Userland: Add "ini" command to read and write .ini config files

Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/8afbf89380c
Pull-request: https://github.com/SerenityOS/serenity/pull/2769

Userland/ini.cpp

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibCore/ArgsParser.h>
+#include <LibCore/ConfigFile.h>
+#include <LibCore/File.h>
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    if (pledge("stdio rpath wpath cpath", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    const char* path = nullptr;
+    const char* group = nullptr;
+    const char* key = nullptr;
+    const char* value_to_write = nullptr;
+
+    Core::ArgsParser args_parser;
+    args_parser.add_positional_argument(path, "Path to INI file", "path");
+    args_parser.add_positional_argument(group, "Group name", "group");
+    args_parser.add_positional_argument(key, "Key name", "key");
+    args_parser.add_positional_argument(value_to_write, "Value to write", "value", Core::ArgsParser::Required::No);
+    args_parser.parse(argc, argv);
+
+    if (!Core::File::exists(path)) {
+        fprintf(stderr, "File does not exist: '%s'\n", path);
+        return 1;
+    }
+
+    auto config = Core::ConfigFile::open(path);
+
+    if (value_to_write) {
+        config->write_entry(group, key, value_to_write);
+        config->sync();
+        return 0;
+    }
+
+    auto value = config->read_entry(group, key);
+    if (!value.is_empty())
+        printf("%s\n", value.characters());
+
+    return 0;
+}