Launcher: first refactoring pass

Modules/Launcher/Plugins/CalculatorPlugin.qml

@@ -0,0 +1,105 @@
+import QtQuick
+import qs.Services
+import "../../../Helpers/AdvancedMath.js" as AdvancedMath
+
+QtObject {
+  property var launcher: null
+  property string name: "Calculator"
+
+  function handleCommand(query) {
+    // Handle >calc command or direct math expressions after >
+    return query.startsWith(">calc") || (query.startsWith(">") && query.length > 1 && isMathExpression(
+                                           query.substring(1)))
+  }
+
+  function commands() {
+    return [{
+              "name": ">calc",
+              "description": "Calculator - evaluate mathematical expressions",
+              "icon": "accessories-calculator",
+              "onActivate": function () {
+                launcher.setSearchText(">calc ")
+              }
+            }]
+  }
+
+  function getResults(query) {
+    let expression = ""
+
+    if (query.startsWith(">calc")) {
+      expression = query.substring(5).trim()
+    } else if (query.startsWith(">")) {
+      expression = query.substring(1).trim()
+    } else {
+      return []
+    }
+
+    if (!expression) {
+      return [{
+                "name": "Calculator",
+                "description": "Enter a mathematical expression",
+                "icon": "accessories-calculator",
+                "onActivate": function () {}
+              }]
+    }
+
+    try {
+      let result = AdvancedMath.evaluate(expression.trim())
+
+      return [{
+                "name": AdvancedMath.formatResult(result),
+                "description": `${expression} = ${result}`,
+                "icon": "accessories-calculator",
+                "onActivate": function () {
+                  // Copy result to clipboard if service available
+                  // if (typeof ClipboardService !== 'undefined') {
+                  //   ClipboardService.copy(result.toString())
+                  // }
+                  launcher.close()
+                }
+              }]
+    } catch (error) {
+      return [{
+                "name": "Error",
+                "description": error.message || "Invalid expression",
+                "icon": "dialog-error",
+                "onActivate": function () {}
+              }]
+    }
+  }
+
+  function evaluateExpression(expr) {
+    // Sanitize input - only allow safe characters
+    const sanitized = expr.replace(/[^0-9\+\-\*\/\(\)\.\s\%]/g, '')
+    if (sanitized !== expr) {
+      throw new Error("Invalid characters in expression")
+    }
+
+    // Don't allow empty expressions
+    if (!sanitized.trim()) {
+      throw new Error("Empty expression")
+    }
+
+    try {
+      // Use Function constructor for safe evaluation
+      // This is safer than eval() but still evaluate math
+      const result = Function('"use strict"; return (' + sanitized + ')')()
+
+      // Check for valid result
+      if (!isFinite(result)) {
+        throw new Error("Result is not a finite number")
+      }
+
+      // Round to reasonable precision to avoid floating point issues
+      return Math.round(result * 1000000000) / 1000000000
+    } catch (e) {
+      throw new Error("Invalid mathematical expression")
+    }
+  }
+
+  function isMathExpression(expr) {
+    // Check if string looks like a math expression
+    // Allow digits, operators, parentheses, decimal points, and whitespace
+    return /^[\d\s\+\-\*\/\(\)\.\%]+$/.test(expr)
+  }
+  }