Utilities: Rename jp to json

With the scope of `jp` expanding beyond just printing JSON (e.g.
querying JSON), `json` seems to be a more fitting name.

Userland/Utilities/json.cpp

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, Maxwell Trussell <maxtrussell@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Assertions.h>
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/JsonValue.h>
+#include <AK/StringBuilder.h>
+#include <AK/StringView.h>
+#include <AK/Types.h>
+#include <AK/Vector.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/File.h>
+#include <LibCore/System.h>
+#include <LibMain/Main.h>
+#include <unistd.h>
+
+static JsonValue query(JsonValue const& value, Vector<StringView>& key_parts, size_t key_index = 0);
+static void print(JsonValue const& value, int spaces_per_indent, int indent = 0, bool use_color = true);
+static void print_indent(int indent, int spaces_per_indent)
+{
+    for (int i = 0; i < indent * spaces_per_indent; ++i)
+        out(" ");
+}
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    TRY(Core::System::pledge("stdio rpath"));
+
+    StringView path;
+    StringView dotted_key;
+    int spaces_in_indent = 4;
+
+    Core::ArgsParser args_parser;
+    args_parser.set_general_help("Pretty-print a JSON file with syntax-coloring and indentation.");
+    args_parser.add_option(dotted_key, "Dotted query key", "query", 'q', "foo.*.bar");
+    args_parser.add_option(spaces_in_indent, "Indent size", "indent-size", 'i', "spaces_in_indent");
+    args_parser.add_positional_argument(path, "Path to JSON file", "path", Core::ArgsParser::Required::No);
+    VERIFY(spaces_in_indent >= 0);
+    args_parser.parse(arguments);
+
+    RefPtr<Core::File> file;
+    if (path == nullptr)
+        file = Core::File::standard_input();
+    else
+        file = TRY(Core::File::open(path, Core::OpenMode::ReadOnly));
+
+    TRY(Core::System::pledge("stdio"));
+
+    auto file_contents = file->read_all();
+    auto json = TRY(JsonValue::from_string(file_contents));
+    if (!dotted_key.is_empty()) {
+        auto key_parts = dotted_key.split_view('.');
+        json = query(json, key_parts);
+    }
+
+    print(json, spaces_in_indent, 0, isatty(STDOUT_FILENO));
+    outln();
+
+    return 0;
+}
+
+void print(JsonValue const& value, int spaces_per_indent, int indent, bool use_color)
+{
+    if (value.is_object()) {
+        size_t printed_members = 0;
+        auto& object = value.as_object();
+        outln("{{");
+        object.for_each_member([&](auto& member_name, auto& member_value) {
+            ++printed_members;
+            print_indent(indent + 1, spaces_per_indent);
+            if (use_color)
+                out("\"\033[33;1m{}\033[0m\": ", member_name);
+            else
+                out("\"{}\": ", member_name);
+            print(member_value, spaces_per_indent, indent + 1, use_color);
+            if (printed_members < static_cast<size_t>(object.size()))
+                out(",");
+            outln();
+        });
+        print_indent(indent, spaces_per_indent);
+        out("}}");
+        return;
+    }
+    if (value.is_array()) {
+        size_t printed_entries = 0;
+        auto array = value.as_array();
+        outln("[");
+        array.for_each([&](auto& entry_value) {
+            ++printed_entries;
+            print_indent(indent + 1, spaces_per_indent);
+            print(entry_value, spaces_per_indent, indent + 1, use_color);
+            if (printed_entries < static_cast<size_t>(array.size()))
+                out(",");
+            outln();
+        });
+        print_indent(indent, spaces_per_indent);
+        out("]");
+        return;
+    }
+    if (use_color) {
+        if (value.is_string())
+            out("\033[31;1m");
+        else if (value.is_number())
+            out("\033[35;1m");
+        else if (value.is_bool())
+            out("\033[32;1m");
+        else if (value.is_null())
+            out("\033[34;1m");
+    }
+    if (value.is_string())
+        out("\"");
+    out("{}", value.to_string());
+    if (value.is_string())
+        out("\"");
+    if (use_color)
+        out("\033[0m");
+}
+
+JsonValue query(JsonValue const& value, Vector<StringView>& key_parts, size_t key_index)
+{
+    if (key_index == key_parts.size())
+        return value;
+    auto key = key_parts[key_index++];
+
+    if (key == "*"sv) {
+        Vector<JsonValue> matches;
+        if (value.is_object()) {
+            value.as_object().for_each_member([&](auto&, auto& member_value) {
+                matches.append(query(member_value, key_parts, key_index));
+            });
+        } else if (value.is_array()) {
+            value.as_array().for_each([&](auto& member) {
+                matches.append(query(member, key_parts, key_index));
+            });
+        }
+        return JsonValue(JsonArray(matches));
+    }
+
+    JsonValue result {};
+    if (value.is_object()) {
+        result = value.as_object().get(key);
+    } else if (value.is_array()) {
+        auto key_as_index = key.to_int();
+        if (key_as_index.has_value())
+            result = value.as_array().at(key_as_index.value());
+    }
+    return query(result, key_parts, key_index);
+}