feat(abigen): search json recursively (#733)

ethers-contract/ethers-contract-abigen/Cargo.toml

@@ -25,6 +25,7 @@ reqwest = { version = "0.11.3", default-features = false, features = ["blocking"
 once_cell = "1.8.0"
 cfg-if = "1.0.0"
 dunce = "1.0.2"
+walkdir = "2.3.2"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 # NOTE: this enables wasm compatibility for getrandom indirectly

ethers-contract/ethers-contract-abigen/src/lib.rs

@@ -266,12 +266,9 @@ impl MultiAbigen {
     /// ```
     pub fn from_json_files(dir: impl AsRef<Path>) -> Result<Self> {
         let mut abis = Vec::new();
-        for file in fs::read_dir(dir)?.into_iter().filter_map(std::io::Result::ok).filter(|p| {
-            p.path().is_file() && p.path().extension().and_then(|ext| ext.to_str()) == Some("json")
-        }) {
-            let file: fs::DirEntry = file;
-            if let Some(file_name) = file.path().file_stem().and_then(|s| s.to_str()) {
-                let content = fs::read_to_string(file.path())?;
+        for file in util::json_files(dir) {
+            if let Some(file_name) = file.file_stem().and_then(|s| s.to_str()) {
+                let content = fs::read_to_string(&file)?;
                 abis.push((file_name.to_string(), content));
             }
         }

ethers-contract/ethers-contract-abigen/src/util.rs

@@ -151,6 +151,17 @@ fn take_while(s: &str, mut predicate: impl FnMut(char) -> bool) -> (&str, &str)
     s.split_at(index)
 }
 
+/// Returns a list of absolute paths to all the json files under the root
+pub fn json_files(root: impl AsRef<std::path::Path>) -> Vec<PathBuf> {
+    walkdir::WalkDir::new(root)
+        .into_iter()
+        .filter_map(Result::ok)
+        .filter(|e| e.file_type().is_file())
+        .filter(|e| e.path().extension().map(|ext| ext == "json").unwrap_or_default())
+        .map(|e| e.path().into())
+        .collect()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;