Shifting minetest interactions to nested functions

modpol/interactions/interactions.lua

@@ -95,7 +95,6 @@ function modpol.interactions.org_dashboard(user, org_name)
    process:interact(user)
 end
 
--- ===================================================================
 -- Function: modpol.interactions.message
 -- input: user (string), message (string)
 -- output: prints message to CLI
@@ -103,7 +102,6 @@ function modpol.interactions.message(user, message)
    print(user .. ": " .. message)
 end
 
--- ===================================================================
 -- Function: modpol.interactions.text_query
 -- input: User (string), Query (string), func (function)
 --   func input: user input (string)
@@ -114,12 +112,49 @@ function modpol.interactions.text_query(user, query, func)
    func(answer)
 end
 
--- ===================================================================
+-- Function: dropdown_query
+-- input: user (string), label (string), options (table of strings), func(choice) (function)
+--   func input: choice (string)
+-- output: calls func on choice
+function modpol.interactions.dropdown_query(user, label, options, func)
+   -- set up options
+   local options_display = ""
+   local options_number = 0
+   for k,v in ipairs(options) do
+      options_display = options_display .. k .. ". " ..
+         options[k] .. "\n"
+      options_number = options_number + 1
+   end
+   options_display = options_display .. "Select number:"
+   if options_number == 0 then
+      print("Error: No options given for dropdown")
+      return nil      
+   end
+   -- begin displaying
+   print(user .. ": " .. label)
+   print(options_display)
+   -- read input and produce output
+   local answer
+   answer = io.read()
+   answer = tonumber(answer)
+   if answer then
+      if answer >= 1 and answer <= options_number then
+         print("Selection: " .. options[answer])
+         func(options[answer])
+      else
+         print("Error: Not in dropdown range")
+         return nil
+      end
+   else
+      print("Error: Must be a number")
+      return nil
+   end
+end
+
 -- Function: modpol.binary_poll_user(user, question)
 -- Params: user (string), question (string), func (function)
 --   func input: user input (string: y/n)
 -- Output: Applies "func" to user input
--- presents a yes/no poll to a user, returns answer
 function modpol.interactions.binary_poll_user(user, question, func)
    local query = "Poll for " .. user .. " (y/n): ".. question
    local answer