tui: revamp footer (some more)

Simplified layout logic, reorganized elements

pkg/tui/util/util.go

@@ -61,22 +61,52 @@ func Width(str string) int {
 	return ansi.PrintableRuneWidth(str)
 }
 
-// truncate a string until its rendered cell width + the provided tail fits
-// within the given width
-func TruncateToCellWidth(str string, width int, tail string) string {
-	cellWidth := ansi.PrintableRuneWidth(str)
-	if cellWidth <= width {
-		return str
-	}
-	tailWidth := ansi.PrintableRuneWidth(tail)
-	for {
-		str = str[:len(str)-((cellWidth+tailWidth)-width)]
-		cellWidth = ansi.PrintableRuneWidth(str)
-		if cellWidth+tailWidth <= max(width, 0) {
-			break
-		}
-	}
-	return str + tail
+func TruncateRightToCellWidth(str string, width int, tail string) string {
+    cellWidth := ansi.PrintableRuneWidth(str)
+    if cellWidth <= width {
+        return str
+    }
+
+    tailWidth := ansi.PrintableRuneWidth(tail)
+    if width <= tailWidth {
+        return tail[:width]
+    }
+
+    targetWidth := width - tailWidth
+    runes := []rune(str)
+
+    for i := len(runes) - 1; i >= 0; i-- {
+        str = string(runes[:i])
+        if ansi.PrintableRuneWidth(str) <= targetWidth {
+            return str + tail
+        }
+    }
+
+    return tail
+}
+
+func TruncateLeftToCellWidth(str string, width int, tail string) string {
+    cellWidth := ansi.PrintableRuneWidth(str)
+    if cellWidth <= width {
+        return str
+    }
+
+    tailWidth := ansi.PrintableRuneWidth(tail)
+    if width <= tailWidth {
+        return tail[:width]
+    }
+
+    targetWidth := width - tailWidth
+    runes := []rune(str)
+
+    for i := 0; i < len(runes); i++ {
+        str = string(runes[i:])
+        if ansi.PrintableRuneWidth(str) <= targetWidth {
+            return tail + str
+        }
+    }
+
+    return tail
 }
 
 func ScrollIntoView(vp *viewport.Model, offset int, edge int) {
@@ -105,4 +135,3 @@ func ErrorBanner(err error, width int) string {
 		Foreground(lipgloss.Color("1")).
 		Render(fmt.Sprintf("%s", err))
 }
-