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#!/bin/sh
set -e +x
USAGE="Usage: $0 dep old new"
if [ $# -ne 3 ]; then
echo "$USAGE"
exit 1
fi
DEP=$1
OLD=$(echo $2 | sed -e "s/*/\\\\*/g" -e "s/\./\\\\./g")
NEW=$3
CABALFILE=$(ls *.cabal)
if [ $(echo $CABALFILE | wc -w) -ne 1 ]; then
echo "There needs to be one .cabal file in the current dir!"
exit 1
fi
BREAK=[^[:alnum:]-]
if ! grep -q "$BREAK$DEP$BREAK[^,]*$OLD" $CABALFILE; then
echo "$CABALFILE does not match: $DEP $OLD"
exit 1
fi
if [ ! -f $CABALFILE.orig ]; then
BACKUP=.orig
fi
sed -i$BACKUP -e "s/\($BREAK$DEP$BREAK[^,]*\)$OLD/\1$NEW/g" $CABALFILE
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