fix: support True/False parse to bool

Author: hengfeiyang

examples/config.rs

@@ -3,7 +3,7 @@ use dotenvy::dotenv;
 
 #[derive(Debug, EnvConfig)]
 struct Config {
-    #[env_config(default = "192.168.2.1")]
+    #[env_config(name = "ZINC_SERVER_ADDR", default = "192.168.2.1")]
     server_addr: String,
     server_mode: bool,
     #[env_config(name = "ZINC_FOO", default = true)]

templates/builder.j2

@@ -7,9 +7,9 @@ impl {{ name }} {
         {% else %}
         key = "{{ field.attr_name }}";
         {% endif %}
-        {% if contains(["usize","i16","i32","i64","u16","u32","u64","f32","f64","String","bool"], field.typ) %}
+        {% if contains(["usize","i16","i32","i64","u16","u32","u64","f32","f64","bool"], field.typ) %}
         let {{ field.name }}: Option<{{ field.typ }}> = match std::env::var(key) {
-            Ok(val) => match val.parse() {
+            Ok(val) => match val.to_lowercase().parse() {
                 Ok(v) => Some(v),
                 Err(_) => Some("".parse().unwrap()),
             },
@@ -21,6 +21,17 @@ impl {{ name }} {
                 {% endif %}
             }
         };
+        {% else if field.typ == "String" %}
+        let {{ field.name }}: Option<{{ field.typ }}> = match std::env::var(key) {
+            Ok(val) => Some(val),
+            Err(err) => {
+                {% if field.attr_default.is_empty() %}
+                Some(Default::default())
+                {% else %}
+                Some("{{ field.attr_default }}".parse().unwrap())
+                {% endif %}
+            }
+        };
         {% else %}
         let {{ field.name }}: Option<{{ field.typ }}> = match {{ field.typ }}::init() {
             Ok(v) => Some(v),