304 lines
6.7 KiB
Go
304 lines
6.7 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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conf *config.AercConfig
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err error
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filter *exec.Cmd
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msg *types.MessageInfo
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pager *exec.Cmd
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source io.Reader
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pagerin io.WriteCloser
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sink io.WriteCloser
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grid *ui.Grid
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term *Terminal
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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(conf *config.AercConfig, store *lib.MessageStore,
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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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body := ui.NewGrid().Rows([]ui.GridSpec{
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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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{ui.SIZE_EXACT, 20},
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})
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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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viewer *MessageViewer
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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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goto handle_error
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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(msg.BodyStructure.MIMEType) +
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"/" + strings.ToLower(msg.BodyStructure.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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pipe, _ = filter.StdinPipe()
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pagerin, _ = pager.StdinPipe()
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} else {
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pipe, _ = pager.StdinPipe()
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}
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term, _ = NewTerminal(pager)
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// TODO: configure multipart view. I left a spot for it in the grid
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body.AddChild(term).At(0, 0).Span(1, 2)
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grid.AddChild(headers).At(0, 0)
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grid.AddChild(body).At(1, 0)
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viewer = &MessageViewer{
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filter: filter,
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grid: grid,
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msg: msg,
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pager: pager,
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pagerin: pagerin,
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sink: pipe,
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term: term,
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}
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store.FetchBodyPart(msg.Uid, 0, func(reader io.Reader) {
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viewer.source = reader
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viewer.attemptCopy()
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})
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term.OnStart = func() {
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viewer.attemptCopy()
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}
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return viewer
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handle_error:
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viewer = &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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return viewer
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}
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func (mv *MessageViewer) attemptCopy() {
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if mv.source != nil && mv.pager.Process != nil {
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header := message.Header{}
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header.SetText("Content-Transfer-Encoding",
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mv.msg.BodyStructure.Encoding)
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header.SetContentType(
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mv.msg.BodyStructure.MIMEType, mv.msg.BodyStructure.Params)
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header.SetText("Content-Description", mv.msg.BodyStructure.Description)
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if mv.filter != nil {
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stdout, _ := mv.filter.StdoutPipe()
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mv.filter.Start()
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go func() {
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_, err := io.Copy(mv.pagerin, stdout)
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if err != nil {
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mv.err = err
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mv.Invalidate()
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}
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mv.pagerin.Close()
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stdout.Close()
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}()
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}
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go func() {
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entity, err := message.New(header, mv.source)
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if err != nil {
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mv.err = err
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mv.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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mv.err = err
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mv.Invalidate()
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return
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}
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io.Copy(mv.sink, part.Body)
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mv.sink.Close()
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}()
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}
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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) Event(event tcell.Event) bool {
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if mv.term != nil {
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return mv.term.Event(event)
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}
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return false
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}
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func (mv *MessageViewer) Focus(focus bool) {
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if mv.term != nil {
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mv.term.Focus(focus)
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}
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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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type MultipartView struct {
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ui.Invalidatable
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}
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func (mpv *MultipartView) Draw(ctx *ui.Context) {
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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ctx.Fill(0, 0, ctx.Width(), 1, ' ', tcell.StyleDefault.Reverse(true))
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ctx.Printf(0, 0, tcell.StyleDefault.Reverse(true), "text/plain")
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ctx.Printf(0, 1, tcell.StyleDefault, "text/html")
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ctx.Printf(0, 2, tcell.StyleDefault, "application/pgp-si…")
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}
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func (mpv *MultipartView) Invalidate() {
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mpv.DoInvalidate(mpv)
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}
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