string: add title_case

.test/tests.lua

@@ -6,6 +6,7 @@ package.path = package.path .. ";../?.lua"
 local assert = require("batteries.assert")
 local tablex = require("batteries.tablex")
 local identifier = require("batteries.identifier")
+local stringx = require("batteries.stringx")
 
 -- tablex {{{
 
@@ -196,3 +197,10 @@ local function test_ulid()
 		assert(not ulid:match("[ILOU%l]"))
 	end
 end
+
+-- stringx
+local function test_title_case()
+    local str = "the quick brown fox jumps over the lazy dog"
+
+    assert(stringx.title_case(str) == "The Quick Brown Fox Jumps Over The Lazy Dog")
+end

stringx.lua

@@ -288,4 +288,13 @@ function stringx.split_and_trim(s, delim)
 	return s
 end
 
+--titlizes a string
+--"quick brown fox" becomes "Quick Brown Fox"
+function stringx.title_case(s)
+    s = s:gsub("%s%l", string.upper)
+    s = s:gsub("^%l", string.upper)
+
+    return s
+end
+
 return stringx