42sh/src/expansion/expansion.c

#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../utils/ast/ast.h"

// static size_t var_len(char *start)
// {
//     char *iter = start;
//     while (*iter != ' ' && *iter != 0)
//         *iter++;
//     return iter - start;
// }

struct ast_command *expand(struct ast_command *command)
{
    if (command == NULL)
        return NULL;

    bool in_quotes = false;
    char *str;
    size_t len;
    struct list *l = command->command;

    while (l != NULL)
    {
        in_quotes = false;
        str = (char *)l->data;
        len = strlen(str);

        for (size_t i = 0; str[i] != '\0'; i++)
        {
            if (in_quotes)
            {
                // do nothing
            }
            else if (str[i] == '\'')
            {
                in_quotes = !in_quotes;
                memmove(&str[i], &str[i + 1], strlen(&str[i + 1]) + 1);
            }
            else if (str[i] == '$' && str[i + 1] != 0 && !isspace(str[i + 1]))
            {
                // size_t len = var_len(str + i + 1);
                // char *end = str + i + len + 1;
                // char c = *end;
                // *end = 0;
                // printf("var: %s\n", str + i + 1);
                // *end = c;
            }
        }

        if (in_quotes)
        {
            // error: quote not closed
        }

        if (len != strlen(str))
        {
            char *new_str = realloc(str, strlen(str) + 1);
            if (new_str == NULL)
            {
                // error: realloc fail
            }
            l->data = new_str;
        }

        l = l->next;
    }
    return command;
}

// int main()
// {
//     printf("Expansion module test\n");
//     struct ast_command ast_command;
//     // char str[] = "echo Hello $?";
//     char str[] = "echo Hello $AE86";
//     ast_command.command = list_append(NULL, str);

//     struct ast_command *command2 = expand(&ast_command);
//     printf("command2: %s\n", (char *)command2->command->data);

//     return 0;
// }