Allow reading from / passing a built-in vars apart from user vars lik…

…e before

that's also how win ahk does it

src/cmd/math/env-add.cr

@@ -7,7 +7,7 @@ class Cmd::Math::EnvAdd < Cmd::Base
 		var, add_value = args
 		time_units = args[2]?
 
-		current_value = thread.runner.get_user_var(var)
+		current_value = thread.get_var(var)
 		pure_int = ! current_value.includes?('.') && ! add_value.includes?('.')
 		add_value = add_value.to_f64?
 

src/cmd/math/env-div.cr

@@ -5,7 +5,7 @@ class Cmd::Math::EnvDiv < Cmd::Base
 
 	def run(thread, args)
 		var, div_value = args
-		current_value = thread.runner.get_user_var(var)
+		current_value = thread.get_var(var)
 		pure_int = ! current_value.includes?('.') && ! div_value.includes?('.')
 		div_value = div_value.to_f64? || 0
 		current_value = current_value.to_f64? || 0

src/cmd/math/env-mult.cr

@@ -5,7 +5,7 @@ class Cmd::Math::EnvMult < Cmd::Base
 
 	def run(thread, args)
 		var, mult_value = args
-		current_value = thread.runner.get_user_var(var)
+		current_value = thread.get_var(var)
 		pure_int = ! current_value.includes?('.') && ! mult_value.includes?('.')
 		mult_value = mult_value.to_f64? || 0
 		current_value = current_value.to_f64? || 0

src/cmd/string/reg-ex-get-pos.cr

@@ -7,7 +7,7 @@ class Cmd::String::RegExGetPos < Cmd::Base
 		out_var, in_var, search_text = args
 		search_text = Regex.new(search_text, Regex::Options::IGNORE_CASE)
 		opt = (args[3]? || "").downcase
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		if opt == "1" || opt == "r"
 			i = text.rindex(search_text) || -1
 		else

src/cmd/string/reg-ex-replace.cr

@@ -9,7 +9,7 @@ class Cmd::String::RegExReplace < Cmd::Base
 		replace_text = args[3]? || ""
 		opt = (args[4]? || "").downcase
 		replace_all = opt == "1" || opt == "a" || opt == "all"
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		if replace_all
 			replaced = text.gsub(search_text, replace_text)
 		else

src/cmd/string/string-get-pos.cr

@@ -7,7 +7,7 @@ class Cmd::String::StringGetPos < Cmd::Base
 		out_var, in_var, search_text = args
 		search_text = Regex.new(Regex.escape(search_text), Regex::Options::IGNORE_CASE)
 		opt = (args[3]? || "").downcase
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		if opt == "1" || opt == "r"
 			i = text.rindex(search_text) || -1
 		else

src/cmd/string/string-left.cr

@@ -5,7 +5,7 @@ class Cmd::String::StringLeft < Cmd::Base
 	def run(thread, args)
 		out_var, in_var, count = args
 		count = count.to_i?
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		return if ! count || count < 1 || text.empty?
 		text = text[0, count]
 		return if ! text

src/cmd/string/string-len.cr

@@ -4,7 +4,7 @@ class Cmd::String::StringLen < Cmd::Base
 	def self.max_args; 2 end
 	def run(thread, args)
 		out_var, in_var = args
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		thread.runner.set_user_var(out_var, text.size.to_s)
 	end
 end

src/cmd/string/string-lower.cr

@@ -5,7 +5,7 @@ class Cmd::String::StringLower < Cmd::Base
 	def run(thread, args)
 		out_var, in_var = args
 		title_case = args[2]? && args[2].downcase == "t"
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		if title_case
 			text = text.titleize
 		else

src/cmd/string/string-mid.cr

@@ -11,7 +11,7 @@ class Cmd::String::StringMid < Cmd::Base
 		if ! count || count < 1
 			text = ""
 		else
-			text = thread.runner.get_user_var(in_var)
+			text = thread.get_var(in_var)
 			text = text[start, count]
 		end
 		thread.runner.set_user_var(out_var, text)

src/cmd/string/string-replace.cr

@@ -9,7 +9,7 @@ class Cmd::String::StringReplace < Cmd::Base
 		replace_text = args[3]? || ""
 		opt = (args[4]? || "").downcase
 		replace_all = opt == "1" || opt == "a" || opt == "all"
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		if replace_all
 			replaced = text.gsub(search_text, replace_text)
 		else

src/cmd/string/string-right.cr

@@ -5,7 +5,7 @@ class Cmd::String::StringRight < Cmd::Base
 	def run(thread, args)
 		out_var, in_var, count = args
 		count = count.to_i?
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		return if ! count || count < 1 || text.empty?
 		count = text.size if count > text.size
 		text = text[text.size - count, text.size]

src/cmd/string/string-upper.cr

@@ -5,7 +5,7 @@ class Cmd::String::StringUpper < Cmd::Base
 	def run(thread, args)
 		out_var, in_var = args
 		title_case = args[2]? && args[2].downcase == "t"
-		text = thread.runner.get_user_var(in_var)
+		text = thread.get_var(in_var)
 		if title_case
 			text = text.titleize
 		else