feat(fun/dt): Implement useful utility
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16
fun/dt/CMakeLists.txt
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16
fun/dt/CMakeLists.txt
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# -*- mode: cmake; -*-
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cmake_minimum_required(VERSION 3.16)
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project(dt)
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add_executable(dt dt.cc)
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find_package(absl REQUIRED)
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target_link_libraries(dt
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absl::flags
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absl::flags_parse
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absl::hash
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absl::time
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absl::strings
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farmhash
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)
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install(TARGETS dt DESTINATION bin)
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11
fun/dt/README.md
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fun/dt/README.md
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dt
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==
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It's got a purpose.
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## Usage:
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```
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nix-build -E '(import (builtins.fetchGit "https://git.tazj.in/") {}).fun.dt'
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./result/bin/dt --one ... --two ...
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```
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14
fun/dt/default.nix
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fun/dt/default.nix
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{ depot, pkgs, ... }:
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let
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stdenv = with pkgs; overrideCC clangStdenv clang_9;
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abseil-cpp = pkgs.abseil-cpp.override { inherit stdenv; };
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in stdenv.mkDerivation {
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name = "dt";
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src = ./.;
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nativeBuildInputs = [ pkgs.cmake ];
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buildInputs = with pkgs; [
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abseil-cpp
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farmhash
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];
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}
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56
fun/dt/dt.cc
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fun/dt/dt.cc
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#include <iostream>
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#include "absl/flags/flag.h"
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#include "absl/flags/parse.h"
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#include "absl/hash/hash.h"
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#include "absl/time/time.h"
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#include "absl/time/clock.h"
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#include "absl/strings/str_cat.h"
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#include "farmhash.h"
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ABSL_FLAG(std::string, one, "", "first word");
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ABSL_FLAG(std::string, two, "", "second word");
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ABSL_FLAG(int, range, 100, "operating range");
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void which(std::string one, std::string two) {
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if (util::Fingerprint64(one) > util::Fingerprint64(two)) {
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std::cout << one << std::endl;
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} else {
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std::cout << two << std::endl;
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}
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}
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std::string decide(std::string one, std::string two) {
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auto date = absl::FormatTime("%Y%m%d", absl::Now(), absl::UTCTimeZone());
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auto base = util::Fingerprint64(absl::StrCat(date, one, two))
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% (absl::GetFlag(FLAGS_range) + 1);
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if (base % 10 == 0) {
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return "c2";
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} else if (base % 9 == 0) {
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which(one, two);
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return "c1";
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} else if (base % 8 == 0) {
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return "e2";
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} else if (base % 7 == 0) {
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which(one, two);
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return "e1";
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} else if (base % 3 == 0) {
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return "skip";
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}
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return "nope";
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}
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int main(int argc, char *argv[]) {
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absl::ParseCommandLine(argc, argv);
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auto one = absl::GetFlag(FLAGS_one);
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auto two = absl::GetFlag(FLAGS_two);
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if (one.empty() || two.empty()) {
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std::cerr << "both are required!" << std::endl;
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return 1;
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}
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std::cout << decide(one, two) << std::endl;
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}
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