pull = fetch/merge

Calculator/Calculator.pro

@@ -10,6 +10,11 @@ unix {
 LIBS += -L/opt/ptu5/opt/build-ATBTariffCalculator-Desktop_Qt_5_12_12_GCC_64bit-Debug/CalculatorCInterface/ -lCalculatorCInterface
 }
 
+win32 {
+INCLUDEPATH += C:\Users\G.Hoffmann\Downloads\libgit2-1.7.2\libgit2-1.7.2\include
+LIBS += -LC:\build-ATBTariffCalculator-Desktop_Qt_6_5_0_MinGW_64_bit-Release\CalculatorCInterface\release -lCalculatorCInterface
+}
+
 # You can make your code fail to compile if it uses deprecated APIs.
 # In order to do so, uncomment the following line.
 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

Calculator/main.cpp

@@ -26,15 +26,18 @@ int main(int argc, char *argv[])
         //setDebugLevel(LOG_NOTICE);
     }
 
-#ifdef __linux__
+#if 1
 
         //TariffCalculatorHandle handle = NewTariffCalculator();
         //DeleteTariffCalculator(handle);
 
-        if (InitGitLibrary() > 0) {
-            qCritical() << CloneRepository("https://git.mimbach49.de/GerhardHoffmann/customer_999.git", "/tmp/customer_999");
-            ShutdownGitLibrary();
-        }
+        //if (InitGitLibrary() > 0) {
+        //    qCritical() << CloneRepository("https://git.mimbach49.de/GerhardHoffmann/customer_999.git", "C:\\tmp\\customer_999");
+        //    qCritical() << CheckoutLocalBranch("C:\\tmp\\customer_999", "master");
+        //    ShutdownGitLibrary();
+       // }
+
+    qCritical() << GetFileMenuSize("customer_999");
 #else
     QLibrary library("C:\\build-ATBTariffCalculator-Desktop_Qt_6_5_0_MinGW_64_bit-Release\\CalculatorCInterface\\release\\CalculatorCInterface.dll");
     if (library.load()) {

CalculatorCInterface/CalculatorCInterface.pro

@@ -2,12 +2,20 @@ QT+=core
 
 TEMPLATE = lib
 DEFINES += CALCULATOR_C_INTERFACE_LIBRARY
-QMAKE_CXXFLAGS += -fPIC
+
+
+QMAKE_CXXFLAGS += -fPIC -std=c++20
 
 unix {
     LIBS += -L/usr/lib64 -lgit2
 }
 
+win32 {
+    INCLUDEPATH += C:\Users\G.Hoffmann\Downloads\libgit2-1.7.2\libgit2-1.7.2\include
+
+    LIBS += -LC:\Users\G.Hoffmann\Downloads\libgit2-1.7.2\libgit2-1.7.2\build\Debug -lgit2
+}
+
 # INCLUDEPATH+=$$_PRO_FILE_PWD_/../Utilities/
 
 
@@ -20,12 +28,17 @@ CONFIG += c++20 console
 
 SOURCES += \
     calculator_c_interface_lib.cpp \
-    tariff_calculator.cpp
+    git_library.cpp \
+    tariff_calculator.cpp \
+    local_git_repository.cpp
 
 HEADERS += \
     calculator_c_interface_lib.h \
     calculator_c_interface_lib_global.h \
-    tariff_calculator.h
+    git_library.h \
+    tariff_calculator.h \
+    local_git_repository.h \
+    global_defines.h
 
 # Default rules for deployment.
 unix {

CalculatorCInterface/calculator_c_interface_lib.cpp

@@ -1,13 +1,37 @@
 #include "calculator_c_interface_lib.h"
+#include "local_git_repository.h"
+#include "git_library.h"
+
+//#include <git2/common.h>
+
+#include <QMap>
+#include <QString>
+#include <QDir>
+#include <QFile>
+#include <QByteArray>
+#include <QRegularExpression>
+#include <QRegularExpressionMatch>
+#include <mutex>
+
 
 #include <git2.h>
 #include <stdio.h>
+#include <stdint.h>
+#include <algorithm>
 
+//static QMap<QString, git_repository *> customerRepoMap;
+//static std::mutex m;
+
+#ifndef _WIN32
+# include <unistd.h>
+#endif
+#include <errno.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+
 TariffCalculatorHandle NewTariffCalculator(void) {
     return new TariffCalculator();
 }
@@ -16,33 +40,107 @@ void DeleteTariffCalculator(TariffCalculatorHandle handle) {
     delete handle;
 }
 
-int InitGitLibrary(void) {
-    return git_libgit2_init();
+int InitGitLibraryInternal(void) {
+    return GitLibrary::Init();
 }
 
-int ShutdownGitLibrary(void) {
-    return git_libgit2_shutdown();
+int ShutdownGitLibraryInternal(void) {
+    LocalGitRepository::DestroyAllRepositories();
+    return GitLibrary::Shutdown();
 }
 
-int CloneRepository(char const *url, char const *local_path) {
-    git_repository *out;
-    git_clone_options opts;
+int CloneRepositoryInternal(char const *url, char const *local_path) {
+    return GitLibrary::CloneRepository(url, local_path);
+}
 
-    int res = 0;
-    if ((res = git_clone_options_init(&opts, GIT_CLONE_OPTIONS_VERSION)) == 0) {
-        opts.checkout_branch = "master";
+int CheckoutRepositoryInternal(char const *url, char const *localRepoName, char const *branchName) {
+    return GitLibrary::CheckoutRepository(url, localRepoName, branchName);
+}
 
-        fprintf(stderr, "%s:%d %s %s\n", __func__, __LINE__, url, local_path);
+int CommitFileInternal(char const *localRepoName, char const *branchName,
+                       char const *fName, char const *commitMessage) {
+    return GitLibrary::CommitFile(localRepoName, branchName, fName, commitMessage);
+}
 
-        if ((res = git_clone(&out, url, local_path, &opts)) < 0) {
-            git_error const *error = git_error_last();
-            fprintf(stderr, "%s:%d error: %s\n", __func__, __LINE__, error->message);
+int PushRepositoryInternal(char const *localRepoName, char const *branchName,
+                           char const *userName, char const *userPassword) {
+    return GitLibrary::PushRepository(localRepoName, branchName, userName, userPassword);
+}
+
+int PullRepositoryInternal(char const *localRepoName, char const *remoteRepoName) {
+    return GitLibrary::PullRepository(localRepoName, remoteRepoName);
+}
+
+#include <local_git_repository.h>
+
+
+void SetReposRootDirectoryInternal(char const *p) {
+    LocalGitRepository::SetReposRootDirectory(QString::fromUtf8(p));
+}
+
+char const *GetReposRootDirectoryInternal() {
+    return (char const *)LocalGitRepository::GetReposRootDirectory().constData();
+}
+
+char const *GetLocalRepositoryPathInternal(char const *localGitRepo) {
+    return (char const *)LocalGitRepository::GetInstance(localGitRepo)->localRepositoryPath().constData();
+}
+
+int32_t GetFileMenuSizeInternal(char const *localGitRepo) {
+    return LocalGitRepository::GetInstance(localGitRepo)->GetFileMenuSizeInternal();
+}
+
+char const *GetFileMenuInternal(const char *localGitRepo) {
+    QByteArray const &a = LocalGitRepository::GetInstance(localGitRepo)->GetFileMenuInternal().constData();
+    if (a.isValidUtf8()) {
+        int const len = GetFileMenuSizeInternal(localGitRepo);
+        if (len > 0) {
+            char *json = new char [len+1];
+            // fprintf(stderr, "allocate pointer %p\n", json);
+            memset(json, 0x00, len+1);
+            memcpy(json, a.constData(), std::min(len, (int)a.size()));
+            return json;
         }
-    } else {
-        git_error const *error = git_error_last();
-        fprintf(stderr, "%s:%d error: %s\n", __func__, __LINE__, error->message);
     }
-    return res;
+    return nullptr;
+}
+
+
+char const *GetFileNameInternal(char const *localGitRepo, char const *fileId) {
+    QByteArray const &a = LocalGitRepository::GetInstance(localGitRepo)->GetFileNameInternal(fileId);
+    if (a.isValidUtf8()) {
+        char *c = new char[a.size() + 1];
+        memset(c, 0x00, a.size() + 1);
+        memcpy(c, a.constData(), a.size());
+        return c;
+    }
+    return nullptr;
+}
+
+int32_t GetFileSize(char const *localGitRepo, char const *fileId) {
+    return LocalGitRepository::GetInstance(localGitRepo)->GetFileSize(fileId);
+}
+
+char const *GetFileInternal(char const *localGitRepo, char const *fileId) {
+    QByteArray const &a = LocalGitRepository::GetInstance(localGitRepo)->GetFileInternal(fileId);
+    if (a.isValidUtf8()) {
+        char *c = new char[a.size() + 1];
+        memset(c, 0x00, a.size() + 1);
+        memcpy(c, a.constData(), a.size());
+        return c;
+    }
+    return nullptr;
+}
+
+bool SetFileInternal(char const *localGitRepo, char const *fileId, char const *json, int size) {
+    return LocalGitRepository::GetInstance(localGitRepo)->SetFileInternal(QString(fileId), QByteArray(json, size));
+}
+
+void DeleteMem(char *p) {
+    if (p) {
+        // fprintf(stderr, "delete pointer %p\n", p);
+        delete p;
+    }
 }
 
 #ifdef __cplusplus

CalculatorCInterface/calculator_c_interface_lib.h

@@ -1,6 +1,5 @@
 #ifndef CALCULATOR_C_INTERFACE_LIB_H_INCLUDED
 #define CALCULATOR_C_INTERFACE_LIB_H_INCLUDED
-
 #include "calculator_c_interface_lib_global.h"
 #include "tariff_calculator.h"
 
@@ -10,16 +9,31 @@ typedef TariffCalculator *TariffCalculatorHandle;
 extern "C" {
 #endif
 
+void DeleteMem(char *p) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+void SetReposRootDirectoryInternal(char const *p) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+char const *GetReposRootDirectoryInternal() CALCULATOR_C_INTERFACE_LIB_EXPORT;
+char const *GetLocalRepositoryPathInternal(char const *localRepo) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+
+// interface for menu of webpage
+char const *GetFileMenuInternal(char const *localRepo) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int32_t GetFileMenuSizeInternal(char const *localRepo) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+
+char const *GetFileNameInternal(char const *localRepo, char const *fileId) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int32_t GetFileSize(char const *localRepo, char const *fileId) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+char const *GetFileInternal(char const *localRepo, char const *fileId) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+bool SetFileInternal(char const *localRepo, char const *fileId, char const *json, int size) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+
 TariffCalculatorHandle NewTariffCalculator(void) CALCULATOR_C_INTERFACE_LIB_EXPORT;
 void DeleteTariffCalculator(TariffCalculatorHandle handle) CALCULATOR_C_INTERFACE_LIB_EXPORT;
 
-int InitGitLibrary(void) CALCULATOR_C_INTERFACE_LIB_EXPORT;
-int ShutdownGitLibrary(void) CALCULATOR_C_INTERFACE_LIB_EXPORT;
-
-int CloneRepository(char const *url, char const *local_path) CALCULATOR_C_INTERFACE_LIB_EXPORT;
-
-
-void DeleteTariffCalculator(TariffCalculatorHandle handle) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+// libgit2
+int InitGitLibraryInternal(void) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int ShutdownGitLibraryInternal(void) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int CloneRepositoryInternal(char const *url, char const *local_path) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int CheckoutRepositoryInternal(char const *url, char const *localRepoName, char const *branchName) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int CommitFileInternal(char const *local_path, char const *branch_name, char const *file_name, char const *commit_message) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int PushRepositoryInternal(char const *local_path, char const *branch_name, char const *user, char const *password) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int PullRepositoryInternal(char const *localRepoName, char const *remoteRepoName) CALCULATOR_C_INTERFACE_LIB_EXPORT;
 
 #ifdef __cplusplus
 }

CalculatorCInterface/git_library.h

@@ -0,0 +1,47 @@
+#ifndef GIT_LIBRARY_H_INCLUDED
+#define GIT_LIBRARY_H_INCLUDED
+
+#include <QByteArray>
+#include <QString>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QDir>
+#include <git2.h>
+
+class CWD {
+    QDir m_prev;
+    QDir m_localRepoDir;
+    QDir m_localRepoGitDir;
+    bool m_valid;
+public:
+    CWD(QString const &localRepoName);
+    ~CWD();
+
+    QDir const &localRepoDir() const { return m_localRepoDir; }
+    QDir &localRepoDir() { return m_localRepoDir; }
+    QDir const &localRepoGitDir() const { return m_localRepoGitDir; }
+    QDir &localRepoGitDir() { return m_localRepoGitDir; }
+};
+
+class GitLibrary {
+    static QString m_userName;
+    static QString m_userPassword;
+public:
+    static QString &userName() { return m_userName; }
+    static QString &userPassword() { return m_userPassword; }
+
+    static int Init();
+    static int Shutdown();
+    static int CloneRepository(char const *url, char const *localRepoName);
+    static int CheckoutRepository(char const *url, char const *localRepoName, char const *branchName);
+    static int CommitRepository(char const *localRepoName, char const *branchName, char const *commitMessage);
+    static int CommitFile(char const *localRepoName, char const *branchName, char const *fName, char const *commitMessage);
+    static int PushRepository(char const *localRepoName, char const *branchName, char const *userName, char const *userPassword);
+    static int PullRepository(char const *localRepoName, char const *remoteRepoName);
+
+    // explicit GitLibrary();
+    // ~GitLibrary();
+};
+
+#endif // #define GIT_LIBRARY_H_INCLUDED

CalculatorCInterface/global_defines.h

@@ -0,0 +1,7 @@
+#ifndef GLOBAL_DEFINES_H_INCLUDED
+#define GLOBAL_DEFINES_H_INCLUDED
+
+#define HEADER __func__ << "(" << __LINE__ << ")"
+
+#endif // GLOBAL_DEFINES_H_INCLUDED
+

CalculatorCInterface/local_git_repository.cpp

@@ -0,0 +1,212 @@
+#include "local_git_repository.h"
+#include "git_library.h"
+
+#include <QDebug>
+#include <QDir>
+#include <QFile>
+#include <QTextStream>
+#include <QJsonDocument>
+#include <QByteArray>
+#include <QRegularExpression>
+#include <QRegularExpressionMatch>
+#include <QFile>
+
+
+QString LocalGitRepository::repoRootDirectory = "";
+QMap<QString, LocalGitRepository *> LocalGitRepository::localGitRepos;
+
+QMap<QString, LocalGitRepository *> &LocalGitRepository::GetLocalGitRepos() {
+    return localGitRepos;
+}
+
+void LocalGitRepository::SetReposRootDirectory(QString s) {
+    if (repoRootDirectory.isEmpty()) {
+        repoRootDirectory = s;
+        return;
+    }
+    qCritical() << __func__ << ":" << __LINE__
+                << "ERROR git-repository-root-directory already set"
+                << repoRootDirectory;
+}
+
+QString LocalGitRepository::GetReposRootDirectory() {
+    return repoRootDirectory;
+}
+
+LocalGitRepository::LocalGitRepository(QString const &localRepository)
+    : m_localRepository(localRepository)
+    , m_fileMenu("{}")
+    , m_fileMenuSize(-1)
+    , m_git_repository(nullptr) {
+}
+
+LocalGitRepository::~LocalGitRepository() {
+}
+
+void LocalGitRepository::SetGitRepository(git_repository *git_repo) {
+    m_git_repository = git_repo;
+}
+
+git_repository const *LocalGitRepository::GetGitRepository() const {
+    return m_git_repository;
+}
+
+git_repository *LocalGitRepository::GetGitRepository() {
+    return m_git_repository;
+}
+
+QString LocalGitRepository::localRepositoryName() const { // e.g. customer_999
+    return m_localRepository;
+}
+
+QString LocalGitRepository::localRepositoryPath() const {
+    if (!repoRootDirectory.isEmpty()) {
+        return QDir::cleanPath(repoRootDirectory + QDir::separator() + m_localRepository);
+    }
+    qCritical() << __func__ << ":" << __LINE__
+                << "ERROR git-repository-root-directory not set";
+    return "";
+}
+
+QString LocalGitRepository::localRepositoryPath(QString const &localRepository) {
+    if (!repoRootDirectory.isEmpty()) {
+        return QDir::cleanPath(repoRootDirectory + QDir::separator() + localRepository);
+    }
+    qCritical() << __func__ << ":" << __LINE__
+                << "ERROR git-repository-root-directory not set";
+    return "";
+}
+
+LocalGitRepository *LocalGitRepository::GetInstance(QString const& localRepository) {
+    LocalGitRepository *repo = nullptr;
+    if (GetLocalGitRepos().count(localRepository) > 0) {
+        repo = GetLocalGitRepos()[localRepository];
+    } else {
+        repo = new LocalGitRepository(localRepository);
+        qCritical() << "created local git-repository" << localRepository;
+        GetLocalGitRepos().insert(localRepository, repo);
+    }
+    if (repo == nullptr) {
+        qCritical() << __func__ << ":" << __LINE__
+                    << "ERROR: could not find local git-repository" << localRepository;
+    }
+    return repo;
+}
+
+bool LocalGitRepository::DestroyInstance(QString const &localRepository) {
+    if (GetLocalGitRepos().count(localRepository) > 0) {
+        LocalGitRepository *repo = GetLocalGitRepos().take(localRepository);
+        delete repo;
+        qCritical() << "deleted local git-repository" << localRepository;
+        return true;
+    }
+    qCritical() << __func__ << ":" << __LINE__
+                << "ERROR: could not find local git-repository" << localRepository;
+    return false;
+}
+
+void LocalGitRepository::DestroyAllRepositories() {
+    for (auto it = GetLocalGitRepos().keyValueBegin(); it != GetLocalGitRepos().keyValueEnd(); ++it) {
+        QString const &key = it->first;
+        LocalGitRepository *repo = GetLocalGitRepos()[key];
+        delete repo;
+        qCritical() << "deleted local git-repository" << key;
+    }
+    GetLocalGitRepos().clear();
+}
+
+int32_t LocalGitRepository::GetFileMenuSizeInternal() const {
+    return m_fileMenuSize;
+}
+
+QByteArray LocalGitRepository::GetFileMenuInternal() {
+    if (m_fileMenuSize == -1) {
+        QFile f(QDir::cleanPath(repoRootDirectory + QDir::separator()
+                              + m_localRepository + QDir::separator()
+                              + "etc/psa_webinterface/menu_config.json"));
+        if (f.exists()) {
+            if (f.open(QIODevice::ReadOnly | QIODevice::Text)) {
+                m_fileMenu = QTextStream(&f).readAll().toUtf8();
+
+                if (m_fileMenu.isValidUtf8()) {
+                    QString const &s = QString::fromUtf8(m_fileMenu);
+                    m_fileMenuSize = s.toLocal8Bit().size();
+                }
+            }
+        }
+    }
+    return m_fileMenu;
+}
+
+QByteArray LocalGitRepository::GetFileNameInternal(QString const &fId) {
+    QRegularExpressionMatch match;
+    static const QRegularExpression re("(master|[0-9]+)");
+    if (fId.lastIndexOf(re, -1, &match) != -1) {
+        int idx = fId.indexOf("/");
+        if (idx != -1) {
+            QString path = fId.mid(idx);
+            idx = path.indexOf(":");
+            if (idx != -1) {
+                path = path.mid(0, idx);
+                QString s = match.captured(match.lastCapturedIndex());
+                if (s != "master") {
+                    if (fId.contains("psa_tariff")) {
+                        QString fn(QDir::cleanPath(
+                            repoRootDirectory + QDir::separator() +
+                            QString(m_localRepository) + QDir::separator()
+                            + path + QDir::separator()
+                            + QString("tariff%1.json").arg(s.toUInt(), 2, 10, QChar('0'))));
+                        return fn.toUtf8();
+                    }
+                }
+            }
+        }
+    }
+    return QByteArray();
+}
+
+QByteArray LocalGitRepository::GetFileInternal(QString const &fId) {
+    QByteArray a = GetFileNameInternal(fId);
+    if (a.isValidUtf8()) {
+        QFile fn(a);
+        if (fn.exists()) {
+            if (fn.open(QIODevice::ReadOnly)) {
+                return fn.readAll();
+            }
+        }
+    }
+
+    return QByteArray("{}");
+}
+
+int32_t LocalGitRepository::GetFileSize(QString const &fId) {
+    QByteArray a = GetFileNameInternal(fId);
+    if (a.isValidUtf8()) {
+        QFile fn(a);
+        if (fn.exists()) {
+            return fn.size();
+        }
+    }
+    return -1;
+}
+
+bool LocalGitRepository::SetFileInternal(QString const &fId, QByteArray const &json) {
+    QByteArray a = GetFileNameInternal(fId);
+    if (a.isValidUtf8()) {
+        QFile fn(a);
+        if (fn.exists()) {
+            if (fn.open(QIODevice::WriteOnly)) {
+                qint64 bytesWritten = 0;
+                qint64 bytesToWrite = json.size();
+                while (bytesToWrite > 0 &&
+                      (bytesWritten = fn.write(json.constData(), bytesToWrite)) != -1) {
+                    bytesToWrite -= bytesWritten;
+                }
+                fn.flush();
+                return (bytesToWrite == 0);
+            }
+        }
+
+    }
+    return false;
+}

CalculatorCInterface/local_git_repository.h

@@ -0,0 +1,58 @@
+#ifndef LOCAL_GIT_REPOSITORY_H_INCLUDED
+#define LOCAL_GIT_REPOSITORY_H_INCLUDED
+
+#include <QByteArray>
+#include <QString>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QDir>
+#include <QMap>
+
+#include <git2.h>
+
+class GitLibrary;
+class LocalGitRepository {
+    friend class GitLibrary;
+    QString m_localRepository;
+    mutable QByteArray m_fileMenu;
+    mutable int32_t m_fileMenuSize;
+    git_repository *m_git_repository;
+
+    static QString repoRootDirectory;
+    static QMap<QString, LocalGitRepository *> localGitRepos;
+
+protected: // force heap-based objects
+    LocalGitRepository(QString const &localRepository);
+    ~LocalGitRepository();
+
+public:
+    static void SetReposRootDirectory(QString s);
+    static QString GetReposRootDirectory();
+
+    static LocalGitRepository *GetInstance(QString const &localRepository);
+    static bool DestroyInstance(QString const &localRepository);
+    static void DestroyAllRepositories();
+
+    static QMap<QString, LocalGitRepository *> &GetLocalGitRepos();
+
+    QString localRepositoryName() const;
+    QString localRepositoryPath() const;
+
+    void SetGitRepository(git_repository *git_repo);
+    git_repository const *GetGitRepository() const;
+    git_repository *GetGitRepository();
+
+    static QString localRepositoryPath(QString const &localRepository);
+
+    QByteArray GetFileMenuInternal();
+    int32_t GetFileMenuSizeInternal() const;
+
+    QByteArray GetFileNameInternal(QString const &fileId);
+    int32_t GetFileSize(QString const &fileId);
+    QByteArray GetFileInternal(QString const &fileId);
+
+    bool SetFileInternal(QString const &fileId, QByteArray const &json);
+};
+
+#endif // LOCAL_GIT_REPOSITORY_H_INCLUDED

windows/helloworld.lpr

@@ -0,0 +1,35 @@
+
+
+{%RunFlags MESSAGES+}
+{$mode ObjFPC}{$H-}
+program helloworld(output);
+
+
+uses
+    TariffCalculator, CTypes;
+
+var
+   TariffCalc:  TariffCalculatorHandle;
+   CustomerRepo: array[0..100] of char;
+   LocalCustomerRepo: array[0..100] of char;
+
+begin
+writeLn('Hello, World!') ;
+// TariffCalc := NewTariffCalculator;
+// DeleteTariffCalculator(TariffCalc);
+   if InitGitLibrary() > 0 then
+        begin
+        writeLn('init OK!') ;
+        CustomerRepo := 'https://git.mimbach49.de/GerhardHoffmann/customer_999.git';
+        LocalCustomerRepo := 'C:\\tmp\\customer_999';
+        CloneRepository(CustomerRepo, LocalCustomerRepo);
+
+        ShutdownGitLibrary();
+        end
+   else
+       begin
+       writeLn('init NOT OK!') ;
+       Readln;
+       end;
+end.
+

windows/tariffcalculator.pas

@@ -0,0 +1,35 @@
+unit TariffCalculator;
+
+{$mode ObjFPC}{$H-}
+
+interface
+
+uses
+  SysUtils, CTypes;
+
+type
+  // Can't use the class directly, so it is treated as an opaque handle.
+  // THandle is guaranteed to have the right size, even on other platforms.
+  TariffCalculatorHandle = THandle;
+
+function NewTariffCalculator: TariffCalculatorHandle; stdcall;
+procedure DeleteTariffCalculator(handle: TariffCalculatorHandle); stdcall;
+
+function InitGitLibrary: cint32; stdcall;
+function ShutdownGitLibrary: cint32; stdcall;
+function CloneRepository(var url; var local_path) : cint32; stdcall;
+
+implementation
+
+const
+  DLLName = 'CalculatorCInterface.dll';
+
+function NewTariffCalculator: TariffCalculatorHandle; stdcall; external DLLName;
+procedure DeleteTariffCalculator(handle: TariffCalculatorHandle); stdcall; external DLLName;
+
+function InitGitLibrary: cint32; stdcall; external DLLName;
+function ShutdownGitLibrary: cint32; stdcall; external DLLName;
+function CloneRepository(var url; var local_path) : cint32; stdcall; external DLLName;
+
+end.
+