cmkr/src/cmake_generator.cpp at main · build-cpp/cmkr · GitHub

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#include "cmake_generator.hpp"

#include "literals.hpp"

#include <resources/cmkr.hpp>

#include "fs.hpp"

#include "project_parser.hpp"

#include <algorithm>

#include <cstdio>

#include <memory>

#include <sstream>

#include <stdexcept>

#include <fstream>

namespace cmkr {

namespace gen {

Location: CMake/share/cmake-3.26/Modules

rg "set\(CMAKE_(.+)_SOURCE_FILE_EXTENSIONS"

Links:

- https://gitlab.kitware.com/cmake/cmake/-/issues/24340

- https://cmake.org/cmake/help/latest/command/enable_language.html

static tsl::ordered_map<std::string, std::vector<std::string>> known_languages = {

{"ASM", {".s", ".S", ".asm", ".abs", ".msa", ".s90", ".s43", ".s85", ".s51"}},

{"ASM-ATT", {".s", ".asm"}},

{"ASM_MARMASM", {".asm"}},

{"ASM_MASM", {".asm"}},

{"ASM_NASM", {".nasm", ".asm"}},

{"C", {".c", ".m"}},

{"CSharp", {".cs"}},

{"CUDA", {".cu"}},

{"CXX", {".C", ".M", ".c++", ".cc", ".cpp", ".cxx", ".m", ".mm", ".mpp", ".CPP", ".ixx", ".cppm"}},

{"Fortran", {".f", ".F", ".fpp", ".FPP", ".f77", ".F77", ".f90", ".F90", ".for", ".For", ".FOR", ".f95", ".F95", ".cuf", ".CUF"}},

{"HIP", {".hip"}},

{"ISPC", {".ispc"}},

{"Java", {".java"}},

{"OBJC", {".m"}},

{"OBJCXX", {".M", ".m", ".mm"}},

{"RC", {".rc", ".RC"}},

{"Swift", {".swift"}},

};

static std::string format(const char *format, const tsl::ordered_map<std::string, std::string> &variables) {

std::string s = format;

for (const auto &itr : variables) {

size_t start_pos = 0;

while ((start_pos = s.find(itr.first, start_pos)) != std::string::npos) {

s.replace(start_pos, itr.first.length(), itr.second);

start_pos += itr.second.length();

}

return s;

}

static std::string quoted(const std::string &str) {

return "\"" + str + "\"";

}

static std::string space_error_check(const std::string &str) {

auto pos = str.find_last_of(' ');

if (pos != std::string::npos)

return quoted(str) + " <------ !space(s)";

else

return quoted(str);

}

static std::vector<fs::path> expand_cmake_path(const fs::path &source_path, const fs::path &toml_dir, bool is_root_project) {

auto is_subdir = [](fs::path p, const fs::path &root) {

while (true) {

if (p == root) {

return true;

}

auto parent = p.parent_path();

if (parent == p) {

break;

}

p = parent;

}

return false;

};

if (!is_subdir(fs::absolute(toml_dir / source_path), toml_dir)) {

throw std::runtime_error("Path traversal is not allowed: " + source_path.string());

}

// Split the path at the first period (since fs::path::stem() and fs::path::extension() split at the last period)

std::string stem, extension;

auto filename = source_path.filename().string();

auto dot_position = filename.find('.');

if (dot_position != std::string::npos) {

stem = filename.substr(0, dot_position);

extension = filename.substr(dot_position);

} else {

stem = filename;

}

if (is_root_project && stem == "**" && !source_path.has_parent_path()) {

throw std::runtime_error("Recursive globbing not allowed in project root: " + source_path.string());

}

auto has_extension = [](const fs::path &file_path, const std::string &extension) {

auto path = file_path.string();

return path.rfind(extension) == path.length() - extension.length();

};

std::vector<fs::path> paths;

if (stem == "*") {

const auto directory = toml_dir / source_path.parent_path();

if (!fs::is_directory(directory)) {

throw std::runtime_error("Source directory not found: " + source_path.parent_path().string());

}

for (const auto &f : fs::directory_iterator(directory, fs::directory_options::follow_directory_symlink)) {

if (!f.is_directory() && has_extension(f.path(), extension)) {

paths.push_back(fs::relative(f, toml_dir));

}

} else if (stem == "**") {

const auto directory = toml_dir / source_path.parent_path();

if (!fs::is_directory(directory)) {

throw std::runtime_error("Source directory not found: " + source_path.parent_path().string());

}

for (const auto &f : fs::recursive_directory_iterator(directory, fs::directory_options::follow_directory_symlink)) {

if (!f.is_directory() && has_extension(f.path(), extension)) {

paths.push_back(fs::relative(f, toml_dir));

}

} else {

paths.push_back(source_path);

}

return paths;

}

static std::vector<std::string> expand_cmake_paths(const std::vector<std::string> &sources, const fs::path &toml_dir, bool is_root_project) {

std::vector<std::string> paths;

for (const auto &src : sources) {

auto expanded = expand_cmake_path(src, toml_dir, is_root_project);

for (const auto &f : expanded) {

paths.push_back(f.string());

}

// Normalize all paths to work with CMake (it needs a / on Windows as well)

for (auto &path : paths) {

std::replace(path.begin(), path.end(), '\\', '/');

}

// Sort paths alphabetically for consistent cross-OS generation

std::sort(paths.begin(), paths.end());

// TODO: remove duplicates

return paths;

}

static void create_file(const fs::path &path, const std::string &contents) {

if (!path.parent_path().empty()) {

fs::create_directories(path.parent_path());

}

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

if (!ofs) {

throw std::runtime_error("Failed to create " + path.string());

}

ofs << contents;

}

static std::string read_file(const fs::path &path) {

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

if (!ifs) {

throw std::runtime_error("Failed to read " + path.string());

}

std::string contents;

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

contents.resize(ifs.tellg());

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

ifs.read(&contents[0], contents.size());

return contents;

}

// CMake target name rules: https://cmake.org/cmake/help/latest/policy/CMP0037.html [A-Za-z0-9_.+\-]

// TOML bare keys: non-empty strings composed only of [A-Za-z0-9_-]

// We replace all non-TOML bare key characters with _

static std::string escape_project_name(const std::string &name) {

std::string escaped;

escaped.reserve(name.length());

for (auto ch : name) {

if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '_' || ch == '-') {

escaped += ch;

} else {

escaped += '_';

}

return escaped;

}

static void generate_gitfile(const char *gitfile, const std::vector<std::string> &desired_lines) {

// Reference: https://github.com/github/linguist/blob/master/docs/overrides.md#summary

auto lines = desired_lines;

auto generate = [&lines](const char *newline) {

std::string generated;

generated += "# cmkr";

generated += newline;

for (const auto &line : lines) {

generated += line;

generated += newline;

}

return generated;

};

if (!fs::exists(gitfile)) {

create_file(gitfile, generate("\n"));

} else {

auto contents = read_file(gitfile);

std::string line;

auto cr = 0, lf = 0;

auto flush_line = [&line, &lines]() {

auto itr = std::find(lines.begin(), lines.end(), line);

if (itr != lines.end()) {

lines.erase(itr);

}

line.clear();

};

for (size_t i = 0; i < contents.length(); i++) {

if (contents[i] == '\r') {

cr++;

continue;

}

if (contents[i] == '\n') {

lf++;

flush_line();

} else {

line += contents[i];

}

if (!line.empty()) {

flush_line();

}

if (!lines.empty()) {

// Append the cmkr .gitattributes using the detected newline

auto newline = cr == lf ? "\r\n" : "\n";

if (!contents.empty() && contents.back() != '\n') {

contents += newline;

}

contents += newline;

contents += generate(newline);

create_file(gitfile, contents);

}

void generate_project(const std::string &type) {

const auto name = escape_project_name(fs::current_path().stem().string());

if (fs::exists(fs::current_path() / "cmake.toml")) {

throw std::runtime_error("Cannot initialize a project when cmake.toml already exists!");

}

// Check if the folder is empty before creating any files

auto is_empty = fs::is_empty(fs::current_path());

// Automatically generate .gitattributes to not skew the statistics of the repo

generate_gitfile(".gitattributes", {"/**/CMakeLists.txt linguist-generated", "/**/cmkr.cmake linguist-vendored"});

// Generate .gitignore with reasonable defaults for CMake

generate_gitfile(".gitignore", {

"build*/",

"cmake-build*/",

"CMakerLists.txt",

"CMakeLists.txt.user",

"CMakeUserPresets.json",

});

tsl::ordered_map<std::string, std::string> variables = {

{"@name", name},

{"@type", type},

};

if (!is_empty) {

// Make a backup of an existing CMakeLists.txt if it exists

std::error_code ec;

fs::rename("CMakeLists.txt", "CMakeLists.txt.bak", ec);

// Create an empty cmake.toml for migration purporses

create_file("cmake.toml", format(toml_migration, variables));

return;

}

if (type == "executable") {

create_file("cmake.toml", format(toml_executable, variables));

create_file("src/" + name + "/main.cpp", format(cpp_executable, variables));

} else if (type == "static" || type == "shared" || type == "library") {

create_file("cmake.toml", format(toml_library, variables));

create_file("src/" + name + "/" + name + ".cpp", format(cpp_library, variables));

create_file("include/" + name + "/" + name + ".hpp", format(hpp_library, variables));

} else if (type == "interface") {

create_file("cmake.toml", format(toml_interface, variables));

create_file("include/" + name + "/" + name + ".hpp", format(hpp_interface, variables));

} else {

throw std::runtime_error("Unknown project type " + type + "! Supported types are: executable, library, shared, static, interface");

}

struct CommandEndl {

std::stringstream &ss;

explicit CommandEndl(std::stringstream &ss) : ss(ss) {

}

void endl() {

ss << '\n';

}

};

struct RawArg {

RawArg() = default;

explicit RawArg(std::string arg) : arg(std::move(arg)) {

}

std::string arg;

bool empty() const {

return arg.empty();

}

};

// Credit: JustMagic

struct Command {

std::stringstream &ss;

int depth = 0;

std::string command;

bool first_arg = true;

bool had_newline = false;

bool generated = false;

std::string post_comment;

Command(std::stringstream &ss, int depth, std::string command, std::string post_comment)

: ss(ss), depth(depth), command(std::move(command)), post_comment(std::move(post_comment)) {

}

~Command() noexcept(false) {

if (!generated) {

throw std::runtime_error("Incorrect usage of cmd(), you probably forgot ()");

}

static std::string quote(const std::string &str) {

// Quote an empty string

if (str.empty()) {

return "\"\"";

}

// Don't quote arguments that don't need quoting

// https://cmake.org/cmake/help/latest/manual/cmake-language.7.html#unquoted-argument

// NOTE: Normally '/' does not require quoting according to the documentation but this has been the case here

// previously, so for backwards compatibility its still here.

if (str.find_first_of("()#\"\\'> |/;") == std::string::npos)

return str;

std::string result;

result += "\"";

for (char ch : str) {

switch (ch) {

case '\\':

case '\"':

result += '\\';

default:

result += ch;

break;

}

result += "\"";

return result;

}

static std::string indent(int n) {

std::string result;

for (int i = 0; i < n; i++) {

result += '\t';

}

return result;

}

template <class T>

bool print_arg(const std::vector<T> &vec) {

if (vec.empty()) {

return true;

}

had_newline = true;

for (const auto &value : vec) {

print_arg(value);

}

return true;

}

template <class Key, class Value>

bool print_arg(const tsl::ordered_map<Key, Value> &map) {

if (map.empty()) {

return true;

}

for (const auto &itr : map) {

print_arg(itr);

}

return true;

}

template <class K>

bool print_arg(const std::pair<K, std::vector<std::string>> &kv) {

if (kv.second.empty()) {

return true;

}

had_newline = true;

print_arg(kv.first);

depth++;

for (const auto &s : kv.second) {

print_arg(s);

}

depth--;

return true;

}

template <class K, class V>

bool print_arg(const std::pair<K, V> &kv) {

if (kv.second.empty()) {

return true;

}

had_newline = true;

print_arg(kv.first);

depth++;

print_arg(kv.second);

depth--;

return true;

}

bool print_arg(const RawArg &arg) {

if (arg.empty()) {

return true;

}

if (had_newline) {

first_arg = false;

ss << '\n' << indent(depth + 1);

} else if (first_arg) {

first_arg = false;

} else {

ss << ' ';

}

ss << arg.arg;

return true;

}

template <class T>

bool print_arg(const T &value) {

std::stringstream tmp;

tmp << value;

auto str = tmp.str();

if (str.empty()) {

return true;

}

if (had_newline) {

first_arg = false;

ss << '\n' << indent(depth + 1);

} else if (first_arg) {

first_arg = false;

} else {

ss << ' ';

}

ss << quote(str);

return true;

}

template <class... Ts>

CommandEndl operator()(Ts &&...values) {

generated = true;

ss << indent(depth) << command << '(';

(void)std::initializer_list<bool>{print_arg(values)...};

if (had_newline)

ss << '\n' << indent(depth);

ss << ")";

if (!post_comment.empty()) {

ss << " # " << post_comment;

}

ss << "\n";

return CommandEndl(ss);

}

};

static std::string tolf(const std::string &str) {

std::string result;

for (char ch : str) {

if (ch != '\r') {

result += ch;

}

return result;

}

struct Generator {

Generator(const parser::Project &project, fs::path path) : project(project), path(std::move(path)) {

}

Generator(const Generator &) = delete;

const parser::Project &project;

fs::path path;

std::stringstream ss;

int indent = 0;

Command cmd(const std::string &command, const std::string &post_comment = "") {

if (command.empty())

throw std::invalid_argument("command cannot be empty");

if (command == "if") {

indent++;

return Command(ss, indent - 1, command, post_comment);

} else if (command == "else" || command == "elseif") {

return Command(ss, indent - 1, command, post_comment);

} else if (command == "endif") {

indent--;

}

return Command(ss, indent, command, post_comment);

}

CommandEndl comment(const std::string &comment) {

ss << Command::indent(indent) << "# " << comment << '\n';

return CommandEndl(ss);

}

void endl() {

ss << '\n';

}

void inject_includes(const std::vector<std::string> &includes) {

if (!includes.empty()) {

for (const auto &file : includes) {

if (!fs::exists(path / file)) {

throw std::runtime_error("Include not found: " + file);

}

cmd("include")(file);

}

void inject_cmake(const std::string &cmake) {

if (!cmake.empty()) {

if (cmake.back() == '\"') {

throw std::runtime_error("Detected additional \" at the end of cmake block");

}

auto cmake_lf = tolf(cmake);

while (!cmake_lf.empty() && cmake_lf.back() == '\n')

cmake_lf.pop_back();

bool did_indent = false;

for (char ch : cmake_lf) {

if (!did_indent) {

ss << Command::indent(indent);

did_indent = true;

} else if (ch == '\n') {

did_indent = false;

}

ss << ch;

}

ss << '\n';

}

template <typename T, typename Lambda>

void handle_condition(const parser::Condition<T> &value, const Lambda &fn) {

if (!value.empty()) {

for (const auto &itr : value) {

const auto &condition = itr.first;

auto endif = if_condition(condition);

if (!itr.second.empty()) {

fn(condition, itr.second);

}

if (endif) {

cmd("endif")().endl();

} else if (!itr.second.empty()) {

endl();

}

void conditional_includes(const parser::ConditionVector &include) {

handle_condition(include, [this](const std::string &, const std::vector<std::string> &includes) {

inject_includes(includes);

});

}

void conditional_cmake(const parser::Condition<std::string> &cmake) {

handle_condition(cmake, [this](const std::string &, const std::string &cmake) {

inject_cmake(cmake);

});

}

bool if_condition(const std::string &condition) {

if (condition.empty()) {

return false;

}

auto found = project.conditions.find(condition);

if (found == project.conditions.end()) {

if (cmkr::parser::Project::is_condition_name(condition)) {

// NOTE: this should have been caught by the parser already

throw std::runtime_error("Condition '" + condition + "' is not defined");

}

cmd("if", "NOTE: unnamed condition")(RawArg(cmake_condition(condition)));

} else {

cmd("if", condition)(RawArg(cmake_condition(found->second)));

}

return true;

}

private:

std::string cmake_condition(const std::string &condition) {

// HACK: this replaces '$<name>' with the value of the 'name' condition. We can safely

// reuse the generator expression syntax, because it is not valid in CMake conditions.

// TODO: properly handle quoted arguments (using a simple state machine):

// https://cmake.org/cmake/help/latest/manual/cmake-language.7.html#quoted-argument

std::string result = "";

bool in_replacement = false;

std::string temp;

for (size_t i = 0; i < condition.length(); i++) {

if (in_replacement) {

if (condition[i] == '>') {

in_replacement = false;

if (temp.empty()) {

throw std::runtime_error("Empty replacement in condition '" + condition + "'");

}

auto found = project.conditions.find(temp);

if (found == project.conditions.end()) {

throw std::runtime_error("Unknown condition '" + temp + "' in replacement");

}

auto has_space = found->second.find(' ') != std::string::npos;

if (has_space) {

result += '(';

}

result += found->second;

if (has_space) {

result += ')';

}

temp.clear();

} else {

temp += condition[i];

}

} else if (condition[i] == '$' && i + 1 < condition.length() && condition[i + 1] == '<') {

i++;

in_replacement = true;

} else {

result += condition[i];

}

if (!temp.empty()) {

throw std::runtime_error("Unterminated replacement in condition '" + condition + "'");

}

return result;

}

};

struct ConditionScope {

Generator &gen;

bool endif = false;

ConditionScope(Generator &gen, const std::string &condition) : gen(gen) {

endif = gen.if_condition(condition);

}

ConditionScope(const ConditionScope &) = delete;

ConditionScope(ConditionScope &&) = delete;

~ConditionScope() {

if (endif) {

gen.cmd("endif")();

}

};

static bool vcpkg_valid_identifier(const std::string &name) {

// [a-z0-9]+(-[a-z0-9]+)*

for (size_t i = 0; i < name.length(); i++) {

auto c = name[i];

if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || (i > 0 && c == '-')) {

continue;

}

return false;

}

return true;

}

static bool vcpkg_identifier_reserved(const std::string &name) {

// prn|aux|nul|con|lpt[1-9]|com[1-9]|core|default

if (name == "prn" || name == "aux" || name == "nul" || name == "con" || name == "core" || name == "default") {

return true;

}

if (name.length() == 4 && (name.compare(0, 3, "lpt") == 0 || name.compare(0, 3, "com") == 0) && (name[3] >= '1' && name[3] <= '9')) {

return true;

}

return false;

}

static std::string vcpkg_escape_identifier(const std::string &name) {

// Do a reasonable effort to escape the project name for use with vcpkg

std::string escaped;

for (char ch : name) {

if ((ch & 0x80) != 0) {

throw std::runtime_error("Non-ASCII characters are not allowed in [project].name when using [vcpkg]");

}

if (ch == '_' || ch == ' ') {

ch = '-';

}

if (ch >= 'A' && ch <= 'Z') {

ch += ('a' - 'A');

}

escaped += ch;

}

if (!vcpkg_valid_identifier(escaped)) {

throw std::runtime_error("The escaped project name '" + escaped + "' is not usable with [vcpkg]");

}

if (vcpkg_identifier_reserved(escaped)) {

throw std::runtime_error("The escaped project name '" + escaped + "' is a reserved name [vcpkg]");

}

return escaped;

}

void generate_cmake(const char *path, const parser::Project *parent_project) {

if (!fs::exists(fs::path(path) / "cmake.toml")) {

throw std::runtime_error("No cmake.toml found!");

}

// Root project doesn't have a parent

auto is_root_project = parent_project == nullptr;

parser::Project project(parent_project, path, false);

tsl::ordered_set<std::string> flat_project_languages;

for (const auto &itr : project.project_languages) {

for (const auto &language : itr.second) {

flat_project_languages.insert(language);

}

// Reference: https://gitlab.kitware.com/cmake/cmake/-/issues/24340#note_1304703

flat_project_languages.insert("RC");

// All acceptable extensions based off our given languages.

tsl::ordered_set<std::string> project_extensions;

for (const auto &language : flat_project_languages) {

auto itr = known_languages.find(language);

if (itr == known_languages.end()) {

if (project.project_allow_unknown_languages) {

printf("[warning] Unknown language '%s' specified\n", language.c_str());

} else {

throw std::runtime_error("Unknown language '" + language + "' specified");

}

} else {

project_extensions.insert(itr->second.begin(), itr->second.end());

}

auto contains_language_source = [&project_extensions](const std::vector<std::string> &sources) {

for (const auto &source : sources) {

auto extension = fs::path(source).extension().string();

if (project_extensions.count(extension) > 0) {

return true;

}

return false;

};

Generator gen(project, path);

// Helper lambdas for more convenient CMake generation

auto &ss = gen.ss;

auto cmd = [&gen](const std::string &command) {

return gen.cmd(command);

};

auto comment = [&gen](const std::string &comment) {

return gen.comment(comment);

};

auto endl = [&gen]() {

gen.endl();

};

std::string cmkr_url = "https://github.com/build-cpp/cmkr";

comment("This file is automatically generated from cmake.toml - DO NOT EDIT");

comment("See " + cmkr_url + " for more information");

endl();

if (is_root_project) {

cmd("cmake_minimum_required")("VERSION", project.cmake_version).endl();

if (!project.allow_in_tree) {

// clang-format off

cmd("if")("CMAKE_SOURCE_DIR", "STREQUAL", "CMAKE_BINARY_DIR");

cmd("message")("FATAL_ERROR", "In-tree builds are not supported. Run CMake from a separate directory: cmake -B build");

cmd("endif")().endl();

// clang-format on

}

if (project.project_msvc_runtime != parser::msvc_last) {

comment("Enable support for MSVC_RUNTIME_LIBRARY");

cmd("cmake_policy")("SET", "CMP0091", "NEW").endl();

}

cmd("set")("CMKR_ROOT_PROJECT", "OFF");

// clang-format off

cmd("if")("CMAKE_CURRENT_SOURCE_DIR", "STREQUAL", "CMAKE_SOURCE_DIR");

cmd("set")("CMKR_ROOT_PROJECT", "ON").endl();

if (!project.cmkr_include.empty()) {

comment("Bootstrap cmkr and automatically regenerate CMakeLists.txt");

cmd("include")(project.cmkr_include, "OPTIONAL", "RESULT_VARIABLE", "CMKR_INCLUDE_RESULT");

cmd("if")("CMKR_INCLUDE_RESULT");

cmd("cmkr")();

cmd("endif")().endl();

}

comment("Enable folder support");

cmd("set_property")("GLOBAL", "PROPERTY", "USE_FOLDERS", "ON").endl();

comment("Create a configure-time dependency on cmake.toml to improve IDE support");

if (project.cmake_minimum_version(3, 0)) {

cmd("set_property")("DIRECTORY", "APPEND", "PROPERTY", "CMAKE_CONFIGURE_DEPENDS", "cmake.toml");

} else {

cmd("configure_file")("cmake.toml", "cmake.toml", "COPYONLY");

}

if (project.project_msvc_runtime != parser::msvc_last) {

cmd("if")("NOT", "DEFINED", "CMAKE_MSVC_RUNTIME_LIBRARY");

switch (project.project_msvc_runtime) {

case parser::msvc_dynamic:

cmd("set")("CMAKE_MSVC_RUNTIME_LIBRARY", "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL");

break;

case parser::msvc_static:

cmd("set")("CMAKE_MSVC_RUNTIME_LIBRARY", "MultiThreaded$<$<CONFIG:Debug>:Debug>");

break;

default:

break;

}

cmd("endif")().endl();

}

cmd("endif")().endl();

// clang-format on

fs::path cmkr_include(project.cmkr_include);

if (!project.cmkr_include.empty() && !fs::exists(cmkr_include) && cmkr_include.is_relative()) {

create_file(cmkr_include, resources::cmkr);

}

} else {

comment("Create a configure-time dependency on cmake.toml to improve IDE support");

cmd("if")("CMKR_ROOT_PROJECT");

if (project.cmake_minimum_version(3, 0)) {

cmd("set_property")("DIRECTORY", "APPEND", "PROPERTY", "CMAKE_CONFIGURE_DEPENDS", "cmake.toml");

} else {

cmd("configure_file")("cmake.toml", "cmake.toml", "COPYONLY");

}

cmd("endif")().endl();

}

// TODO: remove support and replace with global compile-features

if (!project.cppflags.empty()) {

ss << "set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} \"";

for (const auto &flag : project.cppflags) {

ss << flag << " ";

}

ss << "\")\n\n";

}

// TODO: remove support and replace with global compile-features

if (!project.cflags.empty()) {

ss << "set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} \"";

for (const auto &flag : project.cflags) {

ss << flag << " ";

}

ss << "\")\n\n";

}

// TODO: remove support and replace with global linker-flags

if (!project.linkflags.empty()) {

ss << "set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} \"";

for (const auto &flag : project.linkflags) {

ss << flag << " ";

}

ss << "\")\n\n";

}

if (!project.options.empty()) {

comment("Options");

for (const auto &opt : project.options) {

std::string default_val;

if (opt.value.index() == 0) {

default_val = mpark::get<0>(opt.value) ? "ON" : "OFF";

} else {

default_val = mpark::get<1>(opt.value);

}

cmd("option")(opt.name, RawArg(Command::quote(opt.help)), default_val);

}

endl();

}

if (!project.variables.empty()) {

comment("Variables");

for (const auto &set : project.variables) {

std::string set_val;

if (set.value.index() == 1) {

set_val = mpark::get<1>(set.value);

} else {

set_val = mpark::get<0>(set.value) ? "ON" : "OFF";

}

if (set.cache) {

auto typ = set.value.index() == 1 ? "STRING" : "BOOL";

auto force = set.force ? "FORCE" : "";

cmd("set")(set.name, set_val, typ, set.help, force);

} else {

cmd("set")(set.name, set_val);

}

endl();

}

if (project.vcpkg.enabled()) {

comment("vcpkg settings");

auto emit_overlay = [&cmd](const std::string &name, const std::vector<std::string> &overlay) {

if (!overlay.empty()) {

std::vector<std::string> set_args;

for (const auto &directory : overlay) {

if (!fs::path(directory).is_relative()) {

throw std::runtime_error("[vcpkg] overlay is not a relative path: " + directory);

}

if (!fs::is_directory(directory)) {

throw std::runtime_error("[vcpkg] overlay is not a directory: " + directory);

}

set_args.emplace_back("${CMAKE_CURRENT_SOURCE_DIR}/" + directory);

}

cmd("set")(name, set_args);

}

};

emit_overlay("VCPKG_OVERLAY_PORTS", project.vcpkg.overlay_ports);

emit_overlay("VCPKG_OVERLAY_TRIPLETS", project.vcpkg.overlay_triplets);

}

gen.conditional_includes(project.include_before);

gen.conditional_cmake(project.cmake_before);

if (!project.project_name.empty()) {

auto languages = std::make_pair("LANGUAGES", project.project_languages[""]);

auto version = std::make_pair("VERSION", project.project_version);

auto description = std::make_pair("DESCRIPTION", project.project_description);

cmd("project")(project.project_name, languages, version, description);

for (const auto &language : project.project_languages[""]) {

if (language == "CSharp") {

cmd("include")("CSharpUtilities").endl();

break;

}

gen.handle_condition(project.project_languages, [&cmd](const std::string &condition, const std::vector<std::string> &languages) {

if (!condition.empty()) {

cmd("enable_language")(languages).endl();

for (const auto &language : languages) {

if (language == "CSharp") {

cmd("include")("CSharpUtilities").endl();

break;

}

});

}

gen.conditional_includes(project.include_after);

gen.conditional_cmake(project.cmake_after);

if (project.vcpkg.enabled()) {

if (!is_root_project) {

throw std::runtime_error("[vcpkg] is only supported in the root project");

}

// Allow the user to specify a url or derive it from the version

auto url = project.vcpkg.url;

auto version_name = url;

if (url.empty()) {

if (project.vcpkg.version.empty()) {

throw std::runtime_error("You need either [vcpkg].version or [vcpkg].url");

}

url = "https://github.com/microsoft/vcpkg/archive/refs/tags/" + project.vcpkg.version + ".tar.gz";

version_name = project.vcpkg.version;

}

// Show a nicer error than vcpkg when specifying an invalid package name

const auto &packages = project.vcpkg.packages;

for (const auto &package : packages) {

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