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keiravillekodekeiravillekode
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Add bottle-song exercise (#242)
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‎config.json

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"prerequisites": [],
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"difficulty": 4
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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": "92fd7655-0e70-4f6d-9485-dbfbdce89dba",
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"practices": [],
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"prerequisites": [],
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"difficulty": 4
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},
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{
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"slug": "circular-buffer",
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"name": "Circular Buffer",

‎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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"keiravillekode"
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],
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"files": {
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"solution": [
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"bottle-song.v"
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],
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"test": [
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"run_test.v"
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],
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"example": [
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".meta/example.v"
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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.v

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module main
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import strings
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const numbers = ['No', 'One', 'Two', 'Three', 'Four', 'Five', 'Six', 'Seven', 'Eight', 'Nine',
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'Ten']
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fn append_line(mut builder strings.Builder, bottles int, lower bool) {
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if lower {
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builder.write_rune(numbers[bottles][0] | 32)
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builder.write_string(numbers[bottles][1..])
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} else {
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builder.write_string(numbers[bottles])
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}
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builder.write_string(' green bottle')
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if bottles != 1 {
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builder.write_rune(`s`)
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}
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builder.write_string(' hanging on the wall')
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}
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fn recite(start_bottles int, take_down int) string {
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mut builder := strings.new_builder(4000)
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mut bottles := start_bottles
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for bottles > start_bottles - take_down {
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append_line(mut &builder, bottles, false)
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builder.write_string(',\n')
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append_line(mut &builder, bottles, false)
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builder.write_string(',\n')
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builder.write_string("And if one green bottle should accidentally fall,\nThere'll be ")
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bottles--
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append_line(mut &builder, bottles, true)
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builder.write_string('.\n\n')
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}
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builder.go_back(2)
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return builder.str()
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}

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

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# This is an auto-generated file. Regular comments will be removed when this
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# file is regenerated. Regenerating will not touch any manually added keys,
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# so comments can be added in 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.v

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module main
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fn recite(start_bottles int, take_down int) string {
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}

‎exercises/practice/bottle-song/run_test.v

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module main
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fn test_verse__single_verse__first_generic_verse() {
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expected :=
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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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assert recite(10, 1) == expected
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}
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fn test_verse__single_verse__last_generic_verse() {
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expected :=
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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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assert recite(3, 1) == expected
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}
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fn test_verse__single_verse__verse_with_2_bottles() {
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expected :=
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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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assert recite(2, 1) == expected
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}
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fn test_verse__single_verse__verse_with_1_bottle() {
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expected :=
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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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assert recite(1, 1) == expected
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}
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fn test_lyrics__multiple_verses__first_two_verses() {
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expected :=
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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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assert recite(10, 2) == expected
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}
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fn test_lyrics__multiple_verses__last_three_verses() {
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expected :=
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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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assert recite(3, 3) == expected
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}
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fn test_lyrics__multiple_verses__all_verses() {
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expected :=
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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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assert recite(10, 10) == expected
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}

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