Various changes

src/cogs/macros.py

@@ -449,6 +449,11 @@ async def hash_(vars: VariableRegistry, seed: Any):
 
         # Strings
 
+        @builtin("join")
+        async def join_(vars: VariableRegistry, delimiter: str, l: Any):
+            """Joins its input by a given delimiter."""
+            return str(delimiter).join(l)
+
         @builtin("slice")
         async def slice_(vars: VariableRegistry, slicable: Any, start: int, end: int, step: int):
             """Slices a list or string given a start, end, and step."""

src/types.py

@@ -341,18 +341,35 @@ def __init__(self, name, description, source, inputs, variable_args, author, for
         self.author = author
         self.forest = forest
 
+    async def simplify_value(self, ctx: MacroCog, vars: VariableRegistry, val: Any, l: list):
+        if isinstance(val, MacroTree):
+            val = await ctx.evaluate_tree(val, vars)
+        if isinstance(val, list):
+            new_val = []
+            for v in val:
+                await self.simplify_value(ctx, vars, v, new_val)
+            l.append(new_val)
+        elif isinstance(val, Unpack):
+            args = []
+            await self.simplify_value(ctx, vars, val.inner, args)
+            l.extend(args[0])
+        else:
+            l.append(val)
+
     async def eval(self, ctx: MacroCog, vars: VariableRegistry, args: list[Any]):
         if self.variable_args:
             if len(args) >= len(self.inputs):
                 variable = args[len(self.inputs) - 1:]
+
                 args[len(self.inputs) - 1] = variable
         if self.captured_scope is not None:
             self.captured_scope.parent = vars
             vars = self.captured_scope
+        unpacked_args = []
+        for arg in args:
+            await self.simplify_value(ctx, vars, arg, unpacked_args)
         scope = vars.branch()
-        for name, val in zip(self.inputs, args):
-            if isinstance(val, MacroTree):
-                val = await ctx.evaluate_tree(val, vars)
+        for name, val in zip(self.inputs, unpacked_args):
             scope.variables[name] = val
         return await ctx.evaluate_forest(self.forest, vars = scope)