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Check for required folders based upon headerLinks right up front (#111)

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I was getting this error when running the examples:

```
Error: It looks like you've enabled language support, but haven't provided translated files. The document with id: 'en-doc1' doesn't exist.
```

However, this error was an indirect result of me not renaming the `docs-examples-from-docusaurus` directory to `docs` since I had `doc` in my
`headerLinks` in the example siteConfig.js.

So let's check the headerLinks and make sure we have the required directories.

Here is an example of the error if I try to load a Docusaurus site just after running `npm run examples` without having renamed the directories.

```
Error: You have 'doc' in your headerLinks, but no 'docs' folder exists one level up from 'website' folder. Are you running the examples? If so, make sure you rename 'docs-examples-from-docusaurus' to 'docs'.
    at /Users/joelm/dev/test/website/node_modules/docusaurus/lib/core/nav/HeaderNav.js:226:15
:
:
```

Test Plan: Tested a local package in verdaccio
This commit is contained in:
Joel Marcey 2017-10-05 11:14:27 -07:00 • committed by GitHub
parent 3558f8ca4e
commit 01ebbb1512
1 changed files with 21 additions and 1 deletions
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22
lib/core/nav/HeaderNav.js
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@ -220,9 +220,29 @@ class HeaderNav extends React.Component {
if (!languages) {
headerLinks.push({ languages: true });
}
// add search bar to end if location not specified
let search = false;
headerLinks.forEach(link => {
if (link.doc && !fs.existsSync(CWD + "/../docs/")) {
throw new Error(
"You have 'doc' in your headerLinks, but no 'docs' folder exists one level up from " +
"'website' folder. Are you running the examples? If so, make sure you rename " +
"'docs-examples-from-docusaurus' to 'docs'."
);
}
if (link.blog && !fs.existsSync(CWD + "/blog/")) {
throw new Error(
"You have 'blog' in your headerLinks, but no 'blog' folder exists in your " +
"website folder. Are you running the examples? If so, make sure you rename " +
"'blog-examples-from-docusaurus' to 'blog'."
);
}
if (link.page && !fs.existsSync(CWD + "/pages/")) {
throw new Error(
"You have 'page' in your headerLinks, but no 'pages' folder exists in your " +
"'website' folder."
);
}
// We will add search bar to end if location not specified
if (link.search) {
search = true;
}