scripts: Add show-mumi-usage.

1 files changed, 18 insertions, 0 deletions

diff --git a/scripts/mumi.in b/scripts/mumi.in
index 41f2794..566ab7d 100644
--- a/scripts/mumi.in
+++ b/scripts/mumi.in
@@ -111,6 +111,24 @@
      (error "extraneous argument" arg))
    %default-options))
 
+(define (show-mumi-usage)
+  (format (current-error-port)
+          "
+    `mumi web [--listen-repl[=port]] [--disable-mailer]':
+         start the application web server.
+
+    `mumi mailer --sender=SENDER --smtp=SMTP:
+         start a mailer process (requires Redis).
+
+    `mumi worker':
+         run an update loop to refresh issue information from Debbugs.
+
+    `mumi fetch':
+         index all Debbugs bug logs and update bug statuses once.
+
+~%")
+  (exit 1))
+
 (match (cdr (program-arguments))
   (("mailer" . rest)
    (let* ((opts (parse-options rest))