add user name placeholder (#10109)

* Add user name placeholder

* non-ASCII character support

* fix: Explicitly include <boost/nowide/cstdlib.hpp>

src/libslic3r/GCode.cpp

@@ -2041,6 +2041,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
     // Prepare the helper object for replacing placeholders in custom G-code and output filename.
     m_placeholder_parser_integration.parser = print.placeholder_parser();
     m_placeholder_parser_integration.parser.update_timestamp();
+    m_placeholder_parser_integration.parser.update_user_name();
     m_placeholder_parser_integration.context.rng = std::mt19937(std::chrono::high_resolution_clock::now().time_since_epoch().count());
     // Enable passing global variables between PlaceholderParser invocations.
     m_placeholder_parser_integration.context.global_config = std::make_unique<DynamicConfig>();

src/libslic3r/PlaceholderParser.cpp

@@ -27,6 +27,7 @@
 
 #include <boost/algorithm/string.hpp>
 #include <boost/nowide/convert.hpp>
+#include <boost/nowide/cstdlib.hpp>
 
 // Spirit v2.5 allows you to suppress automatic generation
 // of predefined terminals to speed up complation. With
@@ -71,6 +72,7 @@ PlaceholderParser::PlaceholderParser(const DynamicConfig *external_config) : m_e
     this->set("version", std::string(SoftFever_VERSION));
     this->apply_env_variables();
     this->update_timestamp();
+    this->update_user_name();
 }
 
 void PlaceholderParser::update_timestamp(DynamicConfig &config)
@@ -98,6 +100,12 @@ void PlaceholderParser::update_timestamp(DynamicConfig &config)
     config.set_key_value("second", new ConfigOptionInt(timeinfo->tm_sec));
 }
 
+void PlaceholderParser::update_user_name(DynamicConfig &config)
+{
+    const char* user = boost::nowide::getenv("USER") ? boost::nowide::getenv("USER") : boost::nowide::getenv("USERNAME") ? boost::nowide::getenv("USERNAME") : "unknown";
+    config.set_key_value("user", new ConfigOptionString(user));
+}
+
 static inline bool opts_equal(const DynamicConfig &config_old, const DynamicConfig &config_new, const std::string &opt_key)
 {
 	const ConfigOption *opt_old = config_old.option(opt_key);

src/libslic3r/PlaceholderParser.hpp

@@ -71,6 +71,9 @@ public:
     // Update timestamp, year, month, day, hour, minute, second variables at m_config.
     void update_timestamp() { update_timestamp(m_config); }
 
+    static void update_user_name(DynamicConfig &config);
+    void update_user_name() { update_user_name(m_config); }
+
 private:
 	// config has a higher priority than external_config when looking up a symbol.
     DynamicConfig 			 m_config;

src/libslic3r/PrintBase.cpp

@@ -69,6 +69,7 @@ std::string PrintBase::output_filename(const std::string &format, const std::str
     	cfg = *config_override;
     cfg.set_key_value("version", new ConfigOptionString(std::string(SoftFever_VERSION)));
     PlaceholderParser::update_timestamp(cfg);
+    PlaceholderParser::update_user_name(cfg);
     this->update_object_placeholders(cfg, default_ext);
     if (! filename_base.empty()) {
 		cfg.set_key_value("input_filename", new ConfigOptionString(filename_base + default_ext));