ref: 1b673b5ea7d06ef914e9d48ff7299f8b5f2119fd aerc/widgets/msgviewer.go -rw-r--r-- 13.6 KiB View raw
                                                                                
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package widgets

import (
	"bufio"
	"errors"
	"fmt"
	"io"
	"os/exec"
	"regexp"
	"strings"

	"github.com/danwakefield/fnmatch"
	"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/aerc/config"
	"git.sr.ht/~sircmpwn/aerc/lib"
	"git.sr.ht/~sircmpwn/aerc/lib/ui"
	"git.sr.ht/~sircmpwn/aerc/models"
)

var ansi = regexp.MustCompile("^\x1B\\[[0-?]*[ -/]*[@-~]")

type MessageViewer struct {
	ui.Invalidatable
	acct     *AccountView
	conf     *config.AercConfig
	err      error
	grid     *ui.Grid
	msg      *models.MessageInfo
	switcher *PartSwitcher
	store    *lib.MessageStore
}

type PartSwitcher struct {
	ui.Invalidatable
	parts          []*PartViewer
	selected       int
	showHeaders    bool
	alwaysShowMime bool
}

func NewMessageViewer(acct *AccountView, conf *config.AercConfig,
2 references
store *lib.MessageStore, msg *models.MessageInfo) *MessageViewer { header, headerHeight := createHeader(msg, conf.Viewer.HeaderLayout) grid := ui.NewGrid().Rows([]ui.GridSpec{ {ui.SIZE_EXACT, headerHeight}, {ui.SIZE_WEIGHT, 1}, }).Columns([]ui.GridSpec{ {ui.SIZE_WEIGHT, 1}, }) switcher := &PartSwitcher{} err := createSwitcher(switcher, conf, store, msg) if err != nil { return &MessageViewer{ err: err, grid: grid, msg: msg, } } grid.AddChild(header).At(0, 0) grid.AddChild(switcher).At(1, 0) return &MessageViewer{ acct: acct, conf: conf, grid: grid, msg: msg, store: store, switcher: switcher, } } func createHeader(msg *models.MessageInfo, layout [][]string) (grid *ui.Grid, height int) {
1 reference
presentHeaders := presentHeaders(msg, layout) rowCount := len(presentHeaders) + 1 // extra row for spacer grid = ui.MakeGrid(rowCount, 1, ui.SIZE_EXACT, ui.SIZE_WEIGHT) for i, cols := range presentHeaders { r := ui.MakeGrid(1, len(cols), ui.SIZE_EXACT, ui.SIZE_WEIGHT) for j, col := range cols { r.AddChild( &HeaderView{ Name: col, Value: fmtHeader(msg, col), }).At(0, j) } grid.AddChild(r).At(i, 0) } grid.AddChild(ui.NewFill(' ')).At(rowCount-1, 0) return grid, rowCount } // presentHeaders returns a filtered header layout, removing rows whose headers // do not appear in the provided message. func presentHeaders(msg *models.MessageInfo, layout [][]string) [][]string {
1 reference
headers := msg.RFC822Headers result := make([][]string, 0, len(layout)) for _, row := range layout { // To preserve layout alignment, only hide rows if all columns are empty for _, col := range row { if headers.Get(col) != "" { result = append(result, row) break } } } return result } func fmtHeader(msg *models.MessageInfo, header string) string {
1 reference
switch header { case "From": return models.FormatAddresses(msg.Envelope.From) case "To": return models.FormatAddresses(msg.Envelope.To) case "Cc": return models.FormatAddresses(msg.Envelope.Cc) case "Bcc": return models.FormatAddresses(msg.Envelope.Bcc) case "Date": return msg.Envelope.Date.Format("Mon Jan 2, 2006 at 3:04 PM") case "Subject": return msg.Envelope.Subject default: return msg.RFC822Headers.Get(header) } } func enumerateParts(conf *config.AercConfig, store *lib.MessageStore,
2 references
msg *models.MessageInfo, body *models.BodyStructure, index []int) ([]*PartViewer, error) { var parts []*PartViewer for i, part := range body.Parts { curindex := append(index, i+1) if part.MIMEType == "multipart" { // Multipart meta-parts are faked pv := &PartViewer{part: part} parts = append(parts, pv) subParts, err := enumerateParts( conf, store, msg, part, curindex) if err != nil { return nil, err } parts = append(parts, subParts...) continue } pv, err := NewPartViewer(conf, store, msg, part, curindex) if err != nil { return nil, err } parts = append(parts, pv) } return parts, nil } func createSwitcher(switcher *PartSwitcher, conf *config.AercConfig,
2 references
store *lib.MessageStore, msg *models.MessageInfo) error { var err error switcher.selected = -1 switcher.showHeaders = conf.Viewer.ShowHeaders switcher.alwaysShowMime = conf.Viewer.AlwaysShowMime if len(msg.BodyStructure.Parts) == 0 { switcher.selected = 0 pv, err := NewPartViewer(conf, store, msg, msg.BodyStructure, []int{1}) if err != nil { return err } switcher.parts = []*PartViewer{pv} pv.OnInvalidate(func(_ ui.Drawable) { switcher.Invalidate() }) } else { switcher.parts, err = enumerateParts(conf, store, msg, msg.BodyStructure, []int{}) if err != nil { return err } selectedPriority := -1 fmt.Printf("Selecting best message from %v\n", conf.Viewer.Alternatives) for i, pv := range switcher.parts { pv.OnInvalidate(func(_ ui.Drawable) { switcher.Invalidate() }) // Switch to user's preferred mimetype if switcher.selected == -1 && pv.part.MIMEType != "multipart" { switcher.selected = i } if selectedPriority == -1 { for idx, m := range conf.Viewer.Alternatives { if m != pv.part.MIMEType+"/"+pv.part.MIMESubType { continue } priority := len(conf.Viewer.Alternatives) - idx if priority > selectedPriority { selectedPriority = priority switcher.selected = i } } } } } return nil } 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() {
2 references
mv.grid.Invalidate() } func (mv *MessageViewer) OnInvalidate(fn func(d ui.Drawable)) { mv.grid.OnInvalidate(func(_ ui.Drawable) { fn(mv) }) } func (mv *MessageViewer) Store() *lib.MessageStore {
1 reference
return mv.store } func (mv *MessageViewer) SelectedAccount() *AccountView {
1 reference
return mv.acct } func (mv *MessageViewer) SelectedMessage() (*models.MessageInfo, error) { if mv.msg == nil { return nil, errors.New("no message selected") } return mv.msg, nil } func (mv *MessageViewer) ToggleHeaders() {
1 reference
switcher := mv.switcher mv.conf.Viewer.ShowHeaders = !mv.conf.Viewer.ShowHeaders err := createSwitcher( switcher, mv.conf, mv.store, mv.msg) if err != nil { mv.acct.Logger().Printf( "warning: error during create switcher - %v", err) } switcher.Invalidate() } func (mv *MessageViewer) SelectedMessagePart() *PartInfo {
2 references
switcher := mv.switcher part := switcher.parts[switcher.selected] return &PartInfo{ Index: part.index, Msg: part.msg, Part: part.part, Store: part.store, } } func (mv *MessageViewer) PreviousPart() {
1 reference
switcher := mv.switcher for { switcher.selected-- if switcher.selected < 0 { switcher.selected = len(switcher.parts) - 1 } if switcher.parts[switcher.selected].part.MIMEType != "multipart" { break } } mv.Invalidate() } func (mv *MessageViewer) NextPart() {
1 reference
switcher := mv.switcher for { switcher.selected++ if switcher.selected >= len(switcher.parts) { switcher.selected = 0 } if switcher.parts[switcher.selected].part.MIMEType != "multipart" { break } } mv.Invalidate() } func (ps *PartSwitcher) Invalidate() {
3 references
ps.DoInvalidate(ps) } func (ps *PartSwitcher) Focus(focus bool) {
1 reference
if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(focus) } } func (ps *PartSwitcher) Event(event tcell.Event) bool {
1 reference
if ps.parts[ps.selected].term != nil { return ps.parts[ps.selected].term.Event(event) } return false } func (ps *PartSwitcher) Draw(ctx *ui.Context) { height := len(ps.parts) if height == 1 && !ps.alwaysShowMime { ps.parts[ps.selected].Draw(ctx) return } // TODO: cap height and add scrolling for messages with many parts y := ctx.Height() - height for i, part := range ps.parts { style := tcell.StyleDefault.Reverse(ps.selected == i) ctx.Fill(0, y+i, ctx.Width(), 1, ' ', style) name := fmt.Sprintf("%s/%s", strings.ToLower(part.part.MIMEType), strings.ToLower(part.part.MIMESubType)) if filename, ok := part.part.DispositionParams["filename"]; ok { name += fmt.Sprintf(" (%s)", filename) } ctx.Printf(len(part.index)*2, y+i, style, "%s", name) } ps.parts[ps.selected].Draw(ctx.Subcontext( 0, 0, ctx.Width(), ctx.Height()-height)) } func (mv *MessageViewer) Event(event tcell.Event) bool { return mv.switcher.Event(event) } func (mv *MessageViewer) Focus(focus bool) { mv.switcher.Focus(focus) } type PartViewer struct { ui.Invalidatable err error fetched bool filter *exec.Cmd index []int msg *models.MessageInfo pager *exec.Cmd pagerin io.WriteCloser part *models.BodyStructure showHeaders bool sink io.WriteCloser source io.Reader store *lib.MessageStore term *Terminal } func NewPartViewer(conf *config.AercConfig,
2 references
store *lib.MessageStore, msg *models.MessageInfo, part *models.BodyStructure, index []int) (*PartViewer, error) { var ( filter *exec.Cmd pager *exec.Cmd pipe io.WriteCloser pagerin io.WriteCloser term *Terminal ) cmd, err := shlex.Split(conf.Viewer.Pager) if err != nil { return nil, err } pager = exec.Command(cmd[0], cmd[1:]...) for _, f := range conf.Filters { mime := strings.ToLower(part.MIMEType) + "/" + strings.ToLower(part.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 = models.FormatAddresses(msg.Envelope.From) case "to": header = models.FormatAddresses(msg.Envelope.To) case "cc": header = models.FormatAddresses(msg.Envelope.Cc) } if f.Regex.Match([]byte(header)) { filter = exec.Command("sh", "-c", f.Command) } } if filter != nil { break } } if filter != nil { if pipe, err = filter.StdinPipe(); err != nil { return nil, err } if pagerin, _ = pager.StdinPipe(); err != nil { return nil, err } if term, err = NewTerminal(pager); err != nil { return nil, err } } pv := &PartViewer{ filter: filter, index: index, msg: msg, pager: pager, pagerin: pagerin, part: part, showHeaders: conf.Viewer.ShowHeaders, sink: pipe, store: store, term: term, } if term != nil { term.OnStart = func() { pv.attemptCopy() } term.OnInvalidate(func(_ ui.Drawable) { pv.Invalidate() }) } return pv, nil } func (pv *PartViewer) SetSource(reader io.Reader) {
1 reference
pv.source = reader pv.attemptCopy() } func (pv *PartViewer) attemptCopy() {
2 references
if pv.source != nil && pv.pager.Process != nil { header := message.Header{} header.SetText("Content-Transfer-Encoding", pv.part.Encoding) header.SetContentType(pv.part.MIMEType, pv.part.Params) header.SetText("Content-Description", pv.part.Description) if pv.filter != nil { stdout, _ := pv.filter.StdoutPipe() stderr, _ := pv.filter.StderrPipe() pv.filter.Start() ch := make(chan interface{}) go func() { _, err := io.Copy(pv.pagerin, stdout) if err != nil { pv.err = err pv.Invalidate() } stdout.Close() ch <- nil }() go func() { _, err := io.Copy(pv.pagerin, stderr) if err != nil { pv.err = err pv.Invalidate() } stderr.Close() ch <- nil }() go func() { <-ch <-ch pv.pagerin.Close() }() } go func() { if pv.showHeaders && pv.msg.RFC822Headers != nil { fields := pv.msg.RFC822Headers.Fields() for fields.Next() { field := fmt.Sprintf( "%s: %s\n", fields.Key(), fields.Value()) pv.sink.Write([]byte(field)) } pv.sink.Write([]byte{'\n'}) } entity, err := message.New(header, pv.source) if err != nil { pv.err = err pv.Invalidate() return } reader := mail.NewReader(entity) part, err := reader.NextPart() if err != nil { pv.err = err pv.Invalidate() return } if pv.part.MIMEType == "text" { scanner := bufio.NewScanner(part.Body) for scanner.Scan() { text := scanner.Text() text = ansi.ReplaceAllString(text, "") io.WriteString(pv.sink, text+"\n") } } else { io.Copy(pv.sink, part.Body) } pv.sink.Close() }() } } func (pv *PartViewer) Invalidate() {
5 references
pv.DoInvalidate(pv) } func (pv *PartViewer) Draw(ctx *ui.Context) {
2 references
if pv.filter == nil { // TODO: Let them download it directly or something ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault) ctx.Printf(0, 0, tcell.StyleDefault.Foreground(tcell.ColorRed), "No filter configured for this mimetype") return } if !pv.fetched { pv.store.FetchBodyPart(pv.msg.Uid, pv.index, pv.SetSource) pv.fetched = true } if pv.err != nil { ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault) ctx.Printf(0, 0, tcell.StyleDefault, "%s", pv.err.Error()) return } pv.term.Draw(ctx) } 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) }