// parseFiles is the helper for the method and function. If the argument
// template is nil, it is created from the first file.
func parseFiles(fs http.FileSystem, t *template.Template, filenames ...string) (*template.Template, error) {
if len(filenames) == 0 {
// Not really a problem, but be consistent.
return nil, fmt.Errorf("vfs/html/vfstemplate: no files named in call to ParseFiles")
}
for _, filename := range filenames {
b, err := vfsutil.ReadFile(fs, filename)
if err != nil {
return nil, err
}
s := string(b)
name := path.Base(filename)
// First template becomes return value if not already defined,
// and we use that one for subsequent New calls to associate
// all the templates together. Also, if this file has the same name
// as t, this file becomes the contents of t, so
// t, err := New(name).Funcs(xxx).ParseFiles(name)
// works. Otherwise we create a new template associated with t.
var tmpl *template.Template
if t == nil {
t = template.New(name)
}
if name == t.Name() {
tmpl = t
} else {
tmpl = t.New(name)
}
_, err = tmpl.Parse(s)
if err != nil {
return nil, err
}
}
return t, nil
}
// Basic functionality test.
func ExampleBasic() {
var fs http.FileSystem = assets
walkFn := func(path string, fi os.FileInfo, err error) error {
if err != nil {
log.Printf("can't stat file %s: %v\n", path, err)
return nil
}
fmt.Println(path)
if fi.IsDir() {
return nil
}
b, err := vfsutil.ReadFile(fs, path)
fmt.Printf("%q %v\n", string(b), err)
return nil
}
err := vfsutil.Walk(fs, "/", walkFn)
if err != nil {
panic(err)
}
// Output:
// /
// /folderA
// /folderA/file1.txt
// "Stuff in /folderA/file1.txt." <nil>
// /folderA/file2.txt
// "Stuff in /folderA/file2.txt." <nil>
// /folderB
// /folderB/folderC
// /folderB/folderC/file3.txt
// "Stuff in /folderB/folderC/file3.txt." <nil>
// /not-worth-compressing-file.txt
// "Its normal contents are here." <nil>
// /sample-file.txt
// "This file compresses well. Blaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah!" <nil>
}