#Lua 5.2, 740 Bytes

s=io.read W=io.write Z=math.max A=math.min
D="d"U="u"L="l"R="r"function n()G=A(G,i)H=Z(H,i)I=A(I,j)J=Z(J,j)i=(a==D and i+1 or a==U and i-1 or i)j=(a==R and j+1 or a==L and j-1 or j)end
w=s"*n"d=s(1)c=s(1)r=(c=="c")and s"*n"or c
c=c=="c"M=w*(r+1)o={}for i=1,M do o[i]={}for j=1,M do o[i][j]=" "end end
i=M/2 j=i G=i H=i I=i J=i
for q=1,r do a=d m=1 l=1 z=0
o[i][j]="@"for k=3,w^2 do
n()if l==m then
a=c and(a==D and R or a==U and L or a==L and D or a==R and U)or(a==D and L or a==U and R or a==L and U or a==R and D)o[i][j]=(a==D and"v"or a==U and"^"or a==L and"<"or a==R and">")
if z==0 then z=1 else m=m+1;z=0 end
l=1
else
l=l+1
o[i][j]=(a==D or a==U)and"|"or"-"end end
n()o[i][j]="&"end
for i=G,H do for j=I,J do
W(o[i][j])end W("\n")end

I though that it would be fun to try to implement some algorithm to beat Lisp, but Lua is probably not the best option. I spend too much time on it, over-engineered some parts to end with this uggly one, but working solution. Probably I will try different language later to beat Lisp since there is some 90 characters that I can't take away from this algorithm.

Testing outputs:

jakuje@E6430:/tmp$ echo "2d4" | lua s.lua 
&@@@@
^<<<<
jakuje@E6430:/tmp$ echo "4rc3" | lua s.lua 
&--<  
v-<|  
|@^|< 
>--^| 
 |@^|<
 >--^|
  |@^|
  >--^
jakuje@E6430:/tmp$ echo "7u1" | lua s.lua 
&>----v
||>--v|
|||>v||
|||@|||
||^-<||
|^---<|
^-----<

Lua 5.2, 740 Bytes

s=io.read W=io.write Z=math.max A=math.min
D="d"U="u"L="l"R="r"function n()G=A(G,i)H=Z(H,i)I=A(I,j)J=Z(J,j)i=(a==D and i+1 or a==U and i-1 or i)j=(a==R and j+1 or a==L and j-1 or j)end
w=s"*n"d=s(1)c=s(1)r=(c=="c")and s"*n"or c
c=c=="c"M=w*(r+1)o={}for i=1,M do o[i]={}for j=1,M do o[i][j]=" "end end
i=M/2 j=i G=i H=i I=i J=i
for q=1,r do a=d m=1 l=1 z=0
o[i][j]="@"for k=3,w^2 do
n()if l==m then
a=c and(a==D and R or a==U and L or a==L and D or a==R and U)or(a==D and L or a==U and R or a==L and U or a==R and D)o[i][j]=(a==D and"v"or a==U and"^"or a==L and"<"or a==R and">")
if z==0 then z=1 else m=m+1;z=0 end
l=1
else
l=l+1
o[i][j]=(a==D or a==U)and"|"or"-"end end
n()o[i][j]="&"end
for i=G,H do for j=I,J do
W(o[i][j])end W("\n")end

I though that it would be fun to try to implement some algorithm to beat Lisp, but Lua is probably not the best option. I spend too much time on it, over-engineered some parts to end with this uggly one, but working solution. Probably I will try different language later to beat Lisp since there is some 90 characters that I can't take away from this algorithm.

Testing outputs:

jakuje@E6430:/tmp$ echo "2d4" | lua s.lua 
&@@@@
^<<<<
jakuje@E6430:/tmp$ echo "4rc3" | lua s.lua 
&--<  
v-<|  
|@^|< 
>--^| 
 |@^|<
 >--^|
  |@^|
  >--^
jakuje@E6430:/tmp$ echo "7u1" | lua s.lua 
&>----v
||>--v|
|||>v||
|||@|||
||^-<||
|^---<|
^-----<

#Lua 5.2, 740 Bytes

s=io.read W=io.write Z=math.max A=math.min
D="d"U="u"L="l"R="r"function n()i=(a==D and i+1 or a==U and i-1 or i)j=(a==R and j+1 or a==L and j-1 or j)end
w=s"*n"d=s(1)c=s(1)r=(c=="c")and s"*n"or c
c=c=="c"M=w*(r+1)o={}for i=1,M do o[i]={}for j=1,M do o[i][j]=" "end end
i=M/2 j=i G=i H=i I=i J=i
for q=1,r do a=d m=1 l=1 z=0 
o[i][j]="@"for k=3,w^2 do
G=A(G,i)H=Z(H,i)I=A(I,j)J=Z(J,j)n()if l==m then
a=c and(a==D and R or a==U and L or a==L and D or a==R and U)or(a==D and L or a==U and R or a==L and U or a==R and D)o[i][j]=(a==D and"v"or a==U and"^"or a==L and"<"or a==R and">")
if z==0 then z=1 else m=m+1;z=0 end
l=1
else
l=l+1
o[i][j]=(a==D or a==U)and"|"or"-"end end 
n()o[i][j]="&"end
for i=G,H do for j=I,J do
W(o[i][j])end W("\n")end

I though that it would be fun to try to implement some algorithm to beat Lisp, but Lua is probably not the best option. I spend too much time on it, over-engineered some parts to end with this uggly one, but working solution. Probably I will try different language later to beat Lisp since there is some 90 characters that I can't take away from this algorithm.

Testing outputs:

jakuje@E6430:/tmp$ echo "2d4" | lua s.lua 
&@@@@
^<<<<
jakuje@E6430:/tmp$ echo "4rc3" | lua s.lua 
&--<  
v-<|  
|@^|< 
>--^| 
 |@^|<
 >--^|
  |@^|
  >--^
jakuje@E6430:/tmp$ echo "7u1" | lua s.lua 
&>----v
||>--v|
|||>v||
|||@|||
||^-<||
|^---<|
^-----<

#Lua 5.2, 740 Bytes

s=io.read W=io.write Z=math.max A=math.min
D="d"U="u"L="l"R="r"function n()G=A(G,i)H=Z(H,i)I=A(I,j)J=Z(J,j)i=(a==D and i+1 or a==U and i-1 or i)j=(a==R and j+1 or a==L and j-1 or j)end
w=s"*n"d=s(1)c=s(1)r=(c=="c")and s"*n"or c
c=c=="c"M=w*(r+1)o={}for i=1,M do o[i]={}for j=1,M do o[i][j]=" "end end
i=M/2 j=i G=i H=i I=i J=i
for q=1,r do a=d m=1 l=1 z=0
o[i][j]="@"for k=3,w^2 do
n()if l==m then
a=c and(a==D and R or a==U and L or a==L and D or a==R and U)or(a==D and L or a==U and R or a==L and U or a==R and D)o[i][j]=(a==D and"v"or a==U and"^"or a==L and"<"or a==R and">")
if z==0 then z=1 else m=m+1;z=0 end
l=1
else
l=l+1
o[i][j]=(a==D or a==U)and"|"or"-"end end
n()o[i][j]="&"end
for i=G,H do for j=I,J do
W(o[i][j])end W("\n")end

I though that it would be fun to try to implement some algorithm to beat Lisp, but Lua is probably not the best option. I spend too much time on it, over-engineered some parts to end with this uggly one, but working solution. Probably I will try different language later to beat Lisp since there is some 90 characters that I can't take away from this algorithm.

Testing outputs:

jakuje@E6430:/tmp$ echo "2d4" | lua s.lua 
&@@@@
^<<<<
jakuje@E6430:/tmp$ echo "4rc3" | lua s.lua 
&--<  
v-<|  
|@^|< 
>--^| 
 |@^|<
 >--^|
  |@^|
  >--^
jakuje@E6430:/tmp$ echo "7u1" | lua s.lua 
&>----v
||>--v|
|||>v||
|||@|||
||^-<||
|^---<|
^-----<