Lua: add ability for scripts loaded from command-line to be passed arguments

This change adds the ability to pass on to lua scripts loaded from the
command-line (tshark or wireshark) additional arguments supplied by the
command-line.  This will help us in our testsuites, but also might be
useful for user-created scripts.  The additional arguments are passed in
using the '-X' eXtension switch.

Change-Id: Ib94cdf1ffd194ca84692fee7816665e4ff95efbd
Reviewed-on: https://code.wireshark.org/review/156
Reviewed-by: Evan Huus <eapache@gmail.com>
Tested-by: Evan Huus <eapache@gmail.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/test/lua/script_args.lua b/test/lua/script_args.lua
new file mode 100755
index 0000000000..2bf9d47025
--- /dev/null
+++ b/test/lua/script_args.lua
@@ -0,0 +1,36 @@
+----------------------------------------
+-- This just verifies the number of args it got is what it expected.
+-- The first arg should be a number, for how many total args to expect,
+-- including itself.
+
+local function testing(...)
+    print("---- Testing "..tostring(...).." ----")
+end
+
+local function test(name, result)
+    io.stdout:write("test "..name.."...")
+    if result == true then
+        io.stdout:write("passed\n")
+    else
+        io.stdout:write("failed!\n")
+        error(name.." test failed!")
+    end
+end
+
+-----------------------------
+
+testing("Command-line args")
+
+local arg={...} -- get passed-in args
+
+test("arg1", arg ~= nil and #arg > 0)
+
+local numargs = tonumber(arg[1])
+test("arg2", numargs ~= nil)
+
+test("arg3", #arg == numargs)
+
+print("\n-----------------------------\n")
+
+print("All tests passed!\n\n")
+