Add initial compose widget

aerc.go

@@ -25,6 +25,11 @@ func getCommands(selected libui.Drawable) []*commands.Commands {
 			account.AccountCommands,
 			commands.GlobalCommands,
 		}
+	case *widgets.Composer:
+		return []*commands.Commands{
+			// TODO: compose-specific commands
+			commands.GlobalCommands,
+		}
 	case *widgets.MessageViewer:
 		return []*commands.Commands{
 			msgview.MessageViewCommands,

commands/account/compose.go

@@ -0,0 +1,28 @@
+package account
+
+import (
+	"errors"
+
+	"github.com/mattn/go-runewidth"
+
+	"git.sr.ht/~sircmpwn/aerc2/widgets"
+)
+
+func init() {
+	register("compose", Compose)
+}
+
+// TODO: Accept arguments for default headers, message body
+func Compose(aerc *widgets.Aerc, args []string) error {
+	if len(args) != 1 {
+		return errors.New("Usage: compose")
+	}
+	// TODO: Pass along the sender info
+	composer := widgets.NewComposer()
+	// TODO: Change tab name when message subject changes
+	aerc.NewTab(composer, runewidth.Truncate(
+		"New email", 32, "…"))
+	return nil
+}
+
+

config/binds.conf

@@ -39,6 +39,14 @@ r = :reply<Enter>
 a = :reply -a<Enter>
 f = :forward<Enter>
 
+[compose]
+$noinherit = true
+$ex = <semicolon>
+<C-k> = :prev-field<Enter>
+<C-j> = :next-field<Enter>
+<C-p> = :prev-tab<Enter>
+<C-n> = :next-tab<Enter>
+
 [terminal]
 $noinherit = true
 $ex = <semicolon>

lib/ui/textinput.go

@@ -22,10 +22,11 @@ type TextInput struct {
 // Creates a new TextInput. TextInputs will render a "textbox" in the entire
 // context they're given, and process keypresses to build a string from user
 // input.
-func NewTextInput() *TextInput {
+func NewTextInput(text string) *TextInput {
 	return &TextInput{
 		cells: -1,
-		text:  []rune{},
+		text:  []rune(text),
+		index: len([]rune(text)),
 	}
 }
 

widgets/aerc.go

@@ -91,6 +91,8 @@ func (aerc *Aerc) getBindings() *config.KeyBindings {
 	switch aerc.SelectedTab().(type) {
 	case *AccountView:
 		return aerc.conf.Bindings.MessageList
+	case *Composer:
+		return aerc.conf.Bindings.Compose
 	case *MessageViewer:
 		return aerc.conf.Bindings.MessageView
 	case *Terminal:

widgets/compose.go

@@ -0,0 +1,122 @@
+package widgets
+
+import (
+	"os/exec"
+
+	"github.com/gdamore/tcell"
+	"github.com/mattn/go-runewidth"
+
+	"git.sr.ht/~sircmpwn/aerc2/lib/ui"
+)
+
+type headerEditor struct {
+	ui.Invalidatable
+	name  string
+	input *ui.TextInput
+}
+
+type Composer struct {
+	headers struct {
+		from    *headerEditor
+		subject *headerEditor
+		to      *headerEditor
+	}
+
+	editor *Terminal
+	grid   *ui.Grid
+
+	focusable []ui.DrawableInteractive
+	focused   int
+}
+
+// TODO: Let caller configure headers, initial body (for replies), etc
+func NewComposer() *Composer {
+	grid := ui.NewGrid().Rows([]ui.GridSpec{
+		{ui.SIZE_EXACT, 3},
+		{ui.SIZE_WEIGHT, 1},
+	}).Columns([]ui.GridSpec{
+		{ui.SIZE_WEIGHT, 1},
+	})
+
+	// TODO: let user specify extra headers to edit by default
+	headers := ui.NewGrid().Rows([]ui.GridSpec{
+		{ui.SIZE_EXACT, 1}, // To/From
+		{ui.SIZE_EXACT, 1}, // Subject
+		{ui.SIZE_EXACT, 1}, // [spacer]
+	}).Columns([]ui.GridSpec{
+		{ui.SIZE_WEIGHT, 1},
+		{ui.SIZE_WEIGHT, 1},
+	})
+
+	headers.AddChild(newHeaderEditor("To", "Simon Ser <contact@emersion.fr>")).At(0, 0)
+	headers.AddChild(newHeaderEditor("From", "Drew DeVault <sir@cmpwn.com>")).At(0, 1)
+	headers.AddChild(newHeaderEditor("Subject", "Re: [PATCH RFC aerc2] widgets: fix StatusLine race")).At(1, 0).Span(1, 2)
+	headers.AddChild(ui.NewFill(' ')).At(2, 0).Span(1, 2)
+
+	// TODO: built-in config option, $EDITOR, then vi, in that order
+	// TODO: temp file
+	editor := exec.Command("vim")
+	term, _ := NewTerminal(editor)
+
+	grid.AddChild(headers).At(0, 0)
+	grid.AddChild(term).At(1, 0)
+
+	return &Composer{
+		grid:    grid,
+		editor:  term,
+		focused: 0,
+		focusable: []ui.DrawableInteractive{
+			term,
+		},
+	}
+}
+
+func (c *Composer) Draw(ctx *ui.Context) {
+	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)
+	})
+}
+
+// TODO: Focus various fields separately
+// TODO: Consider having a different set of keybindings for a focused and
+// unfocused terminal?
+func (c *Composer) Event(event tcell.Event) bool {
+	if c.editor != nil {
+		return c.editor.Event(event)
+	}
+	return false
+}
+
+func (c *Composer) Focus(focus bool) {
+	if c.editor != nil {
+		c.editor.Focus(focus)
+	}
+}
+
+func newHeaderEditor(name string, value string) *headerEditor {
+	// TODO: Set default vaule to something sane, I guess
+	return &headerEditor{
+		input: ui.NewTextInput(value),
+		name:  name,
+	}
+}
+
+func (he *headerEditor) Draw(ctx *ui.Context) {
+	name := he.name + " "
+	size := runewidth.StringWidth(name)
+	ctx.Fill(0, 0, size, ctx.Height(), ' ', tcell.StyleDefault)
+	ctx.Printf(0, 0, tcell.StyleDefault.Bold(true), "%s", name)
+	he.input.Draw(ctx.Subcontext(size, 0, ctx.Width()-size, 1))
+}
+
+func (he *headerEditor) Invalidate() {
+	he.DoInvalidate(he)
+}

widgets/exline.go

@@ -14,7 +14,7 @@ type ExLine struct {
 }
 
 func NewExLine(commit func(cmd string), cancel func()) *ExLine {
-	input := ui.NewTextInput().Prompt(":")
+	input := ui.NewTextInput("").Prompt(":")
 	exline := &ExLine{
 		cancel: cancel,
 		commit: commit,