exercises/patches/gollum.sh

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#!/bin/sh
#
# "It isn't fair, my precious, is it,
# to ask us what it's got in it's
# nassty little pocketsess?"
# Gollum, The Hobbit, or There and Back Again
#
if [ ! -f 'patches/gollum.sh' ]
then
echo "We must be run from the project root dir, precious!"; exit 1
fi
ex=$(printf "%03d" $1)
echo "Nassssty exercise $ex..."
f=$(basename exercises/${ex}_*.zig .zig 2> /dev/null)
b=exercises/$f.zig
a=answers/$f.zig
p=patches/patches/$f.patch
if [ ! -f $b ]; then echo "No $f! We hates it!"; exit 1; fi
if [ ! -f $a ]; then echo "No $a! Where is it? Where is the answer, precious?"; exit; fi
echo "Hissss! before: '$b'"
echo " after: '$a'"
echo " patch: '$p'"
diff -u $b $a > $p
cat $p