Create simple word encoding scheme and display in game

src/global.gd

@@ -65,3 +65,70 @@ func is_valid_word(word: String) -> bool:
 func _notification(what: int) -> void:
 	if what == NOTIFICATION_WM_CLOSE_REQUEST:
 		get_tree().quit()
+
+
+## Returns the number of 1 bits in an integer
+func popcnt(num: int) -> int:
+	# Is this already implemented somewhere?
+	var count := 0
+	for i in range(64):
+		if num & (1 << i):
+			count += 1
+	return count
+
+
+## Encodes a word using a very basic "encryption" method. Returns -1 if invalid word
+func encode_word(word: String) -> int:
+	if word.length() != 5:
+		return -1
+	word = word.to_upper()
+
+	# Encode word in base 26
+	var num := 0
+	for i in range(word.length()):
+		var letter_ind := word[i].unicode_at(0) - 65 # 65 = ascii "A"
+		if letter_ind < 0 or letter_ind >= 26:
+			return -1
+		num += letter_ind * (26 ** i)
+	# Add an offset so that "aaaaa" isn't just zeroes
+	num += 123456
+
+	# Shuffle bits around
+	# uvwxyz -> vuxwzy -> zyvuxw
+	num = ((num & 0xf0f0f0) >> 4) | ((num & 0x0f0f0f) << 4)
+	num = ((num & 0xffff00) >> 8) | ((num & 0x0000ff) << 16)
+	# Count bits and add as checksum
+	var bits := popcnt(num)
+	num = num | (bits << 24)
+
+	return num
+
+
+## Decodes an encoded word. Returns an empty string if invalid
+func decode_word(encoded_word: int) -> String:
+	var bits := encoded_word >> 24
+	var num := encoded_word & 0xffffff
+
+	# Verify bit count
+	if popcnt(num) != bits:
+		return ""
+
+	# Unshuffle bits
+	num = ((num << 8) & 0xffff00) | ((num >> 16) & 0x0000ff)
+	num = ((num << 4) & 0xf0f0f0) | ((num >> 4) & 0x0f0f0f)
+
+	num -= 123456
+
+	if num < 0 or num >= (26 ** 5): # (26 ** 5) - 1 = "zzzzz"
+		# Someone is trying to be sneaky! Or more likely I just messed up.
+		return ""
+
+	# Decode base 26 word
+	var word := ""
+	for i in range(5):
+		var letter_ind := num % 26
+		word += char(letter_ind + 65) # 65 = ascii "A"
+		@warning_ignore("integer_division")
+		num = num / 26
+
+	return word

src/main.gd

@@ -21,6 +21,7 @@ var won: bool
 var input_guess: String
 
 @onready var title: Label = %Title
+@onready var subtitle: Label = %Subtitle
 @onready var letter_grid: GridContainer = %LetterGrid
 @onready var info_text: Label = %InfoText
 
@@ -54,6 +55,7 @@ func _ready() -> void:
 		random_seed = Time.get_unix_time_from_datetime_dict(current_time)
 
 		title.text = "Daily " + title.text
+		subtitle.text = "%d-%02d-%02d" % [current_time["year"], current_time["month"], current_time["day"]]
 	else:
 		title.text = "Random " + title.text
 
@@ -62,6 +64,9 @@ func _ready() -> void:
 	ended = false
 	won = false
 
+	if not Global.daily_mode:
+		subtitle.text = String.num_int64(Global.encode_word(target_word), 16)
+
 	for i in range(0, 26):
 		var letter := char("A".unicode_at(0) + i)
 		var keyboard_button: Button = keyboard_vbox.find_child("Button" + letter)
@@ -219,14 +224,14 @@ func _on_ButtonBksp_pressed() -> void:
 
 
 func _on_share_button_pressed() -> void:
-	var text := title.text
+	var text := "%s %s\n" % [title.text, subtitle.text]
 	if won:
-		text += " %d/%d\n\n" % [current_guess, guess_count]
+		text += "%d/%d\n\n" % [current_guess, guess_count]
 	elif ended:
-		text += " X/%d\n\n" % [guess_count]
+		text += "X/%d\n\n" % [guess_count]
 	else:
 		# Can probably bail early but I might as allow it
-		text += " ?/%d\n\n" % [guess_count]
+		text += "?/%d\n\n" % [guess_count]
 
 	for i in range(current_guess):
 		for j in range(letter_count):

src/main.tscn

@@ -175,7 +175,11 @@ anchor_bottom = 1.0
 layout_mode = 2
 theme_override_constants/separation = 20
 
-[node name="Title" type="Label" parent="C/V"]
+[node name="Header" type="VBoxContainer" parent="C/V"]
+layout_mode = 2
+theme_override_constants/separation = 0
+
+[node name="Title" type="Label" parent="C/V/Header"]
 unique_name_in_owner = true
 layout_mode = 2
 theme_override_fonts/font = SubResource("1")
@@ -183,6 +187,12 @@ text = "Gordle"
 label_settings = SubResource("LabelSettings_h2dux")
 horizontal_alignment = 1
 
+[node name="Subtitle" type="Label" parent="C/V/Header"]
+unique_name_in_owner = true
+layout_mode = 2
+text = "Subtitle"
+horizontal_alignment = 1
+
 [node name="LetterGrid" type="GridContainer" parent="C/V"]
 unique_name_in_owner = true
 layout_mode = 2
@@ -403,6 +413,7 @@ text = "Guess"
 
 [node name="ShareButton" type="Button" parent="C/V/KeyboardVBox/GuessButton"]
 unique_name_in_owner = true
+layout_mode = 0
 offset_left = 180.0
 offset_right = 283.0
 offset_bottom = 49.0
@@ -411,6 +422,7 @@ text = "Share"
 
 [node name="CopiedText" type="Label" parent="C/V/KeyboardVBox/GuessButton"]
 modulate = Color(1, 1, 1, 0)
+layout_mode = 0
 offset_left = 126.0
 offset_top = 31.0
 offset_right = 347.0