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// Copyright 2024 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 cssjs provides resource transformations backed by some popular JS based frameworks.
package cssjs
import (
"bytes"
"fmt"
"io"
"path/filepath"
"strings"
"github.com/gohugoio/hugo/common/collections"
"github.com/gohugoio/hugo/common/hexec"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/common/hugo"
"github.com/gohugoio/hugo/resources/internal"
"github.com/spf13/cast"
"github.com/mitchellh/mapstructure"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/resource"
)
// NewPostCSSClient creates a new PostCSSClient with the given specification.
func NewPostCSSClient(rs *resources.Spec) *PostCSSClient {
return &PostCSSClient{rs: rs}
}
func decodePostCSSOptions(m map[string]any) (opts PostCSSOptions, err error) {
if m == nil {
return
}
err = mapstructure.WeakDecode(m, &opts)
if !opts.NoMap {
// There was for a long time a discrepancy between documentation and
// implementation for the noMap property, so we need to support both
// camel and snake case.
opts.NoMap = cast.ToBool(m["no-map"])
}
return
}
// PostCSSClient is the client used to do PostCSS transformations.
type PostCSSClient struct {
rs *resources.Spec
}
// Process transforms the given Resource with the PostCSS processor.
func (c *PostCSSClient) Process(res resources.ResourceTransformer, options map[string]any) (resource.Resource, error) {
return res.Transform(&postcssTransformation{rs: c.rs, optionsm: options})
}
type InlineImports struct {
// Service `mapstructure:",squash"`
// Enable inlining of @import statements.
// Does so recursively, but currently once only per file;
// that is, it's not possible to import the same file in
// different scopes (root, media query...)
// Note that this import routine does not care about the CSS spec,
// so you can have @import anywhere in the file.
InlineImports bool
// When InlineImports is enabled, we fail the build if an import cannot be resolved.
// You can enable this to allow the build to continue and leave the import statement in place.
// Note that the inline importer does not process url location or imports with media queries,
// so those will be left as-is even without enabling this option.
SkipInlineImportsNotFound bool
}
// Some of the options from https://github.com/postcss/postcss-cli
type PostCSSOptions struct {
// Set a custom path to look for a config file.
Config string
NoMap bool // Disable the default inline sourcemaps
InlineImports `mapstructure:",squash"`
// Options for when not using a config file
Use string // List of postcss plugins to use
Parser string // Custom postcss parser
Stringifier string // Custom postcss stringifier
Syntax string // Custom postcss syntax
}
func (opts PostCSSOptions) toArgs() []string {
var args []string
if opts.NoMap {
args = append(args, "--no-map")
}
if opts.Use != "" {
args = append(args, "--use")
args = append(args, strings.Fields(opts.Use)...)
}
if opts.Parser != "" {
args = append(args, "--parser", opts.Parser)
}
if opts.Stringifier != "" {
args = append(args, "--stringifier", opts.Stringifier)
}
if opts.Syntax != "" {
args = append(args, "--syntax", opts.Syntax)
}
return args
}
type postcssTransformation struct {
optionsm map[string]any
rs *resources.Spec
}
func (t *postcssTransformation) Key() internal.ResourceTransformationKey {
return internal.NewResourceTransformationKey("postcss", t.optionsm)
}
// Transform shells out to postcss-cli to do the heavy lifting.
// For this to work, you need some additional tools. To install them globally:
// npm install -g postcss-cli
// npm install -g autoprefixer
func (t *postcssTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
const binaryName = "postcss"
infol := t.rs.Logger.InfoCommand(binaryName)
infow := loggers.LevelLoggerToWriter(infol)
ex := t.rs.ExecHelper
var configFile string
options, err := decodePostCSSOptions(t.optionsm)
if err != nil {
return err
}
if options.Config != "" {
configFile = options.Config
} else {
configFile = "postcss.config.js"
}
configFile = filepath.Clean(configFile)
// We need an absolute filename to the config file.
if !filepath.IsAbs(configFile) {
configFile = t.rs.BaseFs.ResolveJSConfigFile(configFile)
if configFile == "" && options.Config != "" {
// Only fail if the user specified config file is not found.
return fmt.Errorf("postcss config %q not found", options.Config)
}
}
var cmdArgs []any
if configFile != "" {
infol.Logf("use config file %q", configFile)
cmdArgs = []any{"--config", configFile}
}
if optArgs := options.toArgs(); len(optArgs) > 0 {
cmdArgs = append(cmdArgs, collections.StringSliceToInterfaceSlice(optArgs)...)
}
var errBuf bytes.Buffer
stderr := io.MultiWriter(infow, &errBuf)
cmdArgs = append(cmdArgs, hexec.WithStderr(stderr))
cmdArgs = append(cmdArgs, hexec.WithStdout(ctx.To))
cmdArgs = append(cmdArgs, hexec.WithEnviron(hugo.GetExecEnviron(t.rs.Cfg.BaseConfig().WorkingDir, t.rs.Cfg, t.rs.BaseFs.Assets.Fs)))
cmd, err := ex.Npx(binaryName, cmdArgs...)
if err != nil {
if hexec.IsNotFound(err) {
// This may be on a CI server etc. Will fall back to pre-built assets.
return &herrors.FeatureNotAvailableError{Cause: err}
}
return err
}
stdin, err := cmd.StdinPipe()
if err != nil {
return err
}
src := ctx.From
imp := newImportResolver(
ctx.From,
ctx.InPath,
options.InlineImports,
t.rs.Assets.Fs, t.rs.Logger, ctx.DependencyManager,
)
if options.InlineImports.InlineImports {
var err error
src, err = imp.resolve()
if err != nil {
return err
}
}
go func() {
defer stdin.Close()
io.Copy(stdin, src)
}()
err = cmd.Run()
if err != nil {
if hexec.IsNotFound(err) {
return &herrors.FeatureNotAvailableError{
Cause: err,
}
}
return imp.toFileError(errBuf.String())
}
return nil
}
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