DisplayWidth calculates what the rendered width of a string may be.

Panic pretty print the error and exit with status code 1.

Truncate shortens a string to fit the maximum display width.

TruncateColumn replaces the first new line character with an ellipsis and shortens a string to fit the maximum display width.

CancelError signals user-initiated cancellation.

SilentError is an error that triggers exit code 1 without any error messaging.

FlagError is the kind of error raised in flag processing.