feat(config): added a simple user config

include/config.h

@@ -0,0 +1,20 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include "tomlc17.h"
+#include "utilities.h"
+
+typedef struct {
+    char *name;
+    char *email;
+} UserTable;
+
+typedef struct {
+    UserTable user;
+} Config;
+
+int load_config(Config*);
+void free_config(Config*);
+int validate_config(Config*);
+
+#endif // CONFIG_H

src/config.c

@@ -0,0 +1,150 @@
+#include "config.h"
+
+// Initialize config with defaults
+static void init_default_config(Config* config) {
+    config->user.name = NULL;
+    config->user.email = NULL;
+}
+
+// Free config memory
+void free_config(Config* config) {
+    if (!config) return;
+
+    free(config->user.name);
+    free(config->user.email);
+
+    memset(config, 0, sizeof(*config));
+}
+
+// Get XDG config directory
+static char* get_xdg_config_dir() {
+    char *xdg_config = getenv("XDG_CONFIG_HOME");
+    if (xdg_config && strlen(xdg_config) > 0) {
+        return strdup(xdg_config);
+    }
+
+    char *home = getenv("HOME");
+    if (!home) {
+        fprintf(stderr, "Error: HOME environment variable not set\n");
+        return NULL;
+    }
+
+    size_t len = strlen(home) + strlen("/.config") + 1;
+    char *config_dir = malloc(len);
+    if (!config_dir) {
+        perror("malloc");
+        return NULL;
+    }
+
+    snprintf(config_dir, len, "%s/.config", home);
+    return config_dir;
+}
+
+// Get config file path
+static char* get_config_path() {
+    char *config_dir = get_xdg_config_dir();
+    if (!config_dir) return NULL;
+
+    size_t len = strlen(config_dir) + strlen("/merk/config.toml") + 1;
+    char *config_path = malloc(len);
+    if (!config_path) {
+        free(config_dir);
+        return NULL;
+    }
+
+    snprintf(config_path, len, "%s/merk/config.toml", config_dir);
+    free(config_dir);
+
+    return config_path;
+}
+
+// Parse TOML config into Config
+static int parse_toml_config(toml_result_t result, Config* config) {
+    if (!result.ok) {
+        fprintf(stderr, "TOML parse error: %s\n", result.errmsg);
+        return -1;
+    }
+
+    toml_datum_t root = result.toptab;
+    if (root.type != TOML_TABLE) {
+        fprintf(stderr, "Root element is not a table\n");
+        return -1;
+    }
+
+    toml_datum_t user_table = toml_get(root, "user");
+    if (user_table.type != TOML_TABLE) {
+        fprintf(stderr, "Warning: 'user' table not found or invalid\n");
+        return 0;
+    }
+
+    toml_datum_t name = toml_get(user_table, "name");
+    if (name.type == TOML_STRING) {
+        config->user.name = strdup(name.u.s);
+        if (!config->user.name) {
+            perror("strdup");
+            return -1;
+        }
+    }
+
+    toml_datum_t email = toml_get(user_table, "email");
+    if (email.type == TOML_STRING) {
+        config->user.email = strdup(email.u.s);
+        if (!config->user.email) {
+            perror("strdup");
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+// Load configuration from file
+int load_config(Config* config) {
+    if (!config) return -1;
+
+    init_default_config(config);
+
+    char *config_path = get_config_path();
+
+    if (!config_path) {
+        fprintf(stderr, "Failed to get config path\n");
+        return -1;
+    }
+
+    if (access(config_path, F_OK) != 0) {
+        if (create_default_config_file(config_path) < 0) {
+            free(config_path);
+            return -1;
+        }
+    }
+
+    toml_result_t result = toml_parse_file_ex(config_path);
+    free(config_path);
+
+    int ret = parse_toml_config(result, config);
+    toml_free(result);
+
+    return ret;
+}
+
+// Validate configuration
+int validate_config(Config* config) {
+    if (!config) return -1;
+
+    if (!config->user.name || strlen(config->user.name) == 0) {
+        fprintf(stderr, "Error: User name is required\n");
+        return -1;
+    }
+
+    if (!config->user.email || strlen(config->user.email) == 0) {
+        fprintf(stderr, "Error: User email is required\n");
+        return -1;
+    }
+
+    if (!strchr(config->user.email, '@') || !strchr(config->user.email, '.')) {
+        fprintf(stderr, "Error: Invalid email format\n");
+        return -1;
+    }
+
+    return 0;
+}