feat: Possibility to invert the position value.

README.md

@@ -14,7 +14,7 @@ Features:
 * Set target position (0-100).
 * Position change updates: push (efficient / less network and Homebridge load) or pull (easy to configure).
 * Retrieve current position.
-* Send identify request (via Eve Home app) to locate your curtain
+* Send identify request (via Eve Home app) to locate your curtain.
 
 ## Installation
 
@@ -68,7 +68,8 @@ Any `%d` format specifier will be replaced by the requested target position.
 * `getTargetPosRegEx` \<string\> **optional**: A regular expression from which the first matched group determines the target position.
 * `identifyUrl` \<string | [urlObject](#urlobject)\> **optional**: URL to call when the HomeKit identify action is requested.
 * `pullInterval` \<integer\> **optional**: The property expects an interval in **milliseconds** in which the plugin
-pulls updates from your http device. For more information read [pulling updates](#the-pull-way).  
+pulls updates from your http device. For more information read [pulling updates](#the-pull-way). 
+* `invertPosition` \<boolean\> **optional**: True: interpret 0% as fully open and 100% as fully closed.
 
 Below is an example configuration. One URL is using a simple string URL and the other is using an urlObject.  
 Both configs can be used for a basic plugin configuration.

config.schema.json

@@ -152,6 +152,12 @@
 				"description": "Leave empty to update position using push method only. Interval in milliseconds to pull position data from the curtain periodically. ",
 				"required": false,
 				"minimum": 0
+			},
+			"invertPosition": {
+				"title": "Invert position value",
+				"type": "boolean",
+				"description": "When selected will interpret 0% as fully opened and 100% as fully closed.",
+				"required": false
 			}
 		}
 	},
@@ -264,7 +270,8 @@
 					"identifyUrl.method"
 				]
 			},
-			"pullInterval"
+			"pullInterval",
+			"invertPosition"
 
 		]
 	  }

index.js

@@ -83,6 +83,8 @@ function HttpCurtain(log, config) {
         this.pullTimer.start();
     }
 
+    this.invertPosition = config.invertPosition || false
+
     api.on('didFinishLaunching', function() {
         // Check if notificationRegistration is set, if not 'notificationRegistration' is probably not installed on the system.
         if (global.notificationRegistration && typeof global.notificationRegistration === "function") {
@@ -191,9 +193,12 @@ HttpCurtain.prototype = {
                         this.log.warn("Your CurrentPosRegEx regular expression: \"%s\" did not match any part of the returned body: \"%s\"", this.getCurrentPosRegEx, body);
                     }
                 }
-                const posValue = parseInt(body);
+                let posValue = parseInt(body);
+                this.log.info("Current position (retrieved via http): %s\%", posValue);
 
-                this.log.info("Current position: %s\%", posValue);
+                if (this.invertPosition) {
+                    posValue = 100 - posValue;
+                }
 
                 callback(null, posValue);
             }
@@ -231,6 +236,10 @@ HttpCurtain.prototype = {
     setTargetPosition: function (value, callback) {
         this.targetPosition = value;
 
+        if (this.invertPosition) {
+            value = 100 - value;
+        }
+
         // Replace %d with target position.
         let urlObj = {...this.setTargetPosUrl}; 
         urlObj.url = urlObj.url.replace(/%d/g, value.toString());
@@ -246,7 +255,7 @@ HttpCurtain.prototype = {
                 callback(new Error("Got http error code " + response.statusCode));
             }
             else {
-                this.log.debug("Succesfully requested target position: %d\%", this.targetPosition);
+                this.log.debug("Succesfully requested target position: %d\%", value);
 
                 callback(null);
             }
@@ -276,9 +285,13 @@ HttpCurtain.prototype = {
                         }
                     }
 
-                    const targetPosition = parseInt(body);
+                    let targetPosition = parseInt(body);
                     this.log.info("Target position (retrieved via http): %s\%", targetPosition);
 
+                    if (this.invertPosition) {
+                        targetPosition = 100 - targetPosition;
+                    }
+
                     callback(null, targetPosition);
                 }
             });