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task/internal/output/group.go
Andrey Nering e36c77aaf3 Fix bug with STDOUT and STDERR in the "group" output mode
Took the oportunity to refactor a bit how we handle closing of the streams.

Fixes #779
2022-07-06 10:45:07 -03:00

45 lines
895 B
Go

package output
import (
"bytes"
"io"
)
type Group struct {
Begin, End string
}
func (g Group) WrapWriter(stdOut, _ io.Writer, _ string, tmpl Templater) (io.Writer, io.Writer, CloseFunc) {
gw := &groupWriter{writer: stdOut}
if g.Begin != "" {
gw.begin = tmpl.Replace(g.Begin) + "\n"
}
if g.End != "" {
gw.end = tmpl.Replace(g.End) + "\n"
}
return gw, gw, func() error { return gw.close() }
}
type groupWriter struct {
writer io.Writer
buff bytes.Buffer
begin, end string
}
func (gw *groupWriter) Write(p []byte) (int, error) {
return gw.buff.Write(p)
}
func (gw *groupWriter) close() error {
if gw.buff.Len() == 0 {
// don't print begin/end messages if there's no buffered entries
return nil
}
if _, err := io.WriteString(gw.writer, gw.begin); err != nil {
return err
}
gw.buff.WriteString(gw.end)
_, err := io.Copy(gw.writer, &gw.buff)
return err
}