util

func Check ¶

func Check(msg string, err error)

Check reports the error fatally if it's non-nil.

func DropLeadingNumbers ¶

func DropLeadingNumbers(s string) string

DropLeadingNumbers drops leading numbers and underscores.

func GetProcesssGroupID ¶ added in v0.2.2

func GetProcesssGroupID(pid int) (int, error)

GetProcesssGroupID purports to get a process group Id common to all subprocesses of its pid argument.

There should be a better way to do this.

Goal is to be able to support killing any subprocesses created by RunInSubShell. At the moment, its up to authors to clean up after themselves.

func Lissajous ¶

func Lissajous(out io.Writer, size, cycles, nframes int)

Lissajous returns an image. image canvas covers [-size..+size] nframes is number of animation frames cycles is number of complete x oscillator revolutions

func SampleString ¶

func SampleString(incoming string, max int) string

SampleString converts a long multi-line string to a short one-line sample.

func Spaces ¶

func Spaces(n int) string

Spaces returns a string of length n with only spaces.