Add missing History link to directory listings (#4829)

The feature to list commits from a subdirectory is already there but
so far the history link to it was missing. There is a History button
in the view_file.tmpl already so avoid showing two history buttons in
that case.

The GitHub webinterface has the same History button in the same place
so this makes gitea a little bit more compatible.

Signed-off-by: Bernhard Froehlich <decke@bluelife.at>

templates/repo/home.tmpl

@@ -64,8 +64,8 @@
 			{{ $l := Subtract $n 1}}
 			<div class="fitted item"><span class="ui breadcrumb repo-path"><a class="section" href="{{.RepoLink}}/src/{{EscapePound .BranchNameSubURL}}">{{EllipsisString .Repository.Name 30}}</a>{{range $i, $v := .TreeNames}}<span class="divider">/</span>{{if eq $i $l}}<span class="active section">{{EllipsisString $v 30}}</span>{{else}}{{ $p := index $.Paths $i}}<span class="section"><a href="{{EscapePound $.BranchLink}}/{{EscapePound $p}}">{{EllipsisString $v 30}}</a></span>{{end}}{{end}}</span></div>
 			<div class="right fitted item" id="file-buttons">
-				{{if .Repository.CanEnableEditor}}
 				<div class="ui tiny blue buttons">
+					{{if .Repository.CanEnableEditor}}
 						{{if .CanAddFile}}
 							<a href="{{.RepoLink}}/_new/{{EscapePound .BranchName}}/{{EscapePound .TreePath}}" class="ui button">
 								{{.i18n.Tr "repo.editor.new_file"}}
@@ -76,8 +76,13 @@
 								{{.i18n.Tr "repo.editor.upload_file"}}
 							</a>
 						{{end}}
-					</div>
 					{{end}}
+					{{if and (ne $n 0) (not .IsViewFile)}}
+						<a href="{{.RepoLink}}/commits/{{EscapePound .BranchNameSubURL}}/{{EscapePound .TreePath}}" class="ui button">
+							{{.i18n.Tr "repo.file_history"}}
+						</a>
+					{{end}}
+				</div>
 
 			</div>
 			<div class="fitted item">