style: code style

__crypto/simple_contract/src/credit_util.rs

@@ -0,0 +1,22 @@
+use std::fs;
+use std::fs::File;
+use rust_util::XResult;
+use crate::credit::CreditContract;
+
+pub fn load_credit_contract(name: &str) -> XResult<CreditContract> {
+    let json = fs::read_to_string(name)?;
+    serde_json::from_str(&json).map_err(|e| e.into())
+}
+
+pub fn save_credit_contract(c: &CreditContract, overwrite: bool) -> XResult<()> {
+    let name = &c.name;
+    if !overwrite {
+        if let Ok(_) = File::open(name) {
+            return simple_error!("File exists: {}", name);
+        }
+    }
+    information!("Write file: {}", name);
+    fs::write(name, serde_json::to_string(c)?.as_bytes())?;
+    Ok(())
+}
+