From eb73545d64999ed78ea17872efdf33f614df09df Mon Sep 17 00:00:00 2001
From: Ray Andrew <rs@rs.ht>
Date: Fri, 26 Dec 2025 02:07:35 -0600
Subject: [PATCH] feat(email): add `mu` indexer

---
 home/email/default.nix  | 37 ++++++++++++++++++++++++++++++-------
 hosts/dango/default.nix |  1 +
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/home/email/default.nix b/home/email/default.nix
index 6751447..e34d681 100644
--- a/home/email/default.nix
+++ b/home/email/default.nix
@@ -3,6 +3,7 @@
   lib,
   config,
   dots,
+  home-dir,
   xdg-config-dir,
   ...
 }:
@@ -14,6 +15,7 @@
     mbsync = mkEnableOption "Enable Mbsync";
     neomutt = mkEnableOption "Enable NeoMutt";
     notmuch = mkEnableOption "Enable notmuch";
+    mu = mkEnableOption "Enable mu (maildir-utils)";
     mailcap = mkEnableOption "Enable mailcap";
   };
 
@@ -33,8 +35,26 @@
       enable = config.custom.email.mbsync;
       configFile = "${dots}/config/mbsync/mbsyncrc";
       frequency = "*:0/3";
-      extraPackages = with pkgs; [ sops ] ++ lib.optionals config.custom.email.notmuch [ notmuch ];
-      postExec = lib.mkIf config.custom.email.notmuch "${pkgs.notmuch}/bin/notmuch new";
+      extraPackages =
+        with pkgs;
+        [ sops ]
+        ++ lib.optionals config.custom.email.notmuch [ notmuch ]
+        ++ lib.optionals config.custom.email.mu [ mu ];
+      postExec =
+        let
+          notmuchCmd = lib.optionalString config.custom.email.notmuch "${pkgs.notmuch}/bin/notmuch new";
+          muCmd = lib.optionalString config.custom.email.mu ''
+            # Initialize mu if not already done
+            if [ ! -d "${home-dir}/.cache/mu" ] && [ ! -d "${home-dir}/.mu" ]; then
+              ${pkgs.mu}/bin/mu init --maildir=${home-dir}/mail
+            fi
+            ${pkgs.mu}/bin/mu index
+          '';
+        in
+        lib.mkIf (config.custom.email.notmuch || config.custom.email.mu) ''
+          ${notmuchCmd}
+          ${muCmd}
+        '';
       environment = {
         SOPS_AGE_KEY_FILE = "${xdg-config-dir}/sops/age/keys.txt";
       }
@@ -61,6 +81,9 @@
       ++ lib.optionals config.custom.email.notmuch [
         notmuch
       ]
+      ++ lib.optionals config.custom.email.mu [
+        mu
+      ]
       ++ lib.optionals config.custom.email.mailcap [
         mailcap
         w3m # HTML rendering
@@ -88,11 +111,11 @@
 
     # Create mail directories
     home.activation.createMailDirs = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
-      mkdir -p ~/mail/personal/Inbox
-      mkdir -p ~/mail/uchicago/Inbox
-      mkdir -p ~/.cache/neomutt/headers
-      mkdir -p ~/.cache/neomutt/messages
-      mkdir -p ~/.local/state
+      mkdir -p ${home-dir}/mail/personal/Inbox
+      mkdir -p ${home-dir}/mail/uchicago/Inbox
+      mkdir -p ${home-dir}/.cache/neomutt/headers
+      mkdir -p ${home-dir}/.cache/neomutt/messages
+      mkdir -p ${home-dir}/.local/state
     '';
 
     # Set NOTMUCH_CONFIG environment variable
diff --git a/hosts/dango/default.nix b/hosts/dango/default.nix
index 625bd5c..f5bfefa 100644
--- a/hosts/dango/default.nix
+++ b/hosts/dango/default.nix
@@ -111,6 +111,7 @@
       mbsync = true;
       mailcap = true;
       notmuch = true;
+      mu = true;
     };
   };
 }