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Utilities: Improve the arp information output

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This updates the arp command to use output styles similar to other
utilities.
This commit is contained in:
brapru 2021-07-30 23:33:47 -04:00 committed by Gunnar Beutner
parent 3bd6905ea8
commit a037e0ffec
Notes: sideshowbarker 2024-07-18 07:28:52 +09:00 
Author: https://github.com/brapru
Commit: https://github.com/SerenityOS/serenity/commit/a037e0ffec5
Pull-request: https://github.com/SerenityOS/serenity/pull/9214
1 changed files with 63 additions and 9 deletions
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64
Userland/Utilities/arp.cpp
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@ -8,6 +8,7 @@
#include <AK/IPv4Address.h>
#include <AK/JsonObject.h>
#include <AK/MACAddress.h>
#include <AK/QuickSort.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <LibCore/ArgsParser.h>
@ -48,25 +49,78 @@ int main(int argc, char** argv)
args_parser.add_positional_argument(value_hw_address, "Hardware address", "hwaddress", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
enum class Alignment {
Left,
Right
};
struct Column {
String title;
Alignment alignment { Alignment::Left };
int width { 0 };
String buffer;
};
Vector<Column> columns;
int proto_address_column = -1;
int hw_address_column = -1;
auto add_column = [&](auto title, auto alignment, auto width) {
columns.append({ title, alignment, width, {} });
return columns.size() - 1;
};
proto_address_column = add_column("Address", Alignment::Left, 15);
hw_address_column = add_column("HWaddress", Alignment::Left, 15);
auto print_column = [](auto& column, auto& string) {
if (!column.width) {
out("{}", string);
return;
}
if (column.alignment == Alignment::Right) {
out("{:>{1}} "sv, string, column.width);
} else {
out("{:<{1}} "sv, string, column.width);
}
};
for (auto& column : columns)
print_column(column, column.title);
outln();
if (!flag_set && !flag_delete) {
auto file = Core::File::construct("/proc/net/arp");
if (!file->open(Core::OpenMode::ReadOnly)) {
warnln("Failed to open {}: {}", file->name(), file->error_string());
return 1;
}
if (!flag_set && !flag_delete) {
outln("Address HWaddress");
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents);
VERIFY(json.has_value());
json.value().as_array().for_each([](auto& value) {
Vector<JsonValue> sorted_regions = json.value().as_array().values();
quick_sort(sorted_regions, [](auto& a, auto& b) {
return a.as_object().get("ip_address").to_string() < b.as_object().get("ip_address").to_string();
});
for (auto& value : sorted_regions) {
auto& if_object = value.as_object();
auto ip_address = if_object.get("ip_address").to_string();
auto mac_address = if_object.get("mac_address").to_string();
outln("{:15} {:17}", ip_address, mac_address);
});
if (proto_address_column != -1)
columns[proto_address_column].buffer = ip_address;
if (hw_address_column != -1)
columns[hw_address_column].buffer = mac_address;
for (auto& column : columns)
print_column(column, column.buffer);
outln();
};
}
if (flag_set || flag_delete) {