package widgets
import (
"bytes"
"fmt"
"io"
"os/exec"
"strings"
"github.com/danwakefield/fnmatch"
"github.com/emersion/go-imap"
"github.com/emersion/go-message"
_ "github.com/emersion/go-message/charset"
"github.com/emersion/go-message/mail"
"github.com/gdamore/tcell"
"github.com/google/shlex"
"github.com/mattn/go-runewidth"
"git.sr.ht/~sircmpwn/aerc2/config"
"git.sr.ht/~sircmpwn/aerc2/lib"
"git.sr.ht/~sircmpwn/aerc2/lib/ui"
"git.sr.ht/~sircmpwn/aerc2/worker/types"
)
type MessageViewer struct {
conf *config.AercConfig
err error
filter *exec.Cmd
msg *types.MessageInfo
pager *exec.Cmd
source io.Reader
pagerin io.WriteCloser
sink io.WriteCloser
grid *ui.Grid
term *Terminal
}
func formatAddresses(addrs []*imap.Address) string {
val := bytes.Buffer{}
for i, addr := range addrs {
if addr.PersonalName != "" {
val.WriteString(fmt.Sprintf("%s <%s@%s>",
addr.PersonalName, addr.MailboxName, addr.HostName))
} else {
val.WriteString(fmt.Sprintf("%s@%s",
addr.MailboxName, addr.HostName))
}
if i != len(addrs)-1 {
val.WriteString(", ")
}
}
return val.String()
}
func NewMessageViewer(conf *config.AercConfig, store *lib.MessageStore,
msg *types.MessageInfo) *MessageViewer {
grid := ui.NewGrid().Rows([]ui.GridSpec{
{ui.SIZE_EXACT, 3}, // TODO: Based on number of header rows
{ui.SIZE_WEIGHT, 1},
}).Columns([]ui.GridSpec{
{ui.SIZE_WEIGHT, 1},
})
// TODO: let user specify additional headers to show by default
headers := ui.NewGrid().Rows([]ui.GridSpec{
{ui.SIZE_EXACT, 1},
{ui.SIZE_EXACT, 1},
{ui.SIZE_EXACT, 1},
}).Columns([]ui.GridSpec{
{ui.SIZE_WEIGHT, 1},
{ui.SIZE_WEIGHT, 1},
})
headers.AddChild(
&HeaderView{
Name: "From",
Value: formatAddresses(msg.Envelope.From),
}).At(0, 0)
headers.AddChild(
&HeaderView{
Name: "To",
Value: formatAddresses(msg.Envelope.To),
}).At(0, 1)
headers.AddChild(
&HeaderView{
Name: "Subject",
Value: msg.Envelope.Subject,
}).At(1, 0).Span(1, 2)
headers.AddChild(ui.NewFill(' ')).At(2, 0).Span(1, 2)
body := ui.NewGrid().Rows([]ui.GridSpec{
{ui.SIZE_WEIGHT, 1},
}).Columns([]ui.GridSpec{
{ui.SIZE_WEIGHT, 1},
{ui.SIZE_EXACT, 20},
})
var (
filter *exec.Cmd
pager *exec.Cmd
pipe io.WriteCloser
pagerin io.WriteCloser
term *Terminal
viewer *MessageViewer
)
cmd, err := shlex.Split(conf.Viewer.Pager)
if err != nil {
goto handle_error
}
pager = exec.Command(cmd[0], cmd[1:]...)
for _, f := range conf.Filters {
mime := strings.ToLower(msg.BodyStructure.MIMEType) +
"/" + strings.ToLower(msg.BodyStructure.MIMESubType)
switch f.FilterType {
case config.FILTER_MIMETYPE:
if fnmatch.Match(f.Filter, mime, 0) {
filter = exec.Command("sh", "-c", f.Command)
}
case config.FILTER_HEADER:
var header string
switch f.Header {
case "subject":
header = msg.Envelope.Subject
case "from":
header = formatAddresses(msg.Envelope.From)
case "to":
header = formatAddresses(msg.Envelope.To)
case "cc":
header = formatAddresses(msg.Envelope.Cc)
}
if f.Regex.Match([]byte(header)) {
filter = exec.Command("sh", "-c", f.Command)
}
}
if filter != nil {
break
}
}
if filter != nil {
pipe, _ = filter.StdinPipe()
pagerin, _ = pager.StdinPipe()
} else {
pipe, _ = pager.StdinPipe()
}
term, _ = NewTerminal(pager)
// TODO: configure multipart view. I left a spot for it in the grid
body.AddChild(term).At(0, 0).Span(1, 2)
grid.AddChild(headers).At(0, 0)
grid.AddChild(body).At(1, 0)
viewer = &MessageViewer{
filter: filter,
grid: grid,
msg: msg,
pager: pager,
pagerin: pagerin,
sink: pipe,
term: term,
}
store.FetchBodyPart(msg.Uid, 0, func(reader io.Reader) {
viewer.source = reader
viewer.attemptCopy()
})
term.OnStart = func() {
viewer.attemptCopy()
}
return viewer
handle_error:
viewer = &MessageViewer{
err: err,
grid: grid,
msg: msg,
}
return viewer
}
func (mv *MessageViewer) attemptCopy() {
if mv.source != nil && mv.pager.Process != nil {
header := message.Header{}
header.SetText("Content-Transfer-Encoding",
mv.msg.BodyStructure.Encoding)
header.SetContentType(
mv.msg.BodyStructure.MIMEType, mv.msg.BodyStructure.Params)
header.SetText("Content-Description", mv.msg.BodyStructure.Description)
if mv.filter != nil {
stdout, _ := mv.filter.StdoutPipe()
mv.filter.Start()
go func() {
_, err := io.Copy(mv.pagerin, stdout)
if err != nil {
mv.err = err
mv.Invalidate()
}
mv.pagerin.Close()
stdout.Close()
}()
}
go func() {
entity, err := message.New(header, mv.source)
if err != nil {
mv.err = err
mv.Invalidate()
return
}
reader := mail.NewReader(entity)
part, err := reader.NextPart()
if err != nil {
mv.err = err
mv.Invalidate()
return
}
io.Copy(mv.sink, part.Body)
mv.sink.Close()
}()
}
}
func (mv *MessageViewer) Draw(ctx *ui.Context) {
if mv.err != nil {
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
ctx.Printf(0, 0, tcell.StyleDefault, "%s", mv.err.Error())
return
}
mv.grid.Draw(ctx)
}
func (mv *MessageViewer) Invalidate() {
mv.grid.Invalidate()
}
func (mv *MessageViewer) OnInvalidate(fn func(d ui.Drawable)) {
mv.grid.OnInvalidate(func(_ ui.Drawable) {
fn(mv)
})
}
func (mv *MessageViewer) Event(event tcell.Event) bool {
if mv.term != nil {
return mv.term.Event(event)
}
return false
}
func (mv *MessageViewer) Focus(focus bool) {
if mv.term != nil {
mv.term.Focus(focus)
}
}
type HeaderView struct {
ui.Invalidatable
Name string
Value string
}
func (hv *HeaderView) Draw(ctx *ui.Context) {
name := hv.Name
size := runewidth.StringWidth(name)
lim := ctx.Width() - size - 1
value := runewidth.Truncate(" "+hv.Value, lim, "…")
var (
hstyle tcell.Style
vstyle tcell.Style
)
// TODO: Make this more robust and less dumb
if hv.Name == "PGP" {
vstyle = tcell.StyleDefault.Foreground(tcell.ColorGreen)
hstyle = tcell.StyleDefault.Bold(true)
} else {
vstyle = tcell.StyleDefault
hstyle = tcell.StyleDefault.Bold(true)
}
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', vstyle)
ctx.Printf(0, 0, hstyle, name)
ctx.Printf(size, 0, vstyle, value)
}
func (hv *HeaderView) Invalidate() {
hv.DoInvalidate(hv)
}
type MultipartView struct {
ui.Invalidatable
}
func (mpv *MultipartView) Draw(ctx *ui.Context) {
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
ctx.Fill(0, 0, ctx.Width(), 1, ' ', tcell.StyleDefault.Reverse(true))
ctx.Printf(0, 0, tcell.StyleDefault.Reverse(true), "text/plain")
ctx.Printf(0, 1, tcell.StyleDefault, "text/html")
ctx.Printf(0, 2, tcell.StyleDefault, "application/pgp-si…")
}
func (mpv *MultipartView) Invalidate() {
mpv.DoInvalidate(mpv)
}