feat: develop the basic functions.

.clang-format

@@ -110,8 +110,8 @@ IndentGotoLabels: false
 #   #endif
 # #endif
 IndentPPDirectives: BeforeHash
-# IndentAccessModifiers: true
 IndentWidth: 4
+AccessModifierOffset: -4
 KeepEmptyLinesAtTheStartOfBlocks: false
 MaxEmptyLinesToKeep: 3
 NamespaceIndentation: None

CMakeLists.txt

@@ -6,6 +6,9 @@ include_directories(include)
 
 find_package(CURL REQUIRED)
 find_package(nlohmann_json REQUIRED)
+find_package(GTest REQUIRED)
+
+add_subdirectory(src)
 
 add_executable(leetcode-fetcher main.cpp
         src/fetcher.cpp)

include/fetcher.h

@@ -59,25 +59,27 @@ struct CodeDefinition
 struct ProblemContent
 {
     std::string title;
-    std::string title_slug;
+    std::string titleSlug;
     std::string content;
     std::vector<CodeDefinition> codeDefinitions;
     int questionId;
 
     ProblemContent(std::string title,
-                   std::string title_slug,
+                   std::string titleSlug,
                    std::string content,
                    std::vector<CodeDefinition> codeDefinitions,
                    int questionId)
         : title(std::move(title))
-        , title_slug(std::move(title_slug))
+        , titleSlug(std::move(titleSlug))
         , content(std::move(content))
         , codeDefinitions(std::move(codeDefinitions))
         , questionId(questionId)
     {
     }
 
-    std::string formatTemplate(const std::string &templateContent) const;
+    [[nodiscard]] std::string formatTemplate(const std::string &templateContent) const;
+
+    [[nodiscard]] std::string formatFilename() const;
 };
 
 struct Fetcher
@@ -104,6 +106,8 @@ private:
 
     [[nodiscard]] std::vector<LeetCodeProblem> getProblems() const;
 
+    [[nodiscard]] std::unique_ptr<ProblemContent> fetchProblemContent(const LeetCodeProblem &problem) const;
+
     /// The callback function used by curl to write the http response content into a string.
     static size_t httpWriteCallback(void *contents, const size_t size, size_t bufferLength, void *userData)
     {
@@ -121,6 +125,8 @@ private:
         const LeetCodeProblem &problem);
 
     static std::string readTemplateFile();
+
+    static bool validateExistedProblem(const ProblemContent &problem);
 };
 
 #endif //FETCHER_H

justfile

@@ -0,0 +1,31 @@
+#!/usr/bin/env just --justfile
+
+update:
+    git pull
+
+build: update
+    #!/usr/bin/env bash
+    set -euxo pipefail
+    mkdir -p cmake-build-debug-clang
+    cd cmake-build-debug-clang
+    cmake .. -G Ninja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
+    ninja
+
+fmt:
+    clang-format -i src/problems/*.cpp
+
+test: fmt build
+    ./cmake-build-debug-clang/src/problem-tests
+
+commit: test
+    #!/usr/bin/env bash
+    set -euxo pipefail
+    time=$(date "+%Y%m%d")
+    message="$time finished."
+
+    git add -A
+    git commit -m "$message"
+    git push
+
+pull id: build
+    ./cmake-build-debug-clang/leetcode-fetcher {{ id }}

main.cpp

@@ -6,8 +6,7 @@ int main(int argc, char **argv)
 
     if (argc != 2)
     {
-        std::cout << "The fetcher expect the program id.";
-        return -1;
+        throw std::invalid_argument("The fetcher expect the program id.");
     }
 
     fetcher.fetchProblem(argv[1]);

src/CMakeLists.txt

@@ -0,0 +1,7 @@
+enable_testing()
+
+aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR}/problems PROBLEMS_SRC)
+
+add_executable(problem-tests ${PROBLEMS_SRC})
+
+target_link_libraries(problem-tests GTest::gtest_main)

src/fetcher.cpp

@@ -49,7 +49,38 @@ std::vector<LeetCodeProblem> Fetcher::getProblems() const
     return problems;
 }
 
-std::string replaceString(const std::string &original,
+std::unique_ptr<ProblemContent> Fetcher::fetchProblemContent(const LeetCodeProblem &problem) const
+{
+    curl_easy_setopt(client.get(), CURLOPT_URL, kGraphQlUrl.c_str());
+    curl_easy_setopt(client.get(), CURLOPT_POST, 1L);
+
+    curl_slist *headers = nullptr;
+    headers = curl_slist_append(headers, "Content-Type: application/json");
+
+    curl_easy_setopt(client.get(), CURLOPT_HTTPHEADER, headers);
+
+    std::string requestBody = formatQueryJson(problem.questionTitleSlug).dump();
+
+    curl_easy_setopt(client.get(), CURLOPT_POSTFIELDS, requestBody.c_str());
+    curl_easy_setopt(client.get(), CURLOPT_POSTFIELDSIZE, requestBody.size());
+
+    std::string responseBody;
+
+    curl_easy_setopt(client.get(), CURLOPT_WRITEFUNCTION, Fetcher::httpWriteCallback);
+    curl_easy_setopt(client.get(), CURLOPT_WRITEDATA, &responseBody);
+
+    CURLcode code = curl_easy_perform(client.get());
+
+    if (code != CURLE_OK)
+    {
+        throw std::runtime_error("Failed to fetch problem.");
+    }
+
+    const nlohmann::json jsonResponse = nlohmann::json::parse(responseBody);
+    return extractContentFromJson(jsonResponse, problem);
+}
+
+static std::string replaceString(const std::string &original,
                                  const std::string_view old_sub,
                                  const std::string_view new_sub)
 {
@@ -108,10 +139,21 @@ std::string ProblemContent::formatTemplate(const std::string &templateContent) c
     std::string result = replaceString(templateContent, "__PROBLEM_ID__", std::to_string(questionId));
     result = replaceString(result, "__PROBLEM_TITLE__", title);
     result = replaceString(result, "__PROBLEM_DEFAULT_CODE__", it->defaultCode);
+    std::string testCaseName = "P" + std::to_string(questionId);
+    result = replaceString(result, "__TEST_CASE_NAME__", testCaseName);
 
     return result;
 }
 
+std::string ProblemContent::formatFilename() const
+{
+    std::ostringstream stream("p");
+    stream << questionId;
+    stream << "-" << titleSlug << ".cpp";
+
+    return stream.str();
+}
+
 void Fetcher::fetchProblem(const std::string &idString) const
 {
     std::vector<LeetCodeProblem> problems = getProblems();
@@ -127,37 +169,21 @@ void Fetcher::fetchProblem(const std::string &idString) const
         throw std::runtime_error("The target problem does not exist.");
     }
 
-    curl_easy_setopt(client.get(), CURLOPT_URL, kGraphQlUrl.c_str());
-    curl_easy_setopt(client.get(), CURLOPT_POST, 1L);
+    std::unique_ptr<ProblemContent> problemContent = fetchProblemContent(*it);
+    const std::string templateFile = readTemplateFile();
+    std::string problemFileContent = problemContent->formatTemplate(templateFile);
+    std::string problemFilename = problemContent->formatFilename();
 
-    curl_slist *headers = nullptr;
-    headers = curl_slist_append(headers, "Content-Type: application/json");
+    auto problemFile = std::ofstream("src/problems/" + problemFilename);
 
-    curl_easy_setopt(client.get(), CURLOPT_HTTPHEADER, headers);
-
-    std::string requestBody = formatQueryJson(it->questionTitleSlug).dump();
-
-    curl_easy_setopt(client.get(), CURLOPT_POSTFIELDS, requestBody.c_str());
-    curl_easy_setopt(client.get(), CURLOPT_POSTFIELDSIZE, requestBody.size());
-
-    std::string responseBody;
-
-    curl_easy_setopt(client.get(), CURLOPT_WRITEFUNCTION, Fetcher::httpWriteCallback);
-    curl_easy_setopt(client.get(), CURLOPT_WRITEDATA, &responseBody);
-
-    CURLcode code = curl_easy_perform(client.get());
-
-    if (code != CURLE_OK)
+    if (!problemFile.is_open())
     {
-        throw std::runtime_error("Failed to fetch problem.");
+        throw std::runtime_error("Failed to open problem file.");
     }
 
-    const nlohmann::json jsonResponse = nlohmann::json::parse(responseBody);
-    const std::unique_ptr<ProblemContent> problemContent = extractContentFromJson(jsonResponse, *it);
+    problemFile << problemFileContent;
 
-    std::string templateFile = readTemplateFile();
-
-    std::cout << problemContent->formatTemplate(templateFile) << std::endl;
+    problemFile.close();
 }
 
 nlohmann::json Fetcher::formatQueryJson(const std::string &title)
@@ -226,3 +252,25 @@ std::string Fetcher::readTemplateFile()
 
     return buffer.str();
 }
+
+bool Fetcher::validateExistedProblem(const ProblemContent &problem)
+{
+    std::filesystem::path problemDirectory = "src/problems";
+    std::string defaultFilename = problem.formatFilename();
+
+    if (!std::filesystem::exists(problemDirectory))
+    {
+        throw std::runtime_error("The problem directory is not exitsed.");
+    }
+
+    return std::ranges::any_of(std::filesystem::directory_iterator(problemDirectory),
+                               [&](const std::filesystem::directory_entry &entry)
+                               {
+                                   if (!entry.is_regular_file())
+                                   {
+                                       return false;
+                                   }
+
+                                   return entry.path().filename() == defaultFilename;
+                               });
+}

src/problems/1-two-sum.cpp

@@ -0,0 +1,40 @@
+/**
+* [1] Two Sum
+ */
+#include <bits/stdc++.h>
+#include <gtest/gtest.h>
+using namespace std;
+
+
+// submission codes start here
+
+class Solution
+{
+public:
+    vector<int> twoSum(vector<int> &nums, int target)
+    {
+        unordered_map<int, int> map;
+
+        for (int i = 0; i < nums.size(); ++i)
+        {
+            if (const auto &it = map.find(target - nums[i]); it != map.end())
+            {
+                return {it->second, i};
+            }
+
+            map.insert({nums[i], i});
+        }
+
+        return {};
+    }
+};
+
+// submission codes endo
+
+TEST(P1, Test1)
+{
+    Solution s;
+    vector nums   = {2, 7, 11, 15};
+    vector result = {0, 1};
+    ASSERT_EQ(s.twoSum(nums, 9), result);
+}

src/template.cpp

@@ -1,9 +1,18 @@
 /**
 * [__PROBLEM_ID__] __PROBLEM_TITLE__
  */
+#include <bits/stdc++.h>
+#include <gtest/gtest.h>
+using namespace std;
+
 
 // submission codes start here
 
 __PROBLEM_DEFAULT_CODE__
 
-// submission codes end
+// submission codes endo
+
+TEST(__TEST_CASE_NAME__, Test1)
+{
+
+}