Multiple Lines for Long Attribute Value in Jade / Pug

I have this same problem but in a knockoutjs context. I used the backslash like so. Previously:

div(data-bind="template: {name: 'ingredient-template', data: $data}")

Now:

div(data-bind="template: {\
    name: 'ingredient-template',\
    data: $data}")

Note: The backslash must be followed immediately by a newline. I'm not sure if this is the 'official' way, I just did it and it seems to work. One downside of this method is the strings then get rendered with the white space intact. So the above example gets rendered as:

<div data-bind="template: {                    name: 'ingredient-template',                    data: $data}">

This might make it unusable for your example.

Edit Thanks Jon. The var idea from your comment is probably better though still not ideal. Something like:

-var arg  = "M10 315 "
-arg += "L 110 215 "
-arg += "A 30 50 0 0 1 162.55 162.45 "
-arg += "L 172.55 152.45 "
-arg += "A 30 50 -45 0 1 215.1 109.9 "
-arg += "L 315 10"
h3 Arcs
  svg(width="320px", height="320px")
    path(d=arg, 
    stroke="black", fill="green", 
    stroke-width="2", fill-opacity="0.5")

Not sure that the extra characters are worth the reduction in line length.

This is an old question but here is a newer answer.

In my case I am using PUG in vue templates in single file components. So the following works for me.

<template lang='pug'>
  .day(:class=`{
    'disabled': isDisabled,
    'selected': isSameDay,
    'in-range': isInRange,
    'today': isToday,
    'weekend': isWeekend,
    'outside-month': isOutsideMonth }`,
    @click='selectDay'
  ) {{label}}
</template>

i.e. using string interpolation ` instead of ' or "