hugo/commands/import_jekyll.go
2017-06-13 18:42:45 +02:00

577 lines
14 KiB
Go

// Copyright 2016 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 commands
import (
"bytes"
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
"github.com/spf13/afero"
"github.com/spf13/cast"
"github.com/spf13/cobra"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/hugofs"
"github.com/gohugoio/hugo/hugolib"
"github.com/gohugoio/hugo/parser"
jww "github.com/spf13/jwalterweatherman"
)
func init() {
importCmd.AddCommand(importJekyllCmd)
}
var importCmd = &cobra.Command{
Use: "import",
Short: "Import your site from others.",
Long: `Import your site from other web site generators like Jekyll.
Import requires a subcommand, e.g. ` + "`hugo import jekyll jekyll_root_path target_path`.",
RunE: nil,
}
var importJekyllCmd = &cobra.Command{
Use: "jekyll",
Short: "hugo import from Jekyll",
Long: `hugo import from Jekyll.
Import from Jekyll requires two paths, e.g. ` + "`hugo import jekyll jekyll_root_path target_path`.",
RunE: importFromJekyll,
}
func init() {
importJekyllCmd.Flags().Bool("force", false, "allow import into non-empty target directory")
}
func importFromJekyll(cmd *cobra.Command, args []string) error {
if len(args) < 2 {
return newUserError(`Import from Jekyll requires two paths, e.g. ` + "`hugo import jekyll jekyll_root_path target_path`.")
}
jekyllRoot, err := filepath.Abs(filepath.Clean(args[0]))
if err != nil {
return newUserError("Path error:", args[0])
}
targetDir, err := filepath.Abs(filepath.Clean(args[1]))
if err != nil {
return newUserError("Path error:", args[1])
}
jww.INFO.Println("Import Jekyll from:", jekyllRoot, "to:", targetDir)
if strings.HasPrefix(filepath.Dir(targetDir), jekyllRoot) {
return newUserError("Target path should not be inside the Jekyll root, aborting.")
}
forceImport, _ := cmd.Flags().GetBool("force")
site, err := createSiteFromJekyll(jekyllRoot, targetDir, forceImport)
if err != nil {
return err
}
jww.FEEDBACK.Println("Importing...")
fileCount := 0
callback := func(path string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
if fi.IsDir() {
return nil
}
relPath, err := filepath.Rel(jekyllRoot, path)
if err != nil {
return newUserError("Get rel path error:", path)
}
relPath = filepath.ToSlash(relPath)
draft := false
switch {
case strings.HasPrefix(relPath, "_posts/"):
relPath = "content/post" + relPath[len("_posts"):]
case strings.HasPrefix(relPath, "_drafts/"):
relPath = "content/draft" + relPath[len("_drafts"):]
draft = true
default:
return nil
}
fileCount++
return convertJekyllPost(site, path, relPath, targetDir, draft)
}
err = helpers.SymbolicWalk(hugofs.Os, jekyllRoot, callback)
if err != nil {
return err
}
jww.FEEDBACK.Println("Congratulations!", fileCount, "post(s) imported!")
jww.FEEDBACK.Println("Now, start Hugo by yourself:\n" +
"$ git clone https://github.com/spf13/herring-cove.git " + args[1] + "/themes/herring-cove")
jww.FEEDBACK.Println("$ cd " + args[1] + "\n$ hugo server --theme=herring-cove")
return nil
}
// TODO: Consider calling doNewSite() instead?
func createSiteFromJekyll(jekyllRoot, targetDir string, force bool) (*hugolib.Site, error) {
s, err := hugolib.NewSiteDefaultLang()
if err != nil {
return nil, err
}
fs := s.Fs.Source
if exists, _ := helpers.Exists(targetDir, fs); exists {
if isDir, _ := helpers.IsDir(targetDir, fs); !isDir {
return nil, errors.New("Target path \"" + targetDir + "\" already exists but not a directory")
}
isEmpty, _ := helpers.IsEmpty(targetDir, fs)
if !isEmpty && !force {
return nil, errors.New("Target path \"" + targetDir + "\" already exists and is not empty")
}
}
jekyllConfig := loadJekyllConfig(fs, jekyllRoot)
// Crude test to make sure at least one of _drafts/ and _posts/ exists
// and is not empty.
hasPostsOrDrafts := false
postsDir := filepath.Join(jekyllRoot, "_posts")
draftsDir := filepath.Join(jekyllRoot, "_drafts")
for _, d := range []string{postsDir, draftsDir} {
if exists, _ := helpers.Exists(d, fs); exists {
if isDir, _ := helpers.IsDir(d, fs); isDir {
if isEmpty, _ := helpers.IsEmpty(d, fs); !isEmpty {
hasPostsOrDrafts = true
}
}
}
}
if !hasPostsOrDrafts {
return nil, errors.New("Your Jekyll root contains neither posts nor drafts, aborting.")
}
mkdir(targetDir, "layouts")
mkdir(targetDir, "content")
mkdir(targetDir, "archetypes")
mkdir(targetDir, "static")
mkdir(targetDir, "data")
mkdir(targetDir, "themes")
createConfigFromJekyll(fs, targetDir, "yaml", jekyllConfig)
copyJekyllFilesAndFolders(jekyllRoot, filepath.Join(targetDir, "static"))
return s, nil
}
func loadJekyllConfig(fs afero.Fs, jekyllRoot string) map[string]interface{} {
path := filepath.Join(jekyllRoot, "_config.yml")
exists, err := helpers.Exists(path, fs)
if err != nil || !exists {
jww.WARN.Println("_config.yaml not found: Is the specified Jekyll root correct?")
return nil
}
f, err := fs.Open(path)
if err != nil {
return nil
}
defer f.Close()
b, err := ioutil.ReadAll(f)
if err != nil {
return nil
}
c, err := parser.HandleYAMLMetaData(b)
if err != nil {
return nil
}
return c.(map[string]interface{})
}
func createConfigFromJekyll(fs afero.Fs, inpath string, kind string, jekyllConfig map[string]interface{}) (err error) {
title := "My New Hugo Site"
baseURL := "http://example.org/"
for key, value := range jekyllConfig {
lowerKey := strings.ToLower(key)
switch lowerKey {
case "title":
if str, ok := value.(string); ok {
title = str
}
case "url":
if str, ok := value.(string); ok {
baseURL = str
}
}
}
in := map[string]interface{}{
"baseURL": baseURL,
"title": title,
"languageCode": "en-us",
"disablePathToLower": true,
}
kind = parser.FormatSanitize(kind)
var buf bytes.Buffer
err = parser.InterfaceToConfig(in, parser.FormatToLeadRune(kind), &buf)
if err != nil {
return err
}
return helpers.WriteToDisk(filepath.Join(inpath, "config."+kind), &buf, fs)
}
func copyFile(source string, dest string) error {
sf, err := os.Open(source)
if err != nil {
return err
}
defer sf.Close()
df, err := os.Create(dest)
if err != nil {
return err
}
defer df.Close()
_, err = io.Copy(df, sf)
if err == nil {
si, err := os.Stat(source)
if err != nil {
err = os.Chmod(dest, si.Mode())
if err != nil {
return err
}
}
}
return nil
}
func copyDir(source string, dest string) error {
fi, err := os.Stat(source)
if err != nil {
return err
}
if !fi.IsDir() {
return errors.New(source + " is not a directory")
}
err = os.MkdirAll(dest, fi.Mode())
if err != nil {
return err
}
entries, err := ioutil.ReadDir(source)
for _, entry := range entries {
sfp := filepath.Join(source, entry.Name())
dfp := filepath.Join(dest, entry.Name())
if entry.IsDir() {
err = copyDir(sfp, dfp)
if err != nil {
jww.ERROR.Println(err)
}
} else {
err = copyFile(sfp, dfp)
if err != nil {
jww.ERROR.Println(err)
}
}
}
return nil
}
func copyJekyllFilesAndFolders(jekyllRoot string, dest string) error {
fi, err := os.Stat(jekyllRoot)
if err != nil {
return err
}
if !fi.IsDir() {
return errors.New(jekyllRoot + " is not a directory")
}
err = os.MkdirAll(dest, fi.Mode())
if err != nil {
return err
}
entries, err := ioutil.ReadDir(jekyllRoot)
for _, entry := range entries {
sfp := filepath.Join(jekyllRoot, entry.Name())
dfp := filepath.Join(dest, entry.Name())
if entry.IsDir() {
if entry.Name()[0] != '_' && entry.Name()[0] != '.' {
err = copyDir(sfp, dfp)
if err != nil {
jww.ERROR.Println(err)
}
}
} else {
lowerEntryName := strings.ToLower(entry.Name())
exceptSuffix := []string{".md", ".markdown", ".html", ".htm",
".xml", ".textile", "rakefile", "gemfile", ".lock"}
isExcept := false
for _, suffix := range exceptSuffix {
if strings.HasSuffix(lowerEntryName, suffix) {
isExcept = true
break
}
}
if !isExcept && entry.Name()[0] != '.' && entry.Name()[0] != '_' {
err = copyFile(sfp, dfp)
if err != nil {
jww.ERROR.Println(err)
}
}
}
}
return nil
}
func parseJekyllFilename(filename string) (time.Time, string, error) {
re := regexp.MustCompile(`(\d+-\d+-\d+)-(.+)\..*`)
r := re.FindAllStringSubmatch(filename, -1)
if len(r) == 0 {
return time.Now(), "", errors.New("filename not match")
}
postDate, err := time.Parse("2006-1-2", r[0][1])
if err != nil {
return time.Now(), "", err
}
postName := r[0][2]
return postDate, postName, nil
}
func convertJekyllPost(s *hugolib.Site, path, relPath, targetDir string, draft bool) error {
jww.TRACE.Println("Converting", path)
filename := filepath.Base(path)
postDate, postName, err := parseJekyllFilename(filename)
if err != nil {
jww.WARN.Printf("Failed to parse filename '%s': %s. Skipping.", filename, err)
return nil
}
jww.TRACE.Println(filename, postDate, postName)
targetFile := filepath.Join(targetDir, relPath)
targetParentDir := filepath.Dir(targetFile)
os.MkdirAll(targetParentDir, 0777)
contentBytes, err := ioutil.ReadFile(path)
if err != nil {
jww.ERROR.Println("Read file error:", path)
return err
}
psr, err := parser.ReadFrom(bytes.NewReader(contentBytes))
if err != nil {
jww.ERROR.Println("Parse file error:", path)
return err
}
metadata, err := psr.Metadata()
if err != nil {
jww.ERROR.Println("Processing file error:", path)
return err
}
newmetadata, err := convertJekyllMetaData(metadata, postName, postDate, draft)
if err != nil {
jww.ERROR.Println("Convert metadata error:", path)
return err
}
jww.TRACE.Println(newmetadata)
content := convertJekyllContent(newmetadata, string(psr.Content()))
page, err := s.NewPage(filename)
if err != nil {
jww.ERROR.Println("New page error", filename)
return err
}
page.SetDir(targetParentDir)
page.SetSourceContent([]byte(content))
page.SetSourceMetaData(newmetadata, parser.FormatToLeadRune("yaml"))
page.SaveSourceAs(targetFile)
jww.TRACE.Println("Target file:", targetFile)
return nil
}
func convertJekyllMetaData(m interface{}, postName string, postDate time.Time, draft bool) (interface{}, error) {
url := postDate.Format("/2006/01/02/") + postName + "/"
metadata, err := cast.ToStringMapE(m)
if err != nil {
return nil, err
}
if draft {
metadata["draft"] = true
}
for key, value := range metadata {
lowerKey := strings.ToLower(key)
switch lowerKey {
case "layout":
delete(metadata, key)
case "permalink":
if str, ok := value.(string); ok {
url = str
}
delete(metadata, key)
case "category":
if str, ok := value.(string); ok {
metadata["categories"] = []string{str}
}
delete(metadata, key)
case "excerpt_separator":
if key != lowerKey {
delete(metadata, key)
metadata[lowerKey] = value
}
case "date":
if str, ok := value.(string); ok {
re := regexp.MustCompile(`(\d+):(\d+):(\d+)`)
r := re.FindAllStringSubmatch(str, -1)
if len(r) > 0 {
hour, _ := strconv.Atoi(r[0][1])
minute, _ := strconv.Atoi(r[0][2])
second, _ := strconv.Atoi(r[0][3])
postDate = time.Date(postDate.Year(), postDate.Month(), postDate.Day(), hour, minute, second, 0, time.UTC)
}
}
delete(metadata, key)
}
}
metadata["url"] = url
metadata["date"] = postDate.Format(time.RFC3339)
return metadata, nil
}
func convertJekyllContent(m interface{}, content string) string {
metadata, _ := cast.ToStringMapE(m)
lines := strings.Split(content, "\n")
var resultLines []string
for _, line := range lines {
resultLines = append(resultLines, strings.Trim(line, "\r\n"))
}
content = strings.Join(resultLines, "\n")
excerptSep := "<!--more-->"
if value, ok := metadata["excerpt_separator"]; ok {
if str, strOk := value.(string); strOk {
content = strings.Replace(content, strings.TrimSpace(str), excerptSep, -1)
}
}
replaceList := []struct {
re *regexp.Regexp
replace string
}{
{regexp.MustCompile("(?i)<!-- more -->"), "<!--more-->"},
{regexp.MustCompile(`\{%\s*raw\s*%\}\s*(.*?)\s*\{%\s*endraw\s*%\}`), "$1"},
{regexp.MustCompile(`{%\s*highlight\s*(.*?)\s*%}`), "{{< highlight $1 >}}"},
{regexp.MustCompile(`{%\s*endhighlight\s*%}`), "{{< / highlight >}}"},
}
for _, replace := range replaceList {
content = replace.re.ReplaceAllString(content, replace.replace)
}
replaceListFunc := []struct {
re *regexp.Regexp
replace func(string) string
}{
// Octopress image tag: http://octopress.org/docs/plugins/image-tag/
{regexp.MustCompile(`{%\s+img\s*(.*?)\s*%}`), replaceImageTag},
}
for _, replace := range replaceListFunc {
content = replace.re.ReplaceAllStringFunc(content, replace.replace)
}
return content
}
func replaceImageTag(match string) string {
r := regexp.MustCompile(`{%\s+img\s*(\p{L}*)\s+([\S]*/[\S]+)\s+(\d*)\s*(\d*)\s*(.*?)\s*%}`)
result := bytes.NewBufferString("{{< figure ")
parts := r.FindStringSubmatch(match)
// Index 0 is the entire string, ignore
replaceOptionalPart(result, "class", parts[1])
replaceOptionalPart(result, "src", parts[2])
replaceOptionalPart(result, "width", parts[3])
replaceOptionalPart(result, "height", parts[4])
// title + alt
part := parts[5]
if len(part) > 0 {
splits := strings.Split(part, "'")
lenSplits := len(splits)
if lenSplits == 1 {
replaceOptionalPart(result, "title", splits[0])
} else if lenSplits == 3 {
replaceOptionalPart(result, "title", splits[1])
} else if lenSplits == 5 {
replaceOptionalPart(result, "title", splits[1])
replaceOptionalPart(result, "alt", splits[3])
}
}
result.WriteString(">}}")
return result.String()
}
func replaceOptionalPart(buffer *bytes.Buffer, partName string, part string) {
if len(part) > 0 {
buffer.WriteString(partName + "=\"" + part + "\" ")
}
}