Method FileFS

context.go:670–672

FileFS serves file from given file system. When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths including `assets/images` as their prefix.

(file string, filesystem fs.FS)

// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (c *Context) FileFS(file string, filesystem fs.FS) error {
	return fsFile(c, file, filesystem)
}

func fsFile(c *Context, file string, filesystem fs.FS) error {
	file = path.Clean(file) // `os.Open` and `os.DirFs.Open()` behave differently, later does not like ``, `.`, `..` at all, but we allowed those now need to clean