hugo/markup/asciidocext/convert.go

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Rework external asciidoctor integration This commit solves the relative path problem with asciidoctor tooling. An include will resolve relatively, so you can refer easily to files in the same folder. Also `asciidoctor-diagram` and PlantUML rendering works now, because the created temporary files will be placed in the correct folder. This patch covers just the Ruby version of asciidoctor. The old AsciiDoc CLI EOLs in Jan 2020, so this variant is removed from code. The configuration is completely rewritten and now available in `config.toml` under the key `[markup.asciidocext]`: ```toml [markup.asciidocext] extensions = ["asciidoctor-html5s", "asciidoctor-diagram"] workingFolderCurrent = true trace = true [markup.asciidocext.attributes] my-base-url = "https://example.com/" my-attribute-name = "my value" ``` - backends, safe-modes, and extensions are now whitelisted to the popular (ruby) extensions and valid values. - the default for extensions is to not enable any, because they're all external dependencies so the build would break if the user didn't install them beforehand. - the default backend is html5 because html5s is an external gem dependency. - the default safe-mode is safe, explanations of the modes: https://asciidoctor.org/man/asciidoctor/ - the config is namespaced under asciidocext_config and the parser looks at asciidocext to allow a future native Go asciidoc. - `uglyUrls=true` option and `--source` flag are supported - `--destination` flag is required Follow the updated documentation under `docs/content/en/content-management/formats.md`. This patch would be a breaking change, because you need to correct all your absolute include pathes to relative paths, so using relative paths must be configured explicitly by setting `workingFolderCurrent = true`.
2020-06-25 03:51:33 -04:00
// 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 asciidocext converts Asciidoc to HTML using Asciidoc or Asciidoctor
// external binaries. The `asciidoc` module is reserved for a future golang
// implementation.
package asciidocext
import (
"os/exec"
"path/filepath"
"github.com/gohugoio/hugo/identity"
"github.com/gohugoio/hugo/markup/asciidocext/asciidocext_config"
"github.com/gohugoio/hugo/markup/converter"
"github.com/gohugoio/hugo/markup/internal"
)
/* ToDo: RelPermalink patch for svg posts not working*/
type pageSubset interface {
RelPermalink() string
}
// Provider is the package entry point.
var Provider converter.ProviderProvider = provider{}
type provider struct{}
func (p provider) New(cfg converter.ProviderConfig) (converter.Provider, error) {
return converter.NewProvider("asciidocext", func(ctx converter.DocumentContext) (converter.Converter, error) {
return &asciidocConverter{
ctx: ctx,
cfg: cfg,
}, nil
}), nil
}
type asciidocConverter struct {
ctx converter.DocumentContext
cfg converter.ProviderConfig
}
func (a *asciidocConverter) Convert(ctx converter.RenderContext) (converter.Result, error) {
return converter.Bytes(a.getAsciidocContent(ctx.Src, a.ctx)), nil
}
func (c *asciidocConverter) Supports(feature identity.Identity) bool {
return false
}
// getAsciidocContent calls asciidoctor or asciidoc as an external helper
// to convert AsciiDoc content to HTML.
func (a *asciidocConverter) getAsciidocContent(src []byte, ctx converter.DocumentContext) []byte {
path := getAsciidoctorExecPath()
if path == "" {
a.cfg.Logger.ERROR.Println("asciidoctor / asciidoc not found in $PATH: Please install.\n",
" Leaving AsciiDoc content unrendered.")
return src
}
args := a.parseArgs(ctx)
args = append(args, "--trace")
args = append(args, "-")
a.cfg.Logger.INFO.Println("Rendering", ctx.DocumentName, "with", path, "using asciidoctor args", args, "...")
return internal.ExternallyRenderContent(a.cfg, ctx, src, path, args)
}
func (a *asciidocConverter) parseArgs(ctx converter.DocumentContext) []string {
var cfg = a.cfg.MarkupConfig.AsciidocExt
args := []string{}
if asciidocext_config.AllowedBackend[cfg.Backend] && cfg.Backend != asciidocext_config.Default.Backend {
args = append(args, "-b", cfg.Backend)
}
for _, extension := range cfg.Extensions {
if !asciidocext_config.AllowedExtensions[extension] {
a.cfg.Logger.ERROR.Println("Unsupported asciidoctor extension was passed in. Extension `" + extension + "` ignored.")
continue
}
args = append(args, "-r", extension)
}
for attributeKey, attributeValue := range cfg.Attributes {
if asciidocext_config.DisallowedAttributes[attributeKey] {
a.cfg.Logger.ERROR.Println("Unsupported asciidoctor attribute was passed in. Attribute `" + attributeKey + "` ignored.")
continue
}
args = append(args, "-a", attributeKey+"="+attributeValue)
}
if cfg.WorkingFolderCurrent {
contentDir := filepath.Dir(ctx.Filename)
sourceDir := a.cfg.Cfg.GetString("source")
destinationDir := a.cfg.Cfg.GetString("destination")
if destinationDir == "" {
a.cfg.Logger.ERROR.Println("markup.asciidocext.workingFolderCurrent requires hugo command option --destination to be set")
}
if !filepath.IsAbs(destinationDir) && sourceDir != "" {
destinationDir = filepath.Join(sourceDir, destinationDir)
}
var outDir string
var err error
file := filepath.Base(ctx.Filename)
if a.cfg.Cfg.GetBool("uglyUrls") || file == "_index.adoc" || file == "index.adoc" {
outDir, err = filepath.Abs(filepath.Dir(filepath.Join(destinationDir, ctx.DocumentName)))
} else {
postDir := ""
page, ok := ctx.Document.(pageSubset)
if ok {
postDir = filepath.Base(page.RelPermalink())
} else {
a.cfg.Logger.ERROR.Println("unable to cast interface to pageSubset")
}
outDir, err = filepath.Abs(filepath.Join(destinationDir, filepath.Dir(ctx.DocumentName), postDir))
}
if err != nil {
a.cfg.Logger.ERROR.Println("asciidoctor outDir: ", err)
}
args = append(args, "--base-dir", contentDir, "-a", "outdir="+outDir)
}
if cfg.NoHeaderOrFooter {
args = append(args, "--no-header-footer")
} else {
a.cfg.Logger.WARN.Println("asciidoctor parameter NoHeaderOrFooter is expected for correct html rendering")
}
if cfg.SectionNumbers != asciidocext_config.Default.SectionNumbers {
args = append(args, "--section-numbers")
}
if cfg.Verbose != asciidocext_config.Default.Verbose {
args = append(args, "-v")
}
if cfg.Trace != asciidocext_config.Default.Trace {
args = append(args, "--trace")
}
if asciidocext_config.AllowedFailureLevel[cfg.FailureLevel] && cfg.FailureLevel != asciidocext_config.Default.FailureLevel {
args = append(args, "--failure-level", cfg.FailureLevel)
}
if asciidocext_config.AllowedSafeMode[cfg.SafeMode] && cfg.SafeMode != asciidocext_config.Default.SafeMode {
args = append(args, "--safe-mode", cfg.SafeMode)
}
return args
}
func getAsciidoctorExecPath() string {
path, err := exec.LookPath("asciidoctor")
if err != nil {
return ""
}
return path
}
// Supports returns whether Asciidoctor is installed on this computer.
func Supports() bool {
return getAsciidoctorExecPath() != ""
}