templater: add separate() template function
A pretty common pattern in templates is adding conditional separators
like so:
{node}{if(bookmarks, " {bookmarks}")}{if(tags, " {tags}")}
With this patch, the above can be simplified to:
{separate(" ", node, bookmarks, tags)}
The function is similar to the already existing join(), but with a few
differences:
* separate() skips empty arguments
* join() expects a single list argument, while separate() expects
each item as a separate argument
* separate() takes the separator first in order to allow a variable
number of arguments after it
#!/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)