bottles...

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

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+{
+  "authors": [
+    "ellnix"
+  ],
+  "files": {
+    "solution": [
+      "src/lib.rs",
+      "Cargo.toml"
+    ],
+    "test": [
+      "tests/bottle_song.rs"
+    ],
+    "example": [
+      ".meta/example.rs"
+    ]
+  },
+  "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"
+}

rust/bottle-song/.gitignore

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+/target
+Cargo.lock

rust/bottle-song/Cargo.toml

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+[package]
+name = "bottle_song"
+version = "0.1.0"
+edition = "2024"
+
+# Not all libraries from crates.io are available in Exercism's test runner.
+# The full list of available libraries is here:
+# https://github.com/exercism/rust-test-runner/blob/main/local-registry/Cargo.toml
+[dependencies]

rust/bottle-song/HELP.md

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+# Help
+
+## Running the tests
+
+Execute the tests with:
+
+```bash
+$ cargo test
+```
+
+All but the first test have been ignored. After you get the first test to
+pass, open the tests source file which is located in the `tests` directory
+and remove the `#[ignore]` flag from the next test and get the tests to pass
+again. Each separate test is a function with `#[test]` flag above it.
+Continue, until you pass every test.
+
+If you wish to run _only ignored_ tests without editing the tests source file, use:
+
+```bash
+$ cargo test -- --ignored
+```
+
+If you are using Rust 1.51 or later, you can run _all_ tests with
+
+```bash
+$ cargo test -- --include-ignored
+```
+
+To run a specific test, for example `some_test`, you can use:
+
+```bash
+$ cargo test some_test
+```
+
+If the specific test is ignored, use:
+
+```bash
+$ cargo test some_test -- --ignored
+```
+
+To learn more about Rust tests refer to the online [test documentation][rust-tests].
+
+[rust-tests]: https://doc.rust-lang.org/book/ch11-02-running-tests.html
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/lib.rs Cargo.toml` 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 [Rust track's documentation](https://exercism.org/docs/tracks/rust)
+- The [Rust track's programming category on the forum](https://forum.exercism.org/c/programming/rust)
+- [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.
+
+## Rust Installation
+
+Refer to the [exercism help page][help-page] for Rust installation and learning
+resources.
+
+## Submitting the solution
+
+Generally you should submit all files in which you implemented your solution (`src/lib.rs` in most cases). If you are using any external crates, please consider submitting the `Cargo.toml` file. This will make the review process faster and clearer.
+
+## Feedback, Issues, Pull Requests
+
+Head to [the forum](https://forum.exercism.org/c/programming/rust/) and create a post to provide feedback about an exercise or if you want to help implement new exercises.
+Members of the rust track team are happy to help!
+
+The GitHub [track repository][github] is the home for all of the Rust exercises.
+
+If you want to know more about Exercism, take a look at the [contribution guide].
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+
+[help-page]: https://exercism.org/tracks/rust/learning
+[github]: https://github.com/exercism/rust
+[contribution guide]: https://exercism.org/docs/community/contributors

rust/bottle-song/README.md

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+# Bottle Song
+
+Welcome to Bottle Song on Exercism's Rust 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
+
+- @ellnix
+
+### Based on
+
+Wikipedia - https://en.wikipedia.org/wiki/Ten_Green_Bottles

rust/bottle-song/src/lib.rs

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+pub fn recite(start_bottles: u32, take_down: u32) -> String {
+    let end_bottles = start_bottles - take_down;
+    
+    ((end_bottles + 1)..=start_bottles)
+        .rev()
+        .map(|n| verse(n))
+        .collect::<Vec<_>>()
+        .join("\n\n")
+}
+
+fn verse(n: u32) -> String {
+    let current_bottle = bottle_str(n);
+    let next_bottle = bottle_str(n - 1).to_lowercase();
+
+    format!(
+        "{0} hanging on the wall,\n\
+         {0} hanging on the wall,\n\
+         And if one green bottle should accidentally fall,\n\
+         There'll be {1} hanging on the wall.",
+        current_bottle, next_bottle
+    )
+}
+
+fn bottle_str(n: u32) -> String {
+    let count_str = match n {
+        10 => "Ten", 9 => "Nine", 8 => "Eight", 7 => "Seven", 6 => "Six",
+        5 => "Five", 4 => "Four", 3 => "Three", 2 => "Two", 1 => "One",
+        _ => "No",
+    };
+
+    let plural = if n == 1 { "bottle" } else { "bottles" };
+    
+    format!("{count_str} green {plural}")
+}

rust/bottle-song/tests/bottle_song.rs

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+use bottle_song::*;
+
+#[test]
+fn first_generic_verse() {
+    assert_eq!(
+        recite(10, 1).trim(),
+        concat!(
+            "Ten green bottles hanging on the wall,\n",
+            "Ten green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be nine green bottles hanging on the wall.",
+        )
+    );
+}
+
+#[test]
+fn last_generic_verse() {
+    assert_eq!(
+        recite(3, 1).trim(),
+        concat!(
+            "Three green bottles hanging on the wall,\n",
+            "Three green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be two green bottles hanging on the wall.",
+        )
+    );
+}
+
+#[test]
+fn verse_with_2_bottles() {
+    assert_eq!(
+        recite(2, 1).trim(),
+        concat!(
+            "Two green bottles hanging on the wall,\n",
+            "Two green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be one green bottle hanging on the wall.",
+        )
+    );
+}
+
+#[test]
+fn verse_with_1_bottle() {
+    assert_eq!(
+        recite(1, 1).trim(),
+        concat!(
+            "One green bottle hanging on the wall,\n",
+            "One green bottle hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be no green bottles hanging on the wall.",
+        )
+    );
+}
+
+#[test]
+fn first_two_verses() {
+    assert_eq!(
+        recite(10, 2).trim(),
+        concat!(
+            "Ten green bottles hanging on the wall,\n",
+            "Ten green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be nine green bottles hanging on the wall.\n",
+            "\n",
+            "Nine green bottles hanging on the wall,\n",
+            "Nine green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be eight green bottles hanging on the wall.",
+        )
+    );
+}
+
+#[test]
+fn last_three_verses() {
+    assert_eq!(
+        recite(3, 3).trim(),
+        concat!(
+            "Three green bottles hanging on the wall,\n",
+            "Three green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be two green bottles hanging on the wall.\n",
+            "\n",
+            "Two green bottles hanging on the wall,\n",
+            "Two green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be one green bottle hanging on the wall.\n",
+            "\n",
+            "One green bottle hanging on the wall,\n",
+            "One green bottle hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be no green bottles hanging on the wall.",
+        )
+    );
+}
+
+#[test]
+fn all_verses() {
+    assert_eq!(
+        recite(10, 10).trim(),
+        concat!(
+            "Ten green bottles hanging on the wall,\n",
+            "Ten green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be nine green bottles hanging on the wall.\n",
+            "\n",
+            "Nine green bottles hanging on the wall,\n",
+            "Nine green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be eight green bottles hanging on the wall.\n",
+            "\n",
+            "Eight green bottles hanging on the wall,\n",
+            "Eight green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be seven green bottles hanging on the wall.\n",
+            "\n",
+            "Seven green bottles hanging on the wall,\n",
+            "Seven green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be six green bottles hanging on the wall.\n",
+            "\n",
+            "Six green bottles hanging on the wall,\n",
+            "Six green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be five green bottles hanging on the wall.\n",
+            "\n",
+            "Five green bottles hanging on the wall,\n",
+            "Five green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be four green bottles hanging on the wall.\n",
+            "\n",
+            "Four green bottles hanging on the wall,\n",
+            "Four green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be three green bottles hanging on the wall.\n",
+            "\n",
+            "Three green bottles hanging on the wall,\n",
+            "Three green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be two green bottles hanging on the wall.\n",
+            "\n",
+            "Two green bottles hanging on the wall,\n",
+            "Two green bottles hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be one green bottle hanging on the wall.\n",
+            "\n",
+            "One green bottle hanging on the wall,\n",
+            "One green bottle hanging on the wall,\n",
+            "And if one green bottle should accidentally fall,\n",
+            "There'll be no green bottles hanging on the wall.",
+        )
+    );
+}