[gleam] complete roman-numerals

gleam/roman-numerals/.gitignore

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+*.beam
+*.ez
+build
+erl_crash.dump

gleam/roman-numerals/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests, run the command `gleam test` from within the exercise directory.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/roman_numerals.gleam` 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 [Gleam track's documentation](https://exercism.org/docs/tracks/gleam)
+- The [Gleam track's programming category on the forum](https://forum.exercism.org/c/programming/gleam)
+- [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.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [gleam.run](https://gleam.run/documentation/) is the gleam official documentation.
+- [Discord](https://discord.gg/Fm8Pwmy) is the discord channel.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/gleam) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

gleam/roman-numerals/README.md

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+# Roman Numerals
+
+Welcome to Roman Numerals on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+Today, most people in the world use Arabic numerals (0–9).
+But if you travelled back two thousand years, you'd find that most Europeans were using Roman numerals instead.
+
+To write a Roman numeral we use the following Latin letters, each of which has a value:
+
+| M    | D   | C   | L   | X   | V   | I   |
+| ---- | --- | --- | --- | --- | --- | --- |
+| 1000 | 500 | 100 | 50  | 10  | 5   | 1   |
+
+A Roman numeral is a sequence of these letters, and its value is the sum of the letters' values.
+For example, `XVIII` has the value 18 (`10 + 5 + 1 + 1 + 1 = 18`).
+
+There's one rule that makes things trickier though, and that's that **the same letter cannot be used more than three times in succession**.
+That means that we can't express numbers such as 4 with the seemingly natural `IIII`.
+Instead, for those numbers, we use a subtraction method between two letters.
+So we think of `4` not as `1 + 1 + 1 + 1` but instead as `5 - 1`.
+And slightly confusingly to our modern thinking, we write the smaller number first.
+This applies only in the following cases: 4 (`IV`), 9 (`IX`), 40 (`XL`), 90 (`XC`), 400 (`CD`) and 900 (`CM`).
+
+Order matters in Roman numerals!
+Letters (and the special compounds above) must be ordered by decreasing value from left to right.
+
+Here are some examples:
+
+```text
+ 105 => CV
+---- => --
+ 100 => C
++  5 =>  V
+```
+
+```text
+ 106 => CVI
+---- => --
+ 100 => C
++  5 =>  V
++  1 =>   I
+```
+
+```text
+ 104 => CIV
+---- => ---
+ 100 => C
++  4 =>  IV
+```
+
+And a final more complex example:
+
+```text
+ 1996 => MCMXCVI
+----- => -------
+ 1000 => M
++ 900 =>  CM
++  90 =>    XC
++   5 =>      V
++   1 =>       I
+```
+
+## Instructions
+
+Your task is to convert a number from Arabic numerals to Roman numerals.
+
+For this exercise, we are only concerned about traditional Roman numerals, in which the largest number is MMMCMXCIX (or 3,999).
+
+~~~~exercism/note
+There are lots of different ways to convert between Arabic and Roman numerals.
+We recommend taking a naive approach first to familiarise yourself with the concept of Roman numerals and then search for more efficient methods.
+
+Make sure to check out our Deep Dive video at the end to explore the different approaches you can take!
+~~~~
+
+## Source
+
+### Created by
+
+- @massivefermion
+
+### Contributed to by
+
+- @lpil
+- @kytrinyx
+
+### Based on
+
+The Roman Numeral Kata - https://codingdojo.org/kata/RomanNumerals/

gleam/roman-numerals/gleam.toml

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+name = "roman_numerals"
+version = "0.1.0"
+
+[dependencies]
+gleam_bitwise = "~> 1.2"
+gleam_otp = "~> 0.7 or ~> 1.0"
+gleam_stdlib = "~> 0.32 or ~> 1.0"
+simplifile = "~> 1.0"
+
+[dev-dependencies]
+exercism_test_runner = "~> 1.4"

gleam/roman-numerals/manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "argv", version = "1.0.1", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "A6E9009E50BBE863EB37D963E4315398D41A3D87D0075480FC244125808F964A" },
+  { name = "exercism_test_runner", version = "1.7.0", build_tools = ["gleam"], requirements = ["argv", "gap", "glance", "gleam_community_ansi", "gleam_erlang", "gleam_json", "gleam_stdlib", "simplifile"], otp_app = "exercism_test_runner", source = "hex", outer_checksum = "2FC1BADB19BEC2AE77BFD2D3A606A014C85412A7B874CAFC4BA8CF04B0B257CD" },
+  { name = "gap", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "2EE1B0A17E85CF73A0C1D29DA315A2699117A8F549C8E8D89FA8261BE41EDEB1" },
+  { name = "glance", version = "0.8.2", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "ACF09457E8B564AD7A0D823DAFDD326F58263C01ACB0D432A9BEFDEDD1DA8E73" },
+  { name = "gleam_bitwise", version = "1.3.1", build_tools = ["gleam"], requirements = [], otp_app = "gleam_bitwise", source = "hex", outer_checksum = "B36E1D3188D7F594C7FD4F43D0D2CE17561DE896202017548578B16FE1FE9EFC" },
+  { name = "gleam_community_ansi", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "FE79E08BF97009729259B6357EC058315B6FBB916FAD1C2FF9355115FEB0D3A4" },
+  { name = "gleam_community_colour", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "A49A5E3AE8B637A5ACBA80ECB9B1AFE89FD3D5351FF6410A42B84F666D40D7D5" },
+  { name = "gleam_erlang", version = "0.24.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "26BDB52E61889F56A291CB34167315780EE4AA20961917314446542C90D1C1A0" },
+  { name = "gleam_json", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "thoas"], otp_app = "gleam_json", source = "hex", outer_checksum = "8B197DD5D578EA6AC2C0D4BDC634C71A5BCA8E7DB5F47091C263ECB411A60DF3" },
+  { name = "gleam_otp", version = "0.10.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "0B04FE915ACECE539B317F9652CAADBBC0F000184D586AAAF2D94C100945D72B" },
+  { name = "gleam_stdlib", version = "0.36.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "C0D14D807FEC6F8A08A7C9EF8DFDE6AE5C10E40E21325B2B29365965D82EB3D4" },
+  { name = "glexer", version = "0.7.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "4484942A465482A0A100936E1E5F12314DB4B5AC0D87575A7B9E9062090B96BE" },
+  { name = "simplifile", version = "1.5.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "EB9AA8E65E5C1E3E0FDCFC81BC363FD433CB122D7D062750FFDF24DE4AC40116" },
+  { name = "thoas", version = "0.4.1", build_tools = ["rebar3"], requirements = [], otp_app = "thoas", source = "hex", outer_checksum = "4918D50026C073C4AB1388437132C77A6F6F7C8AC43C60C13758CC0ADCE2134E" },
+]
+
+[requirements]
+exercism_test_runner = { version = "~> 1.4" }
+gleam_bitwise = { version = "~> 1.2" }
+gleam_otp = { version = "~> 0.7 or ~> 1.0" }
+gleam_stdlib = { version = "~> 0.32 or ~> 1.0" }
+simplifile = { version = "~> 1.0" }

gleam/roman-numerals/src/roman_numerals.gleam

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+import gleam/list
+
+const value_to_roman = [
+  #(1000, "M"),
+  #(900, "CM"),
+  #(500, "D"),
+  #(400, "CD"),
+  #(100, "C"),
+  #(90, "XC"),
+  #(50, "L"),
+  #(40, "XL"),
+  #(10, "X"),
+  #(9, "IX"),
+  #(5, "V"),
+  #(4, "IV"),
+  #(1, "I"),
+]
+
+pub fn convert(number: Int) -> String {
+  convert_iter(number, "")
+}
+
+fn convert_iter(remainder: Int, result: String) -> String {
+  case list.find(value_to_roman, fn(pair) { remainder >= pair.0 }) {
+    Ok(#(value, roman)) -> convert_iter(remainder - value, result <> roman)
+    _ -> result
+  }
+}

gleam/roman-numerals/test/roman_numerals_test.gleam

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+import exercism/should
+import exercism/test_runner
+import roman_numerals.{convert}
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn number_1_is_i_test() {
+  convert(1)
+  |> should.equal("I")
+}
+
+pub fn number_2_is_ii_test() {
+  convert(2)
+  |> should.equal("II")
+}
+
+pub fn number_3_is_iii_test() {
+  convert(3)
+  |> should.equal("III")
+}
+
+pub fn number_4_is_iv_test() {
+  convert(4)
+  |> should.equal("IV")
+}
+
+pub fn number_5_is_v_test() {
+  convert(5)
+  |> should.equal("V")
+}
+
+pub fn number_6_is_vi_test() {
+  convert(6)
+  |> should.equal("VI")
+}
+
+pub fn number_9_is_ix_test() {
+  convert(9)
+  |> should.equal("IX")
+}
+
+pub fn number_16_is_xvi_test() {
+  convert(16)
+  |> should.equal("XVI")
+}
+
+pub fn number_27_is_xxvii_test() {
+  convert(27)
+  |> should.equal("XXVII")
+}
+
+pub fn number_48_is_xlviii_test() {
+  convert(48)
+  |> should.equal("XLVIII")
+}
+
+pub fn number_49_is_xlix_test() {
+  convert(49)
+  |> should.equal("XLIX")
+}
+
+pub fn number_59_is_lix_test() {
+  convert(59)
+  |> should.equal("LIX")
+}
+
+pub fn number_66_is_lxvi_test() {
+  convert(66)
+  |> should.equal("LXVI")
+}
+
+pub fn number_93_is_xciii_test() {
+  convert(93)
+  |> should.equal("XCIII")
+}
+
+pub fn number_141_is_cxli_test() {
+  convert(141)
+  |> should.equal("CXLI")
+}
+
+pub fn number_163_is_clxiii_test() {
+  convert(163)
+  |> should.equal("CLXIII")
+}
+
+pub fn number_166_is_clxvi_test() {
+  convert(166)
+  |> should.equal("CLXVI")
+}
+
+pub fn number_402_is_cdii_test() {
+  convert(402)
+  |> should.equal("CDII")
+}
+
+pub fn number_575_is_dlxxv_test() {
+  convert(575)
+  |> should.equal("DLXXV")
+}
+
+pub fn number_666_is_dclxvi_test() {
+  convert(666)
+  |> should.equal("DCLXVI")
+}
+
+pub fn number_911_is_cmxi_test() {
+  convert(911)
+  |> should.equal("CMXI")
+}
+
+pub fn number_1024_is_mxxiv_test() {
+  convert(1024)
+  |> should.equal("MXXIV")
+}
+
+pub fn number_1666_is_mdclxvi_test() {
+  convert(1666)
+  |> should.equal("MDCLXVI")
+}
+
+pub fn number_3000_is_mmm_test() {
+  convert(3000)
+  |> should.equal("MMM")
+}
+
+pub fn number_3001_is_mmmi_test() {
+  convert(3001)
+  |> should.equal("MMMI")
+}
+
+pub fn number_3999_is_mmmcmxcix_test() {
+  convert(3999)
+  |> should.equal("MMMCMXCIX")
+}