133 lines
3.6 KiB
Go
133 lines
3.6 KiB
Go
// Copyright 2017 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package os
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import (
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"errors"
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"fmt"
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_os "os"
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"github.com/gohugoio/hugo/deps"
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"github.com/spf13/afero"
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"github.com/spf13/cast"
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)
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// New returns a new instance of the os-namespaced template functions.
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func New(deps *deps.Deps) *Namespace {
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// Since Hugo 0.38 we can have multiple content dirs. This can make it hard to
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// reason about where the file is placed relative to the project root.
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// To make the {{ readFile .Filename }} variant just work, we create a composite
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// filesystem that first checks the work dir fs and then the content fs.
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var rfs afero.Fs
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if deps.Fs != nil {
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rfs = deps.Fs.WorkingDir
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if deps.PathSpec != nil && deps.PathSpec.BaseFs != nil {
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rfs = afero.NewReadOnlyFs(afero.NewCopyOnWriteFs(deps.PathSpec.BaseFs.Content.Fs, deps.Fs.WorkingDir))
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}
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}
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return &Namespace{
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readFileFs: rfs,
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deps: deps,
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}
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}
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// Namespace provides template functions for the "os" namespace.
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type Namespace struct {
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readFileFs afero.Fs
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deps *deps.Deps
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}
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// Getenv retrieves the value of the environment variable named by the key.
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// It returns the value, which will be empty if the variable is not present.
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func (ns *Namespace) Getenv(key interface{}) (string, error) {
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skey, err := cast.ToStringE(key)
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if err != nil {
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return "", nil
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}
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return _os.Getenv(skey), nil
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}
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// readFile reads the file named by filename in the given filesystem
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// and returns the contents as a string.
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// There is a upper size limit set at 1 megabytes.
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func readFile(fs afero.Fs, filename string) (string, error) {
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if filename == "" {
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return "", errors.New("readFile needs a filename")
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}
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if info, err := fs.Stat(filename); err == nil {
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if info.Size() > 1000000 {
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return "", fmt.Errorf("File %q is too big", filename)
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}
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} else {
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return "", err
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}
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b, err := afero.ReadFile(fs, filename)
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if err != nil {
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return "", err
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}
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return string(b), nil
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}
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// ReadFile reads the file named by filename relative to the configured WorkingDir.
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// It returns the contents as a string.
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// There is an upper size limit set at 1 megabytes.
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func (ns *Namespace) ReadFile(i interface{}) (string, error) {
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s, err := cast.ToStringE(i)
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if err != nil {
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return "", err
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}
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return readFile(ns.readFileFs, s)
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}
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// ReadDir lists the directory contents relative to the configured WorkingDir.
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func (ns *Namespace) ReadDir(i interface{}) ([]_os.FileInfo, error) {
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path, err := cast.ToStringE(i)
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if err != nil {
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return nil, err
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}
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list, err := afero.ReadDir(ns.deps.Fs.WorkingDir, path)
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if err != nil {
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return nil, fmt.Errorf("Failed to read Directory %s with error message %s", path, err)
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}
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return list, nil
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}
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// FileExists checks whether a file exists under the given path.
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func (ns *Namespace) FileExists(i interface{}) (bool, error) {
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path, err := cast.ToStringE(i)
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if err != nil {
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return false, err
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}
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if path == "" {
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return false, errors.New("fileExists needs a path to a file")
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}
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status, err := afero.Exists(ns.readFileFs, path)
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if err != nil {
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return false, err
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}
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return status, nil
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}
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