Fix line rendering - Githubissues

chelnak / ysmrr

YSMRR is a package that provides simple multi-line compatible spinners for Go applications.

MIT License

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Fix line rendering #23

Closed chelnak closed 1 year ago

chelnak commented 1 year ago

This PR fixes a bug so that we will no longer encounter rendering issues when the application starts at the bottom of a terminal.

Two new commands have been added to the tput package:

Cuu - moves the cursor up by n lines
BufScreen - print n * newline characters to the writer.

The manager now consumes the new tput commands so that we can always ensure that there is enough space to render our spinners.

Essentially before rendering starts we:

Hide the cursor
Print len(sm.spinners) * \n
Move the cursor up len(sm.spinners)
Save the cursor position