Add checks for string arguments

lua/libmodal/src/Mode.lua

@@ -10,6 +10,7 @@ local ParseTable = require('libmodal/src/collections/ParseTable')
 local utils      = require('libmodal/src/utils')
 local Vars       = require('libmodal/src/Vars')
 
+local vim = vim
 local api = vim.api
 
 --[[
@@ -199,14 +200,21 @@ function _metaMode:_inputLoop()
 	-- Set the global input variable to the new input.
 	self.input:nvimSet(userInput)
 
-	-- Make sure that the user doesn't want to exit.
-	if not self.exit.supress
-	   and userInput == globals.ESC_NR then return false
-	-- If the second argument was a dict, parse it.
-	elseif type(self._instruction) == globals.TYPE_TBL then
-		self:_checkInputForMapping()
-	else -- the second argument was a function; execute it.
-		self._instruction()
+	if not self.exit.supress and userInput == globals.ESC_NR then -- The user wants to exit.
+		return false -- As in, "I don't want to continue."
+	else -- The user wants to continue.
+
+		--[[ The instruction type is determined every cycle, because the user may be assuming a more direct control
+			over the instruction and it may change over the course of execution. ]]
+		local instructionType = type(self._instruction)
+
+		if instructionType == globals.TYPE_TBL then -- The second argument was a dict. Parse it.
+			self:_checkInputForMapping()
+		elseif instructionType == globals.TYPE_STR and vim.fn then -- It is the name of a VimL function. This only works in Neovim 0.5+.
+			vim.fn[self._instruction]()
+		else -- the second argument was a function; execute it.
+			self._instruction()
+		end
 	end
 
 	return true

lua/libmodal/src/Prompt.lua

@@ -7,6 +7,7 @@
 local globals   = require('libmodal/src/globals')
 local utils     = require('libmodal/src/utils')
 
+local vim = vim
 local api  = vim.api
 
 --[[
@@ -64,16 +65,18 @@ function _metaPrompt:_inputLoop()
 	local instruction = self._instruction
 
 	-- determine what to do with the input
-	if string.len(userInput) > 0 then -- the user actually entered something
+	if string.len(userInput) > 0 then -- The user actually entered something.
 		self.input:nvimSet(userInput)
-		if type(instruction) == globals.TYPE_TBL then -- the instruction is a command table.
-			if instruction[userInput] then -- there is a defined command for the input.
+		if type(instruction) == globals.TYPE_TBL then -- The instruction is a command table.
+			if instruction[userInput] then -- There is a defined command for the input.
 				api.nvim_command(instruction[userInput])
-			elseif userInput == _HELP then -- the user did not define a 'help' command, so use the default.
+			elseif userInput == _HELP then -- The user did not define a 'help' command, so use the default.
 				self._help:show()
 			else -- show an error.
 				utils.api.nvim_show_err(globals.DEFAULT_ERROR_TITLE, 'Unknown command')
 			end
+		elseif type(instruction) == globals.TYPE_STR and vim.fn then -- The instruction is a function. Works on Neovim 0.5+.
+			vim.fn[instruction]()
 		else -- attempt to call the instruction.
 			instruction()
 		end