view tests/test-churn.out @ 7654:816b708f23af

store all heads of a branch in the branch cache

All heads of branches will be stored in a new cache file 'branchheads.cache'
within the .hg directory. The old 'branch.cache' file from older versions
will be ignored.

The new cache contents are formatted line-by-line as '{node} {branchtag}\n'.
This is the same as the previous format. Now, every head is recorded in
an oldest -> tipmost order.

The localrepo.branchheads function is reworked to use the data from the cache.

% create test repository
adding a
adding b
adding c
% churn all
user3      3 ***************************************************************
user2      2 ******************************************
user1      1 *********************
% churn up to rev 2
user2      2 ***************************************************************
user1      1 *******************************
% churn with aliases
alias3      3 **************************************************************
user2       2 *****************************************
alias1      1 ********************
% churn with column specifier
user3      3 ***********************
user2      2 ***************
user1      1 *******
% churn by hour
06      1 **********************
09      2 ********************************************
12      3 ******************************************************************