138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package main
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import (
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"bufio"
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"bytes"
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"fmt"
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"image"
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"image/color"
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"image/color/palette"
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"image/draw"
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"image/gif"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/ericaro/frontmatter"
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"github.com/fogleman/gg"
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)
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type Post struct {
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Title string `yaml:"title"`
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Tags []string `yaml:"tags"`
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}
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func main() {
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if err := filepath.Walk("./content/posts/", func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if info.IsDir() {
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return nil
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}
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body, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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var out Post
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frontmatter.Unmarshal(body, &out)
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img, err := run(out.Title)
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if err != nil {
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return err
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}
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filename := "./static/images/" + strings.ReplaceAll(info.Name(), ".md", ".gif")
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fmt.Printf("Saving %s", filename)
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ioutil.WriteFile(filename, img, 0755)
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return nil
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}); err != nil {
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panic(err)
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}
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}
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const (
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width = 1200
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height = 628
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)
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var (
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monoFont = filepath.Join("/fonts", "Noto.ttf")
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headerFont = filepath.Join("/fonts", "Inter-SemiBold.ttf")
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fontColor = color.RGBA{169, 169, 179, 0xff}
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)
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func run(title string) ([]byte, error) {
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dc := gg.NewContext(width, height)
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// Background
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dc.SetHexColor("#292a2d")
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dc.DrawRectangle(0, 0, width, height)
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dc.Fill()
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// Header
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dc.SetHexColor("#252627")
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dc.DrawRectangle(0, 0, width, 100)
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dc.Fill()
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if err := dc.LoadFontFace(monoFont, 45); err != nil {
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return nil, err
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}
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dc.SetColor(fontColor)
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dc.DrawString("#til", 45, 60)
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dc.LoadFontFace(monoFont, 20)
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dc.SetColor(fontColor)
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dc.DrawString("https://til.marcusnoble.co.uk", 895, 623)
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dc.LoadFontFace(headerFont, 80)
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textRightMargin := 50.0
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textTopMargin := 130.0
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x := textRightMargin
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y := textTopMargin
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maxWidth := float64(dc.Width()) - textRightMargin - textRightMargin
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dc.SetColor(color.White)
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dc.DrawStringWrapped(title, x+1, y+1, 0, 0, maxWidth, 1.5, gg.AlignLeft)
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dc.SetColor(fontColor)
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dc.DrawStringWrapped(title, x, y, 0, 0, maxWidth, 1.5, gg.AlignLeft)
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frame1 := dc.Image()
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dc = gg.NewContextForImage(frame1)
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dc.LoadFontFace(headerFont, 80)
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title += " |"
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textRightMargin = 50.0
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textTopMargin = 130.0
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x = textRightMargin
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y = textTopMargin
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maxWidth = float64(dc.Width()) - textRightMargin - textRightMargin
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dc.SetColor(color.White)
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dc.DrawStringWrapped(title, x+1, y+1, 0, 0, maxWidth, 1.5, gg.AlignLeft)
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dc.SetColor(fontColor)
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dc.DrawStringWrapped(title, x, y, 0, 0, maxWidth, 1.5, gg.AlignLeft)
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frame2 := dc.Image()
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palettedImage1 := image.NewPaletted(frame1.Bounds(), palette.Plan9)
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draw.Over.Draw(palettedImage1, frame1.Bounds(), frame1, image.ZP)
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palettedImage2 := image.NewPaletted(frame2.Bounds(), palette.Plan9)
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draw.Over.Draw(palettedImage2, frame2.Bounds(), frame2, image.ZP)
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var output bytes.Buffer
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gif.EncodeAll(bufio.NewWriter(&output), &gif.GIF{
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Image: []*image.Paletted{
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palettedImage1,
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palettedImage2,
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},
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Delay: []int{50, 50},
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})
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return output.Bytes(), nil
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}
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