hugo/hugolib/paths/paths.go
Bjørn Erik Pedersen dea71670c0
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
2018-07-06 11:46:12 +02:00

258 lines
6.5 KiB
Go

// Copyright 2018 The Hugo Authors. All rights reserved.
//
// 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 paths
import (
"fmt"
"path/filepath"
"strings"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/langs"
"github.com/gohugoio/hugo/hugofs"
)
var FilePathSeparator = string(filepath.Separator)
type Paths struct {
Fs *hugofs.Fs
Cfg config.Provider
BaseURL
// If the baseURL contains a base path, e.g. https://example.com/docs, then "/docs" will be the BasePath.
// This will not be set if canonifyURLs is enabled.
BasePath string
// Directories
// TODO(bep) when we have trimmed down mos of the dirs usage outside of this package, make
// these into an interface.
ContentDir string
ThemesDir string
WorkingDir string
// Directories to store Resource related artifacts.
AbsResourcesDir string
AbsPublishDir string
// pagination path handling
PaginatePath string
PublishDir string
DisablePathToLower bool
RemovePathAccents bool
UglyURLs bool
CanonifyURLs bool
Language *langs.Language
Languages langs.Languages
// The PathSpec looks up its config settings in both the current language
// and then in the global Viper config.
// Some settings, the settings listed below, does not make sense to be set
// on per-language-basis. We have no good way of protecting against this
// other than a "white-list". See language.go.
defaultContentLanguageInSubdir bool
DefaultContentLanguage string
multilingual bool
themes []string
AllThemes []ThemeConfig
}
func New(fs *hugofs.Fs, cfg config.Provider) (*Paths, error) {
baseURLstr := cfg.GetString("baseURL")
baseURL, err := newBaseURLFromString(baseURLstr)
if err != nil {
return nil, fmt.Errorf("Failed to create baseURL from %q: %s", baseURLstr, err)
}
contentDir := cfg.GetString("contentDir")
workingDir := cfg.GetString("workingDir")
resourceDir := cfg.GetString("resourceDir")
publishDir := cfg.GetString("publishDir")
if contentDir == "" {
return nil, fmt.Errorf("contentDir not set")
}
if resourceDir == "" {
return nil, fmt.Errorf("resourceDir not set")
}
if publishDir == "" {
return nil, fmt.Errorf("publishDir not set")
}
defaultContentLanguage := cfg.GetString("defaultContentLanguage")
var (
language *langs.Language
languages langs.Languages
)
if l, ok := cfg.(*langs.Language); ok {
language = l
}
if l, ok := cfg.Get("languagesSorted").(langs.Languages); ok {
languages = l
}
if len(languages) == 0 {
// We have some old tests that does not test the entire chain, hence
// they have no languages. So create one so we get the proper filesystem.
languages = langs.Languages{&langs.Language{Lang: "en", Cfg: cfg, ContentDir: contentDir}}
}
absPublishDir := AbsPathify(workingDir, publishDir)
if !strings.HasSuffix(absPublishDir, FilePathSeparator) {
absPublishDir += FilePathSeparator
}
// If root, remove the second '/'
if absPublishDir == "//" {
absPublishDir = FilePathSeparator
}
absResourcesDir := AbsPathify(workingDir, resourceDir)
if !strings.HasSuffix(absResourcesDir, FilePathSeparator) {
absResourcesDir += FilePathSeparator
}
if absResourcesDir == "//" {
absResourcesDir = FilePathSeparator
}
p := &Paths{
Fs: fs,
Cfg: cfg,
BaseURL: baseURL,
DisablePathToLower: cfg.GetBool("disablePathToLower"),
RemovePathAccents: cfg.GetBool("removePathAccents"),
UglyURLs: cfg.GetBool("uglyURLs"),
CanonifyURLs: cfg.GetBool("canonifyURLs"),
ContentDir: contentDir,
ThemesDir: cfg.GetString("themesDir"),
WorkingDir: workingDir,
AbsResourcesDir: absResourcesDir,
AbsPublishDir: absPublishDir,
themes: config.GetStringSlicePreserveString(cfg, "theme"),
multilingual: cfg.GetBool("multilingual"),
defaultContentLanguageInSubdir: cfg.GetBool("defaultContentLanguageInSubdir"),
DefaultContentLanguage: defaultContentLanguage,
Language: language,
Languages: languages,
PaginatePath: cfg.GetString("paginatePath"),
}
if cfg.IsSet("allThemes") {
p.AllThemes = cfg.Get("allThemes").([]ThemeConfig)
} else {
p.AllThemes, err = collectThemeNames(p)
if err != nil {
return nil, err
}
}
// TODO(bep) remove this, eventually
p.PublishDir = absPublishDir
return p, nil
}
func (p *Paths) Lang() string {
if p == nil || p.Language == nil {
return ""
}
return p.Language.Lang
}
// ThemeSet checks whether a theme is in use or not.
func (p *Paths) ThemeSet() bool {
return len(p.themes) > 0
}
func (p *Paths) Themes() []string {
return p.themes
}
func (p *Paths) GetTargetLanguageBasePath() string {
if p.Languages.IsMultihost() {
// In a multihost configuration all assets will be published below the language code.
return p.Lang()
}
return p.GetLanguagePrefix()
}
func (p *Paths) GetURLLanguageBasePath() string {
if p.Languages.IsMultihost() {
return ""
}
return p.GetLanguagePrefix()
}
func (p *Paths) GetLanguagePrefix() string {
if !p.multilingual {
return ""
}
defaultLang := p.DefaultContentLanguage
defaultInSubDir := p.defaultContentLanguageInSubdir
currentLang := p.Language.Lang
if currentLang == "" || (currentLang == defaultLang && !defaultInSubDir) {
return ""
}
return currentLang
}
// GetLangSubDir returns the given language's subdir if needed.
func (p *Paths) GetLangSubDir(lang string) string {
if !p.multilingual {
return ""
}
if p.Languages.IsMultihost() {
return ""
}
if lang == "" || (lang == p.DefaultContentLanguage && !p.defaultContentLanguageInSubdir) {
return ""
}
return lang
}
// AbsPathify creates an absolute path if given a relative path. If already
// absolute, the path is just cleaned.
func (p *Paths) AbsPathify(inPath string) string {
return AbsPathify(p.WorkingDir, inPath)
}
// AbsPathify creates an absolute path if given a working dir and arelative path.
// If already absolute, the path is just cleaned.
func AbsPathify(workingDir, inPath string) string {
if filepath.IsAbs(inPath) {
return filepath.Clean(inPath)
}
return filepath.Join(workingDir, inPath)
}