Disable watch and star if not signed in (#12807)

Fix #12070

Signed-off-by: Andrew Thornton <art27@cantab.net>

options/locale/locale_en-US.ini

@@ -746,6 +746,8 @@ forked_from = forked from
 generated_from = generated from
 fork_from_self = You cannot fork a repository you own.
 fork_guest_user = Sign in to fork this repository.
+watch_guest_user = Sign in to watch this repository.
+star_guest_user = Sign in to star this repository.
 copy_link = Copy
 copy_link_success = Link has been copied
 copy_link_error = Use ⌘C or Ctrl-C to copy

templates/repo/header.tmpl

@@ -37,8 +37,8 @@
 				<div class="repo-buttons">
 					<form method="post" action="{{$.RepoLink}}/action/{{if $.IsWatchingRepo}}un{{end}}watch?redirect_to={{$.Link}}">
 						{{$.CsrfTokenHtml}}
-						<div class="ui labeled button" tabindex="0">
-							<button type="submit" class="ui compact basic button">
+						<div class="ui labeled button{{if not $.IsSigned}} poping up{{end}}" tabindex="0"{{if not $.IsSigned}} data-content="{{$.i18n.Tr "repo.watch_guest_user" }}" data-position="top center" data-variation="tiny"{{end}}>
+							<button type="submit" class="ui compact basic button"{{if not $.IsSigned}} disabled{{end}}>
 								{{if $.IsWatchingRepo}}{{svg "octicon-eye-closed" 16}}{{$.i18n.Tr "repo.unwatch"}}{{else}}{{svg "octicon-eye" 16}}{{$.i18n.Tr "repo.watch"}}{{end}}
 							</button>
 							<a class="ui basic label" href="{{.Link}}/watchers">
@@ -48,8 +48,8 @@
 					</form>
 					<form method="post" action="{{$.RepoLink}}/action/{{if $.IsStaringRepo}}un{{end}}star?redirect_to={{$.Link}}">
 						{{$.CsrfTokenHtml}}
-						<div class="ui labeled button" tabindex="0">
-							<button type="submit" class="ui compact basic button">
+						<div class="ui labeled button{{if not $.IsSigned}} poping up{{end}}" tabindex="0"{{if not $.IsSigned}} data-content="{{$.i18n.Tr "repo.star_guest_user" }}" data-position="top center" data-variation="tiny"{{end}}>
+							<button type="submit" class="ui compact basic button"{{if not $.IsSigned}} disabled{{end}}>
 								{{if $.IsStaringRepo}}{{svg "octicon-star-fill" 16}}{{$.i18n.Tr "repo.unstar"}}{{else}}{{svg "octicon-star" 16}}{{$.i18n.Tr "repo.star"}}{{end}}
 							</button>
 							<a class="ui basic label" href="{{.Link}}/stars">