Add support for --config with JSON file

[menghif]

Fixes #15

This PR adds a --config option to specify all of the other SSG options in a JSON formatted configuration file.

Example:

node index.js --config options.json

where options.json is equal to:

{
  "input": "./docs",
  "output": "./web"
}

would be the equivalent of doing node index.js -i ./docs -o ./web

---

I still need to update the README to document the changes.

[lyu4321]

Hey @menghif, thanks so much for the changes so far. It looks really good!

Just some small things I wanted to point out:

Styling

• Using single quotes for consistency
• "Use a JSON config file" could be "Path to a JSON config file" to match the wording of the other descriptions

Error-handling

• For the console.error()s that you added, add process.exit(-1) after to exit the program

[menghif]

I made the requested changes, except for adding process.exit(-1) because as we discussed it would not allow to reach this line:

jellybean/index.js

Line 265 in cdc6e7c

console.error('Please see --help for options.');

I also added the following if statement:

jellybean/index.js

Line 185 in cdc6e7c

if (fs.statSync(argv.config).isFile() && path.extname(input) == '.json') {

to avoid passing a file that is not .json as config file.

[lyu4321]

Hey @menghif sorry for so much back and forth. I tried testing it again and I noticed that it throws an error when the config file doesn't specify an output folder.

For example, if you test using

{
    "input": "docs",
    "stylesheet": "https://cdn.jsdelivr.net/npm/water.css@2/out/water.css",
    "lang": "fr"
}

It throws an error instead of saving in the default 'dist' folder.

One more thing is that if the JSON config file doesn't exist at all, the error message that is printed is 'Input file or folder is required'. I think that a more accurate message would be something like 'JSON config file is required'.

https://github.com/menghif/jellybean/blob/f8eaeb7fa6424bddfa4779d3a471cfbccbe2c558/index.js#L184-L195

You could add an else statement after this code block.

Thank you so much!!!

Accidentally approved

[menghif]

I'm really seeing the benefit of code review now! Thank you for your help catching those two problems. I fixed them now! Hopefully it's good now 😊

[lyu4321]

@menghif Thanks so much! It looks great, I'll be merging it now :)