From 592fe6a08761fa42f2991d02ee624d60b39dc258 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mislav=20Marohni=C4=87?= <git@mislav.net>
Date: Tue, 11 Jul 2023 18:54:38 +0200
Subject: [PATCH] help: have `--usage` always print a usage line

---
 libexec/rbenv-help |  6 +++++-
 test/help.bats     | 12 ++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/libexec/rbenv-help b/libexec/rbenv-help
index ef041525..84d6e464 100755
--- a/libexec/rbenv-help
+++ b/libexec/rbenv-help
@@ -144,7 +144,11 @@ print_usage() {
   local command="$1"
   local summary usage help
   eval "$(documentation_for "$command")"
-  [ -z "$usage" ] || echo "$usage"
+  if [ -n "$usage" ]; then
+    echo "$usage"
+  else
+    echo "Usage: rbenv ${command}"
+  fi
 }
 
 unset usage
diff --git a/test/help.bats b/test/help.bats
index 256549ee..3102136d 100644
--- a/test/help.bats
+++ b/test/help.bats
@@ -71,6 +71,18 @@ SH
   assert_success "Usage: rbenv hello <world>"
 }
 
+@test "empty usage section" {
+  mkdir -p "${RBENV_TEST_DIR}/bin"
+  cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH
+#!shebang
+# Summary: Says "hello" to you, from rbenv
+echo hello
+SH
+
+  run rbenv-help --usage hello
+  assert_success "Usage: rbenv hello"
+}
+
 @test "multiline usage section" {
   mkdir -p "${RBENV_TEST_DIR}/bin"
   cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH