crosstermion

Crosstermion is a utility crate to unify some types of both crates, allowing to easily build apps that use the leaner termion crate on unix systems, but resort to crossterm on windows systems.

Currently provided facilities are:

• a Key type an an input_stream (async) to receive key presses
• an AltenrativeRawTerminal which marries an alternative screen with raw mode
• a way to create a tui or tui-react terminal with either the crossterm or the termion backend.

But how to do colors and styles?

• With tui
  • When using the tui, you will have native cross-backend support for colors and styles.
• Without tui
  • Use the color feature for additional utilities for colors with ansi_term.
  • Otherwise, using ansi_term, colored or termcolor will work as expected.

How to build with crossterm on Windows and termion on Unix?

There seems to be no easy way, as cargo will always build dependencies even though they are not supposed to be used on your platform. This leads to both termion and crossterm to be built, which is fatal on Windows. Thus one will have to manually select feature toggles when creating a release build, i.e. one would have to exclude all functionality that requires TUIs by default, and let the user enable the features they require.

The compile_error!(…) macro can be useful to inform users if feature selection is required. Alternatively, assure that everything compiles even without any selected backend.

Lastly, one can always give in and always compile against crossterm.

Features

All features work additively, but in case they are mutually exclusive, for instance in case of tui-react and tui, or crossterm and termion, the more general one will be chosen.

• mutually exclusive
  • crossterm
    • provides Key conversion support from crossbeam::event::KeyEvent and an AlternativeRawTerminal
    • provides a threaded key input channel
    • additive
      • input-async-crossterm
        • adds native async capabilites to crossterm, which works without spawning an extra thread thanks to mio.
        • note that threaded key input is always supported.
  • termion
    • provides Key conversion support from termion::event::Key and an AlternativeRawTerminal
    • provides a threaded key input channel
    • additive
      • input-async
        • Spawn a thread and provide input events via a futures Stream
        • note that threaded key input is always supported.
• mutually exclusive
  • _using tui_ (mutually exclusive)
    • tui-termion implies termion feature
      • combines tui with termion and provides a tui::Terminal with termion backend
    • tui-crossterm implies crossterm feature
      • combines tui with crossterm and provides a tui::Terminal with crossterm backend
  • using tui-react (mutually exclusive)
    • tui-react-termion implies termion feature
      • combines tui-react with crossterm and provides a tui::Terminal with crossterm backend
    • tui-react-crossterm implies crossterm feature
      • combines tui-react with crossterm and provides a tui::Terminal with crossterm backend
• color
  • Add support for ansi_term based conditional coloring. The crate is small, to the point and allows zero-copy drawing of bytes and UTF-8 string, while supporting Windows 10 as well.
• cursor movement
  • mutually exclusive
    • crossterm
      • Implements cursor movement with crossterm
    • termion
      • Implements cursor movement with termion