Issue 97: Support for Alternative Representations

calendar.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"net/http"
 	"reflect"
+	"strings"
 	"time"
 )
 
@@ -169,6 +170,10 @@ func (cp ComponentProperty) Multiple(c Component) bool {
 	return false
 }
 
+func ComponentPropertyExtended(s string) ComponentProperty {
+	return ComponentProperty("X-" + strings.TrimPrefix("X-", s))
+}
+
 type Property string
 
 const (
@@ -232,6 +237,14 @@ const (
 
 type Parameter string
 
+func (p Parameter) IsQuoted() bool {
+	switch p {
+	case ParameterAltrep:
+		return true
+	}
+	return false
+}
+
 const (
 	ParameterAltrep              Parameter = "ALTREP"
 	ParameterCn                  Parameter = "CN"
@@ -404,25 +417,72 @@ func NewCalendarFor(service string) *Calendar {
 	return c
 }
 
-func (cal *Calendar) Serialize() string {
+func (cal *Calendar) Serialize(ops ...any) string {
 	b := bytes.NewBufferString("")
 	// We are intentionally ignoring the return value. _ used to communicate this to lint.
-	_ = cal.SerializeTo(b)
+	_ = cal.SerializeTo(b, ops...)
 	return b.String()
 }
 
-func (cal *Calendar) SerializeTo(w io.Writer) error {
-	_, _ = fmt.Fprint(w, "BEGIN:VCALENDAR", "\r\n")
+type WithLineLength int
+type WithNewLine string
+
+func (cal *Calendar) SerializeTo(w io.Writer, ops ...any) error {
+	serializeConfig, err := parseSerializeOps(ops)
+	if err != nil {
+		return err
+	}
+	_, _ = fmt.Fprint(w, "BEGIN:VCALENDAR", serializeConfig.NewLine)
 	for _, p := range cal.CalendarProperties {
-		p.serialize(w)
+		err := p.serialize(w, serializeConfig)
+		if err != nil {
+			return err
+		}
 	}
 	for _, c := range cal.Components {
-		c.SerializeTo(w)
+		err := c.SerializeTo(w, serializeConfig)
+		if err != nil {
+			return err
+		}
 	}
-	_, _ = fmt.Fprint(w, "END:VCALENDAR", "\r\n")
+	_, _ = fmt.Fprint(w, "END:VCALENDAR", serializeConfig.NewLine)
 	return nil
 }
 
+type SerializationConfiguration struct {
+	MaxLength         int
+	NewLine           string
+	PropertyMaxLength int
+}
+
+func parseSerializeOps(ops []any) (*SerializationConfiguration, error) {
+	serializeConfig := defaultSerializationOptions()
+	for opi, op := range ops {
+		switch op := op.(type) {
+		case WithLineLength:
+			serializeConfig.MaxLength = int(op)
+		case WithNewLine:
+			serializeConfig.NewLine = string(op)
+		case *SerializationConfiguration:
+			return op, nil
+		case error:
+			return nil, op
+		default:
+			return nil, fmt.Errorf("unknown op %d of type %s", opi, reflect.TypeOf(op))
+		}
+	}
+	return serializeConfig, nil
+}
+
+func defaultSerializationOptions() *SerializationConfiguration {
+	serializeConfig := &SerializationConfiguration{
+		MaxLength:         75,
+		PropertyMaxLength: 75,
+		NewLine:           string(NewLine),
+	}
+	return serializeConfig
+}
+
 func (cal *Calendar) SetMethod(method Method, params ...PropertyParameter) {
 	cal.setProperty(PropertyMethod, string(method), params...)
 }

calendar_serialization_test.go

@@ -31,15 +31,16 @@ func TestCalendar_ReSerialization(t *testing.T) {
 	}
 
 	for _, filename := range testFileNames {
-		t.Run(fmt.Sprintf("compare serialized -> deserialized -> serialized: %s", filename), func(t *testing.T) {
+		fp := filepath.Join(testDir, filename)
+		t.Run(fmt.Sprintf("compare serialized -> deserialized -> serialized: %s", fp), func(t *testing.T) {
 			//given
-			originalSeriailizedCal, err := os.ReadFile(filepath.Join(testDir, filename))
+			originalSeriailizedCal, err := os.ReadFile(fp)
 			require.NoError(t, err)
 
 			//when
 			deserializedCal, err := ParseCalendar(bytes.NewReader(originalSeriailizedCal))
 			require.NoError(t, err)
-			serializedCal := deserializedCal.Serialize()
+			serializedCal := deserializedCal.Serialize(WithNewLineWindows)
 
 			//then
 			expectedCal, err := os.ReadFile(filepath.Join(expectedDir, filename))

calendar_test.go

@@ -2,10 +2,12 @@ package ics
 
 import (
 	"bytes"
+	"embed"
 	_ "embed"
+	"github.com/google/go-cmp/cmp"
 	"io"
+	"io/fs"
 	"net/http"
-	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -16,8 +18,13 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+var (
+	//go:embed testdata/*
+	TestData embed.FS
+)
+
 func TestTimeParsing(t *testing.T) {
-	calFile, err := os.OpenFile("./testdata/timeparsing.ics", os.O_RDONLY, 0400)
+	calFile, err := TestData.Open("testdata/timeparsing.ics")
 	if err != nil {
 		t.Errorf("read file: %v", err)
 	}
@@ -165,12 +172,15 @@ CLASS:PUBLIC
 func TestRfc5545Sec4Examples(t *testing.T) {
 	rnReplace := regexp.MustCompile("\r?\n")
 
-	err := filepath.Walk("./testdata/rfc5545sec4/", func(path string, info os.FileInfo, _ error) error {
+	err := fs.WalkDir(TestData, "testdata/rfc5545sec4", func(path string, info fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
 		if info.IsDir() {
 			return nil
 		}
 
-		inputBytes, err := os.ReadFile(path)
+		inputBytes, err := fs.ReadFile(TestData, path)
 		if err != nil {
 			return err
 		}
@@ -389,13 +399,13 @@ END:VCALENDAR
 }
 
 func TestIssue52(t *testing.T) {
-	err := filepath.Walk("./testdata/issue52/", func(path string, info os.FileInfo, _ error) error {
+	err := fs.WalkDir(TestData, "testdata/issue52", func(path string, info fs.DirEntry, _ error) error {
 		if info.IsDir() {
 			return nil
 		}
 		_, fn := filepath.Split(path)
 		t.Run(fn, func(t *testing.T) {
-			f, err := os.Open(path)
+			f, err := TestData.Open(path)
 			if err != nil {
 				t.Fatalf("Error reading file: %s", err)
 			}
@@ -414,6 +424,46 @@ func TestIssue52(t *testing.T) {
 	}
 }
 
+func TestIssue97(t *testing.T) {
+	err := fs.WalkDir(TestData, "testdata/issue97", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
+		if !strings.HasSuffix(d.Name(), ".ics") && !strings.HasSuffix(d.Name(), ".ics_disabled") {
+			return nil
+		}
+		t.Run(path, func(t *testing.T) {
+			if strings.HasSuffix(d.Name(), ".ics_disabled") {
+				t.Skipf("Test disabled")
+			}
+			b, err := TestData.ReadFile(path)
+			if err != nil {
+				t.Fatalf("Error reading file: %s", err)
+			}
+			ics, err := ParseCalendar(bytes.NewReader(b))
+			if err != nil {
+				t.Fatalf("Error parsing file: %s", err)
+			}
+
+			got := ics.Serialize(WithLineLength(74))
+			if diff := cmp.Diff(string(b), got, cmp.Transformer("ToUnixText", func(a string) string {
+				return strings.ReplaceAll(a, "\r\n", "\n")
+			})); diff != "" {
+				t.Errorf("ParseCalendar() mismatch (-want +got):\n%s", diff)
+				t.Errorf("Complete got:\b%s", got)
+			}
+		})
+		return nil
+	})
+
+	if err != nil {
+		t.Fatalf("cannot read test directory: %v", err)
+	}
+}
+
 type MockHttpClient struct {
 	Response *http.Response
 	Error    error

cmd/issues/test97_1/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	ics "github.com/arran4/golang-ical"
+	"net/url"
+)
+
+func main() {
+	i := ics.NewCalendarFor("Mozilla.org/NONSGML Mozilla Calendar V1.1")
+	tz := i.AddTimezone("Europe/Berlin")
+	tz.AddProperty(ics.ComponentPropertyExtended("TZINFO"), "Europe/Berlin[2024a]")
+	tzstd := tz.AddStandard()
+	tzstd.AddProperty(ics.ComponentProperty(ics.PropertyTzoffsetto), "+010000")
+	tzstd.AddProperty(ics.ComponentProperty(ics.PropertyTzoffsetfrom), "+005328")
+	tzstd.AddProperty(ics.ComponentProperty(ics.PropertyTzname), "Europe/Berlin(STD)")
+	tzstd.AddProperty(ics.ComponentProperty(ics.PropertyDtstart), "18930401T000000")
+	tzstd.AddProperty(ics.ComponentProperty(ics.PropertyRdate), "18930401T000000")
+	vEvent := i.AddEvent("d23cef0d-9e58-43c4-9391-5ad8483ca346")
+	vEvent.AddProperty(ics.ComponentPropertyCreated, "20240929T120640Z")
+	vEvent.AddProperty(ics.ComponentPropertyLastModified, "20240929T120731Z")
+	vEvent.AddProperty(ics.ComponentPropertyDtstamp, "20240929T120731Z")
+	vEvent.AddProperty(ics.ComponentPropertySummary, "Test Event")
+	vEvent.AddProperty(ics.ComponentPropertyDtStart, "20240929T144500", ics.WithTZID("Europe/Berlin"))
+	vEvent.AddProperty(ics.ComponentPropertyDtEnd, "20240929T154500", ics.WithTZID("Europe/Berlin"))
+	vEvent.AddProperty(ics.ComponentPropertyTransp, "OPAQUE")
+	vEvent.AddProperty(ics.ComponentPropertyLocation, "Github")
+	uri := &url.URL{
+		Scheme: "data",
+		Opaque: "text/html,I%20want%20a%20custom%20linkout%20for%20Thunderbird.%3Cbr%3EThis%20is%20the%20Github%20%3Ca%20href%3D%22https%3A%2F%2Fgit.luolix.top%2Farran4%2Fgolang-ical%2Fissues%2F97%22%3EIssue%3C%2Fa%3E.",
+	}
+	vEvent.AddProperty(ics.ComponentPropertyDescription, "I want a custom linkout for Thunderbird.\nThis is the Github Issue.", ics.WithAlternativeRepresentation(uri))
+	fmt.Println(i.Serialize())
+}