First commit

backend/.gitignore

@@ -0,0 +1,2 @@
+alba
+*~

backend/data/screen.tpl.md

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+# Buongiorno Aldo!
+
+Oggi è il {{date}}. Il tempo a Trieste è **soleggiato**.
+
+# Prossimo bus per il centro
+
+* Linea 1 fermata Campo San Giacomo tra 10 minuti.
+* Linea 10 fermata Campo San Giacomo tra 3 minuti.
+
+# Cose da fare oggi
+
+1. Prenotare visita dentistica
+2. Fare la spesa
+3. Ritirare la pensione
+

backend/go.mod

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+module git.andreafazzi.eu/alba
+
+go 1.17
+
+require gogs.carduccidante.edu.it/karmen/core v0.0.0-20211206085206-72cea5882245

backend/go.sum

@@ -0,0 +1,57 @@
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backend/main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"text/template"
+	"time"
+
+	"gogs.carduccidante.edu.it/karmen/core/util/pandoc"
+	tplutil "gogs.carduccidante.edu.it/karmen/core/util/template"
+)
+
+var funcmap = template.FuncMap{
+	"date": func() string {
+		now := time.Now()
+
+		return now.Format("2006-02-01")
+	},
+}
+
+func convertPDFToPNG(filename string) error {
+	out, err := exec.Command("pandoc", pandoc_args...).CombinedOutput()
+	if string(out) != "" {
+		return fmt.Errorf("pandoc: %s", string(out))
+	}
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func serveScreen(res http.ResponseWriter, req *http.Request) {
+	tpl, err := tplutil.LoadTextTemplate("screen.tpl.md", funcmap)
+	if err != nil {
+		panic(err)
+	}
+
+	f, err := os.Create("./data/screen.md")
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	log.Println("Generating markdown file from template.")
+	if err := tpl.Execute(f, nil); err != nil {
+		panic(err)
+	}
+
+	log.Println("Converting markdown to pdf.")
+	err = pandoc.Convert("./data/screen.md", "./data/screen.pdf", "-V", "geometry:papersize={3.8in,6.4in}", "-V", "pagestyle:empty")
+	if err != nil {
+		panic(err)
+	}
+
+	log.Println("Serving screen.png...")
+	http.ServeFile(res, req, "./data/screen.png")
+}
+
+func main() {
+	http.HandleFunc("/", serveScreen)
+
+	log.Println("Start alba backend...")
+	http.ListenAndServe(":8080", nil)
+}