feat: expose resvg version (#113)

Author: baseplate-admin

build.rs

@@ -0,0 +1,22 @@
+use std::fs;
+
+fn main() {
+    let lock = fs::read_to_string("Cargo.lock").unwrap();
+
+    let mut lines = lock.lines();
+    while let Some(line) = lines.next() {
+        if line.trim() == "name = \"resvg\"" {
+            if let Some(version_line) = lines.find(|l| l.trim().starts_with("version")) {
+                let version = version_line
+                    .split('=')
+                    .nth(1)
+                    .unwrap()
+                    .trim()
+                    .trim_matches('"');
+
+                println!("cargo:rustc-env=DEP_RESVG_VERSION={version}");
+                break;
+            }
+        }
+    }
+}

src/rust/lib.rs

@@ -446,12 +446,20 @@ fn get_author() -> &'static str {
         env!("CARGO_PKG_AUTHORS").to_owned()
     })
 }
+fn get_resvg_version() -> &'static str{
+    static RESVG_VERSION : std::sync::OnceLock<String> =std::sync::OnceLock::new();
+    
+    RESVG_VERSION.get_or_init(||{
+        env!("DEP_RESVG_VERSION").to_owned()
+    })
+}
 
 /// A Python module implemented in Rust.
 #[pymodule]
 fn resvg_py(_py: Python, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add("__version__", get_version())?;
     m.add("__author__", get_author())?;
+    m.add("__resvg_version__", get_resvg_version())?;
     m.add_function(wrap_pyfunction!(svg_to_bytes, m)?)?;
     Ok(())
 }