cli/src/util/Fs.cpp at main · vixcpp/cli · GitHub

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/**

* @file Fs.cpp

* @author Gaspard Kirira

* https://github.com/vixcpp/vix

* Use of this source code is governed by a MIT license

* that can be found in the License file.

* Vix.cpp

#include <vix/cli/util/Fs.hpp>

#include <vix/utils/Env.hpp>

#include <cstdlib>

#include <fstream>

#include <iostream>

#include <sstream>

#include <system_error>

#ifdef _WIN32

#include <windows.h>

#else

#include <fcntl.h>

#include <sys/stat.h>

#include <unistd.h>

#endif

namespace vix::cli::util

{

bool file_exists(const fs::path &p)

{

std::error_code ec{};

return fs::exists(p, ec) && !ec;

}

bool dir_exists(const fs::path &p)

{

std::error_code ec{};

return fs::exists(p, ec) && fs::is_directory(p, ec) && !ec;

}

bool ensure_dir(const fs::path &p, std::string &err)

{

if (dir_exists(p))

return true;

std::error_code ec{};

fs::create_directories(p, ec);

if (ec)

{

err = ec.message();

return false;

}

return true;

}

std::string read_text_file_or_empty(const fs::path &p)

{

std::ifstream ifs(p, std::ios::binary);

if (!ifs)

return {};

std::ostringstream oss;

oss << ifs.rdbuf();

return oss.str();

}

bool write_text_file_atomic(const fs::path &p, const std::string &content)

{

std::error_code ec{};

if (!p.parent_path().empty())

fs::create_directories(p.parent_path(), ec);

const fs::path tmp = p.string() + ".tmp";

{

std::ofstream ofs(tmp, std::ios::binary);

if (!ofs)

return false;

ofs.write(content.data(), static_cast<std::streamsize>(content.size()));

ofs.flush();

if (!ofs)

return false;

}

fs::rename(tmp, p, ec);

if (ec)

{

fs::remove(tmp, ec);

return false;

}

return true;

}

std::optional<fs::path> find_project_root(fs::path start)

{

std::error_code ec{};

start = fs::weakly_canonical(start, ec);

if (ec)

return std::nullopt;

for (fs::path p = start; !p.empty(); p = p.parent_path())

{

if (file_exists(p / "CMakeLists.txt"))

return p;

if (p == p.root_path())

break;

}

return std::nullopt;

}

void collect_files_recursive(

const fs::path &root,

const std::string &ext,

std::vector<fs::path> &out)

{

std::error_code ec{};

if (!dir_exists(root))

return;

for (auto it = fs::recursive_directory_iterator(root, ec);

it != fs::recursive_directory_iterator(); it.increment(ec))

{

if (ec)

break;

if (!it->is_regular_file(ec))

continue;

const fs::path p = it->path();

if (ext.empty() || p.extension() == ext)

out.push_back(p);

}

void print_log_tail_fast(const fs::path &logPath, std::size_t maxLines)

{

std::ifstream ifs(logPath, std::ios::binary);

if (!ifs)

return;

ifs.seekg(0, std::ios::end);

const std::streamoff size = ifs.tellg();

if (size <= 0)

return;

const std::streamoff chunkSize = 64 * 1024; // 64 KB

std::string buffer;

buffer.reserve(static_cast<std::size_t>(std::min<std::streamoff>(size, chunkSize)));

std::streamoff pos = size;

std::size_t linesFound = 0;

std::string acc;

while (pos > 0 && linesFound <= maxLines)

{

const std::streamoff readSize = std::min<std::streamoff>(chunkSize, pos);

pos -= readSize;

ifs.seekg(pos, std::ios::beg);

buffer.assign(static_cast<std::size_t>(readSize), '\0');

ifs.read(&buffer[0], readSize);

if (!ifs)

break;

acc.insert(0, buffer);

linesFound = 0;

for (char c : acc)

if (c == '\n')

++linesFound;

if (linesFound > maxLines)

break;

}

std::vector<std::string> lines;

{

std::istringstream is(acc);

std::string line;

while (std::getline(is, line))

lines.push_back(line);

}

const std::size_t start = (lines.size() > maxLines) ? (lines.size() - maxLines) : 0;

std::cerr << "\n--- " << logPath.string() << " (last "

<< (lines.size() - start) << " lines) ---\n";

for (std::size_t i = start; i < lines.size(); ++i)

std::cerr << lines[i] << "\n";

std::cerr << "--- end ---\n\n";

}

#ifdef _WIN32

bool executable_on_path(const std::string &exeName)

{

char buf[MAX_PATH];

DWORD n = ::SearchPathA(nullptr, exeName.c_str(), nullptr,

static_cast<DWORD>(sizeof(buf)), buf, nullptr);

return n != 0 && n < sizeof(buf);

}

#else

static bool is_executable_file(const fs::path &p)

{

struct stat sb{};

if (::stat(p.c_str(), &sb) != 0)

return false;

if (!S_ISREG(sb.st_mode))

return false;

return (sb.st_mode & S_IXUSR) || (sb.st_mode & S_IXGRP) || (sb.st_mode & S_IXOTH);

}

bool executable_on_path(const std::string &exeName)

{

const char *pathEnv = vix::utils::vix_getenv("PATH");

if (!pathEnv)

return false;

std::string_view pathStr(pathEnv);

std::size_t start = 0;

while (start <= pathStr.size())

{

std::size_t end = pathStr.find(':', start);

if (end == std::string_view::npos)

end = pathStr.size();

std::string_view dir = pathStr.substr(start, end - start);

if (!dir.empty())

{

fs::path candidate = fs::path(std::string(dir)) / exeName;

if (is_executable_file(candidate))

return true;

}

start = end + 1;

}

return false;

}

#endif

} // namespace vix::cli::util

cli/src/util/Fs.cpp at main · vixcpp/cli · GitHub

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