Overleaf/services/web/app/views/_metadata.pug

//- Title
-if (metadata && metadata.title)
	title= metadata.title + ' - ' + settings.appName + ', ' + translate("online_latex_editor")
	meta(name="twitter:title", content=metadata.title)
	meta(name="og:title", content=metadata.title)
-else if (typeof(title) == "undefined")
	title= settings.appName + ', '+ translate("online_latex_editor")
	meta(name="twitter:title", content=settings.appName + ', '+ translate("online_latex_editor"))
	meta(name="og:title", content=settings.appName + ', '+ translate("online_latex_editor"))
-else
	title= translate(title) + ' - ' + settings.appName + ', ' + translate("online_latex_editor")
	//- to do - not translate?
	meta(name="twitter:title", content=translate(title))
	meta(name="og:title", content=translate(title))

//- Description
-if (metadata && metadata.description)
	meta(itemprop="description", name="description" , content=metadata.description)
	//-twitter and og descriptions handeled below
-else
	meta(itemprop="description", name="description", content=translate("site_description"))
	meta(itemprop="description", name="twitter:description", content=translate("site_description"))
	meta(itemprop="description", name="og:description", content=translate("site_description"))

//- Image
-if (metadata && metadata.image)
	//- from the CMS
	meta(itemprop="image", name="image", content=metadata.image.fields.file.url)
-else if (metadata && metadata.image_src)
	//- pages with custom metadata images, metadata.image_src is the full image URL
	meta(itemprop="image", name="image", content=metadata.image_src)
-else if (settings.overleaf)
	//- the default image for Overleaf
	meta(itemprop="image", name="image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
-else
	//- the default image for ShareLaTeX
	meta(itemprop="image", name="image", content='/touch-icon-192x192.png')

//- Keywords
-if (metadata && metadata.keywords)
	meta(name="keywords" content=metadata.keywords)

//- Misc
meta(itemprop="name", content=settings.appName + ", the Online LaTeX Editor")

-if (metadata && metadata.robotsNoindexNofollow)
	meta(name="robots" content="noindex, nofollow")

//- Twitter
meta(name="twitter:card", content=metadata && metadata.twitterCardType ? metadata.twitterCardType : 'summary')
-if (settings.social && settings.social.twitter && settings.social.twitter.handle)
	meta(name="twitter:site", content="@" + settings.social.twitter.handle)
-if (metadata && metadata.twitterDescription)
	meta(itemprop="twitter:description", content=metadata.twitterDescription)
-if (metadata && metadata.twitterImage)
	//- from the CMS
	meta(itemprop="image", name="twitter:image", content=metadata.twitterImage.fields.file.url)
	meta(itemprop="image", name="twitter:image:alt", content=metadata.twitterImage.fields.title)
-else if (settings.overleaf)
	//- the default image for Overleaf
	meta(itemprop="image", name="twitter:image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
-else
	//- the default image for ShareLaTeX
	meta(itemprop="image", name="twitter:image", content='/touch-icon-192x192.png')

//- Open Graph
//- to do - add og:url
-if (settings.social && settings.social.facebook && settings.social.facebook.appId)
	meta(name="fb:app_id", content=settings.social.facebook.appId)
-if (metadata && metadata.openGraphDescription)
	meta(itemprop="description", name="og:description", content=metadata.openGraphDescription)
-if (metadata && metadata.openGraphImage)
	//- from the CMS
	meta(itemprop="image", name="og:image", content=metadata.openGraphImage.fields.file.url)
-else if (settings.overleaf)
	//- the default image for Overleaf
	meta(itemprop="image", name="og:image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
-else
	//- the default image for ShareLaTeX
	meta(itemprop="image", name="og:image", content='/touch-icon-192x192.png')
-if (metadata && metadata.openGraphType)
	meta(name="og:type", metadata.openGraphType)
-else
	meta(name="og:type", content="website")

//- Viewport
if metadata && metadata.viewport
	meta(name="viewport" content="width=device-width; initial-scale=1.0; user-scalable=yes;")