Fit to Width.sketchplugin

// Fit to Width (cmd shift 1)
// This plugin will zoom out to fit the canvas' contents in the window,
// but maximizing the width only
var doc = context.document,
    margin = 50,
    view = [doc currentView],
    window_width  = view.frame().size.width,
    window_height = view.frame().size.height,
    layers = doc.currentPage().containedLayers(),
    layerRect = [view totalRectForLayers:layers]

// Calculate vertical ratio
var ratio = window_width / window_height

// Set rect height to new ratio
layerRect.size.height = layerRect.size.width / ratio

layerRect.origin.x -= margin
layerRect.origin.y -= margin
layerRect.size.width += margin*2
layerRect.size.height += margin*2

[view zoomToFitRect:layerRect]