From bd1eb29f61f451885d1f11b05f61023493584fcb Mon Sep 17 00:00:00 2001
From: Sergi Delgado Segura <sergi.delgado.s@gmail.com>
Date: Thu, 1 Dec 2022 12:05:40 +0100
Subject: [PATCH 1/2] Adds Network::to_core_arg

This allows users to create `Network` instances from `bitcoind -chain` values
---
 bitcoin/src/network/constants.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/bitcoin/src/network/constants.rs b/bitcoin/src/network/constants.rs
index 595f3db2..a620e5ea 100644
--- a/bitcoin/src/network/constants.rs
+++ b/bitcoin/src/network/constants.rs
@@ -119,6 +119,28 @@ impl Network {
             Network::Regtest => "regtest",
         }
     }
+
+    /// Converts a `bitcoind -chain` argument name to its equivalent `Network`.
+    ///
+    /// ```bash
+    /// $ bitcoin-23.0/bin/bitcoind --help | grep -C 3 '\-chain=<chain>'
+    /// Chain selection options:
+    ///
+    /// -chain=<chain>
+    /// Use the chain <chain> (default: main). Allowed values: main, test, signet, regtest
+    /// ```
+    pub fn from_core_arg(core_arg: &str) -> Result<Self, ParseNetworkError> {
+        use Network::*;
+
+        let network = match core_arg {
+           "main" => Bitcoin,
+           "test" => Testnet,
+           "signet" => Signet, 
+           "regtest" => Regtest,
+           _ => return Err(ParseNetworkError(core_arg.to_owned())),
+        };
+        Ok(network)
+    }
 }
 
 /// An error in parsing network string.

From d7006ef80d1562da635f10cc435a7cb45f3e440a Mon Sep 17 00:00:00 2001
From: Sergi Delgado Segura <sergi.delgado.s@gmail.com>
Date: Thu, 8 Dec 2022 07:18:34 -0500
Subject: [PATCH 2/2] Adds roundtrip tests for Network::from_core_arg

---
 bitcoin/src/network/constants.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/bitcoin/src/network/constants.rs b/bitcoin/src/network/constants.rs
index a620e5ea..d55ee6ad 100644
--- a/bitcoin/src/network/constants.rs
+++ b/bitcoin/src/network/constants.rs
@@ -599,4 +599,19 @@ mod tests {
             assert_eq!(&magic.to_string(), magic_str);
         }
     }
+
+    #[test]
+    fn from_to_core_arg() {
+        let expected_pairs = [
+            (Network::Bitcoin, "main"),
+            (Network::Testnet, "test"),
+            (Network::Regtest, "regtest"),
+            (Network::Signet, "signet"),
+        ];
+
+        for (net, core_arg) in &expected_pairs {
+            assert_eq!(Network::from_core_arg(core_arg), Ok(*net));
+            assert_eq!(net.to_core_arg(), *core_arg);
+        }
+    }
 }