Add __bool__ method call to branch conditions

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/compile/compiler.rs

@@ -108,6 +108,9 @@ impl Compiler {
 
                     let mut cond_thunk = self.emit_expr(&cond_block.inner().cond);
                     cond_thunk.push_front(Inst::Comment("elseif compare ".to_string()));
+                    cond_thunk.push_back(Inst::Dupe);
+                    cond_thunk.push_back(Inst::GetAttr(self.intern_attr(BOOL_METHOD)));
+                    cond_thunk.push_back(Inst::Call(1));
                     cond_thunk.push_back(Inst::Compare);
                     // jump forward by the length of the body
                     cond_thunk.push_back(Inst::JumpRelative(
@@ -129,6 +132,9 @@ impl Compiler {
 
                 let mut cond_thunk = self.emit_expr(&if_true.inner().cond);
                 cond_thunk.push_front(Inst::Comment("if compare".to_string()));
+                cond_thunk.push_back(Inst::Dupe);
+                cond_thunk.push_back(Inst::GetAttr(self.intern_attr(BOOL_METHOD)));
+                cond_thunk.push_back(Inst::Call(1));
                 cond_thunk.push_back(Inst::Compare);
                 cond_thunk.push_back(Inst::JumpRelative(
                     // + 1 because otherwise we won't end up on the next instruction

src/obj/mod.rs

@@ -2,13 +2,14 @@ pub mod boolean;
 pub mod builtin_fun;
 pub mod builtins;
 pub mod int;
+pub mod names;
 pub mod none;
 pub mod str;
 pub mod user_fun;
 
 pub mod prelude {
     // Module types
-    pub use super::{boolean::*, builtin_fun::*, int::*, none::*, str::*, user_fun::*};
+    pub use super::{boolean::*, builtin_fun::*, int::*, names::*, none::*, str::*, user_fun::*};
     // Local types
     pub use super::{Attrs, AttrsPtr, Obj, ObjPtr};
     // Macros

src/obj/names.rs

@@ -0,0 +1,13 @@
+/*
+use crate::obj::prelude::*;
+use std::sync::LazyLock;
+
+macro_rules! name {
+    ($name:expr) => {
+        LazyLock::new(|| ObjPtr::new(Str::new($name)))
+    };
+}
+*/
+
+pub const BOOL_METHOD: &str = "__bool__";
+//pub static BOOL_METHOD_NAME: LazyLock<ObjPtr> = name!(BOOL_METHOD);