open files with external programs for neomutt

home/email.nix

@@ -11,10 +11,21 @@
   programs.mbsync.enable = true;
   services.mbsync.enable = true;
 
+  home.file.".config/mailcap/config".text =
+    ''
+    image/*; ${lib.getExe (builtins.getAttr "imv" pkgs)} %s
+    text/html; ${lib.getExe (builtins.getAttr config.home.sessionVariables.BROWSER pkgs)} %s
+    application/pdf; ${lib.getExe (builtins.getAttr "zathura" pkgs)} %s
+    '';
+
   programs.neomutt = {
     enable = true;
     sidebar.enable = true;
-    vimKeys = true;
+    # https://github.com/nix-community/home-manager/issues/6185
+    # vimKeys = true;
+    settings = {
+      mailcap_path = "~/.config/mailcap/config";
+    };
   };
 
   accounts.email.maildirBasePath = "Mail";

home/home.nix

@@ -51,6 +51,12 @@
     enable = true;
     mime.enable = true;
     mimeApps.enable = true;
+    mimeApps.defaultApplications = {
+      "application/pdf" = "zathura.desktop";
+      "image/*" = "imv.desktop";
+      "text/html" = "librewolf.desktop";
+    };
+    mimeApps.defaultApplicationPackages = with pkgs; [imv librewolf zathura];
     userDirs.enable = true;
   }
   // lib.optionalAttrs (!stable) {

hosts/talos/configuration.nix

@@ -87,6 +87,7 @@
       slurp
       wireshark
       brightnessctl
+      mailcap
     ];
   };