From a6475e3e6082c80726ca2b0f79c9fde4556e227f Mon Sep 17 00:00:00 2001
From: Matthieu Coudron <mattator@gmail.com>
Date: Mon, 21 Jan 2019 17:14:22 +0900
Subject: [PATCH] git: generate identities from mail accounts

(cherry picked from commit a68c8cf5f1567faf02631c6d815daad2166bf26b)
---
 modules/programs/git.nix | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/modules/programs/git.nix b/modules/programs/git.nix
index e8018dc1..9b7858bf 100644
--- a/modules/programs/git.nix
+++ b/modules/programs/git.nix
@@ -63,7 +63,10 @@ in
         type = types.package;
         default = pkgs.git;
         defaultText = "pkgs.git";
-        description = "Git package to install.";
+        description = ''
+          Git package to install. Use <varname>pkgs.gitAndTools.gitFull</varname>
+          to gain access to <command>git send-email</command> for instance.
+        '';
       };
 
       userName = mkOption {
@@ -142,6 +145,26 @@ in
         };
       }
 
+      {
+        programs.git.iniContent =
+          let
+            hasSmtp = name: account: account.smtp != null;
+
+            genIdentity = name: account: with account;
+              nameValuePair "sendemail.${name}" ({
+                smtpEncryption = if smtp.tls.enable then "tls" else "";
+                smtpServer = smtp.host;
+                smtpUser = userName;
+                from = address;
+              }
+              // optionalAttrs (smtp.port != null) {
+                smtpServerPort = smtp.port;
+              });
+          in
+            mapAttrs' genIdentity
+              (filterAttrs hasSmtp config.accounts.email.accounts);
+      }
+
       (mkIf (cfg.signing != null) {
         programs.git.iniContent = {
           user.signingKey = cfg.signing.key;