fix parsing of tags. make parse errors useful. add new tag tests. old code read every head of .hgtags. delete and recreate of .hgtags gave new head, but if error in deleted rev, .hgtags had error messages every time it was parsed. this was very hard to fix, because deleted revs hard to get back and update, needed merges too. new code reads .hgtags on every head. advantage is if parse error happens with new code, is possible to fix them by editing .hgtags on a head and committing. NOTE: new code uses binary search of manifest of each head to be fast, but still much slower than old code. best thing would be to have delete record stored in filelog so we never touch manifest. could find live heads directly from filelog. this is more work than i want now. new tests check for parse of tags on different heads, and inaccessible heads created by delete and recreate of .hgtags.

#!/bin/sh

hg init
echo foo > a
hg add a
hg commit -m "1" -d "1000000 0"

echo bar > b
hg add b
hg remove a

echo "%%% should show a removed and b added"
hg status

echo "reverting..."
hg revert

echo "%%% should show b unknown and a back to normal"
hg status

rm b

hg co -C 0
echo foo-a > a
hg commit -m "2a" -d "1000000 0"

hg co -C 0
echo foo-b > a
hg commit -m "2b" -d "1000000 0"

HGMERGE=true hg merge 1

echo "%%% should show foo-b"
cat a

echo bar > b
hg add b
rm a
hg remove a

echo "%%% should show a removed and b added"
hg status

echo "%%% revert should fail"
hg revert

echo "%%% revert should be ok now"
hg revert -r2

echo "%%% should show b unknown and a marked modified (merged)"
hg status

echo "%%% should show foo-b"
cat a