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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 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() != ""
}
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