Do up the editor a bit (8295f672) · Commits · Personal Projects / bulletin

editor/tview.go

+50 −64

Original line number	Diff line number	Diff line
		@@ -2,7 +2,8 @@
		Package editor provides a simple editor.

		This is implemented with [github.com/gdamore/tcell] and
		[github.com/rivo/tview]. It would be good to make this work more like EDT.
		[github.com/rivo/tview]. The keybindings are loosely inspired by EDT
		but adapted for modern terminals.

		In addition, it might be an idea to offer a set of editors that work
		like EDT, nano, vi and emacs and allow users to set a preference.
		@@ -32,13 +33,33 @@ func Editor(placeholder, title, message string) (string, error) {
		ContrastSecondaryTextColor: tcell.ColorDefault,
		}
		tview.Styles = theme

		// Use single-line borders everywhere (tview defaults to double
		// for focused widgets).
		tview.Borders.HorizontalFocus = tview.Borders.Horizontal
		tview.Borders.VerticalFocus = tview.Borders.Vertical
		tview.Borders.TopLeftFocus = tview.Borders.TopLeft
		tview.Borders.TopRightFocus = tview.Borders.TopRight
		tview.Borders.BottomLeftFocus = tview.Borders.BottomLeft
		tview.Borders.BottomRightFocus = tview.Borders.BottomRight

		app := tview.NewApplication()

		textArea := tview.NewTextArea().
		SetPlaceholder(placeholder)
		textArea.SetTitle(title)

		// Remap Ctrl-C to copy (by converting it to Ctrl-Q which tview's
		// TextArea handles as the copy-to-clipboard action).
		textArea.SetInputCapture(func(event tcell.EventKey) tcell.EventKey {
		if event.Key() == tcell.KeyCtrlC {
		return tcell.NewEventKey(tcell.KeyCtrlQ, 0, tcell.ModNone)
		}
		return event
		})

		helpInfo := tview.NewTextView().
		SetText(" Press F1 for help, press Ctrl-C to exit")
		SetText(" ^Q Quit F1 Help")
		position := tview.NewTextView().
		SetTextAlign(tview.AlignRight)
		pages := tview.NewPages()
		@@ -47,9 +68,9 @@ func Editor(placeholder, title, message string) (string, error) {
		updateInfos := func() {
		fromRow, fromColumn, toRow, toColumn := textArea.GetCursor()
		if fromRow == toRow && fromColumn == toColumn {
		position.SetText(fmt.Sprintf("Row: %d, Column: %d ", fromRow, fromColumn))
		position.SetText(fmt.Sprintf("Line: %d Col: %d ", fromRow+1, fromColumn+1))
		} else {
		position.SetText(fmt.Sprintf("From Row: %d, Column: %d - To Row: %d, To Column: %d ", fromRow, fromColumn, toRow, toColumn))
		position.SetText(fmt.Sprintf("%d:%d - %d:%d ", fromRow+1, fromColumn+1, toRow+1, toColumn+1))
		}
		}

		@@ -62,55 +83,26 @@ func Editor(placeholder, title, message string) (string, error) {
		AddItem(helpInfo, 1, 0, 1, 1, 0, 0, false).
		AddItem(position, 1, 1, 1, 1, 0, 0, false)

		help1 := tview.NewTextView().
		SetText(`Navigation

		Left arrow: Move left.
		Right arrow: Move right.
		Down arrow: Move down.
		Up arrow: Move up.
		Ctrl-A, Home: Move to the beginning of the current line.
		Ctrl-E, End: Move to the end of the current line.
		Ctrl-F, page down: Move down by one page.
		Ctrl-B, page up: Move up by one page.
		Alt-Up arrow: Scroll the page up.
		Alt-Down arrow: Scroll the page down.
		Alt-Left arrow: Scroll the page to the left.
		Alt-Right arrow: Scroll the page to the right.
		Alt-B, Ctrl-Left arrow: Move back by one word.
		Alt-F, Ctrl-Right arrow: Move forward by one word.

		Press Enter for more help, press Escape to return.`)
		help2 := tview.NewTextView().
		SetText(`Editing

		Type to enter text.
		Ctrl-H, Backspace: Delete the left character.
		Ctrl-D, Delete: Delete the right character.
		Ctrl-K: Delete until the end of the line.
		Ctrl-W: Delete the rest of the word.
		Ctrl-U: Delete the current line.

		Press Enter for more help, press Escape to return.`)
		help3 := tview.NewTextView().
		SetText(`Selecting Text

		Move while holding Shift.
		Double-click to select a word.

		Clipboard

		Ctrl-Q: Copy.
		Ctrl-X: Cut.
		Ctrl-V: Paste.

		helpText := tview.NewTextView().
		SetText(`Navigation Editing
		────────── ───────
		Arrows Move cursor Backspace Delete left
		Home Start of line Delete Delete right
		End End of line ^K Delete to EOL
		PgUp/PgDn Page up/down ^W Delete word
		^Left/^Right Word jump ^U Delete line

		Selection Clipboard
		───────── ─────────
		Shift+Arrows Select ^C Copy
		Double-click Select word ^X Cut
		^V Paste
		Undo
		────
		^Z Undo ^Y Redo

		Ctrl-Z: Undo.
		Ctrl-Y: Redo.

		Press Enter for more help, press Escape to return.`)
		help := tview.NewFrame(help1).
		Press Escape to return.`)
		help := tview.NewFrame(helpText).
		SetBorders(1, 1, 0, 0, 2, 2)
		help.SetBorder(true).
		SetTitle("Help").
		@@ -118,28 +110,22 @@ Press Enter for more help, press Escape to return.`)
		if event.Key() == tcell.KeyEscape {
		pages.SwitchToPage("main")
		return nil
		} else if event.Key() == tcell.KeyEnter {
		switch {
		case help.GetPrimitive() == help1:
		help.SetPrimitive(help2)
		case help.GetPrimitive() == help2:
		help.SetPrimitive(help3)
		case help.GetPrimitive() == help3:
		help.SetPrimitive(help1)
		}
		return nil
		}
		return event
		})

		pages.AddAndSwitchToPage("main", mainView, true).
		AddPage("help", tview.NewGrid().
		SetColumns(0, 64, 0).
		SetRows(0, 22, 0).
		SetColumns(0, 52, 0).
		SetRows(0, 24, 0).
		AddItem(help, 1, 1, 1, 1, 0, 0, true), true, false)

		app.SetInputCapture(func(event tcell.EventKey) tcell.EventKey {
		if event.Key() == tcell.KeyF1 {
		switch event.Key() {
		case tcell.KeyCtrlQ:
		app.Stop()
		return nil
		case tcell.KeyF1:
		pages.ShowPage("help")
		return nil
		}