Yes:

$ pup -h
Usage
    pup [flags] [selectors] [optional display function]
Version
    0.4.0
Flags
    -c --color         print result with color
    -f --file          file to read from
    -h --help          display this help
    -i --indent        number of spaces to use for indent or character
    -n --number        print number of elements selected
    -l --limit         restrict number of levels printed
    -p --plain         don't escape html
    -s --strict        ignore non-standard HTML tags
    --pre              preserve preformatted text
    --charset          specify the charset for pup to use
    --version          display version

Note the explanatory note for the -i option (which could be a bit clearer). If the argument to -i is not a number, pup assumes it's the character you want to use for indenting, so...

$ cat t.html
<div class="c1" id="id1">
 content 1
</div>
<div class="c1 c2" id="id2">
 content 2
</div>

$ pup -i 2 < t.html
<html>
  <head>
  </head>
  <body>
    <div class="c1" id="id1">
      content 1
    </div>
    <div class="c1 c2" id="id2">
      content 2
    </div>
  </body>
</html>

$ pup -i $'\t' < t.html
<html>
	<head>
	</head>
	<body>
		<div class="c1" id="id1">
			content 1
		</div>
		<div class="c1 c2" id="id2">
			content 2
		</div>
	</body>
</html>

How to indent with tabs? #200

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