r/plugin.h

// Written by retoor@molodetz.nl

// This source code initializes a Python interpreter within a plugin, executes a
// provided Python script with some basic imports, and finalizes the Python
// environment when done.

// This code does not use any non-standard imports or includes aside from
// Python.h and structmember.h which are part of Python's C API.

// MIT License

#include <Python.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <structmember.h>

bool plugin_initialized = false;

bool plugin_construct() {
  if (plugin_initialized)
    return true;

  Py_Initialize();
  if (!Py_IsInitialized()) {
    fprintf(stderr, "Failed to initialize the Python interpreter\n");
    return false;
  }
  plugin_initialized = true;
  return true;
}

void plugin_run(char *src) {
  plugin_construct();
  /*const char *basics =
      "import sys\n"
      "import os\n"
      "from os import *\n"
      "import math\n"
      "import pathlib\n"
      "from pathlib import Path\n"
      "import re\n"
      "import subprocess\n"
      "from subprocess import *\n"
      "import time\n"
      "from datetime import datetime\n"
      "%s";
  */
  const char *basics = "\n\n";
  size_t length = strlen(basics) + strlen(src);
  char *script = malloc(length + 1);
  sprintf(script, basics, src);
  script[length] = '\0';
  PyRun_SimpleString(script);
  free(script);
}

void plugin_destruct() {
  if (plugin_initialized)
    Py_Finalize();
}