package maildir
import (
"fmt"
"io"
"io/ioutil"
"log"
"path/filepath"
"sort"
"github.com/emersion/go-maildir"
"git.sr.ht/~sircmpwn/aerc/lib/uidstore"
)
// A Container is a directory which contains other directories which adhere to
// the Maildir spec
type Container struct {
dir string
log *log.Logger
uids *uidstore.Store
}
// NewContainer creates a new container at the specified directory
// TODO: return an error if the provided directory is not accessible
func NewContainer(dir string, l *log.Logger) *Container {
return &Container{dir: dir, uids: uidstore.NewStore(), log: l}
}
// ListFolders returns a list of maildir folders in the container
func (c *Container) ListFolders() ([]string, error) {
files, err := ioutil.ReadDir(c.dir)
if err != nil {
return nil, fmt.Errorf("error reading folders: %v", err)
}
dirnames := []string{}
for _, f := range files {
if f.IsDir() {
dirnames = append(dirnames, f.Name())
}
}
return dirnames, nil
}
// OpenDirectory opens an existing maildir in the container by name, moves new
// messages into cur, and registers the new keys in the UIDStore.
func (c *Container) OpenDirectory(name string) (maildir.Dir, error) {
dir := c.Dir(name)
keys, err := dir.Unseen()
if err != nil {
return dir, err
}
for _, key := range keys {
c.uids.GetOrInsert(key)
}
return dir, nil
}
// Dir returns a maildir.Dir with the specified name inside the container
func (c *Container) Dir(name string) maildir.Dir {
return maildir.Dir(filepath.Join(c.dir, name))
}
// UIDs fetches the unique message identifiers for the maildir
func (c *Container) UIDs(d maildir.Dir) ([]uint32, error) {
keys, err := d.Keys()
if err != nil {
return nil, fmt.Errorf("could not get keys for %s: %v", d, err)
}
sort.Strings(keys)
var uids []uint32
for _, key := range keys {
uids = append(uids, c.uids.GetOrInsert(key))
}
return uids, nil
}
// Message returns a Message struct for the given UID and maildir
func (c *Container) Message(d maildir.Dir, uid uint32) (*Message, error) {
if key, ok := c.uids.GetKey(uid); ok {
return &Message{
dir: d,
uid: uid,
key: key,
}, nil
}
return nil, fmt.Errorf("could not find message with uid %d in maildir %s",
uid, d)
}
// DeleteAll deletes a set of messages by UID and returns the subset of UIDs
// which were successfully deleted, stopping upon the first error.
func (c *Container) DeleteAll(d maildir.Dir, uids []uint32) ([]uint32, error) {
var success []uint32
for _, uid := range uids {
msg, err := c.Message(d, uid)
if err != nil {
return success, err
}
if err := msg.Remove(); err != nil {
return success, err
}
success = append(success, uid)
}
return success, nil
}
func (c *Container) CopyAll(
dest maildir.Dir, src maildir.Dir, uids []uint32) error {
for _, uid := range uids {
if err := c.copyMessage(dest, src, uid); err != nil {
return fmt.Errorf("could not copy message %d: %v", uid, err)
}
}
return nil
}
func (c *Container) copyMessage(
dest maildir.Dir, src maildir.Dir, uid uint32) error {
key, ok := c.uids.GetKey(uid)
if !ok {
return fmt.Errorf("could not find key for message id %d", uid)
}
f, err := src.Open(key)
if err != nil {
return fmt.Errorf("could not open source message: %v", err)
}
del, err := dest.NewDelivery()
if err != nil {
return fmt.Errorf("could not initialize delivery: %v", err)
}
defer del.Close()
if _, err = io.Copy(del, f); err != nil {
return fmt.Errorf("could not copy message to delivery: %v", err)
}
// TODO: preserve flags
return nil
}