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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
import (
"bytes"
"io"
"regexp"
"strings"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/common/hexec"
"github.com/gohugoio/hugo/common/hugo"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/internal"
"github.com/gohugoio/hugo/resources/resource"
"github.com/mitchellh/mapstructure"
)
var (
tailwindcssImportRe = regexp.MustCompile(`^tailwindcss/?`)
tailwindImportExclude = func(s string) bool {
return tailwindcssImportRe.MatchString(s) && !strings.Contains(s, ".")
}
)
// NewTailwindCSSClient creates a new TailwindCSSClient with the given specification.
func NewTailwindCSSClient(rs *resources.Spec) *TailwindCSSClient {
return &TailwindCSSClient{rs: rs}
}
// Client is the client used to do TailwindCSS transformations.
type TailwindCSSClient struct {
rs *resources.Spec
}
// Process transforms the given Resource with the TailwindCSS processor.
func (c *TailwindCSSClient) Process(res resources.ResourceTransformer, options map[string]any) (resource.Resource, error) {
return res.Transform(&tailwindcssTransformation{rs: c.rs, optionsm: options})
}
type tailwindcssTransformation struct {
optionsm map[string]any
rs *resources.Spec
}
func (t *tailwindcssTransformation) Key() internal.ResourceTransformationKey {
return internal.NewResourceTransformationKey("tailwindcss", t.optionsm)
}
type TailwindCSSOptions struct {
Minify bool // Optimize and minify the output
Optimize bool // Optimize the output without minifying
InlineImports `mapstructure:",squash"`
}
func (opts TailwindCSSOptions) toArgs() []any {
var args []any
if opts.Minify {
args = append(args, "--minify")
}
if opts.Optimize {
args = append(args, "--optimize")
}
return args
}
func (t *tailwindcssTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
const binaryName = "tailwindcss"
options, err := decodeTailwindCSSOptions(t.optionsm)
if err != nil {
return err
}
infol := t.rs.Logger.InfoCommand(binaryName)
infow := loggers.LevelLoggerToWriter(infol)
ex := t.rs.ExecHelper
workingDir := t.rs.Cfg.BaseConfig().WorkingDir
var cmdArgs []any = []any{
"--input=-", // Read from stdin.
"--cwd", workingDir,
}
cmdArgs = append(cmdArgs, options.toArgs()...)
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(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.DisableInlineImports {
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,
}
}
s := errBuf.String()
if options.InlineImports.DisableInlineImports && strings.Contains(s, "Can't resolve") {
s += "You may want to set the 'disableInlineImports' option to false to inline imports, see https://gohugo.io/functions/css/tailwindcss/#disableinlineimports"
}
return imp.toFileError(s)
}
return nil
}
func decodeTailwindCSSOptions(m map[string]any) (opts TailwindCSSOptions, err error) {
if m == nil {
return
}
err = mapstructure.WeakDecode(m, &opts)
return
}
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