bottle_song

elixir/bottle-song/.exercism/config.json

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

elixir/bottle-song/.exercism/metadata.json

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+{"track":"elixir","exercise":"bottle-song","id":"0826bdf779e94ea6bc38fc08189a0e97","url":"https://exercism.org/tracks/elixir/exercises/bottle-song","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/bottle-song/.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

elixir/bottle-song/.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+bottle_song-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

elixir/bottle-song/HELP.md

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+# Help
+
+## Running the tests
+
+From the terminal, change to the base directory of the exercise then execute the tests with:
+
+```bash
+$ mix test
+```
+
+This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
+
+Documentation:
+
+* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
+* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
+
+## Pending tests
+
+In test suites of practice exercises, all but the first test have been tagged to be skipped.
+
+Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
+
+For example:
+
+```elixir
+# @tag :pending
+test "shouting" do
+  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
+end
+```
+
+If you wish to run all tests at once, you can include all skipped test by using the `--include` flag on the `mix test` command:
+
+```bash
+$ mix test --include pending
+```
+
+Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
+
+```elixir
+# ExUnit.configure(exclude: :pending, trace: true)
+```
+
+## Useful `mix test` options
+
+* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
+* `--failed` - runs only tests that failed the last time they ran
+* `--max-failures` - the suite stops evaluating tests when this number of test failures
+is reached
+* `--seed 0` - disables randomization so the tests in a single file will always be ran
+in the same order they were defined in
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit lib/bottle_song.ex` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
+- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/elixir/resources) out there where answers might be found.

elixir/bottle-song/README.md

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+# Bottle Song
+
+Welcome to Bottle Song on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Recite the lyrics to that popular children's repetitive song: Ten Green Bottles.
+
+Note that not all verses are identical.
+
+```text
+Ten green bottles hanging on the wall,
+Ten green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be nine green bottles hanging on the wall.
+
+Nine green bottles hanging on the wall,
+Nine green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be eight green bottles hanging on the wall.
+
+Eight green bottles hanging on the wall,
+Eight green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be seven green bottles hanging on the wall.
+
+Seven green bottles hanging on the wall,
+Seven green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be six green bottles hanging on the wall.
+
+Six green bottles hanging on the wall,
+Six green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be five green bottles hanging on the wall.
+
+Five green bottles hanging on the wall,
+Five green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be four green bottles hanging on the wall.
+
+Four green bottles hanging on the wall,
+Four green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be three green bottles hanging on the wall.
+
+Three green bottles hanging on the wall,
+Three green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be two green bottles hanging on the wall.
+
+Two green bottles hanging on the wall,
+Two green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be one green bottle hanging on the wall.
+
+One green bottle hanging on the wall,
+One green bottle hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be no green bottles hanging on the wall.
+```
+
+## Source
+
+### Created by
+
+- @antoine-duchenet
+
+### Based on
+
+Wikipedia - https://en.wikipedia.org/wiki/Ten_Green_Bottles

elixir/bottle-song/lib/bottle_song.ex

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+defmodule BottleSong do
+  @moduledoc """
+  Handles lyrics of the popular children song: Ten Green Bottles
+  """
+
+  defp verse(n) do
+    bottle_sense = fn
+      0 -> "No green bottles"
+      1 -> "One green bottle"
+      2 -> "Two green bottles"
+      3 -> "Three green bottles"
+      4 -> "Four green bottles"
+      5 -> "Five green bottles"
+      6 -> "Six green bottles"
+      7 -> "Seven green bottles"
+      8 -> "Eight green bottles"
+      9 -> "Nine green bottles"
+      10 -> "Ten green bottles"
+    end
+
+    "#{bottle_sense.(n)} hanging on the wall,\n#{bottle_sense.(n)} hanging on the wall,\nAnd if one green bottle should accidentally fall,\nThere'll be #{String.downcase(bottle_sense.(n-1))} hanging on the wall."
+  end
+
+  @spec recite(pos_integer, pos_integer) :: String.t()
+  def recite(start_bottle, take_down) do
+    Enum.map_join(0..(take_down - 1), "\n\n", &verse(start_bottle - &1))
+  end
+end

elixir/bottle-song/mix.exs

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+defmodule BottleSong.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :bottle_song,
+      version: "1.0.0",
+      elixir: "~> 1.10",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

elixir/bottle-song/test/bottle_song_test.exs

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+defmodule BottleSongTest do
+  use ExUnit.Case
+
+  describe "[Single verse]" do
+    test "First generic verse" do
+      assert BottleSong.recite(10, 1) ==
+               """
+               Ten green bottles hanging on the wall,
+               Ten green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be nine green bottles hanging on the wall.\
+               """
+    end
+
+    test "Last generic verse" do
+      assert BottleSong.recite(3, 1) ==
+               """
+               Three green bottles hanging on the wall,
+               Three green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be two green bottles hanging on the wall.\
+               """
+    end
+
+    test "Verse with 2 bottles" do
+      assert BottleSong.recite(2, 1) ==
+               """
+               Two green bottles hanging on the wall,
+               Two green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be one green bottle hanging on the wall.\
+               """
+    end
+
+    test "Verse with 1 bottle" do
+      assert BottleSong.recite(1, 1) ==
+               """
+               One green bottle hanging on the wall,
+               One green bottle hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be no green bottles hanging on the wall.\
+               """
+    end
+  end
+
+  describe "[Multiple verses]" do
+    test "First two verses" do
+      assert BottleSong.recite(10, 2) ==
+               """
+               Ten green bottles hanging on the wall,
+               Ten green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be nine green bottles hanging on the wall.
+
+               Nine green bottles hanging on the wall,
+               Nine green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be eight green bottles hanging on the wall.\
+               """
+    end
+
+    test "Last three verses" do
+      assert BottleSong.recite(3, 3) ==
+               """
+               Three green bottles hanging on the wall,
+               Three green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be two green bottles hanging on the wall.
+
+               Two green bottles hanging on the wall,
+               Two green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be one green bottle hanging on the wall.
+
+               One green bottle hanging on the wall,
+               One green bottle hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be no green bottles hanging on the wall.\
+               """
+    end
+
+    test "All verses" do
+      assert BottleSong.recite(10, 10) ==
+               """
+               Ten green bottles hanging on the wall,
+               Ten green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be nine green bottles hanging on the wall.
+
+               Nine green bottles hanging on the wall,
+               Nine green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be eight green bottles hanging on the wall.
+
+               Eight green bottles hanging on the wall,
+               Eight green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be seven green bottles hanging on the wall.
+
+               Seven green bottles hanging on the wall,
+               Seven green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be six green bottles hanging on the wall.
+
+               Six green bottles hanging on the wall,
+               Six green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be five green bottles hanging on the wall.
+
+               Five green bottles hanging on the wall,
+               Five green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be four green bottles hanging on the wall.
+
+               Four green bottles hanging on the wall,
+               Four green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be three green bottles hanging on the wall.
+
+               Three green bottles hanging on the wall,
+               Three green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be two green bottles hanging on the wall.
+
+               Two green bottles hanging on the wall,
+               Two green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be one green bottle hanging on the wall.
+
+               One green bottle hanging on the wall,
+               One green bottle hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be no green bottles hanging on the wall.\
+               """
+    end
+  end
+end

elixir/bottle-song/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)