text-to-dxf/main.go
2021-07-27 05:50:37 +01:00

105 lines
2.2 KiB
Go

package main
import (
"embed"
"fmt"
"math/rand"
"net/http"
"os"
"os/exec"
"strings"
"text/template"
"time"
"github.com/spf13/afero"
)
//go:embed index.html template.svg
var content embed.FS
var port = os.Getenv("PORT")
func init() {
rand.Seed(time.Now().UTC().UnixNano())
}
func main() {
if port == "" {
port = "8080"
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
text := r.URL.Query().Get("text")
font := r.URL.Query().Get("font")
if text == "" {
body, _ := content.ReadFile("index.html")
w.Write(body)
return
}
dxf, err := createDXF(text, font)
if err != nil {
fmt.Fprintf(w, err.Error())
return
}
fmt.Println("Converted to DXF")
w.Header().Add("Content-Type", "application/octet-stream")
w.Header().Add("Content-Length", fmt.Sprint(len(dxf)))
w.Header().Add("Content-Disposition", fmt.Sprintf("inline; filename=%s.dxf", randomString(7)))
fmt.Fprintf(w, string(dxf))
})
fmt.Println(http.ListenAndServe(":"+port, nil))
}
func createDXF(text, font string) ([]byte, error) {
fs := afero.NewOsFs()
afs := &afero.Afero{Fs: fs}
svgFile, _ := afs.TempFile(".", "*.svg")
epsFile, _ := afs.TempFile(".", "*.eps")
dxfFile, _ := afs.TempFile(".", "*.dxf")
err := template.
Must(
template.
New("template.svg").
Funcs(template.FuncMap{
"offset": func(i int) int {
return i * 30
},
"font": func() string {
return font
},
}).
ParseFS(content, "template.svg")).
Execute(svgFile, strings.Split(text, "\n"))
if err != nil {
fmt.Println(err)
return nil, err
}
cmd := exec.Command("inkscape", "-E", epsFile.Name(), svgFile.Name())
if err := cmd.Run(); err != nil {
fmt.Println(err)
return nil, err
}
cmd = exec.Command("pstoedit", "-q", "-dt", "-f", "dxf:-polyaslines -mm", epsFile.Name(), dxfFile.Name())
if err := cmd.Run(); err != nil {
fmt.Println(err)
return nil, err
}
return afs.ReadFile(dxfFile.Name())
}
func randomString(n int) string {
var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
s := make([]rune, n)
for i := range s {
s[i] = letters[rand.Intn(len(letters))]
}
return string(s)
}