modfetch/modfetch.c

#include "config.h"
#include "mod.h"
#include "semver.h"
#include "util.h"

#include <ctype.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <wordexp.h>

static const char *PNAME = "modfetch";

static const semver VERSION = {
    .major = 0,
    .minor = 1,
    .patch = 0,
};

int main(int argc, char *argv[]) {

    char *config_path;
    char *config_dir = getenv("XDG_CONFIG_HOME");
    if (config_dir == NULL) {
        char *home = getenv("$HOME");
        if (asprintf(&config_dir, "%s/.config", home) < 0) {
            fprintf(stderr, "error: failed formatting config dir (this shouldn't happen)");
            exit(EXIT_FAILURE);
        }
    }

    if (asprintf(&config_path, "%s/modfetch.conf", config_dir) < 0) {
        fprintf(stderr, "error: failed formatting config path (this shouldn't happen)");
        exit(EXIT_FAILURE);
    }

    for (size_t i = 1; i < (size_t)argc; ++i) {
        if (strcmp(argv[i], "-c") == 0 || strcmp(argv[i], "--config") == 0) {
            if (i == (size_t)argc - 1) {
                fprintf(stderr, "error: no config path passed\n");
                exit(EXIT_FAILURE);
            }

            i += 1;
            config_path = argv[i];
            continue;
        }

        if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
            fprintf(stderr, "%s: modular fetch [%s]\n", PNAME, svtoa(VERSION));
            fprintf(stderr, "\n");
            fprintf(stderr, "OPTIONS\n");
            fprintf(stderr, "\t-h, --help\t\t\tdisplays this help text\n");
            fprintf(stderr, "\t-c, --config /path/to/config\tchanges config path from the default ($XDG_CONFIG_HOME/%s.conf)\n", PNAME);
            exit(EXIT_SUCCESS);
        }
    }

    FILE *config_file = fopen(config_path, "r");

    if (config_file == NULL) {
        fprintf(stderr, "error: failed to open config at: %s\n", config_path);
        exit(EXIT_FAILURE);
    }

    Config config = parse_config(config_file);

    fclose(config_file);
    free(config_path);

    for (size_t i = 0; i < config.module_count; ++i) {
        Module current_module = config.modules[i];
        void *handle = dlopen(current_module.path, RTLD_NOW);
        if (handle == NULL) {
            fprintf(stderr, "error: failed opening module %s\n", current_module.path);
            fprintf(stderr, "%s\n", dlerror());
            exit(EXIT_FAILURE);
        }
        dlerror();

        // stupid fucking c standard issue
        // I'm not fixing this
        // https://stackoverflow.com/questions/14134245/iso-c-void-and-function-pointers
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
        semver (*mod_version)(void) = dlsym(handle, "version");
        const char *(*mod_name)(void) = dlsym(handle, "name");
        const char *(*mod_get)(void) = dlsym(handle, "get");
        void (*mod_init)(semver, char**) = dlsym(handle, "init");
#pragma GCC diagnostic pop

        mod_init(API_VERSION, current_module.config);

        (void)mod_name;
        (void)mod_version;
        // printf("%s: %s\n", mod_name(), svtoa(mod_version()));
        printf("%s\n", mod_get());
    }

    return 0;
}