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

echo '# basic operation'
hg init basic
cd basic
echo a > a
hg commit -d '0 0' -A -m a
echo b >> a
hg commit -d '1 0' -m b

hg backout -d '2 0' tip
cat a

echo '# file that was removed is recreated'
cd ..
hg init remove
cd remove

echo content > a
hg commit -d '0 0' -A -m a

hg rm a
hg commit -d '1 0' -m b

hg backout -d '2 0' --merge tip
cat a

echo '# backout of backout is as if nothing happened'

hg backout -d '3 0' --merge tip
cat a 2>/dev/null || echo cat: a: No such file or directory

echo '# backout with merge'
cd ..
hg init merge
cd merge

echo line 1 > a
hg commit -d '0 0' -A -m a

echo line 2 >> a
hg commit -d '1 0' -m b

echo line 3 >> a
hg commit -d '2 0' -m c

hg backout --merge -d '3 0' 1
hg commit -d '4 0' -m d
cat a

exit 0