hugo/lazy/once.go
Bjørn Erik Pedersen 597e418cb0
Make Page an interface
The main motivation of this commit is to add a `page.Page` interface to replace the very file-oriented `hugolib.Page` struct.
This is all a preparation step for issue  #5074, "pages from other data sources".

But this also fixes a set of annoying limitations, especially related to custom output formats, and shortcodes.

Most notable changes:

* The inner content of shortcodes using the `{{%` as the outer-most delimiter will now be sent to the content renderer, e.g. Blackfriday.
  This means that any markdown will partake in the global ToC and footnote context etc.
* The Custom Output formats are now "fully virtualized". This removes many of the current limitations.
* The taxonomy list type now has a reference to the `Page` object.
  This improves the taxonomy template `.Title` situation and make common template constructs much simpler.

See #5074
Fixes #5763
Fixes #5758
Fixes #5090
Fixes #5204
Fixes #4695
Fixes #5607
Fixes #5707
Fixes #5719
Fixes #3113
Fixes #5706
Fixes #5767
Fixes #5723
Fixes #5769
Fixes #5770
Fixes #5771
Fixes #5759
Fixes #5776
Fixes #5777
Fixes #5778
2019-03-23 18:51:22 +01:00

69 lines
1.5 KiB
Go

// 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 lazy
import (
"sync"
"sync/atomic"
)
// onceMore is similar to sync.Once.
//
// Additional features are:
// * it can be reset, so the action can be repeated if needed
// * it has methods to check if it's done or in progress
//
type onceMore struct {
mu sync.Mutex
lock uint32
done uint32
}
func (t *onceMore) Do(f func()) {
if atomic.LoadUint32(&t.done) == 1 {
return
}
// f may call this Do and we would get a deadlock.
locked := atomic.CompareAndSwapUint32(&t.lock, 0, 1)
if !locked {
return
}
defer atomic.StoreUint32(&t.lock, 0)
t.mu.Lock()
defer t.mu.Unlock()
// Double check
if t.done == 1 {
return
}
defer atomic.StoreUint32(&t.done, 1)
f()
}
func (t *onceMore) InProgress() bool {
return atomic.LoadUint32(&t.lock) == 1
}
func (t *onceMore) Done() bool {
return atomic.LoadUint32(&t.done) == 1
}
func (t *onceMore) ResetWithLock() *sync.Mutex {
t.mu.Lock()
defer atomic.StoreUint32(&t.done, 0)
return &t.mu
}