1package main
 2
 3import (
 4	"io"
 5	"net/http"
 6	"os"
 7	"os/exec"
 8	"path/filepath"
 9	"strings"
10)
11
12var conversionMap = map[string]string{
13	".docx": ".pdf",
14	".odt":  ".pdf",
15	".epub": ".html",
16	".md":   ".pdf",
17}
18
19func SplitFilename(filename string) (name, ext string) {
20	ext = strings.ToLower(filepath.Ext(filename))
21	name = filename[:len(filename)-len(ext)]
22	return name, ext
23}
24
25func JoinFilename(name, ext string) string {
26	if len(ext) > 0 && ext[0] != '.' {
27		ext = "." + ext
28	}
29	return name + ext
30}
31
32func DownloadFile(filePath string, url string) error {
33	resp, err := http.Get(url)
34	if err != nil {
35		return err
36	}
37	defer resp.Body.Close()
38
39	out, err := os.Create(filePath)
40	if err != nil {
41		return err
42	}
43	defer out.Close()
44
45	_, err = io.Copy(out, resp.Body)
46	return err
47}
48
49func ConvertFile(inputFile string) (string, string) {
50	fileName, fileExtension := SplitFilename(inputFile)
51
52	outputExtension, exists := conversionMap[fileExtension]
53	if !exists {
54		println("Error. Format not supported:", fileExtension)
55		return "", ""
56	}
57
58	outputFile := JoinFilename(fileName, outputExtension)
59	println("Converting...")
60	cmd := exec.Command("pandoc", inputFile, "--pdf-engine=tectonic", "-o", outputFile)
61
62	output, err := cmd.CombinedOutput()
63	if err != nil {
64		println("Error. Command execution failed:", err)
65		return "", ""
66	}
67	println(output)
68	return fileName, outputExtension
69}