split on two crates

Cargo.toml

@@ -5,6 +5,7 @@ members = [
   "crates/fce-test-macro-impl",
   "crates/main",
   "crates/timestamp-macro",
+  "crates/timestamp-macro-impl",
   "crates/wit",
   "fluence",
   "fluence-test"

crates/timestamp-macro-impl/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "fce-timestamp-macro-impl"
+version = "0.5.0"  # remember to update html_root_url
+edition = "2018"
+description = "Implementation of the `#[build_timestamp]` macro"
+repository = "https://github.com/fluencelabs/rust-sdk/crates/timestamp-macro-impl"
+authors = ["Fluence Labs"]
+keywords = ["fluence", "sdk", "webassembly", "procedural_macros"]
+categories = ["api-bindings", "wasm"]
+license = "Apache-2.0"
+
+[lib]
+doctest = false
+
+[dependencies]
+proc-macro2 = "1.0.26"
+syn = { version = '1.0.64', features = ['full'] }
+chrono = "0.4.19"

crates/timestamp-macro-impl/src/lib.rs

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#![deny(
+    dead_code,
+    nonstandard_style,
+    unused_imports,
+    unused_mut,
+    unused_variables,
+    unused_unsafe,
+    unreachable_patterns
+)]
+#![warn(rust_2018_idioms)]
+#![recursion_limit = "1024"]
+
+use proc_macro2::TokenStream;
+
+pub const FORMAT_STRING: &str = "%H:%M:%S / %Y-%m-%d";
+
+pub fn build_timestamp() -> TokenStream {
+    let time = chrono::Utc::now();
+    let formatted_time = time.format(FORMAT_STRING);
+
+    let out_str = format!(r#"const __FCE_SDK_BUILD_TIME: &str = {}"#, formatted_time);
+
+    out_str.parse().expect("time formatting should be correct")
+}

crates/timestamp-macro/Cargo.toml

@@ -2,7 +2,7 @@
 name = "fce-timestamp-macro"
 version = "0.5.0"  # remember to update html_root_url
 edition = "2018"
-description = "Implementation of the `#[build_timestamp]` macro"
+description = "Definition of the `#[build_timestamp]` macro"
 repository = "https://github.com/fluencelabs/rust-sdk/crates/timestamp-macro"
 authors = ["Fluence Labs"]
 keywords = ["fluence", "sdk", "webassembly", "procedural_macros"]
@@ -14,5 +14,4 @@ proc-macro = true
 doctest = false
 
 [dependencies]
-syn = { version = '1.0.64', features = ['full'] }
-chrono = "0.4.19"
+fce-timestamp-macro-impl = { path = "../timestamp-macro-impl", version = "0.5.0" }

crates/timestamp-macro/src/lib.rs

@@ -28,14 +28,7 @@
 
 use proc_macro::TokenStream;
 
-const FORMAT_STRING: &str = "%H:%M:%S / %Y-%m-%d";
-
 #[proc_macro]
 pub fn build_timestamp(_: TokenStream) -> TokenStream {
-    let time = chrono::Utc::now();
-    let formatted_time = time.format(FORMAT_STRING);
-
-    let out_str = format!(r#"const __FCE_SDK_BUILD_TIME: &str = {}"#, formatted_time);
-
-    out_str.parse().expect("time formatting should be correct")
+    fce_timestamp_macro_impl::build_timestamp().into()
 }