func lineNumber(c *ansi.Colorer, buf *bytes.Buffer, n int, hasMatch bool) string {
defer buf.Reset()
s := fmt.Sprintf("%d", n)
buf.WriteString(c.Fg(s, ansi.Yellow, ansi.Bold))
if hasMatch {
buf.WriteByte(':')
} else {
buf.WriteByte('-')
}
for i := len(s); i < 6; i++ {
buf.WriteByte(' ')
}
return buf.String()
}
func hiliteMatches(c *ansi.Colorer, p *regexp.Regexp, line string) string {
// find the indexes for all matches
idxs := p.FindAllStringIndex(line, -1)
var buf bytes.Buffer
beg := 0
for _, idx := range idxs {
// for each match add the contents before the match ...
buf.WriteString(line[beg:idx[0]])
// and the highlighted version of the match
buf.WriteString(c.FgBg(line[idx[0]:idx[1]],
ansi.Black,
ansi.Bold,
ansi.Yellow,
ansi.Intense))
beg = idx[1]
}
buf.WriteString(line[beg:])
return buf.String()
}