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dea71670c0
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
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package hugofs
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import (
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"crypto/md5"
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"encoding/hex"
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"hash"
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"os"
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"github.com/spf13/afero"
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)
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var (
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_ afero.Fs = (*md5HashingFs)(nil)
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)
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// FileHashReceiver will receive the filename an the content's MD5 sum on file close.
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type FileHashReceiver interface {
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OnFileClose(name, md5sum string)
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}
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type md5HashingFs struct {
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afero.Fs
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hashReceiver FileHashReceiver
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}
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// NewHashingFs creates a new filesystem that will receive MD5 checksums of
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// any written file content on Close. Note that this is probably not a good
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// idea for "full build" situations, but when doing fast render mode, the amount
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// of files published is low, and it would be really nice to know exactly which
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// of these files where actually changed.
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// Note that this will only work for file operations that use the io.Writer
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// to write content to file, but that is fine for the "publish content" use case.
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func NewHashingFs(delegate afero.Fs, hashReceiver FileHashReceiver) afero.Fs {
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return &md5HashingFs{Fs: delegate, hashReceiver: hashReceiver}
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}
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func (fs *md5HashingFs) Create(name string) (afero.File, error) {
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f, err := fs.Fs.Create(name)
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if err == nil {
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f = fs.wrapFile(f)
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}
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return f, err
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}
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func (fs *md5HashingFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
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f, err := fs.Fs.OpenFile(name, flag, perm)
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if err == nil && isWrite(flag) {
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f = fs.wrapFile(f)
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}
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return f, err
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}
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func (fs *md5HashingFs) wrapFile(f afero.File) afero.File {
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return &hashingFile{File: f, h: md5.New(), hashReceiver: fs.hashReceiver}
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}
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func isWrite(flag int) bool {
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return flag&os.O_RDWR != 0 || flag&os.O_WRONLY != 0
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}
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func (fs *md5HashingFs) Name() string {
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return "md5HashingFs"
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}
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type hashingFile struct {
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hashReceiver FileHashReceiver
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h hash.Hash
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afero.File
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}
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func (h *hashingFile) Write(p []byte) (n int, err error) {
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n, err = h.File.Write(p)
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if err != nil {
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return
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}
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return h.h.Write(p)
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}
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func (h *hashingFile) Close() error {
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sum := hex.EncodeToString(h.h.Sum(nil))
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h.hashReceiver.OnFileClose(h.Name(), sum)
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return h.File.Close()
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}
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