mu: allow aliases to be used by mu configuration file

This has no effect if the user does not have any aliases defined for
any accounts.

This will also only add `--my-address=` to only accounts that are
enabled to be tracked by mu.

modules/programs/mu.nix

@@ -12,12 +12,14 @@ let
   # Takes the list of accounts with mu.enable = true, and generates a
   # command-line flag for initializing the mu database.
   myAddresses = let
-    # List of account sets where mu.enable = true.
+    # Set of email account sets where mu.enable = true.
     muAccounts =
       filter (a: a.mu.enable) (attrValues config.accounts.email.accounts);
     addrs = map (a: a.address) muAccounts;
-    # Prefix --my-address= to each account's address with mu.enable.
-    addMyAddress = map (addr: "--my-address=" + addr) addrs;
+    # Construct list of lists containing email aliases, and flatten
+    aliases = flatten (map (a: a.aliases) muAccounts);
+    # Prefix --my-address= to each account's address AND all defined aliases
+    addMyAddress = map (addr: "--my-address=" + addr) (addrs ++ aliases);
   in concatStringsSep " " addMyAddress;
 
 in {

tests/default.nix

@@ -76,6 +76,7 @@ import nmt {
     ./modules/programs/man
     ./modules/programs/mbsync
     ./modules/programs/mpv
+    ./modules/programs/mu
     ./modules/programs/ncmpcpp
     ./modules/programs/ne
     ./modules/programs/neomutt

tests/modules/programs/mu/basic-configuration.nix

@@ -0,0 +1,24 @@
+{ ... }:
+
+{
+  imports = [ ../../accounts/email-test-accounts.nix ];
+
+  accounts.email.accounts = {
+    "hm@example.com" = {
+      mu.enable = true;
+      aliases = [ "foo@example.com" ];
+    };
+  };
+
+  programs.mu.enable = true;
+
+  test.stubs.mu = { };
+
+  nmt.script = ''
+    assertFileContains activate \
+      'if [[ ! -d "/home/hm-user/.cache/mu" ]]; then'
+
+    assertFileContains activate \
+      '$DRY_RUN_CMD mu init --maildir=/home/hm-user/Mail --my-address=hm@example.com --my-address=foo@example.com $VERBOSE_ARG;'
+  '';
+}

tests/modules/programs/mu/default.nix

@@ -0,0 +1 @@
+{ mu-basic-configuration = ./basic-configuration.nix; }