added test

example/cmd/_test/cmd-clink.lua

@@ -0,0 +1,18 @@
+local function example_completion(word, word_index, line_state, match_builder) 
+  args = { "example", "_carapace", "fish", "\"\"" } 
+  for i = 2,word_index,1 do 
+    table.insert(args, line_state:getword(i)) 
+  end 
+  -- table.insert(args, word) 
+
+  output = io.popen(table.concat(args, " ")):read("*a") 
+  for line in string.gmatch(output, '[^\r\n]+') do 
+    -- match_builder:addmatch(line) 
+    match_builder:addmatch(string.gsub(line, '\t.*', "")) 
+  end 
+
+  return true 
+end 
+
+clink.argmatcher("example"):addarg({example_completion}):loop(1)
+