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// Copyright 2019 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 asciidoc converts Asciidoc to HTML using Asciidoc or Asciidoctor
// external binaries.
package asciidoc
import (
"os/exec"
"github.com/gohugoio/hugo/markup/internal"
"github.com/gohugoio/hugo/markup/converter"
)
// Provider is the package entry point.
var Provider converter.NewProvider = provider{}
type provider struct {
}
func (p provider) New(cfg converter.ProviderConfig) (converter.Provider, error) {
var n converter.NewConverter = func(ctx converter.DocumentContext) (converter.Converter, error) {
return &asciidocConverter{
ctx: ctx,
cfg: cfg,
}, nil
}
return n, 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
}
// 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 {
var isAsciidoctor bool
path := getAsciidoctorExecPath()
if path == "" {
path = getAsciidocExecPath()
if path == "" {
a.cfg.Logger.ERROR.Println("asciidoctor / asciidoc not found in $PATH: Please install.\n",
" Leaving AsciiDoc content unrendered.")
return src
}
} else {
isAsciidoctor = true
}
a.cfg.Logger.INFO.Println("Rendering", ctx.DocumentName, "with", path, "...")
args := []string{"--no-header-footer", "--safe"}
if isAsciidoctor {
// asciidoctor-specific arg to show stack traces on errors
args = append(args, "--trace")
}
args = append(args, "-")
return internal.ExternallyRenderContent(a.cfg, ctx, src, path, args)
}
func getAsciidocExecPath() string {
path, err := exec.LookPath("asciidoc")
if err != nil {
return ""
}
return path
}
func getAsciidoctorExecPath() string {
path, err := exec.LookPath("asciidoctor")
if err != nil {
return ""
}
return path
}
// Supports returns whether Asciidoc or Asciidoctor is installed on this computer.
func Supports() bool {
return (getAsciidoctorExecPath() != "" ||
getAsciidocExecPath() != "")
}
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