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Add twelve-days (#338)
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‎config.json

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"logic"
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]
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},
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{
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"slug": "twelve-days",
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"name": "Twelve Days",
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"uuid": "c3493cdc-f5e6-4651-a311-e7855163ca79",
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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": "two-fer",
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"name": "Two-Fer",

‎exercises/practice/twelve-days/.docs/instructions.md

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# Instructions
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Your task in this exercise is to write code that returns the lyrics of the song: "The Twelve Days of Christmas."
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"The Twelve Days of Christmas" is a common English Christmas carol.
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Each subsequent verse of the song builds on the previous verse.
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The lyrics your code returns should _exactly_ match the full song text shown below.
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## Lyrics
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```text
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On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.
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On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.
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On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
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```

‎exercises/practice/twelve-days/.meta/config.json

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{
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"authors": [
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"BNAndras"
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],
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"files": {
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"solution": [
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"twelve_days.vim"
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],
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"test": [
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"twelve_days.vader"
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],
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"example": [
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".meta/example.vim"
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]
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},
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"blurb": "Output the lyrics to 'The Twelve Days of Christmas'.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)"
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}

‎exercises/practice/twelve-days/.meta/example.vim

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let s:gifts = [
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\ 'a Partridge in a Pear Tree.',
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\ 'two Turtle Doves,',
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\ 'three French Hens,',
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\ 'four Calling Birds,',
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\ 'five Gold Rings,',
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\ 'six Geese-a-Laying,',
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\ 'seven Swans-a-Swimming,',
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\ 'eight Maids-a-Milking,',
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\ 'nine Ladies Dancing,',
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\ 'ten Lords-a-Leaping,',
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\ 'eleven Pipers Piping,',
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\ 'twelve Drummers Drumming,']
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let s:ordinals = [
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\ 'first',
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\ 'second',
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\ 'third',
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\ 'fourth',
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\ 'fifth',
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\ 'sixth',
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\ 'seventh',
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\ 'eighth',
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\ 'ninth',
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\ 'tenth',
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\ 'eleventh',
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\ 'twelfth']
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function! Recite(startVerse, endVerse) abort
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let l:verses = []
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for l:current in range(a:startVerse, a:endVerse)
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let l:availableGifts = reverse(s:gifts[0:l:current-1])
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if l:current > 1
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let l:availableGifts[-1] = 'and ' . l:availableGifts[-1]
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endif
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let l:verse = 'On the ' . s:ordinals[l:current - 1] . ' day of Christmas my true love gave to me: ' . join(l:availableGifts, ' ')
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call add(l:verses, l:verse)
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endfor
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return join(l:verses, '\n')
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endfunction

‎exercises/practice/twelve-days/.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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[c0b5a5e6-c89d-49b1-a6b2-9f523bff33f7]
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description = "verse -> first day a partridge in a pear tree"
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[1c64508a-df3d-420a-b8e1-fe408847854a]
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description = "verse -> second day two turtle doves"
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[a919e09c-75b2-4e64-bb23-de4a692060a8]
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description = "verse -> third day three french hens"
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[9bed8631-ec60-4894-a3bb-4f0ec9fbe68d]
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description = "verse -> fourth day four calling birds"
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[cf1024f0-73b6-4545-be57-e9cea565289a]
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description = "verse -> fifth day five gold rings"
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[50bd3393-868a-4f24-a618-68df3d02ff04]
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description = "verse -> sixth day six geese-a-laying"
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[8f29638c-9bf1-4680-94be-e8b84e4ade83]
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description = "verse -> seventh day seven swans-a-swimming"
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[7038d6e1-e377-47ad-8c37-10670a05bc05]
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description = "verse -> eighth day eight maids-a-milking"
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[37a800a6-7a56-4352-8d72-0f51eb37cfe8]
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description = "verse -> ninth day nine ladies dancing"
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[10b158aa-49ff-4b2d-afc3-13af9133510d]
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description = "verse -> tenth day ten lords-a-leaping"
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[08d7d453-f2ba-478d-8df0-d39ea6a4f457]
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description = "verse -> eleventh day eleven pipers piping"
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[0620fea7-1704-4e48-b557-c05bf43967f0]
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description = "verse -> twelfth day twelve drummers drumming"
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[da8b9013-b1e8-49df-b6ef-ddec0219e398]
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description = "lyrics -> recites first three verses of the song"
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[c095af0d-3137-4653-ad32-bfb899eda24c]
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description = "lyrics -> recites three verses from the middle of the song"
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[20921bc9-cc52-4627-80b3-198cbbfcf9b7]
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description = "lyrics -> recites the whole song"

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