76 lines
1.7 KiB
Plaintext
76 lines
1.7 KiB
Plaintext
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#!/bin/sh
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#
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# culldeps
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#
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# Filter redundant dependencies.
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#
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# Emit all the dependencies on the standard input to the standard
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# output EXCEPT the dependencies which can be derived from other
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# dependencies by the transitive rule. For example, omit both A C
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# and A D from
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#
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# A B
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# B C
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# C D
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# A C
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# A D
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#
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# because A C can be derived from A B and B C by transitivity,
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# and A D can be derived from A B, B C, C D by transitivity.
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#
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SCRATCH=$(mktemp -d /var/tmp/$0.XXXXXX)
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NEXTLEFTOVERS=$SCRATCH/leftovers0
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LASTJOIN=$SCRATCH/join0
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NEXTJOIN=$SCRATCH/join1
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TAB=" "
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sort -k 1 > $LASTJOIN
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LEFTOVERS=$LASTJOIN
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while [ $(wc -l $LASTJOIN | awk '{ print $1; }') -ne 0 ]; do
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#
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# From dependencies X-requires-Y in $LEFTOVERS and Y-requires-Z in
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# $LASTJOIN, produce dependencies X-requires-Z and write them to
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# $NEXTJOIN.
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#
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sort -k 2 < $LEFTOVERS | join -1 2 -2 1 -o '1.1 2.2' - $LASTJOIN | \
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sort -u > $NEXTJOIN
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if [ ${DEBUG:-0} -gt 0 ]; then
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echo "### filtered ###" 1>&2
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join -t "$TAB" $NEXTJOIN $LEFTOVERS | sort 1>&2
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echo "###" 1>&2
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fi
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#
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# Filter out of $LEFTOVERS all of the dependencies X-requires-Z, which
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# were produced in the previous step. Write the new leftovers to
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# $NEXTLEFTOVERS.
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#
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join -v 2 -t "$TAB" $NEXTJOIN $LEFTOVERS | sort -u > $NEXTLEFTOVERS
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#
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# Swap output files before repeating.
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#
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LASTJOIN=$NEXTJOIN
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if [ $(basename $NEXTJOIN) = join0 ]; then
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NEXTJOIN=$SCRATCH/join1
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else
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NEXTJOIN=$SCRATCH/join0
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fi
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LEFTOVERS=$NEXTLEFTOVERS
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if [ $(basename $NEXTLEFTOVERS) = leftovers0 ]; then
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NEXTLEFTOVERS=$SCRATCH/leftovers1
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else
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NEXTLEFTOVERS=$SCRATCH/leftovers0
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fi
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done
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#
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# Output all of the dependencies that were not culled and clean up.
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#
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cat $LEFTOVERS
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rm -r $SCRATCH
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