hugo/resources/resource_transformers/js/build.go

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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 js
import (
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"github.com/pkg/errors"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/hugofs"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/hugolib/filesystems"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/resources/internal"
"github.com/evanw/esbuild/pkg/api"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/resource"
)
// Client context for ESBuild.
type Client struct {
rs *resources.Spec
sfs *filesystems.SourceFilesystem
}
// New creates a new client context.
func New(fs *filesystems.SourceFilesystem, rs *resources.Spec) *Client {
return &Client{
rs: rs,
sfs: fs,
}
}
type buildTransformation struct {
optsm map[string]any
c *Client
}
func (t *buildTransformation) Key() internal.ResourceTransformationKey {
return internal.NewResourceTransformationKey("jsbuild", t.optsm)
}
func (t *buildTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
ctx.OutMediaType = media.JavascriptType
opts, err := decodeOptions(t.optsm)
if err != nil {
return err
}
if opts.TargetPath != "" {
ctx.OutPath = opts.TargetPath
} else {
ctx.ReplaceOutPathExtension(".js")
}
src, err := ioutil.ReadAll(ctx.From)
if err != nil {
return err
}
opts.sourceDir = filepath.FromSlash(path.Dir(ctx.SourcePath))
opts.resolveDir = t.c.rs.WorkingDir // where node_modules gets resolved
opts.contents = string(src)
opts.mediaType = ctx.InMediaType
buildOptions, err := toBuildOptions(opts)
if err != nil {
return err
}
buildOptions.Plugins, err = createBuildPlugins(t.c, opts)
if err != nil {
return err
}
if buildOptions.Sourcemap == api.SourceMapExternal && buildOptions.Outdir == "" {
buildOptions.Outdir, err = ioutil.TempDir(os.TempDir(), "compileOutput")
if err != nil {
return err
}
defer os.Remove(buildOptions.Outdir)
}
if opts.Inject != nil {
// Resolve the absolute filenames.
for i, ext := range opts.Inject {
impPath := filepath.FromSlash(ext)
if filepath.IsAbs(impPath) {
return errors.Errorf("inject: absolute paths not supported, must be relative to /assets")
}
m := resolveComponentInAssets(t.c.rs.Assets.Fs, impPath)
if m == nil {
return errors.Errorf("inject: file %q not found", ext)
}
opts.Inject[i] = m.Filename
}
buildOptions.Inject = opts.Inject
}
result := api.Build(buildOptions)
if len(result.Errors) > 0 {
createErr := func(msg api.Message) error {
loc := msg.Location
if loc == nil {
return errors.New(msg.Text)
}
path := loc.File
var (
f afero.File
err error
)
if strings.HasPrefix(path, nsImportHugo) {
path = strings.TrimPrefix(path, nsImportHugo+":")
f, err = hugofs.Os.Open(path)
} else {
var fi os.FileInfo
fi, err = t.c.sfs.Fs.Stat(path)
if err == nil {
m := fi.(hugofs.FileMetaInfo).Meta()
path = m.Filename
f, err = m.Open()
}
}
if err == nil {
fe := herrors.NewFileError("js", 0, loc.Line, loc.Column, errors.New(msg.Text))
err, _ := herrors.WithFileContext(fe, path, f, herrors.SimpleLineMatcher)
f.Close()
return err
}
return fmt.Errorf("%s", msg.Text)
}
var errors []error
for _, msg := range result.Errors {
errors = append(errors, createErr(msg))
}
// Return 1, log the rest.
for i, err := range errors {
if i > 0 {
t.c.rs.Logger.Errorf("js.Build failed: %s", err)
}
}
return errors[0]
}
if buildOptions.Sourcemap == api.SourceMapExternal {
content := string(result.OutputFiles[1].Contents)
symPath := path.Base(ctx.OutPath) + ".map"
re := regexp.MustCompile(`//# sourceMappingURL=.*\n?`)
content = re.ReplaceAllString(content, "//# sourceMappingURL="+symPath+"\n")
if err = ctx.PublishSourceMap(string(result.OutputFiles[0].Contents)); err != nil {
return err
}
_, err := ctx.To.Write([]byte(content))
if err != nil {
return err
}
} else {
_, err := ctx.To.Write(result.OutputFiles[0].Contents)
if err != nil {
return err
}
}
return nil
}
// Process process esbuild transform
func (c *Client) Process(res resources.ResourceTransformer, opts map[string]any) (resource.Resource, error) {
return res.Transform(
&buildTransformation{c: c, optsm: opts},
)
}