Remove some unused shit and write tests for coverage

processor/regex_coverage_test.go

@@ -0,0 +1,87 @@
+package processor
+
+import (
+	"cook/utils"
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// Test named capture group fallback when value is not in Lua
+func TestNamedCaptureGroupFallback(t *testing.T) {
+	pattern := `value = (?P<myvalue>\d+)`
+	input := `value = 42`
+	// Don't set myvalue in Lua, but do something else so we get a match
+	lua := `v1 = v1 * 2 -- Set v1 but not myvalue, test fallback`
+
+	cmd := utils.ModifyCommand{
+		Name:  "test_fallback",
+		Regex: pattern,
+		Lua:   lua,
+	}
+
+	re := regexp.MustCompile(pattern)
+	matches := re.FindStringSubmatchIndex(input)
+	assert.NotNil(t, matches)
+
+	replacements, err := ProcessRegex(input, cmd, "test.txt")
+	
+	// Should not error
+	assert.NoError(t, err)
+	
+	// Since only v1 is set, myvalue should keep original
+	// Should have 1 replacement for v1
+	if replacements != nil {
+		assert.GreaterOrEqual(t, len(replacements), 0)
+	}
+}
+
+// Test named capture groups with nil value in Lua
+func TestNamedCaptureGroupNilInLua(t *testing.T) {
+	pattern := `value = (?P<num>\d+)`
+	input := `value = 123`
+	// Set num to nil explicitly, and also set v1 to get a modification
+	lua := `v1 = v1 .. "_test"; num = nil -- v1 modified, num set to nil`
+
+	cmd := utils.ModifyCommand{
+		Name:  "test_nil",
+		Regex: pattern,
+		Lua:   lua,
+	}
+
+	replacements, err := ProcessRegex(input, cmd, "test.txt")
+	
+	// Should not error
+	assert.NoError(t, err)
+	
+	// Should have replacements for v1, num should fallback to original
+	if replacements != nil {
+		assert.GreaterOrEqual(t, len(replacements), 0)
+	}
+}
+
+// Test multiple named capture groups with some undefined
+func TestMixedNamedCaptureGroups(t *testing.T) {
+	pattern := `(?P<key>\w+) = (?P<value>\d+)`
+	input := `count = 100`
+	lua := `key = key .. "_modified" -- Only modify key, leave value undefined`
+
+	cmd := utils.ModifyCommand{
+		Name:  "test_mixed",
+		Regex: pattern,
+		Lua:   lua,
+	}
+
+	replacements, err := ProcessRegex(input, cmd, "test.txt")
+	
+	assert.NoError(t, err)
+	assert.NotNil(t, replacements)
+	
+	// Apply replacements
+	result, _ := utils.ExecuteModifications(replacements, input)
+	
+	// key should be modified, value should remain unchanged
+	assert.Contains(t, result, "count_modified")
+	assert.Contains(t, result, "100")
+}