Add tracking info for log subcommand (#106)

* Add tracking info

* address review comments

* address review comments

Author: SandrineP

src/subcommand/log_subcommand.cpp

@@ -1,8 +1,11 @@
 #include <format>
 #include <git2.h>
-#include <git2/revwalk.h>
+#include <git2/oid.h>
+#include <git2/refs.h>
 #include <git2/types.h>
+#include <sstream>
 #include <string_view>
+#include <vector>
 
 #include <termcolor/termcolor.hpp>
 
@@ -50,15 +53,180 @@ void print_time(git_time intime, std::string prefix)
 	std::cout << prefix << out << " " << sign << std::format("{:02d}", hours) << std::format("{:02d}", minutes) <<std::endl;
 }
 
-void print_commit(const commit_wrapper& commit, std::string m_format_flag)
+std::vector<std::string> get_tags_for_commit(repository_wrapper& repo, const git_oid& commit_oid)
+{
+    std::vector<std::string> tags;
+    git_strarray tag_names = {0};
+
+    if (git_tag_list(&tag_names, repo) != 0)
+    {
+        return tags;
+    }
+
+    for (size_t i = 0; i < tag_names.count; i++)
+    {
+        std::string tag_name = tag_names.strings[i];
+        std::string ref_name = "refs/tags/" + std::string(tag_name);
+
+        reference_wrapper tag_ref = repo.find_reference(ref_name);
+        object_wrapper peeled = tag_ref.peel<object_wrapper>();
+
+        if (git_oid_equal(&peeled.oid(), &commit_oid))
+        {
+            tags.push_back(std::string(tag_name));
+        }
+    }
+
+    git_strarray_dispose(&tag_names);   // TODO: refactor git_strarray_wrapper to use it here
+    return tags;
+}
+
+std::vector<std::string> get_branches_for_commit(repository_wrapper& repo, git_branch_t type, const git_oid& commit_oid, const std::string exclude_branch)
+{
+    std::vector<std::string> branches;
+
+    auto branch_iter = repo.iterate_branches(type);
+    while (auto branch = branch_iter.next())
+    {
+        const git_oid* branch_target = nullptr;
+        git_reference* ref = branch.value();
+
+        if (git_reference_type(ref) == GIT_REFERENCE_DIRECT)
+        {
+            branch_target = git_reference_target(ref);
+        }
+        else if (git_reference_type(ref) == GIT_REFERENCE_SYMBOLIC)
+        {
+            git_reference* resolved = nullptr;
+            if (git_reference_resolve(&resolved, ref) == 0)
+            {
+                branch_target = git_reference_target(resolved);
+                git_reference_free(resolved);
+            }
+        }
+
+        if (branch_target && git_oid_equal(branch_target, &commit_oid))
+        {
+            std::string branch_name(branch->name());
+            if (type == GIT_BRANCH_LOCAL)
+            {
+                if (branch_name != exclude_branch)
+                {
+                    branches.push_back(branch_name);
+                }
+            }
+            else
+            {
+                branches.push_back(branch_name);
+            }
+        }
+    }
+
+    return branches;
+}
+
+struct commit_refs
+{
+    std::string head_branch;
+    std::vector<std::string> tags;
+    std::vector<std::string> local_branches;
+    std::vector<std::string> remote_branches;
+
+    bool has_refs() const {
+        return !head_branch.empty() || !tags.empty() ||
+               !local_branches.empty() || !remote_branches.empty();
+    }
+};
+
+commit_refs get_refs_for_commit(repository_wrapper& repo, const git_oid& commit_oid)
+{
+    commit_refs refs;
+
+    if (!repo.is_head_unborn())
+    {
+        auto head = repo.head();
+        auto head_taget = head.target();
+        if (git_oid_equal(head_taget, &commit_oid))
+        {
+            refs.head_branch = head.short_name();
+        }
+    }
+
+    refs.tags = get_tags_for_commit(repo, commit_oid);
+    refs.local_branches = get_branches_for_commit(repo, GIT_BRANCH_LOCAL, commit_oid, refs.head_branch);
+    refs.remote_branches = get_branches_for_commit(repo, GIT_BRANCH_REMOTE, commit_oid, "");
+
+    return refs;
+}
+
+void print_refs(const commit_refs& refs)
+{
+    if (!refs.has_refs())
+    {
+        return;
+    }
+
+    std::cout << " (";
+
+    bool first = true;
+
+    if (!refs.head_branch.empty())
+    {
+        std::cout << termcolor::bold << termcolor::cyan << "HEAD" << termcolor::reset
+                  << termcolor::yellow << " -> " << termcolor::reset
+                  << termcolor::bold << termcolor::green << refs.head_branch << termcolor::reset
+                  << termcolor::yellow;
+        first = false;
+    }
+
+    for (const auto& tag :refs.tags)
+    {
+        if (!first)
+        {
+            std::cout << ", ";
+        }
+        std::cout << termcolor::bold << "tag: " << tag << termcolor::reset << termcolor::yellow;
+        first = false;
+    }
+
+    for (const auto& remote : refs.remote_branches)
+    {
+        if (!first)
+        {
+            std::cout << ", ";
+        }
+        std::cout << termcolor::bold << termcolor::red << remote << termcolor::reset << termcolor::yellow;
+        first = false;
+    }
+
+    for (const auto& local : refs.local_branches)
+    {
+        if (!first)
+        {
+            std::cout << ", ";
+        }
+        std::cout << termcolor::bold << termcolor::green << local << termcolor::reset << termcolor::yellow;
+        first = false;
+    }
+
+    std::cout << ")" << termcolor::reset;
+}
+
+void print_commit(repository_wrapper& repo, const commit_wrapper& commit, std::string m_format_flag)
 {
     std::string buf = commit.commit_oid_tostr();
 
     signature_wrapper author = signature_wrapper::get_commit_author(commit);
     signature_wrapper committer = signature_wrapper::get_commit_committer(commit);
 
     stream_colour_fn colour = termcolor::yellow;
-    std::cout << colour << "commit " << buf << termcolor::reset << std::endl;
+    std::cout << colour << "commit " << buf;
+
+    commit_refs refs = get_refs_for_commit(repo, commit.oid());
+    print_refs(refs);
+
+    std::cout << termcolor::reset << std::endl;
+
     if (m_format_flag=="fuller")
     {
         std::cout << "Author:\t    " <<  author.name() << " " << author.email() << std::endl;
@@ -78,7 +246,19 @@ void print_commit(const commit_wrapper& commit, std::string m_format_flag)
             print_time(author.when(), "Date:\t");
         }
     }
-    std::cout << "\n    " << commit.message() << "\n" << std::endl;
+
+    std::string message = commit.message();
+    while (!message.empty() && message.back() == '\n')
+    {
+        message.pop_back();
+    }
+    std::istringstream message_stream(message);
+    std::string line;
+    while (std::getline(message_stream, line))
+    {
+        std::cout << "\n    " << line;
+    }
+    std::cout << std::endl;
 }
 
 void log_subcommand::run()
@@ -102,8 +282,12 @@ void log_subcommand::run()
     git_oid commit_oid;
     while (!walker.next(commit_oid) && i<m_max_count_flag)
     {
+        if (i != 0)
+        {
+            std::cout << std::endl;
+        }
         commit_wrapper commit = repo.find_commit(commit_oid);
-        print_commit(commit, m_format_flag);
+        print_commit(repo, commit, m_format_flag);
         ++i;
     }