Add secret-handshake exercise

config.json

@@ -454,6 +454,14 @@
         "prerequisites": [],
         "difficulty": 3
       },
+      {
+        "slug": "secret-handshake",
+        "name": "Secret Handshake",
+        "uuid": "b86e8223-bc7e-4df8-9fa1-2751b611c90d",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 3
+      },
       {
         "slug": "custom-set",
         "name": "Custom Set",

exercises/practice/secret-handshake/.docs/instructions.md

@@ -0,0 +1,48 @@
+# Instructions
+
+Your task is to convert a number between 1 and 31 to a sequence of actions in the secret handshake.
+
+The sequence of actions is chosen by looking at the rightmost five digits of the number once it's been converted to binary.
+Start at the right-most digit and move left.
+
+The actions for each number place are:
+
+```plaintext
+00001 = wink
+00010 = double blink
+00100 = close your eyes
+01000 = jump
+10000 = Reverse the order of the operations in the secret handshake.
+```
+
+Let's use the number `9` as an example:
+
+- 9 in binary is `1001`.
+- The digit that is farthest to the right is 1, so the first action is `wink`.
+- Going left, the next digit is 0, so there is no double-blink.
+- Going left again, the next digit is 0, so you leave your eyes open.
+- Going left again, the next digit is 1, so you jump.
+
+That was the last digit, so the final code is:
+
+```plaintext
+wink, jump
+```
+
+Given the number 26, which is `11010` in binary, we get the following actions:
+
+- double blink
+- jump
+- reverse actions
+
+The secret handshake for 26 is therefore:
+
+```plaintext
+jump, double blink
+```
+
+~~~~exercism/note
+If you aren't sure what binary is or how it works, check out [this binary tutorial][intro-to-binary].
+
+[intro-to-binary]: https://medium.com/basecs/bits-bytes-building-with-binary-13cb4289aafa
+~~~~

exercises/practice/secret-handshake/.docs/introduction.md

@@ -0,0 +1,7 @@
+# Introduction
+
+You are starting a secret coding club with some friends and friends-of-friends.
+Not everyone knows each other, so you and your friends have decided to create a secret handshake that you can use to recognize that someone is a member.
+You don't want anyone who isn't in the know to be able to crack the code.
+
+You've designed the code so that one person says a number between 1 and 31, and the other person turns it into a series of actions.

exercises/practice/secret-handshake/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "glennj"
+  ],
+  "files": {
+    "solution": [
+      "secret-handshake.wren"
+    ],
+    "test": [
+      "secret-handshake.spec.wren"
+    ],
+    "example": [
+      ".meta/proof.ci.wren"
+    ]
+  },
+  "blurb": "Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.",
+  "source": "Bert, in Mary Poppins",
+  "source_url": "https://www.imdb.com/title/tt0058331/quotes/?item=qt0437047"
+}

exercises/practice/secret-handshake/.meta/proof.ci.wren

@@ -0,0 +1,16 @@
+class SecretHandshake {
+  static commands(code) {
+    var actions = ["wink", "double blink", "close your eyes", "jump"]
+
+    var result = []
+    for (i in 0...actions.count) {
+      if (isBitSet_(code, i)) result.add(actions[i])
+    }
+
+    return isBitSet_(code, actions.count) ? reverse_(result) : result
+  }
+
+  static isBitSet_(n, i) { (n >> i) & 1 == 1 }
+
+  static reverse_(list) { list.reduce([]) {|rev, elem| [elem] + rev} }
+}

exercises/practice/secret-handshake/.meta/tests.toml

@@ -0,0 +1,43 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[b8496fbd-6778-468c-8054-648d03c4bb23]
+description = "wink for 1"
+
+[83ec6c58-81a9-4fd1-bfaf-0160514fc0e3]
+description = "double blink for 10"
+
+[0e20e466-3519-4134-8082-5639d85fef71]
+description = "close your eyes for 100"
+
+[b339ddbb-88b7-4b7d-9b19-4134030d9ac0]
+description = "jump for 1000"
+
+[40499fb4-e60c-43d7-8b98-0de3ca44e0eb]
+description = "combine two actions"
+
+[9730cdd5-ef27-494b-afd3-5c91ad6c3d9d]
+description = "reverse two actions"
+
+[0b828205-51ca-45cd-90d5-f2506013f25f]
+description = "reversing one action gives the same action"
+
+[9949e2ac-6c9c-4330-b685-2089ab28b05f]
+description = "reversing no actions still gives no actions"
+
+[23fdca98-676b-4848-970d-cfed7be39f81]
+description = "all possible actions"
+
+[ae8fe006-d910-4d6f-be00-54b7c3799e79]
+description = "reverse all possible actions"
+
+[3d36da37-b31f-4cdb-a396-d93a2ee1c4a5]
+description = "do nothing for zero"

exercises/practice/secret-handshake/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Exercism
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

exercises/practice/secret-handshake/package.wren

@@ -0,0 +1,14 @@
+import "wren-package" for WrenPackage, Dependency
+import "os" for Process
+
+class Package is WrenPackage {
+  construct new() {}
+  name { "exercism/secret-handshake" }
+  dependencies {
+    return [
+      Dependency.new("wren-testie", "0.3.0", "https://github.com/joshgoebel/wren-testie.git")
+    ]
+  }
+}
+
+Package.new().default()

exercises/practice/secret-handshake/secret-handshake.spec.wren

@@ -0,0 +1,70 @@
+import "./secret-handshake" for SecretHandshake
+import "wren-testie/testie" for Testie, Expect
+
+Testie.test("SecretHandshake") { |do, skip|
+  do.test("wink for 1") {
+    var actual = SecretHandshake.commands(1)
+    var expected = ["wink"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("double blink for 10") {
+    var actual = SecretHandshake.commands(2)
+    var expected = ["double blink"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("close your eyes for 100") {
+    var actual = SecretHandshake.commands(4)
+    var expected = ["close your eyes"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("jump for 1000") {
+    var actual = SecretHandshake.commands(8)
+    var expected = ["jump"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("combine two actions") {
+    var actual = SecretHandshake.commands(3)
+    var expected = ["wink", "double blink"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("reverse two actions") {
+    var actual = SecretHandshake.commands(19)
+    var expected = ["double blink", "wink"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("reversing one action gives the same action") {
+    var actual = SecretHandshake.commands(24)
+    var expected = ["jump"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("reversing no actions still gives no actions") {
+    var actual = SecretHandshake.commands(16)
+    var expected = []
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("all possible actions") {
+    var actual = SecretHandshake.commands(15)
+    var expected = ["wink", "double blink", "close your eyes", "jump"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("reverse all possible actions") {
+    var actual = SecretHandshake.commands(31)
+    var expected = ["jump", "close your eyes", "double blink", "wink"]
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("do nothing for zero") {
+    var actual = SecretHandshake.commands(0)
+    var expected = []
+    Expect.value(actual).toEqual(expected)
+  }
+}

exercises/practice/secret-handshake/secret-handshake.wren

@@ -0,0 +1,5 @@
+class SecretHandshake {
+  static commands(code) {
+    Fiber.abort("Remove this statement and implement this function")
+  }
+}