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| package main
import (
"fmt"
"os"
"sort"
"text/tabwriter"
"time"
)
type Track struct {
Title string
Artist string
Album string
Year int
Length time.Duration
}
var tracks = []*Track{
{"Go", "Delilah", "From the Roots Up", 2012, length("3m38s")},
{"Go", "Moby", "Moby", 1992, length("3m37s")},
{"Go Ahead", "Alicia Keys", "As I Am", 2007, length("4m36s")},
{"Ready 2 Go", "Martin Solveig", "Smash", 2011, length("4m24s")},
}
func length(s string) time.Duration {
d, err := time.ParseDuration(s)
if err != nil {
panic(s)
}
return d
}
func printTracks(tracks []*Track) {
const format = "%v\t%v\t%v\t%v\t%v\t\n"
tw := new(tabwriter.Writer).Init(os.Stdout, 0, 8, 2, ' ', 0)
fmt.Fprintf(tw, format, "Title", "Artist", "Album", "Year", "Length")
fmt.Fprintf(tw, format, "-----", "------", "-----", "----", "------")
for _, t := range tracks {
fmt.Fprintf(tw, format, t.Title, t.Artist, t.Album, t.Year, t.Length)
}
tw.Flush() // calculate column widths and print table
}
type byArtist []*Track
func (x byArtist) Len() int { return len(x) }
func (x byArtist) Less(i, j int) bool { return x[i].Artist < x[j].Artist }
func (x byArtist) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func main(){
sort.Sort(byArtist(tracks))
printTracks(tracks)
}
|
Kendrick