converts: add number base conversion #log

Author: cofcool

src/main/java/net/cofcool/sourcebox/internal/Converts.java

@@ -147,6 +147,23 @@ public Arg demo() {
         }
     }
 
+    private class Hex implements Pipeline {
+
+        @Override
+        public String run(Args args) throws Exception {
+            var radix = args.readArg("radix").getVal().map(Integer::parseUnsignedInt).orElse(10);
+            var newRadix = args.readArg("nradix").getVal().map(Integer::parseUnsignedInt).orElse(2);
+            var val = Long.valueOf(args.readArg(INPUT).val(), radix);
+
+            return Long.toString(val, newRadix);
+        }
+
+        @Override
+        public Arg demo() {
+            return new Arg(getClass().getSimpleName().toLowerCase(), null, "number base conversion", false, "1970 --radix=10 --nradix=2");
+        }
+    }
+
     private class Lower implements Pipeline {
 
         @Override

src/test/java/net/cofcool/sourcebox/internal/ConvertsTest.java

@@ -166,6 +166,23 @@ void morseCode() throws Exception {
         Assertions.assertEquals("HELLO WORLD", de);
     }
 
+    @Test
+    void hex() throws Exception {
+        var en = instance().runCommand(args
+            .arg("cmd", "hex")
+            .arg("in", "1970")
+            .arg("radix", "10")
+            .arg("nradix", "2")
+        );
+        var de = instance().runCommand(args
+            .arg("cmd", "hex")
+            .arg("in", en)
+            .arg("radix", "2")
+            .arg("nradix", "10")
+        );
+        Assertions.assertEquals("1970", de);
+    }
+
     @Test
     void desdeSecurity() throws Exception {
         var en = instance().runCommand(args