1 files changed, 66 insertions, 0 deletions
diff --git a/systems/_config/src/rw.rs b/systems/_config/src/rw.rs
new file mode 100644
index 0000000..36ea00c
--- /dev/null
+++ b/systems/_config/src/rw.rs
@@ -0,0 +1,66 @@
+use crate::error::ConfigError;
+use serde::{Deserialize, Serialize};
+use std::path::Path;
+
+pub async fn read_config<C>(path: impl AsRef<Path>) -> Result<C, ConfigError>
+where
+    C: for<'a> Deserialize<'a>,
+{
+    let path_ref = path.as_ref();
+    let ext = path_ref
+        .extension()
+        .and_then(|ext| ext.to_str())
+        .unwrap_or("json");
+    let format = ext_fmt(&ext.to_lowercase());
+
+    let content = std::fs::read_to_string(path_ref).map_err(ConfigError::ConfigReadFailed)?;
+
+    match format {
+        Format::Yaml => {
+            serde_yaml::from_str(&content).map_err(|e| ConfigError::Other(e.to_string()))
+        }
+        Format::Toml => toml::from_str(&content).map_err(|e| ConfigError::Other(e.to_string())),
+        Format::Json => {
+            serde_json::from_str(&content).map_err(|e| ConfigError::Other(e.to_string()))
+        }
+    }
+}
+
+pub async fn write_config<C>(path: impl AsRef<Path>, config: &C) -> Result<(), ConfigError>
+where
+    C: Serialize,
+{
+    let path_ref = path.as_ref();
+    let ext = path_ref
+        .extension()
+        .and_then(|ext| ext.to_str())
+        .unwrap_or("json");
+    let format = ext_fmt(&ext.to_lowercase());
+
+    let content = match format {
+        Format::Yaml => {
+            serde_yaml::to_string(config).map_err(|e| ConfigError::Other(e.to_string()))?
+        }
+        Format::Toml => toml::to_string(config).map_err(|e| ConfigError::Other(e.to_string()))?,
+        Format::Json => {
+            serde_json::to_string_pretty(config).map_err(|e| ConfigError::Other(e.to_string()))?
+        }
+    };
+
+    std::fs::write(path_ref, content).map_err(ConfigError::ConfigWriteFailed)
+}
+
+enum Format {
+    Yaml,
+    Toml,
+    Json,
+}
+
+fn ext_fmt(ext: &str) -> Format {
+    match ext {
+        "yaml" | "yml" => Format::Yaml,
+        "toml" | "tml" => Format::Toml,
+        "json" => Format::Json,
+        _ => Format::Json,
+    }
+}