From a1ad9b4f55e6db63351d5e172063429a7c4b3c66 Mon Sep 17 00:00:00 2001
From: Marc Lipovsky <marclipovsky@gmail.com>
Date: Mon, 7 Oct 2024 19:30:38 -0400
Subject: [PATCH] Add random case command fixes #54

---
 package.json               | 12 ++++++++-
 src/extension.ts           | 13 +++++++++
 src/test/extension.test.ts | 54 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 3324c68..41fd419 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,8 @@
     "onCommand:string-manipulation.decrement",
     "onCommand:string-manipulation.duplicateAndIncrement",
     "onCommand:string-manipulation.duplicateAndDecrement",
-    "onCommand:string-manipulation.sequence"
+    "onCommand:string-manipulation.sequence",
+    "onCommand:string-manipulation.randomCase"
   ],
   "contributes": {
     "commands": [
@@ -193,6 +194,11 @@
         "title": "Convert UTF8 to char",
         "category": "String Manipulation",
         "command": "string-manipulation.utf8ToChar"
+      },
+      {
+        "title": "Random Case",
+        "category": "String Manipulation",
+        "command": "string-manipulation.randomCase"
       }
     ],
     "submenus": [
@@ -324,6 +330,10 @@
         {
           "command": "string-manipulation.charToUtf8",
           "group": "7_modification"
+        },
+        {
+          "command": "string-manipulation.randomCase",
+          "group": "7_modification"
         }
       ]
     }
diff --git a/src/extension.ts b/src/extension.ts
index 7946d5a..8c24b60 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -27,6 +27,18 @@ const increment = (str: string) =>
 const decrement = (str: string) =>
   str.replace(/-?\d+/g, (n) => String(Number(n) - 1));
 
+const randomCase = (input: string): string => {
+  let result = "";
+  for (const char of input) {
+    if (Math.random() < 0.5) {
+      result += char.toLowerCase();
+    } else {
+      result += char.toUpperCase();
+    }
+  }
+  return result;
+};
+
 export type StringFunction = (
   str: string,
   multiselectData?: MultiSelectData
@@ -88,6 +100,7 @@ const commandNameFunctionMap: { [key: string]: CommandFunction } = {
       .split("")
       .map((x) => `\\u${x.charCodeAt(0).toString(16).padStart(4, "0")}`)
       .join(""),
+  randomCase,
 };
 
 const numberFunctionNames = [
diff --git a/src/test/extension.test.ts b/src/test/extension.test.ts
index a601d4c..d00fabc 100644
--- a/src/test/extension.test.ts
+++ b/src/test/extension.test.ts
@@ -146,5 +146,59 @@ suite("Extension Test Suite", () => {
         assert.equal(func(originalString, multiselectData), expectedString);
       });
     });
+
+    suite("randomCase", () => {
+    const input = "Hello, World!";
+
+    test("returns a string of the same length", () => {
+      const output = myExtension.commandNameFunctionMap["randomCase"](
+        input
+      ) as string;
+      assert.equal(output.length, input.length);
+    });
+
+    test("contains the same characters ignoring case", () => {
+      const output = myExtension.commandNameFunctionMap["randomCase"](
+        input
+      ) as string;
+      assert.equal(output.toLowerCase(), input.toLowerCase());
+    });
+
+    test("changes the case of at least one character (statistically)", () => {
+      let changed = false;
+      for (let i = 0; i < 10; i++) {
+        const output = myExtension.commandNameFunctionMap["randomCase"](
+          input
+        ) as string;
+        if (output !== input && output.toLowerCase() === input.toLowerCase()) {
+          changed = true;
+          break;
+        }
+      }
+      assert.equal(changed, true);
+    });
+
+    test("handles empty strings", () => {
+      const output = myExtension.commandNameFunctionMap.randomCase("");
+      assert.equal(output, "");
+    });
+
+    test("preserves non-alphabetic characters", () => {
+      const specialChars = "12345!@#$%";
+      const output =
+        myExtension.commandNameFunctionMap.randomCase(specialChars);
+      assert.equal(output, specialChars);
+    });
+
+    test("handles strings with mixed content", () => {
+      const mixedInput = "Test123!";
+      const output = myExtension.commandNameFunctionMap.randomCase(
+        mixedInput
+      ) as string;
+      assert.equal(output.length, mixedInput.length);
+      assert.notEqual(output.replace(/[^a-zA-Z]/g, ""), "");
+    });
+
+      });
   });
 });