destutil: use cached branch information instead of query for efficiency
Before this patch, calculation of "the tipmost branch head on current
branch" uses revset query "max(.::(head() and branch(BRANCH)))", but
this isn't efficiency, because:
- head() predicate lists up heads on all branches, but
- branch() predicate eliminates heads on other branches
In addition to it, without "literal:" prefix for branch name,
branch(BRANCH) tries to (1) look up BRANCH in "repo.branchmap()" and
(2) look up BRANCH as symbol name again, if there is no branch
matching against BRANCH. The latter looking up is obviously redundant.
This patch uses repo.branchheads(closed=True) to get all branch heads
on specified branch instead of "head() and branch(BRANCH)" revset
query part.
This patch also makes catching RepoLookupError meaningless, because it
is only raised by revset predicate "branch()". But "currentbranch in
repo.branchmap()" can detect whether currentbranch actually exists or
not.
Therefore, this patch replaces try/except for RepoLookupError by
if/else for "currentbranch in repo.branchmap()".
#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories
# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"
# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")
# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()
from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)