exportAll: process all map features, prepare final json

src/chunkSplit.js

@@ -0,0 +1,9 @@
+module.exports = function chunkSplit (data, size=1000) {
+  let result = []
+
+  for (let i = 0; i < data.length; i += size) {
+    result.push(data.slice(i, i + size))
+  }
+
+  return result
+}

src/exportAll.js

@@ -1,9 +1,52 @@
 const tabs = require('modulekit-tabs')
+const async = require('async')
+const chunkSplit = require('./chunkSplit')
 
 let tab
 let formExport
 
-function prepareDownload () {
+function prepareDownload (callback) {
+  let conf = formExport.get_data()
+  let result = []
+
+  global.baseCategory.allMapFeatures((err, data) => {
+    console.log(data)
+
+    let chunks = chunkSplit(data, 1000)
+
+    async.eachLimit(
+      chunks,
+      1,
+      (chunk, done) => {
+        result = result.concat(chunk.map(ob => {
+          switch (conf.type) {
+            case 'geojson':
+              return ob.object.GeoJSON(conf)
+          }
+        }))
+
+        global.setTimeout(done, 0)
+      },
+      (err) => {
+        if (err) {
+          return callback(err)
+        }
+
+        switch (conf.type) {
+          case 'geojson':
+            result = {
+              type: 'FeatureCollection',
+              features: result
+            }
+            result = JSON.stringify(result, null, '    ')
+        }
+
+        console.log(result)
+
+        callback()
+      }
+    )
+  })
 }
 
 register_hook('init', function () {
@@ -35,8 +78,13 @@ register_hook('init', function () {
   submit.value = lang('export-prepare')
   submit.onclick = () => {
     submit.setAttribute('disabled', 'disabled')
-    alert('Download')
-    submit.removeAttribute('disabled')
+    prepareDownload((err) => {
+      if (err) {
+        alert(err)
+      }
+
+      submit.removeAttribute('disabled')
+    })
   }
   tab.content.appendChild(submit)