differentiate foundation from placeholder

alternative designs:
╭╌╌╌╮╭╌╌╌╮╭╌╌╌╮
╎ ╳ ╎╎▕▔▏╎╎▛▀▜╎
╎╱‾╲╎╎▕▔▏╎╎▛▀▜╎
╰╌╌╌╯╰╌╌╌╯╰╌╌╌╯

README.md

@@ -40,14 +40,12 @@ licensing details, see `LICENSE`.
  * TODO: visbell changes: instead of screen, flash active {cursor,card} {red,twice}?
  * TODO: differential drawing mode (at least for highlighting cards)
  * TODO: `.` command (repeat last action)
- * TODO: FreeCell (/u/CFWhitman) - req' algorithm for moving multiple cards around
-         for first multicardmove impl.: allow moving (n+1) cards where n is empty spaces
 ### P4
  * TODO: ellipsis overlap: if more than three cards in a row overlap, replace
          middle ones with an ellipsis
  * TODO: differentiate foundation placeholder from cells ph. (freecell)
  * TODO: mouse mode improvements:
-          - spider: detect how many cards to move to empty pile
+          - spider/freecell: detect how many cards to move to empty pile
             (must find exact position despite `extreme_overlap`)
  * TODO: scores, variants: draw 3, max. n overturns
  * TODO: vt220 mode (problems: charset, slow baudrate and no differential drawing mode)

schemes.h

@@ -10,12 +10,14 @@ struct scheme {
 	char** card[_NUM_CARDS_internal];
 	char** facedown;
 	char** placeholder;
+	char** foundation;
 	char** halfstack; /* left half of stack (for spider) */
 	int* halfcard; /* byte offset of right half of cards (for spider) */
 	int halfwidth[3]; /* printed width of halfstack([0]) and halfcard([1]),
 	                     byte width of halfcard([2]) */
 };
 
+#define p "\017" /*padding, [RB]?CARD must have same length; alternative: \177*/
 #define ULCARD(s, r) (char*[]) \
 {"╭───╮",\
  "│"s" "r"│",\
@@ -24,10 +26,10 @@ struct scheme {
 #define RULCARD(s, r) \
 	ULCARD("\033[91m" s "\033[39m", r)
 #define BULCARD(s, r) \
-	ULCARD("\017\033[2m" s "\033[22m", r)//WARN: requires hack in print_hi()
+	ULCARD(p "\033[2m" s "\033[22m", r)//WARN: requires hack in print_hi()
 #define USCARD(c) (char*[]){c}
 #define RUSCARD(c) (char*[]){"\033[91m" c "\033[39m "}
-#define BUSCARD(c) (char*[]){"\017\017\017\017\017" c "\017\017\017\017\017 "}
+#define BUSCARD(c) (char*[]){c p p p p p p p p p p " "}
 
 const struct scheme unicode_large_mono = {
 	.width = 5,
@@ -79,6 +81,12 @@ const struct scheme unicode_large_mono = {
 		"╎   ╎",
 		"╰╌╌╌╯"
 	},
+	.foundation = (char*[]){
+		"╭╌╌╌╮",
+		"╎╭─╮╎",
+		"╎├─┤╎",
+		"╰╌╌╌╯"
+	},
 	.halfstack = (char*[]) {
 		"╭─",
 		"│▚",
@@ -138,6 +146,12 @@ const struct scheme unicode_large_color = {
 		"╎   ╎",
 		"╰╌╌╌╯"
 	},
+	.foundation = (char*[]){
+		"╭╌╌╌╮",
+		"╎\033[2m╭─╮\033[22m╎",
+		"╎\033[2m├─┤\033[22m╎",
+		"╰╌╌╌╯"
+	},
 	.halfstack = (char*[]) {
 		"╭─",
 		"│\033[94m▚\033[39m",
@@ -182,6 +196,7 @@ const struct scheme unicode_small_mono = {
 	},
 	.facedown = (char*[]){"🂠 "},
 	.placeholder = (char*[]){"❲❳"},
+	.foundation = (char*[]){"⟨⟩"},
 	.halfstack = (char*[]){"🂠"},
 	.halfcard = (int[]){0},
 	.halfwidth = {1, 1, 4},
@@ -221,8 +236,10 @@ const struct scheme unicode_small_color = {
 	},
 	.facedown = (char*[]){"🂠 "},
 	.placeholder = (char*[]){"❲❳"},
+	.foundation = (char*[]){"⟨⟩"},
 	.halfstack = (char*[]){"🂠"},
 	.halfcard = (int[]){0},
 	.halfwidth = {1, 1, 14},
 };
+#undef p
 #endif

sol.c

@@ -1407,7 +1407,7 @@ void print_table(const struct cursor* active, const struct cursor* inactive) {
 					/* cursor addr.     || direct addr.   */
 					inactive->opt==pile || inactive->opt < 0
 				), 1,
-				(card < 0)?op.s->placeholder[line]
+				(card < 0)?op.s->foundation[line]
 				:op.s->card[f.f[pile][card]][line]);
 		}
 		printf("\n");
@@ -1440,7 +1440,6 @@ void print_table(const struct cursor* active, const struct cursor* inactive) {
 #elif defined FREECELL
 	/* print open cells, foundation: */
 	for (int line = 0; line < op.s->height; line++) {
-		//FREECELL TODO: cells and foundation look the same! (different placeholder?)
 		for (int pile = 0; pile < NUM_CELLS; pile++)
 			print_hi (active->pile==STOCK && active->opt==pile,
 				inactive->pile==STOCK && (
@@ -1456,7 +1455,7 @@ void print_table(const struct cursor* active, const struct cursor* inactive) {
 					/* cursor addr.     || direct addr.   */
 					inactive->opt==pile || inactive->opt < 0
 				), 1,
-				(card < 0)?op.s->placeholder[line]
+				(card < 0)?op.s->foundation[line]
 				:op.s->card[f.f[pile][card]][line]);
 		}
 		printf("\n");