510 lines
11 KiB
Go
510 lines
11 KiB
Go
package widgets
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import (
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"bytes"
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"fmt"
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"io"
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"os/exec"
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"strings"
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"github.com/danwakefield/fnmatch"
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"github.com/emersion/go-imap"
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"github.com/emersion/go-message"
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_ "github.com/emersion/go-message/charset"
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"github.com/emersion/go-message/mail"
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"github.com/gdamore/tcell"
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"github.com/google/shlex"
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"github.com/mattn/go-runewidth"
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"git.sr.ht/~sircmpwn/aerc/config"
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"git.sr.ht/~sircmpwn/aerc/lib"
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"git.sr.ht/~sircmpwn/aerc/lib/ui"
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"git.sr.ht/~sircmpwn/aerc/worker/types"
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)
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type MessageViewer struct {
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ui.Invalidatable
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acct *AccountView
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conf *config.AercConfig
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err error
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grid *ui.Grid
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msg *types.MessageInfo
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switcher *PartSwitcher
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store *lib.MessageStore
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}
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type PartSwitcher struct {
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ui.Invalidatable
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parts []*PartViewer
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selected int
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}
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func formatAddresses(addrs []*imap.Address) string {
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val := bytes.Buffer{}
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for i, addr := range addrs {
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if addr.PersonalName != "" {
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val.WriteString(fmt.Sprintf("%s <%s@%s>",
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addr.PersonalName, addr.MailboxName, addr.HostName))
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} else {
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val.WriteString(fmt.Sprintf("%s@%s",
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addr.MailboxName, addr.HostName))
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}
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if i != len(addrs)-1 {
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val.WriteString(", ")
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}
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}
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return val.String()
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}
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func NewMessageViewer(acct *AccountView, conf *config.AercConfig,
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store *lib.MessageStore, msg *types.MessageInfo) *MessageViewer {
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grid := ui.NewGrid().Rows([]ui.GridSpec{
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{ui.SIZE_EXACT, 3}, // TODO: Based on number of header rows
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{ui.SIZE_WEIGHT, 1},
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}).Columns([]ui.GridSpec{
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{ui.SIZE_WEIGHT, 1},
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})
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// TODO: let user specify additional headers to show by default
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headers := ui.NewGrid().Rows([]ui.GridSpec{
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{ui.SIZE_EXACT, 1},
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{ui.SIZE_EXACT, 1},
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{ui.SIZE_EXACT, 1},
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}).Columns([]ui.GridSpec{
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{ui.SIZE_WEIGHT, 1},
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{ui.SIZE_WEIGHT, 1},
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})
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headers.AddChild(
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&HeaderView{
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Name: "From",
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Value: formatAddresses(msg.Envelope.From),
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}).At(0, 0)
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headers.AddChild(
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&HeaderView{
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Name: "To",
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Value: formatAddresses(msg.Envelope.To),
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}).At(0, 1)
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headers.AddChild(
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&HeaderView{
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Name: "Subject",
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Value: msg.Envelope.Subject,
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}).At(1, 0).Span(1, 2)
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headers.AddChild(ui.NewFill(' ')).At(2, 0).Span(1, 2)
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var err error
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switcher := &PartSwitcher{}
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if len(msg.BodyStructure.Parts) == 0 {
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pv, err := NewPartViewer(conf, store, msg, msg.BodyStructure, []int{1})
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if err != nil {
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goto handle_error
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}
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switcher.parts = []*PartViewer{pv}
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pv.OnInvalidate(func(_ ui.Drawable) {
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switcher.Invalidate()
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})
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} else {
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switcher.parts, err = enumerateParts(conf, store,
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msg, msg.BodyStructure, []int{})
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if err != nil {
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goto handle_error
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}
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switcher.selected = -1
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for i, pv := range switcher.parts {
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pv.OnInvalidate(func(_ ui.Drawable) {
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switcher.Invalidate()
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})
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// TODO: switch to user's preferred mimetype, if configured
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if switcher.selected == -1 && pv.part.MIMEType != "multipart" {
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switcher.selected = i
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}
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}
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}
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grid.AddChild(headers).At(0, 0)
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grid.AddChild(switcher).At(1, 0)
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return &MessageViewer{
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acct: acct,
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grid: grid,
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msg: msg,
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store: store,
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switcher: switcher,
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}
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handle_error:
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return &MessageViewer{
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err: err,
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grid: grid,
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msg: msg,
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}
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}
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func enumerateParts(conf *config.AercConfig, store *lib.MessageStore,
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msg *types.MessageInfo, body *imap.BodyStructure,
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index []int) ([]*PartViewer, error) {
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var parts []*PartViewer
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for i, part := range body.Parts {
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curindex := append(index, i+1)
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if part.MIMEType == "multipart" {
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// Multipart meta-parts are faked
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pv := &PartViewer{part: part}
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parts = append(parts, pv)
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subParts, err := enumerateParts(
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conf, store, msg, part, curindex)
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if err != nil {
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return nil, err
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}
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parts = append(parts, subParts...)
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continue
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}
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pv, err := NewPartViewer(conf, store, msg, part, curindex)
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if err != nil {
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return nil, err
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}
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parts = append(parts, pv)
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}
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return parts, nil
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}
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func (mv *MessageViewer) Draw(ctx *ui.Context) {
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if mv.err != nil {
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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ctx.Printf(0, 0, tcell.StyleDefault, "%s", mv.err.Error())
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return
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}
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mv.grid.Draw(ctx)
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}
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func (mv *MessageViewer) Invalidate() {
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mv.grid.Invalidate()
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}
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func (mv *MessageViewer) OnInvalidate(fn func(d ui.Drawable)) {
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mv.grid.OnInvalidate(func(_ ui.Drawable) {
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fn(mv)
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})
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}
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func (mv *MessageViewer) Store() *lib.MessageStore {
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return mv.store
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}
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func (mv *MessageViewer) SelectedAccount() *AccountView {
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return mv.acct
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}
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func (mv *MessageViewer) SelectedMessage() *types.MessageInfo {
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return mv.msg
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}
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func (mv *MessageViewer) CurrentPart() *PartInfo {
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switcher := mv.switcher
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part := switcher.parts[switcher.selected]
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return &PartInfo{
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Index: part.index,
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Msg: part.msg,
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Part: part.part,
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Store: part.store,
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}
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}
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func (mv *MessageViewer) PreviousPart() {
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switcher := mv.switcher
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for {
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switcher.selected--
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if switcher.selected < 0 {
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switcher.selected = len(switcher.parts) - 1
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}
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if switcher.parts[switcher.selected].part.MIMEType != "multipart" {
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break
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}
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}
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mv.Invalidate()
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}
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func (mv *MessageViewer) NextPart() {
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switcher := mv.switcher
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for {
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switcher.selected++
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if switcher.selected >= len(switcher.parts) {
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switcher.selected = 0
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}
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if switcher.parts[switcher.selected].part.MIMEType != "multipart" {
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break
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}
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}
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mv.Invalidate()
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}
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func (ps *PartSwitcher) Invalidate() {
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ps.DoInvalidate(ps)
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}
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func (ps *PartSwitcher) Focus(focus bool) {
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if ps.parts[ps.selected].term != nil {
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ps.parts[ps.selected].term.Focus(focus)
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}
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}
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func (ps *PartSwitcher) Event(event tcell.Event) bool {
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if ps.parts[ps.selected].term != nil {
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return ps.parts[ps.selected].term.Event(event)
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}
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return false
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}
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func (ps *PartSwitcher) Draw(ctx *ui.Context) {
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height := len(ps.parts)
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if height == 1 {
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ps.parts[ps.selected].Draw(ctx)
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return
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}
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// TODO: cap height and add scrolling for messages with many parts
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y := ctx.Height() - height
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for i, part := range ps.parts {
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style := tcell.StyleDefault.Reverse(ps.selected == i)
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ctx.Fill(0, y+i, ctx.Width(), 1, ' ', style)
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name := fmt.Sprintf("%s/%s",
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strings.ToLower(part.part.MIMEType),
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strings.ToLower(part.part.MIMESubType))
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if filename, ok := part.part.DispositionParams["filename"]; ok {
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name += fmt.Sprintf(" (%s)", filename)
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}
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ctx.Printf(len(part.index)*2, y+i, style, "%s", name)
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}
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ps.parts[ps.selected].Draw(ctx.Subcontext(
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0, 0, ctx.Width(), ctx.Height()-height))
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}
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func (mv *MessageViewer) Event(event tcell.Event) bool {
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return mv.switcher.Event(event)
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}
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func (mv *MessageViewer) Focus(focus bool) {
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mv.switcher.Focus(focus)
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}
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type PartViewer struct {
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ui.Invalidatable
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err error
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fetched bool
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filter *exec.Cmd
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index []int
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msg *types.MessageInfo
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pager *exec.Cmd
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pagerin io.WriteCloser
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part *imap.BodyStructure
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sink io.WriteCloser
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source io.Reader
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store *lib.MessageStore
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term *Terminal
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}
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type PartInfo struct {
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Index []int
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Msg *types.MessageInfo
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Part *imap.BodyStructure
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Store *lib.MessageStore
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}
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func NewPartViewer(conf *config.AercConfig,
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store *lib.MessageStore, msg *types.MessageInfo,
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part *imap.BodyStructure, index []int) (*PartViewer, error) {
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var (
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filter *exec.Cmd
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pager *exec.Cmd
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pipe io.WriteCloser
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pagerin io.WriteCloser
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term *Terminal
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)
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cmd, err := shlex.Split(conf.Viewer.Pager)
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if err != nil {
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return nil, err
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}
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pager = exec.Command(cmd[0], cmd[1:]...)
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for _, f := range conf.Filters {
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mime := strings.ToLower(part.MIMEType) +
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"/" + strings.ToLower(part.MIMESubType)
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switch f.FilterType {
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case config.FILTER_MIMETYPE:
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if fnmatch.Match(f.Filter, mime, 0) {
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filter = exec.Command("sh", "-c", f.Command)
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}
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case config.FILTER_HEADER:
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var header string
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switch f.Header {
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case "subject":
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header = msg.Envelope.Subject
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case "from":
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header = formatAddresses(msg.Envelope.From)
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case "to":
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header = formatAddresses(msg.Envelope.To)
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case "cc":
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header = formatAddresses(msg.Envelope.Cc)
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}
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if f.Regex.Match([]byte(header)) {
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filter = exec.Command("sh", "-c", f.Command)
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}
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}
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if filter != nil {
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break
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}
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}
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if filter != nil {
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if pipe, err = filter.StdinPipe(); err != nil {
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return nil, err
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}
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if pagerin, _ = pager.StdinPipe(); err != nil {
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return nil, err
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}
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if term, err = NewTerminal(pager); err != nil {
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return nil, err
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}
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}
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pv := &PartViewer{
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filter: filter,
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index: index,
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msg: msg,
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pager: pager,
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pagerin: pagerin,
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part: part,
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sink: pipe,
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store: store,
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term: term,
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}
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if term != nil {
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term.OnStart = func() {
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pv.attemptCopy()
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}
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term.OnInvalidate(func(_ ui.Drawable) {
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pv.Invalidate()
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})
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}
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return pv, nil
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}
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func (pv *PartViewer) SetSource(reader io.Reader) {
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pv.source = reader
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pv.attemptCopy()
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}
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func (pv *PartViewer) attemptCopy() {
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if pv.source != nil && pv.pager.Process != nil {
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header := message.Header{}
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header.SetText("Content-Transfer-Encoding", pv.part.Encoding)
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header.SetContentType(pv.part.MIMEType, pv.part.Params)
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header.SetText("Content-Description", pv.part.Description)
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if pv.filter != nil {
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stdout, _ := pv.filter.StdoutPipe()
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stderr, _ := pv.filter.StderrPipe()
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pv.filter.Start()
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ch := make(chan interface{})
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go func() {
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_, err := io.Copy(pv.pagerin, stdout)
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if err != nil {
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pv.err = err
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pv.Invalidate()
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}
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stdout.Close()
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ch <- nil
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}()
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go func() {
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_, err := io.Copy(pv.pagerin, stderr)
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if err != nil {
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pv.err = err
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pv.Invalidate()
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}
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stderr.Close()
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ch <- nil
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}()
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go func() {
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<-ch
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<-ch
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pv.pagerin.Close()
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}()
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}
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go func() {
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entity, err := message.New(header, pv.source)
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if err != nil {
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pv.err = err
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pv.Invalidate()
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return
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}
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reader := mail.NewReader(entity)
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part, err := reader.NextPart()
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if err != nil {
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pv.err = err
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pv.Invalidate()
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return
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}
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io.Copy(pv.sink, part.Body)
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pv.sink.Close()
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}()
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}
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}
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func (pv *PartViewer) Invalidate() {
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pv.DoInvalidate(pv)
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}
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func (pv *PartViewer) Draw(ctx *ui.Context) {
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if pv.filter == nil {
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// TODO: Let them download it directly or something
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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ctx.Printf(0, 0, tcell.StyleDefault.Foreground(tcell.ColorRed),
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"No filter configured for this mimetype")
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return
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}
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if !pv.fetched {
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pv.store.FetchBodyPart(pv.msg.Uid, pv.index, pv.SetSource)
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pv.fetched = true
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}
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if pv.err != nil {
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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ctx.Printf(0, 0, tcell.StyleDefault, "%s", pv.err.Error())
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return
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}
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pv.term.Draw(ctx)
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}
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type HeaderView struct {
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ui.Invalidatable
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Name string
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Value string
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}
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func (hv *HeaderView) Draw(ctx *ui.Context) {
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name := hv.Name
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size := runewidth.StringWidth(name)
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lim := ctx.Width() - size - 1
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value := runewidth.Truncate(" "+hv.Value, lim, "…")
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var (
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hstyle tcell.Style
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vstyle tcell.Style
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)
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// TODO: Make this more robust and less dumb
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if hv.Name == "PGP" {
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vstyle = tcell.StyleDefault.Foreground(tcell.ColorGreen)
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hstyle = tcell.StyleDefault.Bold(true)
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} else {
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vstyle = tcell.StyleDefault
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hstyle = tcell.StyleDefault.Bold(true)
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}
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', vstyle)
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ctx.Printf(0, 0, hstyle, name)
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ctx.Printf(size, 0, vstyle, value)
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}
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func (hv *HeaderView) Invalidate() {
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hv.DoInvalidate(hv)
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}
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