42sh/bonus/parse_history.c

/*
** EPITECH PROJECT, 2025
** history_42sh
** File description:
** his for history
*/

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

#include "history.h"
#include "u_str.h"
#include "utils.h"

const parsing_history_t tab_fnct[] = {
    {"!!", &his_last_command},
    {"!$", &his_last_word},
    {"!*", &his_last_arg},
    {"![command]", &his_last_same_command},
    {"![number]", &his_id_command},
};

static
int cmd_history_is_in(char *line)
{
    for (int i = 0; line[i] != 0; i++)
        if (line[i] == CHAR_HIST &&
            (line[i + 1] != ' ' && line[i + 1] != '\t'
            && line[i + 1] != '\0'))
            return 0;
    return 1;
}

static
int is_two_char_cmd(char *line, int coord_x)
{
    if (line[coord_x] != CHAR_HIST)
        return -1;
    coord_x++;
    switch (line[coord_x]){
        case '!':
            return 0;
        case '$':
            return 1;
        case '*':
            return 2;
        default:
            return -1;
    }
}

static
int choose_id_or_last(his_variable_t *his_variable, int index_str, char *str)
{
    int mode = 0;
    const int cpy_index = index_str;

    if (str[index_str] != CHAR_HIST && is_a_token(str, index_str + 1) == false)
        return -1;
    index_str++;
    for (; str[index_str] != 0; index_str++){
        if (is_a_token(str, index_str) == true || isblank(str[index_str]))
            break;
        if (!isdigit(str[index_str]))
            mode = 1;
    }
    his_variable->coord_variable = cpy_index;
    his_variable->size_variable = index_str - cpy_index;
    his_variable->str = strn_to_ndup(cpy_index, (index_str - cpy_index), str);
    if (his_variable->str == NULL)
        return 3;
    his_variable->id = atoi(his_variable->str + 1);
    free(his_variable->str);
    return (mode == 1) ? 3 : 4;
}

static
int which_his_cmd(his_variable_t *his_variable, char const *line)
{
    for (int i = 0; line[i] != '\0'; i++){
        his_variable->type = is_two_char_cmd(line, i);
        if (his_variable->type != -1){
            his_variable->coord_variable = i;
            his_variable->size_variable = 2;
            return 0;
        }
        his_variable->type = choose_id_or_last(his_variable, i, line);
        if (his_variable->type != -1)
            return 0;
    }
    return 0;
}

static
char *replace_history(char *line, his_command_t *cmd_history)
{
    his_variable_t his_variable = {.coord_variable = 0,
        .id = 0, .size_variable = 0, .str = NULL, .type = -1};

    which_his_cmd(&his_variable, line);
    while (his_variable.type != -1){
        line = tab_fnct[his_variable.type].funct(line, &his_variable,
            cmd_history);
        if (line == NULL)
            return NULL;
        which_his_cmd(&his_variable, line);
    }
    return line;
}

int parse_history(char **pointer_line,
    size_t *buffer_len, size_t *buffer_sz, his_command_t **cmd_history)
{
    char *line = *pointer_line;

    *buffer_sz = 0;
    if (cmd_history_is_in(line) == 0){
        line = replace_history(line, *cmd_history);
        if (line == NULL)
            return 84;
        *buffer_len = u_strlen(line) + 1;
        *pointer_line = line;
        return 0;
    }
    return 0;
}