From 826d2a11a260b78f4b81099ad66d11758ad93fe6 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Mon, 14 Aug 2023 15:07:27 +0200
Subject: [PATCH 01/42] add host to configuration

---
 src/main.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main.js b/src/main.js
index 66ac779..32edd05 100644
--- a/src/main.js
+++ b/src/main.js
@@ -53,6 +53,12 @@ function ymlContentToConfig(ymlContent) {
         throw new Error("Error parsing YAML: Google sheet id should be specified");
     }
 
+    if (configJson.host) {
+        config.host = configJson.host
+    } else {
+        throw new Error("Error parsing YAML: host value should be specified")
+    }
+
     config.interval = configJson.sheet.interval ? configJson.sheet.interval : 5000;
 }
 

From 54d5dd935858177c4c724f7f5cfc6a8285841958 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Mon, 14 Aug 2023 15:47:16 +0200
Subject: [PATCH 02/42] util function object comparison.

---
 src/util.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 src/util.js

diff --git a/src/util.js b/src/util.js
new file mode 100644
index 0000000..dabb617
--- /dev/null
+++ b/src/util.js
@@ -0,0 +1,16 @@
+export function shallowEqual(obj1, obj2) {
+    const keys1 = Object.keys(obj1);
+    const keys2 = Object.keys(obj2);
+
+    if (keys1.length !== keys2.length) {
+        return false;
+    }
+
+    for (let key of keys1) {
+        if (!obj2.hasOwnProperty(key) || obj1[key] !== obj2[key]) {
+            return false;
+        }
+    }
+
+    return true;
+}
\ No newline at end of file

From 7c89b8ca706449c68623d92bc5aa4037e28c74ed Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Mon, 14 Aug 2023 15:47:50 +0200
Subject: [PATCH 03/42] function to get websocket registration endpoint

---
 src/solid.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/solid.js b/src/solid.js
index 46591e0..6b5fae7 100644
--- a/src/solid.js
+++ b/src/solid.js
@@ -37,6 +37,21 @@ export async function queryResource(config) {
     });
 }
 
+export async function getNotificationChannelTypes(url){
+    const myEngine = new QueryEngine();
+    const result = await (await myEngine.queryBindings(`
+        SELECT DISTINCT ?channel WHERE {
+            ?s a <http://www.w3.org/ns/pim/space#Storage> .
+            ?s <http://www.w3.org/ns/solid/notifications#subscription> ?channel .
+            ?channel <http://www.w3.org/ns/solid/notifications#channelType> <http://www.w3.org/ns/solid/notifications#WebSocketChannel2023>
+        }`,
+        {
+            sources: [url],
+        }
+    )).toArray();
+    return result.map(binding => binding.get("channel").value)
+}
+
 /**
  * Convert the "fields" configuration data into a SPARQL query
  * @param {Object} config - Configuration object containing the necessary information build the SPARQL query (required and optional fields).

From b958eef70a44cdcb7ccde7dafc47fd341c6879e1 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Mon, 14 Aug 2023 15:48:08 +0200
Subject: [PATCH 04/42] add websocket to package

---
 package-lock.json | 4 ++--
 package.json      | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index ac1b3a9..853b82e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,7 +15,8 @@
         "googleapis": "^122.0.0",
         "http-server": "^14.1.1",
         "js-yaml": "^4.1.0",
-        "n3": "^1.17.0"
+        "n3": "^1.17.0",
+        "ws": "^8.13.0"
       },
       "devDependencies": {
         "@solid/community-server": "^6.0.1",
@@ -8362,7 +8363,6 @@
       "version": "8.13.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-8.13.0.tgz",
       "integrity": "sha512-x9vcZYTrFPC7aSIbj7sRCYo7L/Xb8Iy+pW0ng0wt2vCJv7M9HOMy0UoN3rr+IFC7hb7vXoqS+P9ktyLLLhO+LA==",
-      "dev": true,
       "engines": {
         "node": ">=10.0.0"
       },
diff --git a/package.json b/package.json
index fa309a1..b7cdb50 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,8 @@
     "googleapis": "^122.0.0",
     "http-server": "^14.1.1",
     "js-yaml": "^4.1.0",
-    "n3": "^1.17.0"
+    "n3": "^1.17.0",
+    "ws": "^8.13.0"
   },
   "type": "module"
 }

From 8feefb15817e0ab66c2defb4055dcb7c7b09ceb7 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:06:34 +0200
Subject: [PATCH 05/42] array compare for objects

---
 src/util.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/util.js b/src/util.js
index dabb617..c59e113 100644
--- a/src/util.js
+++ b/src/util.js
@@ -13,4 +13,19 @@ export function shallowEqual(obj1, obj2) {
     }
 
     return true;
+}
+
+export function compareArrays(first, second) {
+    let equal = true
+    first.forEach((element) => {
+        if (second.filter((entry) => shallowEqual(entry, element)).length === 0){
+            equal = false;
+        }
+    })
+    second.forEach((element) => {
+        if(first.filter((entry) => shallowEqual(entry, element)).length === 0) {
+            equal = false;
+        }
+    })
+    return equal;
 }
\ No newline at end of file

From f8d917578ac9cac0c0f9a0a37da2d8a7e08ddae9 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:07:02 +0200
Subject: [PATCH 06/42] noCache option when querying resources

---
 src/solid.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/solid.js b/src/solid.js
index 6b5fae7..59bb144 100644
--- a/src/solid.js
+++ b/src/solid.js
@@ -4,11 +4,15 @@ import {Writer} from "n3";
 /**
  * Query the data from the Solid pod/resource(s) using the configuration
  * @param {Object} config - Configuration object containing the necessary information to query and process the retrieved data.
+ * @param {boolean} noCache - clear http cache to get most recent document.
  * @return {Promise<{array, array}>} Map objects containing the retrieved data
  * and all possible keys representing the properties contained in the maps.
  */
-export async function queryResource(config) {
+export async function queryResource(config, noCache = false) {
     const myEngine = new QueryEngine();
+    if (noCache){
+        await myEngine.invalidateHttpCache();
+    }
     const results = [];
     const keys = new Set();
     const query = config.query !== undefined ? config.query : configToSPARQLQuery(config);

From 688b95622d91461fe31637d911064dcd6bfec95c Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:23:19 +0200
Subject: [PATCH 07/42] add sheet name to config to monitor entire sheet

---
 src/main.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main.js b/src/main.js
index 32edd05..d1bfbbc 100644
--- a/src/main.js
+++ b/src/main.js
@@ -53,6 +53,12 @@ function ymlContentToConfig(ymlContent) {
         throw new Error("Error parsing YAML: Google sheet id should be specified");
     }
 
+    if (configJson.sheet.name) {
+        config.sheetName = configJson.sheet.name
+    } else {
+        throw new Error("Error parsing YAML: Google sheet name should be specified")
+    }
+
     if (configJson.host) {
         config.host = configJson.host
     } else {

From 43602a9b779fde009c06f60517f61d51e1922086 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:25:20 +0200
Subject: [PATCH 08/42] add pagename in google code

---
 src/google.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/google.js b/src/google.js
index 708df57..39ba5f5 100644
--- a/src/google.js
+++ b/src/google.js
@@ -57,11 +57,12 @@ export async function writeToSheet(array, sheetId) {
 /**
  * Pull data from the sheet and check if there are any changes with the previously pulled data.
  * @param {String} sheetId - ID of the Google sheet from which the data should be pulled and checked.
+ * @param {String} pageName - Name of the excel page to check
  * @return {Promise<{Boolean, Array}>} - 2D-array containing the latest data from the sheet
  * and a boolean indicating a possible change.
  */
-export async function checkSheetForChanges(sheetId) {
-    const rows = await getFromSheet(sheetId);
+export async function checkSheetForChanges(sheetId, pageName) {
+    const rows = await getFromSheet(sheetId, pageName);
     const hasChanged = previousRows !== undefined && !areArraysEqual(rows, previousRows);
     previousRows = rows;
     return {
@@ -73,12 +74,13 @@ export async function checkSheetForChanges(sheetId) {
 /**
  * Get the data from the sheet in the initial range.
  * @param {String} sheetId - ID from the sheet from which the data should be pulled.
+ * @param {String} pageName - Name of the excel page to check
  * @return {Array} 2D-array containing the data from the sheet.
  */
-async function getFromSheet(sheetId){
+async function getFromSheet(sheetId, pageName) {
     const response = await sheets.spreadsheets.values.get({
         spreadsheetId: sheetId,
-        range: 'A:ZZZ'
+        range: pageName
     });
 
     return response.data.values;

From 58675deba5a8ea04b687dab4bd4e489e50e23508 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:26:15 +0200
Subject: [PATCH 09/42] give name from config + save some data for later checks

---
 src/main.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main.js b/src/main.js
index d1bfbbc..66ddd66 100644
--- a/src/main.js
+++ b/src/main.js
@@ -9,6 +9,7 @@ let config = {};
 
 // Array containing all quads on the sheet when the last change was detected.
 let previousQuads;
+let previousMap;
 
 /**
  * Parse YAML data and store it in the configuration object.
@@ -174,6 +175,7 @@ async function startFromFile(configPath, rulesPath) {
     await makeClient();
     const rows = await writeToSheet(arrays, config.sheetid);
     const maps = rowsToObjects(rows);
+    previousMap = maps;
     previousQuads = await objectsToRdf({data: maps}, rml);
 
 
@@ -181,10 +183,11 @@ async function startFromFile(configPath, rulesPath) {
 
     // Sheet -> Pod sync
     setInterval(async () => {
-        const {rows, hasChanged} = await checkSheetForChanges(config.sheetid);
+        const {rows, hasChanged} = await checkSheetForChanges(config.sheetid, config.sheetName);
         if (hasChanged) {
             console.log("Changes detected. Synchronizing...");
             const maps = rowsToObjects(rows);
+            previousMap = maps;
 
             const quads = await objectsToRdf({data: maps}, rml);
 

From 9638b333a41cebb4dea8972e9111b5955a97b065 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:32:03 +0200
Subject: [PATCH 10/42] websocket requestOptions util method

---
 src/util.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/util.js b/src/util.js
index c59e113..9d61092 100644
--- a/src/util.js
+++ b/src/util.js
@@ -28,4 +28,24 @@ export function compareArrays(first, second) {
         }
     })
     return equal;
+}
+
+export function getWebsocketRequestOptions(source){
+    let myHeaders = new Headers();
+    myHeaders.append("Content-Type", "application/ld+json");
+
+    let raw = JSON.stringify({
+        "@context": [
+            "https://www.w3.org/ns/solid/notification/v1"
+        ],
+        "type": "http://www.w3.org/ns/solid/notifications#WebSocketChannel2023",
+        "topic": source
+    });
+
+    return {
+        method: 'POST',
+        headers: myHeaders,
+        body: raw,
+        redirect: 'follow'
+    };
 }
\ No newline at end of file

From 8b3335eef9b5ce333db93209d16beb5222bec036 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:37:05 +0200
Subject: [PATCH 11/42] websocket setup working - I think

---
 src/main.js | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/main.js b/src/main.js
index 66ddd66..796fd0f 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,8 +1,10 @@
 import {checkSheetForChanges, makeClient, writeToSheet} from "./google.js";
 import {load} from "js-yaml";
 import {objectsToRdf, yarrrmlToRml} from "./rdf-generation.js";
-import {queryResource, updateResource} from "./solid.js";
+import {getNotificationChannelTypes, queryResource, updateResource} from "./solid.js";
 import {readFile} from 'fs/promises'
+import {WebSocket} from 'ws';
+import {compareArrays, getWebsocketRequestOptions} from "./util.js";
 
 // Object containing information relating to the configuration of the synchronisation app.
 let config = {};
@@ -180,6 +182,38 @@ async function startFromFile(configPath, rulesPath) {
 
 
     console.log("Synchronisation cold start completed");
+    // Pod -> Sheet sync
+
+    let websocket_endpoints = await getNotificationChannelTypes(config.host + "/.well-known/solid");
+
+    if (websocket_endpoints.length > 0 && websocket_endpoints[0].length > 0) {
+        // listen using websockets
+        let url = websocket_endpoints[0]
+        let requestOptions = getWebsocketRequestOptions(config.source)
+
+        let response = await (await fetch(url, requestOptions)).json()
+        let endpoint = response["receiveFrom"];
+        const ws = new WebSocket(endpoint);
+        ws.on("message", async (notification) => {
+            let content = JSON.parse(notification);
+            if (content.type === "Update") {
+                const {results} = await queryResource(config, true);
+                const arrays = mapsTo2DArray(results);
+                const maps = rowsToObjects(arrays);
+                if (!compareArrays(maps, previousMap)) {
+                    const rows = await writeToSheet(arrays, config.sheetid);
+                    const maps2 = rowsToObjects(rows);
+                    previousMap = maps2;
+                    previousQuads = await objectsToRdf({data: maps2}, rml);
+                } else {
+                    console.log("got notified but the latest changes are already present");
+                }
+            }
+        })
+    } else {
+        // polling using timers
+        // TODO
+    }
 
     // Sheet -> Pod sync
     setInterval(async () => {

From c218b7c560bd63d64ca7c0119776c4ed2d83ae92 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:44:00 +0200
Subject: [PATCH 12/42] add debug config options + timer to check changes on
 pod

---
 src/main.js | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/main.js b/src/main.js
index 796fd0f..996175b 100644
--- a/src/main.js
+++ b/src/main.js
@@ -68,6 +68,12 @@ function ymlContentToConfig(ymlContent) {
         throw new Error("Error parsing YAML: host value should be specified")
     }
 
+    if (configJson.debug){
+        if (configJson.debug.websockets) {
+            config.debug_noWebSockets = configJson.debug.websockets === "false"
+        }
+    }
+
     config.interval = configJson.sheet.interval ? configJson.sheet.interval : 5000;
 }
 
@@ -186,7 +192,7 @@ async function startFromFile(configPath, rulesPath) {
 
     let websocket_endpoints = await getNotificationChannelTypes(config.host + "/.well-known/solid");
 
-    if (websocket_endpoints.length > 0 && websocket_endpoints[0].length > 0) {
+    if (websocket_endpoints.length > 0 && websocket_endpoints[0].length > 0 && (!config.debug_noWebSockets)) {
         // listen using websockets
         let url = websocket_endpoints[0]
         let requestOptions = getWebsocketRequestOptions(config.source)
@@ -212,7 +218,17 @@ async function startFromFile(configPath, rulesPath) {
         })
     } else {
         // polling using timers
-        // TODO
+        setInterval(async () => {
+            const {results} = await queryResource(config, true);
+            const arrays = mapsTo2DArray(results);
+            const maps = rowsToObjects(arrays);
+            if (!compareArrays(maps, previousMap)) {
+                const rows = await writeToSheet(arrays, config.sheetid);
+                const maps2 = rowsToObjects(rows);
+                previousMap = maps2;
+                previousQuads = await objectsToRdf({data: maps2}, rml);
+            }
+        }, config.interval);
     }
 
     // Sheet -> Pod sync

From ae67c5ff43f93a0e918431e0b476bf0aaf8a809f Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 09:50:32 +0200
Subject: [PATCH 13/42] gitignore

---
 .gitignore | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.gitignore b/.gitignore
index e8ec0b3..a2c10e5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+.idea/
+src/testing.js
 .env
 config.yml
 credentials.json

From d401d0a7a75fbc51688754893da6119bf2de0fdc Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 10:33:30 +0200
Subject: [PATCH 14/42] recode comparison. Second loop removed and added length
 check.

---
 src/util.js | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/util.js b/src/util.js
index 9d61092..66b2231 100644
--- a/src/util.js
+++ b/src/util.js
@@ -16,18 +16,15 @@ export function shallowEqual(obj1, obj2) {
 }
 
 export function compareArrays(first, second) {
-    let equal = true
+    if(first.length !== second.length) {
+        return false;
+    }
     first.forEach((element) => {
         if (second.filter((entry) => shallowEqual(entry, element)).length === 0){
-            equal = false;
-        }
-    })
-    second.forEach((element) => {
-        if(first.filter((entry) => shallowEqual(entry, element)).length === 0) {
-            equal = false;
+            return false;
         }
     })
-    return equal;
+    return true;
 }
 
 export function getWebsocketRequestOptions(source){

From 5d57db25d8264901ae081e72afc56870d671fe1b Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 10:33:51 +0200
Subject: [PATCH 15/42] comments + auto format file

---
 src/util.js | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/util.js b/src/util.js
index 66b2231..079ed77 100644
--- a/src/util.js
+++ b/src/util.js
@@ -1,3 +1,9 @@
+/**
+ * Compares objects - checks keys and values
+ * @param {Object} obj1
+ * @param {Object} obj2
+ * @returns {boolean} Boolean that indicates if the objects are equal
+ */
 export function shallowEqual(obj1, obj2) {
     const keys1 = Object.keys(obj1);
     const keys2 = Object.keys(obj2);
@@ -15,19 +21,31 @@ export function shallowEqual(obj1, obj2) {
     return true;
 }
 
+
+/**
+ * Compares 2 arrays and checks if they contain the same objects (order doesn't matter)
+ * @param {Object[]} first
+ * @param {Object[]} second
+ * @returns {boolean} Boolean that indicates if the arrays are equal (not counting order)
+ */
 export function compareArrays(first, second) {
-    if(first.length !== second.length) {
+    if (first.length !== second.length) {
         return false;
     }
     first.forEach((element) => {
-        if (second.filter((entry) => shallowEqual(entry, element)).length === 0){
+        if (second.filter((entry) => shallowEqual(entry, element)).length === 0) {
             return false;
         }
     })
     return true;
 }
 
-export function getWebsocketRequestOptions(source){
+/**
+ * Generates RequestOptions to establish a websocket connection for the source parameter resource
+ * @param {string} source - resource to which a websocket should be provided.
+ * @return {{redirect: string, headers: Headers, method: string, body: string}} RequestOptions to request a websocket connection to source parameter
+ */
+export function getWebsocketRequestOptions(source) {
     let myHeaders = new Headers();
     myHeaders.append("Content-Type", "application/ld+json");
 

From 1c7996c891f8eb49412cb04d8003c2dd8e360455 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Wed, 16 Aug 2023 14:01:32 +0200
Subject: [PATCH 16/42] added entry in TESTS.md

---
 TESTS.md | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/TESTS.md b/TESTS.md
index 8ee6a79..fb08403 100644
--- a/TESTS.md
+++ b/TESTS.md
@@ -27,4 +27,26 @@ Set the `id` section to the id of an existing Google Sheet.
 2. Wait at least the configured amount of milliseconds as configured under `interval` in the configuration file (default 5000).
 
 ### Postconditions
-- The changes are correctly converted and written back to the resource `http://localhost:3000/example/software`.
\ No newline at end of file
+- The changes are correctly converted and written back to the resource `http://localhost:3000/example/software`.
+
+##  Test if changes on the Pod are synced back to the Google Sheet
+
+### Preconditions
+- Follow and execute all steps in the "cold start" test above.
+
+### Steps
+Using postman or another software to make requests, send 
+```
+@prefix solid: <http://www.w3.org/ns/solid/terms#>.
+@prefix software: <https://data.knows.idlab.ugent.be/person/office/software#>.
+@prefix schema: <http://schema.org/>.
+_:rename a solid:InsertDeletePatch;
+solid:inserts { software:test schema:name "test"; schema:description "abracadabra". }.
+```
+The resource endpoint ([http://localhost:3000/example/softwate](http://localhost:3000/example/softwate)).
+
+When using websockets, the change should be almost immediately be shown, 
+otherwise wait at least the configured amount of milliseconds as configured under interval in the configuration file (default 5000).
+
+### Postconditions
+- The changes are correctly converted and visible in the google sheet
\ No newline at end of file

From 83a5d0d4315d25afeb74a192cf678957343ca99e Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 08:43:01 +0200
Subject: [PATCH 17/42] remove .idea from gitignore

---
 .gitignore | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index a2c10e5..6e0ddc0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-.idea/
 src/testing.js
 .env
 config.yml

From c345d437934e449a454288408fc74d894a0e48da Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 08:45:15 +0200
Subject: [PATCH 18/42] rename page to sheet

---
 src/google.js | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/google.js b/src/google.js
index 39ba5f5..6950d6b 100644
--- a/src/google.js
+++ b/src/google.js
@@ -57,12 +57,12 @@ export async function writeToSheet(array, sheetId) {
 /**
  * Pull data from the sheet and check if there are any changes with the previously pulled data.
  * @param {String} sheetId - ID of the Google sheet from which the data should be pulled and checked.
- * @param {String} pageName - Name of the excel page to check
+ * @param {String} sheetName - Name of the excel page to check
  * @return {Promise<{Boolean, Array}>} - 2D-array containing the latest data from the sheet
  * and a boolean indicating a possible change.
  */
-export async function checkSheetForChanges(sheetId, pageName) {
-    const rows = await getFromSheet(sheetId, pageName);
+export async function checkSheetForChanges(sheetId, sheetName) {
+    const rows = await getFromSheet(sheetId, sheetName);
     const hasChanged = previousRows !== undefined && !areArraysEqual(rows, previousRows);
     previousRows = rows;
     return {
@@ -74,13 +74,13 @@ export async function checkSheetForChanges(sheetId, pageName) {
 /**
  * Get the data from the sheet in the initial range.
  * @param {String} sheetId - ID from the sheet from which the data should be pulled.
- * @param {String} pageName - Name of the excel page to check
+ * @param {String} sheetName - Name of the excel page to check
  * @return {Array} 2D-array containing the data from the sheet.
  */
-async function getFromSheet(sheetId, pageName) {
+async function getFromSheet(sheetId, sheetName) {
     const response = await sheets.spreadsheets.values.get({
         spreadsheetId: sheetId,
-        range: pageName
+        range: sheetName
     });
 
     return response.data.values;

From c547d5c37963644bdfe5e8568d83aa0b470037e7 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 08:46:04 +0200
Subject: [PATCH 19/42] variable name to camel case

---
 src/main.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/main.js b/src/main.js
index 996175b..1cf41d7 100644
--- a/src/main.js
+++ b/src/main.js
@@ -190,11 +190,11 @@ async function startFromFile(configPath, rulesPath) {
     console.log("Synchronisation cold start completed");
     // Pod -> Sheet sync
 
-    let websocket_endpoints = await getNotificationChannelTypes(config.host + "/.well-known/solid");
+    let websocketEndpoints = await getNotificationChannelTypes(config.host + "/.well-known/solid");
 
-    if (websocket_endpoints.length > 0 && websocket_endpoints[0].length > 0 && (!config.debug_noWebSockets)) {
+    if (websocketEndpoints.length > 0 && websocketEndpoints[0].length > 0 && (!config.debug_noWebSockets)) {
         // listen using websockets
-        let url = websocket_endpoints[0]
+        let url = websocketEndpoints[0]
         let requestOptions = getWebsocketRequestOptions(config.source)
 
         let response = await (await fetch(url, requestOptions)).json()

From 84e1f3b0aee1100c234a9fd122519bd1cfa52e30 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:03:24 +0200
Subject: [PATCH 20/42] better compareArrays function

---
 src/util.js | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/src/util.js b/src/util.js
index 079ed77..00f42df 100644
--- a/src/util.js
+++ b/src/util.js
@@ -26,14 +26,15 @@ export function shallowEqual(obj1, obj2) {
  * Compares 2 arrays and checks if they contain the same objects (order doesn't matter)
  * @param {Object[]} first
  * @param {Object[]} second
+ * @param {function(Object, Object): boolean } comparator
  * @returns {boolean} Boolean that indicates if the arrays are equal (not counting order)
  */
-export function compareArrays(first, second) {
+export function compareArrays(first, second, comparator = shallowEqual) {
     if (first.length !== second.length) {
         return false;
     }
     first.forEach((element) => {
-        if (second.filter((entry) => shallowEqual(entry, element)).length === 0) {
+        if (second.filter((entry) => comparator(entry, element)).length === 0) {
             return false;
         }
     })
@@ -50,17 +51,12 @@ export function getWebsocketRequestOptions(source) {
     myHeaders.append("Content-Type", "application/ld+json");
 
     let raw = JSON.stringify({
-        "@context": [
-            "https://www.w3.org/ns/solid/notification/v1"
-        ],
+        "@context": ["https://www.w3.org/ns/solid/notification/v1"],
         "type": "http://www.w3.org/ns/solid/notifications#WebSocketChannel2023",
         "topic": source
     });
 
     return {
-        method: 'POST',
-        headers: myHeaders,
-        body: raw,
-        redirect: 'follow'
+        method: 'POST', headers: myHeaders, body: raw, redirect: 'follow'
     };
 }
\ No newline at end of file

From 4943ee4fee0780b2477c1fc93636f5f6b105a7df Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:04:25 +0200
Subject: [PATCH 21/42] more docs

---
 src/util.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/util.js b/src/util.js
index 00f42df..cfd1c0a 100644
--- a/src/util.js
+++ b/src/util.js
@@ -1,7 +1,7 @@
 /**
  * Compares objects - checks keys and values
- * @param {Object} obj1
- * @param {Object} obj2
+ * @param {Object} obj1 - first object to compare
+ * @param {Object} obj2 - second object to compare
  * @returns {boolean} Boolean that indicates if the objects are equal
  */
 export function shallowEqual(obj1, obj2) {
@@ -24,9 +24,9 @@ export function shallowEqual(obj1, obj2) {
 
 /**
  * Compares 2 arrays and checks if they contain the same objects (order doesn't matter)
- * @param {Object[]} first
- * @param {Object[]} second
- * @param {function(Object, Object): boolean } comparator
+ * @param {Object[]} first - first array of objects to compare
+ * @param {Object[]} second - second array of objects to compare
+ * @param {function(Object, Object): boolean } comparator - comparator function to use. Defaults to shallowEqual
  * @returns {boolean} Boolean that indicates if the arrays are equal (not counting order)
  */
 export function compareArrays(first, second, comparator = shallowEqual) {

From 1818f1967c0d30bb421eb3a8bb90eaef8af9df53 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:18:01 +0200
Subject: [PATCH 22/42] fix discarded return value foreach

---
 src/util.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/util.js b/src/util.js
index cfd1c0a..93e02f9 100644
--- a/src/util.js
+++ b/src/util.js
@@ -33,11 +33,11 @@ export function compareArrays(first, second, comparator = shallowEqual) {
     if (first.length !== second.length) {
         return false;
     }
-    first.forEach((element) => {
+    for (const element of first) {
         if (second.filter((entry) => comparator(entry, element)).length === 0) {
             return false;
         }
-    })
+    }
     return true;
 }
 

From f7cccc13be102cb0d20bccaee931edc4e5be6a95 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:19:18 +0200
Subject: [PATCH 23/42] refactor to not use previousMap variable

---
 src/main.js | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/main.js b/src/main.js
index 1cf41d7..27039ff 100644
--- a/src/main.js
+++ b/src/main.js
@@ -11,7 +11,6 @@ let config = {};
 
 // Array containing all quads on the sheet when the last change was detected.
 let previousQuads;
-let previousMap;
 
 /**
  * Parse YAML data and store it in the configuration object.
@@ -183,13 +182,12 @@ async function startFromFile(configPath, rulesPath) {
     await makeClient();
     const rows = await writeToSheet(arrays, config.sheetid);
     const maps = rowsToObjects(rows);
-    previousMap = maps;
     previousQuads = await objectsToRdf({data: maps}, rml);
 
 
     console.log("Synchronisation cold start completed");
-    // Pod -> Sheet sync
 
+    // Pod -> Sheet sync
     let websocketEndpoints = await getNotificationChannelTypes(config.host + "/.well-known/solid");
 
     if (websocketEndpoints.length > 0 && websocketEndpoints[0].length > 0 && (!config.debug_noWebSockets)) {
@@ -206,10 +204,10 @@ async function startFromFile(configPath, rulesPath) {
                 const {results} = await queryResource(config, true);
                 const arrays = mapsTo2DArray(results);
                 const maps = rowsToObjects(arrays);
-                if (!compareArrays(maps, previousMap)) {
+                const quads = await objectsToRdf({data: maps}, rml);
+                if (!compareArrays(quads, previousQuads, compareQuads)) {
                     const rows = await writeToSheet(arrays, config.sheetid);
                     const maps2 = rowsToObjects(rows);
-                    previousMap = maps2;
                     previousQuads = await objectsToRdf({data: maps2}, rml);
                 } else {
                     console.log("got notified but the latest changes are already present");
@@ -222,10 +220,10 @@ async function startFromFile(configPath, rulesPath) {
             const {results} = await queryResource(config, true);
             const arrays = mapsTo2DArray(results);
             const maps = rowsToObjects(arrays);
-            if (!compareArrays(maps, previousMap)) {
+            const quads = await objectsToRdf({data: maps}, rml);
+            if (!compareArrays(quads, previousQuads, compareQuads)) {
                 const rows = await writeToSheet(arrays, config.sheetid);
                 const maps2 = rowsToObjects(rows);
-                previousMap = maps2;
                 previousQuads = await objectsToRdf({data: maps2}, rml);
             }
         }, config.interval);
@@ -237,7 +235,6 @@ async function startFromFile(configPath, rulesPath) {
         if (hasChanged) {
             console.log("Changes detected. Synchronizing...");
             const maps = rowsToObjects(rows);
-            previousMap = maps;
 
             const quads = await objectsToRdf({data: maps}, rml);
 

From 705fa353e0631c39805e31097f5738eaeac0732d Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:23:44 +0200
Subject: [PATCH 24/42] docs for getNotificationChannelTypes

---
 src/solid.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/solid.js b/src/solid.js
index 59bb144..776929b 100644
--- a/src/solid.js
+++ b/src/solid.js
@@ -41,6 +41,11 @@ export async function queryResource(config, noCache = false) {
     });
 }
 
+/**
+ * Query the available websocket channels that may be listed in a given endpoint
+ * @param {string} url - host to query (e.g. http://localhost:3000/.well-known/solid/)
+ * @returns {Promise<string[]>} list of available endpoints to request a websocket connection
+ */
 export async function getNotificationChannelTypes(url){
     const myEngine = new QueryEngine();
     const result = await (await myEngine.queryBindings(`

From 68ff9b3bf028d709f9c834b35e2f1791eebd7eb5 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:25:59 +0200
Subject: [PATCH 25/42] fix return types in docs

---
 src/google.js         | 2 +-
 src/rdf-generation.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/google.js b/src/google.js
index 6950d6b..fc88f85 100644
--- a/src/google.js
+++ b/src/google.js
@@ -75,7 +75,7 @@ export async function checkSheetForChanges(sheetId, sheetName) {
  * Get the data from the sheet in the initial range.
  * @param {String} sheetId - ID from the sheet from which the data should be pulled.
  * @param {String} sheetName - Name of the excel page to check
- * @return {Array} 2D-array containing the data from the sheet.
+ * @return {Promise<Array>} 2D-array containing the data from the sheet.
  */
 async function getFromSheet(sheetId, sheetName) {
     const response = await sheets.spreadsheets.values.get({
diff --git a/src/rdf-generation.js b/src/rdf-generation.js
index 91901ad..42498c4 100644
--- a/src/rdf-generation.js
+++ b/src/rdf-generation.js
@@ -31,7 +31,7 @@ export async function objectsToRdf(data, rml) {
 /**
  * Convert a String containing RDF data into quad objects.
  * @param {String} text - A string containing the RDF data.
- * @return {[quad]} Parsed quad objects.
+ * @return {Promise<[quad]>} Parsed quad objects.
  */
 async function convertRdfToQuads(text) {
     const parser = new Parser();

From 4cf51a90da8c8fb0c839671e4934fc6544be47c0 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:32:19 +0200
Subject: [PATCH 26/42] update readme + example configs

---
 README.md                 | 22 ++++++++++++++++------
 config.fields.example.yml |  3 ++-
 config.query.example.yml  |  3 ++-
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index de4ecac..ff7d656 100644
--- a/README.md
+++ b/README.md
@@ -77,12 +77,6 @@ The `sheet` section of the configuration file contains settings related to a spe
 #### id (string)
 This parameter allows you to specify an id for the Google sheet that should be read and/or altered.
 
-example:
-```yaml
-sheet:
-  id: "ABCD1234"
-```
-
 To find the id of your Google sheet, look at the URL of the Google Sheet in the address bar of your web browser.
 The URL should look something like this:
 ```
@@ -92,6 +86,19 @@ https://docs.google.com/spreadsheets/d/DOCUMENT_ID/edit#gid=0
 Here, "DOCUMENT_ID" will be a long string of characters, letters, and numbers. 
 This is the unique identifier for the Google Sheet.
 
+#### name (string)
+This parameter allows you to specify a name for the google sheet that should be read and/or altered. \
+This is the name of the tab on the bottom left that you want to read and/or alter
+
+example:
+
+```yaml
+sheet:
+  id: "ABCD1234"
+  name: "Sheet1"
+```
+
+
 
 ### Using Fields for Data Retrieving
 Instead of using a single, user defined SPARQL query as in the previous method, the user can use the `fields` option 
@@ -154,3 +161,6 @@ write back changes from the Google Sheet back to a single destination.
 ### Public read/write authorization
 It is required for the resource specified in the configuration file to have public read and write access,
 as the agent has no support for authentication.
+
+### No 2 applications write at the same time.
+Currently, it is not handled when the sheet and the resource in the pod are updated at exactly the same time.
\ No newline at end of file
diff --git a/config.fields.example.yml b/config.fields.example.yml
index 57647bb..dda61ef 100644
--- a/config.fields.example.yml
+++ b/config.fields.example.yml
@@ -8,4 +8,5 @@ fields:
     - logo: "<http://schema.org/logo>"
 
 sheet:
-  id: "ABCD1234"
\ No newline at end of file
+  id: "ABCD1234"
+  name: "Sheet1"
\ No newline at end of file
diff --git a/config.query.example.yml b/config.query.example.yml
index f1215c0..26c4d7b 100644
--- a/config.query.example.yml
+++ b/config.query.example.yml
@@ -8,4 +8,5 @@ query: >
     }
 
 sheet:
-  id: "ABCD1234"
\ No newline at end of file
+  id: "ABCD1234"
+  name: "Sheet1"
\ No newline at end of file

From a826b5f906c341b84a3919e761c2b37009233826 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:35:41 +0200
Subject: [PATCH 27/42] update readme for debug configurations

---
 README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/README.md b/README.md
index ff7d656..c15d481 100644
--- a/README.md
+++ b/README.md
@@ -127,6 +127,16 @@ fields:
    - logo: "<http://schema.org/logo>"
 ```
 
+### Debug configurations
+
+#### websockets
+This parameter allows you to turn of websockets when you want explicit polling every X seconds.
+
+example:
+```yaml
+debug:
+  websockets: "false"
+```
 
 ### Full examples
 Full configuration examples that incorporate either the query or fields method are present in 

From 7fabfcd40619641f9f93c673cab8bbf579b7e732 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 09:51:43 +0200
Subject: [PATCH 28/42] fix comparison

---
 src/google.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/google.js b/src/google.js
index fc88f85..34b5baf 100644
--- a/src/google.js
+++ b/src/google.js
@@ -63,6 +63,8 @@ export async function writeToSheet(array, sheetId) {
  */
 export async function checkSheetForChanges(sheetId, sheetName) {
     const rows = await getFromSheet(sheetId, sheetName);
+    console.log(rows.slice(rows.length - 2, rows.length));
+    console.log(previousRows.slice(previousRows.length - 2, previousRows.length));
     const hasChanged = previousRows !== undefined && !areArraysEqual(rows, previousRows);
     previousRows = rows;
     return {
@@ -117,6 +119,9 @@ function areArraysEqual(arr1, arr2) {
     }
 
     for (let i = 0; i < arr1.length; i++) {
+        if (arr1[i].length !== arr2[i].length) {
+            return false;
+        }
         for (let j = 0; j < arr1[i].length; j++) {
             if (arr1[i][j] !== arr2[i][j]) {
                 return false;

From 2423de493e147850bd851d7398a660768a06bae7 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 10:01:06 +0200
Subject: [PATCH 29/42] add host to config

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index c15d481..cc32e28 100644
--- a/README.md
+++ b/README.md
@@ -53,9 +53,15 @@ The synchronisation application is configured through the `config.yml` file.
 This parameter allows a user to specify a resource. 
 This resource should be represented as a URI to a Solid pod from which the data will be fetched.
 
+
+#### host (string)
+This parameter allows a user to specify the host of a resource.
+This is required to use the websocket protocol to listen for changes on the resource.
+
 example:
 ```yaml
 resource: "https://data.knows.idlab.ugent.be/person/office/software"
+host: "http://data.knows.idlab.ugent.be"
 ```
 
 #### query (string)

From 2e67217a6413025759a60f4be3cc925e0ad19942 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 11:00:02 +0200
Subject: [PATCH 30/42] remove console.log

---
 src/google.js | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/google.js b/src/google.js
index 34b5baf..1e1dda0 100644
--- a/src/google.js
+++ b/src/google.js
@@ -63,8 +63,6 @@ export async function writeToSheet(array, sheetId) {
  */
 export async function checkSheetForChanges(sheetId, sheetName) {
     const rows = await getFromSheet(sheetId, sheetName);
-    console.log(rows.slice(rows.length - 2, rows.length));
-    console.log(previousRows.slice(previousRows.length - 2, previousRows.length));
     const hasChanged = previousRows !== undefined && !areArraysEqual(rows, previousRows);
     previousRows = rows;
     return {

From be94f3622f386e128b9d1fefced8f22be15904c8 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:15:54 +0200
Subject: [PATCH 31/42] fix faulty url

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index cc32e28..382d559 100644
--- a/README.md
+++ b/README.md
@@ -60,8 +60,8 @@ This is required to use the websocket protocol to listen for changes on the reso
 
 example:
 ```yaml
-resource: "https://data.knows.idlab.ugent.be/person/office/software"
-host: "http://data.knows.idlab.ugent.be"
+resource: "http://localhost:3000/example/software"
+host: "http://localhost:3000"
 ```
 
 #### query (string)

From 0191662a5778770953e2180876d1a686579ab76e Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:17:31 +0200
Subject: [PATCH 32/42] capitalize + usage sync + add interval to readme +
 websockets

---
 README.md | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 382d559..44915e3 100644
--- a/README.md
+++ b/README.md
@@ -93,8 +93,13 @@ Here, "DOCUMENT_ID" will be a long string of characters, letters, and numbers.
 This is the unique identifier for the Google Sheet.
 
 #### name (string)
-This parameter allows you to specify a name for the google sheet that should be read and/or altered. \
-This is the name of the tab on the bottom left that you want to read and/or alter
+This parameter allows you to specify a name for the Google sheet that should be read and/or altered. \
+This is the name of the tab on the bottom left that you want to sync.
+
+
+#### interval (int)
+This parameter allows you to specify the number of milliseconds between polls.
+This number will be used for polling the sheet for changes and polling the pod for changes when websockets aren't used.
 
 example:
 
@@ -102,6 +107,7 @@ example:
 sheet:
   id: "ABCD1234"
   name: "Sheet1"
+  interval: 1000
 ```
 
 
@@ -136,7 +142,8 @@ fields:
 ### Debug configurations
 
 #### websockets
-This parameter allows you to turn of websockets when you want explicit polling every X seconds.
+This parameter allows you to turn off websockets when you want explicit polling every 5 seconds.
+This value can de modified using the `interval` option from the Google Sheet configuration.
 
 example:
 ```yaml

From 465a76dffee604fa35a9edfcecc6a51ff01093ff Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:20:51 +0200
Subject: [PATCH 33/42] fix active voice

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 44915e3..4f43113 100644
--- a/README.md
+++ b/README.md
@@ -186,4 +186,4 @@ It is required for the resource specified in the configuration file to have publ
 as the agent has no support for authentication.
 
 ### No 2 applications write at the same time.
-Currently, it is not handled when the sheet and the resource in the pod are updated at exactly the same time.
\ No newline at end of file
+Currently, it is not handled when the sheet and another application try to update the resource in the pod at exactly the same time.
\ No newline at end of file

From 6aa75ff39fb3c0d227a8b4e4537e40446f012463 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:21:17 +0200
Subject: [PATCH 34/42] add curl request

---
 TESTS.md | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/TESTS.md b/TESTS.md
index fb08403..dea65cf 100644
--- a/TESTS.md
+++ b/TESTS.md
@@ -35,18 +35,12 @@ Set the `id` section to the id of an existing Google Sheet.
 - Follow and execute all steps in the "cold start" test above.
 
 ### Steps
-Using postman or another software to make requests, send 
+The pod can be updated with the following request:
+```curl
+curl --location --request PATCH 'http://localhost:3000/example/software' --header 'Content-Type: text/n3' --data-raw '@prefix solid: <http://www.w3.org/ns/solid/terms#>. @prefix software: <https://data.knows.idlab.ugent.be/person/office/software#>. @prefix schema: <http://schema.org/>. _:rename a solid:InsertDeletePatch; solid:inserts { software:test schema:name "test"; schema:description "abracadabra". }.'
 ```
-@prefix solid: <http://www.w3.org/ns/solid/terms#>.
-@prefix software: <https://data.knows.idlab.ugent.be/person/office/software#>.
-@prefix schema: <http://schema.org/>.
-_:rename a solid:InsertDeletePatch;
-solid:inserts { software:test schema:name "test"; schema:description "abracadabra". }.
-```
-The resource endpoint ([http://localhost:3000/example/softwate](http://localhost:3000/example/softwate)).
-
 When using websockets, the change should be almost immediately be shown, 
-otherwise wait at least the configured amount of milliseconds as configured under interval in the configuration file (default 5000).
+otherwise wait at least the configured amount of milliseconds (default 5000ms).
 
 ### Postconditions
 - The changes are correctly converted and visible in the google sheet
\ No newline at end of file

From 0d3bbaacc19bb3c53c0ef51a0d42e3c6fef2be09 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:21:38 +0200
Subject: [PATCH 35/42] docs on function naming

---
 src/util.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/util.js b/src/util.js
index 93e02f9..db311d9 100644
--- a/src/util.js
+++ b/src/util.js
@@ -1,5 +1,6 @@
 /**
  * Compares objects - checks keys and values
+ * Called shallowEqual because javascript's `===` checks equality from objects on memory level, and not value level.
  * @param {Object} obj1 - first object to compare
  * @param {Object} obj2 - second object to compare
  * @returns {boolean} Boolean that indicates if the objects are equal

From f1efe993f186caf149d4ad7549b738e161688fad Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:21:56 +0200
Subject: [PATCH 36/42] add interval to example config

---
 config.fields.example.yml | 3 ++-
 config.query.example.yml  | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/config.fields.example.yml b/config.fields.example.yml
index dda61ef..283325e 100644
--- a/config.fields.example.yml
+++ b/config.fields.example.yml
@@ -9,4 +9,5 @@ fields:
 
 sheet:
   id: "ABCD1234"
-  name: "Sheet1"
\ No newline at end of file
+  name: "Sheet1"
+  interval: 10000
\ No newline at end of file
diff --git a/config.query.example.yml b/config.query.example.yml
index 26c4d7b..8bf6e74 100644
--- a/config.query.example.yml
+++ b/config.query.example.yml
@@ -9,4 +9,5 @@ query: >
 
 sheet:
   id: "ABCD1234"
-  name: "Sheet1"
\ No newline at end of file
+  name: "Sheet1"
+  interval: 10000
\ No newline at end of file

From 1def2a5b52bb53f56ec155e114fb24eed9c52b5a Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:25:21 +0200
Subject: [PATCH 37/42] passive to active voice + typo fix

---
 TESTS.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/TESTS.md b/TESTS.md
index dea65cf..d855905 100644
--- a/TESTS.md
+++ b/TESTS.md
@@ -27,7 +27,7 @@ Set the `id` section to the id of an existing Google Sheet.
 2. Wait at least the configured amount of milliseconds as configured under `interval` in the configuration file (default 5000).
 
 ### Postconditions
-- The changes are correctly converted and written back to the resource `http://localhost:3000/example/software`.
+- The resource `http://localhost:3000/example/software` contains the new data.
 
 ##  Test if changes on the Pod are synced back to the Google Sheet
 
@@ -39,8 +39,8 @@ The pod can be updated with the following request:
 ```curl
 curl --location --request PATCH 'http://localhost:3000/example/software' --header 'Content-Type: text/n3' --data-raw '@prefix solid: <http://www.w3.org/ns/solid/terms#>. @prefix software: <https://data.knows.idlab.ugent.be/person/office/software#>. @prefix schema: <http://schema.org/>. _:rename a solid:InsertDeletePatch; solid:inserts { software:test schema:name "test"; schema:description "abracadabra". }.'
 ```
-When using websockets, the change should be almost immediately be shown, 
+When using websockets, the change should be almost immediately shown, 
 otherwise wait at least the configured amount of milliseconds (default 5000ms).
 
 ### Postconditions
-- The changes are correctly converted and visible in the google sheet
\ No newline at end of file
+- The Google sheet contains the new data.
\ No newline at end of file

From 821c4b348e445b3c617c8b31203040836bbdebec Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 14:26:18 +0200
Subject: [PATCH 38/42] excel => sheet

---
 src/google.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/google.js b/src/google.js
index 1e1dda0..bc3057e 100644
--- a/src/google.js
+++ b/src/google.js
@@ -57,7 +57,7 @@ export async function writeToSheet(array, sheetId) {
 /**
  * Pull data from the sheet and check if there are any changes with the previously pulled data.
  * @param {String} sheetId - ID of the Google sheet from which the data should be pulled and checked.
- * @param {String} sheetName - Name of the excel page to check
+ * @param {String} sheetName - Name of the Sheet page to check
  * @return {Promise<{Boolean, Array}>} - 2D-array containing the latest data from the sheet
  * and a boolean indicating a possible change.
  */
@@ -74,7 +74,7 @@ export async function checkSheetForChanges(sheetId, sheetName) {
 /**
  * Get the data from the sheet in the initial range.
  * @param {String} sheetId - ID from the sheet from which the data should be pulled.
- * @param {String} sheetName - Name of the excel page to check
+ * @param {String} sheetName - Name of the Sheet page to check
  * @return {Promise<Array>} 2D-array containing the data from the sheet.
  */
 async function getFromSheet(sheetId, sheetName) {

From 822e783d2f7e8cc220d1f4a17e14794e8d285940 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 16:41:11 +0200
Subject: [PATCH 39/42] add missing host value to yaml files

---
 config.fields.example.yml | 1 +
 config.query.example.yml  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/config.fields.example.yml b/config.fields.example.yml
index 283325e..c073c7c 100644
--- a/config.fields.example.yml
+++ b/config.fields.example.yml
@@ -1,4 +1,5 @@
 resource: "http://localhost:3000/example/software"
+host: "http://localhost:3000"
 
 fields:
   required:
diff --git a/config.query.example.yml b/config.query.example.yml
index 8bf6e74..8cc8b2d 100644
--- a/config.query.example.yml
+++ b/config.query.example.yml
@@ -1,4 +1,5 @@
 resource: "http://localhost:3000/example/software"
+host: "http://localhost:3000"
 
 query: >
   SELECT DISTINCT * WHERE {

From 9f48615bb06748597284bf3d098611044c831616 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 16:49:01 +0200
Subject: [PATCH 40/42] fixes readme

---
 README.md | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 4f43113..c6c0084 100644
--- a/README.md
+++ b/README.md
@@ -49,12 +49,12 @@ The synchronisation app can now read and use these tokes to access the Google Sh
 
 The synchronisation application is configured through the `config.yml` file.
 
-#### resource (string)
+### resource (string)
 This parameter allows a user to specify a resource. 
 This resource should be represented as a URI to a Solid pod from which the data will be fetched.
 
 
-#### host (string)
+### host (string)
 This parameter allows a user to specify the host of a resource.
 This is required to use the websocket protocol to listen for changes on the resource.
 
@@ -64,7 +64,7 @@ resource: "http://localhost:3000/example/software"
 host: "http://localhost:3000"
 ```
 
-#### query (string)
+### query (string)
 This parameter allows a user to define a SPARQL query that will be used to retrieve data from the specified data sources.
 
 example:
@@ -99,7 +99,8 @@ This is the name of the tab on the bottom left that you want to sync.
 
 #### interval (int)
 This parameter allows you to specify the number of milliseconds between polls.
-This number will be used for polling the sheet for changes and polling the pod for changes when websockets aren't used.
+The code will poll the sheet for changes after the specified number of milliseconds.
+The code will also poll the pod after this amount of milliseconds when websockets aren't used.
 
 example:
 
@@ -143,7 +144,7 @@ fields:
 
 #### websockets
 This parameter allows you to turn off websockets when you want explicit polling every 5 seconds.
-This value can de modified using the `interval` option from the Google Sheet configuration.
+The `interval` option from the Google Sheet configuration changes this value.
 
 example:
 ```yaml
@@ -185,5 +186,5 @@ write back changes from the Google Sheet back to a single destination.
 It is required for the resource specified in the configuration file to have public read and write access,
 as the agent has no support for authentication.
 
-### No 2 applications write at the same time.
+### No 2 applications write at the same time
 Currently, it is not handled when the sheet and another application try to update the resource in the pod at exactly the same time.
\ No newline at end of file

From 6b3534e3135a3fef675e4c74e05c5f58e87c8236 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Thu, 17 Aug 2023 16:50:37 +0200
Subject: [PATCH 41/42] change markdown type to shell

---
 TESTS.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/TESTS.md b/TESTS.md
index d855905..786c851 100644
--- a/TESTS.md
+++ b/TESTS.md
@@ -36,7 +36,7 @@ Set the `id` section to the id of an existing Google Sheet.
 
 ### Steps
 The pod can be updated with the following request:
-```curl
+```shell
 curl --location --request PATCH 'http://localhost:3000/example/software' --header 'Content-Type: text/n3' --data-raw '@prefix solid: <http://www.w3.org/ns/solid/terms#>. @prefix software: <https://data.knows.idlab.ugent.be/person/office/software#>. @prefix schema: <http://schema.org/>. _:rename a solid:InsertDeletePatch; solid:inserts { software:test schema:name "test"; schema:description "abracadabra". }.'
 ```
 When using websockets, the change should be almost immediately shown, 

From 5d83c40999d316fe21a6d937e0938a50730cf478 Mon Sep 17 00:00:00 2001
From: sevrijss <seppe.vanrijsselberghe@gmail.com>
Date: Fri, 18 Aug 2023 08:55:07 +0200
Subject: [PATCH 42/42] remove debug part from config yaml, moved websockets to
 yaml root

---
 src/main.js | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/main.js b/src/main.js
index 27039ff..95e6480 100644
--- a/src/main.js
+++ b/src/main.js
@@ -67,10 +67,8 @@ function ymlContentToConfig(ymlContent) {
         throw new Error("Error parsing YAML: host value should be specified")
     }
 
-    if (configJson.debug){
-        if (configJson.debug.websockets) {
-            config.debug_noWebSockets = configJson.debug.websockets === "false"
-        }
+    if (configJson.websockets) {
+        config.noWebsockets = configJson.websockets === "false"
     }
 
     config.interval = configJson.sheet.interval ? configJson.sheet.interval : 5000;
@@ -190,7 +188,7 @@ async function startFromFile(configPath, rulesPath) {
     // Pod -> Sheet sync
     let websocketEndpoints = await getNotificationChannelTypes(config.host + "/.well-known/solid");
 
-    if (websocketEndpoints.length > 0 && websocketEndpoints[0].length > 0 && (!config.debug_noWebSockets)) {
+    if (websocketEndpoints.length > 0 && websocketEndpoints[0].length > 0 && (!config.noWebsockets)) {
         // listen using websockets
         let url = websocketEndpoints[0]
         let requestOptions = getWebsocketRequestOptions(config.source)