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Add game_text_format to Pearl.

--- a/pearl.c

+++ b/pearl.c

@@ -1722,12 +1722,38 @@

 static int game_can_format_as_text_now(const game_params *params)

 {

-    return FALSE;

+    return TRUE;

 }

 static char *game_text_format(const game_state *state)

 {

-    return NULL;

+    int w = state->shared->w, h = state->shared->h, cw = 4, ch = 2;

+    int gw = cw*(w-1) + 2, gh = ch*(h-1) + 1, len = gw * gh, r, c, j;

+    char *board = snewn(len + 1, char);

+

+    assert(board);

+    memset(board, ' ', len);

+

+    for (r = 0; r < h; ++r) {

+	for (c = 0; c < w; ++c) {

+	    int i = r*w + c, cell = r*ch*gw + c*cw;

+	    board[cell] = state->shared->clues[i]["+BW"];

+	    if (c < w - 1 && (state->lines[i] & R || state->lines[i+1] & L))

+		memset(board + cell + 1, '-', cw - 1);

+	    if (r < h - 1 && (state->lines[i] & D || state->lines[i+w] & U))

+		for (j = 1; j < ch; ++j) board[cell + j*gw] = '|';

+	    if (c < w - 1 && (state->marks[i] & R || state->marks[i+1] & L))

+		board[cell + cw/2] = 'x';

+	    if (r < h - 1 && (state->marks[i] & D || state->marks[i+w] & U))

+		board[cell + (ch/2 * gw)] = 'x';

+	}

+

+	for (j = 0; j < (r == h - 1 ? 1 : ch); ++j)

+	    board[r*ch*gw + (gw - 1) + j*gw] = '\n';

+    }

+

+    board[len] = '\0';

+    return board;

 }

 struct game_ui {

@@ -2537,7 +2563,7 @@

     dup_game,

     free_game,

     TRUE, solve_game,

-    FALSE, game_can_format_as_text_now, game_text_format,

+    TRUE, game_can_format_as_text_now, game_text_format,

     new_ui,

     free_ui,

     encode_ui,