feat(git): integrate Git Credential Manager

src/managers/git_manager.cpp

@@ -434,6 +434,57 @@ bool GitManager::captureGit(RepositoryView& repository, const std::vector<std::s
     return true;
 }
 
+bool GitManager::prepareCredentials(RepositoryView& repository, std::string& error) {
+    if (repository.credentials_checked) return true;
+
+    bool uses_https = false;
+    for (const std::string& remote_name : repository.remotes) {
+        git_remote* remote = nullptr;
+        if (git_remote_lookup(&remote, repository.repo, remote_name.c_str()) == 0) {
+            const char* url = git_remote_url(remote);
+            const std::string remote_url = url ? url : "";
+            uses_https = uses_https || remote_url.starts_with("https://") || remote_url.starts_with("http://");
+            git_remote_free(remote);
+        }
+    }
+    if (!uses_https) {
+        repository.credentials_checked = true;
+        return true;
+    }
+
+    std::string helper;
+    std::string helper_error;
+    const bool has_helper = captureGit(repository, {"config", "--get-all", "credential.helper"},
+        helper, helper_error) && !helper.empty();
+
+    std::string gcm_version;
+    std::string gcm_error;
+    const bool gcm_available = captureGit(repository, {"credential-manager", "--version"},
+        gcm_version, gcm_error);
+
+    if (has_helper) {
+        if (helper.find("manager") != std::string::npos && !gcm_available) {
+            error = "Git Credential Manager is configured but unavailable. Reinstall Git for Windows with GCM enabled.";
+            return false;
+        }
+        repository.credentials_checked = true;
+        return true;
+    }
+
+    if (!gcm_available) {
+        error = "This HTTPS remote needs authentication, but no credential helper is configured. "
+            "Install Git Credential Manager or configure credential.helper in Git.";
+        return false;
+    }
+
+    std::string configure_output;
+    if (!captureGit(repository, {"config", "--local", "credential.helper", "manager"},
+            configure_output, error))
+        return false;
+    repository.credentials_checked = true;
+    return true;
+}
+
 bool GitManager::applyPatch(RepositoryView& repository, const std::string& patch, bool cached,
         bool reverse, std::string& error) {
     const std::filesystem::path patch_path = std::filesystem::temp_directory_path() /
@@ -455,6 +506,7 @@ bool GitManager::applyPatch(RepositoryView& repository, const std::string& patch
 }
 
 bool GitManager::fetch(RepositoryView& repository, const std::string& remote, std::string& error) {
+    if (!prepareCredentials(repository, error)) return false;
     const std::vector<std::string> args = remote.empty()
         ? std::vector<std::string>{"fetch", "--all", "--prune"}
         : std::vector<std::string>{"fetch", remote, "--prune"};
@@ -462,6 +514,7 @@ bool GitManager::fetch(RepositoryView& repository, const std::string& remote, st
 }
 
 bool GitManager::pull(RepositoryView& repository, int mode, std::string& error) {
+    if (!prepareCredentials(repository, error)) return false;
     if (mode == 0) return fetch(repository, {}, error);
     std::vector<std::string> args{"pull"};
     if (mode == 1) args.push_back("--ff");
@@ -471,6 +524,7 @@ bool GitManager::pull(RepositoryView& repository, int mode, std::string& error)
 }
 
 bool GitManager::push(RepositoryView& repository, std::string& error) {
+    if (!prepareCredentials(repository, error)) return false;
     if (runGit(repository, {"push"}, "Push complete", error)) return true;
     if (repository.remotes.empty()) return false;
     const std::string remote = std::find(repository.remotes.begin(), repository.remotes.end(), "origin") !=
@@ -546,6 +600,7 @@ bool GitManager::createTag(RepositoryView& repository, const std::string& name,
 
 bool GitManager::addRemote(RepositoryView& repository, const std::string& name,
         const std::string& url, std::string& error) {
+    repository.credentials_checked = false;
     return runGit(repository, {"remote", "add", name, url}, "Remote added", error);
 }
 

src/managers/git_manager.h

@@ -54,6 +54,7 @@ private:
     void computeGraphLanes(RepositoryView& repository);
     bool loadRepositoryData(RepositoryView& repository, std::string& error);
     void loadWorkingTree(RepositoryView& repository);
+    bool prepareCredentials(RepositoryView& repository, std::string& error);
     bool runGit(RepositoryView& repository, const std::vector<std::string>& arguments,
         const char* success_message, std::string& message, bool reload = true);
 };

src/models/repository.h

@@ -47,6 +47,7 @@ struct RepositoryView {
     git_repository* repo = nullptr;
     git_revwalk* commit_walk = nullptr;
     bool history_exhausted = false;
+    bool credentials_checked = false;
     std::string path;
     std::string name = "New Tab";
     std::string branch = "detached";
@@ -70,5 +71,6 @@ struct RepositoryView {
         commit_walk = nullptr;
         if (repo) git_repository_free(repo);
         repo = nullptr;
+        credentials_checked = false;
     }
 };