2019-08-16 09:55:03 -04:00
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// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package rst converts content to HTML using the RST external helper.
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package rst
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import (
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"bytes"
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"os/exec"
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"runtime"
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2019-11-27 07:42:36 -05:00
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"github.com/gohugoio/hugo/identity"
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2019-08-16 09:55:03 -04:00
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"github.com/gohugoio/hugo/markup/internal"
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"github.com/gohugoio/hugo/markup/converter"
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)
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// Provider is the package entry point.
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2019-11-06 14:10:47 -05:00
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var Provider converter.ProviderProvider = provider{}
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2019-08-16 09:55:03 -04:00
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type provider struct {
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}
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func (p provider) New(cfg converter.ProviderConfig) (converter.Provider, error) {
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2019-11-06 14:10:47 -05:00
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return converter.NewProvider("rst", func(ctx converter.DocumentContext) (converter.Converter, error) {
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2019-08-16 09:55:03 -04:00
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return &rstConverter{
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ctx: ctx,
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cfg: cfg,
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}, nil
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2019-11-06 14:10:47 -05:00
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}), nil
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2019-08-16 09:55:03 -04:00
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}
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type rstConverter struct {
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ctx converter.DocumentContext
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cfg converter.ProviderConfig
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}
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func (c *rstConverter) Convert(ctx converter.RenderContext) (converter.Result, error) {
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return converter.Bytes(c.getRstContent(ctx.Src, c.ctx)), nil
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}
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2019-11-27 07:42:36 -05:00
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func (c *rstConverter) Supports(feature identity.Identity) bool {
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return false
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}
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2019-08-16 09:55:03 -04:00
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// getRstContent calls the Python script rst2html as an external helper
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// to convert reStructuredText content to HTML.
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func (c *rstConverter) getRstContent(src []byte, ctx converter.DocumentContext) []byte {
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logger := c.cfg.Logger
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path := getRstExecPath()
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if path == "" {
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logger.ERROR.Println("rst2html / rst2html.py not found in $PATH: Please install.\n",
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" Leaving reStructuredText content unrendered.")
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return src
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}
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logger.INFO.Println("Rendering", ctx.DocumentName, "with", path, "...")
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var result []byte
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// certain *nix based OSs wrap executables in scripted launchers
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// invoking binaries on these OSs via python interpreter causes SyntaxError
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// invoke directly so that shebangs work as expected
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// handle Windows manually because it doesn't do shebangs
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if runtime.GOOS == "windows" {
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python := internal.GetPythonExecPath()
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args := []string{path, "--leave-comments", "--initial-header-level=2"}
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result = internal.ExternallyRenderContent(c.cfg, ctx, src, python, args)
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} else {
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args := []string{"--leave-comments", "--initial-header-level=2"}
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result = internal.ExternallyRenderContent(c.cfg, ctx, src, path, args)
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}
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// TODO(bep) check if rst2html has a body only option.
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bodyStart := bytes.Index(result, []byte("<body>\n"))
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if bodyStart < 0 {
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bodyStart = -7 //compensate for length
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}
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bodyEnd := bytes.Index(result, []byte("\n</body>"))
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if bodyEnd < 0 || bodyEnd >= len(result) {
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bodyEnd = len(result) - 1
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if bodyEnd < 0 {
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bodyEnd = 0
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}
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}
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return result[bodyStart+7 : bodyEnd]
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}
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func getRstExecPath() string {
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path, err := exec.LookPath("rst2html")
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if err != nil {
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path, err = exec.LookPath("rst2html.py")
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if err != nil {
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return ""
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}
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}
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return path
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}
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// Supports returns whether rst is installed on this computer.
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func Supports() bool {
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return getRstExecPath() != ""
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}
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