Added option --print-start-from to list all possible 'start_from' values (fixes #94)

src/cli/cli_handler.cc

@@ -129,6 +129,8 @@ cli_flow_t cli_handler::parse(int argc, const char **argv)
         "instead of actual location of `.clang-uml` file.");
     app.add_flag("--no-metadata", no_metadata,
         "Skip metadata (e.g. clang-uml version) from diagrams");
+    app.add_flag("--print-start-from", print_start_from,
+        "Print all possible 'start_from' values for a given diagram");
 
     try {
         app.parse(argc, argv);
@@ -143,7 +145,7 @@ cli_flow_t cli_handler::parse(int argc, const char **argv)
         exit(app.exit(e)); // NOLINT(concurrency-mt-unsafe)
     }
 
-    if (quiet || dump_config)
+    if (quiet || dump_config || print_start_from)
         verbose = 0;
     else
         verbose++;
@@ -196,6 +198,16 @@ cli_flow_t cli_handler::handle_pre_config_options()
         return cli_flow_t::kError;
     }
 
+    if (print_start_from) {
+        if (diagram_names.size() != 1) {
+            LOG_ERROR(
+                "ERROR: '--print-start-from' requires specifying one diagram "
+                "name using '-n' option");
+
+            return cli_flow_t::kError;
+        }
+    }
+
     if (initialize) {
         return create_config_file();
     }
@@ -319,6 +331,18 @@ cli_flow_t cli_handler::handle_post_config_options()
     return cli_flow_t::kContinue;
 }
 
+runtime_config cli_handler::get_runtime_config() const
+{
+    runtime_config cfg;
+    cfg.generators = generators;
+    cfg.verbose = verbose;
+    cfg.print_start_from = print_start_from;
+    cfg.progress = progress;
+    cfg.thread_count = thread_count;
+
+    return cfg;
+}
+
 cli_flow_t cli_handler::print_version()
 {
     ostr_ << "clang-uml " << clanguml::version::CLANG_UML_VERSION << std::endl;
@@ -546,8 +570,8 @@ cli_flow_t cli_handler::add_config_diagram_from_template(
         return cli_flow_t::kError;
     }
 
-    // First, try to render the template using inja and create a YAML node from
-    // it
+    // First, try to render the template using inja and create a YAML node
+    // from it
     inja::json ctx;
     for (const auto &tv : template_variables) {
         const auto var = util::split(tv, "=");

src/cli/cli_handler.h

@@ -25,6 +25,19 @@
 #include <optional>
 
 namespace clanguml::cli {
+
+/**
+ * @brief This class holds command line parameters not directly related to
+ *        specific diagram configurations.
+ */
+struct runtime_config {
+    int verbose{};
+    std::vector<clanguml::common::generator_type_t> generators{};
+    bool print_start_from{};
+    bool progress{};
+    unsigned int thread_count{};
+};
+
 /**
  * This enum represents possible exit states of the command line parser.
  */
@@ -132,6 +145,13 @@ public:
      */
     bool ensure_output_directory_exists(const std::string &dir);
 
+    /**
+     * @brief Combines runtime configuration parameters into a single structure
+     *
+     * @return Runtime config instance
+     */
+    runtime_config get_runtime_config() const;
+
     std::string config_path{".clang-uml"};
     std::optional<std::string> compilation_database_dir{};
     std::vector<std::string> diagram_names{};
@@ -155,6 +175,7 @@ public:
     std::optional<std::string> add_include_diagram;
     std::optional<std::string> add_diagram_from_template;
     bool dump_config{false};
+    bool print_start_from{false};
     std::optional<bool> paths_relative_to_pwd{};
     std::vector<std::string> template_variables{};
     bool list_templates{false};