license

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Caleb Denio
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -0,0 +1,6 @@
+all: bin/crossword bin/crossword-ssh
+
+bin/crossword: cmd/main.go puz/*.go game/game.go
+	go build -o $@ ./cmd
+bin/crossword-ssh: ssh/main.go puz/*.go game/game.go
+	go build -o $@ ./ssh

README.md

@@ -1,11 +1,16 @@
+Very silly terminal-based crossword solver. It can play .puz / .ipuz files from a variety of sources, including [Crosshare](https://crosshare.org).
+
+- Requirements: [Go](https://go.dev)
+- Build: `make`
+- Usage: `./bin/crossword <file>.puz`
+
+![demo](demo.gif)
+
+---
+
 todo
 
-- fix bug with that one 6x6 puzzle
-- correctly calculate uiHeight with multi-line clues
 - timer
-- reveal grid/word
 - .puz checksums
-- fix shift+enter in other terminals
-- after entering letter, jump to next unfilled cell (even if it's backwards)
-- tab/shift+tab
-- clear grid
+- fix shift+enter / shift+tab in other terminals
+- rebus

cmd/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bufio"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"log"
@@ -12,6 +13,11 @@ import (
 	"golang.org/x/term"
 )
 
+func getTermWidth() int {
+	w, _, _ := term.GetSize(int(os.Stdin.Fd()))
+	return w
+}
+
 func main() {
 	defer func() {
 		if r := recover(); r != nil {
@@ -20,10 +26,11 @@ func main() {
 	}()
 
 	debugMode := flag.Bool("debug", false, "")
+	dumpMode := flag.Bool("dump", false, "")
 	flag.Parse()
 
 	filename := flag.Arg(0)
-	file, err := os.ReadFile(filename)
+	file, err := os.Open(filename)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -33,11 +40,17 @@ func main() {
 		log.Fatal(err)
 	}
 
-	puzzle, err := puz.ParsePuz(file)
+	puzzle, err := puz.LoadPuzzle(file)
 	if err != nil {
 		log.Fatal(err)
 	}
 
+	if dumpMode != nil && *dumpMode {
+		json.NewEncoder(os.Stdout).Encode(puzzle)
+		fmt.Print("\r\n")
+		return
+	}
+
 	fmt.Print("\x1b[?25l")
 
 	defer func() {
@@ -50,12 +63,7 @@ func main() {
 
 	defer term.Restore(int(os.Stdin.Fd()), termState)
 
-	state := game.State{
-		Puzzle:       puzzle,
-		PuzzleState:  []rune(puzzle.State),
-		SelectedClue: puzzle.Clues[0],
-		SelectedCell: puzzle.Clues[0].Cells[0],
-	}
+	state := game.NewState(puzzle)
 	if debugMode != nil {
 		state.DebugMode = *debugMode
 	}
@@ -69,7 +77,7 @@ func main() {
 		}
 	}
 
-	uiHeight := state.RenderUI(os.Stdout)
+	uiHeight := state.RenderUI(os.Stdout, getTermWidth())
 
 	scanner := bufio.NewScanner(os.Stdin)
 	scanner.Split(func(data []byte, atEOF bool) (advance int, token []byte, err error) {
@@ -103,16 +111,15 @@ func main() {
 			}
 			state.SelectedClue = nil
 			state.SelectedCell = -1
-			state.Goodbye = true
 			fmt.Printf("\r\x1b[%dA", uiHeight)
 			fmt.Print("\x1b[J")
-			state.RenderUI(os.Stdout)
+			state.RenderUI(os.Stdout, getTermWidth())
 			return
 		}
 
 		fmt.Printf("\r\x1b[%dA", uiHeight)
 		fmt.Print("\x1b[J")
 
-		uiHeight = state.RenderUI(os.Stdout)
+		uiHeight = state.RenderUI(os.Stdout, getTermWidth())
 	}
 }

game/game.go

@@ -12,15 +12,90 @@ import (
 	"github.com/cjdenio/crossword/puz"
 )
 
+type SolveState int
+
+const (
+	Unsolved SolveState = iota
+	FilledNotSolved
+	Solved
+)
+
+type UIState int
+
+const (
+	StateGame UIState = iota
+	StateRebusConfirmation
+	StateMenu
+	StateRevealMenu
+	StateCheckMenu
+)
+
 type State struct {
 	Puzzle          *puz.Puzzle
 	PuzzleState     []rune
 	SelectedCell    int
 	SelectedClue    *puz.Clue
-	Goodbye         bool
 	LastKeySequence string
 	DebugMode       bool
-	SolveState      int
+	SolveState      SolveState
+	CheckState      []rune
+	UIState         UIState
+}
+
+func RenderWithLineWrap(s string, width int) (out string, lines int) {
+	builder := strings.Builder{}
+	runes := []rune(s)
+
+	counter := 0
+	lines = 1
+
+	for i := 0; i < len(runes); i++ {
+		char := runes[i]
+
+		if char == '\n' {
+			builder.WriteString("\r\n")
+			lines++
+			counter = 0
+			continue
+		}
+
+		if char == '\r' && i < len(runes)-1 && runes[i+1] == '\n' {
+			builder.WriteString("\r\n")
+			lines++
+			counter = 0
+			i++
+			continue
+		}
+
+		builder.WriteRune(char)
+		counter++
+
+		if counter >= width && i < len(runes)-1 {
+			lines++
+			builder.WriteString("\r\n")
+			counter = 0
+		}
+	}
+
+	builder.WriteString("\r\n")
+
+	out = builder.String()
+	return
+}
+
+func NewState(puzzle *puz.Puzzle) *State {
+	state := StateGame
+	if puzzle.HasRebus {
+		state = StateRebusConfirmation
+	}
+	return &State{
+		Puzzle:       puzzle,
+		PuzzleState:  []rune(puzzle.State),
+		SelectedClue: puzzle.Clues[0],
+		SelectedCell: puzzle.Clues[0].Cells[0],
+		CheckState:   make([]rune, len(puzzle.State)),
+		UIState:      state,
+	}
 }
 
 func (state *State) MoveCursor(direction int) {
@@ -179,7 +254,7 @@ func (state *State) GridFilled() bool {
 	return !slices.Contains(state.PuzzleState, '-')
 }
 
-func (state *State) CheckPuzzle() bool {
+func (state *State) PuzzleSolved() bool {
 	for i, cell := range state.PuzzleState {
 		if cell == '.' {
 			continue
@@ -191,10 +266,59 @@ func (state *State) CheckPuzzle() bool {
 	return true
 }
 
-func (state *State) RenderUI(w io.Writer) int {
-	selectedClueCells := []int{}
-	if state.SelectedClue != nil {
-		selectedClueCells = state.SelectedClue.Cells
+func (state *State) CheckPuzzle() {
+	result := make([]rune, len(state.PuzzleState))
+
+	for i, cell := range state.PuzzleState {
+		if cell == '.' || cell == '-' {
+			continue
+		}
+		if cell == rune(state.Puzzle.Solution[i]) {
+			result[i] = 'y'
+		} else {
+			result[i] = 'n'
+		}
+	}
+
+	state.CheckState = result
+}
+
+func (state *State) CheckWord(clue *puz.Clue) {
+	for i, cellIdx := range clue.Cells {
+		cellState := state.PuzzleState[cellIdx]
+		if cellState == '-' || cellState == '.' {
+			continue
+		}
+
+		if cellState == rune(clue.Solution[i]) {
+			state.CheckState[cellIdx] = 'y'
+		} else {
+			state.CheckState[cellIdx] = 'n'
+		}
+	}
+}
+
+func (state *State) RevealWord(clue *puz.Clue) {
+	for i, cellIdx := range clue.Cells {
+		state.PuzzleState[cellIdx] = rune(clue.Solution[i])
+		state.CheckState[cellIdx] = 'y'
+	}
+}
+
+func (state *State) RevealPuzzle() {
+	for i, cell := range state.PuzzleState {
+		if cell == '.' {
+			continue
+		}
+		state.PuzzleState[i] = rune(state.Puzzle.Solution[i])
+		state.CheckState[i] = 'y'
+	}
+}
+
+func (state *State) RenderUI(w io.Writer, width int) int {
+	if state.UIState == StateRebusConfirmation {
+		fmt.Fprint(w, "This puzzle contains a rebus. This tool does not support rebuses.\r\nPress 'y' to continue anyway, or press any other key to exit.\r\n")
+		return 2
 	}
 
 	uiHeight := 0
@@ -203,24 +327,45 @@ func (state *State) RenderUI(w io.Writer) int {
 	uiHeight += 2
 	fmt.Fprintf(w, "AUTHOR: %s\r\n", state.Puzzle.Author)
 	uiHeight += 1
-	fmt.Fprint(w, RenderPuzzle(state.PuzzleState, state.Puzzle.Width, state.Puzzle.Height, selectedClueCells, state.SelectedCell)+"\r\n")
+	fmt.Fprint(w, state.RenderPuzzle()+"\r\n")
 	uiHeight += state.Puzzle.Height + 3
 	if state.SelectedClue != nil {
+		directionStr := "down"
 		if state.SelectedClue.Direction == puz.DirectionAcross {
-			fmt.Fprintf(w, "%d-across: %s\r\n\r\n", state.SelectedClue.Number, state.SelectedClue.Clue)
-		} else {
-			fmt.Fprintf(w, "%d-down: %s\r\n\r\n", state.SelectedClue.Number, state.SelectedClue.Clue)
+			directionStr = "across"
 		}
+
+		clueStr, clueLines := RenderWithLineWrap(fmt.Sprintf("%d-%s: %s", state.SelectedClue.Number, directionStr, state.SelectedClue.Clue), width)
+		w.Write([]byte(clueStr))
+		uiHeight += clueLines
+		io.WriteString(w, "\r\n")
+		uiHeight += 1
+	}
+	if state.Puzzle.Copyright != "" {
+		fmt.Fprintf(w, "%s\r\n\r\n", state.Puzzle.Copyright)
 		uiHeight += 2
 	}
-	fmt.Fprintf(w, "%s\r\n", state.Puzzle.Copyright)
+
+	switch state.UIState {
+	case StateGame:
+		fmt.Fprint(w, AnsiDimmed("[enter]/[tab]: next word | [ctrl+a]: menu | [ctrl+c]: exit\r\n"))
 		uiHeight += 1
+	case StateMenu:
+		fmt.Fprint(w, AnsiDimmed("[c]: check puzzle/word | [r]: reveal puzzle/word | [x]: clear grid | [q]: exit menu\r\n"))
+		uiHeight += 1
+	case StateCheckMenu:
+		fmt.Fprint(w, AnsiDimmed("[w]: check word | [p]: check puzzle | [q]: exit menu\r\n"))
+		uiHeight += 1
+	case StateRevealMenu:
+		fmt.Fprint(w, AnsiDimmed("[w]: reveal word | [p]: reveal puzzle | [q]: exit menu\r\n"))
+		uiHeight += 1
+	}
 
 	switch state.SolveState {
-	case 1:
+	case FilledNotSolved:
 		fmt.Fprintf(w, "\r\n%s\r\n", AnsiRed("The puzzle was filled, but at least 1 letter is incorrect..."))
 		uiHeight += 2
-	case 2:
+	case Solved:
 		fmt.Fprintf(w, "\r\n%s\r\n", AnsiGreen("The puzzle was solved!"))
 		uiHeight += 2
 	}
@@ -230,11 +375,6 @@ func (state *State) RenderUI(w io.Writer) int {
 		uiHeight += 2
 	}
 
-	if state.Goodbye {
-		fmt.Fprint(w, "\r\nsee ya\r\n")
-		uiHeight += 2
-	}
-
 	return uiHeight
 }
 
@@ -260,17 +400,22 @@ func AnsiRed(s string) string {
 	return fmt.Sprintf("\x1b[31m%s\x1b[0m", s)
 }
 
-func RenderPuzzle(puzzle []rune, width, height int, selectedClueCells []int, selectedCell int) string {
+func (state *State) RenderPuzzle() string {
+	selectedClueCells := []int{}
+	if state.SelectedClue != nil {
+		selectedClueCells = state.SelectedClue.Cells
+	}
+
 	b := strings.Builder{}
 
 	b.WriteRune('┌')
-	for range (width * 2) + 1 {
+	for range (state.Puzzle.Width * 2) + 1 {
 		b.WriteRune('─')
 	}
 	b.WriteString("┐\r\n")
 
-	for index, char := range puzzle {
-		if index%width == 0 {
+	for index, char := range state.PuzzleState {
+		if index%state.Puzzle.Width == 0 {
 			b.WriteString("│ ")
 		}
 
@@ -284,17 +429,26 @@ func RenderPuzzle(puzzle []rune, width, height int, selectedClueCells []int, sel
 			cell = string(char)
 		}
 
-		if selectedCell == index {
+		if state.SelectedCell == index {
 			cell = AnsiInverted(cell)
 		} else if slices.Contains(selectedClueCells, index) {
 			cell = AnsiWhiteBackgrounded(cell)
 		}
 
+		if len(state.CheckState) == len(state.PuzzleState) {
+			switch state.CheckState[index] {
+			case 'y':
+				cell = AnsiGreen(cell)
+			case 'n':
+				cell = AnsiRed(cell)
+			}
+		}
+
 		b.WriteString(cell)
 
-		if (index+1)%width == 0 {
+		if (index+1)%state.Puzzle.Width == 0 {
 			b.WriteString(" │\r\n")
-		} else if char == '.' && puzzle[index+1] == '.' {
+		} else if char == '.' && state.PuzzleState[index+1] == '.' {
 			b.WriteRune(0x2588)
 		} else {
 			// inefficient
@@ -307,7 +461,7 @@ func RenderPuzzle(puzzle []rune, width, height int, selectedClueCells []int, sel
 	}
 
 	b.WriteRune('└')
-	for range (width * 2) + 1 {
+	for range (state.Puzzle.Width * 2) + 1 {
 		b.WriteRune('─')
 	}
 	b.WriteString("┘\r\n")
@@ -348,6 +502,32 @@ func (state *State) LoadSaveFile(f []byte) error {
 	return nil
 }
 
+func (state *State) SwitchDirections() bool {
+	switch state.SelectedClue.Direction {
+	case puz.DirectionAcross:
+		if state.Puzzle.Cells[state.SelectedCell][1] != nil {
+			state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][1]
+		}
+		return true
+	case puz.DirectionDown:
+		if state.Puzzle.Cells[state.SelectedCell][0] != nil {
+			state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][0]
+		}
+		return true
+	}
+
+	return false
+}
+
+func (state *State) ClearGrid() {
+	for i, cell := range state.PuzzleState {
+		if cell != '.' {
+			state.PuzzleState[i] = '-'
+			state.CheckState[i] = '\x00'
+		}
+	}
+}
+
 func (state *State) HandleInput(buffer []byte) (exited bool) {
 	if len(buffer) == 0 {
 		return false
@@ -359,28 +539,67 @@ func (state *State) HandleInput(buffer []byte) (exited bool) {
 		return true
 	}
 
+	switch state.UIState {
+	case StateRebusConfirmation:
+		if buffer[0] == 'y' {
+			state.UIState = StateGame
+			return false
+		} else {
+			return true
+		}
+	case StateMenu:
+		switch buffer[0] {
+		case 'c':
+			state.UIState = StateCheckMenu
+		case 'r':
+			state.UIState = StateRevealMenu
+		case 'x':
+			state.ClearGrid()
+			state.UIState = StateGame
+		default:
+			state.UIState = StateGame
+		}
+		return false
+	case StateCheckMenu:
+		switch buffer[0] {
+		case 'w':
+			state.CheckWord(state.SelectedClue)
+		case 'p':
+			state.CheckPuzzle()
+		}
+		state.UIState = StateGame
+		return false
+	case StateRevealMenu:
+		switch buffer[0] {
+		case 'w':
+			state.RevealWord(state.SelectedClue)
+		case 'p':
+			state.RevealPuzzle()
+			return true
+		}
+		state.UIState = StateGame
+		return false
+	}
+
+	if buffer[0] == '\x01' {
+		state.UIState = StateMenu
+		return false
+	}
+
 	if buffer[0] == ' ' {
-		switch state.SelectedClue.Direction {
-		case puz.DirectionAcross:
-			if state.Puzzle.Cells[state.SelectedCell][1] != nil {
-				state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][1]
-			}
-		case puz.DirectionDown:
-			if state.Puzzle.Cells[state.SelectedCell][0] != nil {
-				state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][0]
-			}
-		}
+		state.SwitchDirections()
 	}
 
 	if buffer[0] >= 0x61 && buffer[0] <= 0x7a {
 		cellWasFilled := state.PuzzleState[state.SelectedCell] != '-'
 		state.PuzzleState[state.SelectedCell] = unicode.ToUpper(rune(buffer[0]))
+		state.CheckState[state.SelectedCell] = 0x00
 
 		i := slices.Index(state.SelectedClue.Cells, state.SelectedCell)
 
 		if !cellWasFilled {
 			// jump to next unfilled cell in clue
-			for x := i + 1; x < len(state.SelectedClue.Cells); x++ {
+			for x := (i + 1) % len(state.SelectedClue.Cells); x != i; x = ((x + 1) % len(state.SelectedClue.Cells)) {
 				if state.PuzzleState[state.SelectedClue.Cells[x]] == '-' {
 					state.SelectedCell = state.SelectedClue.Cells[x]
 					break
@@ -394,13 +613,14 @@ func (state *State) HandleInput(buffer []byte) (exited bool) {
 		}
 
 		if state.GridFilled() {
-			if state.CheckPuzzle() {
-				state.SolveState = 2
+			if state.PuzzleSolved() {
+				state.SolveState = Solved
+				return true
 			} else {
-				state.SolveState = 1
+				state.SolveState = FilledNotSolved
 			}
 		} else {
-			state.SolveState = 0
+			state.SolveState = Unsolved
 		}
 	}
 
@@ -417,7 +637,7 @@ func (state *State) HandleInput(buffer []byte) (exited bool) {
 		}
 	}
 
-	if buffer[0] == '\r' {
+	if buffer[0] == '\r' || buffer[0] == '\t' {
 		state.NextWord()
 	}
 	if buffer[0] == '~' {
@@ -426,9 +646,9 @@ func (state *State) HandleInput(buffer []byte) (exited bool) {
 
 	if string(buffer[0:2]) == "\x1b[" {
 		if (buffer[2] == 68 || buffer[2] == 67) && state.SelectedClue != nil && state.SelectedClue.Direction == puz.DirectionDown {
-			state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][0]
+			state.SwitchDirections()
 		} else if (buffer[2] == 65 || buffer[2] == 66) && state.SelectedClue != nil && state.SelectedClue.Direction == puz.DirectionAcross {
-			state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][1]
+			state.SwitchDirections()
 		} else {
 			switch buffer[2] {
 			case 68: // left
@@ -443,10 +663,18 @@ func (state *State) HandleInput(buffer []byte) (exited bool) {
 
 			switch state.SelectedClue.Direction {
 			case puz.DirectionAcross:
+				if state.Puzzle.Cells[state.SelectedCell][0] != nil {
 					state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][0]
-			case puz.DirectionDown:
+				} else {
 					state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][1]
 				}
+			case puz.DirectionDown:
+				if state.Puzzle.Cells[state.SelectedCell][1] != nil {
+					state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][1]
+				} else {
+					state.SelectedClue = state.Puzzle.Cells[state.SelectedCell][0]
+				}
+			}
 		}
 	}
 	return false

puz/ipuz.go

@@ -0,0 +1,183 @@
+package puz
+
+import (
+	"encoding/json"
+	"errors"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+type iPuzDimensions struct {
+	Width  int `json:"width"`
+	Height int `json:"height"`
+}
+type iPuzClue struct {
+	Number int    `json:"number"`
+	Clue   string `json:"clue"`
+}
+type iPuzFile struct {
+	Kind       []string              `json:"kind"`
+	Title      string                `json:"title"`
+	Author     string                `json:"author"`
+	Copyright  string                `json:"copyright"`
+	Puzzle     [][]any               `json:"puzzle"`
+	Solution   [][]string            `json:"solution"`
+	Dimensions iPuzDimensions        `json:"dimensions"`
+	Clues      map[string][]iPuzClue `json:"clues"`
+}
+
+func unwrapCell(cell any) (any, error) {
+	switch c := cell.(type) {
+	case string:
+		if c == "#" {
+			return "#", nil
+		} else if i, err := strconv.Atoi(c); err == nil {
+			return i, nil
+		} else {
+			return nil, errors.New("invalid string")
+		}
+	case float64:
+		return int(c), nil
+	case map[string]any:
+		if unwrappedCell, ok := c["cell"]; ok {
+			return unwrapCell(unwrappedCell) // recursion babyyyyyy
+		}
+	}
+
+	return nil, errors.New("unknown type")
+}
+
+func ParseIPuz(file []byte) (*Puzzle, error) {
+	var parsed iPuzFile
+	err := json.Unmarshal(file, &parsed)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(parsed.Kind) == 0 || !slices.ContainsFunc(parsed.Kind, func(k string) bool {
+		return strings.HasPrefix(k, "http://ipuz.org/crossword")
+	}) {
+		return nil, errors.New("ipuz file is not a crossword")
+	}
+
+	puzzle := new(Puzzle)
+
+	puzzle.RebusCells = make(map[int]string)
+
+	puzzle.Title = parsed.Title
+	puzzle.Author = parsed.Author
+	puzzle.Copyright = parsed.Copyright
+
+	puzzle.Width = parsed.Dimensions.Width
+	puzzle.Height = parsed.Dimensions.Height
+
+	puzzle.ClueCount = len(parsed.Clues["Across"]) + len(parsed.Clues["Down"])
+
+	clueToCellMap := make(map[int][2]int)
+
+	state := strings.Builder{}
+	for y, row := range parsed.Puzzle {
+		for x, cell := range row {
+			unwrappedCell, err := unwrapCell(cell)
+			if err != nil {
+				return nil, err
+			}
+			switch c := unwrappedCell.(type) {
+			case string:
+				state.WriteRune('.')
+			case int:
+				clueToCellMap[c] = [2]int{x, y}
+				state.WriteRune('-')
+			default:
+				return nil, errors.New("unexpected type in .ipuz file")
+			}
+		}
+	}
+	puzzle.State = state.String()
+
+	solution := strings.Builder{}
+	for y, row := range parsed.Solution {
+		for x, cell := range row {
+			if cell == "#" {
+				solution.WriteRune('.')
+			} else if len(cell) > 1 {
+				solution.WriteByte(cell[0])
+				puzzle.RebusCells[y*puzzle.Width+x] = cell
+				puzzle.HasRebus = true
+			} else if len(cell) == 1 {
+				solution.WriteString(cell)
+			} else {
+				return nil, errors.New("invalid ipuz file")
+			}
+		}
+	}
+	puzzle.Solution = solution.String()
+
+	puzzle.Clues = make([]*Clue, 0, puzzle.ClueCount)
+	puzzle.Cells = make([][2]*Clue, puzzle.Width*puzzle.Height)
+
+	for _, clue := range parsed.Clues["Across"] {
+		cellCoords := clueToCellMap[clue.Number]
+
+		clueCells := make([]int, 0)
+		clueSolution := strings.Builder{}
+
+		clueStruct := &Clue{
+			Clue:      clue.Clue,
+			Direction: DirectionAcross,
+			Number:    clue.Number,
+		}
+
+		for i := cellCoords[0]; i < puzzle.Width; i++ {
+			cell := parsed.Solution[cellCoords[1]][i]
+			if cell == "#" {
+				break
+			}
+
+			cellIdx := cellCoords[1]*puzzle.Width + i
+
+			clueCells = append(clueCells, cellIdx)
+			puzzle.Cells[cellIdx][0] = clueStruct
+			clueSolution.WriteByte(cell[0])
+		}
+
+		clueStruct.Solution = clueSolution.String()
+		clueStruct.Cells = clueCells
+
+		puzzle.Clues = append(puzzle.Clues, clueStruct)
+	}
+
+	for _, clue := range parsed.Clues["Down"] {
+		cellCoords := clueToCellMap[clue.Number]
+
+		clueCells := make([]int, 0)
+		clueSolution := strings.Builder{}
+
+		clueStruct := &Clue{
+			Clue:      clue.Clue,
+			Direction: DirectionDown,
+			Number:    clue.Number,
+		}
+
+		for i := cellCoords[1]; i < puzzle.Height; i++ {
+			cell := parsed.Solution[i][cellCoords[0]]
+			if cell == "#" {
+				break
+			}
+
+			cellIdx := i*puzzle.Width + cellCoords[0]
+
+			clueCells = append(clueCells, cellIdx)
+			puzzle.Cells[cellIdx][1] = clueStruct
+			clueSolution.WriteByte(cell[0])
+		}
+
+		clueStruct.Solution = clueSolution.String()
+		clueStruct.Cells = clueCells
+
+		puzzle.Clues = append(puzzle.Clues, clueStruct)
+	}
+
+	return puzzle, nil
+}

puz/puz.go

@@ -5,44 +5,15 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"io"
 	"math"
+	"regexp"
+	"strconv"
 	"strings"
 
 	"golang.org/x/text/encoding/charmap"
 )
 
-type Direction int
-
-const (
-	DirectionAcross Direction = iota
-	DirectionDown
-)
-
-type Clue struct {
-	Clue      string
-	Solution  string
-	Cells     []int
-	Direction Direction
-	Number    int
-}
-
-type Puzzle struct {
-	ClueCount int
-	Width     int
-	Height    int
-
-	Title     string
-	Author    string
-	Copyright string
-
-	Solution string
-	State    string
-
-	Clues []*Clue
-
-	Cells [][2]*Clue
-}
-
 func startOfDownClue(puzzle string, width, height, index int) bool {
 	if puzzle[index] == '.' {
 		return false
@@ -75,60 +46,160 @@ func startOfAcrossClue(puzzle string, width, index int) bool {
 	return false
 }
 
-func readText(b *bufio.Reader) (string, error) {
+func readText(b *bufio.Reader, version string) (string, error) {
 	text, err := b.ReadString(0x00)
 	if err != nil {
 		return "", err
 	}
 
+	if version == "1" {
 		decoded, err := charmap.ISO8859_1.NewDecoder().String(text[:len(text)-1])
 		if err != nil {
 			return "", err
 		}
 
-	return decoded, nil
+		return strings.TrimSpace(decoded), nil
+	} else {
+		return strings.TrimSpace(string(text[:len(text)-1])), nil
+	}
+}
+
+type ExtraBlock struct {
+	Name string
+	Data []byte
+}
+
+func readExtraBlock(r *bufio.Reader) (*ExtraBlock, error) {
+	name := make([]byte, 4)
+	_, err := r.Read(name)
+	if err != nil {
+		return nil, err
+	}
+
+	length := make([]byte, 2)
+	_, err = r.Read(length)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = r.Discard(2)
+	if err != nil {
+		return nil, err
+	}
+
+	data := make([]byte, binary.LittleEndian.Uint16(length))
+	_, err = r.Read(data)
+	if err != nil {
+		return nil, err
+	}
+
+	// consume trailing null byte
+	_, err = r.Discard(1)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ExtraBlock{
+		Name: string(name),
+		Data: data,
+	}, nil
 }
 
 func ParsePuz(file []byte) (*Puzzle, error) {
+	r := bytes.NewReader(file)
+
+	_, err := r.Seek(2, io.SeekStart) // consume the checksum
+	if err != nil {
+		return nil, err
+	}
+
 	// read magic bytes
-	magic := string(file[2:14])
-	if magic != "ACROSS&DOWN\x00" {
+	magic := make([]byte, 12)
+	_, err = r.Read(magic)
+	if err != nil {
+		return nil, err
+	}
+	if !bytes.Equal(magic, []byte("ACROSS&DOWN\x00")) {
 		return nil, errors.New("not a valid .puz file")
 	}
 
 	puzzle := new(Puzzle)
 
+	puzzle.RebusCells = make(map[int]string)
+
+	_, err = r.Seek(10, io.SeekCurrent)
+	if err != nil {
+		return nil, err
+	}
+
 	// read header
-	puzzle.Width = int(file[0x2C])
-	puzzle.Height = int(file[0x2D])
-	puzzle.ClueCount = int(binary.LittleEndian.Uint16(file[0x2E:0x30]))
+	version := make([]byte, 4)
+	_, err = r.Read(version)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = r.Seek(16, io.SeekCurrent)
+	if err != nil {
+		return nil, err
+	}
+
+	width, err := r.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+	height, err := r.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+
+	puzzle.Width = int(width)
+	puzzle.Height = int(height)
+
+	clueCount := make([]byte, 2)
+	_, err = r.Read(clueCount)
+	if err != nil {
+		return nil, err
+	}
+	puzzle.ClueCount = int(binary.LittleEndian.Uint16(clueCount))
 
 	puzzleSize := puzzle.Width * puzzle.Height
-	solutionStart := 0x34
-	solutionEnd := 0x34 + puzzleSize
 
-	stateStart := solutionEnd
-	stateEnd := stateStart + puzzleSize
+	_, err = r.Seek(4, io.SeekCurrent)
+	if err != nil {
+		return nil, err
+	}
 
-	puzzle.Solution = string(file[solutionStart:solutionEnd])
-	puzzle.State = string(file[stateStart:stateEnd])
+	solution := make([]byte, puzzleSize)
+	_, err = r.Read(solution)
+	if err != nil {
+		return nil, err
+	}
+	state := make([]byte, puzzleSize)
+	_, err = r.Read(state)
+	if err != nil {
+		return nil, err
+	}
 
-	// read text
-	buf := bufio.NewReader(bytes.NewReader(file[stateEnd:]))
+	puzzle.Solution = string(solution)
+	puzzle.State = string(state)
 
-	title, err := readText(buf)
+	// read text fields
+	buf := bufio.NewReader(r)
+
+	title, err := readText(buf, string(version[0]))
 	if err != nil {
 		return nil, err
 	}
 	puzzle.Title = title
 
-	author, err := readText(buf)
+	author, err := readText(buf, string(version[0]))
 	if err != nil {
 		return nil, err
 	}
 	puzzle.Author = author
 
-	copyright, err := readText(buf)
+	copyright, err := readText(buf, string(version[0]))
 	if err != nil {
 		return nil, err
 	}
@@ -137,13 +208,55 @@ func ParsePuz(file []byte) (*Puzzle, error) {
 	// read clues
 	clues := make([]string, 0, puzzle.ClueCount)
 	for range puzzle.ClueCount {
-		clue, err := readText(buf)
+		clue, err := readText(buf, string(version[0]))
 		if err != nil {
 			return nil, err
 		}
 		clues = append(clues, clue)
 	}
 
+	// read the "note" field, currently unused
+	_, err = readText(buf, string(version[0]))
+	if err != nil {
+		return nil, err
+	}
+
+	extraBlocks := make(map[string]*ExtraBlock)
+
+	for {
+		extra, err := readExtraBlock(buf)
+		if errors.Is(err, io.EOF) {
+			break
+		} else if err != nil {
+			return nil, err
+		}
+		extraBlocks[extra.Name] = extra
+	}
+
+	grbs, grbsOk := extraBlocks["GRBS"]
+	trbl, trblOk := extraBlocks["RTBL"]
+	if grbsOk && trblOk {
+		puzzle.HasRebus = true
+		rebusCellMap := make(map[int][]int)
+		for i, b := range grbs.Data {
+			if b > 0 {
+				rebusCellMap[int(b)-1] = append(rebusCellMap[int(b)-1], i)
+			}
+		}
+
+		rebusData := regexp.MustCompile(`\s*(\d+):(\w+);\s*`).FindAllStringSubmatch(string(trbl.Data), -1)
+		for _, rebus := range rebusData {
+			cell, err := strconv.Atoi(rebus[1])
+			if err != nil {
+				continue
+			}
+
+			for _, c := range rebusCellMap[cell] {
+				puzzle.RebusCells[c] = rebus[2]
+			}
+		}
+	}
+
 	// assign clue numbers
 	puzzle.Clues = make([]*Clue, 0, puzzle.ClueCount)
 	puzzle.Cells = make([][2]*Clue, len(puzzle.Solution))

puz/shared.go

@@ -0,0 +1,67 @@
+package puz
+
+import (
+	"bufio"
+	"errors"
+	"io"
+)
+
+type Direction int
+
+const (
+	DirectionAcross Direction = iota
+	DirectionDown
+)
+
+type Clue struct {
+	Clue      string
+	Solution  string
+	Cells     []int
+	Direction Direction
+	Number    int
+}
+
+type Puzzle struct {
+	ClueCount int
+	Width     int
+	Height    int
+
+	Title     string
+	Author    string
+	Copyright string
+
+	Solution string
+	State    string
+
+	Clues []*Clue
+
+	Cells [][2]*Clue
+
+	HasRebus bool
+
+	RebusCells map[int]string
+}
+
+func LoadPuzzle(r io.Reader) (*Puzzle, error) {
+	bufReader := bufio.NewReader(r)
+	header, err := bufReader.Peek(16)
+	if err != nil {
+		return nil, err
+	}
+
+	if string(header[2:14]) == "ACROSS&DOWN\x00" {
+		file, err := io.ReadAll(bufReader)
+		if err != nil {
+			return nil, err
+		}
+		return ParsePuz(file)
+	} else if header[0] == '{' {
+		file, err := io.ReadAll(bufReader)
+		if err != nil {
+			return nil, err
+		}
+		return ParseIPuz(file)
+	} else {
+		return nil, errors.New("could not detect file type")
+	}
+}

ssh/main.go

@@ -13,22 +13,25 @@ import (
 )
 
 func main() {
-	ssh.Handle(func(s ssh.Session) {
 	file, err := os.ReadFile(os.Args[1])
 	if err != nil {
 		log.Fatal(err)
 	}
+
+	port := ":2222"
+	if portEnv, ok := os.LookupEnv("PORT"); ok && portEnv != "" {
+		port = ":" + portEnv
+	}
+
+	ssh.Handle(func(s ssh.Session) {
+		log.Printf("new connection from %s (username %s)\n", s.RemoteAddr().String(), s.User())
+
 		puzzle, err := puz.ParsePuz(file)
 		if err != nil {
 			log.Fatal(err)
 		}
 
-		state := game.State{
-			Puzzle:       puzzle,
-			PuzzleState:  []rune(puzzle.State),
-			SelectedClue: puzzle.Clues[0],
-			SelectedCell: puzzle.Clues[0].Cells[0],
-		}
+		state := game.NewState(puzzle)
 
 		io.WriteString(s, "\x1b[?25l")
 
@@ -36,7 +39,20 @@ func main() {
 			io.WriteString(s, "\x1b[?25h")
 		}()
 
-		uiHeight := state.RenderUI(s)
+		pty, winCh, isPty := s.Pty()
+		if !isPty {
+			return
+		}
+
+		windowWidth := pty.Window.Width
+
+		uiHeight := state.RenderUI(s, windowWidth)
+
+		go func() {
+			for window := range winCh {
+				windowWidth = window.Width
+			}
+		}()
 
 		scanner := bufio.NewScanner(s)
 		scanner.Split(func(data []byte, atEOF bool) (advance int, token []byte, err error) {
@@ -56,25 +72,30 @@ func main() {
 		})
 
 		for {
-			scanner.Scan()
+			ok := scanner.Scan()
+			if !ok {
+				break
+			}
 			buffer := scanner.Bytes()
 
 			exited := state.HandleInput(buffer)
 			if exited {
 				state.SelectedClue = nil
 				state.SelectedCell = -1
-				state.Goodbye = true
 				fmt.Fprintf(s, "\r\x1b[%dA", uiHeight)
 				fmt.Fprint(s, "\x1b[J")
-				state.RenderUI(s)
-				return
+				state.RenderUI(s, windowWidth)
+				break
 			}
 
 			fmt.Fprintf(s, "\r\x1b[%dA", uiHeight)
 			fmt.Fprint(s, "\x1b[J")
 
-			uiHeight = state.RenderUI(s)
+			uiHeight = state.RenderUI(s, windowWidth)
 		}
+
+		log.Printf("%s disconnected\n", s.RemoteAddr().String())
 	})
-	log.Fatal(ssh.ListenAndServe(":1234", nil))
+	log.Printf("starting on port %s...\n", port)
+	log.Fatal(ssh.ListenAndServe(port, nil))
 }