ref: master
pkg/bookends/bookends.go
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// bookends // Copyright (C) 2021 Honza Pokorny <honza@pokorny.ca> // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program. If not, see <https://www.gnu.org/licenses/>. package bookends import ( "bytes" "errors" "fmt" "html/template" "io" "net/http" "net/url" "os" "path" "sort" "strconv" "strings" "time" "github.com/gorilla/feeds" "github.com/niklasfasching/go-org/org" ) type Config struct { BookLogFilename string CacheDir string CoversDir string OutputFilename string AtomOutputFilename string TemplateFilename string } type AtomConfig struct { Name string Author string Email string Link string Description string } type Book struct { Author string Title string ISBN string DateRead time.Time Rating int Review template.HTML Tags []string } func (b *Book) Link(config AtomConfig) string { return fmt.Sprintf("%s/feed/update/%s", config.Link, b.ISBN) } type BooksByDateRead []Book func (r BooksByDateRead) Len() int { return len(r) } func (r BooksByDateRead) Swap(i, j int) { r[i], r[j] = r[j], r[i] } func (r BooksByDateRead) Less(i, j int) bool { return r[i].DateRead.After(r[j].DateRead) } func PathExists(path string) bool { _, err := os.Stat(path) if err == nil { return true } if os.IsNotExist(err) { return false } return false } func (b Book) CoverURL() (*url.URL, error) { // http: //covers.openlibrary.org/b/$key/$value-$size.jpg localPath := path.Join("covers", fmt.Sprintf("%s.jpg", b.ISBN)) if PathExists(localPath) { return url.Parse(localPath) } s := fmt.Sprintf("https://covers.openlibrary.org/b/isbn/%s-M.jpg", b.ISBN) return url.Parse(s) } func (b Book) CacheCoverURL() (*url.URL, error) { localPath := path.Join("cache", fmt.Sprintf("%s.jpg", b.ISBN)) return url.Parse(localPath) } func (b Book) DownloadCover(config Config) error { cachePath := path.Join(config.CacheDir, fmt.Sprintf("%s.jpg", b.ISBN)) if PathExists(cachePath) { return nil } coversPath := path.Join(config.CoversDir, fmt.Sprintf("%s.jpg", b.ISBN)) if PathExists(coversPath) { // Copy the file over err := copy(coversPath, cachePath) if err != nil { return err } return nil } coverUrl, err := b.CoverURL() if err != nil { return err } resp, err := http.Get(coverUrl.String()) if err != nil { return err } if resp.StatusCode > 201 { return errors.New("non 200 response:" + b.Title) } destination, err := os.Create(cachePath) if err != nil { return err } defer destination.Close() _, err = io.Copy(destination, resp.Body) if err != nil { return err } return nil } func (b Book) AtomContent() string { if b.Review == "" { return fmt.Sprintf("%s by %s, rated with %d stars", b.Title, b.Author, b.Rating) } return fmt.Sprintf("%s by %s, rated with %d stars\n\n%s", b.Title, b.Author, b.Rating, string(b.Review)) } func BuildHTML(config Config, books []Book) (string, error) { t, err := template.ParseFiles(config.TemplateFilename) if err != nil { return "", err } out := bytes.NewBuffer(nil) err = t.Execute(out, books) if err != nil { return "", err } return out.String(), nil } func WriteFile(filename string, contents string) error { f, err := os.Create(filename) defer f.Close() if err != nil { return err } _, err = f.WriteString(contents) if err != nil { return err } return nil } func BuildAtom(books []Book, config AtomConfig) (string, error) { now := time.Now() author := &feeds.Author{Name: config.Author, Email: config.Email} feed := &feeds.Feed{ Title: config.Name, Link: &feeds.Link{Href: config.Link}, Description: config.Description, Author: author, Created: now, } var items []*feeds.Item for _, book := range books { item := &feeds.Item{ Title: book.Title, // NOTE: if feeds.Link.Href is empty, each item will appear new each time // the feed is updated Link: &feeds.Link{Href: book.Link(config)}, Content: book.AtomContent(), Author: author, Created: book.DateRead, } items = append(items, item) } feed.Items = items return feed.ToAtom() } func Build(config Config) error { f, err := os.Open(config.BookLogFilename) if err != nil { return err } books, atomConfig, err := ParseOrgFile(f) if err != nil { return err } sort.Sort(BooksByDateRead(books)) htmlOutput, err := BuildHTML(config, books) if err != nil { return err } err = WriteFile(config.OutputFilename, htmlOutput) if err != nil { return err } atom, err := BuildAtom(books, atomConfig) if err != nil { return err } err = WriteFile(config.AtomOutputFilename, atom) if err != nil { return err } return nil } func ParseAtomConfig(drawer org.PropertyDrawer) AtomConfig { name, _ := drawer.Get("ATOM_NAME") author, _ := drawer.Get("ATOM_AUTHOR") description, _ := drawer.Get("ATOM_DESCRIPTION") link, _ := drawer.Get("ATOM_LINK") return AtomConfig{ Name: name, Author: author, Description: description, Link: link, } } func ParseOrgFile(input io.Reader) ([]Book, AtomConfig, error) { books := []Book{} conf := org.New() d := conf.Parse(input, "") documentProperties := d.Nodes[0].(org.PropertyDrawer) atomConfig := ParseAtomConfig(documentProperties) for _, child := range d.Outline.Children { for _, sub := range child.Children { tags := []string{} for _, t := range sub.Headline.Tags { tags = append(tags, strings.ReplaceAll(t, "_", "-")) } book := Book{ Title: sub.Headline.Title[0].String(), Tags: tags, } rest := bytes.NewBufferString("") for _, c := range sub.Headline.Children { switch t := c.(type) { case org.PropertyDrawer: author, ok := t.Get("AUTHOR") if ok { book.Author = author } rating, ok := t.Get("RATING") if ok { ratingInt, err := strconv.ParseInt(rating, 10, 8) if err != nil { return books, atomConfig, err } book.Rating = int(ratingInt) } isbn, ok := t.Get("ISBN") if ok { book.ISBN = isbn } case org.Paragraph: s := t.String() if strings.HasPrefix(s, "CLOSED") { s = strings.TrimSpace(s) dt, err := time.Parse("CLOSED: [2006-01-02 Mon 15:04]", s) if err != nil { return books, atomConfig, err } book.DateRead = dt continue } fmt.Fprintln(rest, "") fmt.Fprint(rest, "<p>") for _, w := range t.Children { switch wt := w.(type) { case org.Text: fmt.Fprintln(rest, wt) case org.Emphasis: switch wt.Kind { case "*": fmt.Fprintf(rest, "<b>%s</b>", wt.Content[0].String()) case "/": fmt.Fprintf(rest, "<em>%s</em>", wt.Content[0].String()) case "=": fmt.Fprintf(rest, "<code>%s</code>", wt.Content[0].String()) } case org.Timestamp: if wt.IsDate { fmt.Fprintln(rest, wt.Time.Format("January 2, 2006")) } else { fmt.Fprintln(rest, wt.Time.Format("January 2, 2006 at 15:04")) } case org.RegularLink: fmt.Fprintf(rest, `<a href="%s">%s</a>`, wt.URL, wt.Description[0]) case org.LineBreak: continue default: } } fmt.Fprintln(rest, "</p>") fmt.Fprintln(rest, "") case org.Block: if t.Name == "QUOTE" { fmt.Fprintln(rest, "<blockquote>") for _, p := range t.Children { fmt.Fprintf(rest, "%s<br>", p) } fmt.Fprintln(rest, "</blockquote>") } case org.List: if t.Kind == "ordered" { fmt.Fprint(rest, "<ol>") } else { fmt.Fprint(rest, "<ul>") } for _, w := range t.Items { switch wt := w.(type) { case org.ListItem: fmt.Fprintf(rest, `<li>%s</li>`, wt.Children[0].String()) default: } } if t.Kind == "ordered" { fmt.Fprint(rest, "</ol>") } else { fmt.Fprint(rest, "</ul>") } case org.LineBreak: fmt.Fprintln(rest, "") default: } } book.Review = template.HTML(rest.String()) books = append(books, book) } } return books, atomConfig, nil } func copy(src, dst string) error { sourceFileStat, err := os.Stat(src) if err != nil { return err } if !sourceFileStat.Mode().IsRegular() { return fmt.Errorf("%s is not a regular file", src) } source, err := os.Open(src) if err != nil { return err } defer source.Close() destination, err := os.Create(dst) if err != nil { return err } defer destination.Close() _, err = io.Copy(destination, source) return err } func CacheCovers(config Config) error { f, err := os.Open(config.BookLogFilename) if err != nil { return err } books, _, err := ParseOrgFile(f) if err != nil { return err } for _, book := range books { err = book.DownloadCover(config) if err != nil { return err } } return nil } |