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// Copyright 2021 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
// dlgbook is a wrapper around getgbook which gets metadata and uses
// it to save to a specially formatted directory
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"path"
"strings"
"unicode"
)
const usage = `Usage: dlgbook bookid [-a author] [-y year] [-t title] [savedir]
Downloads all pages from a Google Book, using the getgbook
tool, extracting the date, author name and title from
Google Books (unless given as arguments to dlgbook), and
saves them into a directory named YEAR_AUTHORSURNAME_Title_bookid
`
const maxPartLength = 48
// formatAuthors formats a list of authors by just selecting
// the first one listed, and returning the uppercased final
// name.
func formatAuthors(authors []string) string {
if len(authors) == 0 {
return ""
}
s := authors[0]
parts := strings.Fields(s)
if len(parts) > 1 {
s = parts[len(parts)-1]
}
s = strings.ToUpper(s)
if len(s) > maxPartLength {
s = s[:maxPartLength]
}
s = strings.Map(stripNonLetters, s)
return s
}
// mapTitle is a function for strings.Map to strip out
// unwanted characters from the title.
func stripNonLetters(r rune) rune {
if !unicode.IsLetter(r) {
return -1
}
return r
}
// formatTitle formats a title to our preferences, notably
// by stripping spaces and punctuation characters.
func formatTitle(title string) string {
s := strings.Map(stripNonLetters, title)
if len(s) > maxPartLength {
s = s[:maxPartLength]
}
return s
}
// getMetadata queries Google Books for metadata we care about
// and returns it formatted as we need it.
func getMetadata(id string) (string, string, string, error) {
var author, title, year string
url := fmt.Sprintf("https://www.googleapis.com/books/v1/volumes/%s", id)
// designed to be unmarshalled by encoding/json's Unmarshal()
type bookInfo struct {
VolumeInfo struct {
Title string
Authors []string
PublishedDate string
}
}
resp, err := http.Get(url)
if err != nil {
return author, title, year, fmt.Errorf("Error downloading metadata %s: %v", url, err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return author, title, year, fmt.Errorf("Error downloading metadata %s: %v", url, err)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return author, title, year, fmt.Errorf("Error reading metadata %s: %v", url, err)
}
v := bookInfo{}
err = json.Unmarshal(b, &v)
if err != nil {
return author, title, year, fmt.Errorf("Error parsing metadata %s: %v", url, err)
}
author = formatAuthors(v.VolumeInfo.Authors)
title = formatTitle(v.VolumeInfo.Title)
year = v.VolumeInfo.PublishedDate
return author, title, year, nil
}
func main() {
author := flag.String("author", "", "Set author, rather than autodetecting")
title := flag.String("title", "", "Set title, rather than autodetecting")
year := flag.String("year", "", "Set year, rather than autodetecting")
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), usage)
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() < 1 {
flag.Usage()
return
}
bookid := flag.Arg(0)
if *author == "" || *title == "" || *year == "" {
a, t, y, err := getMetadata(bookid)
if err != nil {
log.Fatal(err)
}
if *author == "" {
*author = a
}
if *title == "" {
*title = t
}
if *year == "" {
*year = y
}
}
dir := fmt.Sprintf("%s_%s_%s_%s", *year, *author, *title, bookid)
err := os.MkdirAll(dir, 0755)
if err != nil {
log.Fatalf("Couldn't create directory %s: %v", dir, err)
}
fmt.Printf("Saving book to %s\n", dir)
cmd := exec.Command("getgbook", bookid)
cmd.Dir = dir
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err = cmd.Run()
if err != nil {
log.Fatalf("Error running getgbook %s: %v", bookid, err)
}
// getgbook downloads into bookid directory, so move files out of
// there directly into dir
tmpdir := path.Join(dir, bookid)
f, err := os.Open(tmpdir)
if err != nil {
log.Fatalf("Failed to open %s to move files: %v", tmpdir, err)
}
files, err := f.Readdir(0)
if err != nil {
log.Fatalf("Failed to readdir %s to move files: %v", tmpdir, err)
}
for _, v := range files {
orig := path.Join(tmpdir, v.Name())
new := path.Join(dir, v.Name())
err = os.Rename(orig, new)
if err != nil {
log.Fatalf("Failed to move %s to %s: %v", orig, new, err)
}
}
err = os.Remove(tmpdir)
if err != nil {
log.Fatalf("Failed to remove temporary directory %s: %v", tmpdir, err)
}
fmt.Printf("Successfully download to %s\n", dir)
}
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