feat: supports functions in bash/js/python/ruby (#6)

sh/may_execute_command.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -e
+
+# @describe Executes a shell command.
+# @option --command~ Command to execute, such as `ls -la`
+
+main() {
+    eval "$argc_command"
+}
+
+eval "$(argc --argc-eval "$0" "$@")"