Add PartialCutPaper util

Author: jose-dominguez-msp

android/build.gradle

@@ -1,10 +1,14 @@
 buildscript {
     repositories {
+        // google()
         mavenCentral()
     }
 
     dependencies {
+        // Update from 2.3.0 to at least 4.2.2 or 7.x
+        // classpath 'com.android.tools.build:gradle:4.2.2'
         classpath 'com.android.tools.build:gradle:2.3.0'
+
     }
 }
 

android/src/main/java/com/sunmi/v2/printer/BytesUtil.java

@@ -284,6 +284,16 @@ public static byte[] CutPaper() {
 																	// 66D 0D
 		return returnText;
 	}
+
+	public static byte[] PartialCutPaper() {
+		// from https://file.cdn.sunmi.com/SUNMIDOCS/SunmiPrinter-Developer-Docs-1-1.pdf
+//		byte[] returnText = {0x20,0x0A, 0x1D, 0x56, 0x41, 0x00 }; // 切纸； GS V
+																	// 66D 0D
+
+		byte[] returnText = {0x20,0x0A, 0x1D, 0x56, 0x42, 0x01 }; // 部分切纸； GS V
+																	// 66D 1D
+		return returnText;
+	}
 
 	public static byte[] selfCheck(){
 		byte[] returnText = {0x1F, 0x1B, 0x1F, 0x53};

android/src/main/java/com/sunmi/v2/printer/SunmiPrintHelper.java

@@ -175,6 +175,13 @@ public void cutpaper() throws Exception {
         sunmiPrinterService.cutPaper(null);
     }
 
+    /**
+     * Partial cut via ESC/POS command for devices/cutters that support it.
+     */
+    public void cutpaperPartial() throws Exception {
+        sendRawData(BytesUtil.PartialCutPaper());
+    }
+
     /**
      *  Initialize the printer
      *  All style settings will be restored to default

android/src/main/java/com/sunmi/v2/printer/SunmiV2PrinterModule.java

@@ -345,4 +345,15 @@ public void cutPaper(final Promise promise) {
             promise.reject("0", e.getMessage());
         }
     }
+
+    @ReactMethod
+    public void cutPaperPartial(final Promise promise) {
+        try {
+            SunmiPrintHelper.getInstance().cutpaperPartial();
+            promise.resolve(null);
+        } catch (Exception e) {
+            e.printStackTrace();
+            promise.reject("0", e.getMessage());
+        }
+    }
 }

index.d.ts

@@ -21,6 +21,7 @@ export declare const SunmiV2Printer: {
   clearBuffer: () => Promise<void>;
   openCashDrawer: () => Promise<void>;
   cutPaper: () => Promise<void>;
+  cutPaperPartial: () => Promise<void>;
   getPrinterStatus: () => Promise<
     1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 505 | 507
   >;