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Nitrocid KS - Manual
Nitrocid KS - Manual
  • Welcome!
  • Versions and Compatibility
    • Supported Versions
    • EOL Versions
    • Version Release Notes
      • v0.0.1.x series
      • v0.0.2.x series
      • v0.0.3.x series
      • v0.0.4.x series
      • v0.0.5.x series
        • v0.0.5.0 Beta Versions
      • v0.0.6.x series
        • v0.0.6.0 Beta Versions
      • v0.0.7.x series
        • v0.0.7.0 Beta Versions
      • v0.0.8.x series
      • v0.0.9.x series
      • v0.0.10.x series
      • v0.0.11.x series
      • v0.0.12.x series
      • v0.0.13.x series
      • v0.0.14.x series
      • v0.0.15.x series
      • v0.0.16.x series
      • v0.0.17.x series
      • v0.0.18.x series
      • v0.0.19.x series
      • v0.0.20.x series
      • v0.0.21.x series
      • v0.0.22.x series
      • v0.0.23.x series
      • v0.0.24.x series
      • v0.1.0.x and 0.1.1.x series
      • v0.1.2.x and v0.1.3.x series
    • Compatibility Notes for KS API Revisions
      • Upgrading to API v1.0 series
      • Upgrading to API v1.1 series
      • Upgrading to API v1.2 series
      • Upgrading to API v1.3 series
      • Upgrading to API v2.0 series
      • Upgrading to API v2.1 series
      • Upgrading to API v3.0 series
        • From 0.0.24.x to 0.1.0 Beta 1
        • From 0.1.0 Beta 1 to 0.1.0 Beta 2
        • From 0.1.0 Beta 2 to 0.1.0 Beta 3
        • From 0.1.0 Beta 3 to 0.1.0 RC
        • From 0.1.0 RC to 0.1.0 Final
      • Upgrading to API v3.1 series
  • Installation and Maintenance
    • Installing the Kernel
      • Windows
      • macOS
      • Linux
      • Android
    • Upgrading the Kernel
      • Windows
      • macOS
      • Linux
      • Android
    • Dependency Information
  • Fundamentals
    • What is the Kernel?
    • What is Nitrocid KS?
    • Simulated Kernel Features
      • Extra Features
        • More Networking
          • FTP Client
          • SSH Connection
          • SFTP Client
          • RSS Client
          • HTTP Client
          • Mail Client
        • Games and Amusements
          • Hangman
          • BackRace
          • Meteor
          • Pong
          • Russian Roulette
          • ShipDuet
          • Snaker
          • Solver
          • SpeedPress
          • Wordle
        • More Editors
          • JSON Editor
          • SQL Editor
        • Common Programs
          • Archive
          • Caffeine
          • Calendar
          • Calculator
          • Contacts
          • Dictionary
          • Git Shell
          • Notes
          • Stocks
          • Timers
          • To-do List
          • Unit Converter
          • Weather
        • Docking
        • Language Studio
        • Theme Studio
      • Accounts
        • Groups
        • Permissions
      • Editors
        • Text Editor
        • Hex Editor
      • Shells
        • Commands List
        • Addon Commands List
      • Files and Folders
        • Hashing and Encryption
      • The Nitrocid Homepage
      • Networking
      • Localization
      • Screensavers
      • Lockscreen Widgets
      • Audio Cues
  • Advanced and Power Users
    • Building the Kernel
      • Building on Windows
      • Building on macOS
      • Building on Linux
      • Building on Android
    • Kernel Modifications
      • Building your Mod
      • Analyzing your Mod
        • Text - NKS0001
        • ConsoleBase - NKS0002
        • ConsoleBase - NKS0003
        • ConsoleBase - NKS0004
        • ConsoleBase - NKS0005
        • ConsoleBase - NKS0006
        • ConsoleBase - NKS0007
        • ConsoleBase - NKS0008
        • ConsoleBase - NKS0009
        • Files - NKS0010
        • Files - NKS0011
        • Files - NKS0012
        • Files - NKS0013
        • Files - NKS0014
        • Files - NKS0015
        • Files - NKS0016
        • Files - NKS0017
        • Files - NKS0018
        • Files - NKS0019
        • Files - NKS0020
        • Files - NKS0021
        • Files - NKS0022
        • Files - NKS0023
        • Kernel - NKS0024
        • Kernel - NKS0025
        • Kernel - NKS0026
        • Kernel - NKS0027
        • Kernel - NKS0031
        • Kernel - NKS0032
        • Kernel - NKS0033
        • Kernel - NKS0037
        • Kernel - NKS0038
        • Kernel - NKS0039
        • Kernel - NKS0040
        • Kernel - NKS0041
        • Kernel - NKS0042
        • Kernel - NKS0043
        • Kernel - NKS0052
        • Kernel - NKS0053
        • Languages - NKS0044
        • Languages - NKS0045
        • Languages - NKS0046
        • Network - NKS0051
        • Text - NKS0047
        • Text - NKS0048
        • Text - NKS0049
        • Text - NKS0050
        • Text - NKS0054
        • Text - NKS0055
      • Managing your Mod
        • Inter-Mod Communication
        • Inter-Addon Communication
    • Diagnostics
      • Debugging
        • Local Debugging
        • Remote Debugging
      • Testing
      • Other Diagnostics
    • Bootloader
      • Boot Choices
      • Kernel Environments
      • Custom Boot Styles
    • Inner Workings
      • Kernel Settings
        • Mechanics of Settings App
        • Settings Format
        • Custom Settings
      • Shell Structure
        • Help System
        • Command Parsing
        • Command Information
        • Command Switches
        • Shell History
        • Shell Scripting
        • Shell Presets
        • Extra Shell Features
      • Multilingual Kernel
        • Locale Tools
        • Custom Languages
      • Inner Essentials
        • Kernel Drivers
          • Console Drivers
          • Debug Logger Drivers
          • Encoding Drivers
          • Encryption Drivers
          • Filesystem Drivers
          • Hardware Prober Drivers
          • Input Drivers
          • Network Drivers
          • RNG Drivers
          • Regular Expression Drivers
          • Sorting Drivers
        • Kernel Placeholders
        • The Permissions
        • The Users
        • Kernel Threads
        • Kernel Arguments
        • Kernel Journaling
        • Remote Procedure
        • Nitrocid Filesystem
        • Screensaver Internals
        • Splash Internals
        • Kernel Platform
        • Theme Internals
        • Color Internals
        • Privacy Consents
        • System Notifications
        • MAL and MOTD
        • Progress Handlers
        • Assembly Signing
        • Assembly Reflection
        • Random Number Generation
        • Network Tools
        • Date and Time
        • Mod Manual Pages
      • Miscellaneous APIs
  • Project Dependencies
  • Report an issue
  • Source code
  • API Reference
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  1. Advanced and Power Users
  2. Inner Workings
  3. Shell Structure

Help System

Inner workings of the help system

Last updated 7 months ago

The help system is what every shell uses, invoked by the unified help command available for every type of shell. The function responsible for showing help entries or command usage and some extra help is HelpSystem.ShowHelp() in the Nitrocid.Shell.ShellBase.Commands namespace. Explore with us the mechanics of the help system below.

General help

When the user requests the help command in any shell, the above function gets called, querying the current shell type (Shell.CurrentShellType) as discussed previously.

The function gets all the commands, including the unified ones, from the command type, but hides all the hidden commands (commands that are flagged with the CommandFlags.Hidden flag). It also takes care of the modded and aliased commands.

The help system then prints the list of commands to the console.

Some of the shells implement too many commands, potentially requiring you to either wrap its output using the wrap command, or turn on the simplified help from the kernel settings.

Command help

If the user specified a command when calling the help command, the help system extracts the help definition and all the command usages.

It extracts from these values found in the CommandInfo class:

  • HelpDefinition: The brief summary of what the command does

  • CommandArgumentInfo: The command argument info that supplies the below information:

    • .Arguments: Defines the command arguments

    • .Switches: Defines the command switches

    • .RenderedUsage: Defines the rendered usage to be printed for a command

The rendered usage has the following characteristics:

  • For required switches, they're surrounded with the < and the > marks. Switches that are not required are surrounded with the [ and the ] marks instead.

  • Switches that require values don't have the [ and the ] marks surrounding the =value part, indicating that the switch needs a value.

  • For required arguments, they're surrounded with the < and the > marks. Arguments that are not required are surrounded with the [ and the ] marks instead.

  • For numeric arguments, a marker is shown indicating that it only accepts numbers.

  • For switches that conflict, they're put in a group, such as [-switch1|-switch2].