67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
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package beer
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import (
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"errors"
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"strconv"
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"strings"
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)
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// buildBase builds the basic "x bottle(s) of beer"
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func buildBase(num int) string {
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var ret string
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if num == 0 {
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ret = "No more"
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} else {
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ret = strconv.Itoa(num)
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}
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ret += " bottle"
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if num != 1 {
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ret += "s"
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}
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ret += " of beer"
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return ret
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}
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// Verse generates a single verse
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func Verse(num int) (string, error) {
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var ret string
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if num > 99 || num < 0 {
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return "", errors.New("Invalid verse requested")
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}
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ret += buildBase(num) + " on the wall, " + strings.ToLower(buildBase(num)) + ".\n"
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if num == 0 {
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ret += "Go to the store and buy some more, " + buildBase(99) + " on the wall.\n"
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} else {
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ret += "Take "
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if num == 1 {
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ret += "it "
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} else {
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ret += "one "
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}
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ret += "down and pass it around, " + strings.ToLower(buildBase(num-1)) + " on the wall.\n"
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}
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return ret, nil
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}
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// Verses generates all verses starting at 'st' and going to 'end'
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func Verses(st, end int) (string, error) {
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if st < end {
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return "", errors.New("Start less than stop")
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}
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var r, ret string
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var err error
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for i := st; i >= end; i-- {
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if r, err = Verse(i); err != nil {
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return "", err
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}
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ret += r + "\n"
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}
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return ret, nil
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}
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// Song generates the entire song (all 100 verses)
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func Song() string {
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r, _ := Verses(99, 0)
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return r
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}
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