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// Copyright (c) 2026 Progmasoft.
// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-2.0
#include "Git.hpp"
#include "Process.hpp"
#include <algorithm>
#include <cctype>
#include <system_error>
namespace Progmasoft::Catch3::Runner
{
namespace
{
Expected<std::string>
Git(const std::filesystem::path &directory,
std::vector<std::string> arguments)
{
ChildOptions options;
options.arguments.emplace_back("git");
options.arguments.insert(
options.arguments.end(), arguments.begin(), arguments.end());
options.workingDirectory = directory;
options.searchPath = true;
auto run = RunAndCapture(options);
if (!run)
{
return run.GetError();
}
if (!run->status.Succeeded())
{
std::string message = run->errors;
while (!message.empty() &&
(message.back() == '\n' || message.back() == '\r'))
{
message.pop_back();
}
return Error{"git " + arguments.front() + " failed: " +
message};
}
return run->output;
}
std::vector<std::string>
Lines(const std::string &text)
{
std::vector<std::string> lines;
std::size_t start = 0;
while (start < text.size())
{
auto end = text.find('\n', start);
if (end == std::string::npos)
{
end = text.size();
}
std::string line = text.substr(start, end - start);
if (!line.empty() && line.back() == '\r')
{
line.pop_back();
}
if (!line.empty())
{
lines.push_back(std::move(line));
}
start = end + 1;
}
return lines;
}
std::string
Normalised(const std::filesystem::path &path)
{
std::string text = path.lexically_normal().generic_string();
#if defined(_WIN32)
// Windows paths compare without case.
std::transform(text.begin(), text.end(), text.begin(), [](char c) {
return static_cast<char>(
std::tolower(static_cast<unsigned char>(c)));
});
#endif
return text;
}
} // namespace
Expected<Changes>
ReadChanges(const std::filesystem::path &directory,
const std::string &revision)
{
auto root = Git(directory, {"rev-parse", "--show-toplevel"});
if (!root)
{
return root.GetError();
}
Changes changes;
const auto rootLines = Lines(*root);
if (rootLines.empty())
{
return Error{"git did not name the top of the checkout"};
}
changes.root = std::filesystem::path{rootLines.front()};
changes.commit = CurrentCommit(directory);
const std::string base = revision.empty() ? "HEAD" : revision;
auto changed =
Git(changes.root, {"diff", "--name-only", "--no-renames", base});
if (!changed)
{
return changed.GetError();
}
auto untracked = Git(changes.root,
{"ls-files", "--others", "--exclude-standard"});
for (const auto &line : Lines(*changed))
{
changes.files.push_back(changes.root / line);
}
if (untracked)
{
for (const auto &line : Lines(*untracked))
{
changes.files.push_back(changes.root / line);
}
}
return changes;
}
std::string
CurrentCommit(const std::filesystem::path &directory)
{
auto commit = Git(directory, {"rev-parse", "HEAD"});
if (!commit)
{
return {};
}
const auto lines = Lines(*commit);
return lines.empty() ? std::string{} : lines.front();
}
bool
SameSourceFile(const std::filesystem::path &left,
const std::filesystem::path &right)
{
const std::string first = Normalised(left);
const std::string second = Normalised(right);
if (first == second)
{
return true;
}
const auto endsWith = [](const std::string &text,
const std::string &suffix) {
if (suffix.empty() || suffix.size() >= text.size())
{
return false;
}
return text.compare(text.size() - suffix.size(),
suffix.size(),
suffix) == 0 &&
text[text.size() - suffix.size() - 1] == '/';
};
// __FILE__ is often relative to the build directory.
std::string relativeFirst = first;
std::string relativeSecond = second;
while (relativeFirst.rfind("../", 0) == 0)
{
relativeFirst.erase(0, 3);
}
while (relativeSecond.rfind("../", 0) == 0)
{
relativeSecond.erase(0, 3);
}
return (!left.is_absolute() && endsWith(second, relativeFirst)) ||
(!right.is_absolute() && endsWith(first, relativeSecond));
}
} // namespace Progmasoft::Catch3::Runner
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