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Implement Exercise Bottle Song (#148)
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‎config.json‎

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"prerequisites": [],
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"difficulty": 2
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},
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{
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"slug": "bottle-song",
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"name": "Bottle Song",
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"uuid": "7de07a09-8554-4521-99a7-24a4c051196e",
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"practices": [],
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"prerequisites": [],
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"difficulty": 2
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},
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{
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"slug": "clock",
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"name": "Clock",

‎exercises/practice/bottle-song/.docs/instructions.md‎

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# Instructions
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Recite the lyrics to that popular children's repetitive song: Ten Green Bottles.
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Note that not all verses are identical.
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```text
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Ten green bottles hanging on the wall,
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Ten green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be nine green bottles hanging on the wall.
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Nine green bottles hanging on the wall,
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Nine green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be eight green bottles hanging on the wall.
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Eight green bottles hanging on the wall,
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Eight green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be seven green bottles hanging on the wall.
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Seven green bottles hanging on the wall,
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Seven green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be six green bottles hanging on the wall.
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Six green bottles hanging on the wall,
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Six green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be five green bottles hanging on the wall.
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Five green bottles hanging on the wall,
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Five green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be four green bottles hanging on the wall.
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Four green bottles hanging on the wall,
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Four green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be three green bottles hanging on the wall.
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Three green bottles hanging on the wall,
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Three green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be two green bottles hanging on the wall.
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Two green bottles hanging on the wall,
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Two green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be one green bottle hanging on the wall.
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One green bottle hanging on the wall,
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One green bottle hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be no green bottles hanging on the wall.
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```

‎exercises/practice/bottle-song/.meta/config.json‎

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{
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"authors": [
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"rmonnet"
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],
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"files": {
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"solution": [
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"bottle_song.odin"
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],
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"test": [
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"bottle_song_test.odin"
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],
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"example": [
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".meta/example.odin"
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]
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},
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"blurb": "Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/Ten_Green_Bottles"
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}

‎exercises/practice/bottle-song/.meta/example.odin‎

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package bottle_song
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import "core:fmt"
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recite :: proc(start_bottles, take_down: int) -> []string {
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num_verses := take_down * 4 + (take_down - 1)
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song := make([dynamic]string, 0, num_verses)
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for i := 0; i < take_down; i += 1 {
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n := start_bottles - i
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// Need an empty line to separate paragraphs.
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if i > 0 {
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// This seems redundant, but if we don't have all the strings in the `[]string`
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// dynamically allocated, the `delete()` in the caller is having a hard time
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// figuring out which ones to free and which ones not to, resulting in a `bad free` warning.
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append(&song, fmt.aprintf(""))
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}
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verse1 := fmt.aprintf("%s green bottle%s hanging on the wall,", cap_nums[n], plural(n))
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append(&song, verse1)
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verse2 := fmt.aprintf("%s green bottle%s hanging on the wall,", cap_nums[n], plural(n))
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append(&song, verse2)
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// Same comment as for "" being dynamic above.
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verse3 := fmt.aprintf("And if one green bottle should accidentally fall,")
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append(&song, verse3)
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verse4 := fmt.aprintf(
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"There'll be %s green bottle%s hanging on the wall.",
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nums[n - 1],
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plural(n - 1),
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)
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append(&song, verse4)}
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return song[:]
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}
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plural :: proc(n: int) -> string {
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// We only use "bottle" (singular) for one (not "no bottles").
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if n == 1 { return "" }
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return "s"
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}
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nums := [?]string {
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"no",
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"one",
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"two",
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"three",
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"four",
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"five",
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"six",
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"seven",
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"eight",
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"nine",
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"ten",
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}
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cap_nums := [?]string {
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"No",
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"One",
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"Two",
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"Three",
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"Four",
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"Five",
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"Six",
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"Seven",
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"Eight",
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"Nine",
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"Ten",
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}

‎exercises/practice/bottle-song/.meta/tests.toml‎

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[d4ccf8fc-01dc-48c0-a201-4fbeb30f2d03]
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description = "verse -> single verse -> first generic verse"
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[0f0aded3-472a-4c64-b842-18d4f1f5f030]
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description = "verse -> single verse -> last generic verse"
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[f61f3c97-131f-459e-b40a-7428f3ed99d9]
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description = "verse -> single verse -> verse with 2 bottles"
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[05eadba9-5dbd-401e-a7e8-d17cc9baa8e0]
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description = "verse -> single verse -> verse with 1 bottle"
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[a4a28170-83d6-4dc1-bd8b-319b6abb6a80]
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description = "lyrics -> multiple verses -> first two verses"
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[3185d438-c5ac-4ce6-bcd3-02c9ff1ed8db]
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description = "lyrics -> multiple verses -> last three verses"
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[28c1584a-0e51-4b65-9ae2-fbc0bf4bbb28]
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description = "lyrics -> multiple verses -> all verses"

‎exercises/practice/bottle-song/bottle_song.odin‎

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package bottle_song
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recite :: proc(start_bottles, take_down: int) -> []string {
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// Implement the procedure.
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return nil
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}

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