libexec/app-resolver-maven: Better argument checking.

lib/common: Starting a way to have a common usage/help semantics.

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/common b/lib/common
index e90f77b..63f712a 100755
--- a/lib/common
+++ b/lib/common
@@ -40,6 +40,21 @@ assert_is_app() {
   fi
 }
 
+usage() {
+  message=${1-}
+
+  if [[ $message != "" ]]
+  then
+    echo $message
+  fi
+
+  if [ "`declare -f usage_inner >/dev/null; echo $?`" = 0 ]
+  then
+    usage_inner >&2
+  fi
+  exit 1
+}
+
 debug() {
   [[ $echo_debug == no ]] || echo "D: $usage_app: $@" 2>&1
 }