templatekw: make negrev return empty for wdir() and nullrev
I considered just returning the same output that {rev} returns here,
but {rev} also returns essentially gibberish: either an INT_MAX-kind
of variable for wdir() or -1 for null. Since these are numbers that
are intended to be used for calculations, and since the numbers for
wdir() and -1 are not really very helpful for calculation (and worse,
when used as a revision number -1 is equal to unhidden tip), I figured
the most reasonable thing to do here is to just return nothing for
negrev.
This could potentially break scripts that are expecting to parse a
nonempty integer out of a {negrev}, but that seems like a very remote
concern at this juncture.
#!/bin/rc
# 9diff - Mercurial extdiff wrapper for diff(1)
rfork e
fn getfiles {
cd $1 &&
for(f in `{du -as | awk '{print $2}'})
test -f $f && echo `{cleanname $f}
}
fn usage {
echo >[1=2] usage: 9diff [diff options] parent child root
exit usage
}
opts=()
while(~ $1 -*){
opts=($opts $1)
shift
}
if(! ~ $#* 3)
usage
# extdiff will set the parent and child to a single file if there is
# only one change. If there are multiple changes, directories will be
# set. diff(1) does not cope particularly with directories; instead we
# do the recursion ourselves and diff each file individually.
if(test -f $1)
diff $opts $1 $2
if not{
# extdiff will create a snapshot of the working copy to prevent
# conflicts during the diff. We circumvent this behavior by
# diffing against the repository root to produce plumbable
# output. This is antisocial.
for(f in `{sort -u <{getfiles $1} <{getfiles $2}}){
file1=$1/$f; test -f $file1 || file1=/dev/null
file2=$3/$f; test -f $file2 || file2=/dev/null
diff $opts $file1 $file2
}
}
exit ''