neomutt: add module

PR #1002

modules/accounts/email.nix

@@ -391,6 +391,7 @@ in
         (import ../programs/getmail-accounts.nix)
         (import ../programs/mbsync-accounts.nix)
         (import ../programs/msmtp-accounts.nix)
+        (import ../programs/neomutt-accounts.nix)
         (import ../programs/notmuch-accounts.nix)
         (import ../programs/offlineimap-accounts.nix)
       ]);

modules/misc/news.nix

@@ -1311,6 +1311,13 @@ in
           A new module is available: 'services.grobi'.
         '';
       }
+
+      {
+        time = "2020-01-26T19:37:57+00:00";
+        message = ''
+          A new module is available: 'programs.neomutt'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -78,6 +78,7 @@ let
     (loadModule ./programs/mercurial.nix { })
     (loadModule ./programs/mpv.nix { })
     (loadModule ./programs/msmtp.nix { })
+    (loadModule ./programs/neomutt.nix { })
     (loadModule ./programs/neovim.nix { })
     (loadModule ./programs/newsboat.nix { })
     (loadModule ./programs/noti.nix { })

modules/programs/neomutt-accounts.nix

@@ -0,0 +1,35 @@
+{ config, lib, ... }:
+
+with lib;
+
+{
+  options.neomutt = {
+    enable = mkEnableOption "NeoMutt";
+
+    sendMailCommand = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      example = "msmtpq --read-envelope-from --read-recipients";
+      description = ''
+        Command to send a mail. If not set, neomutt will be in charge of sending mails.
+      '';
+    };
+
+    extraConfig = mkOption {
+      type = types.lines;
+      default = "";
+      example = "color status cyan default";
+      description = ''
+        Extra lines to add to the folder hook for this account.
+      '';
+    };
+  };
+
+  config = mkIf config.neomutt.enable {
+    neomutt.sendMailCommand = mkOptionDefault (
+      if config.msmtp.enable
+      then "msmtpq --read-envelope-from --read-recipients"
+      else null
+    );
+  };
+}

modules/programs/neomutt.nix

@@ -0,0 +1,319 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.neomutt;
+
+  neomuttAccounts = filter (a: a.neomutt.enable)
+      (attrValues config.accounts.email.accounts);
+
+  sidebarModule = types.submodule {
+    options = {
+      enable = mkEnableOption "sidebar support";
+
+      width = mkOption {
+        type = types.int;
+        default = 22;
+        description = "Width of the sidebar";
+      };
+
+      shortPath = mkOption {
+        type = types.bool;
+        default = true;
+        description = ''
+          By default sidebar shows the full path of the mailbox, but
+          with this enabled only the relative name is shown.
+        '';
+      };
+
+      format = mkOption {
+        type = types.str;
+        default = "%B%?F? [%F]?%* %?N?%N/?%S";
+        description = ''
+          Sidebar format. Check neomutt documentation for details.
+        '';
+      };
+    };
+  };
+
+  bindModule = types.submodule {
+    options = {
+      map = mkOption {
+        type = types.enum [
+          "alias"
+          "attach"
+          "browser"
+          "compose"
+          "editor"
+          "generic"
+          "index"
+          "mix"
+          "pager"
+          "pgp"
+          "postpone"
+          "query"
+          "smime"
+        ];
+        default = "index";
+        description = "Select the menu to bind the command to.";
+      };
+
+      key = mkOption {
+        type = types.str;
+        example = "<left>";
+        description = "The key to bind.";
+      };
+
+      action = mkOption {
+        type = types.str;
+        example = "<enter-command>toggle sidebar_visible<enter><refresh>";
+        description = "Specify the action to take.";
+      };
+    };
+  };
+
+  yesno = x: if x then "yes" else "no";
+  setOption = n: v: if v == null then "unset ${n}" else "set ${n}=${v}";
+  escape = replaceStrings ["%"] ["%25"];
+
+  accountFilename = account:
+    config.xdg.configHome + "/neomutt/" + account.name;
+
+  genCommonFolderHooks = account: with account;
+    {
+      from = "'${address}'";
+      realname = "'${realName}'";
+      spoolfile = "'+${folders.inbox}'";
+      record = if folders.sent == null then null else "'+${folders.sent}'";
+      postponed = "'+${folders.drafts}'";
+      trash = "'+${folders.trash}'";
+    };
+
+  mtaSection = account: with account;
+    let
+      passCmd = concatStringsSep " " passwordCommand;
+    in
+      if neomutt.sendMailCommand != null then {
+        sendmail = "'${neomutt.sendMailCommand}'";
+      } else let
+        smtpProto = if smtp.tls.enable then "smtps" else "smtp";
+        smtpBaseUrl = "${smtpProto}://${escape userName}@${smtp.host}";
+      in {
+        smtp_url = "'${smtpBaseUrl}'";
+        smtp_pass = "'`${passCmd}`'";
+      };
+
+  genMaildirAccountConfig = account: with account;
+    let
+      folderHook =
+        mapAttrsToList setOption (
+          genCommonFolderHooks account
+          // { folder = "'${account.maildir.absPath}'"; }
+        )
+        ++ optional (neomutt.extraConfig != "") neomutt.extraConfig;
+    in
+      ''
+        ${concatStringsSep "\n" folderHook}
+      '';
+
+  registerAccount = account: with account;
+    ''
+      # register account ${name}
+      mailboxes "${account.maildir.absPath}/${folders.inbox}"
+      folder-hook ${account.maildir.absPath}/ " \
+          source ${accountFilename account} "
+    '';
+
+  mraSection = account: with account;
+    if account.maildir != null
+    then genMaildirAccountConfig account
+    else throw "Only maildir is supported at the moment";
+
+    optionsStr = attrs:
+      concatStringsSep "\n" (mapAttrsToList setOption attrs);
+
+
+  sidebarSection = ''
+    # Sidebar
+    set sidebar_visible = yes
+    set sidebar_short_path = ${yesno cfg.sidebar.shortPath}
+    set sidebar_width = ${toString cfg.sidebar.width}
+    set sidebar_format = '${cfg.sidebar.format}'
+  '';
+
+  bindSection =
+    concatMapStringsSep
+      "\n"
+      (bind: "bind ${bind.map} ${bind.key} \"${bind.action}\"")
+      cfg.binds;
+
+  macroSection =
+    concatMapStringsSep
+      "\n"
+      (bind: "macro ${bind.map} ${bind.key} \"${bind.action}\"")
+      cfg.macros;
+
+  mailCheckSection = ''
+    set mail_check_stats
+    set mail_check_stats_interval = ${toString cfg.checkStatsInterval}
+  '';
+
+  notmuchSection = account: with account; ''
+    # notmuch section
+    set nm_default_uri = "notmuch://${config.accounts.email.maildirBasePath}"
+    virtual-mailboxes "My INBOX" "notmuch://?query=tag:inbox"
+  '';
+
+  accountStr = account: with account; ''
+    # Generated by Home Manager.
+    set ssl_force_tls = yes
+    set certificate_file=${config.accounts.email.certificatesFile}
+
+    # GPG section
+    set crypt_use_gpgme = yes
+    set crypt_autosign = ${yesno (gpg.signByDefault or false)}
+    set pgp_use_gpg_agent = yes
+    set mbox_type = ${if maildir != null then "Maildir" else "mbox"}
+    set sort = "${cfg.sort}"
+
+    # MTA section
+    ${optionsStr (mtaSection account)}
+
+    ${optionalString (cfg.checkStatsInterval != null) mailCheckSection}
+
+    ${optionalString cfg.sidebar.enable sidebarSection}
+
+    # MRA section
+    ${mraSection account}
+
+    # Extra configuration
+    ${account.neomutt.extraConfig}
+  ''
+  + optionalString (account.signature.showSignature != "none") ''
+    set signature = ${pkgs.writeText "signature.txt" account.signature.text}
+  ''
+  + optionalString account.notmuch.enable (notmuchSection account);
+
+in
+
+{
+  options = {
+    programs.neomutt = {
+      enable = mkEnableOption "the NeoMutt mail client";
+
+      sidebar = mkOption {
+        type = sidebarModule;
+        default = {};
+        description = "Options related to the sidebar.";
+      };
+
+      binds = mkOption {
+        type = types.listOf bindModule;
+        default = [];
+        description = "List of keybindings.";
+      };
+
+      macros = mkOption {
+        type = types.listOf bindModule;
+        default = [];
+        description = "List of macros.";
+      };
+
+      sort = mkOption {
+        type = types.enum [
+          "date"
+          "date-received"
+          "from"
+          "mailbox-order"
+          "score"
+          "size"
+          "spam"
+          "subject"
+          "threads"
+          "to"
+        ];
+        default = "threads";
+        description = "Sorting method on messages.";
+      };
+
+      vimKeys = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Enable vim-like bindings.";
+      };
+
+      checkStatsInterval = mkOption {
+        type = types.nullOr types.int;
+        default = null;
+        example = 60;
+        description = "Enable and set the interval of automatic mail check.";
+      };
+
+      editor = mkOption {
+        type = types.str;
+        default = "$EDITOR";
+        description = "Select the editor used for writing mail.";
+      };
+
+      settings = mkOption {
+        type = types.attrsOf types.str;
+        default = {};
+        description = "Extra configuration appended to the end.";
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Extra configuration appended to the end.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ pkgs.neomutt ];
+    home.file = let
+      rcFile = account: {
+        "${accountFilename account}".text = accountStr account;
+      };
+    in
+      foldl' (a: b: a // b) {} (map rcFile neomuttAccounts);
+
+    xdg.configFile."neomutt/neomuttrc" = mkIf (neomuttAccounts != []) {
+      text =
+        let
+          primary = filter (a: a.primary) neomuttAccounts;
+        in
+          ''
+            # Generated by Home Manager.
+            set header_cache = "${config.xdg.cacheHome}/neomutt/headers/"
+            set message_cachedir = "${config.xdg.cacheHome}/neomutt/messages/"
+            set editor = "${cfg.editor}"
+            set implicit_autoview = yes
+
+            alternative_order text/enriched text/plain text
+
+            set delete = yes
+
+            # Binds
+            ${bindSection}
+
+            # Macros
+            ${macroSection}
+
+            ${optionalString cfg.vimKeys "source ${pkgs.neomutt}/share/doc/neomutt/vim-keys/vim-keys.rc"}
+
+            # Extra configuration
+            ${optionsStr cfg.settings}
+
+            ${cfg.extraConfig}
+          ''
+          +
+          concatMapStringsSep "\n" registerAccount neomuttAccounts
+          +
+          # source primary account
+          "source ${accountFilename (builtins.head primary)}";
+    };
+  };
+}