feat: add CHANGELOG and simplify tmpl! macro syntax

Introduce a CHANGELOG.md file and update the `tmpl!` macro to use a
cleaner syntax with comma-separated key-value pairs instead of the `+=`
operator and parentheses-wrapped parameters

2 files changed, 24 insertions, 8 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 704b310..cf9d66e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -33,12 +33,12 @@
 //!     <<<crate_name>>> => Some(<<<crate_name>>>::exec(data, params).await),
 //! @@@ <<<
 //! ".trim().to_string());
-//! tmpl!(tmpl += {
+//! tmpl!(tmpl,
 //!     arms {
-//!         (crate_name = "my"),
-//!         (crate_name = "you")
+//!         crate_name = "my",
+//!         crate_name = "you",
 //!     }
-//! });
+//! );
 //! // Output the expanded template
 //! let expanded = tmpl.to_string();
 //! assert_eq!(expanded, "
@@ -63,6 +63,22 @@ macro_rules! tmpl_param {
 
 #[macro_export]
 macro_rules! tmpl {
+    ($template:ident, $($name:ident {
+        $($key:ident = $value:expr),* $(,)?
+    }),* $(,)?) => {{
+        $(
+            let $name = $template.add_impl(stringify!($name).to_string());
+            $(
+                $name.push({
+                    let mut params = std::collections::HashMap::new();
+                    params.insert(stringify!($key).to_string(), $value.to_string());
+                    params
+                });
+            )*
+        )*
+    }};
+
+    // Old syntax
     ($template:ident += {
         $($name:ident {
             $(($($key:ident = $value:expr),* $(,)?)),*
diff --git a/src/test.rs b/src/test.rs
index a5ef801..91407fc 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -15,12 +15,12 @@ mod tests {
 
         let mut tmpl = Template::from(input);
         tmpl_param!(tmpl, func_name = "my_func");
-        tmpl!(tmpl += {
+        tmpl!(tmpl,
             arms {
-                (crate_name = "my"),
-                (crate_name = "you")
+                crate_name = "my",
+                crate_name = "you",
             }
-        });
+        );
 
         let expanded = tmpl.expand().unwrap();
         assert_eq!(expanded, expect);