feat: implement newtype Amount attribute + refactoring

.github/workflows/ci.yaml

@@ -10,6 +10,7 @@ on:
 env:
   CARGO_TERM_COLOR: always
 
+# Allow just one concurrent job per branch.
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -36,6 +37,7 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
+          # Run on macOS and Windows if requested.
           - ${{ contains(github.event.pull_request.labels.*.name,
             'CI-run-on-macos-latest') && 'macos-latest' || '' }}
           - ${{ contains(github.event.pull_request.labels.*.name,

Cargo.toml

@@ -25,5 +25,8 @@ newtype-tools-derive = { version = "0.1.0-beta.9", path = "newtype-tools-derive"
 proc-macro2 = "1.0.106"
 quote = "1.0.45"
 rstest = "0.26.1"
-syn = { version = "2.0.117", features = ["extra-traits", "full"] }
+rustversion = "1.0.22"
+# To debug macro parsing:
+#syn = { version = "2.0.117", features = ["extra-traits", "full"] }
+syn = "2.0.117"
 trybuild = "1.0.116"

Makefile

@@ -21,6 +21,7 @@ help::
 	@echo "    test        Run cargo test."
 	@echo "    trybuild    Overwrite trybuild test results."
 	@echo "  Misc targets:"
+	@echo "    expand      Show macro expansion for a specified test: TEST=from make expand"
 	@echo "    fmt         Run cargo fmt."
 	@echo "    keepsorted  Sort Rust derives alphabetically (cargo install keepsorted)."
 	@echo "    publish     Run the cargo publish dry run."
@@ -62,6 +63,9 @@ trybuild::
 ########################################################################
 ## Misc Targets
 
+expand::
+	cargo expand -p newtype-tools --test ${TEST}
+
 fmt::
 	cargo +nightly fmt -- --config reorder_impl_items=true,error_on_unformatted=true,error_on_line_overflow=true
 

README.md

@@ -44,7 +44,7 @@ use newtype_tools::Newtype;
 
 #[derive(Newtype)]
 #[newtype(
-    into(Oranges, with = "|apples| Oranges((apples.0 / 2) as u32)")
+    into(Oranges, with = |apples| Oranges((apples.0 / 2) as u32))
 )]
 struct Apples(u64);
 struct Oranges(u32);
@@ -65,7 +65,7 @@ use newtype_tools::Newtype;
 
 #[derive(Debug, Newtype)]
 #[newtype(
-    partial_eq(Oranges, with = "|apples, oranges| apples.0 == oranges.0 as u64 * 2")
+    partial_eq(Oranges, with = |apples, oranges| apples.0 == oranges.0 as u64 * 2)
 )]
 struct Apples(u64);
 struct Oranges(u32);