85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"os/exec"
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"text/template"
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"time"
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"github.com/mmcdole/gofeed"
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"gogs.carduccidante.edu.it/karmen/core/util/pandoc"
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tplutil "gogs.carduccidante.edu.it/karmen/core/util/template"
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)
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var funcmap = template.FuncMap{
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"date": func() string {
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now := time.Now()
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return now.Format("2006-02-01")
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},
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}
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func convertPDFToPNG(filename string) error {
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out, err := exec.Command("pdftoppm", filename, "./data/screen", "-png").CombinedOutput()
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if string(out) != "" {
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return fmt.Errorf("pdftoppm: %s", string(out))
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}
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if err != nil {
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return err
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}
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return nil
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}
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func serveScreen(res http.ResponseWriter, req *http.Request) {
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fp := gofeed.NewParser()
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feed, _ := fp.ParseURL("https://www.agi.it/innovazione/rss")
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tpl, err := tplutil.LoadTextTemplate("./data/screen.tpl.md", funcmap)
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if err != nil {
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panic(err)
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}
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f, err := os.Create("./data/screen.md")
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if err != nil {
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panic(err)
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}
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defer f.Close()
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var data struct {
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Title string
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Item *gofeed.Item
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}
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data.Title = feed.Title
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data.Item = feed.Items[0]
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log.Println("Generating markdown file from template.")
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if err := tpl.Execute(f, data); err != nil {
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panic(err)
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}
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log.Println("Converting markdown to pdf.")
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err = pandoc.Convert("./data/screen.md", "./data/screen.pdf", "-V", "geometry:papersize={3.8in,6.4in}", "-V", "pagestyle:empty")
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if err != nil {
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panic(err)
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}
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log.Println("Converting pdf to png.")
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err = convertPDFToPNG("./data/screen.pdf")
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if err != nil {
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panic(err)
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}
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log.Println("Serving screen.png...")
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http.ServeFile(res, req, "./data/screen-1.png")
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}
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func main() {
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http.HandleFunc("/", serveScreen)
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log.Println("Start alba backend...")
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http.ListenAndServe(":3000", nil)
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}
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