chore: offload user input to InputManager

src/shell/wush/Environment.ts

@@ -0,0 +1,40 @@
+/**
+ * Wush environment manager
+ * Manages environment variables, aliases etc.
+ */
+export class Environment {
+    private variables: Record<string, string> = {}
+    private aliases: Record<string, string> = {}
+
+    SetVariable(name: string, value: string | null): void {
+        if (value === null) {
+            // remove the variable if value is null
+            delete this.variables[name]
+        } else this.variables[name] = value
+    }
+
+    GetVariable(name: string): string | null {
+        return this.variables[name] ?? null
+    }
+
+    SetAlias(name: string, value: string | null): void {
+        if (value === null) {
+            // remove the alias if value is null
+            delete this.aliases[name]
+        } else this.aliases[name] = value
+    }
+
+    GetAlias(name: string): string | null {
+        return this.aliases[name] ?? null
+    }
+
+    GetAliasesByValue(value: string): string[] | null {
+        const keys: string[] = []
+
+        for (const key in this.aliases)
+            if (this.aliases[key] === value)
+                keys.push(key)
+
+        return keys.length === 0 ? null : keys
+    }
+}