feat(fun/dt): Implement useful utility r/707

1 files changed, 56 insertions, 0 deletions

diff --git a/fun/dt/dt.cc b/fun/dt/dt.cc
new file mode 100644
index 000000000000..895dc34051da
--- /dev/null
+++ b/fun/dt/dt.cc
@@ -0,0 +1,56 @@
+#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;
+}