r/line.h

#include <readline/readline.h>
#include <readline/history.h>

#define HISTORY_FILE "~/.calpaca_history"

bool line_initialized =false;

char *line_command_generator(const char *text, int state) {
    static int list_index, len;
    const char *commands[] = {"help", "exit", "list", "review","refactor","opfuscate", NULL};

    if (!state) {
        list_index = 0;
        len = strlen(text);
    }

    while (commands[list_index]) {
        const char *command = commands[list_index++];
        if (strncmp(command, text, len) == 0) {
            return strdup(command);  
        }
    }

    return NULL;  
}

char **line_command_completion(const char *text, int start, int end) {
    rl_attempted_completion_over = 1;
    return rl_completion_matches(text, line_command_generator);
}

void line_init(){
    if(!line_initialized)
    {    
        rl_attempted_completion_function = line_command_completion;
        line_initialized = true;
         read_history(HISTORY_FILE);
    }
    
}

char * line_read(char * prefix) {
    char * data = readline(prefix);
    if(!(data || *data)){
        return NULL;
    }
    return data;
}
void line_add_history(char * data){
    read_history(HISTORY_FILE);
    add_history(data);
    write_history(HISTORY_FILE);
}