src/ln: change formatter argument to a table with formatter

spec/ln_spec.lua

@@ -1,62 +1,72 @@
 local ln = require "ln"
 
 describe("ln", function()
-           describe("exports", function()
-                      it("has Logger", function()
-                           assert.truthy(ln.Logger)
-                      end)
+  describe("exports", function()
+    it("has Logger", function()
+      assert.truthy(ln.Logger)
+    end)
 
-                      it("has default_logger", function()
-                           assert.truthy(ln.default_logger)
-                      end)
+    it("has default_logger", function()
+      assert.truthy(ln.default_logger)
+    end)
 
-                      it("has LogfmtFormatter", function()
-                           assert.truthy(ln.LogfmtFormatter)
-                      end)
+    it("has LogfmtFormatter", function()
+      assert.truthy(ln.LogfmtFormatter)
+    end)
 
-                      it("has JSONFormatter", function()
-                           assert.truthy(ln.JSONFormatter)
-                      end)
+    it("has JSONFormatter", function()
+      assert.truthy(ln.JSONFormatter)
+    end)
 
-                      it("has log", function()
-                           assert.truthy(ln.log)
-                      end)
+    it("has log", function()
+      assert.truthy(ln.log)
+    end)
 
-                      it("has err", function()
-                           assert.truthy(ln.err)
-                      end)
-           end)
+    it("has err", function()
+      assert.truthy(ln.err)
+    end)
+  end)
 
-           describe("default logger operations", function()
-                      local lgr = ln.default_logger
-                      it("can log", function()
-                           lgr:log {foo = "bar"}
-                      end)
+  describe("default logger operations", function()
+    local lgr = ln.default_logger
+    it("can log", function()
+      lgr:log {foo = "bar"}
+    end)
 
-                      it("can error", function()
-                           lgr:err("vibe check failed", {foo = "bar"})
-                      end)
+    it("can error", function()
+      lgr:err("vibe check failed", {foo = "bar"})
+    end)
 
-                      it("takes multiple tables", function()
-                           lgr:log({foo = "bar"}, {baz = "boz"})
-                      end)
+    it("takes multiple tables", function()
+      lgr:log({foo = "bar"}, {baz = "boz"})
+    end)
 
-                      it("lets you override the formatter", function()
-                           lgr.formatter = ln.JSONFormatter:new()
-                           lgr:log {foo = "bar"}
-                      end)
-           end)
+    it("lets you override the formatter", function()
+      lgr.formatter = ln.JSONFormatter:new()
+      lgr:log {foo = "bar"}
+    end)
+  end)
 
-           describe("logfmt", function()
-                      local fmtr = ln.LogfmtFormatter:new()
+  describe("logfmt", function()
+    local fmtr = ln.LogfmtFormatter:new()
 
-                      it("should return a non-nil message", function()
-                           assert.truthy(fmtr:format({foo = "bar"}))
-                      end)
+    it("should return a non-nil message", function()
+     assert.truthy(fmtr:format({foo = "bar"}))
+    end)
 
-                      it("should have spaces when the input does", function()
-                           local msg = fmtr:format {foo = "bar with spaces"}
-                           assert.truthy(string.find(msg, 'foo="bar with spaces"'))
-                      end)
-           end)
+    it("should have spaces when the input does", function()
+      local msg = fmtr:format {foo = "bar with spaces"}
+      assert.truthy(string.find(msg, 'foo="bar with spaces"'))
+    end)
+  end)
+           
+  describe("logger options", function()
+    local lgr = ln.Logger:new {
+      formatter = ln.LogfmtFormatter:new()
+    }
+    
+    it("sets the formatter to non-nil", function()
+      assert.truthy(lgr.formatter)
+    end)
+  end)
 end)

src/ln.lua

@@ -68,13 +68,12 @@ function Logger:log(...)
   print(message)
 end
 
-function Logger:new(formatter)
-  if formatter == nil then
-    formatter = LogfmtFormatter:new()
+function Logger:new(o)
+  if o == nil then
+    o = {
+      formatter = LogfmtFormatter:new()
+    }
   end
-  local o = {
-    formatter = formatter,
-  }
   setmetatable(o, self)
   self.__index = self
   return o