150 lines
3.0 KiB
Go
150 lines
3.0 KiB
Go
// Copyright 2025-present Gustavo "Guz" L. de Mello
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// Copyright 2025-present The Lored.dev Contributors
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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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//
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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 plugins
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import (
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"bytes"
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"fmt"
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"io"
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"io/fs"
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"log/slog"
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"forge.capytal.company/loreddev/x/blogo/plugin"
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)
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const foldingRendererPluginName = "blogo-foldingrenderer-renderer"
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type foldingRenderer struct {
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plugins []plugin.Renderer
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panicOnInit bool
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log *slog.Logger
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}
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type FoldingRendererOpts struct {
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PanicOnInit bool
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Logger *slog.Logger
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}
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type FoldingRenderer interface {
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plugin.WithPlugins
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plugin.Renderer
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}
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func NewFoldingRenderer(opts ...FoldingRendererOpts) FoldingRenderer {
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opt := FoldingRendererOpts{}
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if len(opts) > 0 {
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opt = opts[0]
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}
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if opt.Logger == nil {
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opt.Logger = slog.New(slog.NewTextHandler(io.Discard, &slog.HandlerOptions{}))
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}
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opt.Logger = opt.Logger.WithGroup(foldingRendererPluginName)
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return &foldingRenderer{
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plugins: []plugin.Renderer{},
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log: opt.Logger,
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}
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}
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func (r *foldingRenderer) Name() string {
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return foldingRendererPluginName
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}
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func (r *foldingRenderer) Use(p plugin.Plugin) {
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log := r.log.With(slog.String("plugin", p.Name()))
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if pr, ok := p.(plugin.Renderer); ok {
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r.plugins = append(r.plugins, pr)
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} else {
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m := fmt.Sprintf("failed to add plugin %q, since it doesn't implement plugin.Renderer", p.Name())
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log.Error(m)
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if r.panicOnInit {
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panic(fmt.Sprintf("%s: %s", foldingRendererPluginName, m))
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}
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}
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}
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func (r *foldingRenderer) Render(src fs.File, w io.Writer) error {
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if len(r.plugins) == 0 {
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_, err := io.Copy(w, src)
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return err
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}
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f, err := newFoldignFile(src)
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if err != nil {
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return err
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}
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for _, p := range r.plugins {
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err := p.Render(f, f)
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if err != nil {
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return err
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}
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if err := f.Fold(); err != nil {
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return err
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}
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}
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_, err = io.Copy(w, f)
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return err
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}
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type foldingFile struct {
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fs.File
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read *bytes.Buffer
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writer *bytes.Buffer
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}
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func newFoldignFile(f fs.File) (*foldingFile, error) {
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var r, w bytes.Buffer
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if _, err := io.Copy(&r, f); err != nil {
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return nil, err
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}
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if err := f.Close(); err != nil {
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return nil, err
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}
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return &foldingFile{File: f, read: &r, writer: &w}, nil
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}
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func (f *foldingFile) Close() error {
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return nil
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}
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func (f *foldingFile) Read(p []byte) (int, error) {
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return f.read.Read(p)
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}
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func (f *foldingFile) Write(p []byte) (int, error) {
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return f.writer.Write(p)
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}
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func (f *foldingFile) Fold() error {
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f.read.Reset()
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if _, err := io.Copy(f.writer, f.read); err != nil {
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return err
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}
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f.writer.Reset()
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return nil
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}
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