fix #44

- the function for check for dark.txt
- a logic that remove dark.txt with switching the theme

Anwendung/header/header_dark_theme.c

@@ -0,0 +1,186 @@
+/*
+ *-------------------------------------------*
+ *                Projekt 122                *
+ *-------------------------------------------*
+ *  	Apache License, Version 2.0		     *
+ *-------------------------------------------*
+ *                                           *
+ *  Programm um das installieren von 		 *
+ *	Custom-ROM und GSIs auf Android-Geräte 	 *
+ *	zu erleichtern  						 *
+ *                                           *
+ *-------------------------------------------*
+ *      (C) Copyright 2024 Elias Mörz 		 *
+ *-------------------------------------------*
+ *											 *
+ *              Headerpart - dark_theme		 *
+ *											 *
+ *-------------------------------------------*
+ */
+
+/* headers */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <gtk/gtk.h>
+#include <unistd.h>  
+#include <sys/stat.h> 
+#include <sys/types.h> 
+#include "program_functions.h"
+
+#define CONFIG_DIR "~/Downloads/ROM-Install/config"
+#define CONFIG_FILE "dark.txt" 
+
+const char *current_theme = "light";
+
+// function that create the dir
+// thanks to my book for programming for linux
+void create_directory_if_not_exists(const char *path) 
+{
+    char expanded_path[512];
+    snprintf(expanded_path, sizeof(expanded_path), "%s", path);
+    char *home = getenv("HOME");
+    if (home != NULL) 
+    {
+        // use the full path
+        char *tilde_pos = strchr(expanded_path, '~');
+        if (tilde_pos != NULL) 
+        {
+            memmove(expanded_path + strlen(home), tilde_pos + 1, strlen(tilde_pos));
+            memcpy(expanded_path, home, strlen(home));
+        }
+    }
+
+    struct stat st = {0};
+    if (stat(expanded_path, &st) == -1) 
+    {
+        if (mkdir(expanded_path, 0700) == -1) 
+        {
+            perror("Fehler beim Erstellen des Verzeichnisses");
+            exit(EXIT_FAILURE);
+        }
+    }
+}
+
+// function that write the dark.txt
+// thanks to my book for programming for linux
+void write_dark_file() 
+{
+    // use the full path
+    char *home = getenv("HOME");
+    if (home == NULL) 
+    {
+        perror("Fehler beim Abrufen des Home-Verzeichnisses");
+        exit(EXIT_FAILURE);
+    }
+
+    char dir_path[512];
+    snprintf(dir_path, sizeof(dir_path), "%s/Downloads/ROM-Install/config", home);
+
+    // create the dir 
+    create_directory_if_not_exists(dir_path);
+
+    char path[512];
+    snprintf(path, sizeof(path), "%s/%s", dir_path, CONFIG_FILE);
+
+    FILE *file = fopen(path, "w");
+    if (file == NULL) 
+    {
+        perror("Fehler beim Öffnen der Datei zum Schreiben");
+        exit(EXIT_FAILURE);
+    }
+    fprintf(file, "dunkel");
+    fclose(file);
+    g_print("In die Datei '%s' geschrieben.\n", path);
+}
+
+// thanks to my book for programming for linux
+// function that delete the dark.txt
+void delete_dark_file() 
+{
+    // use the full path
+    char *home = getenv("HOME");
+    if (home == NULL) 
+    {
+        perror("Fehler beim Abrufen des Home-Verzeichnisses");
+        exit(EXIT_FAILURE);
+    }
+
+    char dir_path[512];
+    snprintf(dir_path, sizeof(dir_path), "%s/Downloads/ROM-Install/config", home);
+
+    char path[512];
+    snprintf(path, sizeof(path), "%s/%s", dir_path, CONFIG_FILE);
+
+    // try to remove the file
+    if (remove(path) == 0) 
+    {
+        g_print("Datei '%s' erfolgreich gelöscht.\n", path);
+    } 
+    else 
+    {
+        perror("Fehler beim Löschen der Datei");
+    }
+}
+
+// function that check if there are the dark.txt
+void check_dark_file() 
+{
+    // use the full path
+    char *home = getenv("HOME");
+    if (home == NULL) 
+    {
+        perror("Fehler beim Abrufen des Home-Verzeichnisses");
+        exit(EXIT_FAILURE);
+    }
+
+    char dir_path[512];
+    snprintf(dir_path, sizeof(dir_path), "%s/Downloads/ROM-Install/config", home);
+
+    char path[512];
+    snprintf(path, sizeof(path), "%s/%s", dir_path, CONFIG_FILE);
+
+    FILE *file = fopen(path, "r");
+    if (file != NULL) 
+    {
+        g_print("Dunkelheit\n");
+        current_theme = "dark";
+        fclose(file);
+    }
+
+    else 
+    {
+        g_print("Tag\n");
+    }
+}
+
+void check_dark_file_light() 
+{
+    // use the full path
+    char *home = getenv("HOME");
+    if (home == NULL) 
+    {
+        perror("Fehler beim Abrufen des Home-Verzeichnisses");
+        exit(EXIT_FAILURE);
+    }
+
+    char dir_path[512];
+    snprintf(dir_path, sizeof(dir_path), "%s/Downloads/ROM-Install/config", home);
+
+    char path[512];
+    snprintf(path, sizeof(path), "%s/%s", dir_path, CONFIG_FILE);
+
+    FILE *file = fopen(path, "r");
+    if (file != NULL) 
+    {
+        g_print("Tag\n");
+        current_theme = "light";
+        delete_dark_file();
+        fclose(file);
+    }
+
+    else 
+    {
+        g_print("Dunkelheit\n");
+    }
+}