42sh/src/main.c

// === Includes
#include <stdio.h>
#include <stdlib.h>

#include "execution/execution.h"
#include "io_backend/io_backend.h"
#include "lexer/lexer.h"
#include "parser/parser.h"
#include "utils/args/args.h"
#include "utils/vars/vars.h"

// === Error codes

#define SUCCESS 0
#define ERR_INPUT_PROCESSING 2
#define ERR_MALLOC 3
#define ERR_GENERIC 4

// === Functions

/* @brief: frees the hash map.
 * @return: always ERR_INPUT_PROCESSING.
 */
static int err_input(struct hash_map **vars)
{
    hash_map_free(vars);
    return ERR_INPUT_PROCESSING;
}

static int main_loop(struct lexer_context *ctx, struct args_options *options,
                     struct hash_map *vars)
{
    int return_code = SUCCESS;
    // Retrieve and build first AST
    struct ast *command_ast = get_ast(ctx);

    if (options->pretty_print)
    {
        ast_print_dot(command_ast);
    }

    // Main parse-execute loop
    while (command_ast != NULL && command_ast->type != AST_END)
    {
        if (command_ast->type != AST_VOID)
        {
            // Execute AST
            return_code = execution(command_ast, vars);

            // set $? variable
            set_var_int(vars, "?", return_code);
        }

        ast_free(&command_ast);

        // Retrieve and build next AST
        command_ast = get_ast(ctx);
    }

    if (command_ast == NULL)
        return err_input(&vars);

    ast_free(&command_ast);

    return return_code;
}

int main(int argc, char **argv)
{
    struct hash_map *vars = vars_init();
    if (vars == NULL)
    {
        fprintf(stderr, "Error: Failed to initialize variables hash map\n");
        return ERR_MALLOC;
    }

    // Create the options struct (with argument handler)
    struct args_options options;
    int return_code = args_handler(argc, argv, &options, vars);
    if (return_code != 0)
    {
        print_usage(stderr, argv[0]);
        return err_input(&vars);
    }
    // args_print(&options);

    // Initialize variables hash map

    // Create the IO-Backend context struct
    struct iob_context io_context = { 0 };

    // Convert args_options to iob_context
    return_code = iob_config_from_args(&options, &io_context);
    if (return_code != 0)
    {
        fprintf(stderr,
                "Error: Failed to configure IO Backend from arguments\n");
        return err_input(&vars);
    }

    // Init IO Backend (with the context struct)
    return_code = iob_init(&io_context);
    if (return_code != 0)
    {
        fprintf(stderr,
                "Error: IO Backend initialization failed with code %d\n",
                return_code);
        return err_input(&vars);
    }

    // init lexer context
    struct lexer_context ctx = { 0 };

    return_code = main_loop(&ctx, &options,vars);

    // === free

    hash_map_free(&vars);

    return return_code;
}