aerc/widgets/msglist.go

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package widgets
import (
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"fmt"
"log"
"math"
"github.com/gdamore/tcell"
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"github.com/mattn/go-runewidth"
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"git.sr.ht/~sircmpwn/aerc/config"
"git.sr.ht/~sircmpwn/aerc/lib"
"git.sr.ht/~sircmpwn/aerc/lib/format"
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"git.sr.ht/~sircmpwn/aerc/lib/ui"
"git.sr.ht/~sircmpwn/aerc/models"
)
type MessageList struct {
ui.Invalidatable
conf *config.AercConfig
logger *log.Logger
height int
scroll int
nmsgs int
spinner *Spinner
store *lib.MessageStore
isInitalizing bool
aerc *Aerc
}
func NewMessageList(conf *config.AercConfig, logger *log.Logger, aerc *Aerc) *MessageList {
ml := &MessageList{
conf: conf,
logger: logger,
spinner: NewSpinner(&conf.Ui),
isInitalizing: true,
aerc: aerc,
}
ml.spinner.OnInvalidate(func(_ ui.Drawable) {
ml.Invalidate()
})
// TODO: stop spinner, probably
ml.spinner.Start()
return ml
}
func (ml *MessageList) Invalidate() {
ml.DoInvalidate(ml)
}
func (ml *MessageList) Draw(ctx *ui.Context) {
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ml.height = ctx.Height()
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
store := ml.Store()
if store == nil {
if ml.isInitalizing {
ml.spinner.Draw(ctx)
return
} else {
ml.spinner.Stop()
ml.drawEmptyMessage(ctx)
return
}
}
ml.ensureScroll()
needScrollbar := true
percentVisible := float64(ctx.Height()) / float64(len(store.Uids()))
if percentVisible >= 1.0 {
needScrollbar = false
}
textWidth := ctx.Width()
if needScrollbar {
textWidth -= 1
}
if textWidth < 0 {
textWidth = 0
}
var (
needsHeaders []uint32
row int = 0
)
uids := store.Uids()
for i := len(uids) - 1 - ml.scroll; i >= 0; i-- {
uid := uids[i]
msg := store.Messages[uid]
if row >= ctx.Height() {
break
}
if msg == nil {
needsHeaders = append(needsHeaders, uid)
ml.spinner.Draw(ctx.Subcontext(0, row, textWidth, 1))
row += 1
continue
}
style := tcell.StyleDefault
// current row
if row == ml.store.SelectedIndex()-ml.scroll {
style = style.Reverse(true)
}
// deleted message
if _, ok := store.Deleted[msg.Uid]; ok {
style = style.Foreground(tcell.ColorGray)
}
// unread message
seen := false
for _, flag := range msg.Flags {
if flag == models.SeenFlag {
seen = true
}
}
if !seen {
style = style.Bold(true)
}
ctx.Fill(0, row, textWidth, 1, ' ', style)
confParams := map[config.ContextType]string{
config.UI_CONTEXT_ACCOUNT: ml.aerc.SelectedAccount().AccountConfig().Name,
config.UI_CONTEXT_FOLDER: ml.aerc.SelectedAccount().Directories().Selected(),
}
if msg.Envelope != nil {
confParams[config.UI_CONTEXT_SUBJECT] = msg.Envelope.Subject
}
uiConfig := ml.conf.GetUiConfig(confParams)
fmtStr, args, err := format.ParseMessageFormat(
ml.aerc.SelectedAccount().acct.From,
uiConfig.IndexFormat,
uiConfig.TimestampFormat, "", i, msg, store.IsMarked(uid))
if err != nil {
ctx.Printf(0, row, style, "%v", err)
} else {
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line := fmt.Sprintf(fmtStr, args...)
line = runewidth.Truncate(line, textWidth, "…")
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ctx.Printf(0, row, style, "%s", line)
}
row += 1
}
if needScrollbar {
scrollbarCtx := ctx.Subcontext(ctx.Width()-1, 0, 1, ctx.Height())
ml.drawScrollbar(scrollbarCtx, percentVisible)
}
if len(uids) == 0 {
if store.Sorting {
ml.spinner.Start()
ml.spinner.Draw(ctx)
return
} else {
ml.drawEmptyMessage(ctx)
}
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}
if len(needsHeaders) != 0 {
store.FetchHeaders(needsHeaders, nil)
ml.spinner.Start()
} else {
ml.spinner.Stop()
}
}
func (ml *MessageList) drawScrollbar(ctx *ui.Context, percentVisible float64) {
gutterStyle := tcell.StyleDefault
pillStyle := tcell.StyleDefault.Reverse(true)
// gutter
ctx.Fill(0, 0, 1, ctx.Height(), ' ', gutterStyle)
// pill
pillSize := int(math.Ceil(float64(ctx.Height()) * percentVisible))
percentScrolled := float64(ml.scroll) / float64(len(ml.Store().Uids()))
pillOffset := int(math.Floor(float64(ctx.Height()) * percentScrolled))
ctx.Fill(0, pillOffset, 1, pillSize, ' ', pillStyle)
}
func (ml *MessageList) MouseEvent(localX int, localY int, event tcell.Event) {
switch event := event.(type) {
case *tcell.EventMouse:
switch event.Buttons() {
case tcell.Button1:
if ml.aerc == nil {
return
}
selectedMsg, ok := ml.Clicked(localX, localY)
if ok {
ml.Select(selectedMsg)
acct := ml.aerc.SelectedAccount()
if acct.Messages().Empty() {
return
}
store := acct.Messages().Store()
msg := acct.Messages().Selected()
if msg == nil {
return
}
lib.NewMessageStoreView(msg, store, ml.aerc.DecryptKeys,
func(view lib.MessageView, err error) {
if err != nil {
ml.aerc.PushError(err.Error())
return
}
viewer := NewMessageViewer(acct, ml.aerc.Config(), view)
ml.aerc.NewTab(viewer, msg.Envelope.Subject)
})
}
case tcell.WheelDown:
if ml.store != nil {
ml.store.Next()
}
ml.Invalidate()
case tcell.WheelUp:
if ml.store != nil {
ml.store.Prev()
}
ml.Invalidate()
}
}
}
func (ml *MessageList) Clicked(x, y int) (int, bool) {
store := ml.Store()
if store == nil || ml.nmsgs == 0 || y >= ml.nmsgs {
return 0, false
}
return y + ml.scroll, true
}
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func (ml *MessageList) Height() int {
return ml.height
}
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func (ml *MessageList) storeUpdate(store *lib.MessageStore) {
if ml.Store() != store {
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return
}
uids := store.Uids()
if len(uids) > 0 {
// When new messages come in, advance the cursor accordingly
// Note that this assumes new messages are appended to the top, which
// isn't necessarily true once we implement SORT... ideally we'd look
// for the previously selected UID.
if len(uids) > ml.nmsgs && ml.nmsgs != 0 {
for i := 0; i < len(uids)-ml.nmsgs; i++ {
ml.Store().Next()
}
}
if len(uids) < ml.nmsgs && ml.nmsgs != 0 {
for i := 0; i < ml.nmsgs-len(uids); i++ {
ml.Store().Prev()
}
}
ml.nmsgs = len(uids)
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}
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ml.Invalidate()
}
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func (ml *MessageList) SetStore(store *lib.MessageStore) {
if ml.Store() != store {
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ml.scroll = 0
}
ml.store = store
if store != nil {
ml.spinner.Stop()
ml.nmsgs = len(store.Uids())
store.OnUpdate(ml.storeUpdate)
} else {
ml.spinner.Start()
}
ml.Invalidate()
}
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func (ml *MessageList) SetInitDone() {
ml.isInitalizing = false
}
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func (ml *MessageList) Store() *lib.MessageStore {
return ml.store
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}
func (ml *MessageList) Empty() bool {
store := ml.Store()
return store == nil || len(store.Uids()) == 0
}
func (ml *MessageList) Selected() *models.MessageInfo {
store := ml.Store()
uids := store.Uids()
return store.Messages[uids[len(uids)-ml.store.SelectedIndex()-1]]
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}
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func (ml *MessageList) Select(index int) {
store := ml.Store()
store.Select(index)
ml.Invalidate()
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}
func (ml *MessageList) ensureScroll() {
store := ml.Store()
if store == nil || len(store.Uids()) == 0 {
return
}
h := ml.Height()
maxScroll := len(store.Uids()) - h
if maxScroll < 0 {
maxScroll = 0
}
selectedIndex := store.SelectedIndex()
if selectedIndex >= ml.scroll && selectedIndex < ml.scroll+h {
if ml.scroll > maxScroll {
ml.scroll = maxScroll
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}
return
}
if selectedIndex >= ml.scroll+h {
ml.scroll = selectedIndex - h + 1
} else if selectedIndex < ml.scroll {
ml.scroll = selectedIndex
}
if ml.scroll > maxScroll {
ml.scroll = maxScroll
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}
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}
func (ml *MessageList) drawEmptyMessage(ctx *ui.Context) {
msg := ml.aerc.SelectedAccount().UiConfig().EmptyMessage
ctx.Printf((ctx.Width()/2)-(len(msg)/2), 0,
tcell.StyleDefault, "%s", msg)
}