Micro Shell library for small embedded systems with basic VT100 support

Description

MicroSH is platform independent command line shell for embedded systems, based on my remaster of microRL library by Helius. The library provides complete command interpretator for microRL command line to quickly and efficiently deploy the CLI on the target embedded device.

Features

• Platform independent command shell written in C language (C99)
• Flexible library configuration
  • Turn on/off feature for add functional/decrease memory via microsh_config.h and microsh_user_config.h config files
• No dynamic allocation
  • Maximum number of commands is assigned in configuration file
• Console sessions feature (optional)
  • Use a shell in multi-user mode with a different set of commands
• Permissive Apache 2.0 license

Getting started

Install

This repository uses Git Submodules to bring in dependent components.

• Open console and navigate to path in the system to clone repository to. Use command cd <path_to_lib>
• Clone repository
  To clone this repository using HTTPS:

  git clone https://github.com/dimmykar/microsh.git --recurse-submodules
  

  Using SSH:

  git clone git@github.com:dimmykar/microsh.git --recurse-submodules
  

  If you have downloaded repository without using the --recurse-submodules argument, you need to run:

  git submodule update --init --recursive
  

• Checkout to master branch for latest stable version or stay on develop branch for latest development version

Include library to the project

When the library is downloaded successfully, the next step is to add the library to the project, by means of source files to compiler inputs and header files in search path

• Copy microsh folder to your project, it contains library files
• Add microsh/src/include folder to include path of your toolchain. This is where C/C++ compiler can find the files during compilation process. Usually using -I flag
• Add source files from microsh/src/ folder to toolchain build. These files are built by C/C++ compiler
• Copy microsh/src/include/microsh/microsh_user_config_template.h to project folder and rename it to microsh_user_config.h
• Additionally, the microSH library requires the microRL library, whose files follow the same src/ and src/include pattern as the microSH library; its install instructions can be found here. Note that you need also to configure microRL library using microrl_user_config.h file and include it to your project together with microsh_user_config.h.

Library configuration

The list of configurations are available in the microsh_config.h file with default values. If any config value needs to be changed, specify values for these configuration values as follows:

• Define in microsh_user_config.h used by microSH
  OR
• Pass as compile time preprocessor macros

User configurations file microsh_user_config.h is used to overwrite default configuration values defined in microsh_config.h file without overwrite the file.

If you prefer to avoid using user configurations file, application must define a global symbol MICROSH_IGNORE_USER_CONFIGS and MICRORL_IGNORE_USER_CONFIGS, visible across entire application. This can be achieved with -D compiler option.

Minimal example

See examples in examples folder for minimal library usage.

Author: Dmitry Karasev aka dimmykar (karasevsdmitry@yandex.ru)
15.01.2022