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guess: Much more efficient keyboard interface

Now rather than mucking around with the cursor keys, you can just type a
four-digit number and press Enter.  Of course, if you still want to muck
around with the cursor keys they work the same as before.

Since Backspace was already assigned to clear the peg under the cursor,
I haven't co-opted it for the obvious action of clearing the peg to the
left of the cursor and moving the cursor left.  The left arrow key is a
reasonable alternative anyway.

For consistency, 'L' now labels the pegs with numbers rather than
letters, and is documented.

--- a/guess.c

+++ b/guess.c

@@ -414,7 +414,7 @@

     int drag_col, drag_x, drag_y; /* x and y are *center* of peg! */

     int drag_opeg; /* peg index, if dragged from a peg (from current guess), otherwise -1 */

-    bool show_labels;                   /* label the colours with letters */

+    bool show_labels;                   /* label the colours with numbers */

     pegrow hint;

 };

@@ -900,6 +900,16 @@

             set_peg(&from->params, ui, ui->peg_cur, ui->colour_cur+1);

             ret = UI_UPDATE;

         }

+    } else if (((button >= '1' && button <= '0' + from->params.ncolours) ||

+                (button == '0' && from->params.ncolours == 10)) &&

+               ui->peg_cur < from->params.npegs) {

+        ui->display_cur = true;

+        /* Number keys insert a peg and advance the cursor. */

+        set_peg(&from->params, ui, ui->peg_cur,

+                button == '0' ? 10 : button - '0');

+        if (ui->peg_cur + 1 < from->params.npegs + ui->markable)

+            ui->peg_cur++;

+        ret = UI_UPDATE;

     } else if (button == 'D' || button == 'd' || button == '\b') {

         ui->display_cur = true;

         set_peg(&from->params, ui, ui->peg_cur, 0);

@@ -1196,7 +1206,7 @@

     if (labelled && col) {

         char buf[2];

-        buf[0] = 'a'-1 + col;

+        buf[0] = '0' + (col % 10);

         buf[1] = '\0';

         draw_text(dr, cx+PEGRAD, cy+PEGRAD, FONT_VARIABLE, PEGRAD,

                   ALIGN_HCENTRE|ALIGN_VCENTRE, COL_FRAME, buf);

--- a/puzzles.but

+++ b/puzzles.but

@@ -1339,6 +1339,11 @@

 selected colour in the chosen position. \q{D} or Backspace removes a

 peg, and Space adds a hold marker.

+The number keys can also be used to insert pegs: \q{1} inserts the

+top-most colour, \q{2} the second one, and so forth.  These also

+move the peg cursor to the right.  Pressing \q{L} will label the

+pegs with their numbers.

+

 Pressing \q{h} or \q{?} will fill the current guess with a suggested

 guess.  Using this is not recommended for 10 or more pegs as it is

 slow.