Enabling toggling status bar on / off

Only from within the pager right now, toggle key is `=`.

Relates to #93.

m/pager.go

@@ -62,7 +62,9 @@ type Pager struct {
 	// NewPager shows lines by default, this field can hide them
 	ShowLineNumbers bool
 
-	StatusBarStyle   StatusBarStyle
+	StatusBarStyle StatusBarStyle
+	ShowStatusBar  bool
+
 	UnprintableStyle UnprintableStyle
 
 	WrapLongLines bool
@@ -87,6 +89,7 @@ Miscellaneous
 -------------
 * Press 'q' or ESC to quit
 * Press 'w' to toggle wrapping of long lines
+* Press '=' to toggle showing the status bar at the bottom
 
 Moving around
 -------------
@@ -138,6 +141,7 @@ func NewPager(r *Reader) *Pager {
 		reader:          r,
 		quit:            false,
 		ShowLineNumbers: true,
+		ShowStatusBar:   true,
 		DeInit:          true,
 		scrollPosition:  newScrollPosition(name),
 	}
@@ -284,6 +288,9 @@ func (p *Pager) onRune(char rune) {
 			p.isShowingHelp = true
 		}
 
+	case '=':
+		p.ShowStatusBar = !p.ShowStatusBar
+
 	case 'k', 'y':
 		// Clipping is done in _Redraw()
 		p.scrollPosition = p.scrollPosition.PreviousLine(1)

m/screenLines.go

@@ -58,7 +58,10 @@ func (p *Pager) redraw(spinner string) {
 		if p.isShowingHelp {
 			helpText = "Press ESC / q to exit help, '/' to search"
 		}
-		p.setFooter(statusText + spinner + "  " + helpText)
+
+		if p.ShowStatusBar {
+			p.setFooter(statusText + spinner + "  " + helpText)
+		}
 
 	default:
 		panic(fmt.Sprint("Unsupported pager mode: ", p.mode))
@@ -98,6 +101,9 @@ func (p *Pager) renderScreenLines() (lines [][]twin.Cell, statusText string) {
 func (p *Pager) renderLines() ([]renderedLine, string) {
 	_, height := p.screen.Size()
 	wantedLineCount := height - 1
+	if !p.ShowStatusBar {
+		wantedLineCount = height
+	}
 
 	inputLines := p.reader.GetLines(p.lineNumberOneBased(), wantedLineCount)
 	if inputLines.lines == nil {

m/scrollPosition.go

@@ -35,6 +35,7 @@ type scrollPositionCanonical struct {
 	width           int  // From pager
 	height          int  // From pager
 	showLineNumbers bool // From pager
+	showStatusBar   bool // From pager
 	wrapLongLines   bool // From pager
 
 	lineNumberOneBased int // From scrollPositionInternal
@@ -47,6 +48,7 @@ func canonicalFromPager(pager *Pager) scrollPositionCanonical {
 		width:           width,
 		height:          height,
 		showLineNumbers: pager.ShowLineNumbers,
+		showStatusBar:   pager.ShowStatusBar,
 		wrapLongLines:   pager.WrapLongLines,
 
 		lineNumberOneBased: pager.scrollPosition.internalDontTouch.lineNumberOneBased,
@@ -143,7 +145,10 @@ func (si *scrollPositionInternal) handlePositiveDeltaScreenLines(pager *Pager) {
 // This method assumes si contains a canonical position
 func (si *scrollPositionInternal) emptyBottomLinesCount(pager *Pager) int {
 	_, height := pager.screen.Size()
-	unclaimedViewportLines := height - 1 // Status line takes up one row
+	unclaimedViewportLines := height - 1
+	if !pager.ShowStatusBar {
+		unclaimedViewportLines = height
+	}
 
 	// Start counting where the current input line begins
 	unclaimedViewportLines += si.deltaScreenLines