# How to write a wiki page

This template is a tutorial on creating a page on the ARC wiki. In it we will cover structure, basic syntax, and other useful hints.

If you’re reading this, you have some valuable knowledge built over the course of working on an ARC project that you want to share so others can benefit from your efforts.

The first 100 words are used as an excerpt on the wiki’s Index. No images, HTML, or special formating should be used in this section as it won’t be displayed properly.

If you’re writing a tutorial, use this section to specify what the reader will be able to accomplish and the tools you will be using. If you’re writing an article, this section should be used to encapsulate the topic covered. Use Wikipedia for inspiration on how to write a proper introduction to a topic.

Use this section to cover important terms and information useful to completing the tutorial or understanding the topic addressed. Don’t be afraid to include to other wiki entries that would be useful for what you intend to cover. Notice that there are two #’s used for subheadings; that’s the minimum. Each additional sublevel will have an added #. It’s strongly recommended that you create and work from an outline.

This section covers the basic syntax and some rules of thumb for writing.

### Basic syntax

A line in between create a separate paragraph. This is italicized. This is bold. Here is a link. If you want to display the URL, you can do it like this http://ri.cmu.edu/.

This is a note. Use it to reinforce important points, especially potential show stoppers for your readers. It is also appropriate to use for long quotes from other texts.

#### Bullet points and numbered lists

Here are some hints on writing (in no particular order):

• Focus on application knowledge.
• Write tutorials to achieve a specific outcome.
• Relay theory in an intuitive way (especially if you initially struggled).
• It is likely that others are confused in the same way you were. They will benefit from your perspective.
• You do not need to be an expert to produce useful content.
• Document procedures as you learn them. You or others may refine them later.
• Follow KISS (Keep It Simple Stupid)
• Boil complexity down to its core ideas
• Write clearly

Entries in the Wiki should follow this format:

1. Excerpt introducing the entry’s contents.
• Be sure to specify if it is a tutorial or an article.
• Remember that the first 100 words get used else where. A well written excerpt ensures that your entry gets read.
2. The content of your entry.
3. Summary.
5. Further Reading (relevant articles on other sites).
6. References.

#### Code snippets

You can display code inline like this. This can be used for filenames and ROS_node_names.

Larger chunks of code should use this format:

def recover_msg(msg):

// Good coders comment their code for others.

pw = ProtocolWrapper()

// Explanation.

if rec_crc != calc_crc:
return None


This would be a good spot further explain you code snippet. Break it down for the user so they understand what is going on.

#### LaTex Math Support

Here is an example MathJax inline rendering $\phi(x|y)$ (note the additional escape for using |), and here is a block rendering: $\frac{1}{n^{2}}$

#### Mermaid + Charts Support

Example of Mermaid diagrams

graph TB;
A[Do you have a problem in your life?]
B[Then don't worry]
C[Can you do something about it?]
A--no-->B;
A--yes-->C;
C--no-->B;
C--yes-->B;


Chart.js Support

{
"type": "line",
"data": {
"labels": [
"January",
"February",
"March",
"April",
"May",
"June",
"July"
],
"datasets": [
{
"label": "# of bugs",
"fill": false,
"lineTension": 0.1,
"backgroundColor": "rgba(75,192,192,0.4)",
"borderColor": "rgba(75,192,192,1)",
"borderCapStyle": "butt",
"borderDash": [],
"borderDashOffset": 0,
"borderJoinStyle": "miter",
"pointBorderColor": "rgba(75,192,192,1)",
"pointBackgroundColor": "#fff",
"pointBorderWidth": 1,
"pointHoverBackgroundColor": "rgba(75,192,192,1)",
"pointHoverBorderColor": "rgba(220,220,220,1)",
"pointHoverBorderWidth": 2,
"data": [
65,
59,
80,
81,
56,
55,
40
],
"spanGaps": false
}
]
},
"options": {}
}


### Images/GIFs

Add images to the assets/images folder that is present in every project directory

![Put a relevant caption here](/wiki/contributing/assets/images/wario.png)


or using html if you want to define the width of the image

<img src="assets/images/wario.png" alt="Put a relevant caption here" width="400"/>


Adding GIFs is the same process as images except put them in assets/gifs.

### Videos

Videos take up a lot of space in GitHub, so we recommend using Google Drive as it is currently supported.

1. For the desired video, change the link sharing setting to On - Anyone with the link. This will make the video accessible to anyone who has the link as no sign-in is required. Important: If you do not change the video setting to this option, your video will not show.
2. Double click the video to show the preview. Click the setting options and select “Open in new window”. Now click on the setting option again and select “Embed item”. The iframe code should appear. For the following code, 1EC8BnjJMon-vqy-UhLKk9sf_oukZzEbP/preview would be your video ID.
<iframe src="https://drive.google.com/file/d/1EC8BnjJMon-vqy-UhLKk9sf_oukZzEbP/preview"></iframe>


3. Lastly, add the following snippet to include the embedded video in your article. Remove the space between { and % to see the embed.

{ % include googleDrivePlayer.html id="id" % }


#### Other

To add support for other options, refer to this repo.

## Summary

Use this space to reinforce key points and to suggest next steps for your readers.