From 5e18c8eccf4ba05c9cce5672d8495c3904b66cd0 Mon Sep 17 00:00:00 2001
From: Denis Evsyukov <denis@evsyukov.org>
Date: Sat, 22 Feb 2020 21:03:52 +0300
Subject: [+] prefix function

---
 src/functions.hpp | 13 +++++++++++++
 src/main.cpp      | 14 ++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/functions.hpp b/src/functions.hpp
index 123f4ab..89e3b01 100644
--- a/src/functions.hpp
+++ b/src/functions.hpp
@@ -6,6 +6,7 @@
 #define T_FUNCTIONS_HPP
 
 #include "sha256/picosha2.h"
+#include <string>
 
 std::string &ltrim(std::string &str, const std::string &chars = "\t\n\v\f\r ") {
   str.erase(0, str.find_first_not_of(chars));
@@ -28,4 +29,16 @@ std::string sha256_hash(std::string text) {
   std::string hex_str = picosha2::bytes_to_hex_string(hash.begin(), hash.end());
   return hex_str;
 }
+
+std::string prefix(std::string hash,
+                   std::unordered_map<std::string, std::string> tasks) {
+  std::string prefix;
+  for (size_t i = 1; i <= hash.length(); i++) {
+    prefix = hash.substr(0, i);
+    if (tasks.find(prefix) == tasks.end())
+      return prefix;
+  }
+  return hash;
+}
+
 #endif // T_FUNCTIONS_HPP
diff --git a/src/main.cpp b/src/main.cpp
index cc1144f..343b9d8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,9 +1,10 @@
 #include <filesystem>
+#include <unordered_map>
 
 #include "functions.hpp"
 #include "opts/cxxopts.hpp"
 
-using namespace std;
+std::unordered_map<std::string, std::string> tasks = {};
 
 int main(int argc, char *argv[]) {
   cxxopts::Options options("MyProgram", "One line description of MyProgram");
@@ -37,7 +38,16 @@ int main(int argc, char *argv[]) {
       str += s + " ";
     }
     auto src_str = trim(str);
-    cout << "sha256('" << str << "'): " << sha256_hash(str) << endl;
+    // tasks[sha256_hash(str)] = str;
+    std::string hash = sha256_hash(str);
+    std::cout << "sha256('" << str << "'): " << hash << std::endl;
+
+    // for (const auto &n : tasks) {
+    //   std::cout << "Key:[" << n.first << "] Value:[" << n.second << "]\n";
+    // }
+
+    std::string p = prefix(hash, tasks);
+    std::cout << "prefix: " << p << std::endl;
   }
   std::string taskdir;
   if (result.count("taskdir")) {
-- 
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