Add dynamic version constant feature

* Add custom build script to generate VERSION constant from Cargo.toml
version field

src/bindgen.rs

@@ -94,6 +94,11 @@ fn create_lib_dir(output_path: &Path) -> io::Result<()> {
         output_path.file_name().unwrap().to_string_lossy()
     )?;
 
+	fs::write(
+		output_path.join("build.rs"),
+		include_str!("templates/build.rs.template"),
+	)?;
+
     // Create the "README.md" file.
     fs::write(
         output_path.join("README.md"),

src/templates/Cargo.toml.template

@@ -3,13 +3,17 @@ name = "{}"
 version = "0.1.0"
 authors = ["Your Name"]
 edition = "2021"
+build = "build.rs"
 
 [lib]
 path = "src/lib.rs"
 
+[build-dependencies]
+toml = "0.8.19"
+
 [dependencies]
 serde = {{ version = "1.0.195", features = ["derive"] }}
 serde_json = "1.0.108"
 serde_qs = "0.12.0"
 chrono = "0.4.31"
-reqwest = {{ version = "0.11.22", features = ["blocking", "json"] }}
+reqwest = {{ version = "0.11.22", features = ["blocking", "json"] }}

src/templates/build.rs.template

@@ -0,0 +1,26 @@
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use toml::Value;
+
+fn main() {
+    let manifest_path = Path::new("Cargo.toml");
+
+    let content =
+        std::fs::read_to_string(manifest_path).expect("Unable to read manifest to string.");
+    let parsed_toml: Value = content.parse().expect("Failed to parse toml!");
+
+    let version = parsed_toml["package"]["version"]
+        .as_str()
+        .unwrap_or("0.0.0");
+
+    let version_file_path = Path::new("src").join("version.rs");
+    let mut file = File::create(version_file_path).expect("Unable to create version.rs!");
+    writeln!(
+        file,
+        "#[allow(dead_code)]\npub const VERSION: &str = \"{}\";",
+        version
+    )
+    .expect("Unable to write to file!");
+}
+