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// 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.
// +build extended
package scss
import (
"fmt"
"io"
"path"
"path/filepath"
"strings"
"github.com/bep/go-tocss/scss"
"github.com/bep/go-tocss/scss/libsass"
"github.com/bep/go-tocss/tocss"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/hugofs"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/resources"
"github.com/pkg/errors"
)
// Used in tests. This feature requires Hugo to be built with the extended tag.
func Supports() bool {
return true
}
func (t *toCSSTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
ctx.OutMediaType = media.CSSType
var outName string
if t.options.from.TargetPath != "" {
ctx.OutPath = t.options.from.TargetPath
} else {
ctx.ReplaceOutPathExtension(".css")
}
outName = path.Base(ctx.OutPath)
options := t.options
baseDir := path.Dir(ctx.SourcePath)
options.to.IncludePaths = t.c.sfs.RealDirs(baseDir)
// Append any workDir relative include paths
for _, ip := range options.from.IncludePaths {
info, err := t.c.workFs.Stat(filepath.Clean(ip))
if err == nil {
filename := info.(hugofs.FileMetaInfo).Meta().Filename()
options.to.IncludePaths = append(options.to.IncludePaths, filename)
}
}
// To allow for overrides of SCSS files anywhere in the project/theme hierarchy, we need
// to help libsass revolve the filename by looking in the composite filesystem first.
// We add the entry directories for both project and themes to the include paths list, but
// that only work for overrides on the top level.
options.to.ImportResolver = func(url string, prev string) (newUrl string, body string, resolved bool) {
// We get URL paths from LibSASS, but we need file paths.
url = filepath.FromSlash(url)
prev = filepath.FromSlash(prev)
var basePath string
urlDir := filepath.Dir(url)
var prevDir string
if prev == "stdin" {
prevDir = baseDir
} else {
prevDir = t.c.sfs.MakePathRelative(filepath.Dir(prev))
if prevDir == "" {
// Not a member of this filesystem. Let LibSASS handle it.
return "", "", false
}
}
basePath = filepath.Join(prevDir, urlDir)
name := filepath.Base(url)
// Libsass throws an error in cases where you have several possible candidates.
// We make this simpler and pick the first match.
var namePatterns []string
if strings.Contains(name, ".") {
namePatterns = []string{"_%s", "%s"}
} else if strings.HasPrefix(name, "_") {
namePatterns = []string{"_%s.scss", "_%s.sass"}
} else {
namePatterns = []string{"_%s.scss", "%s.scss", "_%s.sass", "%s.sass"}
}
name = strings.TrimPrefix(name, "_")
for _, namePattern := range namePatterns {
filenameToCheck := filepath.Join(basePath, fmt.Sprintf(namePattern, name))
fi, err := t.c.sfs.Fs.Stat(filenameToCheck)
if err == nil {
if fim, ok := fi.(hugofs.FileMetaInfo); ok {
return fim.Meta().Filename(), "", true
}
}
}
// Not found, let LibSASS handle it
return "", "", false
}
if ctx.InMediaType.SubType == media.SASSType.SubType {
options.to.SassSyntax = true
}
if options.from.EnableSourceMap {
options.to.SourceMapFilename = outName + ".map"
options.to.SourceMapRoot = t.c.rs.WorkingDir
// Setting this to the relative input filename will get the source map
// more correct for the main entry path (main.scss typically), but
// it will mess up the import mappings. As a workaround, we do a replacement
// in the source map itself (see below).
//options.InputPath = inputPath
options.to.OutputPath = outName
options.to.SourceMapContents = true
options.to.OmitSourceMapURL = false
options.to.EnableEmbeddedSourceMap = false
}
res, err := t.c.toCSS(options.to, ctx.To, ctx.From)
if err != nil {
return err
}
if options.from.EnableSourceMap && res.SourceMapContent != "" {
sourcePath := t.c.sfs.RealFilename(ctx.SourcePath)
if strings.HasPrefix(sourcePath, t.c.rs.WorkingDir) {
sourcePath = strings.TrimPrefix(sourcePath, t.c.rs.WorkingDir+helpers.FilePathSeparator)
}
// This needs to be Unix-style slashes, even on Windows.
// See https://github.com/gohugoio/hugo/issues/4968
sourcePath = filepath.ToSlash(sourcePath)
// This is a workaround for what looks like a bug in Libsass. But
// getting this resolution correct in tools like Chrome Workspaces
// is important enough to go this extra mile.
mapContent := strings.Replace(res.SourceMapContent, `stdin",`, fmt.Sprintf("%s\",", sourcePath), 1)
return ctx.PublishSourceMap(mapContent)
}
return nil
}
func (c *Client) toCSS(options scss.Options, dst io.Writer, src io.Reader) (tocss.Result, error) {
var res tocss.Result
transpiler, err := libsass.New(options)
if err != nil {
return res, err
}
res, err = transpiler.Execute(dst, src)
if err != nil {
return res, errors.Wrap(err, "SCSS processing failed")
}
return res, nil
}
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