Add feature glossary API endpoint

app.js

@@ -177,6 +177,11 @@ app.get('/api/search/:letter?', function (req, res, next) {
   res.send(data)
 })
 
+app.get('/api/features/', function (req, res) {
+  // Feature Glossary
+  res.send(lib.glossary(loadDocuments(DIR)))
+})
+
 app.get('/api/features/:letter?', function (req, res) {
   // Feature Search Endpoint with query parameters
   // <feature category="diakritika" type="akut" subtype="akutstattgravis" ref="26">
@@ -213,6 +218,7 @@ app.get('/api/features/:letter?', function (req, res) {
   res.send(data.sort(lib.compare))
 })
 
+
 app.get('/api/letters/:letter?', function (req, res) {
   // Document Endpoint with optional Document name
   // Lists either all or one given document
@@ -242,6 +248,10 @@ app.get('/api/metadata/reload', function (req, res) {
 // Loading all documents to cache
 loadDocumentsToCache(DIR)
 
+// Loading all documents to cache
+// loadGlossaryToCache(DIR)
+
+
 // Where the magic happens
 app.listen(PORT, function () {
   console.log('> Listening at http://localhost:' + PORT)

lib.js

@@ -143,6 +143,59 @@ function searchFeaturesInDocument (document, query) {
   return document
 }
 
+function featureToString (feature) {
+  /*
+   * Turn into feature object into category>type>subtype String
+   */
+
+  let category = feature.category
+  let type = feature.type
+  let subtype = feature.subtype
+
+  let ret = ''
+
+  if (category !== undefined) {
+    ret = ret.concat(category)
+  }
+  if (type !== undefined) {
+    ret = ret.concat(' > ', type)
+  }
+  if (subtype !== undefined) {
+    ret = ret.concat(' > ', subtype)
+  }
+
+  return ret
+}
+
+function featureGlossary (objs) {
+  /*
+   * Turn list of documents objects into a glossary set
+   */
+
+  let featureList = []
+
+  for (let document of objs) {
+    try {
+      let documentFeatures = findKeyRecursive(document, 'feature')
+      for (let feature of documentFeatures) {
+        delete feature._attributes['ref']
+        featureList.push(feature._attributes)
+      }
+    } catch (err) {
+      console.log(arguments.callee) // eslint-disable-line no-caller
+      console.log('>> Error while getting features from' + document.name)
+      console.log(err)
+    }
+  }
+
+  let featureArray = []
+  for (let feat of featureList) {
+    featureArray.push(featureToString(feat))
+  }
+
+  return Array.from(new Set(featureArray))
+}
+
 function metadataTable (objs) {
   /*
    * Turn list of documents objects into metadata table format
@@ -189,6 +242,9 @@ module.exports = {
   table: function (objs) {
     return metadataTable(objs)
   },
+  glossary: function (objs) {
+    return featureGlossary(objs)
+  },
   compare: function (a, b) {
     if (a.hits > b.hits) { return -1 }
     if (a.hits < b.hits) { return 1 }