Breadcrumb and statusbar¶

The app shell's header and footer. Under pkg/app you don't create either; the shell owns them, feeds the breadcrumb from the stack's titles, and paints statusbar messages from app.Info / app.Error. Use these packages directly only in a program that doesn't use the shell. Neither owns a pane: each renders exactly one row, and goes in a layout.Fixed(1, layout.Bar(&c)) slot.

Breadcrumb¶

pkg/breadcrumb renders Root › Modules › dev. The last crumb is the current one (bold); earlier crumbs are muted. When the line is too wide, leading crumbs collapse into … so the current one is always visible.

bc := breadcrumb.New(t.Breadcrumb())
bc.SetCrumbs(stack.Crumbs())

Methods: SetCrumbs, SetRect, Width, Rect, CrumbAt(x, y) (which crumb a click hit; the shell turns it into screen.PopTo), BarBackground, BarForeground.

Statusbar¶

pkg/statusbar is a one-line strip with three slots: a static left (the help affordance), a center message region, and a static right (console badge and version). The center has three states: neutral, info and error.

sb := statusbar.New(t.Statusbar(helpLine, "v1.2.0"))
sb.SetInfo("Saved")
sb.SetError("Save failed")
sb.ClearMessage()

Update clears the message on the next key press. Methods: SetInfo, SetError, ClearMessage, Message(), MessageKind(), SetLeft, SetRight, SetRect, plus LeftContentRect, MiddleContentRect, RightContentRect for hit-testing.

Give anything embedded in the bar (such as help hints) the same background as the bar, so the strip reads as one band: t.Help() does this for the help footer.