Add support for empty unquoted values

Author: mwoods79

ROADMAP.md

@@ -105,12 +105,20 @@ Envious.parse("KEY=value\nINVALID")
 ## Medium Priority
 
 ### 6. Support for Empty Values
-**Status:** Pending
-**File:** `lib/envious/parser.ex`
+**Status:** ✅ Complete
+**File:** `lib/envious/parser.ex:154-157`
 
 Allow variables to be set to empty strings: `KEY=`
 
-**Note:** This overlaps with item #1 but deserves explicit testing and handling.
+**Completed:** Updated unquoted value parser to accept 0 or more characters (changed `min: 1` to `min: 0`). Empty values now parse to empty strings, consistent with quoted empty values.
+
+**Changes made:**
+- Changed `unquoted_value` parser to allow `min: 0` characters
+- Added 2 test cases for empty unquoted values
+- All three empty value syntaxes now work:
+  - `KEY=""` → `%{"KEY" => ""}`
+  - `KEY=''` → `%{"KEY" => ""}`
+  - `KEY=` → `%{"KEY" => ""}`
 
 ### 7. Variable Expansion
 **Status:** Pending

lib/envious/parser.ex

@@ -148,11 +148,11 @@ defmodule Envious.Parser do
     ])
 
   # Unquoted value: traditional unquoted values
-  # - Collect 1 or more value characters
+  # - Collect 0 or more value characters (allows empty values like KEY=)
   # - Convert the character list to a string
   # - Trim whitespace from both ends (handles inline comments: "value # comment")
   unquoted_value =
-    times(unquoted_value_char, min: 1)
+    times(unquoted_value_char, min: 0)
     |> reduce({List, :to_string, []})
     |> post_traverse(:trim_value)
 

test/envious_test.exs

@@ -90,6 +90,16 @@ defmodule EnviousTest do
              {:ok, %{"EMPTY" => ""}}
   end
 
+  test "empty unquoted value" do
+    assert Envious.parse("EMPTY=") ==
+             {:ok, %{"EMPTY" => ""}}
+  end
+
+  test "empty unquoted value with newline" do
+    assert Envious.parse("EMPTY=\nKEY=value") ==
+             {:ok, %{"EMPTY" => "", "KEY" => "value"}}
+  end
+
   # Error handling tests
   test "unclosed double quote returns error" do
     assert {:error, message} = Envious.parse("KEY=\"unclosed")