[gleam] complete rectangles

gleam/rectangles/.gitignore

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

gleam/rectangles/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/rectangles.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/rectangles/README.md

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+# Rectangles
+
+Welcome to Rectangles on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Count the rectangles in an ASCII diagram like the one below.
+
+```text
+   +--+
+  ++  |
++-++--+
+|  |  |
++--+--+
+```
+
+The above diagram contains these 6 rectangles:
+
+```text
+
+
++-----+
+|     |
++-----+
+```
+
+```text
+   +--+
+   |  |
+   |  |
+   |  |
+   +--+
+```
+
+```text
+   +--+
+   |  |
+   +--+
+
+
+```
+
+```text
+
+
+   +--+
+   |  |
+   +--+
+```
+
+```text
+
+
++--+
+|  |
++--+
+```
+
+```text
+
+  ++
+  ++
+
+
+```
+
+You may assume that the input is always a proper rectangle (i.e. the length of every line equals the length of the first line).
+
+## Source
+
+### Created by
+
+- @jiegillet

gleam/rectangles/gleam.toml

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+name = "rectangles"
+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"
+gleam_erlang = ">= 0.25.0 and < 1.0.0"
+
+[dev-dependencies]
+exercism_test_runner = "~> 1.4"

gleam/rectangles/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 = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+  { name = "exercism_test_runner", version = "1.8.0", 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 = "B944D89A9D049897DF28C63D595D89CB54D8C407D06EFFCE4CDA8C3EC1C9F51E" },
+  { name = "filepath", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "EFB6FF65C98B2A16378ABC3EE2B14124168C0CE5201553DE652E2644DCFDB594" },
+  { name = "gap", version = "1.1.3", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "6EF5E3B523FDFBC317E9EA28D5163EE04744A97C007106F90207569789612291" },
+  { name = "glance", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "1510D4A03C28880E62974389E5BF1A5A185036BA07392F1D769620706A9E042F" },
+  { 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 = "1.4.1", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "4CD513FC62523053E62ED7BAC2F36136EC17D6A8942728250A9A00A15E340E4B" },
+  { name = "gleam_community_colour", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "795964217EBEDB3DA656F5EB8F67D7AD22872EB95182042D3E7AFEF32D3FD2FE" },
+  { name = "gleam_erlang", version = "0.27.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "DE468F676D71B313C6C8C5334425CFCF827837333F8AB47B64D8A6D7AA40185D" },
+  { name = "gleam_json", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib", "thoas"], otp_app = "gleam_json", source = "hex", outer_checksum = "9063D14D25406326C0255BDA0021541E797D8A7A12573D849462CAFED459F6EB" },
+  { name = "gleam_otp", version = "0.12.1", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "BFACC1513410DF5A1617169A9CD7EA334973AC71D860A17574BA7B2EADD89A6F" },
+  { name = "gleam_stdlib", version = "0.40.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "86606B75A600BBD05E539EB59FABC6E307EEEA7B1E5865AFB6D980A93BCB2181" },
+  { name = "glexer", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "BD477AD657C2B637FEF75F2405FAEFFA533F277A74EF1A5E17B55B1178C228FB" },
+  { name = "simplifile", version = "1.7.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "1D5DFA3A2F9319EC85825F6ED88B8E449F381B0D55A62F5E61424E748E7DDEB0" },
+  { name = "thoas", version = "1.2.1", build_tools = ["rebar3"], requirements = [], otp_app = "thoas", source = "hex", outer_checksum = "E38697EDFFD6E91BD12CEA41B155115282630075C2A727E7A6B2947F5408B86A" },
+]
+
+[requirements]
+exercism_test_runner = { version = "~> 1.4" }
+gleam_bitwise = { version = "~> 1.2" }
+gleam_erlang = { version = ">= 0.25.0 and < 1.0.0" }
+gleam_otp = { version = "~> 0.7 or ~> 1.0" }
+gleam_stdlib = { version = "~> 0.32 or ~> 1.0" }
+simplifile = { version = "~> 1.0" }

gleam/rectangles/src/rectangles.gleam

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+import gleam/bool
+import gleam/int
+import gleam/list
+import gleam/string
+
+type Point {
+  Point(char: String, x: Int, y: Int)
+}
+
+pub fn rectangles(input: String) -> Int {
+  let points =
+    input
+    |> string.split("\n")
+    |> list.index_map(fn(line, y) {
+      line
+      |> string.to_graphemes
+      |> list.index_map(fn(char, x) { Point(char, x, y) })
+    })
+    |> list.flatten
+
+  points
+  |> list.filter(fn(p) { p.char == "+" })
+  |> list.combinations(4)
+  |> list.map(list.sort(_, fn(a, b) { int.compare(a.x, b.x) }))
+  |> list.filter(fn(vertices) {
+    let assert [tl, bl, tr, br] = vertices
+    use <- bool.guard(
+      tl.y != tr.y || tr.x != br.x || br.y != bl.y || bl.x != tl.x,
+      False,
+    )
+
+    let horizontal =
+      list.filter(points, fn(p) {
+        { p.y == tl.y || p.y == bl.y } && tl.x < p.x && p.x < tr.x
+      })
+    let vertical =
+      list.filter(points, fn(p) {
+        { p.x == tl.x || p.x == tr.x } && tl.y < p.y && p.y < bl.y
+      })
+
+    list.all(horizontal, fn(p) { p.char == "-" || p.char == "+" })
+    && list.all(vertical, fn(p) { p.char == "|" || p.char == "+" })
+  })
+  |> list.length
+}

gleam/rectangles/test/rectangles_test.gleam

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+import exercism/should
+import exercism/test_runner
+import rectangles
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn no_rows_test() {
+  rectangles.rectangles("")
+  |> should.equal(0)
+}
+
+pub fn no_columns_test() {
+  rectangles.rectangles(
+    "
+     
+    ",
+  )
+  |> should.equal(0)
+}
+
+pub fn no_rectangles_test() {
+  rectangles.rectangles(" ")
+  |> should.equal(0)
+}
+
+pub fn one_rectangle_test() {
+  rectangles.rectangles(
+    "
+    +-+
+    | |
+    +-+
+    ",
+  )
+  |> should.equal(1)
+}
+
+pub fn two_rectangles_without_shared_parts_test() {
+  rectangles.rectangles(
+    "
+      +-+
+      | |
+    +-+-+
+    | |  
+    +-+  
+    ",
+  )
+  |> should.equal(2)
+}
+
+pub fn five_rectangles_with_shared_parts_test() {
+  rectangles.rectangles(
+    "
+      +-+
+      | |
+    +-+-+
+    | | |
+    +-+-+
+    ",
+  )
+  |> should.equal(5)
+}
+
+pub fn rectangle_of_height_1_is_counted_test() {
+  rectangles.rectangles(
+    "
+    +--+
+    +--+
+    ",
+  )
+  |> should.equal(1)
+}
+
+pub fn rectangle_of_width_1_is_counted_test() {
+  rectangles.rectangles(
+    "
+    ++
+    ||
+    ++
+    ",
+  )
+  |> should.equal(1)
+}
+
+pub fn one_by_one_square_is_counted_test() {
+  rectangles.rectangles(
+    "
+    ++
+    ++
+    ",
+  )
+  |> should.equal(1)
+}
+
+pub fn only_complete_rectangles_are_counted_test() {
+  rectangles.rectangles(
+    "
+      +-+
+        |
+    +-+-+
+    | | -
+    +-+-+
+    ",
+  )
+  |> should.equal(1)
+}
+
+pub fn rectangles_can_be_of_different_sizes_test() {
+  rectangles.rectangles(
+    "
+      +------+----+
+      |      |    |
+      +---+--+    |
+      |   |       |
+      +---+-------+
+    ",
+  )
+  |> should.equal(3)
+}
+
+pub fn corner_is_required_for_a_rectangle_to_be_complete_test() {
+  rectangles.rectangles(
+    "
+      +------+----+
+      |      |    |
+      +------+    |
+      |   |       |
+      +---+-------+
+    ",
+  )
+  |> should.equal(2)
+}
+
+pub fn large_input_with_many_rectangles_test() {
+  rectangles.rectangles(
+    "
+      +---+--+----+
+      |   +--+----+
+      +---+--+    |
+      |   +--+----+
+      +---+--+--+-+
+      +---+--+--+-+
+      +------+  | |
+                +-+
+    ",
+  )
+  |> should.equal(60)
+}
+
+pub fn rectangles_must_have_four_sides_test() {
+  rectangles.rectangles(
+    "
+      +-+ +-+
+      | | | |
+      +-+-+-+
+        | |  
+      +-+-+-+
+      | | | |
+      +-+ +-+
+    ",
+  )
+  |> should.equal(5)
+}