feat(just_template): add proc-macro `tmpl!` and restructure crate

Move the old `tmpl!` and `tmpl_param!` macros into a dedicated
`just_template_macros` proc-macro crate. The new `tmpl!` macro supports
both simple parameter assignment and multi-arm implementation blocks
with per-arm overrides. Remove the deprecated `deprecated` module and
update tests accordingly.

1 files changed, 186 insertions, 0 deletions

diff --git a/just_template/src/test_macros.rs b/just_template/src/test_macros.rs
new file mode 100644
index 0000000..5be58f5
--- /dev/null
+++ b/just_template/src/test_macros.rs
@@ -0,0 +1,186 @@
+use crate::Template;
+use crate::tmpl;
+
+#[test]
+fn basic_param() {
+    let mut tmpl = Template::from("Hello, <<<name>>>!".to_string());
+
+    tmpl!(tmpl, name = "World");
+    // tmpl.insert_param("name".to_string(), "World".to_string());
+
+    assert_eq!(tmpl.expand().unwrap(), "Hello, World!");
+}
+
+#[test]
+fn multi_param() {
+    let mut tmpl = Template::from("<<<a>>> + <<<b>>> = <<<c>>>".to_string());
+
+    tmpl! {
+        // tmpl, // Template named tmpl can be omitted
+        a = "1",
+        b = "2",
+        c = "3",
+    };
+
+    assert_eq!(tmpl.expand().unwrap(), "1 + 2 = 3");
+}
+
+#[test]
+fn impl_blocks() {
+    let mut tmpl = Template::from(
+        r#"
+>>>>>>>>>> arms
+@@@ >>> arms
+    "<<<crate_name>>>" => Some(<<<crate_name>>>::exec(data, params).await),
+@@@ <<<
+"#
+        .trim()
+        .to_string(),
+    );
+
+    tmpl! {
+        arms {
+            crate_name = "my",
+            crate_name = "you",
+        }
+    }
+
+    let expanded = tmpl.expand().unwrap();
+    assert!(expanded.contains(r#""my" => Some(my::exec(data, params).await)"#));
+    assert!(expanded.contains(r#""you" => Some(you::exec(data, params).await)"#));
+}
+
+#[test]
+fn display_block_global_hidden_by_default() {
+    let tmpl = Template::from(
+        r#"
+visible line
+??? >>> debug
+    hidden line
+??? <<<
+visible end
+"#
+        .trim()
+        .to_string(),
+    );
+
+    let expanded = tmpl.expand().unwrap();
+    assert!(expanded.contains("visible line"));
+    assert!(expanded.contains("visible end"));
+    assert!(!expanded.contains("hidden line"));
+}
+
+#[test]
+fn display_block_global_shown_via_param() {
+    let mut tmpl = Template::from(
+        r#"
+visible line
+??? >>> debug
+    shown line
+??? <<<
+visible end
+"#
+        .trim()
+        .to_string(),
+    );
+
+    tmpl! {
+        debug = true,
+    }
+
+    let expanded = tmpl.expand().unwrap();
+    assert!(expanded.contains("visible line"));
+    assert!(expanded.contains("visible end"));
+    assert!(expanded.contains("shown line"));
+}
+
+#[test]
+fn display_block_inside_impl_area_hidden_by_default() {
+    let mut tmpl = Template::from(
+        r#"
+>>>>>>>>>> arms
+@@@ >>> arms
+    <<<crate_name>>> => exec,
+??? >>> extra
+    <<<crate_name>>> => metrics,
+??? <<<
+@@@ <<<
+"#
+        .trim()
+        .to_string(),
+    );
+
+    tmpl! {
+        arms {
+            crate_name = "my"
+        }
+    }
+
+    let expanded = tmpl.expand().unwrap();
+    assert!(expanded.contains(r#"my => exec"#));
+    assert!(!expanded.contains(r#"my => metrics"#));
+}
+
+#[test]
+fn display_block_inside_impl_area_shown_by_global_param() {
+    let mut tmpl = Template::from(
+        r#"
+>>>>>>>>>> arms
+@@@ >>> arms
+    <<<crate_name>>> => exec,
+??? >>> extra
+    <<<crate_name>>> => metrics,
+??? <<<
+@@@ <<<
+"#
+        .trim()
+        .to_string(),
+    );
+
+    tmpl! {
+        extra = true,
+        arms {
+            crate_name = "my",
+            crate_name = "you"
+        }
+    }
+
+    let expanded = tmpl.expand().unwrap();
+    assert!(expanded.contains(r#"my => exec"#));
+    assert!(expanded.contains(r#"my => metrics"#));
+    assert!(expanded.contains(r#"you => exec"#));
+    assert!(expanded.contains(r#"you => metrics"#));
+}
+
+#[test]
+fn display_block_inside_impl_area_shown_by_arm_param() {
+    let mut tmpl = Template::from(
+        r#"
+>>>>>>>>>> arms
+@@@ >>> arms
+    <<<crate_name>>> => exec,
+??? >>> extra
+    <<<crate_name>>> => metrics,
+??? <<<
+@@@ <<<
+"#
+        .trim()
+        .to_string(),
+    );
+
+    tmpl! {
+        arms {
+            crate_name = "my",
+            {
+                crate_name = "you",
+                extra = true
+            }
+        }
+    }
+
+    let expanded = tmpl.expand().unwrap();
+    assert!(expanded.contains(r#"my => exec"#));
+    assert!(!expanded.contains(r#"my => metrics"#));
+    assert!(expanded.contains(r#"you => exec"#));
+    assert!(expanded.contains(r#"you => metrics"#));
+}