Userland: Add a simple JSON pretty-printing utility called /bin/jp

Userland/jp.cpp

@@ -0,0 +1,70 @@
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/JsonValue.h>
+#include <LibCore/CFile.h>
+#include <stdio.h>
+
+static void print(const JsonValue& value, int indent = 0);
+static void print_indent(int indent)
+{
+    for (int i = 0; i < indent; ++i)
+        printf("  ");
+}
+
+int main(int argc, char** argv)
+{
+    if (argc != 2) {
+        fprintf(stderr, "usage: jp <file>\n");
+        return 1;
+    }
+    CFile file(argv[1]);
+    if (!file.open(CIODevice::ReadOnly)) {
+        fprintf(stderr, "Couldn't open %s for reading: %s\n", argv[1], file.error_string());
+        return 1;
+    }
+
+    auto file_contents = file.read_all();
+    auto json = JsonValue::from_string(file_contents);
+
+    print(json);
+    printf("\n");
+
+    return 0;
+}
+
+void print(const JsonValue& value, int indent)
+{
+    if (value.is_object()) {
+        printf("{\n");
+        value.as_object().for_each_member([&](auto& member_name, auto& member_value) {
+            print_indent(indent + 1);
+            printf("\"\033[33;1m%s\033[0m\": ", member_name.characters());
+            print(member_value, indent + 1);
+            printf(",\n");
+        });
+        print_indent(indent);
+        printf("}");
+        return;
+    }
+    if (value.is_array()) {
+        printf("[\n");
+        value.as_array().for_each([&](auto& entry_value) {
+            print_indent(indent + 1);
+            print(entry_value, indent + 1);
+            printf(",\n");
+        });
+        print_indent(indent);
+        printf("]");
+        return;
+    }
+    if (value.is_string())
+        printf("\033[31;1m");
+    else if (value.is_number())
+        printf("\033[35;1m");
+    else if (value.is_bool())
+        printf("\033[32;1m");
+    else if (value.is_null() || value.is_undefined())
+        printf("\033[34;1m");
+    printf("%s", value.serialized().characters());
+    printf("\033[0m");
+}