Add 2020 source files for real

2020/ferguson1/snake-colours.sh

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+#!/bin/bash
+#
+# Snake script that prompts for the colours desired for the colours for the
+# walls, the head and body of the snake and the bug, and then proceeds to
+# compile Snake with that profile and then start the game. If there's an input
+# error it uses the default colour for the specific item.
+#
+# I don't disable any colours in the script even those that will probably be
+# hard to see; interestingly although maybe not as easy to see black on black is
+# not impossible to see. It's more like a grey on black. White background will
+# probably be a problem but then again maybe not.
+#
+# Usage:
+#
+#   [VAR=VAL ...] ./snake-colours
+#
+# Examples:
+#
+#   WALLS=0 ./snake-colours
+#   ./snake-colours
+#
+# Why did I choose the colours I did? Because there are snakes with red heads
+# and although the one I am aware of has a blue body it's easier to see (for my
+# eyes at least) the green. At first I had red bugs but I thought white is
+# easier to see and the red head with a green body also easier to see.
+# Unfortunately blue on black doesn't turn out so great and the cyan for the
+# snake body with a different colour for the wall didn't quite do it for me. But
+# I explain how you can change these anyway. Anyway I love redheads and the
+# snake in question Red-headed krait
+# (https://en.wikipedia.org/wiki/Red-headed_krait) is stunningly beautiful too.
+#
+# Last updated: 13 May 2020
+COLOUR[0]="BLACK"
+COLOUR[1]="RED"
+COLOUR[2]="GREEN"
+COLOUR[3]="YELLOW"
+COLOUR[4]="BLUE"
+COLOUR[5]="MAGENTA"
+COLOUR[6]="CYAN"
+COLOUR[7]="WHITE"
+DFLT[0]="-DWALL=COLOR_CYAN"	# Wall foreground: cyan	    (WALL)
+DFLT[1]="-DWB=COLOR_BLACK"	# Wall background: black    (WB)
+DFLT[2]="-DHEAD=COLOR_RED"	# Head foreground: red	    (HEAD)
+DFLT[3]="-DHB=COLOR_BLACK"	# Head background: black    (HB)
+DFLT[4]="-DBODY=COLOR_GREEN"	# Body foreground: green    (BODY)
+DFLT[5]="-DBS=COLOR_BLACK"	# Body background: black    (BS)
+DFLT[6]="-DBG=COLOR_WHITE"	#  Bug foreground: white    (BG)
+DFLT[7]="-DBB=COLOR_BLACK"	#  Bug background: black    (BB)
+COLOURS[0]="-DWALL=COLOR_"
+COLOURS[1]="-DWB=COLOR_"
+COLOURS[2]="-DHEAD=COLOR_"
+COLOURS[3]="-DHB=COLOR_"
+COLOURS[4]="-DBODY=COLOR_"
+COLOURS[5]="-DBS=COLOR_"
+COLOURS[6]="-DBG=COLOR_"
+COLOURS[7]="-DBB=COLOR_"
+
+function show_colours()
+{
+    echo "Colour selection for ${*} (enter for default)"
+    for i in 0 1 2 3 4 5 6 7; do
+	printf "(%d) %s\n" "${i}" "${COLOUR[${i}]}"
+    done
+    read -rp "Make selection (1 - 7): " colour
+
+    case "${colour}" in
+	0|1|2|3|4|5|6|7)
+	    return "${colour}"
+	    ;;
+	*)
+	    return 255
+	    ;;
+    esac
+}
+function configure_colours()
+{
+    j=0
+    for i in "WALL" "WALL (BACKGROUND)" "HEAD" "HEAD (BACKGROUND)" "BODY" "BODY (BACKGROUND)" "BUG" "BUG (BACKGROUND)"; do
+	show_colours "${i}"
+	x="${?}"
+	if [ "${x}" != 255 ]; then
+	    COLOURS[$j]="${COLOURS[$j]}${COLOUR[$x]}"
+	else
+	    COLOURS[$j]=${DFLT[$j]}
+	fi
+	j=$j+1
+    done
+
+    echo cc -o prog.alt prog.alt.c -D'f(a,b)'='((a)<(b)?(a):(b))' ${COLOURS[0]} ${COLOURS[1]} \
+	${COLOURS[2]} ${COLOURS[3]} ${COLOURS[4]} ${COLOURS[5]} ${COLOURS[6]} ${COLOURS[7]} -lncurses
+
+    cc -o prog.alt prog.alt.c -D'f(a,b)'='((a)<(b)?(a):(b))' ${COLOURS[0]} ${COLOURS[1]} \
+	${COLOURS[2]} ${COLOURS[3]} ${COLOURS[4]} ${COLOURS[5]} ${COLOURS[6]} ${COLOURS[7]} -lncurses || exit 1
+}
+
+make
+
+./termcaps
+T="${?}"
+if [ "${T}" -ne 0 ]; then
+    read -rp  "Terminal issues detected; do you wish to continue anyway (Y/N) ? " ans
+    [[ "${ans}" != "y" ]] && [[ "${ans}" != "Y" ]] && exit 1
+fi
+
+configure_colours
+
+clear && ./prog.alt