rename help_modules to helper

druid/helper/formats.lua

@@ -0,0 +1,34 @@
+local M = {}
+
+local ZERO = "0"
+
+-- Return number with zero number prefix
+-- @param num - number for conversion
+-- @param count - count of numerals
+-- @return string with need count of zero (1,3) -> 001
+function M.add_prefix_zeros(num, count)
+  local result = tostring(num)
+  for i = string.len(result), count - 1 do
+    result = ZERO..result
+  end
+  return result
+end
+
+-- Convert seconds to string minutes:seconds
+-- @param num - number of seconds
+-- @return string minutes:seconds
+function M.second_string_min(sec)
+  local mins = math.floor(sec / 60)
+  local seconds = math.floor(sec - mins * 60)
+  return string.format("%.2d:%.2d", mins, seconds)
+end
+
+-- Interpolate string with named Parameters in Table
+-- @param s - string for interpolate
+-- @param tab - table with parameters
+-- @return string with replaced parameters
+function M.interpolate_strinng(s, tab)
+  return (s:gsub('($%b{})', function(w) return tab[w:sub(3, -2)] or w end))
+end
+
+return M