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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 postcss
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"path"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/gohugoio/hugo/common/collections"
"github.com/gohugoio/hugo/common/hexec"
"github.com/gohugoio/hugo/hugofs"
"github.com/gohugoio/hugo/common/hugo"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/resources/internal"
"github.com/spf13/afero"
"github.com/spf13/cast"
"errors"
"github.com/mitchellh/mapstructure"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/resource"
)
const importIdentifier = "@import"
var cssSyntaxErrorRe = regexp.MustCompile(`> (\d+) \|`)
var shouldImportRe = regexp.MustCompile(`^@import ["'].*["'];?\s*(/\*.*\*/)?$`)
// New creates a new Client with the given specification.
func New(rs *resources.Spec) *Client {
return &Client{rs: rs}
}
func DecodeOptions(m map[string]any) (opts Options, 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
}
// Client is the client used to do PostCSS transformations.
type Client struct {
rs *resources.Spec
}
// Process transforms the given Resource with the PostCSS processor.
func (c *Client) Process(res resources.ResourceTransformer, options Options) (resource.Resource, error) {
return res.Transform(&postcssTransformation{rs: c.rs, options: options})
}
// Some of the options from https://github.com/postcss/postcss-cli
type Options struct {
// Set a custom path to look for a config file.
Config string
NoMap bool // Disable the default inline sourcemaps
// 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
// 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 Options) 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 {
options Options
rs *resources.Spec
}
func (t *postcssTransformation) Key() internal.ResourceTransformationKey {
return internal.NewResourceTransformationKey("postcss", t.options)
}
// 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"
ex := t.rs.ExecHelper
var configFile string
logger := t.rs.Logger
if t.options.Config != "" {
configFile = t.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 == "" && t.options.Config != "" {
// Only fail if the user specified config file is not found.
return fmt.Errorf("postcss config %q not found:", configFile)
}
}
var cmdArgs []any
if configFile != "" {
logger.Infoln("postcss: use config file", configFile)
cmdArgs = []any{"--config", configFile}
}
if optArgs := t.options.toArgs(); len(optArgs) > 0 {
cmdArgs = append(cmdArgs, collections.StringSliceToInterfaceSlice(optArgs)...)
}
var errBuf bytes.Buffer
infoW := loggers.LoggerToWriterWithPrefix(logger.Info(), "postcss")
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.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.ErrFeatureNotAvailable
}
return err
}
stdin, err := cmd.StdinPipe()
if err != nil {
return err
}
src := ctx.From
imp := newImportResolver(
ctx.From,
ctx.InPath,
t.rs.Assets.Fs, t.rs.Logger,
)
if t.options.InlineImports {
var err error
src, err = imp.resolve()
if err !=
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