add popups

- close calendar
- close calendar and load a new one
- close application

#16

CMakeLists.txt

@@ -32,6 +32,7 @@ target_include_directories(imgui PUBLIC
 add_subdirectory(libs/libhydrogen EXCLUDE_FROM_ALL)
 
 add_executable(work-calendar
+    src/localization.c
     $<$<PLATFORM_ID:Windows>:src/main_win32.cpp>
     $<$<PLATFORM_ID:Linux>:src/main_linux.cpp>
 )
@@ -46,3 +47,8 @@ target_link_libraries(work-calendar
             glfw
         >
 )
+
+target_compile_definitions(work-calendar
+    PRIVATE
+        $<$<PLATFORM_ID:Windows>:_CRT_SECURE_NO_WARNINGS=1>
+)

src/localization.c

@@ -0,0 +1,101 @@
+#include "localization.h"
+
+const char *localized_strings_storage[LANGUAGE_COUNT][LOCALIZED_STRING_COUNT] = {
+    [L_GERMAN] = {
+        [LS_LANGUAGE_NAME] = "Deutsch",
+        [LS_JANUARY] = "Januar",
+        [LS_FEBRUARY] = "Februar",
+        [LS_MARCH] = "März",
+        [LS_APRIL] =  "April",
+        [LS_MAY] = "Mai",
+        [LS_JUNE] = "Juni",
+        [LS_JULY] = "Juli",
+        [LS_AUGUST] = "August",
+        [LS_SEPTEMBER] = "September",
+        [LS_OCTOBER] = "Oktober",
+        [LS_NOVEMBER] = "November",
+        [LS_DECEMBER] = "Dezember",
+        [LS_FILE] = "Datei",
+        [LS_OPEN] = "Öffnen",
+        [LS_SAVE] = "Speichern",
+        [LS_SAVE_AS] = "Speichern unter",
+        [LS_CLOSE_CALENDAR] = "Kalender schließen###CloseCalendar",
+        [LS_CLOSE_AND_LOAD_CALENDAR] = "Kalender schließen und laden###CloseLoadCalendar",
+        [LS_EXIT] = "Beenden###Close",
+        [LS_VIEW] = "Ansicht",
+        [LS_LEGEND] = "Legende",
+        [LS_LANGUAGE] = "Sprache",
+        [LS_HELP] = "Hilfe",
+        [LS_DEMO] = "Demo",
+        [LS_WIKI] = "Wiki",
+        [LS_ABOUT] = "Über",
+        [LS_CALENDAR_WEEK_SHORT] = "KW",
+        [LS_MONDAY_SHORT] = "Mo",
+        [LS_TUESDAY_SHORT] = "Di",
+        [LS_WEDNESDAY_SHORT] = "Mi",
+        [LS_THURSDAY_SHORT] = "Do",
+        [LS_FRIDAY_SHORT] = "Fr",
+        [LS_SATURDAY_SHORT] = "Sa",
+        [LS_SUNDAY_SHORT] = "So",
+        [LS_TITLE_ENTER_PASSWORD] = "Passwort eingeben###Save",
+        [LS_PASSWORD] = "Passwort",
+        [LS_CONFIRM_PASSWORD] = "Passwort bestätigen",
+        [LS_OK] = "Ok",
+        [LS_CANCEL] = "Abbrechen",
+        [LS_TITLE_OPEN_PASSWORD] = "Passwort eingeben###Open",
+        [LS_QUESTION_DO_YOU_REALLY_WANT_TO_QUIT] = "Es gibt noch offene Änderungen.\nMöchten Sie wirklich beenden?",
+        [LS_QUESTION_DO_YOU_REALLY_WANT_TO_CLOSE_THE_CALENDAR] = "Es gibt noch offene Änderungen.\nMöchten Sie wirklich den Kalender schließen?",
+        [LS_YES] = "Ja",
+        [LS_NO] = "Nein",
+    },
+    [L_ENGLISH] = {
+        [LS_LANGUAGE_NAME] = "English",
+        [LS_JANUARY] = "January",
+        [LS_FEBRUARY] = "February",
+        [LS_MARCH] = "March",
+        [LS_APRIL] =  "April",
+        [LS_MAY] = "May",
+        [LS_JUNE] = "June",
+        [LS_JULY] = "July",
+        [LS_AUGUST] = "August",
+        [LS_SEPTEMBER] = "September",
+        [LS_OCTOBER] = "October",
+        [LS_NOVEMBER] = "November",
+        [LS_DECEMBER] = "December",
+        [LS_FILE] = "File",
+        [LS_OPEN] = "Open",
+        [LS_SAVE] = "Save",
+        [LS_SAVE_AS] = "Save as",
+        [LS_CLOSE_CALENDAR] = "Close Calendar###CloseCalendar",
+        [LS_CLOSE_AND_LOAD_CALENDAR] = "Close and Load Calendar###CloseLoadCalendar",
+        [LS_EXIT] = "Exit",
+        [LS_VIEW] = "View",
+        [LS_LEGEND] = "Legend",
+        [LS_LANGUAGE] = "Language",
+        [LS_HELP] = "Help",
+        [LS_DEMO] = "Demo",
+        [LS_WIKI] = "Wiki",
+        [LS_ABOUT] = "About",
+        [LS_CALENDAR_WEEK_SHORT] = "No.",
+        [LS_MONDAY_SHORT] = "Mo",
+        [LS_TUESDAY_SHORT] = "Tu",
+        [LS_WEDNESDAY_SHORT] = "We",
+        [LS_THURSDAY_SHORT] = "Th",
+        [LS_FRIDAY_SHORT] = "Fr",
+        [LS_SATURDAY_SHORT] = "Sa",
+        [LS_SUNDAY_SHORT] = "Su",
+        [LS_TITLE_ENTER_PASSWORD] = "Enter Password###Save",
+        [LS_PASSWORD] = "Password",
+        [LS_CONFIRM_PASSWORD] = "Confirm Password",
+        [LS_OK] = "Ok",
+        [LS_CANCEL] = "Cancel",
+        [LS_TITLE_OPEN_PASSWORD] = "Enter Password###Open",
+        [LS_QUESTION_DO_YOU_REALLY_WANT_TO_QUIT] = "There are unsaved changes.\nDo you really want to quit?",
+        [LS_QUESTION_DO_YOU_REALLY_WANT_TO_CLOSE_THE_CALENDAR] = "There are unsaved changes.\nDo you really want to close the calendar?",
+        [LS_YES] = "Yes",
+        [LS_NO] = "No",
+    },
+    [L_FRENCH] = {
+        [LS_LANGUAGE_NAME] = "Français",
+    }
+};

src/localization.h

@@ -0,0 +1,68 @@
+#pragma once
+
+enum Localized_String {
+    LS_JANUARY,
+    LS_FEBRUARY,
+    LS_MARCH,
+    LS_APRIL,
+    LS_MAY,
+    LS_JUNE,
+    LS_JULY,
+    LS_AUGUST,
+    LS_SEPTEMBER,
+    LS_OCTOBER,
+    LS_NOVEMBER,
+    LS_DECEMBER,
+    LS_LANGUAGE_NAME,
+    LS_FILE,
+    LS_OPEN,
+    LS_SAVE,
+    LS_SAVE_AS,
+    LS_CLOSE_CALENDAR,
+    LS_CLOSE_AND_LOAD_CALENDAR,
+    LS_EXIT,
+    LS_VIEW,
+    LS_LEGEND,
+    LS_LANGUAGE,
+    LS_HELP,
+    LS_DEMO,
+    LS_WIKI,
+    LS_ABOUT,
+    LS_CALENDAR_WEEK_SHORT,
+    LS_MONDAY_SHORT,
+    LS_TUESDAY_SHORT,
+    LS_WEDNESDAY_SHORT,
+    LS_THURSDAY_SHORT,
+    LS_FRIDAY_SHORT,
+    LS_SATURDAY_SHORT,
+    LS_SUNDAY_SHORT,
+    LS_TITLE_ENTER_PASSWORD,
+    LS_PASSWORD,
+    LS_CONFIRM_PASSWORD,
+    LS_OK,
+    LS_CANCEL,
+    LS_TITLE_OPEN_PASSWORD,
+    //Questions
+    LS_QUESTION_DO_YOU_REALLY_WANT_TO_QUIT,
+    LS_QUESTION_DO_YOU_REALLY_WANT_TO_CLOSE_THE_CALENDAR,
+    LS_YES,
+    LS_NO,
+    LOCALIZED_STRING_COUNT
+};
+
+enum Language {
+    L_GERMAN,
+    L_ENGLISH,
+    L_FRENCH,
+    LANGUAGE_COUNT
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const char *localized_strings_storage[LANGUAGE_COUNT][LOCALIZED_STRING_COUNT];
+
+#ifdef __cplusplus
+}
+#endif

src/work-calendar.cpp

@@ -5,9 +5,11 @@
 #include <stdint.h>
 #include <hydrogen.h>
 
+#include "localization.h"
+
 #include "inter.h"
 #include "inter-bold.h"
-
+#include "font-awesome-solid.h"
 
 extern bool should_exit;
 extern bool show_demo_window;
@@ -22,6 +24,7 @@ static int current_day;
 //fonts
 static ImFont *inter_regular;
 static ImFont *inter_bold;
+static ImFont *font_awesome;
 
 char *open_file_dialog();
 char *save_file_dialog();
@@ -77,19 +80,53 @@ static uint8_t derived_key[hydro_secretbox_KEYBYTES];
 static char password_input_buffer[256];
 static char password_confirmation_input_buffer[256];
 
+static Language current_language = L_GERMAN; 
+static Language selected_language = L_GERMAN;
+
+const char *get_localized_string(Localized_String localized_string) {
+    if(localized_strings_storage[current_language][localized_string]) {
+        return localized_strings_storage[current_language][localized_string];
+    }
+
+    return localized_strings_storage[L_ENGLISH][localized_string];
+}
+
+static Localized_String month_names[] = { LS_JANUARY, LS_FEBRUARY, LS_MARCH, LS_APRIL, LS_MAY, LS_JUNE, LS_JULY, LS_AUGUST, LS_SEPTEMBER, LS_OCTOBER, LS_NOVEMBER, LS_DECEMBER };
+
+static char *save_file_path = NULL;
+static const char *wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki";
+
 void init() {
     hydro_init();
     ImGuiIO &io = ImGui::GetIO();
     inter_regular = io.Fonts->AddFontFromMemoryCompressedTTF(inter_compressed_data, inter_compressed_size);
     inter_bold    = io.Fonts->AddFontFromMemoryCompressedTTF(inter_bold_compressed_data, inter_bold_compressed_size);
+    font_awesome  = io.Fonts->AddFontFromMemoryCompressedTTF(font_awesome_solid_compressed_data, font_awesome_solid_compressed_size, 16.0f);
+
     year = get_current_year();
+    save_file_path = (char *)calloc(1, 1);
+
+    ImGuiSettingsHandler settings_handler = {};
+    settings_handler.TypeName = "Calendar";
+    settings_handler.TypeHash = ImHashStr("Calendar");
+    settings_handler.ReadOpenFn = [](ImGuiContext *context, ImGuiSettingsHandler *handler, const char *name) -> void * {
+        return (void *)-1;
+    };
+    settings_handler.ReadLineFn = [](ImGuiContext *context, ImGuiSettingsHandler *handler, void *entry, const char *line) {
+        if (strncmp(line, "language", sizeof("language") - 1) == 0) {
+            for (int i = 0; i < LANGUAGE_COUNT; i++) {
+                if (strncmp(line + sizeof("language"), localized_strings_storage[i][LS_LANGUAGE_NAME], strlen(localized_strings_storage[i][LS_LANGUAGE_NAME])) == 0)
+                    selected_language = (Language)i;
+            }
+        }
+    };
+    settings_handler.WriteAllFn = [](ImGuiContext *context, ImGuiSettingsHandler *handler, ImGuiTextBuffer *buffer) {
+        buffer->append("[Calendar][Settings]\n");
+        buffer->appendf("language=%s\n\n", get_localized_string(LS_LANGUAGE_NAME));
+    };
+    ImGui::AddSettingsHandler(&settings_handler);
 }
 
-static char *save_file_path = NULL;
-static const char *wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki";
-
-static const char *month_names[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
-
 typedef struct Category {
     bool editing;
     ImColor color;
@@ -124,6 +161,10 @@ static ImVec4 table_hover_color = ImVec4(0.0f, 0.3f, 0.6f, 0.2f);
 static char plaintext_buffer[2 * 1024 * 1024] = {};
 static char encrypted_buffer[hydro_secretbox_HEADERBYTES + sizeof(plaintext_buffer)];
 
+static bool unsaved_changes;
+static bool last_frame_unsaved_changes;
+static char *category_name_before_editing = NULL;
+
 void save(){
     if (!save_file_path) return;
 
@@ -165,10 +206,11 @@ void save(){
 
     set_window_title(title);
     free(title);
+
+    unsaved_changes = false;
 }
 
 void load(){
-
     FILE *save_file = fopen(save_file_path, "rb");
     size_t num_bytes = fread(encrypted_buffer, 1, sizeof(encrypted_buffer), save_file);
     fclose (save_file);
@@ -219,9 +261,38 @@ void load(){
 
     set_window_title(title);
     free(title);
+
+    unsaved_changes = false;
+}
+
+void close_calendar(){
+    if (save_file_path) free(save_file_path);
+    save_file_path = (char *)calloc(1, 1);
+    num_categories = 0;
+    num_categorized_days = 0;
+    hydro_memzero(categories, sizeof(categories));
+    hydro_memzero(categorized_days, sizeof(categorized_days));
+    hydro_memzero(derived_key, sizeof(derived_key));
+    set_window_title("Work Calendar");
+    unsaved_changes = false;
 }
 
 void per_frame(){
+    current_language = selected_language;
+
+    if(last_frame_unsaved_changes != unsaved_changes) {
+        char *title = (char *)calloc(1, strlen("Work Calendar - ") + strlen(save_file_path) + 2);
+        memcpy(title, "Work Calendar - ", strlen("Work Calendar - "));
+        memcpy(title + strlen(title), save_file_path, strlen(save_file_path));
+        if(unsaved_changes)
+            memcpy(title + strlen(title), "*", 1);
+
+        set_window_title(title);
+        free(title);
+        
+        last_frame_unsaved_changes = unsaved_changes;
+    }
+
     ImGuiStyle &style = ImGui::GetStyle();
     ImVec2 center = ImGui::GetMainViewport()->GetCenter();
 
@@ -241,13 +312,18 @@ void per_frame(){
     }
     ImGui::DockSpaceOverViewport(main_viewport_dock, ImGui::GetMainViewport(), ImGuiDockNodeFlags_NoTabBar);
     
-    ImGuiID close_popup  = ImGui::GetID("Close");
-    ImGuiID save_password_popup = ImGui::GetID("Passwort eingeben##Save");
-    ImGuiID open_password_popup = ImGui::GetID("Passwort eingeben##Open");
+    ImGuiID close_popup                   = ImGui::GetID("###Close");
+    ImGuiID close_calendar_popup          = ImGui::GetID("###CloseCalendar");
+    ImGuiID close_and_load_calendar_popup = ImGui::GetID("###CloseLoadCalendar");
+    ImGuiID save_password_popup           = ImGui::GetID("###Save");
+    ImGuiID open_password_popup           = ImGui::GetID("###Open");
 
     if (ImGui::BeginMainMenuBar()) {
-        if (ImGui::BeginMenu("Datei")) {
-            if (ImGui::MenuItem("Öffnen", "Ctrl + O")) {
+        if (ImGui::BeginMenu(get_localized_string(LS_FILE))) {
+            if (ImGui::MenuItem(get_localized_string(LS_OPEN), "Ctrl + O")) {
+                if(unsaved_changes) {
+                    ImGui::OpenPopup(close_and_load_calendar_popup);
+                } else {
                     char *new_save_file_path = open_file_dialog();
                     if (new_save_file_path) {
                         if (save_file_path) free(save_file_path);
@@ -255,11 +331,12 @@ void per_frame(){
                         ImGui::OpenPopup(open_password_popup);
                     }
                 }
-            if (ImGui::MenuItem("Speichern", "Ctrl + S", false, !!save_file_path)) {
+            }
+            if (ImGui::MenuItem(get_localized_string(LS_SAVE), "Ctrl + S", false, !!save_file_path)) {
                 save();
             }
 
-            if (ImGui::MenuItem("Speichern unter", "Ctrl + Shift + S")) {
+            if (ImGui::MenuItem(get_localized_string(LS_SAVE_AS), "Ctrl + Shift + S")) {
                 char *new_save_file_path = save_file_dialog();
                 if (new_save_file_path) {
                     if (save_file_path) free(save_file_path);
@@ -268,65 +345,71 @@ void per_frame(){
                 }
             }
 
-            //TODO
             ImGui::Separator();
-            if (ImGui::MenuItem("Kalender Schließen", "Ctrl + X")) {
-                //TODO if calendar is opened warning
-                
-                if (save_file_path) free(save_file_path);
-                save_file_path = NULL;
-                num_categories = 0;
-                num_categorized_days = 0;
-                hydro_memzero(categories, sizeof(categories));
-                hydro_memzero(categorized_days, sizeof(categorized_days));
-                hydro_memzero(derived_key, sizeof(derived_key));
-                set_window_title("Work Calendar");
+            if (ImGui::MenuItem(get_localized_string(LS_CLOSE_CALENDAR), "Ctrl + X")) {
+                if(unsaved_changes) {
+                    ImGui::OpenPopup(close_calendar_popup);
+                } else {
+                    close_calendar();
+                }
             }
 
             ImGui::Separator();
-            if (ImGui::MenuItem("Beenden", NULL)) {
+            if (ImGui::MenuItem(get_localized_string(LS_EXIT), NULL)) {
+                if(unsaved_changes) {
                     ImGui::OpenPopup(close_popup);
+                } else {
+                    should_exit = true;
+                }
             }
             ImGui::EndMenu();
         }
 
-        if (ImGui::BeginMenu("Ansicht")) {
-            ImGui::MenuItem("Legende", NULL, &legend_visible);
+        if (ImGui::BeginMenu(get_localized_string(LS_VIEW))) {
+            ImGui::MenuItem(get_localized_string(LS_LEGEND), NULL, &legend_visible);
+            if (ImGui::BeginMenu(get_localized_string(LS_LANGUAGE))) {
+                for (int language = 0; language < LANGUAGE_COUNT; language++) {
+                    if (ImGui::MenuItem(localized_strings_storage[language][LS_LANGUAGE_NAME], NULL, current_language == language))
+                        selected_language = (Language) language;
+                }
+                ImGui::EndMenu();
+            }
             ImGui::EndMenu();
         }
 
-        if (ImGui::BeginMenu("Hilfe")) {
-            ImGui::MenuItem("Demo", NULL, &show_demo_window);
-            if (ImGui::MenuItem("Wiki", NULL)) {
+        if (ImGui::BeginMenu(get_localized_string(LS_HELP))) {
+            ImGui::MenuItem(get_localized_string(LS_DEMO), NULL, &show_demo_window);
+            if (ImGui::MenuItem(get_localized_string(LS_WIKI), NULL)) {
                 ImGui::GetPlatformIO().Platform_OpenInShellFn(ImGui::GetCurrentContext(), wiki_url);
             }
             ImGui::Separator();
-            ImGui::MenuItem("Über", NULL); //TODO
+            ImGui::MenuItem(get_localized_string(LS_ABOUT), NULL); //TODO
             ImGui::EndMenu();
         }
 
         ImGui::EndMainMenuBar();
     }
 
+    // save calendar file with password modal dialogue 
     ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
-    if (ImGui::BeginPopupModal("Passwort eingeben##Save", NULL, ImGuiWindowFlags_AlwaysAutoResize)) {
+    if (ImGui::BeginPopupModal(get_localized_string(LS_TITLE_ENTER_PASSWORD), NULL, ImGuiWindowFlags_AlwaysAutoResize)) {
         ImGui::PushStyleVar(ImGuiStyleVar_FrameBorderSize, 1.0f);
 
         ImGui::AlignTextToFramePadding();
-        ImGui::Text("Passwort");
+        ImGui::Text("%s", get_localized_string(LS_PASSWORD));
         ImGui::SameLine();
         ImGui::SetNextItemWidth(-1);
-        ImGui::InputText("##Passwort", password_input_buffer, sizeof(password_input_buffer), ImGuiInputTextFlags_Password);
+        ImGui::InputText("##Password", password_input_buffer, sizeof(password_input_buffer), ImGuiInputTextFlags_Password);
 
         ImGui::AlignTextToFramePadding();
-        ImGui::Text("Passwort bestätigen");
+        ImGui::Text("%s", get_localized_string(LS_CONFIRM_PASSWORD));
         ImGui::SameLine();
         ImGui::SetNextItemWidth(-1);
-        ImGui::InputText("##Passwort bestätigen", password_confirmation_input_buffer, sizeof(password_confirmation_input_buffer), ImGuiInputTextFlags_Password);
+        ImGui::InputText("##Confirm_Password", password_confirmation_input_buffer, sizeof(password_confirmation_input_buffer), ImGuiInputTextFlags_Password);
 
         ImGui::PopStyleVar();
 
-        if (ImGui::Button("OK", ImVec2(120, 0))) { 
+        if (ImGui::Button(get_localized_string(LS_OK), ImVec2(120, 0))) { 
             if (hydro_compare((uint8_t *)password_input_buffer, (uint8_t *) password_confirmation_input_buffer, sizeof(password_input_buffer)) == 0) {
                 hydro_pwhash_deterministic(derived_key, sizeof derived_key, password_input_buffer, strlen(password_input_buffer), HYDROGEN_CONTEXT, 
                     master_key, HYDROGEN_OPSLIMIT, HYDROGEN_MEMLIMIT, HYDROGEN_THREADS);
@@ -339,7 +422,7 @@ void per_frame(){
         }
 
         ImGui::SameLine();
-        if (ImGui::Button("Abbrechen", ImVec2(120, 0))) { 
+        if (ImGui::Button(get_localized_string(LS_CANCEL), ImVec2(120, 0))) { 
             ImGui::CloseCurrentPopup(); 
             hydro_memzero(password_input_buffer, sizeof(password_input_buffer));
             hydro_memzero(password_confirmation_input_buffer, sizeof(password_confirmation_input_buffer));
@@ -348,19 +431,20 @@ void per_frame(){
         ImGui::EndPopup();
     }
 
+    // open calendar file with password modal dialogue 
     ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
-    if (ImGui::BeginPopupModal("Passwort eingeben##Open", NULL, ImGuiWindowFlags_AlwaysAutoResize)) {
+    if (ImGui::BeginPopupModal(get_localized_string(LS_TITLE_OPEN_PASSWORD), NULL, ImGuiWindowFlags_AlwaysAutoResize)) {
         ImGui::PushStyleVar(ImGuiStyleVar_FrameBorderSize, 1.0f);
 
         ImGui::AlignTextToFramePadding();
-        ImGui::Text("Passwort");
+        ImGui::Text("%s", get_localized_string(LS_PASSWORD));
         ImGui::SameLine();
         ImGui::SetNextItemWidth(-1);
         ImGui::InputText("##Passwort", password_input_buffer, sizeof(password_input_buffer), ImGuiInputTextFlags_Password);
 
         ImGui::PopStyleVar();
 
-        if (ImGui::Button("OK", ImVec2(120, 0))) { 
+        if (ImGui::Button(get_localized_string(LS_OK), ImVec2(120, 0))) { 
             hydro_pwhash_deterministic(derived_key, sizeof derived_key, password_input_buffer, strlen(password_input_buffer), HYDROGEN_CONTEXT, 
                 master_key, HYDROGEN_OPSLIMIT, HYDROGEN_MEMLIMIT, HYDROGEN_THREADS);
             hydro_memzero(password_input_buffer, sizeof(password_input_buffer));
@@ -370,9 +454,8 @@ void per_frame(){
         }
 
         ImGui::SameLine();
-        if (ImGui::Button("Abbrechen", ImVec2(120, 0))) { 
-            if (save_file_path) free(save_file_path);
-            save_file_path = NULL;
+        if (ImGui::Button(get_localized_string(LS_CANCEL), ImVec2(120, 0))) { 
+            close_calendar();
             ImGui::CloseCurrentPopup(); 
             hydro_memzero(password_input_buffer, sizeof(password_input_buffer));
         }
@@ -380,18 +463,64 @@ void per_frame(){
         ImGui::EndPopup(); 
     }
 
+    // close and load calendar modal dialogue
     ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
-    if (ImGui::BeginPopupModal("Close", NULL, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_AlwaysAutoResize)) {
-        ImGui::Text("Möchten Sie wirklich beenden?");
+    if (ImGui::BeginPopupModal(get_localized_string(LS_CLOSE_AND_LOAD_CALENDAR), NULL, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_AlwaysAutoResize)) {
+        ImGui::Text("%s", get_localized_string(LS_QUESTION_DO_YOU_REALLY_WANT_TO_CLOSE_THE_CALENDAR));
 
         ImGui::SetItemDefaultFocus();
-        if (ImGui::Button("Ja", ImVec2(120, 0))) { 
+        if (ImGui::Button(get_localized_string(LS_YES), ImVec2(120, 0))) { 
+            ImGui::CloseCurrentPopup(); 
+            close_calendar();
+
+            char *new_save_file_path = open_file_dialog();
+            if (new_save_file_path) {
+                if (save_file_path) free(save_file_path);
+                save_file_path = new_save_file_path;
+                ImGui::OpenPopup(open_password_popup);
+            }
+        }
+
+        ImGui::SameLine();
+        if (ImGui::Button(get_localized_string(LS_NO), ImVec2(120, 0))) { 
+            ImGui::CloseCurrentPopup(); 
+        }
+        
+        ImGui::EndPopup();
+    }
+
+    // close calendar modal dialogue
+    ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
+    if (ImGui::BeginPopupModal(get_localized_string(LS_CLOSE_CALENDAR), NULL, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_AlwaysAutoResize)) {
+        ImGui::Text("%s", get_localized_string(LS_QUESTION_DO_YOU_REALLY_WANT_TO_CLOSE_THE_CALENDAR));
+
+        ImGui::SetItemDefaultFocus();
+        if (ImGui::Button(get_localized_string(LS_YES), ImVec2(120, 0))) { 
+            close_calendar();
+            ImGui::CloseCurrentPopup(); 
+        }
+
+        ImGui::SameLine();
+        if (ImGui::Button(get_localized_string(LS_NO), ImVec2(120, 0))) { 
+            ImGui::CloseCurrentPopup(); 
+        }
+        
+        ImGui::EndPopup();
+    }
+
+    // close application modal dialogue
+    ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
+    if (ImGui::BeginPopupModal(get_localized_string(LS_EXIT), NULL, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_AlwaysAutoResize)) {
+        ImGui::Text("%s", get_localized_string(LS_QUESTION_DO_YOU_REALLY_WANT_TO_QUIT));
+
+        ImGui::SetItemDefaultFocus();
+        if (ImGui::Button(get_localized_string(LS_YES), ImVec2(120, 0))) { 
             should_exit = true;
             ImGui::CloseCurrentPopup(); 
         }
 
         ImGui::SameLine();
-        if (ImGui::Button("Nein", ImVec2(120, 0))) { 
+        if (ImGui::Button(get_localized_string(LS_NO), ImVec2(120, 0))) { 
             ImGui::CloseCurrentPopup(); 
         }
         
@@ -437,7 +566,7 @@ void per_frame(){
             if (ImGui::BeginTable("Month", 1, ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_NoHostExtendX)) {
                 ImGui::TableNextRow();
                 ImGui::TableSetColumnIndex(0);
-                ImGui::TextAligned(0.5, -FLT_MIN, month_names[month - 1]);
+                ImGui::TextAligned(0.5, -FLT_MIN, get_localized_string(month_names[month - 1]));
 
                 ImGui::TableNextRow();
                 ImGui::TableSetColumnIndex(0);
@@ -446,7 +575,7 @@ void per_frame(){
                 if (ImGui::BeginTable("CalendarWeek", 1, ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_NoHostExtendX | ImGuiTableFlags_Borders)){
                     ImGui::TableNextRow();
                     ImGui::TableSetColumnIndex(0);
-                    ImGui::TextAligned(0.5, -FLT_MIN, "KW");
+                    ImGui::TextAligned(0.5, -FLT_MIN, get_localized_string(LS_CALENDAR_WEEK_SHORT));
 
                     for (int day = 1; day <= days_per_month(year, month); day++) {
                         int weekday = weekday_from_day(year, month, day);
@@ -456,11 +585,11 @@ void per_frame(){
                             ImGui::TableSetColumnIndex(0);
 
                             //if first week has 3 or less days, last week from previous year
-                            int calender_week = calendar_week_from_day(year, month, day);
-                            if (calender_week == 0) {
+                            int calendar_week = calendar_week_from_day(year, month, day);
+                            if (calendar_week == 0) {
                                 ImGui::TextAligned(0.5, -FLT_MIN, "%d", 53);
                             } else {
-                                ImGui::TextAligned(0.5, -FLT_MIN, "%d", calender_week);
+                                ImGui::TextAligned(0.5, -FLT_MIN, "%d", calendar_week);
                             }
                         }
                     }
@@ -474,13 +603,13 @@ void per_frame(){
 
                 if (ImGui::BeginTable("Weekdays", 7, ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_NoHostExtendX | ImGuiTableFlags_Borders)){
 
-                    ImGui::TableSetupColumn("Mo");
-                    ImGui::TableSetupColumn("Di");
-                    ImGui::TableSetupColumn("Mi");
-                    ImGui::TableSetupColumn("Do");
-                    ImGui::TableSetupColumn("Fr");
-                    ImGui::TableSetupColumn("Sa");
-                    ImGui::TableSetupColumn("So");
+                    ImGui::TableSetupColumn(get_localized_string(LS_MONDAY_SHORT));
+                    ImGui::TableSetupColumn(get_localized_string(LS_TUESDAY_SHORT));
+                    ImGui::TableSetupColumn(get_localized_string(LS_WEDNESDAY_SHORT));
+                    ImGui::TableSetupColumn(get_localized_string(LS_THURSDAY_SHORT));
+                    ImGui::TableSetupColumn(get_localized_string(LS_FRIDAY_SHORT));
+                    ImGui::TableSetupColumn(get_localized_string(LS_SATURDAY_SHORT));
+                    ImGui::TableSetupColumn(get_localized_string(LS_SUNDAY_SHORT));
                     ImGui::TableHeadersRow();
 
                     ImGui::EndTable();
@@ -554,6 +683,7 @@ void per_frame(){
 
                         //apply selected color to field
                         if (selected_category != -1 && ImGui::IsItemClicked()) {
+                            unsaved_changes = true;
                             for (int i = 0; i < num_categorized_days; i++) {
                                 if (categorized_days[i].year  != year)  continue;
                                 if (categorized_days[i].month != month) continue;
@@ -632,6 +762,10 @@ void per_frame(){
                 if (category.editing) {
                     ImGui::SetNextItemWidth(-1);
                     if (ImGui::InputText("##name", category.name, IM_ARRAYSIZE(category.name), ImGuiInputTextFlags_EnterReturnsTrue)) {
+                        if (strcmp(category_name_before_editing, category.name) != 0) {
+                            unsaved_changes = true;
+                        }
+                        free(category_name_before_editing);
                         category.editing = false;
                     }
                 } else {
@@ -639,11 +773,23 @@ void per_frame(){
                 }
 
                 ImGui::TableSetColumnIndex(2);
-                if (ImGui::Button("e"))
+                ImGui::PushFont(font_awesome);
+                if (ImGui::Button("\uf304")) {
+                    if(!category.editing) {
+                        category_name_before_editing = _strdup(category.name);
+                    } else { 
+                        if (strcmp(category_name_before_editing, category.name) != 0) {
+                            unsaved_changes = true;
+                        }
+                        free(category_name_before_editing);
+                    }
                     category.editing = !category.editing;
+                }
+                ImGui::PopFont();
 
                 ImGui::TableSetColumnIndex(3);
-                if (ImGui::Button("d")) {
+                ImGui::PushFont(font_awesome);
+                if (ImGui::Button("\uf1f8")) {
                     for (size_t j = 0; j < num_categorized_days; j++) {
                         // Remove categorized days that have the to be deleted category
                         if (categorized_days[j].category == i) {
@@ -657,17 +803,22 @@ void per_frame(){
                     // Remove the category
                     for (size_t j = i; j < num_categories - 1; j++) categories[j] = categories[j + 1];
                     num_categories--;
+                    unsaved_changes = true;
                 }
+                ImGui::PopFont();
 
                 ImGui::PopID();
             }
 
             ImGui::TableNextRow();
             ImGui::TableSetColumnIndex(0);
+            ImGui::PushFont(font_awesome);
             if (ImGui::Button("+")) {
                 categories[num_categories] = {};
                 num_categories++;
+                unsaved_changes = true;
             }
+            ImGui::PopFont();
 
             ImGui::EndTable();
         }