hgweb: add a floating tooltip to invite on followlines action
In followlines.js, we create a <div id="followlines-tooltip"> element to draw
attention of users on "followlines" feature. The element shows up on hover of
source lines after one second and follows the cursor. After first click (start
line selection), the text changes and indicates that next click will terminate
selection.
from __future__ import absolute_import
import silenttestrunner
import unittest
from mercurial import util
class contextmanager(object):
def __init__(self, name, trace):
self.name = name
self.entered = False
self.exited = False
self.trace = trace
def __enter__(self):
self.entered = True
self.trace(('enter', self.name))
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.exited = exc_type, exc_val, exc_tb
self.trace(('exit', self.name))
def __repr__(self):
return '<ctx %r>' % self.name
class ctxerror(Exception):
pass
class raise_on_enter(contextmanager):
def __enter__(self):
self.trace(('raise', self.name))
raise ctxerror(self.name)
class raise_on_exit(contextmanager):
def __exit__(self, exc_type, exc_val, exc_tb):
self.trace(('raise', self.name))
raise ctxerror(self.name)
def ctxmgr(name, trace):
return lambda: contextmanager(name, trace)
class test_ctxmanager(unittest.TestCase):
def test_basics(self):
trace = []
addtrace = trace.append
with util.ctxmanager(ctxmgr('a', addtrace), ctxmgr('b', addtrace)) as c:
a, b = c.enter()
c.atexit(addtrace, ('atexit', 'x'))
c.atexit(addtrace, ('atexit', 'y'))
self.assertEqual(trace, [('enter', 'a'), ('enter', 'b'),
('atexit', 'y'), ('atexit', 'x'),
('exit', 'b'), ('exit', 'a')])
def test_raise_on_enter(self):
trace = []
addtrace = trace.append
def go():
with util.ctxmanager(ctxmgr('a', addtrace),
lambda: raise_on_enter('b', addtrace)) as c:
c.enter()
addtrace('unreachable')
self.assertRaises(ctxerror, go)
self.assertEqual(trace, [('enter', 'a'), ('raise', 'b'), ('exit', 'a')])
def test_raise_on_exit(self):
trace = []
addtrace = trace.append
def go():
with util.ctxmanager(ctxmgr('a', addtrace),
lambda: raise_on_exit('b', addtrace)) as c:
c.enter()
addtrace('running')
self.assertRaises(ctxerror, go)
self.assertEqual(trace, [('enter', 'a'), ('enter', 'b'), 'running',
('raise', 'b'), ('exit', 'a')])
if __name__ == '__main__':
silenttestrunner.main(__name__)