1 files changed, 93 insertions, 0 deletions
diff --git a/home-manager/modules/programs/lieer.nix b/home-manager/modules/programs/lieer.nix
new file mode 100644
index 00000000000..e34a247af46
--- /dev/null
+++ b/home-manager/modules/programs/lieer.nix
@@ -0,0 +1,93 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.lieer;
+
+  lieerAccounts =
+    filter (a: a.lieer.enable) (attrValues config.accounts.email.accounts);
+
+  nonGmailAccounts =
+    map (a: a.name) (filter (a: a.flavor != "gmail.com") lieerAccounts);
+
+  nonGmailConfigHelp =
+    map (name: ''accounts.email.accounts.${name}.flavor = "gmail.com";'')
+    nonGmailAccounts;
+
+  missingNotmuchAccounts = map (a: a.name)
+    (filter (a: !a.notmuch.enable && a.lieer.notmuchSetupWarning)
+      lieerAccounts);
+
+  notmuchConfigHelp =
+    map (name: "accounts.email.accounts.${name}.notmuch.enable = true;")
+    missingNotmuchAccounts;
+
+  configFile = account: {
+    name = "${account.maildir.absPath}/.gmailieer.json";
+    value = {
+      text = builtins.toJSON {
+        inherit (account.lieer) timeout;
+        account = account.address;
+        replace_slash_with_dot = account.lieer.replaceSlashWithDot;
+        drop_non_existing_label = account.lieer.dropNonExistingLabels;
+        ignore_tags = account.lieer.ignoreTagsLocal;
+        ignore_remote_labels = account.lieer.ignoreTagsRemote;
+      } + "\n";
+    };
+  };
+
+in {
+  meta.maintainers = [ maintainers.tadfisher ];
+
+  options = {
+    programs.lieer.enable =
+      mkEnableOption "lieer Gmail synchronization for notmuch";
+
+    accounts.email.accounts = mkOption {
+      type = with types; attrsOf (submodule (import ./lieer-accounts.nix));
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf (missingNotmuchAccounts != [ ]) {
+      warnings = [''
+        lieer is enabled for the following email accounts, but notmuch is not:
+
+            ${concatStringsSep "\n    " missingNotmuchAccounts}
+
+        Notmuch can be enabled with:
+
+            ${concatStringsSep "\n    " notmuchConfigHelp}
+
+        If you have configured notmuch outside of Home Manager, you can suppress this
+        warning with:
+
+            programs.lieer.notmuchSetupWarning = false;
+      ''];
+    })
+
+    {
+      assertions = [{
+        assertion = nonGmailAccounts == [ ];
+        message = ''
+          lieer is enabled for non-Gmail accounts:
+
+              ${concatStringsSep "\n    " nonGmailAccounts}
+
+          If these accounts are actually Gmail accounts, you can
+          fix this error with:
+
+              ${concatStringsSep "\n    " nonGmailConfigHelp}
+        '';
+      }];
+
+      home.packages = [ pkgs.gmailieer ];
+
+      # Notmuch should ignore non-mail files created by lieer.
+      programs.notmuch.new.ignore = [ "/.*[.](json|lock|bak)$/" ];
+
+      home.file = listToAttrs (map configFile lieerAccounts);
+    }
+  ]);
+}