hugo/hugofs/hashing_fs.go

93 lines
2.5 KiB
Go
Raw Normal View History

// Copyright 2019 The Hugo Authors. All rights reserved.
Add Hugo Piper with SCSS support and much more Before this commit, you would have to use page bundles to do image processing etc. in Hugo. This commit adds * A new `/assets` top-level project or theme dir (configurable via `assetDir`) * A new template func, `resources.Get` which can be used to "get a resource" that can be further processed. This means that you can now do this in your templates (or shortcodes): ```bash {{ $sunset := (resources.Get "images/sunset.jpg").Fill "300x200" }} ``` This also adds a new `extended` build tag that enables powerful SCSS/SASS support with source maps. To compile this from source, you will also need a C compiler installed: ``` HUGO_BUILD_TAGS=extended mage install ``` Note that you can use output of the SCSS processing later in a non-SCSSS-enabled Hugo. The `SCSS` processor is a _Resource transformation step_ and it can be chained with the many others in a pipeline: ```bash {{ $css := resources.Get "styles.scss" | resources.ToCSS | resources.PostCSS | resources.Minify | resources.Fingerprint }} <link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen"> ``` The transformation funcs above have aliases, so it can be shortened to: ```bash {{ $css := resources.Get "styles.scss" | toCSS | postCSS | minify | fingerprint }} <link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen"> ``` A quick tip would be to avoid the fingerprinting part, and possibly also the not-superfast `postCSS` when you're doing development, as it allows Hugo to be smarter about the rebuilding. Documentation will follow, but have a look at the demo repo in https://github.com/bep/hugo-sass-test New functions to create `Resource` objects: * `resources.Get` (see above) * `resources.FromString`: Create a Resource from a string. New `Resource` transformation funcs: * `resources.ToCSS`: Compile `SCSS` or `SASS` into `CSS`. * `resources.PostCSS`: Process your CSS with PostCSS. Config file support (project or theme or passed as an option). * `resources.Minify`: Currently supports `css`, `js`, `json`, `html`, `svg`, `xml`. * `resources.Fingerprint`: Creates a fingerprinted version of the given Resource with Subresource Integrity.. * `resources.Concat`: Concatenates a list of Resource objects. Think of this as a poor man's bundler. * `resources.ExecuteAsTemplate`: Parses and executes the given Resource and data context (e.g. .Site) as a Go template. Fixes #4381 Fixes #4903 Fixes #4858
2018-02-20 09:02:14 +00:00
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hugofs
import (
"crypto/md5"
"encoding/hex"
"hash"
"os"
"github.com/spf13/afero"
)
var (
_ afero.Fs = (*md5HashingFs)(nil)
)
// FileHashReceiver will receive the filename an the content's MD5 sum on file close.
type FileHashReceiver interface {
OnFileClose(name, md5sum string)
}
type md5HashingFs struct {
afero.Fs
hashReceiver FileHashReceiver
}
// NewHashingFs creates a new filesystem that will receive MD5 checksums of
// any written file content on Close. Note that this is probably not a good
// idea for "full build" situations, but when doing fast render mode, the amount
// of files published is low, and it would be really nice to know exactly which
// of these files where actually changed.
// Note that this will only work for file operations that use the io.Writer
// to write content to file, but that is fine for the "publish content" use case.
func NewHashingFs(delegate afero.Fs, hashReceiver FileHashReceiver) afero.Fs {
return &md5HashingFs{Fs: delegate, hashReceiver: hashReceiver}
}
func (fs *md5HashingFs) Create(name string) (afero.File, error) {
f, err := fs.Fs.Create(name)
if err == nil {
f = fs.wrapFile(f)
}
return f, err
}
func (fs *md5HashingFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
f, err := fs.Fs.OpenFile(name, flag, perm)
if err == nil && isWrite(flag) {
f = fs.wrapFile(f)
}
return f, err
}
func (fs *md5HashingFs) wrapFile(f afero.File) afero.File {
return &hashingFile{File: f, h: md5.New(), hashReceiver: fs.hashReceiver}
}
func (fs *md5HashingFs) Name() string {
return "md5HashingFs"
}
type hashingFile struct {
hashReceiver FileHashReceiver
h hash.Hash
afero.File
}
func (h *hashingFile) Write(p []byte) (n int, err error) {
n, err = h.File.Write(p)
if err != nil {
return
}
return h.h.Write(p)
}
func (h *hashingFile) Close() error {
sum := hex.EncodeToString(h.h.Sum(nil))
h.hashReceiver.OnFileClose(h.Name(), sum)
return h.File.Close()
}