Fix compiler error when using a macro with format! inside it.

Author: GrayJack

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to the library should be put here
 
 ## Unreleased
 
+## 0.3.1
+
+### Fixes
+
+-   Fix compiler complaining about alloc crate when `std` feature is active while using a macro
+
 ## 0.3.0
 
 ### Changes

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "janetrs"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Eric Shimizu Karbstein <gr41.j4ck@gmail.com>"]
 description = "High level binding for Janet programming language"
 repository = "https://github.com/GrayJack/janetrs"

src/macros.rs

@@ -265,6 +265,7 @@ macro_rules! janet_mod {
 /// jpanic!(4); // In simple cases you can use any type that Janet implements From trait
 /// jpanic!("this is a {} {message}", "fancy", message = "message");
 /// ```
+#[cfg(not(feature = "std"))]
 #[macro_export]
 macro_rules! jpanic {
     () => {
@@ -274,7 +275,34 @@ macro_rules! jpanic {
         $crate::util::_panic($crate::Janet::from($msg));
     };
     ($msg:expr, $($arg:tt)+) => {
-        $crate::util::_panic($crate::Janet::from(alloc::format!($msg, $($arg)+).as_str()));
+        $crate::util::_panic($crate::Janet::from(::alloc::format!($msg, $($arg)+).as_str()));
+    };
+}
+
+/// Causes a panic in the Janet side. Diferently of the Rust `panic!` macro, this macro
+/// does **not** terminate the current thread. Instead, it sends a error signal with the
+/// passed message where the Janet runtime takes care to properly exit.
+///
+/// # Examples
+/// ```ignore
+/// use janetrs::jpanic;
+/// # let _client = janetrs::client::JanetClient::init().unwrap();
+/// jpanic!();
+/// jpanic!("this is a terrible mistake!");
+/// jpanic!(4); // In simple cases you can use any type that Janet implements From trait
+/// jpanic!("this is a {} {message}", "fancy", message = "message");
+/// ```
+#[cfg(feature = "std")]
+#[macro_export]
+macro_rules! jpanic {
+    () => {
+        $crate::util::_panic($crate::Janet::from("explicity panic"));
+    };
+    ($msg:expr $(,)?) => {
+        $crate::util::_panic($crate::Janet::from($msg));
+    };
+    ($msg:expr, $($arg:tt)+) => {
+        $crate::util::_panic($crate::Janet::from(::std::format!($msg, $($arg)+).as_str()));
     };
 }
 

src/util.rs

@@ -66,7 +66,10 @@ pub fn c_func(
     doc: Option<&str>,
 ) {
     if let Some(prefix) = namespace {
-        let full_name = alloc::format!("{}/{}", prefix.trim(), fn_name.trim());
+        #[cfg(feature = "std")]
+        let full_name = ::std::format!("{}/{}", prefix.trim(), fn_name.trim());
+        #[cfg(not(feature = "std"))]
+        let full_name = ::alloc::format!("{}/{}", prefix.trim(), fn_name.trim());
         let mut cfun = JanetTable::with_capacity(2);
 
         cfun.insert(JanetKeyword::new("value"), f);