package pptx
import (
"archive/zip"
"bytes"
_ "embed"
"fmt"
"strings"
"time"
)
// Office Open XML (OOXML) http://officeopenxml.com/prPresentation.php
//go:embed template.pptx
var pptx_template []byte
func copyPptxTemplateTo(w *zip.Writer) error {
reader := bytes.NewReader(pptx_template)
zipReader, err := zip.NewReader(reader, reader.Size())
if err != nil {
fmt.Printf("error creating zip reader: %v", err)
}
for _, f := range zipReader.File {
if err := w.Copy(f); err != nil {
return fmt.Errorf("error copying %s: %v", f.Name, err)
}
}
return nil
}
func addFile(zipFile *zip.Writer, filePath, content string) error {
w, err := zipFile.Create(filePath)
if err != nil {
return err
}
w.Write([]byte(content))
return nil
}
// https://startbigthinksmall.wordpress.com/2010/01/04/points-inches-and-emus-measuring-units-in-office-open-xml/
const SLIDE_WIDTH = 9_144_000
const SLIDE_HEIGHT = 5_143_500
const HEADER_HEIGHT = 392_471
const IMAGE_HEIGHT = SLIDE_HEIGHT - HEADER_HEIGHT
// keep the right aspect ratio: SLIDE_WIDTH / SLIDE_HEIGHT = IMAGE_WIDTH / IMAGE_HEIGHT
const IMAGE_WIDTH = 8_446_273
const IMAGE_ASPECT_RATIO = float64(IMAGE_WIDTH) / float64(IMAGE_HEIGHT)
func getRelsSlideXml(slide *Slide) string {
var builder strings.Builder
builder.WriteString(``)
builder.WriteString(
fmt.Sprintf(
``,
slide.ImageId,
slide.ImageId,
),
)
for _, link := range slide.Links {
if link.isExternal() {
builder.WriteString(
fmt.Sprintf(
``,
link.Id,
link.ExternalUrl,
),
)
} else {
builder.WriteString(
fmt.Sprintf(
``,
link.Id,
link.SlideIndex,
),
)
}
}
builder.WriteString(``)
return builder.String()
}
func getSlideXml(slide *Slide) string {
var builder strings.Builder
builder.WriteString(``)
slideDescription := strings.Join(slide.BoardPath, " / ")
builder.WriteString(fmt.Sprintf(``, slideDescription, slideDescription))
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(``, slide.ImageId))
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(``, slide.ImageLeft, slide.ImageTop))
builder.WriteString(fmt.Sprintf(``, slide.ImageWidth, slide.ImageHeight))
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(``, slideDescription))
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(``, HEADER_HEIGHT))
builder.WriteString(``)
boardName := slide.BoardPath[len(slide.BoardPath)-1]
prefixPath := slide.BoardPath[:len(slide.BoardPath)-1]
if len(prefixPath) > 0 {
prefix := strings.Join(prefixPath, " / ") + " / "
builder.WriteString(fmt.Sprintf(`%s%s`, prefix, boardName))
} else {
builder.WriteString(fmt.Sprintf(`%s`, boardName))
}
for _, link := range slide.Links {
builder.WriteString(getLinkXml(link))
}
builder.WriteString(``)
return builder.String()
}
func getPresentationXmlRels(slideFileNames []string) string {
var builder strings.Builder
builder.WriteString(``)
for _, name := range slideFileNames {
builder.WriteString(fmt.Sprintf(
``, name, name,
))
}
builder.WriteString("")
return builder.String()
}
func getContentTypesXml(slideFileNames []string) string {
var builder strings.Builder
builder.WriteString(``)
for _, name := range slideFileNames {
builder.WriteString(fmt.Sprintf(
``, name,
))
}
builder.WriteString(``)
return builder.String()
}
func getPresentationXml(slideFileNames []string) string {
var builder strings.Builder
builder.WriteString(``)
builder.WriteString("")
for i, name := range slideFileNames {
// in the exported presentation, the first slide ID was 256, so keeping it here for compatibility
builder.WriteString(fmt.Sprintf(``, 256+i, name))
}
builder.WriteString("")
builder.WriteString(fmt.Sprintf(
``,
SLIDE_WIDTH,
SLIDE_HEIGHT,
))
return builder.String()
}
func getCoreXml(title, subject, description, creator string) string {
var builder strings.Builder
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(`%s`, title))
builder.WriteString(fmt.Sprintf(`%s`, subject))
builder.WriteString(fmt.Sprintf(`%s`, creator))
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(`%s`, description))
builder.WriteString(fmt.Sprintf(`%s`, creator))
builder.WriteString(`1`)
dateTime := time.Now().Format(time.RFC3339)
builder.WriteString(fmt.Sprintf(`%s`, dateTime))
builder.WriteString(fmt.Sprintf(`%s`, dateTime))
builder.WriteString(``)
builder.WriteString(``)
return builder.String()
}
func getAppXml(slides []*Slide, d2version string) string {
var builder strings.Builder
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`1`)
builder.WriteString(`0`)
builder.WriteString(`D2`)
builder.WriteString(`On-screen Show (4:3)`)
builder.WriteString(`0`)
builder.WriteString(fmt.Sprintf(`%d`, len(slides)))
builder.WriteString(`0`)
builder.WriteString(`0`)
builder.WriteString(`0`)
builder.WriteString(`false`)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`Fonts`)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`2`)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`Theme`)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`1`)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`Slide Titles`)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(fmt.Sprintf(`%d`, len(slides)))
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(``)
// number of entries, len(slides) + Office Theme + 2 Fonts
builder.WriteString(fmt.Sprintf(``, len(slides)+3))
builder.WriteString(`Arial`)
builder.WriteString(`Calibri`)
builder.WriteString(`Office Theme`)
for _, slide := range slides {
builder.WriteString(fmt.Sprintf(`%s`, strings.Join(slide.BoardPath, "/")))
}
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(``)
builder.WriteString(`false`)
builder.WriteString(`false`)
builder.WriteString(``)
builder.WriteString(`false`)
builder.WriteString(fmt.Sprintf(`%s`, d2version))
builder.WriteString(``)
return builder.String()
}
//go:embed xmlTemplates/link.xml
var linkTemplate string
func getLinkXml(link *Link) string {
var linkAction string
if !link.isExternal() {
linkAction = "ppaction://hlinksldjump"
}
return fmt.Sprintf(
linkTemplate,
link.Index,
link.Tooltip,
link.Id,
linkAction,
link.Tooltip,
link.Left,
link.Top,
link.Width,
link.Height,
)
}