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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.
package scss
import (
"github.com/bep/go-tocss/scss"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/hugolib/filesystems"
"github.com/gohugoio/hugo/resource"
"github.com/mitchellh/mapstructure"
)
type Client struct {
rs *resource.Spec
sfs *filesystems.SourceFilesystem
workFs *filesystems.SourceFilesystem
}
func New(fs *filesystems.SourceFilesystem, rs *resource.Spec) (*Client, error) {
return &Client{sfs: fs, workFs: rs.BaseFs.Work, rs: rs}, nil
}
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
// Precision of floating point math.
Precision int
// When enabled, Hugo will generate a source map.
EnableSourceMap bool
}
type options struct {
// The options we receive from the end user.
from Options
// The options we send to the SCSS library.
to scss.Options
}
func (c *Client) ToCSS(res resource.Resource, opts Options) (resource.Resource, error) {
internalOptions := options{
from: opts,
}
// Transfer values from client.
internalOptions.to.Precision = opts.Precision
internalOptions.to.OutputStyle = scss.OutputStyleFromString(opts.OutputStyle)
if internalOptions.to.Precision == 0 {
// bootstrap-sass requires 8 digits precision. The libsass default is 5.
// https://github.com/twbs/bootstrap-sass/blob/master/README.md#sass-number-precision
internalOptions.to.Precision = 8
}
return c.rs.Transform(
res,
&toCSSTransformation{c: c, options: internalOptions},
)
}
type toCSSTransformation struct {
c *Client
options options
}
func (t *toCSSTransformation) Key() resource.ResourceTransformationKey {
return resource.NewResourceTransformationKey("tocss", t.options.from)
}
func DecodeOptions(m map[string]interface{}) (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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