Add -c option to manually specify colours.

This behaves pretty much identically to -t. It sets up a pool of
available colours, which are assigned to pipes in order and which is
chosen from when randomising.

README.rst

@@ -135,6 +135,31 @@ Custom pipe, for example: ``-t cMAYFORCEBWITHYOU``.
 
 .. figure:: doc/pipes.tc.png
 
+``-c [0-7]``
+------------
+
+Color of pipes, can be used more than once (D=1 2 3 4 5 6 7 0).
+
+Numbers are terminal color numbers. Traditionally typical values are:
+
++---+------------+
+| 0 | background |
++---+------------+
+| 1 | red        |
++---+------------+
+| 2 | green      |
++---+------------+
+| 3 | yellow     |
++---+------------+
+| 4 | blue       |
++---+------------+
+| 5 | magenta    |
++---+------------+
+| 6 | cyan       |
++---+------------+
+| 7 | foreground |
++---+------------+
+
 ``-f [20-100]``
 ---------------
 

pipes.sh

@@ -39,7 +39,7 @@ NOCOLOR=0
 NOEDGECHANGE=0
 
 OPTIND=1
-while getopts "p:t:f:s:r:RBCEhv" arg; do
+while getopts "p:t:c:f:s:r:RBCEhv" arg; do
 case $arg in
     p) ((p=(OPTARG>0)?OPTARG:p));;
     t)
@@ -50,6 +50,7 @@ case $arg in
             ((OPTARG>=0 && OPTARG<${#sets[@]})) && V+=($OPTARG)
         fi
         ;;
+    c) [[ $OPTARG =~ ^[0-7]$ ]] && C+=($OPTARG);;
     f) ((f=(OPTARG>19 && OPTARG<101)?OPTARG:f));;
     s) ((s=(OPTARG>4 && OPTARG<16 )?OPTARG:s));;
     r) ((r=(OPTARG>=0)?OPTARG:r));;
@@ -61,6 +62,7 @@ case $arg in
         echo -e "Animated pipes terminal screensaver.\n"
         echo -e " -p [1-]\tnumber of pipes (D=1)."
         echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes, can be used more than once (D=0)."
+        echo -e " -c [0-7]\tcolor of pipes, can be used more than once (D=1 2 3 4 5 6 7 0)."
         echo -e " -t c[16 chars]\tcustom type of pipes."
         echo -e " -f [20-100]\tframerate (D=75)."
         echo -e " -s [5-15]\tprobability of a straight fitting (D=13)."
@@ -79,6 +81,7 @@ done
 
 # set default values if not by options
 ((${#V[@]})) || V=(0)
+((${#C[@]})) || C=(1 2 3 4 5 6 7 0)
 
 cleanup() {
     # clear up standard input
@@ -100,7 +103,9 @@ trap 'break 2' INT
 resize
 
 for (( i=1; i<=p; i++ )); do
-    c[i]=$((i%8)) n[i]=0 l[i]=0
+    c[i]=${C[$(((i-1)%${#C[@]}))]}
+    n[i]=0
+    l[i]=0
     ((x[i]=RNDSTART==1?RANDOM*w/32768:w/2))
     ((y[i]=RNDSTART==1?RANDOM*h/32768:h/2))
     v[i]=${V[$(((i-1)%${#V[@]}))]}
@@ -117,7 +122,7 @@ while REPLY=; read -t 0.0$((1000/f)) -n 1 2>/dev/null; [[ -z $REPLY ]] ; do
         ((${l[i]}%2)) && ((x[i]+=-${l[i]}+2,1)) || ((y[i]+=${l[i]}-1))
 
         # Loop on edges (change color on loop):
-        ((!NOEDGECHANGE&&(${x[i]}>=w||${x[i]}<0||${y[i]}>=h||${y[i]}<0))) && ((c[i]=RANDOM%8, v[i]=V[${#V[@]}*RANDOM/M]))
+        ((!NOEDGECHANGE&&(${x[i]}>=w||${x[i]}<0||${y[i]}>=h||${y[i]}<0))) && ((c[i]=${C[$((RANDOM%${#C[@]}))]}, v[i]=V[${#V[@]}*RANDOM/M]))
         ((x[i]=(x[i]+w)%w))
         ((y[i]=(y[i]+h)%h))