kicad/scripting/python_scripting.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2012 NBEE Embedded Systems, Miguel Angel Ajo <miguelangel@nbee.es>
* Copyright (C) 1992-2021 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 2
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file python_scripting.cpp
* @brief methods to add scripting capabilities inside Pcbnew
*/
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#include <python_scripting.h>
#include <cstdlib>
#include <cstring>
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#include <Python.h>
#include <sstream>
#include <eda_base_frame.h>
#include <gal/color4d.h>
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#include <gestfich.h>
#include <trace_helpers.h>
#include <kicad_string.h>
#include <macros.h>
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#include <kiface_ids.h>
#include <paths.h>
#include <pgm_base.h>
#include <settings/settings_manager.h>
#include <kiplatform/environment.h>
#include <wx/app.h>
#include <config.h>
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SCRIPTING::SCRIPTING()
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{
scriptingSetup();
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pybind11::initialize_interpreter();
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// Save the current Python thread state and release the Global Interpreter Lock.
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m_python_thread_state = PyEval_SaveThread();
}
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SCRIPTING::~SCRIPTING()
{
PyEval_RestoreThread( m_python_thread_state );
try
{
pybind11::finalize_interpreter();
}
catch( const std::runtime_error& exc )
{
wxLogError( wxT( "Run time error '%s' occurred closing Python scripting" ), exc.what() );
}
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}
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bool SCRIPTING::IsWxAvailable()
{
#ifdef KICAD_SCRIPTING_WXPYTHON
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return true;
#else
return false;
#endif
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}
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bool SCRIPTING::IsModuleLoaded( std::string& aModule )
{
PyLOCK lock;
using namespace pybind11::literals;
auto locals = pybind11::dict( "modulename"_a = aModule );
pybind11::exec( R"(
import sys
loaded = False
if modulename in sys.modules:
loaded = True
)", pybind11::globals(), locals );
return locals["loaded"].cast<bool>();
}
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bool SCRIPTING::scriptingSetup()
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{
#if defined( __WINDOWS__ )
#ifdef _MSC_VER
// Under vcpkg/msvc, we need to explicitly set the python home or else it'll start consuming
// system python registry keys and the like instead of the Python distributed with KiCad.
// We are going to follow the "unix" layout for the msvc/vcpkg distributions so executable
// files are in the /root/bin path and the Python library files are in the
// /root/lib/python3(/Lib,/DLLs) path(s).
wxFileName pyHome;
pyHome.Assign( Pgm().GetExecutablePath() );
pyHome.Normalize();
// MUST be called before Py_Initialize so it will to create valid default lib paths
if( !wxGetEnv( wxT( "KICAD_USE_EXTERNAL_PYTHONHOME" ), nullptr ) )
{
Py_SetPythonHome( pyHome.GetFullPath().c_str() );
}
#else
// Intended for msys2 but we could probably use the msvc equivalent code too
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// If our python.exe (in kicad/bin) exists, force our kicad python environment
wxString kipython = FindKicadFile( "python.exe" );
// we need only the path:
wxFileName fn( kipython );
kipython = fn.GetPath();
// If our python install is existing inside kicad, use it
// Note: this is useful only when another python version is installed
if( wxDirExists( kipython ) )
{
// clear any PYTHONPATH and PYTHONHOME env var definition: the default
// values work fine inside Kicad:
wxSetEnv( wxT( "PYTHONPATH" ), wxEmptyString );
wxSetEnv( wxT( "PYTHONHOME" ), wxEmptyString );
// Add our python executable path in first position:
wxString ppath;
wxGetEnv( wxT( "PATH" ), &ppath );
kipython << wxT( ";" ) << ppath;
wxSetEnv( wxT( "PATH" ), kipython );
}
#endif
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#elif defined( __WXMAC__ )
// Add default paths to PYTHONPATH
wxString pypath;
// Bundle scripting folder (<kicad.app>/Contents/SharedSupport/scripting)
pypath += PATHS::GetOSXKicadDataDir() + wxT( "/scripting" );
// $(KICAD_PATH)/scripting/plugins is always added in kicadplugins.i
if( wxGetenv("KICAD_PATH") != nullptr )
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{
pypath += wxT( ":" ) + wxString( wxGetenv("KICAD_PATH") );
}
// OSX_BUNDLE_PYTHON_SITE_PACKAGES_DIR is provided via the build system.
pypath += wxT( ":" ) + Pgm().GetExecutablePath() + wxT( OSX_BUNDLE_PYTHON_SITE_PACKAGES_DIR );
// Original content of $PYTHONPATH
if( wxGetenv( wxT( "PYTHONPATH" ) ) != nullptr )
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{
pypath = wxString( wxGetenv( wxT( "PYTHONPATH" ) ) ) + wxT( ":" ) + pypath;
}
// set $PYTHONPATH
wxSetEnv( "PYTHONPATH", pypath );
wxString pyhome;
pyhome += Pgm().GetExecutablePath() +
wxT( "Contents/Frameworks/Python.framework/Versions/Current" );
// set $PYTHONHOME
wxSetEnv( "PYTHONHOME", pyhome );
#else
wxString pypath;
if( wxGetEnv( wxT( "KICAD_RUN_FROM_BUILD_DIR" ), nullptr ) )
{
// When running from build dir, python module gets built next to Pcbnew binary
pypath = Pgm().GetExecutablePath() + wxT( "../pcbnew" );
}
else
{
// PYTHON_DEST is the scripts install dir as determined by the build system.
pypath = Pgm().GetExecutablePath() + wxT( "../" PYTHON_DEST );
}
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if( !wxIsEmpty( wxGetenv( wxT( "PYTHONPATH" ) ) ) )
pypath = wxString( wxGetenv( wxT( "PYTHONPATH" ) ) ) + wxT( ":" ) + pypath;
wxSetEnv( wxT( "PYTHONPATH" ), pypath );
#endif
wxFileName path( PyPluginsPath( true ) + wxT( "/" ) );
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// Ensure the user plugin path exists, and create it if not.
// However, if it cannot be created, this is not a fatal error.
if( !path.DirExists() && !path.Mkdir( wxS_DIR_DEFAULT, wxPATH_MKDIR_FULL ) )
wxLogError( _( "Could not create user scripting path %s." ), path.GetPath() );
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return true;
}
/**
* Run a python method from the Pcbnew module.
*
* @param aMethodName is the name of the method (like "pcbnew.myfunction" )
* @param aNames will contain the returned string
*/
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static void RunPythonMethodWithReturnedString( const char* aMethodName, wxString& aNames )
{
aNames.Clear();
PyLOCK lock;
PyErr_Clear();
PyObject* builtins = PyImport_ImportModule( "pcbnew" );
wxASSERT( builtins );
if( !builtins ) // Something is wrong in pcbnew.py module (incorrect version?)
return;
PyObject* globals = PyDict_New();
PyDict_SetItemString( globals, "pcbnew", builtins );
Py_DECREF( builtins );
// Build the python code
char cmd[1024];
snprintf( cmd, sizeof(cmd), "result = %s()", aMethodName );
// Execute the python code and get the returned data
PyObject* localDict = PyDict_New();
PyObject* pobj = PyRun_String( cmd, Py_file_input, globals, localDict);
Py_DECREF( globals );
if( pobj )
{
PyObject* str = PyDict_GetItemString(localDict, "result" );
const char* str_res = nullptr;
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if(str)
{
PyObject* temp_bytes = PyUnicode_AsEncodedString( str, "UTF-8", "strict" );
if( temp_bytes != nullptr )
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{
str_res = PyBytes_AS_STRING( temp_bytes );
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aNames = FROM_UTF8( str_res );
Py_DECREF( temp_bytes );
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}
else
{
wxLogMessage( "cannot encode Unicode python string" );
}
}
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else
{
aNames = wxString();
}
Py_DECREF( pobj );
}
Py_DECREF( localDict );
if( PyErr_Occurred() )
wxLogMessage( PyErrStringWithTraceback() );
}
wxString PyEscapeString( const wxString& aSource )
{
wxString converted;
for( wxUniChar c: aSource )
{
if( c == '\\' )
converted += "\\\\";
else if( c == '\'' )
converted += "\\\'";
else if( c == '\"' )
converted += "\\\"";
else
converted += c;
}
return converted;
}
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void UpdatePythonEnvVar( const wxString& aVar, const wxString& aValue )
{
char cmd[1024];
// Ensure the interpreter is initialized before we try to interact with it.
if( !Py_IsInitialized() )
return;
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wxLogTrace( traceEnvVars, "UpdatePythonEnvVar: Updating Python variable %s = %s",
aVar, aValue );
wxString escapedVar = PyEscapeString( aVar );
wxString escapedVal = PyEscapeString( aValue );
snprintf( cmd, sizeof( cmd ),
"# coding=utf-8\n" // The values could potentially be UTF8.
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"import os\n"
"os.environ[\"%s\"]=\"%s\"\n",
TO_UTF8( escapedVar ),
TO_UTF8( escapedVal ) );
PyLOCK lock;
int retv = PyRun_SimpleString( cmd );
if( retv != 0 )
wxLogError( "Python error %d running command:\n\n`%s`", retv, cmd );
}
wxString PyStringToWx( PyObject* aString )
{
wxString ret;
if( !aString )
return ret;
const char* str_res = nullptr;
PyObject* temp_bytes = PyUnicode_AsEncodedString( aString, "UTF-8", "strict" );
if( temp_bytes != nullptr )
{
str_res = PyBytes_AS_STRING( temp_bytes );
ret = FROM_UTF8( str_res );
Py_DECREF( temp_bytes );
}
else
{
wxLogMessage( "cannot encode Unicode python string" );
}
return ret;
}
wxArrayString PyArrayStringToWx( PyObject* aArrayString )
{
wxArrayString ret;
if( !aArrayString )
return ret;
int list_size = PyList_Size( aArrayString );
for( int n = 0; n < list_size; n++ )
{
PyObject* element = PyList_GetItem( aArrayString, n );
if( element )
{
const char* str_res = nullptr;
PyObject* temp_bytes = PyUnicode_AsEncodedString( element, "UTF-8", "strict" );
if( temp_bytes != nullptr )
{
str_res = PyBytes_AS_STRING( temp_bytes );
ret.Add( FROM_UTF8( str_res ), 1 );
Py_DECREF( temp_bytes );
}
else
{
wxLogMessage( "cannot encode Unicode python string" );
}
}
}
return ret;
}
wxString PyErrStringWithTraceback()
{
wxString err;
if( !PyErr_Occurred() )
return err;
PyObject* type;
PyObject* value;
PyObject* traceback;
PyErr_Fetch( &type, &value, &traceback );
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PyErr_NormalizeException( &type, &value, &traceback );
if( traceback == nullptr )
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{
traceback = Py_None;
Py_INCREF( traceback );
}
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PyException_SetTraceback( value, traceback );
PyObject* tracebackModuleString = PyUnicode_FromString( "traceback" );
PyObject* tracebackModule = PyImport_Import( tracebackModuleString );
Py_DECREF( tracebackModuleString );
PyObject* formatException = PyObject_GetAttrString( tracebackModule,
"format_exception" );
Py_DECREF( tracebackModule );
PyObject* args = Py_BuildValue( "(O,O,O)", type, value, traceback );
PyObject* result = PyObject_CallObject( formatException, args );
Py_XDECREF( formatException );
Py_XDECREF( args );
Py_XDECREF( type );
Py_XDECREF( value );
Py_XDECREF( traceback );
wxArrayString res = PyArrayStringToWx( result );
for( unsigned i = 0; i<res.Count(); i++ )
{
err += res[i] + wxT( "\n" );
}
PyErr_Clear();
return err;
}
/**
* Find the Python scripting path.
*/
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wxString SCRIPTING::PyScriptingPath( bool aUserPath )
{
wxString path;
//@todo This should this be a user configurable variable eg KISCRIPT?
if( aUserPath )
{
path = PATHS::GetUserScriptingPath();
}
else
{
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path = PATHS::GetStockScriptingPath();
}
wxFileName scriptPath( path );
scriptPath.MakeAbsolute();
// Convert '\' to '/' in path, because later python script read \n or \r
// as escaped sequence, and create issues, when calling it by PyRun_SimpleString() method.
// It can happen on Windows.
path = scriptPath.GetFullPath();
path.Replace( '\\', '/' );
return path;
}
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wxString SCRIPTING::PyPluginsPath( bool aUserPath )
{
// Note we are using unix path separator, because window separator sometimes
// creates issues when passing a command string to a python method by PyRun_SimpleString
return PyScriptingPath( aUserPath ) + '/' + "plugins";
}