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#!/bin/sh
# TODO:
# support setting flag when no upstream default
set -e +x
USAGE="Usage: $0 FLAG [True|False]"
if [ $# -ne 2 ]; then
echo "$USAGE"
exit 1
fi
FLAG=$1
NEW=$2
case $NEW in
True) OLD=False ;;
False) OLD=True ;;
*) echo "Flag value can only be set to True or False" ; exit 1 ;;
esac
CABALFILE=$(ls *.cabal)
if [ $(echo $CABALFILE | wc -w) -ne 1 ]; then
echo "There needs to be one .cabal file in the current dir!"
exit 1
fi
if ! grep -q -i "^flag *$FLAG" $CABALFILE; then
echo "$CABALFILE does have flag $FLAG"
exit 1
fi
if ! grep -A3 -i "^flag *$FLAG" $CABALFILE | grep -q -i "default:"; then
echo "$CABALFILE: $FLAG flag might not have a default"
exit 1
fi
if ! grep -A3 -i "^flag *$FLAG" $CABALFILE | grep -q -i "default: *$OLD"; then
echo "$CABALFILE: $FLAG flag already defaults to $NEW"
exit 1
fi
if [ ! -f $CABALFILE.orig ]; then
BACKUP=.orig
fi
sed -i$BACKUP -e "/[Ff]lag *$FLAG/,/[Dd]efault: *$OLD/ s/\([Dd]efault: *\)$OLD/\1$NEW/" $CABALFILE
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