Added '--print-to' cli option to print all possible 'to' constraints in sequence diagrams

src/cli/cli_handler.cc

@@ -129,8 +129,10 @@ 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");
+    app.add_flag("--print-from,--print-start-from", print_from,
+        "Print all possible 'from' values for a given diagram");
+    app.add_flag("--print-to", print_to,
+        "Print all possible 'to' values for a given diagram");
     app.add_flag("--no-validate", no_validate,
         "Do not perform configuration file schema validation");
     app.add_flag("--validate-only", validate_only,
@@ -149,7 +151,7 @@ cli_flow_t cli_handler::parse(int argc, const char **argv)
         exit(app.exit(e)); // NOLINT(concurrency-mt-unsafe)
     }
 
-    if (quiet || dump_config || print_start_from)
+    if (quiet || dump_config || print_from || print_to)
         verbose = 0;
     else
         verbose++;
@@ -202,11 +204,10 @@ cli_flow_t cli_handler::handle_pre_config_options()
         return cli_flow_t::kError;
     }
 
-    if (print_start_from) {
+    if (print_from || print_to) {
         if (diagram_names.size() != 1) {
-            LOG_ERROR(
-                "ERROR: '--print-start-from' requires specifying one diagram "
-                "name using '-n' option");
+            LOG_ERROR("ERROR: '--print-from' and '--print-to' require "
+                      "specifying one diagram name using '-n' option");
 
             return cli_flow_t::kError;
         }
@@ -346,7 +347,8 @@ 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.print_from = print_from;
+    cfg.print_to = print_to;
     cfg.progress = progress;
     cfg.thread_count = thread_count;
 

src/cli/cli_handler.h

@@ -33,7 +33,8 @@ namespace clanguml::cli {
 struct runtime_config {
     int verbose{};
     std::vector<clanguml::common::generator_type_t> generators{};
-    bool print_start_from{};
+    bool print_from{};
+    bool print_to{};
     bool progress{};
     unsigned int thread_count{};
 };
@@ -173,7 +174,8 @@ 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};
+    bool print_from{false};
+    bool print_to{false};
     std::optional<bool> paths_relative_to_pwd{};
     std::vector<std::string> template_variables{};
     bool list_templates{false};

src/common/generators/generators.cc

@@ -95,11 +95,20 @@ void generate_diagram_impl(const std::string &od, const std::string &name,
         std::move(progress));
 
     if constexpr (std::is_same_v<DiagramConfig, config::sequence_diagram>) {
-        if (rc.print_start_from) {
-            auto start_from_values = model->list_start_from_values();
+        if (rc.print_from) {
+            auto from_values = model->list_from_values();
 
-            for (const auto &start_from : start_from_values) {
-                std::cout << start_from << std::endl;
+            for (const auto &from : from_values) {
+                std::cout << from << std::endl;
+            }
+
+            return;
+        }
+        if (rc.print_to) {
+            auto to_values = model->list_to_values();
+
+            for (const auto &to : to_values) {
+                std::cout << "|" << to << "|" << std::endl;
             }
 
             return;

src/sequence_diagram/model/diagram.cc

@@ -193,18 +193,41 @@ bool diagram::should_include(
             dynamic_cast<const common::model::source_location &>(p));
 }
 
-std::vector<std::string> diagram::list_start_from_values() const
+std::vector<std::string> diagram::list_from_values() const
 {
     std::vector<std::string> result;
 
     for (const auto &[from_id, act] : sequences_) {
 
         const auto &from_activity = *(participants_.at(from_id));
-
-        result.push_back(from_activity.full_name(false));
+        const auto &full_name = from_activity.full_name(false);
+        if (!full_name.empty())
+            result.push_back(full_name);
     }
 
     std::sort(result.begin(), result.end());
+    result.erase(std::unique(result.begin(), result.end()), result.end());
+
+    return result;
+}
+
+std::vector<std::string> diagram::list_to_values() const
+{
+    std::vector<std::string> result;
+
+    for (const auto &[from_id, act] : sequences_) {
+        for (const auto &m : act.messages()) {
+            if (participants_.count(m.to()) > 0) {
+                const auto &to_activity = *(participants_.at(m.to()));
+                const auto &full_name = to_activity.full_name(false);
+                if (!full_name.empty())
+                    result.push_back(full_name);
+            }
+        }
+    }
+
+    std::sort(result.begin(), result.end());
+    result.erase(std::unique(result.begin(), result.end()), result.end());
 
     return result;
 }

src/sequence_diagram/model/diagram.h

@@ -232,11 +232,18 @@ public:
     bool should_include(const sequence_diagram::model::participant &p) const;
 
     /**
-     * @brief Get list of all possible 'start_from' values in the model
+     * @brief Get list of all possible 'from' values in the model
      *
-     * @return List of all possible 'start_from' values
+     * @return List of all possible 'from' values
      */
-    std::vector<std::string> list_start_from_values() const;
+    std::vector<std::string> list_from_values() const;
+
+    /**
+     * @brief Get list of all possible 'to' values in the model
+     *
+     * @return List of all possible 'to' values
+     */
+    std::vector<std::string> list_to_values() const;
 
     /**
      * @brief Generate a list of message chains matching a from_to constraint