Crate vterm 

vterm: a minimal terminal-emulator core, on the Rust standard library plus the nativelite ansi crate alone. Zero third-party dependencies.

One concern: turn a child process’s VT output byte stream into a live ansi::Screen you can composite and diff. Term::feed drives an internal ansi::Parser and applies the resulting tokens (cursor motion, erase, scroll region, SGR style, autowrap, alt-screen) to a cell grid. Term::screen hands back the active buffer, cursor included, ready for Screen::diff compositing.

let mut t = vterm::Term::new(24, 80);
t.feed(b"\x1b[2J\x1b[3;5HX");   // clear, cursor to row 3 col 5, print 'X'
let s = t.screen();
assert_eq!(s.cell(2, 4).ch, 'X');
assert_eq!(s.cursor(), ansi::Cursor::new(2, 5)); // advanced past the 'X'

This is a correct common core, not a pixel-perfect xterm. Double-width (CJK, emoji) glyphs are laid out as two-column cells; combining marks, sixel/images, mouse reporting, and exotic private modes are deliberately out of scope (see the README’s fidelity boundaries); the host app’s answer for those is raw passthrough (atrium’s “zoom”).

There is no I/O here: no PTY, no raw mode. vterm turns bytes into a screen; feeding it child output and painting its screen are the caller’s job (see pty and atrium).

Structs

Term

A minimal VT100/ECMA-48 terminal emulator over an ansi::Screen.