Add support for vcpkg package features

include/project_parser.hpp

@@ -33,7 +33,13 @@ struct Package {
 struct Vcpkg {
     std::string version;
     std::string url;
-    std::vector<std::string> packages;
+
+    struct Package {
+        std::string name;
+        std::vector<std::string> features;
+    };
+
+    std::vector<Package> packages;
 };
 
 enum TargetType {

src/cmake_generator.cpp

@@ -579,8 +579,8 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
 
         // Show a nicer error than vcpkg when specifying an invalid package name
         for (const auto &package : project.vcpkg.packages) {
-            if (!vcpkg_valid_identifier(package)) {
-                throw std::runtime_error("Invalid [vcpkg].packages name '" + package + "' (needs to be lowercase alphanumeric)");
+            if (!vcpkg_valid_identifier(package.name)) {
+                throw std::runtime_error("Invalid [vcpkg].packages name '" + package.name + "' (needs to be lowercase alphanumeric)");
             }
         }
 
@@ -611,10 +611,31 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
         const auto &packages = project.vcpkg.packages;
         for (size_t i = 0; i < packages.size(); i++) {
             const auto &package = packages[i];
-            if (!vcpkg_valid_identifier(package)) {
-                throw std::runtime_error("Invalid vcpkg package name '" + package + "'");
+            const auto &features = package.features;
+            if (!vcpkg_valid_identifier(package.name)) {
+                throw std::runtime_error("Invalid vcpkg package name '" + package.name + "'");
+            }
+            for (const auto &feature : features) {
+                if (!vcpkg_valid_identifier(feature)) {
+                    throw std::runtime_error("Invalid vcpkg package feature '" + feature + "'");
+                }
+            }
+            if (features.empty()) {
+                ofs << "    \"" << package.name << '\"';
+            } else {
+                ofs << "    {\n";
+                ofs << "      \"name\": \"" << package.name << "\",\n";
+                ofs << "      \"features\": [";
+                for (size_t j = 0; j < features.size(); j++) {
+                    const auto &feature = features[j];
+                    ofs << '\"' << feature << '\"';
+                    if (j + 1 < features.size()) {
+                        ofs << ',';
+                    }
+                }
+                ofs << "]\n";
+                ofs << "    }";
             }
-            ofs << "    \"" << package << '\"';
             if (i + 1 < packages.size()) {
                 ofs << ',';
             }

src/project_parser.cpp

@@ -495,7 +495,26 @@ Project::Project(const Project *parent, const std::string &path, bool build) {
         auto &v = checker.create(toml, "vcpkg");
         v.optional("url", vcpkg.url);
         v.optional("version", vcpkg.version);
-        v.required("packages", vcpkg.packages);
+        for (const auto &p : v.find("packages").as_array()) {
+            Vcpkg::Package package;
+            const auto &package_str = p.as_string().str;
+            const auto open_bracket = package_str.find('[');
+            const auto close_bracket = package_str.find(']', open_bracket);
+            if (open_bracket == std::string::npos && close_bracket == std::string::npos) {
+                package.name = package_str;
+            } else if (close_bracket != std::string::npos) {
+                package.name = package_str.substr(0, open_bracket);
+                const auto features = package_str.substr(open_bracket + 1, close_bracket - open_bracket - 1);
+                std::istringstream feature_stream{features};
+                std::string feature;
+                while (std::getline(feature_stream, feature, ',')) {
+                    package.features.emplace_back(feature);
+                }
+            } else {
+                throw std::runtime_error("Invalid vcpkg package '" + package_str + "'");
+            }
+            vcpkg.packages.emplace_back(std::move(package));
+        }
     }
 
     checker.check(conditions);