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rust/bottle-song/.exercism/config.json Normal file
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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"
}

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rust/bottle-song/.gitignore vendored Normal file
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/target
Cargo.lock

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rust/bottle-song/Cargo.toml Normal file
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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]

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rust/bottle-song/HELP.md Normal file
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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

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rust/bottle-song/README.md Normal file
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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

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rust/bottle-song/src/lib.rs Normal file
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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}")
}

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rust/bottle-song/tests/bottle_song.rs Normal file
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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.",
)
);
}