feat(fun/dt): Implement useful utility

This commit is contained in:
Vincent Ambo 2020-05-08 18:55:00 +01:00
parent 28a36a2b70
commit e33627f960
4 changed files with 97 additions and 0 deletions

16
fun/dt/CMakeLists.txt Normal file
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# -*- mode: cmake; -*-
cmake_minimum_required(VERSION 3.16)
project(dt)
add_executable(dt dt.cc)
find_package(absl REQUIRED)
target_link_libraries(dt
absl::flags
absl::flags_parse
absl::hash
absl::time
absl::strings
farmhash
)
install(TARGETS dt DESTINATION bin)

11
fun/dt/README.md Normal file
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dt
==
It's got a purpose.
## Usage:
```
nix-build -E '(import (builtins.fetchGit "https://git.tazj.in/") {}).fun.dt'
./result/bin/dt --one ... --two ...
```

14
fun/dt/default.nix Normal file
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{ depot, pkgs, ... }:
let
stdenv = with pkgs; overrideCC clangStdenv clang_9;
abseil-cpp = pkgs.abseil-cpp.override { inherit stdenv; };
in stdenv.mkDerivation {
name = "dt";
src = ./.;
nativeBuildInputs = [ pkgs.cmake ];
buildInputs = with pkgs; [
abseil-cpp
farmhash
];
}

56
fun/dt/dt.cc Normal file
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#include <iostream>
#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include "absl/hash/hash.h"
#include "absl/time/time.h"
#include "absl/time/clock.h"
#include "absl/strings/str_cat.h"
#include "farmhash.h"
ABSL_FLAG(std::string, one, "", "first word");
ABSL_FLAG(std::string, two, "", "second word");
ABSL_FLAG(int, range, 100, "operating range");
void which(std::string one, std::string two) {
if (util::Fingerprint64(one) > util::Fingerprint64(two)) {
std::cout << one << std::endl;
} else {
std::cout << two << std::endl;
}
}
std::string decide(std::string one, std::string two) {
auto date = absl::FormatTime("%Y%m%d", absl::Now(), absl::UTCTimeZone());
auto base = util::Fingerprint64(absl::StrCat(date, one, two))
% (absl::GetFlag(FLAGS_range) + 1);
if (base % 10 == 0) {
return "c2";
} else if (base % 9 == 0) {
which(one, two);
return "c1";
} else if (base % 8 == 0) {
return "e2";
} else if (base % 7 == 0) {
which(one, two);
return "e1";
} else if (base % 3 == 0) {
return "skip";
}
return "nope";
}
int main(int argc, char *argv[]) {
absl::ParseCommandLine(argc, argv);
auto one = absl::GetFlag(FLAGS_one);
auto two = absl::GetFlag(FLAGS_two);
if (one.empty() || two.empty()) {
std::cerr << "both are required!" << std::endl;
return 1;
}
std::cout << decide(one, two) << std::endl;
}