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// Copyright 2020 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 godartsass integrates with the Dass Sass Embedded protocol to transpile
// SCSS/SASS.
package dartsass
import (
"fmt"
"io"
"strings"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/hugofs"
"github.com/gohugoio/hugo/hugolib/filesystems"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/resource"
"github.com/spf13/afero"
"github.com/bep/godartsass"
"github.com/mitchellh/mapstructure"
)
// used as part of the cache key.
const transformationName = "tocss-dart"
// See https://github.com/sass/dart-sass-embedded/issues/24
// Note: This prefix must be all lower case.
const dartSassStdinPrefix = "hugostdin:"
func New(fs *filesystems.SourceFilesystem, rs *resources.Spec) (*Client, error) {
if !Supports() {
return &Client{dartSassNotAvailable: true}, nil
}
if err := rs.ExecHelper.Sec().CheckAllowedExec(dartSassEmbeddedBinaryName); err != nil {
return nil, err
}
transpiler, err := godartsass.Start(godartsass.Options{
LogEventHandler: func(event godartsass.LogEvent) {
message := strings.ReplaceAll(event.Message, dartSassStdinPrefix, "")
switch event.Type {
case godartsass.LogEventTypeDebug:
// Log as Info for now, we may adjust this if it gets too chatty.
rs.Logger.Infof("Dart Sass: %s", message)
default:
// The rest are either deprecations or @warn statements.
rs.Logger.Warnf("Dart Sass: %s", message)
}
},
})
if err != nil {
return nil, err
}
return &Client{sfs: fs, workFs: rs.BaseFs.Work, rs: rs, transpiler: transpiler}, nil
}
type Client struct {
dartSassNotAvailable bool
rs *resources.Spec
sfs *filesystems.SourceFilesystem
workFs afero.Fs
transpiler *godartsass.Transpiler
}
func (c *Client) ToCSS(res resources.ResourceTransformer, args map[string]any) (resource.Resource, error) {
if c.dartSassNotAvailable {
return res.Transform(resources.NewFeatureNotAvailableTransformer(transformationName, args))
}
return res.Transform(&transform{c: c, optsm: args})
}
func (c *Client) Close() error {
if c.transpiler == nil {
return nil
}
return c.transpiler.Close()
}
func (c *Client) toCSS(args godartsass.Args, src io.Reader) (godartsass.Result, error) {
var res godartsass.Result
in := helpers.ReaderToString(src)
args.Source = in
res, err := c.transpiler.Execute(args)
if err != nil {
if err.Error() == "unexpected EOF" {
return res, fmt.Errorf("got unexpected EOF when executing %q. The user running hugo must have read and execute permissions on this program. With execute permissions only, this error is thrown.", dartSassEmbeddedBinaryName)
}
return res, herrors.NewFileErrorFromFileInErr(err, hugofs.Os, herrors.OffsetMatcher)
}
return res, err
}
type Options struct {
// Hugo, will by default, just replace the extension of the source
// to .css, e.g. "scss/main.scss" becomes "scss/main.css". You can
// control this by setting this, e.g. "styles/main.css" will create
// a Resource with that as a base for RelPermalink etc.
TargetPath string
// Hugo automatically adds the entry directories (where the main.scss lives)
// for project and themes to the list of include paths sent to LibSASS.
// Any paths set in this setting will be appended. Note that these will be
// treated as relative to the working dir, i.e. no include paths outside the
// project/themes.
IncludePaths []string
// Default is nested.
// One of nested, expanded, compact, compressed.
OutputStyle string
// When enabled, Hugo will generate a source map.
EnableSourceMap bool
// If enabled, sources will be embedded in the generated source map.
SourceMapIncludeSources bool
// Vars will be available in 'hugo:vars', e.g:
// @use "hugo:vars";
// $color: vars.$color;
Vars map[string]any
}
func decodeOptions(m map[string]any) (opts Options, err error) {
if m == nil {
return
}
err = mapstructure.WeakDecode(m, &opts)
if opts.TargetPath != "" {
opts.TargetPath = helpers.ToSlashTrimLeading(opts.TargetPath)
}
return
}
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