commands/new: Embed site and theme skeletons

The skeletons are used when creating new sites and themes with the CLI.

Closes #11358

create/skeletons/skeletons.go

@@ -0,0 +1,111 @@
+// Copyright 2023 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 skeletons
+
+import (
+	"bytes"
+	"embed"
+	"errors"
+	"io/fs"
+	"path/filepath"
+	"strings"
+
+	"github.com/gohugoio/hugo/helpers"
+	"github.com/gohugoio/hugo/parser"
+	"github.com/gohugoio/hugo/parser/metadecoders"
+	"github.com/spf13/afero"
+)
+
+//go:embed all:site/*
+var siteFs embed.FS
+
+//go:embed all:theme/*
+var themeFs embed.FS
+
+// CreateTheme creates a theme skeleton.
+func CreateTheme(createpath string, sourceFs afero.Fs) error {
+	if exists, _ := helpers.Exists(createpath, sourceFs); exists {
+		return errors.New(createpath + " already exists")
+	}
+	return copyFiles(createpath, sourceFs, themeFs)
+}
+
+// CreateSite creates a site skeleton.
+func CreateSite(createpath string, sourceFs afero.Fs, force bool, format string) error {
+	format = strings.ToLower(format)
+	if exists, _ := helpers.Exists(createpath, sourceFs); exists {
+		if isDir, _ := helpers.IsDir(createpath, sourceFs); !isDir {
+			return errors.New(createpath + " already exists but not a directory")
+		}
+
+		isEmpty, _ := helpers.IsEmpty(createpath, sourceFs)
+
+		switch {
+		case !isEmpty && !force:
+			return errors.New(createpath + " already exists and is not empty. See --force.")
+		case !isEmpty && force:
+			var all []string
+			fs.WalkDir(siteFs, ".", func(path string, d fs.DirEntry, err error) error {
+				if d.IsDir() && path != "." {
+					all = append(all, path)
+				}
+				return nil
+			})
+			all = append(all, filepath.Join(createpath, "hugo."+format))
+			for _, path := range all {
+				if exists, _ := helpers.Exists(path, sourceFs); exists {
+					return errors.New(path + " already exists")
+				}
+			}
+		}
+	}
+
+	err := newSiteCreateConfig(sourceFs, createpath, format)
+	if err != nil {
+		return err
+	}
+
+	return copyFiles(createpath, sourceFs, siteFs)
+}
+
+func copyFiles(createpath string, sourceFs afero.Fs, skeleton embed.FS) error {
+	return fs.WalkDir(skeleton, ".", func(path string, d fs.DirEntry, err error) error {
+		_, slug, _ := strings.Cut(path, "/")
+		if d.IsDir() {
+			return sourceFs.MkdirAll(filepath.Join(createpath, slug), 0777)
+		} else {
+			if filepath.Base(path) != ".gitkeep" {
+				data, _ := fs.ReadFile(skeleton, path)
+				return helpers.WriteToDisk(filepath.Join(createpath, slug), bytes.NewReader(data), sourceFs)
+			}
+			return nil
+		}
+	})
+}
+
+func newSiteCreateConfig(fs afero.Fs, createpath string, format string) (err error) {
+	in := map[string]string{
+		"baseURL":      "https://example.org/",
+		"title":        "My New Hugo Site",
+		"languageCode": "en-us",
+	}
+
+	var buf bytes.Buffer
+	err = parser.InterfaceToConfig(in, metadecoders.FormatFromString(format), &buf)
+	if err != nil {
+		return err
+	}
+
+	return helpers.WriteToDisk(filepath.Join(createpath, "hugo."+format), &buf, fs)
+}