diff options
author | Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com> | 2020-04-28 14:02:41 +0200 |
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committer | Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com> | 2020-04-29 10:51:33 +0200 |
commit | 6add6d77b48cf0aab8b39d7a2bddedb1aa2a52b8 (patch) | |
tree | c096c3421db8932e6d06eca533646c58b5ddaa93 /resources/resource_transformers/babel | |
parent | 2a171ff1c5d9b1603fe78c67d2d894bb2efccc8b (diff) |
Rename transpileJS to babel
And add a test.
Updates #5764
Diffstat (limited to 'resources/resource_transformers/babel')
-rw-r--r-- | resources/resource_transformers/babel/babel.go | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/resources/resource_transformers/babel/babel.go b/resources/resource_transformers/babel/babel.go new file mode 100644 index 000000000..fc9650aa0 --- /dev/null +++ b/resources/resource_transformers/babel/babel.go @@ -0,0 +1,186 @@ +// 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 babel + +import ( + "io" + "os" + "os/exec" + "path/filepath" + "strconv" + + "github.com/gohugoio/hugo/common/hugo" + "github.com/gohugoio/hugo/resources/internal" + + "github.com/mitchellh/mapstructure" + + "github.com/gohugoio/hugo/common/herrors" + "github.com/gohugoio/hugo/hugofs" + "github.com/gohugoio/hugo/resources" + "github.com/gohugoio/hugo/resources/resource" + "github.com/pkg/errors" +) + +// Options from https://babeljs.io/docs/en/options +type Options struct { + Config string // Custom path to config file + + Minified bool + NoComments bool + Compact *bool + Verbose bool + NoBabelrc bool +} + +func DecodeOptions(m map[string]interface{}) (opts Options, err error) { + if m == nil { + return + } + err = mapstructure.WeakDecode(m, &opts) + return +} +func (opts Options) toArgs() []string { + var args []string + + if opts.Minified { + args = append(args, "--minified") + } + if opts.NoComments { + args = append(args, "--no-comments") + } + if opts.Compact != nil { + args = append(args, "--compact="+strconv.FormatBool(*opts.Compact)) + } + if opts.Verbose { + args = append(args, "--verbose") + } + if opts.NoBabelrc { + args = append(args, "--no-babelrc") + } + return args +} + +// Client is the client used to do Babel transformations. +type Client struct { + rs *resources.Spec +} + +// New creates a new Client with the given specification. +func New(rs *resources.Spec) *Client { + return &Client{rs: rs} +} + +type babelTransformation struct { + options Options + rs *resources.Spec +} + +func (t *babelTransformation) Key() internal.ResourceTransformationKey { + return internal.NewResourceTransformationKey("babel", t.options) +} + +// Transform shells out to babel-cli to do the heavy lifting. +// For this to work, you need some additional tools. To install them globally: +// npm install -g @babel/core @babel/cli +// If you want to use presets or plugins such as @babel/preset-env +// Then you should install those globally as well. e.g: +// npm install -g @babel/preset-env +// Instead of installing globally, you can also install everything as a dev-dependency (--save-dev instead of -g) +func (t *babelTransformation) Transform(ctx *resources.ResourceTransformationCtx) error { + const localBabelPath = "node_modules/@babel/cli/bin/" + const binaryName = "babel.js" + + // Try first in the project's node_modules. + csiBinPath := filepath.Join(t.rs.WorkingDir, localBabelPath, binaryName) + + binary := csiBinPath + + if _, err := exec.LookPath(binary); err != nil { + // Try PATH + binary = binaryName + if _, err := exec.LookPath(binary); err != nil { + + // This may be on a CI server etc. Will fall back to pre-built assets. + return herrors.ErrFeatureNotAvailable + } + } + + var configFile string + logger := t.rs.Logger + + if t.options.Config != "" { + configFile = t.options.Config + } else { + configFile = "babel.config.js" + } + + configFile = filepath.Clean(configFile) + + // We need an abolute filename to the config file. + if !filepath.IsAbs(configFile) { + // We resolve this against the virtual Work filesystem, to allow + // this config file to live in one of the themes if needed. + fi, err := t.rs.BaseFs.Work.Stat(configFile) + if err != nil { + if t.options.Config != "" { + // Only fail if the user specificed config file is not found. + return errors.Wrapf(err, "babel config %q not found:", configFile) + } + } else { + configFile = fi.(hugofs.FileMetaInfo).Meta().Filename() + } + } + + var cmdArgs []string + + if configFile != "" { + logger.INFO.Println("babel: use config file", configFile) + cmdArgs = []string{"--config-file", configFile} + } + + if optArgs := t.options.toArgs(); len(optArgs) > 0 { + cmdArgs = append(cmdArgs, optArgs...) + } + cmdArgs = append(cmdArgs, "--filename="+ctx.SourcePath) + + cmd := exec.Command(binary, cmdArgs...) + + cmd.Stdout = ctx.To + cmd.Stderr = os.Stderr + cmd.Env = hugo.GetExecEnviron(t.rs.Cfg) + + stdin, err := cmd.StdinPipe() + if err != nil { + return err + } + + go func() { + defer stdin.Close() + io.Copy(stdin, ctx.From) + }() + + err = cmd.Run() + if err != nil { + return err + } + + return nil +} + +// Process transforms the given Resource with the Babel processor. +func (c *Client) Process(res resources.ResourceTransformer, options Options) (resource.Resource, error) { + return res.Transform( + &babelTransformation{rs: c.rs, options: options}, + ) +} |