mirror of https://github.com/gohugoio/hugo.git
129 lines
3.1 KiB
Go
129 lines
3.1 KiB
Go
// Copyright 2015 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 hugolib
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import (
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"errors"
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"fmt"
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"github.com/gohugoio/hugo/source"
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)
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var handlers []Handler
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// MetaHandler abstracts reading and converting functionality of a Handler.
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type MetaHandler interface {
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// Read the Files in and register
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Read(*source.File, *Site, HandleResults)
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// Generic Convert Function with coordination
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Convert(interface{}, *Site, HandleResults)
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Handle() Handler
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}
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// HandledResults is a channel for HandledResult.
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type HandleResults chan<- HandledResult
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// NewMetaHandler creates a MetaHandle for a given extention.
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func NewMetaHandler(in string) *MetaHandle {
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x := &MetaHandle{ext: in}
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x.Handler()
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return x
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}
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// MetaHandle is a generic MetaHandler that internally uses
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// the globally registered handlers for handling specific file types.
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type MetaHandle struct {
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handler Handler
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ext string
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}
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func (mh *MetaHandle) Read(f *source.File, s *Site, results HandleResults) {
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if h := mh.Handler(); h != nil {
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results <- h.Read(f, s)
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return
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}
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results <- HandledResult{err: errors.New("No handler found"), file: f}
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}
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// Convert handles the convertion of files and pages.
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func (mh *MetaHandle) Convert(i interface{}, s *Site, results HandleResults) {
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h := mh.Handler()
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if f, ok := i.(*source.File); ok {
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results <- h.FileConvert(f, s)
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return
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}
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if p, ok := i.(*Page); ok {
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if p == nil {
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results <- HandledResult{err: errors.New("file resulted in a nil page")}
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return
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}
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if h == nil {
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results <- HandledResult{err: fmt.Errorf("No handler found for page '%s'. Verify the markup is supported by Hugo.", p.FullFilePath())}
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return
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}
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results <- h.PageConvert(p)
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}
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}
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// Handler finds the registered handler for the used extention.
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func (mh *MetaHandle) Handler() Handler {
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if mh.handler == nil {
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mh.handler = FindHandler(mh.ext)
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// if no handler found, use default handler
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if mh.handler == nil {
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mh.handler = FindHandler("*")
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}
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}
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return mh.handler
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}
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// FindHandler finds a Handler in the globally registered handlers.
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func FindHandler(ext string) Handler {
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for _, h := range Handlers() {
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if HandlerMatch(h, ext) {
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return h
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}
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}
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return nil
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}
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// HandlerMatch checks if the given extention matches.
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func HandlerMatch(h Handler, ext string) bool {
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for _, x := range h.Extensions() {
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if ext == x {
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return true
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}
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}
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return false
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}
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// RegisterHandler adds a handler to the globally registered ones.
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func RegisterHandler(h Handler) {
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handlers = append(handlers, h)
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}
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// Handlers returns the globally registered handlers.
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func Handlers() []Handler {
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return handlers
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}
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