From ea25d5ff9858a7cc03477f31cb3140a43977e6fd Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Tue, 9 Mar 2021 14:48:47 +0100
Subject: Add a Config::set_once() function to set a value once (and let
 Config::merge() overwrite it later

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 src/config.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/config.rs b/src/config.rs
index 888d8cc..e6da482 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -151,6 +151,18 @@ impl Config {
         self.refresh()
     }
 
+    pub fn set_once(&mut self, key: &str, value: Value) -> Result<()> {
+        let expr: path::Expression = key.parse()?;
+
+        // Traverse the cache using the path to (possibly) retrieve a value
+        if let Some(ref mut val) = expr.get_mut(&mut self.cache) {
+            **val = value;
+        } else {
+            expr.set(&mut self.cache, value);
+        }
+        Ok(())
+    }
+
     pub fn get<'de, T: Deserialize<'de>>(&self, key: &str) -> Result<T> {
         // Parse the key into a path expression
         let expr: path::Expression = key.parse()?;
-- 
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