Improve the code related to [options]

docs/cmake-toml.md

@@ -94,6 +94,16 @@ include-before = ["cmake/before-subdir.cmake"]
 include-after = ["cmake/after-subdir.cmake"]
 ```
 
+## Options
+
+```toml
+[options]
+MYPROJECT_BUILD_TESTS = false
+MYPROJECT_SPECIAL_OPTION = { value = true, help = "Docstring for this option." }
+```
+
+Options correspond to [CMake cache variables](https://cmake.org/cmake/help/book/mastering-cmake/chapter/CMake%20Cache.html) that can be used to customize your project at configure-time. You can configure with `cmake -DMYPROJECT_BUILD_TESTS=ON` to enable the option. Every options automatically gets a corresponding [condition](#conditions).
+
 ## Variables
 
 ```toml

include/project_parser.hpp

@@ -16,16 +16,16 @@ using ConditionVector = Condition<std::vector<std::string>>;
 
 struct Variable {
     std::string name;
-    std::string comment;
-    mpark::variant<bool, std::string> val;
+    std::string help;
+    mpark::variant<bool, std::string> value;
     bool cache = false;
     bool force = false;
 };
 
 struct Option {
     std::string name;
-    std::string comment;
-    bool val = false;
+    std::string help;
+    bool value = false;
 };
 
 struct Package {

src/cmake_generator.cpp

@@ -656,7 +656,7 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
     if (!project.options.empty()) {
         comment("Options");
         for (const auto &opt : project.options) {
-            cmd("option")(opt.name, RawArg(Command::quote(opt.comment)), opt.val ? "ON" : "OFF");
+            cmd("option")(opt.name, RawArg(Command::quote(opt.help)), opt.value ? "ON" : "OFF");
         }
         endl();
     }
@@ -665,16 +665,16 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
         comment("Variables");
         for (const auto &set : project.variables) {
             std::string set_val;
-            if (set.val.index() == 1) {
-                set_val = mpark::get<1>(set.val);
+            if (set.value.index() == 1) {
+                set_val = mpark::get<1>(set.value);
             } else {
-                set_val = mpark::get<0>(set.val) ? "ON" : "OFF";
+                set_val = mpark::get<0>(set.value) ? "ON" : "OFF";
             }
 
             if (set.cache) {
-                auto typ = set.val.index() == 1 ? "STRING" : "BOOL";
+                auto typ = set.value.index() == 1 ? "STRING" : "BOOL";
                 auto force = set.force ? "FORCE" : "";
-                cmd("set")(set.name, set_val, typ, set.comment, force);
+                cmd("set")(set.name, set_val, typ, set.help, force);
             } else {
                 cmd("set")(set.name, set_val);
             }

src/project_parser.cpp

@@ -347,18 +347,18 @@ Project::Project(const Project *parent, const std::string &path, bool build) : p
             s.name = itr.first;
             const auto &value = itr.second;
             if (value.is_boolean()) {
-                s.val = value.as_boolean();
+                s.value = value.as_boolean();
             } else if (value.is_string()) {
-                s.val = value.as_string();
+                s.value = value.as_string();
             } else {
                 auto &setting = checker.create(value);
-                setting.optional("comment", s.comment);
+                setting.optional("help", s.help);
                 if (setting.contains("value")) {
                     const auto &v = setting.find("value");
                     if (v.is_boolean()) {
-                        s.val = v.as_boolean();
+                        s.value = v.as_boolean();
                     } else {
-                        s.val = v.as_string();
+                        s.value = v.as_string();
                     }
                 }
                 setting.optional("cache", s.cache);
@@ -376,13 +376,14 @@ Project::Project(const Project *parent, const std::string &path, bool build) : p
             o.name = itr.first;
             const auto &value = itr.second;
             if (value.is_boolean()) {
-                o.val = value.as_boolean();
+                o.value = value.as_boolean();
             } else {
                 auto &option = checker.create(value);
-                option.optional("comment", o.comment);
-                option.optional("value", o.val);
+                option.optional("help", o.help);
+                option.optional("value", o.value);
             }
             options.push_back(o);
+            conditions.emplace(o.name, o.name);
         }
     }
 
@@ -661,6 +662,7 @@ Project::Project(const Project *parent, const std::string &path, bool build) : p
 
             t.optional("add-function", tmplate.add_function);
             t.optional("pass-sources-to-add-function", tmplate.pass_sources_to_add_function);
+            t.optional("pass-sources", tmplate.pass_sources_to_add_function);
 
             templates.push_back(tmplate);
         }