Remove dublicates

[csscomb]

Remove dublicates

[kizu]

This is not a task for this tool, it should be done using any other available minifier like CSSO.

However, you can always write a plugin for csscomb doing this if you wish.

[drgullin]

CSSO is a great tool for the CSS optimization, but it shrinks all the code and makes it unreadable.

CSSComb is needed to provide a better CSS output, it's all about the quality.
Dublicates removal is one of the parts of making the final code better.

[mishanga]

Duplicates — is about optimization, not coding style.

Additionly, it may work incorrectly in ambiguous cases.
For example there can be such code:

a { color: blue }
a:hover { color: red }
a:visited { color: blue } /* visited link under pointer will be blue */

It can not be tranlated into

a, a:visited { color: blue }
a:hover { color: red } /* visited link under pointer will be red */

because result will be broken.

[drgullin]

That's a structural optimization, I meant a simpler one:

=indent()
  overflow: hidden
  display: block
  text-indent: 100%
  white-space: nowrap

a
  display: block;
  white-space: nowrap
  +indent()

Should be compiled to (dublicates removal and sort order):

a {
  display: block;
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
}

Now this code compiles to:

a {
  display: block;
  display: block;
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  white-space: nowrap;
}

That's a quite strange coding style.

CSSO shrinks all the code, it doesn't help when a size optimization is not needed.

While there's a "strip-spaces": true option, "strip-dublicates": true won't be a bloat.

CSSComb may erase === synonyms only (' and " should be handled as a same symbols) and keep all the others.

[mishanga]

Should it remove rules with comments?
Like this:

a {
color: red;
color: /* important */ red;
}

Is it equal synonyms?

[drgullin]

Yes, this one too:

color: red; /* important */

It may keep the last match or the one with comment.

[mishanga]

a {
color: /* foo */ red;
color: red; /* bar */
color: red;
}

If you choose one of rules, you'll loose one or both comments.

So, the issue is:

1. complicated
2. ambiguous
3. not about coding style.

Sorry :)