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var _ = require("lodash");
// Cleans up an article/chapter object
// remove "articles" attributes
function clean(obj) {
return obj && _.omit(obj, ["articles"]);
}
function flattenChapters(chapters) {
return _.reduce(chapters, function(accu, chapter) {
return accu.concat([clean(chapter)].concat(flattenChapters(chapter.articles)));
}, []);
}
// Returns from a summary a map of
/*
{
"file/path.md": {
prev: ...,
next: ...,
},
...
}
*/
function navigation(summary, files) {
// Support single files as well as list
files = _.isArray(files) ? files : (_.isString(files) ? [files] : null);
// List of all navNodes
// Flatten chapters
var navNodes = flattenChapters(summary.chapters);
// Mapping of prev/next for a give path
var mapping = _.chain(navNodes)
.map(function(current, i) {
var prev = null, next = null;
// Skip if no path
if(!current.exists) return null;
// Find prev
prev = _.chain(navNodes.slice(0, i))
.reverse()
.find(function(node) {
return node.exists && !node.external;
})
.value();
// Find next
next = _.chain(navNodes.slice(i+1))
.find(function(node) {
return node.exists && !node.external;
})
.value();
return [current.path, {
index: i,
title: current.title,
introduction: current.introduction,
prev: prev,
next: next,
level: current.level,
}];
})
.compact()
.object()
.value();
// Filter for only files we want
if(files) {
return _.pick(mapping, files);
}
return mapping;
}
// Exports
module.exports = navigation;
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