Tutorial Server

Hi everyone!

This is a standalone server for the javascript tutorial https://javascript.info.

You can use it to run the tutorial locally and translate it into your language.

Windows, Unix systems and macOS are supported. For Windows, you'll need to call scripts with ".cmd" extension, that are present in the code alongside with Unix versions.

Installation

1. Install Git and Node.js.

   These are required to update and run the project. For Windows just download and install, otherwise use standard OS install tools (packages or whatever convenient).

   Please use Node.js 10+.

   (Maybe later, optional) If you're going to change images, please install GraphicsMagick.

2. Install global Node modules:

   npm install -g bunyan gulp@4

3. Create the root folder.

   Create a folder /js for the project. If you use another directory as the root, adjust the paths below.

4. Clone the tutorial server into it:

   cd /js
   git clone https://github.com/javascript-tutorial/server
   git clone https://github.com/javascript-tutorial/engine server/modules/engine

   Please note, there are two clone commands. That's not a typo: modules/engine is cloned from another repository.

5. Clone the tutorial text into it.

   The repository starts with the language code, e.g for the French version fr.javascript.info, for Russian – ru.javascript.info etc.

   The English version is en.javascript.info.

   cd /js
   git clone https://github.com/javascript-tutorial/en.javascript.info

6. Run the site

   Install local modules:

   cd /js/server
   npm install

   Run the site with the same language. Above we cloned en tutorial, so:

   ./edit en

   This will import the tutorial from /js/en.javascript.info and start the server.

   Wait a bit while it reads the tutorial from the disk and builds static assets.

   Then access the site at http://127.0.0.1:3000.

7. Edit the tutorial

   As you edit text files in the tutorial text repository (cloned at step 5), the webpage will reload automatically.

Change server language

The server uses English by default for navigation and design.

You can set another language it with the second argument of edit.

E.g. if you cloned ru tutorial, it makes sense to use ru locale for the server as well:

cd /js/server
./edit ru ru

Please note, the server must support that language. There must be corresponding locale files for that language in the code of the server, otherwise it exists with an error. As of now, ru, en, zh, tr and ja are fully supported.

Translating images

Most pictures are in SVG format. Strings inside it are usually just text, they can be replaced.

That's great, as there are many strings in English in images, like tips, notes, etc. They look nice when translated.

Image translations reside in images.yml in the repository root, for example: https://github.com/javascript-tutorial/ru.javascript.info/blob/master/images.yml. Please, create it if needed.

The file format is "YAML", it's quite easy to understand:

code-style.svg:  # image file name
  "No space":    # English string
    text: "Без пробелов" # translation
    position: "center" # (optional) "center" or "right" - to position translated string.

The translated string may become longer or shorter. By default, the translated string starts at the same place:

```
|hello world (before)
|你好世界  (after translation)
```

Sometimes they need to be repositioned:

position: "center" centers the translated string, good if you have a vertical diagram, keeps text centered:

     |
hello world
  你好世界
     |

position: "right" makes sure that the translated string keeps the same right edge:

hello world |
    你好世界 |

After images.yaml with translations is ready, it's time to apply translations:

1. Setup git upstream (if you haven't yet) and pull latest changes:

   cd /js/zh.javascript.info 
   git remote add upstream https://github.com/javascript-tutorial/en.javascript.info
   git fetch upstream master

2. Run the translation task:

   cd /js/server
   # without --image it applies all translations (to all images)
   NODE_LANG=zh glp engine:koa:tutorial:figuresTranslate --image try-catch-flow.svg

For Windows: npm i -g cross-env and prepend the call with cross-env to pass environment variables, like this:

cd /js/server
cross-env NODE_LANG=zh...

The task takes upstream image version (English), replaces strings to it, then writes to same-named image in the tutorial repo.

You may want to open the resulting SVG file directly in the browser to see it.

P.S In order for positioning to work, you need to have ImageMagick installed: https://imagemagick.org/script/download.php (or use packages for Linux/MacOS).

Extract strings

The task to get all strings from an image as YAML (for translation, to add to images.yml):

cd /js/server
NODE_LANG=zh npm run gulp engine:koa:tutorial:imageYaml --image hello.svg

Dev mode

If you'd like to edit the server code (assuming you're familiar with Node.js), not the tutorial text, then there are two steps to do.

First, run the command that imports (and caches) the tutorial:

cd /js/server
NODE_LANG=en TUTORIAL_ROOT=/js/en.javascript.info npm run gulp engine:koa:tutorial:import

For Windows: npm i -g cross-env and prepend the call with cross-env to pass environment variables, like this:

cd /js/server
cross-env NODE_LANG=en...

In the code above, NODE_LANG sets server language, while TUTORIAL_ROOT is the full path to tutorial repo, by default is /js/$NODE_LANG.javascript.info.

Afterwards, call ./dev <server language> to run the server:

cd /js/server
./dev en

Running ./dev uses the tutorial that was imported and cached by the previous command.

It does not "watch" tutorial text, but it reloads the server after code changes.

Again, that's for developing the server code itself, not writing the tutorial.

Troubleshooting

Please ensure you have Node.js version 10+ (node -v shows the version).

If it still doesn't work – file an issue. Please mention OS and Node.js version.

Please pull the very latest git code and install latest NPM modules before publishing an issue.

-- Yours, Ilya Kantor iliakan@javascript.info