vt_output: Simulate (a subset of) a VT-5xx ANSI terminal

In cli: Helpers for Developing Command Line Interfaces

Simulate (a subset of) a VT-5xx ANSI terminal

Description

This is utility function that calculates the state of a VT-5xx screen after a certain set of output.

Usage

vt_output(output, width = 80L, height = 25L)

Arguments

output	Character vector or raw vector. Character vectors are collapsed (without a separater), and converted to a raw vector using base::charToRaw().
width	Terminal width.
height	Terminal height.

Details

Currently it supports:

• configurable terminal width and height

• ASCII printable characters.

• ⁠\n⁠, ⁠\r⁠.

• ANSI SGR colors, 8 color mode, 256 color mode and true color mode.

• Other ANSI SGR features: bold, italic, underline, strikethrough, blink, inverse.

It does not currently supports other features, mode notably:

• Other ANSI control sequences and features. Other control sequences are silently ignored.

• Wide Unicode characters. Their width is not taken into account correctly.

• Unicode graphemes.

Value

Data frame with columns lineno, segmentno, segment, attributes.

Note

This function is experimental, and the virtual temrinal API will likely change in future versions of cli.

cli documentation built on March 31, 2023, 9:04 p.m.