browse: Exclude symlink target size from total, show arrow on size (#6412)

* fileserver: Exclude symlink target size from total, show arrow on size

* Keep both totals

* Linter doesn't like my spelling :(

* Stop parallelizing tests for now

* Update modules/caddyhttp/fileserver/browse.html

* Minor renamings

---------

Co-authored-by: Matthew Holt <mholt@users.noreply.github.com>

modules/caddyhttp/fileserver/browse.html

@@ -991,7 +991,7 @@ footer {
 							<div class="sizebar">
 								<div class="sizebar-bar"></div>
 								<div class="sizebar-text">
-									{{.HumanSize}}
+									{{if .IsSymlink}}↱&nbsp;{{end}}{{.HumanSize}}
 								</div>
 							</div>
 						</td>

modules/caddyhttp/fileserver/browsetplcontext.go

@@ -80,6 +80,13 @@ func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS,
 		}
 
 		size := info.Size()
+
+		if !isDir {
+			// increase the total by the symlink's size, not the target's size,
+			// by incrementing before we follow the symlink
+			tplCtx.TotalFileSize += size
+		}
+
 		fileIsSymlink := isSymlink(info)
 		symlinkPath := ""
 		if fileIsSymlink {
@@ -103,7 +110,8 @@ func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS,
 		}
 
 		if !isDir {
-			tplCtx.TotalFileSize += size
+			// increase the total including the symlink target's size
+			tplCtx.TotalFileSizeFollowingSymlinks += size
 		}
 
 		u := url.URL{Path: "./" + name} // prepend with "./" to fix paths with ':' in the name
@@ -150,9 +158,15 @@ type browseTemplateContext struct {
 	// The number of files (items that aren't directories) in the listing.
 	NumFiles int `json:"num_files"`
 
-	// The total size of all files in the listing.
+	// The total size of all files in the listing. Only includes the
+	// size of the files themselves, not the size of symlink targets
+	// (i.e. the calculation of this value does not follow symlinks).
 	TotalFileSize int64 `json:"total_file_size"`
 
+	// The total size of all files in the listing, including the
+	// size of the files targeted by symlinks.
+	TotalFileSizeFollowingSymlinks int64 `json:"total_file_size_following_symlinks"`
+
 	// Sort column used
 	Sort string `json:"sort,omitempty"`
 
@@ -288,6 +302,12 @@ func (btc browseTemplateContext) HumanTotalFileSize() string {
 	return humanize.IBytes(uint64(btc.TotalFileSize))
 }
 
+// HumanTotalFileSizeFollowingSymlinks is the same as HumanTotalFileSize
+// except the returned value reflects the size of symlink targets.
+func (btc browseTemplateContext) HumanTotalFileSizeFollowingSymlinks() string {
+	return humanize.IBytes(uint64(btc.TotalFileSizeFollowingSymlinks))
+}
+
 // HumanModTime returns the modified time of the file
 // as a human-readable string given by format.
 func (fi fileInfo) HumanModTime(format string) string {