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// Copyright 2017 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 source
import (
"errors"
"os"
"path/filepath"
"strings"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/hugofs"
jww "github.com/spf13/jwalterweatherman"
)
// Dirs holds the source directories for a given build.
// In case where there are more than one of a kind, the order matters:
// It will be used to construct a union filesystem, so the right-most directory
// will "win" on duplicates. Typically, the theme version will be the first.
type Dirs struct {
logger *jww.Notepad
pathSpec *helpers.PathSpec
staticDirs []string
AbsStaticDirs []string
Language *helpers.Language
}
// NewDirs creates a new dirs with the given configuration and filesystem.
func NewDirs(fs *hugofs.Fs, cfg config.Provider, logger *jww.Notepad) (*Dirs, error) {
ps, err := helpers.NewPathSpec(fs, cfg)
if err != nil {
return nil, err
}
var l *helpers.Language
if language, ok := cfg.(*helpers.Language); ok {
l = language
}
d := &Dirs{Language: l, pathSpec: ps, logger: logger}
return d, d.init(cfg)
}
func (d *Dirs) init(cfg config.Provider) error {
var (
statics []string
)
if d.pathSpec.Theme() != "" {
statics = append(statics, filepath.Join(d.pathSpec.ThemesDir(), d.pathSpec.Theme(), "static"))
}
_, isLanguage := cfg.(*helpers.Language)
languages, hasLanguages := cfg.Get("languagesSorted").(helpers.Languages)
if !isLanguage && !hasLanguages {
return errors.New("missing languagesSorted in config")
}
if !isLanguage {
// Merge all the static dirs.
for _, l := range languages {
addend, err := d.staticDirsFor(l)
if err != nil {
return err
}
statics = append(statics, addend...)
}
} else {
addend, err := d.staticDirsFor(cfg)
if err != nil {
return err
}
statics = append(statics, addend...)
}
d.staticDirs = removeDuplicatesKeepRight(statics)
d.AbsStaticDirs = make([]string, len(d.staticDirs))
for i, di := range d.staticDirs {
d.AbsStaticDirs[i] = d.pathSpec.AbsPathify(di) + helpers.FilePathSeparator
}
return nil
}
func (d *Dirs) staticDirsFor(cfg config.Provider) ([]string, error) {
var statics []string
ps, err := helpers.NewPathSpec(d.pathSpec.Fs, cfg)
if err != nil {
return statics, err
}
statics = append(statics, ps.StaticDirs()...)
return statics, nil
}
// CreateStaticFs will create a union filesystem with the static paths configured.
// Any missing directories will be logged as warnings.
func (d *Dirs) CreateStaticFs() (afero.Fs, error) {
var (
source = d.pathSpec.Fs.Source
absPaths []string
)
for _, staticDir := range d.AbsStaticDirs {
if _, err := source.Stat(staticDir); os.IsNotExist(err) {
d.logger.WARN.Printf("Unable to find Static Directory: %s", staticDir)
} else {
absPaths = append(absPaths, staticDir)
}
}
if len(absPaths) == 0 {
return nil, nil
}
return d.createOverlayFs(absPaths), nil
}
// IsStatic returns whether the given filename is located in one of the static
// source dirs.
func (d *Dirs) IsStatic(filename string) bool {
for _, absPath := range d.AbsStaticDirs {
if strings.HasPrefix(filename, absPath) {
return true
}
}
return false
}
// MakeStaticPathRelative creates a relative path from the given filename.
// It will return an empty string if the filename is not a member of dirs.
func (d *Dirs) MakeStaticPathRelative(filename string) string {
for _, currentPath := range d.AbsStaticDirs {
if strings.HasPrefix(filename, currentPath) {
return strings.TrimPrefix(filename, currentPath)
}
}
return ""
}
func (d *Dirs) createOverlayFs(absPaths []string) afero.Fs {
source := d.pathSpec.Fs.Source
if len(absPaths) == 1 {
return afero.NewReadOnlyFs(afero.NewBasePathFs(source, absPaths[0]))
}
base := afero.NewReadOnlyFs(afero.NewBasePathFs(source, absPaths[0]))
overlay := d.createOverlayFs(absPaths[1:])
return afero.NewCopyOnWriteFs(base, overlay)
}
func removeDuplicatesKeepRight(in []string) []string {
seen := make(map[string]bool)
var out []string
for i := len(in) - 1; i >= 0; i-- {
v := in[i]
if seen[v] {
continue
}
out = append([]string{v}, out...)
seen[v] = true
}
return out
}
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