I am working on an app that allows users to input youtube videos, images, tweets, etc. To accomplish that I used auto_html(https://github.com/dejan/auto_html) and the code works fine. I am now trying to implement redcarpet markdown but whenever I use the function "markdown" (which I defined myself), auto_html stops working.
Here is the code for redcarpet (in the helper file):
module ApplicationHelper
def markdown(text)
markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML, hard_wrap: true, autolink: true, quote: true, fenced_code_blocks: true, strikethrough: true)
return markdown.render(text).html_safe
end
end
Here is the code for auto_html (in the Msg Model):
class Msg < ActiveRecord::Base
auto_html_for :content do
html_escape
image
twitter
vimeo
youtube(:width => 575, :height => 300, :autoplay => false)
soundcloud
link :target => "_blank", :rel => "nofollow"
simple_format
end
end
This is the view:
<p><%= markdown(msg.content_html) %></p>
where msg.content is users' input in text form, and msg.content_html applies auto_html filters and transforms an input URL to its format (image, video, etc).
I got auto_html and markdown working separately. If I leave the code in the view as above, my auto_html loads fine but markdown doesn't work. If I suppress the "_html" from msg.content, markdown works.
Any ideas how to go around this? Am I missing anything?
Related
There are a bunch of tutorials floating around, but they seem to be incomplete or not fully current or don't fully work for me.
This is what I have done.
Gemfile:
gem 'rouge'
gem 'redcarpet'
Then I created a config/initializer/rouge.rb:
require 'rouge/plugins/redcarpet'
Then I created a file called app/assets/stylesheets/rouge.css.erb
<%= Rouge::Themes::Github.render(:scope => '.highlight') %>
Then in my app/helpers/application_helper.rb, I added this:
module ApplicationHelper
class HTML < Redcarpet::Render::HTML
include Rouge::Plugins::Redcarpet
def block_code(code, language)
Rouge.highlight(code, language || 'text', 'html')
end
end
def markdown(text)
render_options = {
filter_html: true,
hard_wrap: true,
link_attributes: { rel: 'nofollow' }
}
renderer = HTML.new(render_options)
extensions = {
autolink: true,
fenced_code_blocks: true,
lax_spacing: true,
no_intra_emphasis: true,
strikethrough: true,
superscript: true
}
Redcarpet::Markdown.new(renderer, extensions).render(text).html_safe
end
end
Then in my show.html.erb, I did this:
<%= markdown(#question.body) %>
But that literally does not work. It outputs my ruby code snippet like this:
How do I get this snippet of code to be formatted like Github? Or even just the first step being to be formatted any at all, then how do I tweak the formatting?
I don't see a stylesheet included in the source of the page, so I don't know which styles to tweak for what I want.
Edit 1
Or even when I do this:
<div class="highlight">
<%= #question.test_suite %>
</div>
It renders like this:
Edit 2
I attempted BoraMa's suggestion and I got output that looks like this:
Edit 3
I made a modification to BoraMa's answer as follows.
In my block_code method, I call highlight as follows:
Rouge.highlight(code, 'ruby', 'html')
Then in my view I do this:
<%= raw rouge_markdown(<<-'EOF'
def rouge_me
puts "this is a #{'test'} for rouge"
end
EOF
) %>
Then that produces this:
Note I am referring to the code snippet at the bottom of the screenshot.
However, the text at the top is generated with this:
<pre class="highlight ruby">
<%= rouge_markdown(#question.body) %>
</pre>
And it is rendered as is shown in the screenshot.
Edit 4
After removing the <div class="highlight">, I see this:
Aka....nothing is being rendered at all.
Once I add raw to my view...aka <%= raw rouge_markdown(#question.body) %>
The view renders this:
Edit 5
Here is the content for various #question objects:
[1] pry(#<#<Class:0x007fc041b97ce8>>)> #question.body
=> "5.times do\r\n puts \"Herro Rerl!\"\r\nend"
[1] pry(#<#<Class:0x007fc041b97ce8>>)> #question.body
=> "puts \"Hello World version 9\"\r\nputs \"This comes after version 8.\"\r\nputs \"This comes after version 7.\"\r\nputs \"This comes after version 6.\"\r\nputs \"This comes after version 5.\"\r\nputs \"This comes after version 4.\"\r\nputs \"This comes after version 3.\"\r\nputs \"This comes after version 2.\"\r\nputs \"This definitely comes after version 1.\""
[1] pry(#<#<Class:0x007fc041b97ce8>>)> #question.body
=> "def convert_relation(invited_gender, relation)\r\n case invited_gender\r\n \twhen \"male\"\r\n \tcase relation\r\n when \"daughter\", \"son\" then \"dad\"\r\n when \"mom\", \"dad\" then \"son\"\r\n when \"grandfather\", \"grandmother\" then \"grandson\"\r\n when \"sister\", \"brother\" then \"brother\"\r\n when \"wife\" then \"husband\"\r\n when \"husband\" then \"husband\"\r\n end\r\n when \"female\"\r\n \tcase relation\r\n when \"daughter\", \"son\" then \"mom\"\r\n when \"mom\", \"dad\" then \"daughter\"\r\n when \"grandfather\", \"grandmother\" then \"granddaughter\"\r\n when \"sister\", \"brother\" then \"sister\"\r\n when \"wife\" then \"wife\"\r\n when \"husband\" then \"wife\"\r\n end\r\n end\r\nend\r\n\r\nputs convert_relation(\"male\", \"wife\")"
The original question indicated (in the solution attempted) that markdown would be used in the highlighted questions but it turned out not to be the case. So this answer is split to two distinct sections, one for highlighting pure code without markdown, the other one for markdown text with code.
A) You want to highlight pure code (no Markdown involved)
In this case, and according to the README, all you need to highlight the code with Rouge is a lexer and a formatter. Since the highlighted text will be displayed on a web page, you need the HTML formatter. For the lexer, you need to know the language the code is in beforehand (or you may try guessing it from the source code itself but it does not seem to be very reliable for small code snippets).
You can create a simple helper method for the highlighting:
module RougeHelper
def rouge(text, language)
formatter = Rouge::Formatters::HTML.new(css_class: 'highlight')
lexer = Rouge::Lexer.find(language)
formatter.format(lexer.lex(text))
end
end
Then in the template, simply call this helper with a text to highlight and the language:
<%= raw rouge("def rouge_me\n puts 'hey!'\nend", "ruby") %>
Which will render:
To get a list of all languages that Rouge supports and their corresponding names that should be passed to the rouge helper, you can use the following code. The code gets all defined lexers from Rouge and shows their tags (i.e. the names Rouge recognizes them with):
Rouge::Lexer.all.map(&:tag).sort
# => ["actionscript", "apache", "apiblueprint", "applescript", ..., "xml", "yaml"]
You can (and probably should) use this list when showing users the languages to choose from in the selection box. Note that each lexer also has the title and desc methods defined that will give you a human-readable name and a short description of each of them. You might want to use this info to be shown to the user, too.
Note: you should get rid of the initializer, the custom HTML class and the div wrapped around the rouge helper call (all of these you have in your original attempt). The only thing you need besides the code above is the CSS rules, which you have already correctly included in the web page.
B) The highlighted text is a Markdown text with code blocks
A couple of changes from your attempt to make it work:
The initializer is not needed, you can remove it I think (but if you don't want to require all the files later in the helper, I guess you can leave it).
Remove the block_code method from the helper class, the same is already done by including the markdown plugin.
Remove the <div class="highlight"> wrapper div from your template and just use the helper in it. Rouge adds its own wrapper with the "highlight" class and another div seems to confuse it.
Try the following helper code. BTW, I moved the code from ApplicationHelper to a separate RougeHelper (but that is not a required change):
module RougeHelper
require 'redcarpet'
require 'rouge'
require 'rouge/plugins/redcarpet'
class HTML < Redcarpet::Render::HTML
include Rouge::Plugins::Redcarpet
end
def rouge_markdown(text)
render_options = {
filter_html: true,
hard_wrap: true,
link_attributes: { rel: 'nofollow' }
}
renderer = HTML.new(render_options)
extensions = {
autolink: true,
fenced_code_blocks: true,
lax_spacing: true,
no_intra_emphasis: true,
strikethrough: true,
superscript: true
}
markdown = Redcarpet::Markdown.new(renderer, extensions)
markdown.render(text)
end
end
Then, in the template, I tried to highlight a test ruby code:
<%= raw rouge_markdown(<<-'EOF'
```ruby
def rouge_me
puts "this is a #{'test'} for rouge"
end
```
EOF
) %>
Note that I needed to specify the language manually, which made me use the 3 backticks way to delimit the code instead of space indentation. I have no clue why the code language autodetection did not work here, perhaps it's a too short code.
In the end this rendered the colors for me nicely:
I'm using Redcarpet for syntax highlighting in my Rails blog application.
In my posts/index.html.erb, I want to truncate the blog posts in order to preview the first few sentences (or paragraph). The user should be able to click on "read more" at the end of the truncated post to read the whole blog post. Unfortunately the "read more" link is not working with Redcarpet (when I don't use my markdown method (see below) the link is working fine). How can I fix that? Do I have to use other options in Redcarpet?
My markdown method in /helpers/application_helper.rb using Redcarpet:
def markdown(content)
renderer = HTMLwithPygments.new(hard_wrap: true, filter_html: true)
options = {
autolink: true,
no_intra_emphasis: true,
disable_indented_code_blocks: true,
fenced_code_blocks: true,
lax_html_blocks: true,
strikethrough: true,
superscript: true
}
Redcarpet::Markdown.new(renderer, options).render(content).html_safe
end
/views/posts/index.html.erb
<%= markdown (truncate(post.content,
length: 600,
separator: ' ',
omission: '... ') {
link_to "read more", post
}) %>
By the way: I am looping through the #posts variable, so "post.content" gives me the content of one post and "post" gives me the post's path.
The "read more" text is showing up but you cannot click on it. When I leave the "markdown" method out, the "read more"-link is working fine.
How can I create the link with my "markdown"-method?
That link isn't Markdown though, it's HTML. Maybe change it to Markdown?
<%= markdown(truncate(post.content, length: 600,
separator: ' ', omission: '... ') {
"[read more](#{post_path(post)})"
}) %>
Change post_path to something appropriate if that's not right.
I'm using the auto_html Ruby gem for my Rails application to handle embedded links in a content field. I was originally using the standard <%= #object.content_html %> method which works fine. However, this doesn't support the extra filters that may be needed. For example, it handles youtube links and image links, but not Soundcloud links. In order to handle Soundcloud links, I had to change the code to <%= auto_html(#object.content) {soundcloud} %> as mentioned in a SO question Auto_html says block not supplied
However, this only now supports Soundcloud and it doesn't support the other filters (Youtube, images, links, etc). How can I support all of them, including soundcloud? Adding soundcloud to the object's model doesn't work:
auto_html_for :content do
html_escape
image
youtube(:width => 400, :height => 250, :autoplay => false)
link :target => "_blank", :rel => "nofollow"
soundcloud
simple_format
end
The problem was that I placed soundcloud after the link filter, so the application was rendering the soundcloud link as a normal link. Here's the final model:
auto_html_for :description do
html_escape
image
youtube(:width => 400, :height => 250, :autoplay => false)
soundcloud
link :target => "_blank", :rel => "nofollow"
simple_format
end
I'm trying to build a form, with formtastic, inside an active_admin model.
The problem is I need a certain script tag and other raw HTML stuff directly inside or around the form.
I'm doing it with the normal form block:
form do |f|
f.inputs :name => "User Details", :for => :user do |user_form|
user_form.input :first_name, :required => true
...
How do I embed a simple div tag right in between?
Or even a script tag?
I thought about using a render :partial, but I want to know if the above method is possible first. Thanks!
You can insert a div or javascript like this:
f.form_buffers.last << content_tag(:div, "Div content here")
f.form_buffers.last << javascript_tag("alert('hi');")
In the current ActiveAdmin the form_buffers is deprecated. Instead it's possible to do the following:
insert_tag(Arbre::HTML::Div) { content_tag(:span, "foo") }
Active admin created a DSL on top of Formtastic according to their docs
https://github.com/activeadmin/activeadmin/blob/master/docs/5-forms.md
So you can now do:
form do |f|
f.semantic_errors(*f.object.errors.keys)
import_errors = self.controller.instance_variable_get("#errors")
if import_errors.present?
ul class: 'errors' do
import_errors.each do |e|
li e
end
end
end
# ...
end
I started to use formstatic but I need to make a file field with image preview. I mean, when i edit an object, i want to see the image already linked.
How can I do that?
Thank you !
The answer is to use the hint attribute :
ActiveAdmin.register Event do
form :html => { :enctype => "multipart/form-data" } do |f|
f.input :map, :as => :file, :hint => f.template.image_tag(f.object.map.url(:thumb))
end
end
Bye
Use paperclip with formtastic
Formtasitc's github page mentions that it supports paperclip:
:file – a file field. Default for file-attachment attributes matching: paperclip or attachment_fu.
Here are some useful screencasts that will get you going:
Paperclip
Cropping images
EDIT:
To display an image in a column of a grid in ActiveAdmin you need to make a custom column (This is untested and could be flawed, I'm extrapolating this from the documentation):
index do
column "Title" do |post|
link_to image_tag("path to file", :alt => "post image"), admin_post_path(post)
end
end
Two Gems and one plugin can help your case:
Make sure you look at:
Gems:
Paperclip: https://github.com/thoughtbot/paperclip
RailsCast on PaperClip: http://railscasts.com/episodes/134-paperclip
CarrierWave: https://github.com/carrierwaveuploader/carrierwave
RailsCast on CarrierWave: http://railscasts.com/episodes/253-carrierwave-file-uploads
Jquery File Upload: https://github.com/blueimp/jQuery-File-Upload
Jquery File Upload RailsCast: http://railscasts.com/episodes/381-jquery-file-upload (Need a Pro Account for RailsCast)
As #ianpetzer said, in Rails 4.2 / ActiveAdmin master the current answer causes an object reference to be written out as well. The correct answer for 2016 should be similar to this answer:
form :html => { :multipart => true } do |f|
f.inputs do
#...
f.input :image, required: false, hint: image_tag(object.image.url(:medium)).html_safe
#...
end
end