From 9b0aa7362c21b01376739a013126a9db3ce355bc Mon Sep 17 00:00:00 2001
From: tyranron <tyranron@gmail.com>
Date: Mon, 8 Apr 2019 15:11:55 +0300
Subject: Bootstrap solution

---
 src/config.rs | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

(limited to 'src/config.rs')

diff --git a/src/config.rs b/src/config.rs
index f19e59a..893baea 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -129,6 +129,25 @@ impl Config {
         self.refresh()
     }
 
+    pub fn set_defaults<T>(&mut self, value: &T) -> Result<&mut Config>
+    where
+        T: Serialize,
+    {
+        match self.kind {
+            ConfigKind::Mutable {
+                ref mut defaults, ..
+            } => {
+                for (key, val) in Self::try_from(&value)?.collect()? {
+                    defaults.insert(key.parse()?, val);
+                }
+            }
+
+            ConfigKind::Frozen => return Err(ConfigError::Frozen),
+        }
+
+        self.refresh()
+    }
+
     pub fn set<T>(&mut self, key: &str, value: T) -> Result<&mut Config>
     where
         T: Into<Value>,
@@ -192,13 +211,21 @@ impl Config {
         T::deserialize(self)
     }
 
-    /// Attempt to deserialize the entire configuration into the requested type.
+    /// Attempt to serialize the entire configuration from the given type.
     pub fn try_from<T: Serialize>(from: &T) -> Result<Self> {
         let mut serializer = ConfigSerializer::default();
         from.serialize(&mut serializer)?;
         Ok(serializer.output)
     }
 
+    /// Attempt to serialize the entire configuration from the given type
+    /// as default values.
+    pub fn try_defaults_from<T: Serialize>(from: &T) -> Result<Self> {
+        let mut c = Self::new();
+        c.set_defaults(from)?;
+        Ok(c)
+    }
+
     #[deprecated(since = "0.7.0", note = "please use 'try_into' instead")]
     pub fn deserialize<'de, T: Deserialize<'de>>(self) -> Result<T> {
         self.try_into()
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