GlobalConfig
+
+    @[YAML::Field(key: "filesystems")]
+    getter filesystems : Array(AbstractFilesystemConfig)
+  end
+end
diff --git a/src/models/sshfs_config.cr b/src/models/sshfs_config.cr
new file mode 100644
index 0000000..898ccdb
--- /dev/null
+++ b/src/models/sshfs_config.cr
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+require "shellwords"
+require "./abstract_filesystem_config"
+require "./concerns/base"
+
+module GX::Models
+  class SshFSConfig < AbstractFilesystemConfig
+    getter remote_path : String = ""
+    getter remote_user : String = ""
+    getter remote_host : String = ""
+    getter remote_port : String = "22"
+    getter options : Array(String) = [] of String
+
+    include Concerns::Base
+
+    def _mounted_prefix
+      "#{@remote_user}@#{@remote_host}:#{@remote_path}"
+    end
+
+    def mounted_name
+      @name
+    end
+
+    def _mount_action
+      mount_point_safe = @mount_point
+      raise InvalidMountpointError.new("Invalid mount point") if mount_point_safe.nil?
+
+      options = [] of String
+      # merge sshfs options
+      @options.each do |option|
+        options.push("-o", option)
+      end
+      options.push("-p", remote_port)
+      options.push(
+        "#{@remote_user}@#{@remote_host}:#{@remote_path}",
+          mount_point_safe
+      )
+      process = Process.new(
+        "sshfs",
+        options,
+        input: STDIN,
+        output: STDOUT,
+        error: STDERR
+      )
+      return process.wait
+    end
+  end
+end
+
diff --git a/src/parsers/base.cr b/src/parsers/base.cr
new file mode 100644
index 0000000..8f3573b
--- /dev/null
+++ b/src/parsers/base.cr
@@ -0,0 +1,5 @@
+module GX::Parsers
+  abstract class AbstractParser
+    abstract def build(parser : OptionParser, ancestors : BreadCrumbs, config : Config)
+  end
+end
diff --git a/src/parsers/completion_parser.cr b/src/parsers/completion_parser.cr
new file mode 100644
index 0000000..1cdc4cc
--- /dev/null
+++ b/src/parsers/completion_parser.cr
@@ -0,0 +1,26 @@
+require "./base.cr"
+
+module GX::Parsers
+  class CompletionParser < AbstractParser
+    def build(parser, ancestors, config)
+      breadcrumbs = ancestors + "completion"
+
+      parser.banner = Utils.usage_line(
+        breadcrumbs,
+        "Manage #{PROGRAM_NAME} completion",
+        true
+      )
+      parser.separator("\nCompletion commands:")
+
+      parser.on("--bash", "Generate bash completion") do |flag|
+        Log.info { "Set bash completion" }
+      end
+
+      parser.on("--zsh", "Generate zsh completion") do |flag|
+        Log.info { "Set zsh completion" }
+      end
+
+      parser.separator Utils.help_line(breadcrumbs)
+    end
+  end
+end
diff --git a/src/parsers/config_parser.cr b/src/parsers/config_parser.cr
new file mode 100644
index 0000000..b902cd5
--- /dev/null
+++ b/src/parsers/config_parser.cr
@@ -0,0 +1,38 @@
+require "./options/config_options"
+require "./options/config_init_options"
+require "./base"
+require "../types/modes"
+require "../utils/parser_lines"
+
+module GX::Parsers
+  class ConfigParser < AbstractParser
+    def build(parser, ancestors, config)
+      breadcrumbs = ancestors + "config"
+      config.config_options = Parsers::Options::ConfigOptions.new
+      parser.banner = Utils.usage_line(
+        breadcrumbs,
+        "Helpers for #{PROGRAM_NAME}'s configuration file",
+        true
+      )
+      parser.separator("\nConfig commands")
+
+      parser.on("init", "Create initial mfm configuration") do
+        config.mode = Types::Mode::ConfigInit
+        config.config_init_options = Parsers::Options::ConfigInitOptions.new
+
+        parser.banner = Utils.usage_line(breadcrumbs + "init", "Create initial mfm configuration")
+        parser.separator("\nInit options")
+
+        parser.on("-p", "--path", "Set vault encrypted path") do |path|
+          config.config_init_options.try do |opts|
+            opts.path = path
+          end
+        end
+
+        parser.separator(Utils.help_line(breadcrumbs + "init"))
+      end
+
+      parser.separator(Utils.help_line(breadcrumbs))
+    end
+  end
+end
diff --git a/src/parsers/mapping_parser.cr b/src/parsers/mapping_parser.cr
new file mode 100644
index 0000000..fc972a9
--- /dev/null
+++ b/src/parsers/mapping_parser.cr
@@ -0,0 +1,73 @@
+require "./base.cr"
+require "../utils/parser_lines"
+
+module GX::Parsers
+  class MappingParser < AbstractParser
+    def build(parser, ancestors, config)
+      breadcrumbs = ancestors + "mapping"
+      add_args = {name: "", path: ""}
+      delete_args = {name: ""}
+
+      parser.banner = Utils.usage_line(
+        breadcrumbs,
+        "Manage FUSE filesystem mappings",
+        true
+      )
+      parser.separator("\nCommands")
+
+      parser.on("list", "List mappings") do
+        config.mode = Types::Mode::MappingList
+        parser.separator(Utils.help_line(breadcrumbs + "list"))
+        # abort("FIXME: Not implemented")
+      end
+
+      parser.on("create", "Create mapping") do
+        config.mode = Types::Mode::MappingCreate
+
+        pp parser
+        parser.banner = Utils.usage_line(breadcrumbs + "create", "Create mapping", true)
+        parser.separator("\nCreate options")
+
+        parser.on("-n", "--name", "Set vault name") do |name|
+          add_args = add_args.merge({name: name})
+        end
+        parser.on("-p", "--path", "Set vault encrypted path") do |path|
+          add_args = add_args.merge({path: path})
+        end
+        parser.separator(Utils.help_line(breadcrumbs + "create"))
+      end
+
+      parser.on("edit", "Edit configuration") do |flag|
+        config.mode = Types::Mode::MappingEdit
+        parser.separator(Utils.help_line(breadcrumbs + "edit"))
+        # abort("FIXME: Not implemented")
+      end
+
+      parser.on("mount", "Mount mapping") do |flag|
+        config.mode = Types::Mode::MappingMount
+        parser.separator(Utils.help_line(breadcrumbs + "mount"))
+        # abort("FIXME: Not implemented")
+      end
+
+      parser.on("umount", "Umount mapping") do |flag|
+        config.mode = Types::Mode::MappingUmount
+        parser.separator(Utils.help_line(breadcrumbs + "umount"))
+        # abort("FIXME: Not implemented")
+      end
+
+      parser.on("delete", "Delete mapping") do
+        config.mode = Types::Mode::MappingDelete
+
+        parser.banner = Utils.usage_line(breadcrumbs + "delete", "Delete mapping", true)
+        parser.separator("\nDelete options")
+
+        parser.on("-n", "--name", "Set vault name") do |name|
+          delete_args = delete_args.merge({name: name})
+        end
+        parser.separator(Utils.help_line(breadcrumbs + "delete"))
+      end
+
+      parser.separator Utils.help_line(breadcrumbs)
+    end
+  end
+end
diff --git a/src/parsers/options/config_init_options.cr b/src/parsers/options/config_init_options.cr
new file mode 100644
index 0000000..97a31a3
--- /dev/null
+++ b/src/parsers/options/config_init_options.cr
@@ -0,0 +1,7 @@
+require "option_parser"
+
+module GX::Parsers::Options
+  class ConfigInitOptions
+    property path : String?
+  end
+end
diff --git a/src/parsers/options/config_options.cr b/src/parsers/options/config_options.cr
new file mode 100644
index 0000000..6cacac0
--- /dev/null
+++ b/src/parsers/options/config_options.cr
@@ -0,0 +1,6 @@
+require "option_parser"
+
+module GX::Parsers::Options
+  class ConfigOptions
+  end
+end
diff --git a/src/parsers/options/help_options.cr b/src/parsers/options/help_options.cr
new file mode 100644
index 0000000..e81fa2e
--- /dev/null
+++ b/src/parsers/options/help_options.cr
@@ -0,0 +1,7 @@
+require "option_parser"
+
+module GX::Parsers::Options
+  class HelpOptions
+    property parser_snapshot : OptionParser? = nil
+  end
+end
diff --git a/src/parsers/root_parser.cr b/src/parsers/root_parser.cr
new file mode 100644
index 0000000..70ac5a5
--- /dev/null
+++ b/src/parsers/root_parser.cr
@@ -0,0 +1,92 @@
+require "./base"
+require "./config_parser"
+require "./mapping_parser"
+require "./completion_parser"
+require "../utils/parser_lines"
+require "../commands"
+
+module GX::Parsers
+  class RootParser < AbstractParser
+    def build(parser, ancestors, config)
+      breadcrumbs = ancestors + (File.basename PROGRAM_NAME)
+
+      parser.banner = Utils.usage_line(
+        breadcrumbs,
+        "A management tool for your various FUSE filesystems",
+        true
+      )
+
+      parser.on("-c", "--config FILE", "Set configuration file") do |path|
+        Log.info { "Configuration set to #{path}" }
+        config.path = path
+      end
+
+      parser.on("-v", "--verbose", "Set more verbosity") do |flag|
+        Log.info { "Verbosity enabled" }
+        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 = Types::Mode::GlobalVersion
+      end
+
+      parser.on("-h", "--help", "Show this help") do |flag|
+        config.mode = Types::Mode::GlobalHelp
+        config.help_options = Parsers::Options::HelpOptions.new
+        config.help_options.try { |opts| opts.parser_snapshot = parser.dup }
+      end
+
+      parser.separator("\nGlobal commands:")
+
+      parser.on("config", "Manage configuration file") do
+        config.mode = Types::Mode::GlobalHelp
+        config.help_options = Parsers::Options::HelpOptions.new
+        config.help_options.try { |opts| opts.parser_snapshot = parser.dup }
+
+        # config.command = Commands::Config.new(config)
+        Parsers::ConfigParser.new.build(parser, breadcrumbs, config)
+      end
+
+      parser.on("tui", "Interactive text user interface (default)") do
+        config.mode = Types::Mode::GlobalTui
+      end
+
+      parser.on("mapping", "Manage mappings") do
+        config.mode = Types::Mode::GlobalHelp
+        config.help_options = Parsers::Options::HelpOptions.new
+        config.help_options.try { |opts| opts.parser_snapshot = parser.dup }
+
+        Parsers::MappingParser.new.build(parser, breadcrumbs, config)
+      end
+
+      # parser.on("interactive", "Interactive mapping mount/umount") do
+      #   abort("FIXME: Not implemented")
+      # end
+
+      parser.on("completion", "Manage completion") do
+        config.mode = Types::Mode::GlobalCompletion
+        Parsers::CompletionParser.new.build(parser, breadcrumbs, config)
+      end
+
+      parser.separator(Utils.help_line(breadcrumbs))
+
+      # Manage errors
+      parser.unknown_args do |remaining_args, _|
+        next if remaining_args.size == 0
+
+        puts parser
+        abort("ERROR: Invalid arguments: #{remaining_args.join(" ")}")
+      end
+
+      parser.invalid_option do |ex|
+        puts parser
+        abort("ERROR: Invalid option: '#{ex}'!")
+      end
+    end
+  end
+end
diff --git a/src/types/modes.cr b/src/types/modes.cr
new file mode 100644
index 0000000..6498f89
--- /dev/null
+++ b/src/types/modes.cr
@@ -0,0 +1,21 @@
+module GX::Types
+  enum Mode
+    None
+
+    GlobalVersion
+    GlobalHelp
+    GlobalCompletion
+    GlobalTui
+    GlobalConfig
+    GlobalMapping
+
+    ConfigInit
+
+    MappingCreate
+    MappingDelete
+    MappingEdit
+    MappingList
+    MappingMount
+    MappingUmount
+  end
+end
diff --git a/src/utils/breadcrumbs.cr b/src/utils/breadcrumbs.cr
new file mode 100644
index 0000000..89c54e9
--- /dev/null
+++ b/src/utils/breadcrumbs.cr
@@ -0,0 +1,19 @@
+module GX::Utils
+  class BreadCrumbs
+    def initialize(base : Array(String))
+      @ancestors = base
+    end
+
+    def +(elem : String)
+      b = BreadCrumbs.new(@ancestors + [elem])
+    end
+
+    def to_s
+      @ancestors.join(" ")
+    end
+
+    def to_a
+      @ancestors.clone
+    end
+  end
+end
diff --git a/src/fzf.cr b/src/utils/fzf.cr
similarity index 92%
rename from src/fzf.cr
rename to src/utils/fzf.cr
index bd1acc2..ff626f3 100644
--- a/src/fzf.cr
+++ b/src/utils/fzf.cr
@@ -3,9 +3,8 @@
 # SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
 # Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
 
-module GX
+module GX::Utils
   class Fzf
-
     def self.run(list : Array(String)) : String
       input = IO::Memory.new
       input.puts list.join("\n")
@@ -29,8 +28,7 @@ module GX
         exit(1)
       end
 
-      result = output.to_s.strip #.split.first?
+      result = output.to_s.strip # .split.first?
     end
   end
 end
-
diff --git a/src/utils/parser_lines.cr b/src/utils/parser_lines.cr
new file mode 100644
index 0000000..dacd71f
--- /dev/null
+++ b/src/utils/parser_lines.cr
@@ -0,0 +1,17 @@
+require "./breadcrumbs"
+
+module GX::Utils
+  def self.usage_line(breadcrumbs : BreadCrumbs, description : String, has_commands : Bool = false)
+    [
+      "Usage: #{breadcrumbs.to_s}#{has_commands ? " [commands]" : ""} [options]",
+      "",
+      description,
+      "",
+      "Global options:",
+    ].join("\n")
+  end
+
+  def self.help_line(breadcrumbs : BreadCrumbs)
+    "\nRun '#{breadcrumbs.to_s} COMMAND --help' for more information on a command."
+  end
+end
diff --git a/src/version.cr b/src/version.cr
index 89bd308..0fd98ff 100644
--- a/src/version.cr
+++ b/src/version.cr
@@ -1,8 +1,5 @@
-
 require "version_from_shard"
 
 module GX
   VersionFromShard.declare
 end
-
-
diff --git a/static/completion.bash b/static/completion.bash
new file mode 100644
index 0000000..d990879
--- /dev/null
+++ b/static/completion.bash
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# mfm Bash completion script
+
+_mfm() {
+    local cur prev opts
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+    # Options globales pour 'mfm'
+    local mfm_global_opts="-c --config -v --verbose -o --open --version -h --help"
+
+    # Commandes pour 'mfm'
+    local mfm_cmds="config mapping completion"
+
+    # Options pour 'config' et 'mapping'
+    local config_opts="init"
+    local mapping_opts="list create edit mount umount delete"
+
+    # Ajouter les options globales à chaque cas
+    case "${prev}" in
+        mfm)
+            COMPREPLY=($(compgen -W "${mfm_cmds} ${mfm_global_opts}" -- ${cur}))
+            return 0
+            ;;
+        config)
+            COMPREPLY=($(compgen -W "${config_opts} ${mfm_global_opts}" -- ${cur}))
+            return 0
+            ;;
+        mapping)
+            COMPREPLY=($(compgen -W "${mapping_opts} ${mfm_global_opts}" -- ${cur}))
+            return 0
+            ;;
+        *)
+            if [[ ${cur} == -* ]]; then
+                COMPREPLY=($(compgen -W "${mfm_global_opts}" -- ${cur}))
+            fi
+            return 0
+            ;;
+    esac
+}
+
+# Appliquer la complétion à la fonction 'mfm'
+complete -F _mfm mfm