feat: mobi conversion

Will automatically convert .epub to .mobi on Kindle

convert/mobi.go

@@ -1,7 +1,10 @@
 package convert
 
 import (
+	"bytes"
+	"fmt"
 	"os/exec"
+	"path/filepath"
 	"sync"
 )
 
@@ -21,5 +24,34 @@ func (mc *MobiConverter) Convert(input string, output string) error {
 	mc.mutex.Lock()
 	defer mc.mutex.Unlock()
 
+	// KindleGen doesn't allow the input file to be in a different directory
+	// So set the working directory to the input file.
+	outDir, _ := filepath.Abs(filepath.Dir(input))
+
+	// And remove the directory from file paths
+	cmd := exec.Command("kindlegen",
+		filepath.Base(input),
+		"-dont_append_source", "-c1", "-o",
+		filepath.Base(output),
+	)
+	cmd.Dir = outDir
+
+	var out bytes.Buffer
+	var stderr bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = &stderr
+	err := cmd.Run()
+	if err != nil {
+		if exiterr, ok := err.(*exec.ExitError); ok {
+			if exiterr.ExitCode() != 1 {
+				fmt.Println(fmt.Sprint(err) + ": " + out.String() + ":" + stderr.String())
+				return err
+			}
+		} else {
+			fmt.Println(fmt.Sprint(err) + ": " + out.String() + ":" + stderr.String())
+			return err
+		}
+	}
+
 	return nil
 }