~sircmpwn/aerc

aerc/widgets/compose.go -rw-r--r-- 19.2 KiB
743683a0y0ast update go-imap-sortthread 16 days ago
                                                                                
0ceea027 Kevin Kuehler
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
3338dce8 Greg Anders
59df06fe Stefan Rakel
3338dce8 Greg Anders
3338dce8 Greg Anders
0ceea027 Kevin Kuehler
0ceea027 Kevin Kuehler
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
3338dce8 Greg Anders
3338dce8 Greg Anders
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
905cb9df Kalyan Sriram
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package widgets

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"mime"
	"net/http"
	gomail "net/mail"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"

	"github.com/emersion/go-message/mail"
	"github.com/gdamore/tcell"
	"github.com/mattn/go-runewidth"
	"github.com/mitchellh/go-homedir"
	"github.com/pkg/errors"

	"git.sr.ht/~sircmpwn/aerc/completer"
	"git.sr.ht/~sircmpwn/aerc/config"
	"git.sr.ht/~sircmpwn/aerc/lib/templates"
	"git.sr.ht/~sircmpwn/aerc/lib/ui"
	"git.sr.ht/~sircmpwn/aerc/models"
	"git.sr.ht/~sircmpwn/aerc/worker/types"
)

type Composer struct {
	editors map[string]*headerEditor

	acctConfig *config.AccountConfig
	config     *config.AercConfig
	acct       *AccountView
	aerc       *Aerc

	attachments []string
	date        time.Time
	defaults    map[string]string
	editor      *Terminal
	email       *os.File
	grid        *ui.Grid
	header      *ui.Grid
	msgId       string
	review      *reviewMessage
	worker      *types.Worker
	completer   *completer.Completer

	layout    HeaderLayout
	focusable []ui.MouseableDrawableInteractive
	focused   int
	sent      bool

	onClose []func(ti *Composer)

	width int
}

func NewComposer(aerc *Aerc, acct *AccountView, conf *config.AercConfig,
	acctConfig *config.AccountConfig, worker *types.Worker, template string,
	defaults map[string]string, original models.OriginalMail) (*Composer, error) {

	if defaults == nil {
		defaults = make(map[string]string)
	}
	if from := defaults["From"]; from == "" {
		defaults["From"] = acctConfig.From
	}

	templateData := templates.ParseTemplateData(defaults, original)
	cmpl := completer.New(conf.Compose.AddressBookCmd, func(err error) {
		aerc.PushError(
			fmt.Sprintf("could not complete header: %v", err))
		worker.Logger.Printf("could not complete header: %v", err)
	}, aerc.Logger())
	layout, editors, focusable := buildComposeHeader(aerc, cmpl, defaults)

	email, err := ioutil.TempFile("", "aerc-compose-*.eml")
	if err != nil {
		// TODO: handle this better
		return nil, err
	}

	c := &Composer{
		acct:       acct,
		acctConfig: acctConfig,
		aerc:       aerc,
		config:     conf,
		date:       time.Now(),
		defaults:   defaults,
		editors:    editors,
		email:      email,
		layout:     layout,
		msgId:      mail.GenerateMessageID(),
		worker:     worker,
		// You have to backtab to get to "From", since you usually don't edit it
		focused:   1,
		focusable: focusable,
		completer: cmpl,
	}

	if err := c.AddTemplate(template, templateData); err != nil {
		return nil, err
	}
	c.AddSignature()

	c.updateGrid()
	c.ShowTerminal()

	return c, nil
}

func buildComposeHeader(aerc *Aerc, cmpl *completer.Completer,
	defaults map[string]string) (
	newLayout HeaderLayout,
	editors map[string]*headerEditor,
	focusable []ui.MouseableDrawableInteractive,
) {
	layout := aerc.conf.Compose.HeaderLayout
	editors = make(map[string]*headerEditor)
	focusable = make([]ui.MouseableDrawableInteractive, 0)

	for _, row := range layout {
		for _, h := range row {
			e := newHeaderEditor(h, "", aerc.SelectedAccount().UiConfig())
			if aerc.conf.Ui.CompletionPopovers {
				e.input.TabComplete(cmpl.ForHeader(h), aerc.SelectedAccount().UiConfig().CompletionDelay)
			}
			editors[h] = e
			switch h {
			case "From":
				// Prepend From to support backtab
				focusable = append([]ui.MouseableDrawableInteractive{e}, focusable...)
			default:
				focusable = append(focusable, e)
			}
		}
	}

	// Add Cc/Bcc editors to layout if in defaults and not already visible
	for _, h := range []string{"Cc", "Bcc"} {
		if val, ok := defaults[h]; ok && val != "" {
			if _, ok := editors[h]; !ok {
				e := newHeaderEditor(h, "", aerc.SelectedAccount().UiConfig())
				if aerc.conf.Ui.CompletionPopovers {
					e.input.TabComplete(cmpl.ForHeader(h), aerc.SelectedAccount().UiConfig().CompletionDelay)
				}
				editors[h] = e
				focusable = append(focusable, e)
				layout = append(layout, []string{h})
			}
		}
	}

	// Set default values for all editors
	for key := range editors {
		if val, ok := defaults[key]; ok {
			editors[key].input.Set(val)
			delete(defaults, key)
		}
	}
	return layout, editors, focusable
}

func (c *Composer) SetSent() {
	c.sent = true
}

func (c *Composer) Sent() bool {
	return c.sent
}

// Note: this does not reload the editor. You must call this before the first
// Draw() call.
func (c *Composer) SetContents(reader io.Reader) *Composer {
	c.email.Seek(0, io.SeekStart)
	io.Copy(c.email, reader)
	c.email.Sync()
	c.email.Seek(0, io.SeekStart)
	return c
}

func (c *Composer) AppendContents(reader io.Reader) {
	c.email.Seek(0, io.SeekEnd)
	io.Copy(c.email, reader)
	c.email.Sync()
}

func (c *Composer) AddTemplate(template string, data interface{}) error {
	if template == "" {
		return nil
	}

	templateText, err := templates.ParseTemplateFromFile(
		template, c.config.Templates.TemplateDirs, data)
	if err != nil {
		return err
	}

	mr, err := mail.CreateReader(templateText)
	if err != nil {
		return fmt.Errorf("Template loading failed: %v", err)
	}

	// add the headers contained in the template to the default headers
	hf := mr.Header.Fields()
	for hf.Next() {
		var val string
		var err error
		if val, err = hf.Text(); err != nil {
			val = hf.Value()
		}
		c.defaults[hf.Key()] = val
	}

	part, err := mr.NextPart()
	if err != nil {
		return fmt.Errorf("Could not get body of template: %v", err)
	}

	c.AppendContents(part.Body)
	return nil
}

func (c *Composer) AddSignature() {
	var signature []byte
	if c.acctConfig.SignatureCmd != "" {
		var err error
		signature, err = c.readSignatureFromCmd()
		if err != nil {
			signature = c.readSignatureFromFile()
		}
	} else {
		signature = c.readSignatureFromFile()
	}
	c.AppendContents(bytes.NewReader(signature))
}

func (c *Composer) readSignatureFromCmd() ([]byte, error) {
	sigCmd := c.acctConfig.SignatureCmd
	cmd := exec.Command("sh", "-c", sigCmd)
	signature, err := cmd.Output()
	if err != nil {
		return nil, err
	}
	return signature, nil
}

func (c *Composer) readSignatureFromFile() []byte {
	sigFile := c.acctConfig.SignatureFile
	if sigFile == "" {
		return nil
	}
	sigFile, err := homedir.Expand(sigFile)
	if err != nil {
		return nil
	}
	signature, err := ioutil.ReadFile(sigFile)
	if err != nil {
		c.aerc.PushError(
			fmt.Sprintf(" Error loading signature from file: %v", sigFile))
		return nil
	}
	return signature
}

func (c *Composer) FocusTerminal() *Composer {
	if c.editor == nil {
		return c
	}
	c.focusable[c.focused].Focus(false)
	c.focused = len(c.editors)
	c.focusable[c.focused].Focus(true)
	return c
}

func (c *Composer) FocusSubject() *Composer {
	c.focusable[c.focused].Focus(false)
	c.focused = 2
	c.focusable[c.focused].Focus(true)
	return c
}

func (c *Composer) FocusRecipient() *Composer {
	c.focusable[c.focused].Focus(false)
	c.focused = 1
	c.focusable[c.focused].Focus(true)
	return c
}

// OnHeaderChange registers an OnChange callback for the specified header.
func (c *Composer) OnHeaderChange(header string, fn func(subject string)) {
	if editor, ok := c.editors[header]; ok {
		editor.OnChange(func() {
			fn(editor.input.String())
		})
	}
}

func (c *Composer) OnClose(fn func(composer *Composer)) {
	c.onClose = append(c.onClose, fn)
}

func (c *Composer) Draw(ctx *ui.Context) {
	c.width = ctx.Width()
	c.grid.Draw(ctx)
}

func (c *Composer) Invalidate() {
	c.grid.Invalidate()
}

func (c *Composer) OnInvalidate(fn func(d ui.Drawable)) {
	c.grid.OnInvalidate(func(_ ui.Drawable) {
		fn(c)
	})
}

func (c *Composer) Close() {
	for _, onClose := range c.onClose {
		onClose(c)
	}
	if c.email != nil {
		path := c.email.Name()
		c.email.Close()
		os.Remove(path)
		c.email = nil
	}
	if c.editor != nil {
		c.editor.Destroy()
		c.editor = nil
	}
}

func (c *Composer) Bindings() string {
	if c.editor == nil {
		return "compose::review"
	} else if c.editor == c.focusable[c.focused] {
		return "compose::editor"
	} else {
		return "compose"
	}
}

func (c *Composer) Event(event tcell.Event) bool {
	if c.editor != nil {
		return c.focusable[c.focused].Event(event)
	}
	return false
}

func (c *Composer) MouseEvent(localX int, localY int, event tcell.Event) {
	c.grid.MouseEvent(localX, localY, event)
	for _, e := range c.focusable {
		he, ok := e.(*headerEditor)
		if ok && he.focused {
			c.FocusEditor(he)
		}
	}
}

func (c *Composer) Focus(focus bool) {
	c.focusable[c.focused].Focus(focus)
}

func (c *Composer) Config() *config.AccountConfig {
	return c.acctConfig
}

func (c *Composer) Account() *AccountView {
	return c.acct
}

func (c *Composer) Worker() *types.Worker {
	return c.worker
}

func (c *Composer) PrepareHeader() (*mail.Header, []string, error) {
	header := &mail.Header{}
	for h, val := range c.defaults {
		if val == "" {
			continue
		}
		header.SetText(h, val)
	}
	header.SetText("Message-Id", c.msgId)
	header.SetDate(c.date)

	headerKeys := make([]string, 0, len(c.editors))
	for key := range c.editors {
		headerKeys = append(headerKeys, key)
	}

	var rcpts []string
	for h, editor := range c.editors {
		val := editor.input.String()
		if val == "" {
			continue
		}
		switch h {
		case "From", "To", "Cc", "Bcc": // Address headers
			hdrRcpts, err := gomail.ParseAddressList(val)
			if err != nil {
				return nil, nil, errors.Wrapf(err, "ParseAddressList(%s)", val)
			}
			edRcpts := make([]*mail.Address, len(hdrRcpts))
			for i, addr := range hdrRcpts {
				edRcpts[i] = (*mail.Address)(addr)
			}
			header.SetAddressList(h, edRcpts)
			if h != "From" {
				for _, addr := range edRcpts {
					rcpts = append(rcpts, addr.Address)
				}
			}
		default:
			header.SetText(h, val)
		}
	}
	return header, rcpts, nil
}

func (c *Composer) WriteMessage(header *mail.Header, writer io.Writer) error {
	if err := c.reloadEmail(); err != nil {
		return err
	}

	if len(c.attachments) == 0 {
		// don't create a multipart email if we only have text
		return writeInlineBody(header, c.email, writer)
	}

	// otherwise create a multipart email,
	// with a multipart/alternative part for the text
	w, err := mail.CreateWriter(writer, *header)
	if err != nil {
		return errors.Wrap(err, "CreateWriter")
	}
	defer w.Close()

	if err := writeMultipartBody(c.email, w); err != nil {
		return errors.Wrap(err, "writeMultipartBody")
	}

	for _, a := range c.attachments {
		if err := writeAttachment(a, w); err != nil {
			return errors.Wrap(err, "writeAttachment")
		}
	}

	return nil
}

func writeInlineBody(header *mail.Header, body io.Reader, writer io.Writer) error {
	header.SetContentType("text/plain", map[string]string{"charset": "UTF-8"})
	w, err := mail.CreateSingleInlineWriter(writer, *header)
	if err != nil {
		return errors.Wrap(err, "CreateSingleInlineWriter")
	}
	defer w.Close()
	if _, err := io.Copy(w, body); err != nil {
		return errors.Wrap(err, "io.Copy")
	}
	return nil
}

// write the message body to the multipart message
func writeMultipartBody(body io.Reader, w *mail.Writer) error {
	bh := mail.InlineHeader{}
	bh.SetContentType("text/plain", map[string]string{"charset": "UTF-8"})

	bi, err := w.CreateInline()
	if err != nil {
		return errors.Wrap(err, "CreateInline")
	}
	defer bi.Close()

	bw, err := bi.CreatePart(bh)
	if err != nil {
		return errors.Wrap(err, "CreatePart")
	}
	defer bw.Close()
	if _, err := io.Copy(bw, body); err != nil {
		return errors.Wrap(err, "io.Copy")
	}
	return nil
}

// write the attachment specified by path to the message
func writeAttachment(path string, writer *mail.Writer) error {
	filename := filepath.Base(path)

	f, err := os.Open(path)
	if err != nil {
		return errors.Wrap(err, "os.Open")
	}
	defer f.Close()

	reader := bufio.NewReader(f)

	// determine the MIME type
	// http.DetectContentType only cares about the first 512 bytes
	head, err := reader.Peek(512)
	if err != nil && err != io.EOF {
		return errors.Wrap(err, "Peek")
	}

	mimeString := http.DetectContentType(head)
	// mimeString can contain type and params (like text encoding),
	// so we need to break them apart before passing them to the headers
	mimeType, params, err := mime.ParseMediaType(mimeString)
	if err != nil {
		return errors.Wrap(err, "ParseMediaType")
	}
	params["name"] = filename

	// set header fields
	ah := mail.AttachmentHeader{}
	ah.SetContentType(mimeType, params)
	// setting the filename auto sets the content disposition
	ah.SetFilename(filename)

	aw, err := writer.CreateAttachment(ah)
	if err != nil {
		return errors.Wrap(err, "CreateAttachment")
	}
	defer aw.Close()

	if _, err := reader.WriteTo(aw); err != nil {
		return errors.Wrap(err, "reader.WriteTo")
	}

	return nil
}

func (c *Composer) GetAttachments() []string {
	return c.attachments
}

func (c *Composer) AddAttachment(path string) {
	c.attachments = append(c.attachments, path)
	c.resetReview()
}

func (c *Composer) DeleteAttachment(path string) error {
	for i, a := range c.attachments {
		if a == path {
			c.attachments = append(c.attachments[:i], c.attachments[i+1:]...)
			c.resetReview()
			return nil
		}
	}

	return errors.New("attachment does not exist")
}

func (c *Composer) resetReview() {
	if c.review != nil {
		c.grid.RemoveChild(c.review)
		c.review = newReviewMessage(c, nil)
		c.grid.AddChild(c.review).At(2, 0)
	}
}

func (c *Composer) termEvent(event tcell.Event) bool {
	switch event := event.(type) {
	case *tcell.EventMouse:
		switch event.Buttons() {
		case tcell.Button1:
			c.FocusTerminal()
			return true
		}
	}
	return false
}

func (c *Composer) termClosed(err error) {
	c.grid.RemoveChild(c.editor)
	c.review = newReviewMessage(c, err)
	c.grid.AddChild(c.review).At(2, 0)
	c.editor.Destroy()
	c.editor = nil
	c.focusable = c.focusable[:len(c.focusable)-1]
	if c.focused >= len(c.focusable) {
		c.focused = len(c.focusable) - 1
	}
}

func (c *Composer) ShowTerminal() {
	if c.editor != nil {
		return
	}
	if c.review != nil {
		c.grid.RemoveChild(c.review)
	}
	editorName := c.config.Compose.Editor
	if editorName == "" {
		editorName = os.Getenv("EDITOR")
	}
	if editorName == "" {
		editorName = "vi"
	}
	editor := exec.Command("/bin/sh", "-c", editorName+" "+c.email.Name())
	c.editor, _ = NewTerminal(editor) // TODO: handle error
	c.editor.OnEvent = c.termEvent
	c.editor.OnClose = c.termClosed
	c.grid.AddChild(c.editor).At(2, 0)
	c.focusable = append(c.focusable, c.editor)
}

func (c *Composer) PrevField() {
	c.focusable[c.focused].Focus(false)
	c.focused--
	if c.focused == -1 {
		c.focused = len(c.focusable) - 1
	}
	c.focusable[c.focused].Focus(true)
}

func (c *Composer) NextField() {
	c.focusable[c.focused].Focus(false)
	c.focused = (c.focused + 1) % len(c.focusable)
	c.focusable[c.focused].Focus(true)
}

func (c *Composer) FocusEditor(editor *headerEditor) {
	c.focusable[c.focused].Focus(false)
	for i, e := range c.focusable {
		if e == editor {
			c.focused = i
			break
		}
	}
	c.focusable[c.focused].Focus(true)
}

// AddEditor appends a new header editor to the compose window.
func (c *Composer) AddEditor(header string, value string, appendHeader bool) {
	if _, ok := c.editors[header]; ok {
		if appendHeader {
			header := c.editors[header].input.String()
			value = strings.TrimSpace(header) + ", " + value
		}
		c.editors[header].input.Set(value)
		if value == "" {
			c.FocusEditor(c.editors[header])
		}
		return
	}
	e := newHeaderEditor(header, value, c.aerc.SelectedAccount().UiConfig())
	if c.config.Ui.CompletionPopovers {
		e.input.TabComplete(c.completer.ForHeader(header), c.config.Ui.CompletionDelay)
	}
	c.editors[header] = e
	c.layout = append(c.layout, []string{header})
	// Insert focus of new editor before terminal editor
	c.focusable = append(
		c.focusable[:len(c.focusable)-1],
		e,
		c.focusable[len(c.focusable)-1],
	)
	c.updateGrid()
	if value == "" {
		c.FocusEditor(c.editors[header])
	}
}

// updateGrid should be called when the underlying header layout is changed.
func (c *Composer) updateGrid() {
	header, height := c.layout.grid(
		func(h string) ui.Drawable { return c.editors[h] },
	)

	if c.grid == nil {
		c.grid = ui.NewGrid().Columns([]ui.GridSpec{
			{ui.SIZE_WEIGHT, ui.Const(1)},
		})
	}

	c.grid.Rows([]ui.GridSpec{
		{ui.SIZE_EXACT, ui.Const(height)},
		{ui.SIZE_EXACT, ui.Const(1)},
		{ui.SIZE_WEIGHT, ui.Const(1)},
	})

	if c.header != nil {
		c.grid.RemoveChild(c.header)
	}
	c.header = header
	c.grid.AddChild(c.header).At(0, 0)
	c.grid.AddChild(ui.NewFill(' ')).At(1, 0)
}

func (c *Composer) reloadEmail() error {
	name := c.email.Name()
	c.email.Close()
	file, err := os.Open(name)
	if err != nil {
		return errors.Wrap(err, "ReloadEmail")
	}
	c.email = file
	return nil
}

type headerEditor struct {
	name     string
	focused  bool
	input    *ui.TextInput
	uiConfig config.UIConfig
}

func newHeaderEditor(name string, value string, uiConfig config.UIConfig) *headerEditor {
	return &headerEditor{
		input:    ui.NewTextInput(value, uiConfig),
		name:     name,
		uiConfig: uiConfig,
	}
}

func (he *headerEditor) Draw(ctx *ui.Context) {
	name := he.name + " "
	size := runewidth.StringWidth(name)
	defaultStyle := he.uiConfig.GetStyle(config.STYLE_DEFAULT)
	headerStyle := he.uiConfig.GetStyle(config.STYLE_HEADER)
	ctx.Fill(0, 0, size, ctx.Height(), ' ', defaultStyle)
	ctx.Printf(0, 0, headerStyle, "%s", name)
	he.input.Draw(ctx.Subcontext(size, 0, ctx.Width()-size, 1))
}

func (he *headerEditor) MouseEvent(localX int, localY int, event tcell.Event) {
	switch event := event.(type) {
	case *tcell.EventMouse:
		switch event.Buttons() {
		case tcell.Button1:
			he.focused = true
		}

		width := runewidth.StringWidth(he.name + " ")
		if localX >= width {
			he.input.MouseEvent(localX-width, localY, event)
		}
	}
}

func (he *headerEditor) Invalidate() {
	he.input.Invalidate()
}

func (he *headerEditor) OnInvalidate(fn func(ui.Drawable)) {
	he.input.OnInvalidate(func(_ ui.Drawable) {
		fn(he)
	})
}

func (he *headerEditor) Focus(focused bool) {
	he.focused = focused
	he.input.Focus(focused)
}

func (he *headerEditor) Event(event tcell.Event) bool {
	return he.input.Event(event)
}

func (he *headerEditor) OnChange(fn func()) {
	he.input.OnChange(func(_ *ui.TextInput) {
		fn()
	})
}

type reviewMessage struct {
	composer *Composer
	grid     *ui.Grid
}

func newReviewMessage(composer *Composer, err error) *reviewMessage {
	spec := []ui.GridSpec{
		{ui.SIZE_EXACT, ui.Const(2)},
		{ui.SIZE_EXACT, ui.Const(1)},
	}
	for i := 0; i < len(composer.attachments)-1; i++ {
		spec = append(spec, ui.GridSpec{ui.SIZE_EXACT, ui.Const(1)})
	}
	// make the last element fill remaining space
	spec = append(spec, ui.GridSpec{ui.SIZE_WEIGHT, ui.Const(1)})

	grid := ui.NewGrid().Rows(spec).Columns([]ui.GridSpec{
		{ui.SIZE_WEIGHT, ui.Const(1)},
	})

	uiConfig := composer.config.Ui

	if err != nil {
		grid.AddChild(ui.NewText(err.Error(), uiConfig.GetStyle(config.STYLE_ERROR)))
		grid.AddChild(ui.NewText("Press [q] to close this tab.",
			uiConfig.GetStyle(config.STYLE_DEFAULT))).At(1, 0)
	} else {
		// TODO: source this from actual keybindings?
		grid.AddChild(ui.NewText("Send this email? [y]es/[n]o/[e]dit/[a]ttach",
			uiConfig.GetStyle(config.STYLE_DEFAULT))).At(0, 0)
		grid.AddChild(ui.NewText("Attachments:",
			uiConfig.GetStyle(config.STYLE_TITLE))).At(1, 0)
		if len(composer.attachments) == 0 {
			grid.AddChild(ui.NewText("(none)",
				uiConfig.GetStyle(config.STYLE_DEFAULT))).At(2, 0)
		} else {
			for i, a := range composer.attachments {
				grid.AddChild(ui.NewText(a, uiConfig.GetStyle(config.STYLE_DEFAULT))).
					At(i+2, 0)
			}
		}
	}

	return &reviewMessage{
		composer: composer,
		grid:     grid,
	}
}

func (rm *reviewMessage) Invalidate() {
	rm.grid.Invalidate()
}

func (rm *reviewMessage) OnInvalidate(fn func(ui.Drawable)) {
	rm.grid.OnInvalidate(func(_ ui.Drawable) {
		fn(rm)
	})
}

func (rm *reviewMessage) Draw(ctx *ui.Context) {
	rm.grid.Draw(ctx)
}