3Column-Middle with extra panes on the right

[Nigh7Sh4de]

A simple extension of 3Column-Middle (aka wide-middle) where the main pane is in the middle, the secondary pane (on the left) can only hold 1 window, with all other windows stacked vertically on the right pane.

function layout() {
  return {
    name: "n7s",
    extends: "wide-middle",
    getFrameAssignments: (windows, screenFrame) => {
      const mainPaneCount = windows.length > 0 ? 1 : 0;
      const secondaryPaneCount = windows.length > 1 ? 1 : 0;
      const hasSecondaryPane = secondaryPaneCount > 0;
      const extraPaneCount = Math.max(
        windows.length - mainPaneCount - secondaryPaneCount,
        0
      );
      const hasExtraPane = extraPaneCount > 0;

      return windows.reduce((frames, window, index) => {
        let frame;

        if (index < mainPaneCount) {
          frame = {
            x:
              screenFrame.x + (hasSecondaryPane ? screenFrame.width * 0.25 : 0),
            y: screenFrame.y,
            width: hasExtraPane
              ? screenFrame.width * 0.5
              : hasSecondaryPane
              ? screenFrame.width * 0.75
              : screenFrame.width,
            height: screenFrame.height,
          };
        } else if (index < secondaryPaneCount + mainPaneCount) {
          frame = {
            x: screenFrame.x,
            y: screenFrame.y,
            width: screenFrame.width * 0.25,
            height: screenFrame.height,
          };
        } else {
          const extraPaneHeight = screenFrame.height / extraPaneCount;
          const extraPaneYOffset =
            extraPaneHeight * (index - secondaryPaneCount - mainPaneCount);

          frame = {
            x: screenFrame.x + screenFrame.width * 0.75,
            y: screenFrame.y + extraPaneYOffset,
            width: screenFrame.width * 0.25,
            height: extraPaneHeight,
          };
        }

        return { ...frames, [window.id]: frame };
      }, {});
    },
  };
}