Add -- as marker for end of options

Any parameter specified after a `--` is treated as a positional argument.

Author: o-lim

spec/cliargs_parsing_spec.lua

@@ -230,13 +230,24 @@ describe("Testing cliargs library parsing commandlines", function()
     assert.is.falsy(result)
   end)
 
-  it("tests optionals + required, no optionals and to many required provided, ", function()
+  it("tests optionals + required, no optionals and too many required provided, ", function()
     populate_required(cli)
     populate_optionals(cli)
     result = cli:parse({ "some_file", "some_other_file" }, true --[[no print]])
     assert.is.falsy(result)
   end)
 
+  it("tests optionals + required + optarg, '--' as end of optionals", function()
+    populate_required(cli)
+    populate_optarg(1)
+    local expected = populate_flags(cli)
+    expected.INPUT = "--input"
+    expected.OUTPUT = "-d"
+    expected.verbose = true
+    local result = cli:parse({ "--verbose", "--", "--input", "-d" })
+    assert.is.same(expected, result)
+  end)
+
   it("tests bad short-key notation, -x=VALUE", function()
     populate_optionals(cli)
     result = cli:parse({ "-o=some_file" }, true --[[no print]])

src/cliargs.lua

@@ -312,6 +312,11 @@ function cli:parse(arguments, noprint, dump)
       break   -- no optional prefix, so options are done
     end
 
+    if opt == "--" then
+      table.remove(args, 1)
+      break   -- end of options
+    end
+
     if optkey:sub(-1,-1) == "=" then  -- check on a blank value eg. --insert=
       optval = ""
       optkey = optkey:sub(1,-2)