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`Copy' operation for Mines.

[originally from svn r5868]

--- a/mines.c

+++ b/mines.c

@@ -2174,7 +2174,30 @@

 static char *game_text_format(game_state *state)

 {

-    return NULL;

+    char *ret;

+    int x, y;

+

+    ret = snewn((state->w + 1) * state->h + 1, char);

+    for (y = 0; y < state->h; y++) {

+	for (x = 0; x < state->w; x++) {

+	    int v = state->grid[y*state->w+x];

+	    if (v == 0)

+		v = '-';

+	    else if (v >= 1 && v <= 8)

+		v = '0' + v;

+	    else if (v == -1)

+		v = '*';

+	    else if (v == -2 || v == -3)

+		v = '?';

+	    else if (v >= 64)

+		v = '!';

+	    ret[y * (state->w+1) + x] = v;

+	}

+	ret[y * (state->w+1) + state->w] = '\n';

+    }

+    ret[(state->w + 1) * state->h] = '\0';

+

+    return ret;

 }

 struct game_ui {

@@ -2728,7 +2751,7 @@

     dup_game,

     free_game,

     FALSE, solve_game,

-    FALSE, game_text_format,

+    TRUE, game_text_format,

     new_ui,

     free_ui,

     make_move,