1 files changed, 66 insertions, 0 deletions
diff --git a/mail-overview/waybar-mail.sh b/mail-overview/waybar-mail.sh
new file mode 100755
index 0000000..06f8427
--- /dev/null
+++ b/mail-overview/waybar-mail.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+#
+# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# Waybar custom module in continuous mode: prints one JSON line per notmuch
+# commit, forever, and waybar redraws on each line. Waybar owns this process,
+# which is why there is no daemon to supervise and no interval to tune.
+#
+# The count is the total across every account. A per account breakdown is the
+# drawer's job; see mail-overview/README.md.
+
+set -u
+
+QUERY='tag:unread and tag:inbox'
+
+# notmuch knows where its own database is, so this follows a moved database
+# without an edit here.
+db="$(notmuch config get database.path 2>/dev/null)/xapian"
+
+emit() {
+    local n
+    n="$(notmuch count "$QUERY" 2>/dev/null)"
+
+    # notmuch exits 0 even for a malformed query, printing something that is
+    # not a count, so the exit status is not the test: the output is. Anything
+    # that is not a plain number is a failure, and a failure must not render
+    # as "no new mail".
+    if [[ ! "$n" =~ ^[0-9]+$ ]]; then
+        printf '{"text":"!","tooltip":"notmuch count failed","class":"error"}\n'
+        return
+    fi
+
+    if [[ "$n" -eq 0 ]]; then
+        printf '{"text":"","class":"empty"}\n'
+    else
+        printf '{"text":"%s","class":"unread"}\n' "$n"
+    fi
+}
+
+if [[ ! -d "$db" ]]; then
+    printf '{"text":"!","tooltip":"no notmuch database","class":"error"}\n'
+    exit 1
+fi
+
+emit
+
+while inotifywait -qq -e close_write,moved_to "$db" 2>/dev/null; do
+    # One commit touches several files. Without this the module redraws three
+    # or four times per sync with intermediate counts.
+    sleep 0.3
+    emit
+done
+
+# Falling out of the loop means inotifywait itself failed. Say so rather than
+# exiting silently, which looks like an empty inbox.
+printf '{"text":"!","tooltip":"mail watcher stopped","class":"error"}\n'
+exit 1