Add UI options to save/pipe messages with unsupported mimetypes

Adds a message indicating the user's ability to :save or :pipe a message
with an unsupported mimetype and also adds a selector widget (similar to
the tutorial).

The selector widget was previously defined in the account wizard module,
so this commit breaks it out into its own module to allow for re-use.

Further, modify the BeginExLine() function to take an argument that
pre-populates the command line, allowing functions to initiate an ex
command without executing it.

Closes #95.

1 files changed, 103 insertions, 0 deletions

diff --git a/widgets/selecter.go b/widgets/selecter.go
new file mode 100644
index 00000000..7fae9cda
--- /dev/null
+++ b/widgets/selecter.go
@@ -0,0 +1,103 @@
+package widgets
+
+import (
+	"github.com/gdamore/tcell"
+
+	"git.sr.ht/~sircmpwn/aerc/lib/ui"
+)
+
+type Selecter struct {
+	ui.Invalidatable
+	chooser bool
+	focused bool
+	focus   int
+	options []string
+
+	onChoose func(option string)
+	onSelect func(option string)
+}
+
+func NewSelecter(options []string, focus int) *Selecter {
+	return &Selecter{
+		focus:   focus,
+		options: options,
+	}
+}
+
+func (sel *Selecter) Chooser(chooser bool) *Selecter {
+	sel.chooser = chooser
+	return sel
+}
+
+func (sel *Selecter) Invalidate() {
+	sel.DoInvalidate(sel)
+}
+
+func (sel *Selecter) Draw(ctx *ui.Context) {
+	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
+	x := 2
+	for i, option := range sel.options {
+		style := tcell.StyleDefault
+		if sel.focus == i {
+			if sel.focused {
+				style = style.Reverse(true)
+			} else if sel.chooser {
+				style = style.Bold(true)
+			}
+		}
+		x += ctx.Printf(x, 1, style, "[%s]", option)
+		x += 5
+	}
+}
+
+func (sel *Selecter) OnChoose(fn func(option string)) *Selecter {
+	sel.onChoose = fn
+	return sel
+}
+
+func (sel *Selecter) OnSelect(fn func(option string)) *Selecter {
+	sel.onSelect = fn
+	return sel
+}
+
+func (sel *Selecter) Selected() string {
+	return sel.options[sel.focus]
+}
+
+func (sel *Selecter) Focus(focus bool) {
+	sel.focused = focus
+	sel.Invalidate()
+}
+
+func (sel *Selecter) Event(event tcell.Event) bool {
+	switch event := event.(type) {
+	case *tcell.EventKey:
+		switch event.Key() {
+		case tcell.KeyCtrlH:
+			fallthrough
+		case tcell.KeyLeft:
+			if sel.focus > 0 {
+				sel.focus--
+				sel.Invalidate()
+			}
+			if sel.onSelect != nil {
+				sel.onSelect(sel.Selected())
+			}
+		case tcell.KeyCtrlL:
+			fallthrough
+		case tcell.KeyRight:
+			if sel.focus < len(sel.options)-1 {
+				sel.focus++
+				sel.Invalidate()
+			}
+			if sel.onSelect != nil {
+				sel.onSelect(sel.Selected())
+			}
+		case tcell.KeyEnter:
+			if sel.onChoose != nil {
+				sel.onChoose(sel.Selected())
+			}
+		}
+	}
+	return false
+}