125 lines
2.6 KiB
Go
125 lines
2.6 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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"day": func() int {
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_, _, day := time.Now().Date()
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return day
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},
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"month": func() int {
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_, month, _ := time.Now().Date()
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return int(month)
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},
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"year": func() int {
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year, _, _ := time.Now().Date()
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return year
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},
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"news": func() []*gofeed.Item {
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result := make([]*gofeed.Item, 0)
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fp := gofeed.NewParser()
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feed, _ := fp.ParseURL("https://www.agi.it/innovazione/rss")
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for _, it := range feed.Items {
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result = append(result, it)
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}
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return result[:2]
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},
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"weather": func() []*gofeed.Item {
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result := make([]*gofeed.Item, 0)
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fp := gofeed.NewParser()
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feed, _ := fp.ParseURL("https://www.meteowebcam.eu/rss.xml")
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for _, it := range feed.Items {
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result = append(result, it)
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}
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return result[:1]
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},
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}
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func convertPDFToBMP(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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out, err = exec.Command("convert", "./data/screen-1.png",
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"-rotate", "-90",
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"-resize", "800x480!",
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"-dither", "none",
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"-remap", "./data/palette.gif",
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"BMP3:./data/screen.bmp",
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).CombinedOutput()
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if string(out) != "" {
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return fmt.Errorf("covert: %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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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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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,6in}", "-V", "pagestyle:empty")
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err = pandoc.Convert("./data/screen.md", "./data/screen.pdf", "-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 monochrome BMP.")
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err = convertPDFToBMP("./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.bmp")
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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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