diff: add --stat for diffstat output
diff/qdiff --stat invokes patch.diffstat() on the diff output.
When in interactive mode, the output's maximum width is determined by the
terminal's width.
#!/bin/sh
"$TESTDIR/hghave" gpg || exit 80
cat <<EOF >> $HGRCPATH
[extensions]
gpg=
[gpg]
cmd=gpg --no-permission-warning --no-secmem-warning --homedir $TESTDIR/gpg
EOF
hg init r
cd r
echo foo > foo
hg ci -Amfoo
echo '% no signatures'
hg sigs
echo '% hg sign 0'
hg sign 0
echo '% hg sigs'
hg sigs
echo '% hg sigcheck 0'
hg sigcheck 0