Factor UI models out of the worker message package

Before, the information needed to display different parts of the UI was
tightly coupled to the specific messages being sent back and forth to
the backend worker. Separating out a models package allows us to be more
specific about exactly what a backend is able to and required to
provide for the UI.

lib/indexformat.go

@@ -9,11 +9,11 @@ import (
 	"github.com/emersion/go-imap"
 
 	"git.sr.ht/~sircmpwn/aerc/config"
-	"git.sr.ht/~sircmpwn/aerc/worker/types"
+	"git.sr.ht/~sircmpwn/aerc/models"
 )
 
 func ParseIndexFormat(conf *config.AercConfig, number int,
-	msg *types.MessageInfo) (string, []interface{}, error) {
+	msg *models.MessageInfo) (string, []interface{}, error) {
 
 	format := conf.Ui.IndexFormat
 	retval := make([]byte, 0, len(format))

lib/msgstore.go

@@ -6,14 +6,15 @@ import (
 
 	"github.com/emersion/go-imap"
 
+	"git.sr.ht/~sircmpwn/aerc/models"
 	"git.sr.ht/~sircmpwn/aerc/worker/types"
 )
 
 // Accesses to fields must be guarded by MessageStore.Lock/Unlock
 type MessageStore struct {
 	Deleted  map[uint32]interface{}
-	DirInfo  types.DirectoryInfo
+	DirInfo  models.DirectoryInfo
-	Messages map[uint32]*types.MessageInfo
+	Messages map[uint32]*models.MessageInfo
 	// Ordered list of known UIDs
 	Uids []uint32
 
@@ -33,7 +34,7 @@ type MessageStore struct {
 }
 
 func NewMessageStore(worker *types.Worker,
-	dirInfo *types.DirectoryInfo) *MessageStore {
+	dirInfo *models.DirectoryInfo) *MessageStore {
 
 	return &MessageStore{
 		Deleted: make(map[uint32]interface{}),
@@ -106,11 +107,11 @@ func (store *MessageStore) FetchBodyPart(
 		if !ok {
 			return
 		}
-		cb(msg.Reader)
+		cb(msg.Part.Reader)
 	})
 }
 
-func merge(to *types.MessageInfo, from *types.MessageInfo) {
+func merge(to *models.MessageInfo, from *models.MessageInfo) {
 	if from.BodyStructure != nil {
 		to.BodyStructure = from.BodyStructure
 	}
@@ -131,11 +132,11 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 	update := false
 	switch msg := msg.(type) {
 	case *types.DirectoryInfo:
-		store.DirInfo = *msg
+		store.DirInfo = *msg.Info
 		store.worker.PostAction(&types.FetchDirectoryContents{}, nil)
 		update = true
 	case *types.DirectoryContents:
-		newMap := make(map[uint32]*types.MessageInfo)
+		newMap := make(map[uint32]*models.MessageInfo)
 		for _, uid := range msg.Uids {
 			if msg, ok := store.Messages[uid]; ok {
 				newMap[uid] = msg
@@ -147,14 +148,14 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 		store.Uids = msg.Uids
 		update = true
 	case *types.MessageInfo:
-		if existing, ok := store.Messages[msg.Uid]; ok && existing != nil {
+		if existing, ok := store.Messages[msg.Info.Uid]; ok && existing != nil {
-			merge(existing, msg)
+			merge(existing, msg.Info)
 		} else {
-			store.Messages[msg.Uid] = msg
+			store.Messages[msg.Info.Uid] = msg.Info
 		}
-		if _, ok := store.pendingHeaders[msg.Uid]; msg.Envelope != nil && ok {
+		if _, ok := store.pendingHeaders[msg.Info.Uid]; msg.Info.Envelope != nil && ok {
-			delete(store.pendingHeaders, msg.Uid)
+			delete(store.pendingHeaders, msg.Info.Uid)
-			if cbs, ok := store.headerCallbacks[msg.Uid]; ok {
+			if cbs, ok := store.headerCallbacks[msg.Info.Uid]; ok {
 				for _, cb := range cbs {
 					cb(msg)
 				}
@@ -162,11 +163,11 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 		}
 		update = true
 	case *types.FullMessage:
-		if _, ok := store.pendingBodies[msg.Uid]; ok {
+		if _, ok := store.pendingBodies[msg.Content.Uid]; ok {
-			delete(store.pendingBodies, msg.Uid)
+			delete(store.pendingBodies, msg.Content.Uid)
-			if cbs, ok := store.bodyCallbacks[msg.Uid]; ok {
+			if cbs, ok := store.bodyCallbacks[msg.Content.Uid]; ok {
 				for _, cb := range cbs {
-					cb(msg.Reader)
+					cb(msg.Content.Reader)
 				}
 			}
 		}
@@ -283,7 +284,7 @@ func (store *MessageStore) Read(uids []uint32, read bool,
 	}, cb)
 }
 
-func (store *MessageStore) Selected() *types.MessageInfo {
+func (store *MessageStore) Selected() *models.MessageInfo {
 	return store.Messages[store.Uids[len(store.Uids)-store.selected-1]]
 }
 

models/models.go

@@ -0,0 +1,52 @@
+package models
+
+import (
+	"io"
+	"time"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-message/mail"
+)
+
+type Directory struct {
+	Name       string
+	Attributes []string
+}
+
+type DirectoryInfo struct {
+	Name     string
+	Flags    []string
+	ReadOnly bool
+
+	// The total number of messages in this mailbox.
+	Exists int
+
+	// The number of messages not seen since the last time the mailbox was opened.
+	Recent int
+
+	// The number of unread messages
+	Unseen int
+}
+
+// A MessageInfo holds information about the structure of a message
+type MessageInfo struct {
+	BodyStructure *imap.BodyStructure
+	Envelope      *imap.Envelope
+	Flags         []string
+	InternalDate  time.Time
+	RFC822Headers *mail.Header
+	Size          uint32
+	Uid           uint32
+}
+
+// A MessageBodyPart can be displayed in the message viewer
+type MessageBodyPart struct {
+	Reader io.Reader
+	Uid    uint32
+}
+
+// A FullMessage is the entire message
+type FullMessage struct {
+	Reader io.Reader
+	Uid    uint32
+}

widgets/account.go

@@ -9,6 +9,7 @@ import (
 	"git.sr.ht/~sircmpwn/aerc/config"
 	"git.sr.ht/~sircmpwn/aerc/lib"
 	"git.sr.ht/~sircmpwn/aerc/lib/ui"
+	"git.sr.ht/~sircmpwn/aerc/models"
 	"git.sr.ht/~sircmpwn/aerc/worker"
 	"git.sr.ht/~sircmpwn/aerc/worker/types"
 )
@@ -169,7 +170,7 @@ func (acct *AccountView) SelectedAccount() *AccountView {
 	return acct
 }
 
-func (acct *AccountView) SelectedMessage() *types.MessageInfo {
+func (acct *AccountView) SelectedMessage() *models.MessageInfo {
 	return acct.msglist.Selected()
 }
 
@@ -195,11 +196,11 @@ func (acct *AccountView) onMessage(msg types.WorkerMessage) {
 			acct.dirlist.UpdateList(nil)
 		}
 	case *types.DirectoryInfo:
-		if store, ok := acct.msgStores[msg.Name]; ok {
+		if store, ok := acct.msgStores[msg.Info.Name]; ok {
 			store.Update(msg)
 		} else {
-			store = lib.NewMessageStore(acct.worker, msg)
+			store = lib.NewMessageStore(acct.worker, msg.Info)
-			acct.msgStores[msg.Name] = store
+			acct.msgStores[msg.Info.Name] = store
 			store.OnUpdate(func(_ *lib.MessageStore) {
 				store.OnUpdate(nil)
 				acct.msglist.SetStore(store)

widgets/dirlist.go

@@ -55,7 +55,7 @@ func (dirlist *DirectoryList) UpdateList(done func(dirs []string)) {
 
 			switch msg := msg.(type) {
 			case *types.Directory:
-				dirs = append(dirs, msg.Name)
+				dirs = append(dirs, msg.Dir.Name)
 			case *types.Done:
 				sort.Strings(dirs)
 				dirlist.store.Update(dirs)

widgets/msglist.go

@@ -11,7 +11,7 @@ import (
 	"git.sr.ht/~sircmpwn/aerc/config"
 	"git.sr.ht/~sircmpwn/aerc/lib"
 	"git.sr.ht/~sircmpwn/aerc/lib/ui"
-	"git.sr.ht/~sircmpwn/aerc/worker/types"
+	"git.sr.ht/~sircmpwn/aerc/models"
 )
 
 type MessageList struct {
@@ -176,7 +176,7 @@ func (ml *MessageList) Empty() bool {
 	return store == nil || len(store.Uids) == 0
 }
 
-func (ml *MessageList) Selected() *types.MessageInfo {
+func (ml *MessageList) Selected() *models.MessageInfo {
 	store := ml.Store()
 	return store.Messages[store.Uids[len(store.Uids)-ml.store.SelectedIndex()-1]]
 }

widgets/msgviewer.go

@@ -20,7 +20,7 @@ import (
 	"git.sr.ht/~sircmpwn/aerc/config"
 	"git.sr.ht/~sircmpwn/aerc/lib"
 	"git.sr.ht/~sircmpwn/aerc/lib/ui"
-	"git.sr.ht/~sircmpwn/aerc/worker/types"
+	"git.sr.ht/~sircmpwn/aerc/models"
 )
 
 var ansi = regexp.MustCompile("^\x1B\\[[0-?]*[ -/]*[@-~]")
@@ -31,7 +31,7 @@ type MessageViewer struct {
 	conf     *config.AercConfig
 	err      error
 	grid     *ui.Grid
-	msg      *types.MessageInfo
+	msg      *models.MessageInfo
 	switcher *PartSwitcher
 	store    *lib.MessageStore
 }
@@ -44,7 +44,7 @@ type PartSwitcher struct {
 }
 
 func NewMessageViewer(acct *AccountView, conf *config.AercConfig,
-	store *lib.MessageStore, msg *types.MessageInfo) *MessageViewer {
+	store *lib.MessageStore, msg *models.MessageInfo) *MessageViewer {
 
 	grid := ui.NewGrid().Rows([]ui.GridSpec{
 		{ui.SIZE_EXACT, 4}, // TODO: Based on number of header rows
@@ -112,7 +112,7 @@ handle_error:
 }
 
 func enumerateParts(conf *config.AercConfig, store *lib.MessageStore,
-	msg *types.MessageInfo, body *imap.BodyStructure,
+	msg *models.MessageInfo, body *imap.BodyStructure,
 	showHeaders bool, index []int) ([]*PartViewer, error) {
 
 	var parts []*PartViewer
@@ -140,7 +140,7 @@ func enumerateParts(conf *config.AercConfig, store *lib.MessageStore,
 }
 
 func createSwitcher(switcher *PartSwitcher, conf *config.AercConfig,
-	store *lib.MessageStore, msg *types.MessageInfo, showHeaders bool) error {
+	store *lib.MessageStore, msg *models.MessageInfo, showHeaders bool) error {
 	var err error
 	switcher.showHeaders = showHeaders
 
@@ -212,7 +212,7 @@ func (mv *MessageViewer) SelectedAccount() *AccountView {
 	return mv.acct
 }
 
-func (mv *MessageViewer) SelectedMessage() *types.MessageInfo {
+func (mv *MessageViewer) SelectedMessage() *models.MessageInfo {
 	return mv.msg
 }
 
@@ -321,7 +321,7 @@ type PartViewer struct {
 	fetched     bool
 	filter      *exec.Cmd
 	index       []int
-	msg         *types.MessageInfo
+	msg         *models.MessageInfo
 	pager       *exec.Cmd
 	pagerin     io.WriteCloser
 	part        *imap.BodyStructure
@@ -333,7 +333,7 @@ type PartViewer struct {
 }
 
 func NewPartViewer(conf *config.AercConfig,
-	store *lib.MessageStore, msg *types.MessageInfo,
+	store *lib.MessageStore, msg *models.MessageInfo,
 	part *imap.BodyStructure, showHeaders bool,
 	index []int) (*PartViewer, error) {
 

widgets/providesmessage.go

@@ -5,7 +5,7 @@ import (
 
 	"git.sr.ht/~sircmpwn/aerc/lib"
 	"git.sr.ht/~sircmpwn/aerc/lib/ui"
-	"git.sr.ht/~sircmpwn/aerc/worker/types"
+	"git.sr.ht/~sircmpwn/aerc/models"
 )
 
 type PartInfo struct {
@@ -19,6 +19,6 @@ type ProvidesMessage interface {
 	ui.Drawable
 	Store() *lib.MessageStore
 	SelectedAccount() *AccountView
-	SelectedMessage() *types.MessageInfo
+	SelectedMessage() *models.MessageInfo
 	SelectedMessagePart() *PartInfo
 }

worker/imap/fetch.go

@@ -8,6 +8,7 @@ import (
 	"github.com/emersion/go-message/mail"
 	"github.com/emersion/go-message/textproto"
 
+	"git.sr.ht/~sircmpwn/aerc/models"
 	"git.sr.ht/~sircmpwn/aerc/worker/types"
 )
 
@@ -82,39 +83,49 @@ func (imapw *IMAPWorker) handleFetchMessages(
 					header = &mail.Header{message.Header{textprotoHeader}}
 				}
 				imapw.worker.PostMessage(&types.MessageInfo{
-					Message:       types.RespondTo(msg),
+					Message: types.RespondTo(msg),
-					BodyStructure: _msg.BodyStructure,
+					Info: &models.MessageInfo{
-					Envelope:      _msg.Envelope,
+						BodyStructure: _msg.BodyStructure,
-					Flags:         _msg.Flags,
+						Envelope:      _msg.Envelope,
-					InternalDate:  _msg.InternalDate,
+						Flags:         _msg.Flags,
-					RFC822Headers: header,
+						InternalDate:  _msg.InternalDate,
-					Uid:           _msg.Uid,
+						RFC822Headers: header,
+						Uid:           _msg.Uid,
+					},
 				}, nil)
 			case *types.FetchFullMessages:
 				reader := _msg.GetBody(section)
 				imapw.worker.PostMessage(&types.FullMessage{
 					Message: types.RespondTo(msg),
-					Reader:  reader,
+					Content: &models.FullMessage{
-					Uid:     _msg.Uid,
+						Reader: reader,
+						Uid:    _msg.Uid,
+					},
 				}, nil)
 				// Update flags (to mark message as read)
 				imapw.worker.PostMessage(&types.MessageInfo{
 					Message: types.RespondTo(msg),
-					Flags:   _msg.Flags,
+					Info: &models.MessageInfo{
-					Uid:     _msg.Uid,
+						Flags: _msg.Flags,
+						Uid:   _msg.Uid,
+					},
 				}, nil)
 			case *types.FetchMessageBodyPart:
 				reader := _msg.GetBody(section)
 				imapw.worker.PostMessage(&types.MessageBodyPart{
 					Message: types.RespondTo(msg),
-					Reader:  reader,
+					Part: &models.MessageBodyPart{
-					Uid:     _msg.Uid,
+						Reader: reader,
+						Uid:    _msg.Uid,
+					},
 				}, nil)
 				// Update flags (to mark message as read)
 				imapw.worker.PostMessage(&types.MessageInfo{
 					Message: types.RespondTo(msg),
-					Flags:   _msg.Flags,
+					Info: &models.MessageInfo{
-					Uid:     _msg.Uid,
+						Flags: _msg.Flags,
+						Uid:   _msg.Uid,
+					},
 				}, nil)
 			}
 		}

worker/imap/list.go

@@ -3,6 +3,7 @@ package imap
 import (
 	"github.com/emersion/go-imap"
 
+	"git.sr.ht/~sircmpwn/aerc/models"
 	"git.sr.ht/~sircmpwn/aerc/worker/types"
 )
 
@@ -18,9 +19,11 @@ func (imapw *IMAPWorker) handleListDirectories(msg *types.ListDirectories) {
 				continue
 			}
 			imapw.worker.PostMessage(&types.Directory{
-				Message:    types.RespondTo(msg),
+				Message: types.RespondTo(msg),
-				Name:       mbox.Name,
+				Dir: &models.Directory{
-				Attributes: mbox.Attributes,
+					Name:       mbox.Name,
+					Attributes: mbox.Attributes,
+				},
 			}, nil)
 		}
 		done <- nil

worker/imap/worker.go

@@ -10,6 +10,7 @@ import (
 	idle "github.com/emersion/go-imap-idle"
 	"github.com/emersion/go-imap/client"
 
+	"git.sr.ht/~sircmpwn/aerc/models"
 	"git.sr.ht/~sircmpwn/aerc/worker/types"
 )
 
@@ -169,13 +170,15 @@ func (w *IMAPWorker) handleImapUpdate(update client.Update) {
 			w.selected = *status
 		}
 		w.worker.PostMessage(&types.DirectoryInfo{
-			Flags:    status.Flags,
+			Info: &models.DirectoryInfo{
-			Name:     status.Name,
+				Flags:    status.Flags,
-			ReadOnly: status.ReadOnly,
+				Name:     status.Name,
+				ReadOnly: status.ReadOnly,
 
-			Exists: int(status.Messages),
+				Exists: int(status.Messages),
-			Recent: int(status.Recent),
+				Recent: int(status.Recent),
-			Unseen: int(status.Unseen),
+				Unseen: int(status.Unseen),
+			},
 		}, nil)
 	case *client.MessageUpdate:
 		msg := update.Message
@@ -183,11 +186,13 @@ func (w *IMAPWorker) handleImapUpdate(update client.Update) {
 			msg.Uid = w.seqMap[msg.SeqNum-1]
 		}
 		w.worker.PostMessage(&types.MessageInfo{
-			BodyStructure: msg.BodyStructure,
+			Info: &models.MessageInfo{
-			Envelope:      msg.Envelope,
+				BodyStructure: msg.BodyStructure,
-			Flags:         msg.Flags,
+				Envelope:      msg.Envelope,
-			InternalDate:  msg.InternalDate,
+				Flags:         msg.Flags,
-			Uid:           msg.Uid,
+				InternalDate:  msg.InternalDate,
+				Uid:           msg.Uid,
+			},
 		}, nil)
 	case *client.ExpungeUpdate:
 		i := update.SeqNum - 1

worker/types/messages.go

@@ -5,9 +5,9 @@ import (
 	"time"
 
 	"github.com/emersion/go-imap"
-	"github.com/emersion/go-message/mail"
 
 	"git.sr.ht/~sircmpwn/aerc/config"
+	"git.sr.ht/~sircmpwn/aerc/models"
 )
 
 type WorkerMessage interface {
@@ -139,17 +139,12 @@ type AppendMessage struct {
 
 type Directory struct {
 	Message
-	Attributes []string
+	Dir *models.Directory
-	Name       string
 }
 
 type DirectoryInfo struct {
 	Message
-	Flags    []string
+	Info *models.DirectoryInfo
-	Name     string
-	ReadOnly bool
-
-	Exists, Recent, Unseen int
 }
 
 type DirectoryContents struct {
@@ -164,25 +159,17 @@ type SearchResults struct {
 
 type MessageInfo struct {
 	Message
-	BodyStructure *imap.BodyStructure
+	Info *models.MessageInfo
-	Envelope      *imap.Envelope
-	Flags         []string
-	InternalDate  time.Time
-	RFC822Headers *mail.Header
-	Size          uint32
-	Uid           uint32
 }
 
 type FullMessage struct {
 	Message
-	Reader io.Reader
+	Content *models.FullMessage
-	Uid    uint32
 }
 
 type MessageBodyPart struct {
 	Message
-	Reader io.Reader
+	Part *models.MessageBodyPart
-	Uid    uint32
 }
 
 type MessagesDeleted struct {