First draft of loading 'notes'

scripts/perProperty.ts

@@ -0,0 +1,45 @@
+import * as fs from "fs";
+
+function main(args){
+    if(args.length < 2){
+        console.log("Given a single geojson file, generates the partitions for every found property")
+        console.log("USAGE: perProperty `file.geojson` `property-key`")
+        return
+    }
+    const path = args[0]
+    const key = args[1]
+    
+    const data= JSON.parse(fs.readFileSync(path, "UTF8"))
+    const perProperty = new Map<string, any[]>()
+
+    console.log("Partitioning",data.features.length, "features")
+    for (const feature of data.features) {
+        const v = feature.properties[key]
+        if(!perProperty.has(v)){
+            console.log("Found a new category:", v)
+            perProperty.set(v, [])
+        }
+        perProperty.get(v).push(feature)
+    }
+    
+    const stripped = path.substr(0, path.length - ".geojson".length) 
+    perProperty.forEach((features, v) => {
+        
+        fs.writeFileSync(stripped+"."+v.replace(/[^a-zA-Z0-9_]/g, "_")+".geojson",
+            JSON.stringify({
+                type:"FeatureCollection",
+                features
+            }))
+    })
+
+    
+}
+
+let args = [...process.argv]
+args.splice(0, 2)
+try {
+    main(args)
+} catch (e) {
+    console.error("Error building cache:", e)
+}
+console.log("All done!")