MVP version :)

.clang-format

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+

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+
+[*.{cpp,h,c,py,sh}]
+indent_style = space
+indent_size = 4
+
+[{Makefile,*.mk}]
+indent_size = tab

.gitignore

@@ -1,3 +1,5 @@
+dist/
+
 # Prerequisites
 *.d
 

README.md

@@ -1,2 +1,4 @@
 # flipper_passgen
-Flipper Zero Password Generator
+This is a simple Password Generator plugin (**fap**) for the [Flipper Zero](https://www.flipperzero.one).
+
+![preview](images/preview.png)

application.fam

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+App(
+    appid="passgen",
+    name="Password Generator",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="passgenapp",
+    requires=[
+        "gui",
+    ],
+    fap_category="Tools",
+    fap_icon="icons/passgen_icon.png",
+    fap_icon_assets="icons",
+)

passgen.c

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+#include <furi.h>
+#include <gui/gui.h>
+#include <gui/elements.h>
+#include <input/input.h>
+#include <notification/notification_messages.h>
+#include <stdlib.h>
+#include <passgen_icons.h>
+
+#define PASSGEN_MAX_LENGTH 16
+#define PASSGEN_CHARACTERS_LENGTH (26*4)
+
+#define PASSGEN_DIGITS "0123456789"
+#define PASSGEN_LETTERS_LOW "abcdefghijklmnopqrstuvwxyz"
+#define PASSGEN_LETTERS_UP "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#define PASSGEN_SPECIAL "!#$%^&*.-_"
+
+typedef enum PassGen_Alphabet
+{
+	Digits = 1,
+	Lowercase = 2,
+	
+	Uppercase = 4,
+	Special = 8,
+	
+	DigitsLower = Digits | Lowercase,
+	DigitsAllLetters = Digits | Lowercase | Uppercase,
+	Mixed = DigitsAllLetters | Special
+} PassGen_Alphabet;
+
+const int AlphabetLevels[] = { Digits, Lowercase, DigitsLower, DigitsAllLetters, Mixed };
+const char* AlphabetLevelNames[] = { "1234", "abcd", "ab12", "Ab12", "Ab1#" };
+const int AlphabetLevelsCount = sizeof(AlphabetLevels) / sizeof(int);
+
+const NotificationSequence PassGen_Alert_vibro = {
+    &message_vibro_on,
+    &message_blue_255,
+	&message_delay_50,
+    &message_vibro_off,
+    NULL,
+};
+
+typedef struct {
+    FuriMessageQueue* input_queue;
+    ViewPort* view_port;
+    Gui* gui;
+    FuriMutex** mutex;
+	NotificationApp* notify;
+	char password[PASSGEN_MAX_LENGTH+1];
+	char alphabet[PASSGEN_CHARACTERS_LENGTH+1];
+	int length;
+	int level;
+} PassGen;
+
+void state_free(PassGen* app) {
+    gui_remove_view_port(app->gui, app->view_port);
+    furi_record_close(RECORD_GUI);
+    view_port_free(app->view_port);
+    furi_message_queue_free(app->input_queue);
+    furi_mutex_free(app->mutex);
+    furi_record_close(RECORD_NOTIFICATION);
+    free(app);
+}
+
+static void input_callback(InputEvent* input_event, void* ctx) {
+    PassGen* app = ctx;
+    if(input_event->type == InputTypeShort) {
+        furi_message_queue_put(app->input_queue, input_event, 0);
+    }
+}
+
+static void render_callback(Canvas* canvas, void* ctx) {
+    char str_length[8];
+    PassGen* app = ctx;
+    furi_check(furi_mutex_acquire(app->mutex, FuriWaitForever) == FuriStatusOk);
+	
+    canvas_clear(canvas);
+    canvas_draw_box(canvas, 0, 0, 128, 14);
+    canvas_set_color(canvas, ColorWhite);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 2, 11, "Password Generator");
+    
+    canvas_set_color(canvas, ColorBlack);
+	canvas_draw_str_aligned(canvas, 64, 35, AlignCenter, AlignCenter, app->password);
+
+	// Navigation menu:
+    canvas_set_font(canvas, FontSecondary);
+    canvas_draw_icon(canvas, 96, 52, &I_Pin_back_arrow_10x8);
+    canvas_draw_str(canvas, 108, 60, "Exit");
+	
+    canvas_draw_icon(canvas, 54, 52, &I_Vertical_arrow_7x9);
+    canvas_draw_str(canvas, 64, 60, AlphabetLevelNames[app->level]);
+	
+    snprintf(str_length, sizeof(str_length), "Len: %d", app->length);
+    canvas_draw_icon(canvas, 4, 53, &I_Horizontal_arrow_9x7);
+    canvas_draw_str(canvas, 15, 60, str_length);
+	
+    furi_mutex_release(app->mutex);
+}
+
+void build_alphabet(PassGen* app)
+{
+	PassGen_Alphabet mode = AlphabetLevels[app->level];
+	app->alphabet[0] = '\0';
+	if ((mode & Digits) != 0)
+		strcat(app->alphabet, PASSGEN_DIGITS);
+	if ((mode & Lowercase) != 0)
+		strcat(app->alphabet, PASSGEN_LETTERS_LOW);
+	if ((mode & Uppercase) != 0)
+		strcat(app->alphabet, PASSGEN_LETTERS_UP);
+	if ((mode & Special) != 0)
+		strcat(app->alphabet, PASSGEN_SPECIAL);
+}
+
+PassGen* state_init() {
+    PassGen* app = malloc(sizeof(PassGen));
+	app->length = 8;
+	app->level = 2;
+	build_alphabet(app);
+    app->input_queue = furi_message_queue_alloc(8, sizeof(InputEvent));
+    app->view_port = view_port_alloc();
+    app->gui = furi_record_open(RECORD_GUI);
+    app->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
+    view_port_input_callback_set(app->view_port, input_callback, app);
+    view_port_draw_callback_set(app->view_port, render_callback, app);
+    gui_add_view_port(app->gui, app->view_port, GuiLayerFullscreen);
+	
+	app->notify = furi_record_open(RECORD_NOTIFICATION);
+	
+    return app;
+}
+
+void generate(PassGen* app)
+{
+	int hi = strlen(app->alphabet);
+	for (int i=0; i<app->length; i++)
+	{
+		int x = rand() % hi;
+		app->password[i]=app->alphabet[x];
+	}
+	app->password[app->length] = '\0';
+}
+
+void update_password(PassGen* app, bool vibro)
+{
+	generate(app);
+	
+	if (vibro)
+		notification_message(app->notify, &PassGen_Alert_vibro);
+	else
+		notification_message(app->notify, &sequence_blink_blue_100);
+	view_port_update(app->view_port);
+}
+
+int32_t passgenapp(void) {
+    PassGen* app = state_init();
+	generate(app);
+
+    while(1) {
+        InputEvent input;
+        while(furi_message_queue_get(app->input_queue, &input, FuriWaitForever) == FuriStatusOk) {
+            furi_check(furi_mutex_acquire(app->mutex, FuriWaitForever) == FuriStatusOk);
+
+			if (input.type == InputTypeShort)
+			{
+				switch (input.key) {
+				case InputKeyBack:
+					furi_mutex_release(app->mutex);
+					state_free(app);
+					return 0;
+				case InputKeyDown:
+					if (app->level > 0)
+					{
+						app->level--;
+						build_alphabet(app);
+						update_password(app, false);
+					}
+					else
+						notification_message(app->notify, &sequence_blink_red_100);
+					break;
+				case InputKeyUp:
+					if (app->level < AlphabetLevelsCount - 1)
+					{
+						app->level++;
+						build_alphabet(app);
+						update_password(app, false);
+					}
+					else
+						notification_message(app->notify, &sequence_blink_red_100);
+					break;
+				case InputKeyLeft:
+					if (app->length > 1)
+					{
+						app->length--;
+						update_password(app, false);
+					}
+					else
+						notification_message(app->notify, &sequence_blink_red_100);
+					break;
+				case InputKeyRight:
+					if (app->length < PASSGEN_MAX_LENGTH)
+					{
+						app->length++;
+						update_password(app, false);
+					}
+					else
+						notification_message(app->notify, &sequence_blink_red_100);
+					break;
+				case InputKeyOk:
+					update_password(app, true);
+					break;
+				default:
+					break;
+				}
+			}
+            furi_mutex_release(app->mutex);
+        }
+    }
+    state_free(app);
+    return 0;
+}