Package pager implements paging using commands "less" or "more", depending on availability.



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    func Main

    func Main(ctx context.Context, fn func(ctx context.Context, out io.WriteCloser) int) int

      Main implements paging using commands "less" or "more" if they are available. If os.Stdout is not terminal or less/more are not available in $PATH, Main calls fn with out set to os.Stdout and returns its exit code. Otherwise creates a pager subprocess, directs its stdout to os.Stdout and calls fn with out set to pager stdin. fn's context is canceled if the user quits pager.

      If fn returns non-zero exit code before pager exits, Main returns that exit code. Otherwise Main returns pager's exit code. It is a race between the user hitting q and fn failing.


      func main() int {
      	return Main(context.Background(), func(ctx context.Context, out io.WriteCloser) int {
      		for i := 0; i < 100000 && ctx.Err() == nil; i++ {
      			fmt.Fprintln(out, i)
      		return 0


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      Source Files