♻️ Use defined errors

models/entry.go

@@ -29,12 +29,12 @@ func (e Entry) getFieldMarshalChan() chan metaRes {
 	// @todo figure out a way to handle json field
 	for i := 0; i < size; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func(m Meta) {
 			defer wg.Done()
-			o, er := e.Fields[i].MarshalText()
+			o, er := m.MarshalText()
 			ch <- metaRes{o, er}
 
-		}(i)
+		}(e.Fields[i])
 	}
 
 	go func() {
@@ -47,10 +47,10 @@ func (e Entry) getFieldMarshalChan() chan metaRes {
 func (e Entry) MarshalText() ([]byte, error) {
 	e.Title = strings.TrimSpace(e.Title)
 	if e.Title == "" {
-		return []byte{}, errors.New("Empty title")
+		return []byte{}, ErrorMissingTitle
 	}
 	if e.Date == (time.Time{}) {
-		return []byte{}, errors.New("Empty date")
+		return []byte{}, ErrorMissingDate
 	}
 	ch := e.getFieldMarshalChan()
 	buff := &bytes.Buffer{}

models/entry_test.go

@@ -28,8 +28,8 @@ func TestEntryMarshal(t *testing.T) {
 		lines  []string
 		err    error
 	}{
-		{"no-title", "", when, simple, "", nolines, errors.New("Empty title")},
-		{"zero-date", "Empty title", time.Time{}, simple, "", nolines, errors.New("Empty date")},
+		{"no-title", "", when, simple, "", nolines, ErrorMissingTitle},
+		{"zero-date", "Empty title", time.Time{}, simple, "", nolines, ErrorMissingDate},
 		{"one-line", "A Title", when, simple, "@begin " + whens + " - A Title @end", nolines, nil},
 		{
 			"one-field",
@@ -102,8 +102,8 @@ func TestEntryUnmarshal(t *testing.T) {
 	}{
 		{"one-line", "@begin " + whens + " - A Title @end", "A Title", when, simple, nil},
 		{"multi-title", "@begin " + whens + " - A Title\nwith break @end", "A Title\nwith break", when, simple, nil},
-		{"no-title", "@begin " + whens + " - @end", "", when, simple, errors.New("Missing title")},
-		{"no-date", "@begin  - A Title @end", "A Title", when, simple, errors.New("Missing date")},
+		{"no-title", "@begin " + whens + " -   @end", "", when, simple, errors.New("Missing title")},
+		{"no-date", "@begin   - A Title @end", "A Title", when, simple, errors.New("Missing date")},
 		{"one-field", "@begin " + whens + " - A Title\n@age 41 @end", "A Title", when, []Meta{{"age", 41}}, nil},
 		{
 			"two-fields",

models/errors.go

@@ -0,0 +1,14 @@
+package models
+
+import (
+	"errors"
+	"fmt"
+)
+
+var ErrorMissingTitle = errors.New("Missing title")
+var ErrorMissingDate = errors.New("Missing date")
+var ErrorParsing = errors.New("Parsing Error")
+
+func newParsingError(err error) error {
+	return fmt.Errorf("%w: %w", ErrorParsing, err)
+}

models/meta.go

@@ -56,12 +56,12 @@ func (m Meta) MarshalText() ([]byte, error) {
 
 func (m *Meta) UnmarshalText(in []byte) error {
 	if len(in) == 0 {
-		return errors.New("Unable to Unmarshal empty string")
+		return newParsingError(errors.New("Unable to Unmarshal empty string"))
 	}
 	re := regexp.MustCompile("(?s)^@([^ ]+) (.*)( @end)?$")
 	match := re.FindSubmatch(in)
 	if len(match) == 0 {
-		return fmt.Errorf("Failed to match %s", in)
+		return newParsingError(fmt.Errorf("Failed to match %s", in))
 	}
 	m.Key = string(match[1])
 	return m.processMeta(match[2])
@@ -69,11 +69,11 @@ func (m *Meta) UnmarshalText(in []byte) error {
 
 func (m *Meta) processMeta(in []byte) error {
 	if len(in) == 0 {
-		return errors.New("No value found")
+		return newParsingError(errors.New("No value found"))
 	}
 	s := strings.TrimSpace(string(in))
 	if len(s) == 0 {
-		return errors.New("No value found")
+		return newParsingError(errors.New("No value found"))
 	}
 	yesno := regexp.MustCompile("^(y|Y|yes|Yes|YES|n|N|no|No|NO|true|True|TRUE|false|False|FALSE|on|On|ON|off|Off|OFF)$")
 	yes := regexp.MustCompile("^(y|Y|yes|Yes|YES|true|True|TRUE|on|On|ON)$")

models/meta_test.go

@@ -32,7 +32,7 @@ func TestMeta(t *testing.T) {
 		{"json number", "num", json.Number("42.13"), "@num 42.13", nil, 42.13},
 		{"true", "b", true, "@b true", nil, true},
 		{"false", "b", false, "@b false", nil, false},
-		{"nil", "n", nil, "", nil, errors.New("Unable to Unmarshal empty string")},
+		{"nil", "n", nil, "", nil, ErrorParsing},
 		{"time", "when", when, "@when " + when.Format(time.RFC3339), nil, when},
 		{"rune", "char", '@', "@char @", nil, "@"},
 		{"bytes", "byteme", []byte("yo"), "@byteme yo", nil, "yo"},
@@ -41,11 +41,11 @@ func TestMeta(t *testing.T) {
 		{"json-arr", "arr", json.RawMessage(`["foo",42,"bar", null,"quux", true]`), `@arr ["foo",42,"bar", null,"quux", true]`, nil, json.RawMessage(`["foo",42,"bar", null,"quux", true]`)},
 		{"chan", "nope", make(chan bool), "", errors.New("Unknown type chan bool"), ""},
 		{"whitespace-key", "no space", "hi", "", errors.New("whitespace is not allowed in key: no space"), ""},
-		{"empty-mar", "nope", skipMarshalTest, "", nil, errors.New("Unable to Unmarshal empty string")},
-		{"no-key-mar", "nope", skipMarshalTest, "nope", nil, errors.New("Failed to match nope")},
-		{"no-value-mar", "nope", skipMarshalTest, "@nope ", nil, errors.New("No value found")},
-		{"space-value-mar", "nope", skipMarshalTest, "@nope  ", nil, errors.New("No value found")},
-		{"space-value-mar", "nope", skipMarshalTest, "@nope  \n  ", nil, errors.New("No value found")},
+		{"empty-mar", "nope", skipMarshalTest, "", nil, ErrorParsing},
+		{"no-key-mar", "nope", skipMarshalTest, "nope", nil, ErrorParsing},
+		{"no-value-mar", "nope", skipMarshalTest, "@nope ", nil, ErrorParsing},
+		{"space-value-mar", "nope", skipMarshalTest, "@nope  ", nil, ErrorParsing},
+		{"space-nl-value-mar", "nope", skipMarshalTest, "@nope  \n  ", nil, ErrorParsing},
 		{"null-value-mar", "nope", skipMarshalTest, "@nope null", nil, nil},
 		{"tilda-value-mar", "nope", skipMarshalTest, "@nope ~", nil, nil},
 		{"none-value-mar", "nope", skipMarshalTest, "@nope none", nil, nil},
@@ -81,7 +81,7 @@ func getMetaTestRunner(key string, value any, out string, err error, newVal any)
 			e = n.UnmarshalText([]byte(out))
 		}
 		if newE, ok := newVal.(error); ok {
-			assert.Equal(t, newE, e)
+			assert.ErrorIs(t, e, newE)
 		} else {
 			assert.Equal(t, key, n.Key)
 			if ti, ok := newVal.(time.Time); ok {