common_settings.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 Jon Evans <[email protected]>
 * Copyright (C) 2020-2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <set>
#include <fstream>
#include <sstream>
 
#include <paths.h>
#include <search_stack.h>
#include <settings/settings_manager.h>
#include <settings/common_settings.h>
#include <settings/json_settings_internals.h>
#include <settings/parameters.h>
#include <systemdirsappend.h>
#include <trace_helpers.h>
#include <wx/config.h>
#include <wx/log.h>
#include <wx/regex.h>
 
 
const std::set<wxString> envVarBlacklist =
 {
 wxT( "KICAD7_SYMBOL_DIR" ),
 wxT( "KICAD7_FOOTPRINT_DIR" ),
 wxT( "KICAD7_TEMPLATES_DIR" ),
 wxT( "KICAD7_3DMODEL_DIR" )
 };
 
 
const int commonSchemaVersion = 3;
 
COMMON_SETTINGS::COMMON_SETTINGS() :
 JSON_SETTINGS( "kicad_common", SETTINGS_LOC::USER, commonSchemaVersion ),
 m_Appearance(),
 m_Backup(),
 m_Env(),
 m_Input(),
 m_Graphics(),
 m_Session(),
 m_System(),
 m_DoNotShowAgain(),
 m_NetclassPanel(),
 m_PackageManager()
{
 /*
 * Automatic dark mode detection works fine on Mac.
 */
#if defined( __WXGTK__ ) || defined( __WXMSW__ )
 m_params.emplace_back( new PARAM_ENUM<ICON_THEME>( "appearance.icon_theme",
 &m_Appearance.icon_theme, ICON_THEME::AUTO, ICON_THEME::LIGHT, ICON_THEME::AUTO ) );
#else
  m_Appearance.icon_theme = ICON_THEME::AUTO;
#endif
 
 /*
 * Automatic icon scaling works fine on Mac. It works mostly fine on MSW, but perhaps not
 * uniformly enough to exclude the explicit controls there.
 */
#if defined( __WXGTK__ ) || defined( __WXMSW__ )
 m_params.emplace_back( new PARAM<int>( "appearance.icon_scale",
 &m_Appearance.icon_scale, 0 ) );
#else
 m_Appearance.icon_scale = 0.0;
#endif
 
 /*
 * Automatic canvas scaling works fine on all supported platforms, so it's no longer exposed as
 * a configuration option.
 */
 m_Appearance.canvas_scale = 0.0;
 
 /*
 * Menu icons are off by default on OSX and on for all other platforms.
 */
#ifdef __WXMAC__
 m_params.emplace_back( new PARAM<bool>( "appearance.use_icons_in_menus",
 &m_Appearance.use_icons_in_menus, false ) );
#else
 m_params.emplace_back( new PARAM<bool>( "appearance.use_icons_in_menus",
 &m_Appearance.use_icons_in_menus, true ) );
#endif
 
 /*
 * Font scaling hacks are only needed on GTK under wxWidgets 3.0.
 */
#if defined( __WXGTK__ ) && !wxCHECK_VERSION( 3, 1, 0 )
 m_params.emplace_back( new PARAM<bool>( "appearance.apply_icon_scale_to_fonts",
 &m_Appearance.apply_icon_scale_to_fonts, false ) );
#else
 m_Appearance.apply_icon_scale_to_fonts = false;
#endif
 
 m_params.emplace_back( new PARAM<bool>( "appearance.show_scrollbars",
 &m_Appearance.show_scrollbars, true ) );
 
 m_params.emplace_back( new PARAM<double>( "appearance.hicontrast_dimming_factor",
 &m_Appearance.hicontrast_dimming_factor, 0.8f ) );
 
 m_params.emplace_back( new PARAM<int>( "appearance.text_editor_zoom",
 &m_Appearance.text_editor_zoom, 0 ) );
 
 m_params.emplace_back( new PARAM<bool>( "auto_backup.enabled", &m_Backup.enabled, true ) );
 
 m_params.emplace_back( new PARAM<bool>( "auto_backup.backup_on_autosave",
 &m_Backup.backup_on_autosave, false ) );
 
 m_params.emplace_back( new PARAM<int>( "auto_backup.limit_total_files",
 &m_Backup.limit_total_files, 25 ) );
 
 m_params.emplace_back( new PARAM<unsigned long long>( "auto_backup.limit_total_size",
 &m_Backup.limit_total_size, 104857600 ) );
 
 m_params.emplace_back( new PARAM<int>( "auto_backup.limit_daily_files",
 &m_Backup.limit_daily_files, 5 ) );
 
 m_params.emplace_back( new PARAM<int>( "auto_backup.min_interval",
 &m_Backup.min_interval, 300 ) );
 
 m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "environment.vars",
 [&]() -> nlohmann::json
 {
 nlohmann::json ret = {};
 
 for( const std::pair<wxString, ENV_VAR_ITEM> entry : m_Env.vars )
 {
 const ENV_VAR_ITEM& var = entry.second;
 
 wxASSERT( entry.first == var.GetKey() );
 
 // Default values are never persisted
 if( var.IsDefault() )
 {
 wxLogTrace( traceEnvVars,
 wxS( "COMMON_SETTINGS: Env var %s skipping save (default)" ),
 var.GetKey() );
 continue;
 }
 
 wxString value = var.GetValue();
 
 // Vars that existed in JSON are persisted, but if they were overridden
 // externally, we persist the old value (i.e. the one that was loaded from JSON)
 if( var.GetDefinedExternally() )
 {
 if( var.GetDefinedInSettings() )
 {
 wxLogTrace( traceEnvVars,
 wxS( "COMMON_SETTINGS: Env var %s was overridden externally, " )
 "saving previously-loaded value %s",
 var.GetKey(), var.GetSettingsValue() );
 value = var.GetSettingsValue();
 }
 else
 {
 wxLogTrace( traceEnvVars,
 wxS( "COMMON_SETTINGS: Env var %s skipping save (external)" ),
 var.GetKey() );
 continue;
 }
 }
 
 wxLogTrace( traceEnvVars,
 wxS( "COMMON_SETTINGS: Saving env var %s = %s" ),
 var.GetKey(), value);
 
 std::string key( var.GetKey().ToUTF8() );
 ret[key] = value;
 }
 
 return ret;
 },
 [&]( const nlohmann::json& aJson )
 {
 if( !aJson.is_object() )
 return;
 
 for( const auto& entry : aJson.items() )
 {
 wxString key = wxString( entry.key().c_str(), wxConvUTF8 );
 wxString val = entry.value().get<wxString>();
 
 if( m_Env.vars.count( key ) )
 {
 if( m_Env.vars[key].GetDefinedExternally() )
 {
 wxLogTrace( traceEnvVars, wxS( "COMMON_SETTINGS: %s is defined externally" ),
 key );
 m_Env.vars[key].SetDefinedInSettings();
 m_Env.vars[key].SetSettingsValue( val );
 continue;
 }
 else
 {
 wxLogTrace( traceEnvVars, wxS( "COMMON_SETTINGS: Updating %s: %s -> %s"),
 key, m_Env.vars[key].GetValue(), val );
  m_Env.vars[key].SetValue( val );
 }
 }
 else
 {
 wxLogTrace( traceEnvVars, wxS( "COMMON_SETTINGS: Loaded new var: %s = %s" ),
 key, val );
 m_Env.vars[key] = ENV_VAR_ITEM( key, val );
 }
 
 m_Env.vars[key].SetDefinedInSettings();
 m_Env.vars[key].SetSettingsValue( val );
 }
 },
 {} ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.focus_follow_sch_pcb",
 &m_Input.focus_follow_sch_pcb, false ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.auto_pan", &m_Input.auto_pan, false ) );
 
 m_params.emplace_back( new PARAM<int>( "input.auto_pan_acceleration",
 &m_Input.auto_pan_acceleration, 5 ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.center_on_zoom",
 &m_Input.center_on_zoom, true ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.immediate_actions",
 &m_Input.immediate_actions, true ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.warp_mouse_on_move",
 &m_Input.warp_mouse_on_move, true ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.horizontal_pan",
 &m_Input.horizontal_pan, false ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.zoom_acceleration",
 &m_Input.zoom_acceleration, false ) );
 
#ifdef __WXMAC__
 int default_zoom_speed = 5;
#else
 int default_zoom_speed = 1;
#endif
 
 m_params.emplace_back( new PARAM<int>( "input.zoom_speed",
 &m_Input.zoom_speed, default_zoom_speed ) );
 
 m_params.emplace_back( new PARAM<bool>( "input.zoom_speed_auto",
 &m_Input.zoom_speed_auto, true ) );
 
 m_params.emplace_back( new PARAM<int>( "input.scroll_modifier_zoom",
 &m_Input.scroll_modifier_zoom, 0 ) );
 
 m_params.emplace_back( new PARAM<int>( "input.scroll_modifier_pan_h",
 &m_Input.scroll_modifier_pan_h, WXK_CONTROL ) );
 
 m_params.emplace_back( new PARAM<int>( "input.scroll_modifier_pan_v",
 &m_Input.scroll_modifier_pan_v, WXK_SHIFT ) );
 
 m_params.emplace_back( new PARAM_ENUM<MOUSE_DRAG_ACTION>( "input.mouse_left",
 &m_Input.drag_left, MOUSE_DRAG_ACTION::DRAG_SELECTED, MOUSE_DRAG_ACTION::DRAG_ANY,
 MOUSE_DRAG_ACTION::SELECT ) );
 
 m_params.emplace_back( new PARAM_ENUM<MOUSE_DRAG_ACTION>( "input.mouse_middle",
 &m_Input.drag_middle, MOUSE_DRAG_ACTION::PAN, MOUSE_DRAG_ACTION::SELECT,
 MOUSE_DRAG_ACTION::NONE ) );
 
 m_params.emplace_back( new PARAM_ENUM<MOUSE_DRAG_ACTION>( "input.mouse_right",
 &m_Input.drag_right, MOUSE_DRAG_ACTION::PAN, MOUSE_DRAG_ACTION::SELECT,
 MOUSE_DRAG_ACTION::NONE ) );
 
 m_params.emplace_back( new PARAM<int>( "graphics.opengl_antialiasing_mode",
 &m_Graphics.opengl_aa_mode, 1, 0, 2 ) );
 
 m_params.emplace_back( new PARAM<int>( "graphics.cairo_antialiasing_mode",
 &m_Graphics.cairo_aa_mode, 0, 0, 2 ) );
 
 m_params.emplace_back( new PARAM<int>( "system.autosave_interval",
 &m_System.autosave_interval, 600 ) );
 
#ifdef __WXMAC__
 m_params.emplace_back( new PARAM<wxString>( "system.text_editor",
 &m_System.text_editor, wxS( "/usr/bin/open -e" ) ) );
#else
 m_params.emplace_back( new PARAM<wxString>( "system.text_editor",
 &m_System.text_editor, wxS( "" ) ) );
#endif
 
 m_params.emplace_back( new PARAM<int>( "system.file_history_size",
 &m_System.file_history_size, 9 ) );
 
 m_params.emplace_back( new PARAM<wxString>( "system.language",
 &m_System.language, wxS( "Default" ) ) );
 
 m_params.emplace_back( new PARAM<wxString>( "system.pdf_viewer_name",
 &m_System.pdf_viewer_name, wxS( "" ) ) );
 
 m_params.emplace_back( new PARAM<bool>( "system.use_system_pdf_viewer",
 &m_System.use_system_pdf_viewer, true ) );
 
 m_params.emplace_back( new PARAM<wxString>( "system.working_dir",
 &m_System.working_dir, wxS( "" ) ) );
 
 m_params.emplace_back( new PARAM<int>( "system.clear_3d_cache_interval",
 &m_System.clear_3d_cache_interval, 30 ) );
 
 m_params.emplace_back( new PARAM<bool>( "do_not_show_again.zone_fill_warning",
 &m_DoNotShowAgain.zone_fill_warning, false ) );
 
 m_params.emplace_back( new PARAM<bool>( "do_not_show_again.env_var_overwrite_warning",
 &m_DoNotShowAgain.env_var_overwrite_warning, false ) );
 
 m_params.emplace_back( new PARAM<bool>( "do_not_show_again.scaled_3d_models_warning",
 &m_DoNotShowAgain.scaled_3d_models_warning, false ) );
 
 m_params.emplace_back( new PARAM<bool>( "do_not_show_again.data_collection_prompt",
 &m_DoNotShowAgain.data_collection_prompt, false ) );
 
 m_params.emplace_back( new PARAM<bool>( "session.remember_open_files",
 &m_Session.remember_open_files, false ) );
 
 m_params.emplace_back( new PARAM_LIST<wxString>( "session.pinned_symbol_libs",
 &m_Session.pinned_symbol_libs, {} ) );
 
 m_params.emplace_back( new PARAM_LIST<wxString>( "session.pinned_fp_libs",
 &m_Session.pinned_fp_libs, {} ) );
 
 m_params.emplace_back( new PARAM<int>( "netclass_panel.sash_pos",
 &m_NetclassPanel.sash_pos, 160 ) );
 
 m_params.emplace_back( new PARAM<int>( "package_manager.sash_pos",
 &m_PackageManager.sash_pos, 380 ) );
 
 registerMigration( 0, 1, std::bind( &COMMON_SETTINGS::migrateSchema0to1, this ) );
 registerMigration( 1, 2, std::bind( &COMMON_SETTINGS::migrateSchema1to2, this ) );
 registerMigration( 2, 3, std::bind( &COMMON_SETTINGS::migrateSchema2to3, this ) );
}
 
 
bool COMMON_SETTINGS::migrateSchema0to1()
{
 nlohmann::json::json_pointer mwp_pointer( "/input/mousewheel_pan"_json_pointer );
 
 bool mwp = false;
 
 try
 {
 mwp = m_internals->at( mwp_pointer );
 m_internals->At( "input" ).erase( "mousewheel_pan" );
 }
 catch( ... )
 {
 wxLogTrace( traceSettings, wxT( "COMMON_SETTINGS::Migrate 0->1: mousewheel_pan not found" ) );
 }
 
 if( mwp )
 {
 ( *m_internals )[nlohmann::json::json_pointer( "/input/horizontal_pan" )] = true;
 
 ( *m_internals )[nlohmann::json::json_pointer( "/input/scroll_modifier_pan_h" )] = WXK_SHIFT;
 ( *m_internals )[nlohmann::json::json_pointer( "/input/scroll_modifier_pan_v" )] = 0;
 ( *m_internals )[nlohmann::json::json_pointer( "/input/scroll_modifier_zoom" )] = WXK_CONTROL;
 }
 else
 {
 ( *m_internals )[nlohmann::json::json_pointer( "/input/horizontal_pan" )] = false;
 
 ( *m_internals )[nlohmann::json::json_pointer( "/input/scroll_modifier_pan_h" )] = WXK_CONTROL;
 ( *m_internals )[nlohmann::json::json_pointer( "/input/scroll_modifier_pan_v" )] = WXK_SHIFT;
 ( *m_internals )[nlohmann::json::json_pointer( "/input/scroll_modifier_zoom" )] = 0;
 }
 
 return true;
}
 
 
bool COMMON_SETTINGS::migrateSchema1to2()
{
 nlohmann::json::json_pointer v1_pointer( "/input/prefer_select_to_drag"_json_pointer );
 
 bool prefer_selection = false;
 
 try
 {
 prefer_selection = m_internals->at( v1_pointer );
 m_internals->at( nlohmann::json::json_pointer( "/input"_json_pointer ) ).erase( "prefer_select_to_drag" );
 }
 catch( ... )
 {
 wxLogTrace( traceSettings, wxT( "COMMON_SETTINGS::Migrate 1->2: prefer_select_to_drag not found" ) );
 }
 
 if( prefer_selection )
 ( *m_internals )[nlohmann::json::json_pointer( "/input/mouse_left" )] = MOUSE_DRAG_ACTION::SELECT;
 else
 ( *m_internals )[nlohmann::json::json_pointer( "/input/mouse_left" )] = MOUSE_DRAG_ACTION::DRAG_ANY;
 
 return true;
}
 
 
bool COMMON_SETTINGS::migrateSchema2to3()
{
 wxFileName cfgpath;
 cfgpath.AssignDir( SETTINGS_MANAGER::GetUserSettingsPath() );
 cfgpath.AppendDir( wxT( "3d" ) );
 cfgpath.SetFullName( wxS( "3Dresolver.cfg" ) );
 cfgpath.MakeAbsolute();
 
 std::vector<LEGACY_3D_SEARCH_PATH> legacyPaths;
 readLegacy3DResolverCfg( cfgpath.GetFullPath(), legacyPaths );
 
 // env variables have a limited allowed character set for names
 wxRegEx nonValidCharsRegex( wxS( "[^A-Z0-9_]+" ), wxRE_ADVANCED );
 
 for( const LEGACY_3D_SEARCH_PATH& path : legacyPaths )
 {
 wxString key = path.m_Alias;
 const wxString& val = path.m_Pathvar;
 
 // The 3d alias config didnt use the same naming restrictions as real env variables
 // We need to sanitize them
 
 // upper case only
 key.MakeUpper();
 // logically swap - with _
 key.Replace( wxS( "-" ), wxS( "_" ) );
 
 // remove any other chars
 nonValidCharsRegex.Replace( &key, wxEmptyString );
 
 if( !m_Env.vars.count( key ) )
 {
 wxLogTrace( traceEnvVars, wxS( "COMMON_SETTINGS: Loaded new var: %s = %s" ), key, val );
 m_Env.vars[key] = ENV_VAR_ITEM( key, val );
 }
 }
 
 if( cfgpath.FileExists() )
 {
 wxRemoveFile( cfgpath.GetFullPath() );
 }
 
 return true;
}
 
 
bool COMMON_SETTINGS::MigrateFromLegacy( wxConfigBase* aCfg )
{
 bool ret = true;
 
 ret &= fromLegacy<double>( aCfg, "CanvasScale", "appearance.canvas_scale" );
 ret &= fromLegacy<int>( aCfg, "IconScale", "appearance.icon_scale" );
 ret &= fromLegacy<bool>( aCfg, "UseIconsInMenus", "appearance.use_icons_in_menus" );
 ret &= fromLegacy<bool>( aCfg, "ShowEnvVarWarningDialog", "environment.show_warning_dialog" );
 
 auto load_env_vars =
 [&]()
 {
 wxString key, value;
 long index = 0;
 nlohmann::json::json_pointer ptr = m_internals->PointerFromString( "environment.vars" );
 
 aCfg->SetPath( "EnvironmentVariables" );
 ( *m_internals )[ptr] = nlohmann::json( {} );
 
 while( aCfg->GetNextEntry( key, index ) )
 {
 if( envVarBlacklist.count( key ) )
 {
 wxLogTrace( traceSettings, wxT( "Migrate Env: %s is blacklisted; skipping." ), key );
 continue;
 }
 
 value = aCfg->Read( key, wxEmptyString );
 
 if( !value.IsEmpty() )
 {
 ptr.push_back( key.ToStdString() );
 
 wxLogTrace( traceSettings, wxT( "Migrate Env: %s=%s" ), ptr.to_string(), value );
 ( *m_internals )[ptr] = value.ToUTF8();
 
 ptr.pop_back();
 }
 }
 
 aCfg->SetPath( ".." );
 };
 
 load_env_vars();
 
 bool mousewheel_pan = false;
 
 if( aCfg->Read( "MousewheelPAN", &mousewheel_pan ) && mousewheel_pan )
 {
 Set( "input.horizontal_pan", true );
 Set( "input.scroll_modifier_pan_h", static_cast<int>( WXK_SHIFT ) );
 Set( "input.scroll_modifier_pan_v", 0 );
 Set( "input.scroll_modifier_zoom", static_cast<int>( WXK_CONTROL ) );
 }
 
 ret &= fromLegacy<bool>( aCfg, "AutoPAN", "input.auto_pan" );
 ret &= fromLegacy<bool>( aCfg, "ImmediateActions", "input.immediate_actions" );
 ret &= fromLegacy<bool>( aCfg, "PreferSelectionToDragging", "input.prefer_select_to_drag" );
 ret &= fromLegacy<bool>( aCfg, "MoveWarpsCursor", "input.warp_mouse_on_move" );
 ret &= fromLegacy<bool>( aCfg, "ZoomNoCenter", "input.center_on_zoom" );
 
 // This was stored inverted in legacy config
 if( std::optional<bool> value = Get<bool>( "input.center_on_zoom" ) )
 Set( "input.center_on_zoom", !( *value ) );
 
 ret &= fromLegacy<int>( aCfg, "OpenGLAntialiasingMode", "graphics.opengl_antialiasing_mode" );
 ret &= fromLegacy<int>( aCfg, "CairoAntialiasingMode", "graphics.cairo_antialiasing_mode" );
 
 ret &= fromLegacy<int>( aCfg, "AutoSaveInterval", "system.autosave_interval" );
 ret &= fromLegacyString( aCfg, "Editor", "system.editor_name" );
 ret &= fromLegacy<int>( aCfg, "FileHistorySize", "system.file_history_size" );
 ret &= fromLegacyString( aCfg, "LanguageID", "system.language" );
 ret &= fromLegacyString( aCfg, "PdfBrowserName", "system.pdf_viewer_name" );
 ret &= fromLegacy<bool>( aCfg, "UseSystemBrowser", "system.use_system_pdf_viewer" );
 ret &= fromLegacyString( aCfg, "WorkingDir", "system.working_dir" );
 
 return ret;
}
 
 
void COMMON_SETTINGS::InitializeEnvironment()
{
 auto addVar =
 [&]( const wxString& aKey, const wxString& aDefault )
 {
 m_Env.vars[aKey] = ENV_VAR_ITEM( aKey, aDefault, aDefault );
 
 wxString envValue;
 
 if( wxGetEnv( aKey, &envValue ) == true && !envValue.IsEmpty() )
 {
 m_Env.vars[aKey].SetValue( envValue );
 m_Env.vars[aKey].SetDefinedExternally();
 wxLogTrace( traceEnvVars,
 wxS( "InitializeEnvironment: Entry %s defined externally as %s" ), aKey,
 envValue );
 }
 else
 {
 wxLogTrace( traceEnvVars, wxS( "InitializeEnvironment: Setting entry %s to default %s" ),
 aKey, aDefault );
 }
 };
 
 wxFileName basePath( PATHS::GetStockEDALibraryPath(), wxEmptyString );
 
 wxFileName path( basePath );
 path.AppendDir( wxT( "footprints" ) );
 addVar( wxT( "KICAD7_FOOTPRINT_DIR" ), path.GetFullPath() );
 
 path = basePath;
 path.AppendDir( wxT( "3dmodels" ) );
 addVar( wxT( "KICAD7_3DMODEL_DIR" ), path.GetFullPath() );
 
 addVar( wxT( "KICAD7_TEMPLATE_DIR" ), PATHS::GetStockTemplatesPath() );
 
 addVar( wxT( "KICAD_USER_TEMPLATE_DIR" ), PATHS::GetUserTemplatesPath() );
 
 addVar( wxT( "KICAD7_3RD_PARTY" ), PATHS::GetDefault3rdPartyPath() );
 
 path = basePath;
 path.AppendDir( wxT( "symbols" ) );
 addVar( wxT( "KICAD7_SYMBOL_DIR" ), path.GetFullPath() );
}
 
 
bool COMMON_SETTINGS::readLegacy3DResolverCfg( const wxString& path,
 std::vector<LEGACY_3D_SEARCH_PATH>& aSearchPaths )
{
 wxFileName cfgpath( path );
 
 // This should be the same as wxWidgets 3.0 wxPATH_NORM_ALL which is deprecated in 3.1.
 // There are known issues with environment variable expansion so maybe we should be using
 // our own ExpandEnvVarSubstitutions() here instead.
 cfgpath.Normalize( FN_NORMALIZE_FLAGS | wxPATH_NORM_ENV_VARS );
 wxString cfgname = cfgpath.GetFullPath();
 
 std::ifstream cfgFile;
 std::string cfgLine;
 
 if( !wxFileName::Exists( cfgname ) )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = "no 3D configuration file";
 ostr << " * " << errmsg.ToUTF8() << " '";
 ostr << cfgname.ToUTF8() << "'";
 wxLogTrace( traceSettings, "%s\n", ostr.str().c_str() );
 return false;
 }
 
 cfgFile.open( cfgname.ToUTF8() );
 
 if( !cfgFile.is_open() )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "Could not open configuration file" );
 ostr << " * " << errmsg.ToUTF8() << " '" << cfgname.ToUTF8() << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 return false;
 }
 
 int lineno = 0;
 LEGACY_3D_SEARCH_PATH al;
 size_t idx;
 int vnum = 0; // version number
 
 while( cfgFile.good() )
 {
 cfgLine.clear();
 std::getline( cfgFile, cfgLine );
 ++lineno;
 
 if( cfgLine.empty() )
 {
 if( cfgFile.eof() )
 break;
 
 continue;
 }
 
 if( 1 == lineno && cfgLine.compare( 0, 2, "#V" ) == 0 )
 {
 // extract the version number and parse accordingly
 if( cfgLine.size() > 2 )
 {
 std::istringstream istr;
 istr.str( cfgLine.substr( 2 ) );
 istr >> vnum;
 }
 
 continue;
 }
 
 idx = 0;
 
 if( !getLegacy3DHollerith( cfgLine, idx, al.m_Alias ) )
 continue;
 
 // Don't add KICAD7_3DMODEL_DIR, one of its legacy equivalents, or KIPRJMOD from a
 // config file. They're system variables are are defined at runtime.
 if( al.m_Alias == wxS( "${KICAD7_3DMODEL_DIR}" ) || al.m_Alias == wxS( "${KIPRJMOD}" )
 || al.m_Alias == wxS( "$(KIPRJMOD)" ) || al.m_Alias == wxS( "${KISYS3DMOD}" )
 || al.m_Alias == wxS( "$(KISYS3DMOD)" ) )
 {
 continue;
 }
 
 if( !getLegacy3DHollerith( cfgLine, idx, al.m_Pathvar ) )
 continue;
 
 if( !getLegacy3DHollerith( cfgLine, idx, al.m_Description ) )
 continue;
 
 aSearchPaths.push_back( al );
 }
 
 cfgFile.close();
 
 return true;
}
 
 
bool COMMON_SETTINGS::getLegacy3DHollerith( const std::string& aString, size_t& aIndex,
 wxString& aResult )
{
 aResult.clear();
 
 if( aIndex >= aString.size() )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "bad Hollerith string on line" );
 ostr << " * " << errmsg.ToUTF8() << "\n'" << aString << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 
 return false;
 }
 
 size_t i2 = aString.find( '"', aIndex );
 
 if( std::string::npos == i2 )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "missing opening quote mark in config file" );
 ostr << " * " << errmsg.ToUTF8() << "\n'" << aString << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 
 return false;
 }
 
 ++i2;
 
 if( i2 >= aString.size() )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "invalid entry (unexpected end of line)" );
 ostr << " * " << errmsg.ToUTF8() << "\n'" << aString << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 
 return false;
 }
 
 std::string tnum;
 
 while( aString[i2] >= '0' && aString[i2] <= '9' )
 tnum.append( 1, aString[i2++] );
 
 if( tnum.empty() || aString[i2++] != ':' )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "bad Hollerith string on line" );
 ostr << " * " << errmsg.ToUTF8() << "\n'" << aString << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 
 return false;
 }
 
 std::istringstream istr;
 istr.str( tnum );
 size_t nchars;
 istr >> nchars;
 
 if( ( i2 + nchars ) >= aString.size() )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "invalid entry (unexpected end of line)" );
 ostr << " * " << errmsg.ToUTF8() << "\n'" << aString << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 
 return false;
 }
 
 if( nchars > 0 )
 {
 aResult = wxString::FromUTF8( aString.substr( i2, nchars ).c_str() );
 i2 += nchars;
 }
 
 if( i2 >= aString.size() || aString[i2] != '"' )
 {
 std::ostringstream ostr;
 ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
 wxString errmsg = wxS( "missing closing quote mark in config file" );
 ostr << " * " << errmsg.ToUTF8() << "\n'" << aString << "'";
 wxLogTrace( traceSettings, wxS( "%s\n" ), ostr.str().c_str() );
 
 return false;
 }
 
 aIndex = i2 + 1;
 return true;
}