better syntax highlighting for elixir code #853

tmbb · 2018-05-19T17:48:41Z

Use makeup for syntax highlighting of Elixir code.
Other languages will use Highlightjs as a fallback.

As soon as new lexers are written and properly tested, they can be imported by ExDocMakeup and will be made available. Adding more lexers willincrease compile times, so they should be limited to what makes sense, like Erlang, HTML, Javascript and maybe a few others.

tmbb · 2018-05-19T18:19:53Z

Even after messing with elixir versions in my own packages, it looks like there are problems with older Elixir versions in packges that aren't mine, such as Earmark. This is something for ExDoc to work on (maybe dropping some older versions)

josevalim · 2018-05-19T19:03:23Z

@tmbb you updated the Elixir requirement but you also need to update the travis.yml file. Also please update the docs and error messages in the markdown module.

Question: do you need to use earmark because you integrate with Earmark when traversing code blocks or do you simply do a later pass on the html? Does the prompt feature we talked about work on makeup?

michalmuskala · 2018-05-19T19:34:46Z

How does the compile time for makeup look like compared to "raw" ex_doc?

tmbb · 2018-05-20T01:04:20Z

Also please update the docs and error messages in the markdown module.

Sure, I'll see what needs to be changed.

do you need to use earmark because you integrate with Earmark when traversing code blocks ... ?

I integrate with Earmark when traversing code blocks.

or do you simply do a later pass on the html?

I think I could do this too. This way syntax highlighting would be independent of the markdown implementation. That said, any markdown implementarion that provides a configurable way of rendering code is fine.

josevalim · 2018-05-20T06:52:46Z

I think I could do this too. This way syntax highlighting would be independent of the markdown implementation.

That would be great! Could you please give it a try? Also, if we are going in this direction, I don't think we need exdoc_makeup as a separate project, we could add support for it directly in ExDoc.

tmbb · 2018-05-20T10:10:48Z

Could you please give it a try?

Yes, it shouldn't be very hard...

Also, if we are going in this direction, I don't think we need exdoc_makeup as a separate project, we could add support for it directly in ExDoc.

You don't need ex_doc_makeup as a separate project right now. ex_doc_makeup contains very little actual code, and it could be incorporated into ExDoc itself like the other markdown behaviours are. "Getting rid of ex_dox_makeup" is not a valid reason to work on the HTML directly.

A valid reason would be to decouple it from earmark, I guess, or to allow the user to use something other than markdown for the docs.

But deciding to work on the HTML directly requires:

Knowing the css classes that the markdown implementation decides to add to the fenced code blocks
Parse the language from the css classes
Decode the already escaped contents of the code tag
Highlight the code and escape them again
Insert the highlighted code into the HTML

Steps 1 and 2 are a little problematic because they couple us to a concrete markdown implementation.

This whole setup also breaks all extensibility options we've been working these last few months. Instead of having syntax highlighting coupled to highlightjs you have sybtax highlighting coupled to makeup.

josevalim · 2018-05-20T10:23:33Z

"Getting rid of ex_dox_makeup" is not a valid reason to work on the HTML directly.

Agreed. I phrased my previous sentence poorly.

Steps 1 and 2 are a little problematic because they couple us to a concrete markdown implementation.

Because of highlight.js we already do a pass on the generated html from different markdown engines, so maybe we are not adding much after all. But this needs to be opted-in by the engine so we won’t couple everything to ExDocMakeup. To speak in more concrete terms, each markdown engine would have to call something like ExDoc.Markdown.syntax_highlight(..., ...). Of course all of the built-in engines will use it but it is not a requirement.

Btw, quick question about this code: https://github.com/tmbb/ex_doc_makeup/blob/master/lib/ex_doc_makeup/source_include_plugin.ex#L5-L9

Is it adding a new feature to ExDoc? If so, let's add it to ExDoc itself later, because those features usually require syncing with things like IO.ANSI.Docs in Elixir core itself.

tmbb · 2018-05-20T11:23:55Z

To speak in more concrete terms, each markdown engine would have to call something like ExDoc.Markdown.syntax_highlight(..., ...). Of course all of the built-in engines will use it but it is not a requirement.

Ok, I can get behind that

Btw, quick question about this code:

First, this code is "dead code" now. The module remains but its functions aren't called by anything. It used to do something, though.

Is it adding a new feature to ExDoc?

More or less. It was an Earmark plugin that could extract fragments of files and embed them as code. It's useful to ensure your code examples actually compile by writing them in a .exs or .ex file and only extracting the relevant parts (and you can even run unit tests on the code if you want)

The rust doc generators come with a similar feature included, and Sphinx (from python) also allows this.

I originally added this plugin because I wanted to write an ExSpirit manual and wanted to make sure my example code compiled.

I had a dummy project with modules for code examples and would extract the code examples into the markdown in the guide.

Example:

defmodule DummyModule do
  #! begin: multiple-arities
  def f(x), do: nil
  def f(x, y), do: nil
  #! end: multiple-arities
end

In the markdown file:

Elixir supports functions of multiple arities:

$$ include "lib/dumy_file.ex", block: "multiple-arities"

And a (highlighted) code block would be inserted there. The $$ syntax wasn't my idea, it's the standard Earmark syntax for plugins. Multiple blocks are supported per file, of course.

In the end, I decided I'd remove that because I wouldn't be the one to unilaterally add markdown plugins to the default version of ExDoc xD

Note that the plugin is only required in markdown pages. In moduledocs or normal function docs you can simply define a function that extracts the relevant lines from a file and renders them as a fenced code block and use string interpolation to get it there. For example:

defmodule MyModule do
  import DocsHelper
  @moduledoc """
  Blah blah blah...

  #{include_block "examples/example1.exs", "my-block-name"}

  Blah blah blah
  """
end

You only require the plugin when you're using markdown outside an elixir module (like inside a guide).

tmbb · 2018-05-20T11:29:32Z

Makeup requires some extra assets, of course: a css stylesheet and a small js file so that matching parenthesis and the like are highlighted on mouseover (the JS is 100% optional of course, the syntax highlighting works with JS disabled!).

Those assets would have to be included in ExDoc and declared by the builtin Markdown modules (this require changing only 2 lines of code per module, nothing too big)

tmbb · 2018-05-20T11:37:30Z

How does the compile time for makeup look like compared to "raw" ex_doc?

Makeup with the elixir lexer takes about 4-5 seconds to compile. The elixir lexer is an abnormally complex lexer because Elixir's "syntax" (I'm using the term very loosely) is very complex and nimble_parsec must generateba large number of function heads (which the BEAM must compile and optimize). Other lexers are much more simple and compile in under 0.5s.

My remark about compilation time is that we shouldn't add the 300 lexers in pygments to ExDoc (I wish I had 300 lexers already...), because even at 0.5 seconds per lexer that would be a lot. Python can get away with it because it generates object code very quickly (and on-demand) and Python's documentation generators are not compiled per project

EDIT: @michalmuskala this post is a response to your worries about compile times

josevalim · 2018-05-20T19:50:01Z

Makeup requires some extra assets, of course: a css stylesheet and a small js file so that matching parenthesis and the like are highlighted on mouseover (the JS is 100% optional of course, the syntax highlighting works with JS disabled!).

Alternatively we can include them in the general bundle by making them part of the gulp file. Or we generate a bundle with both highlight+makeup assets.

sourcelevel-bot · 2018-05-20T23:01:54Z

lib/ex_doc/highlighter.ex

+    end
+  end
+
+  # TODO: this implementation is probably not very efficient.


sourcelevel-bot · 2018-05-20T23:01:54Z

lib/ex_doc/highlighter.ex

+    Regex.replace(~r/<pre><code class="(\w+)">([^<]*)<\/code><\/pre>/, html, &highlight_code_block/3)
+  end
+
+


There should be no more than 1 consecutive blank lines.

sourcelevel-bot · 2018-05-20T23:01:55Z

lib/ex_doc/highlighter.ex

+  defp pick_lexer("elixir"), do: Makeup.Lexers.ElixirLexer
+  defp pick_lexer(_other), do: nil
+
+


There should be no more than 1 consecutive blank lines.

sourcelevel-bot · 2018-05-20T23:01:55Z

lib/ex_doc/highlighter.ex

+      String.replace(acc, pattern, escape)
+    end
+  end
+end


There should be a final \n at the end of each file.

tmbb · 2018-05-20T23:19:12Z

Removing support for Elixir 1.3

I've removed support for Elixir 1.3 (because nimble_parsec seems to require 1.4).
I'm aware some tests are failing and I'll solve the issue. I think the problem is that we're trying to match a regex that no longer matches because syntax highlighting happens with HTML.

Makeup now operates on the HTML

Makeup is now called on the generated HTML and not on the markdown. You'll notice a new ExDoc.Highlighter module that exports a function that highlights code blocks in an HTML file. ExDocMakeup is no longer required and ExDoc now depends directly on makeup and makeup_elixir.

Demo

You can see the Phoenix docs highlighted with the new ExDoc package:

Normal docs with elixir code: https://tmbb.github.io/phoenix/endpoint.html
A file that shows the highlighting of iex sessions including errors (I've added a new dummy section to this pase just to showcase error highlighting: https://tmbb.github.io/phoenix/ecto.html

CSS styles

I'm very happy with the style for the day-mode, and I even consider it superior to the default style used by highlightjs (my theme has better contrast and shows more syntactic distinctions).

I'm not as happy with the night-mode theme. The main problem is the style for IEx errors (dark red), which is a little hard to read. I wonder if someone with decent design skills could have a look and suggest improvements.

@josevalim should I create a new issue for this?

tmbb · 2018-05-20T23:30:26Z

Also please update the docs and error messages in the markdown module.

@josevalim now that Makeup is included and used in all default makeup implementations in such a way that the user doesn't even notice it's there, I don't think there's anything I need to change in the docs or in the error messages.

sourcelevel-bot · 2018-05-20T23:43:35Z

lib/ex_doc/highlighter.ex

+    ~s(<pre><code class="nohighlight makeup #{lang}">#{highlighted}</code></pre>)
+  end
+
+  # TODO: this implementation is probably not very efficient.


I would just reverse the implementation in Plug.HTML, which has already been benchmarked. :)

Yes, that seems simple.

josevalim · 2018-05-21T09:01:15Z

mix.exs

      {:earmark, "~> 1.1"},
+      # Syntax highlighting (independent of the markdown implementation)
+      {:makeup, "~> 0.5.1"},
+      {:makeup_elixir, "~> 0.6.0"},


Shouldn't depending on makeup_elixir automatically bring makeup?

Yeah, it should. We can depend only on makeup and makeup_elixir will be brought as a transitive dependency.

You probably mean the other way around. :)

josevalim · 2018-05-21T09:05:20Z

lib/ex_doc/markdown/earmark.ex

+    {"dist/ex_doc_makeup-css.css", File.read!("assets/dist/ex_doc_makeup.css")},
+    # Get the Javascript snippet directly from Makeup.
+    # If there is any need to customize it further, we can add a "ex_doc_makeup.js" file.
+    {"dist/ex_doc_makeup-js.js", HTMLFormatter.group_highlighter_javascript()}


I think the distribution files should be called ex_doc_highlighter because if in three years we decide to use something other than makeup, we don't want to break existing adapters. Similarly, the javascript thingy should be returned by ExDoc.Highlighter. The HTMLFormatter is not really public API and therefore engines should not access it.

And more than that, the assets (including the filenames) should be defined in the ExDoc.Highlighter module, and there should be an ExDoc.Highlighter.assets/1 function that is simply called by the behaviours. That would centralize the assets in the right place.

josevalim · 2018-05-21T09:05:59Z

lib/ex_doc/markdown/cmark.ex

+    text
+    |> Cmark.to_html()
+    |> ExDoc.Markdown.pretty_codeblocks()
+    |> ExDoc.Highlighter.highlight_code_blocks()


One uses code_blocks and the other uses codeblocks.

Although I don't think we need pretty_codeblocks anymore. The functionality in there should be handled by the highlighter.

Although I don't think we need pretty_codeblocks anymore. The functionality in there should be handled by the highlighter.

We don't and it should. It will probably be even more performant if I handle it in the same regex match.

And regarding codeblocks vs code_blocks I prefer code_blocks. Is that ok with you?

I would actually say none? ExDoc.Highlighter.highlight_html? or ExDoc.Highlighter.highlight_html_code?

tmbb · 2018-05-21T10:19:14Z

A little offtopic: I have an Erlang lexer almost ready. It needs more unit tests and some integration testing on real code bases. Do you think I should add ir here once I test it a little better?

josevalim · 2018-05-21T10:53:54Z

A little offtopic: I have an Erlang lexer almost ready. It needs more unit tests and some integration testing on real code bases. Do you think I should add ir here once I test it a little better?

Maybe we could have a discovery system? Every time the makeup_elixir/makeup_erlang/etc application starts, it registers itself with makeup? So adding new engines is a matter of adding new dependencies?

I am thinking something like this:

defmodule Makeup.Elixir.Application do
  def start(_, _) do
    Makeup.register(:elixir, Makeup.Elixir)
    Makeup.register(:iex, Makeup.IEx)
    Supervisor.start_link([], strategy: :one_for_one)
  end
end

This way we can ship only with Elixir and libraries can add more engines as necessary.

tmbb · 2018-05-22T12:29:54Z

@josevalim I'm still not 100% sure of the api for the registry. Could we merge these changes as they are (when all tests pass, etc) and give me some more time to think about the makeup registry?

Removed tests fo functions that no longer exist. Update template tests to recognize code highlighted by makeup.

sourcelevel-bot · 2018-05-23T01:24:38Z

assets/js/makeup.js

+    elem.addEventListener("mouseenter", onMouseEnter);
+    elem.addEventListener("mouseleave", onMouseLeave);
+  }
+}


Newline required at end of file but not found.

sourcelevel-bot · 2018-05-23T01:24:38Z

assets/js/makeup.js

+  for(var i=0; i < delims.length; i++) {
+    var elem = delims[i];
+    elem.addEventListener("mouseenter", onMouseEnter);
+    elem.addEventListener("mouseleave", onMouseLeave);


Extra semicolon.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:39Z

assets/js/makeup.js

+  for(var i=0; i < delims.length; i++) {
+    var elem = delims[i];
+    elem.addEventListener("mouseenter", onMouseEnter);
+    elem.addEventListener("mouseleave", onMouseLeave);


Strings must use singlequote.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:39Z

assets/js/makeup.js

+  var delims = document.querySelectorAll("[data-group-id]");
+  for(var i=0; i < delims.length; i++) {
+    var elem = delims[i];
+    elem.addEventListener("mouseenter", onMouseEnter);


Extra semicolon.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:39Z

assets/js/makeup.js

+  var delims = document.querySelectorAll("[data-group-id]");
+  for(var i=0; i < delims.length; i++) {
+    var elem = delims[i];
+    elem.addEventListener("mouseenter", onMouseEnter);


Strings must use singlequote.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:40Z

assets/js/makeup.js

+  }
+}
+
+function onMouseLeave(evt) {


Missing space before function parentheses.

sourcelevel-bot · 2018-05-23T01:24:40Z

assets/js/makeup.js

+  var groupId = evt.target.getAttribute("data-group-id");
+  var siblings = document.querySelectorAll("[data-group-id='" + groupId + "']");
+  for (var i = 0; i < siblings.length; ++i) {
+    siblings[i].classList.add(HIGHLIGHT_CLASS);


Extra semicolon.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:40Z

assets/js/makeup.js

+var HIGHLIGHT_CLASS = "hll";
+function onMouseEnter(evt) {
+  var groupId = evt.target.getAttribute("data-group-id");
+  var siblings = document.querySelectorAll("[data-group-id='" + groupId + "']");


Extra semicolon.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:40Z

assets/js/makeup.js

@@ -0,0 +1,25 @@
+var HIGHLIGHT_CLASS = "hll";
+function onMouseEnter(evt) {
+  var groupId = evt.target.getAttribute("data-group-id");


Extra semicolon.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:24:40Z

assets/js/makeup.js

@@ -0,0 +1,25 @@
+var HIGHLIGHT_CLASS = "hll";
+function onMouseEnter(evt) {
+  var groupId = evt.target.getAttribute("data-group-id");


Strings must use singlequote.

Read more about it here.

sourcelevel-bot · 2018-05-23T01:33:14Z

formatters/epub/dist/app-12c41c88e5.js

@@ -0,0 +1,2 @@
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I will obviously ignore any issues this ebert bot detects in the artifacts generated by gulp...

sourcelevel-bot · 2018-05-23T01:33:14Z

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sourcelevel-bot · 2018-05-23T01:33:14Z

formatters/epub/dist/app-12c41c88e5.js

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FIXME found

sourcelevel-bot · 2018-05-23T01:33:14Z

formatters/epub/dist/app-12c41c88e5.js

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tmbb · 2018-05-23T01:58:10Z

Assets

Assets are now included in the bundles. This makes sense because syntax highlighting is now a feature of ExDoc and not a feature of the markdown implementation.

Supported Lexers

Currently ExDoc only supports the elixir lexer. This is hardcoded in the source and offers no possibilities for customization. The way forward is to have some kind of registry in which lexers can register themselves on application start. Until I decide which is going to be the final API for such registry, this solution is enough.

In any case, unsupported languages will be highlighted by highlightjs as they are now. So this version of makeup is strictly better than the previous one (it uses a better lexer for Elixir and the same inferior lexers for other languages).

Decoding HTML

It's not obvious how to invert the Plug.HTML implementation (which only encodes and doesn't decode). Even If I inverted it, it is not obvious it would be the fastest possible implementation. In order to have the fastest implementation possible, I'd need to benchmark several possibilities anyway. That will take a couple days because I'm quite busy, and creating a good microbenchmark takes some work.

The current version is quite fast, and probably not a bottleneck for realistic inputs. The implementation can be trivially switched at any time (it's a pure function after all). For these reasons, I think this could be merged and possibly improved in the near future.

CSS Themes

Someone with some experience in design and CSS should take a look at the themes, especially the night mode. In particular, the night mode color for erlang tracings is quite unreadable: (for example here; you have to switch to night-mode)

I can change that color to something else with better contrast, of course, but the contribution of someone with actual design skills would be appreciated. I can explain how the css classes are used (and should probably document it).

Merging

I think that except for the problem with the night-mode theme, this branch is ready to be merged into master and to be released as ex_doc 19.0. Despite the possible improvements I suggest above, I think this version is strictly better than the previous one and perfectionism isn't our friend here.

…xir)

sourcelevel-bot · 2018-05-26T22:24:24Z

lib/ex_doc/highlighter/html_decoder.ex

+    |> to_iodata()
+    |> IO.iodata_to_binary
+  end
+end


There should be a final \n at the end of each file.

@josevalim, is it against the Elixir code of conduct to insult our cute but annoying friend Ebert?

eksperimental · 2018-05-27T17:08:29Z

assets/less/makeup.less

+.night-mode .makeup .vc {color: #ef6155; } /* :name_variable_class */
+.night-mode .makeup .vg {color: #ef6155; } /* :name_variable_global */
+.night-mode .makeup .vi {color: #ef6155; } /* :name_variable_instance */
+.night-mode .makeup .vm {color: #ef6155; } /* :name_variable_magic */


I think if these classes are grouped they could be simplified

What do you mean by "grouped"? Something like:

.night-mode .makeup .vc, .vg, .vi, .vm {color: #ef6155; }

or simply replacing them by a single class? If so, then that's a definite No, because even if this particular theme doesn't show a distinction between these classes, other themes might.

Oh, you're talking about simplifying the whole set of classes xD I can look into it, of course

I mean nesting classes

eksperimental · 2018-05-27T17:11:30Z

mix.exs


  defp deps do
    [
      {:earmark, "~> 1.1"},


Markdown should be in title case

tmbb · 2018-06-05T00:31:47Z

I think this is ready to be merged now :)

milmazz · 2018-06-14T14:28:52Z

@eksperimental ping? Have you had any chance to check the latest changes from @tmbb?

eksperimental · 2018-06-14T17:10:55Z

@milmazz sorry, I haven't . I will try to but please go ahead with it if needs merging

eksperimental · 2018-06-14T17:12:31Z

If it is regarding the CSS changes, YES, that's what I meant, but I haven't had a chance to run this PR locally

tmbb · 2018-06-20T11:58:16Z

If any of my changes is not clear, I'm can help. Just ask :)

josevalim · 2018-07-10T19:06:04Z

Hi @tmbb! Sorry for the delay on this. My plan is to pick this up this week and align it with Elixir v1.7-rc.

sourcelevel-bot · 2018-07-10T20:08:58Z

Ebert has finished reviewing this Pull Request and has found:

16 possible new issues (including those that may have been commented here).
12 fixed issues! 🎉

You can see more details about this review at https://ebertapp.io/github/elixir-lang/ex_doc/pulls/853.

josevalim · 2018-07-10T22:51:03Z

Merged, thank you! I have tried this on the elixir repo and generating docs went from 11.5s to 12.4s! So this is performing amazingly well and the result looks better than the highlighter, IMO! Great job!
❤️ 💚 💙 💛 💜

eksperimental · 2018-07-11T00:25:36Z

👍 👍 👍 👍 👍 👍 👍 👍 👍
thank you @tmbb !

tmbb · 2018-07-11T09:04:08Z

I have tried this on the elixir repo and generating docs went from 11.5s to 12.4s!

The performance impact of using Makeup is only about 8%. This is actually very good, given what it does. Because the impact is so low, improving Makeup's performance won't have a big user-visible impact.

tmbb added 3 commits May 19, 2018 18:24

better syntax highlighting for elixir code

2668501

update minimum elixir version so that it supports nimble_parsec

666e306

fixed deps

b471576

tmbb closed this May 20, 2018

tmbb reopened this May 20, 2018

tmbb added 2 commits May 20, 2018 23:59

use makeup on the generated HTML

bf002b1

drop support for elixir 1.3

3a1d0f3

sourcelevel-bot bot reviewed May 20, 2018

View reviewed changes

fixed 3 of Ebert's issues; refuse to fix the TODO

5fd6086

fix highlighting of non-elixir languages

e09036a

sourcelevel-bot bot reviewed May 20, 2018

View reviewed changes

remove ExDocMakeup from the list of MD implementations

46354a8

josevalim reviewed May 21, 2018

View reviewed changes

tmbb mentioned this pull request May 22, 2018

Registry API elixir-makeup/makeup#13

Closed

tmbb added 3 commits May 22, 2018 23:34

Fix tests

ca54b80

Removed tests fo functions that no longer exist. Update template tests to recognize code highlighted by makeup.

remove debug log

123dfc0

move makeup assets to the js and css bundles

08d475a

sourcelevel-bot bot reviewed May 23, 2018

View reviewed changes

make gulp lint happy

d42b7e8

sourcelevel-bot bot reviewed May 23, 2018

View reviewed changes

tmbb added 2 commits May 23, 2018 18:12

remove explicit dependency on makeup (it will be pulled by makeup_eli…

d0ca3c8

…xir)

add faster decoder (about 2x as fast)

f30fc76

sourcelevel-bot bot reviewed May 26, 2018

View reviewed changes

make our dear friend ebert happy again

c34f5ba

eksperimental suggested changes May 27, 2018

View reviewed changes

tmbb added 4 commits May 27, 2018 18:52

fix spelling in comment

c029cba

use nested css classes

5538985

improve redability of iex errors in night mode

e7e92ec

fixed bug (typo) in the HTML decoder and added tests

9523419

Merge branch 'master' into ex_doc_makeup

14da15c

josevalim closed this Jul 10, 2018

		Regex.replace(~r/<pre><code class="(\w+)">([^<]*)<\/code><\/pre>/, html, &highlight_code_block/3)
		end

		defp pick_lexer("elixir"), do: Makeup.Lexers.ElixirLexer
		defp pick_lexer(_other), do: nil

better syntax highlighting for elixir code #853

better syntax highlighting for elixir code #853

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tmbb commented May 19, 2018

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tmbb commented May 20, 2018 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Removing support for Elixir 1.3

Makeup now operates on the HTML

Demo

CSS styles

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tmbb commented May 20, 2018 •

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