windows: add a method to convert Unix style command lines to Windows style This started as a copy/paste of `os.path.expandvars()`, but limited to a given dictionary of variables, converting `foo = foo + bar` to `foo += bar`, and adding 'b' string prefixes. Then code was added to make sure that a value being substituted in wouldn't itself be expanded by cmd.exe. But that left inconsistent results between `$var1` and `%var1%` when its value was '%foo%'- since neither were touched, `$var1` wouldn't expand but `%var1%` would. So instead, this just converts the Unix style to Windows style (if the variable exists, because Windows will leave `%missing%` as-is), and lets cmd.exe do its thing. I then dropped the %% -> % conversion (because Windows doesn't do this), and added the ability to escape the '$' with '\'. The escape character is dropped, for consistency with shell handling. After everything seemed stable and working, running the whole test suite flagged a problem near the end of test-bookmarks.t:1069. The problem is cmd.exe won't pass empty variables to its child, so defined but empty variables are now skipped. I can't think of anything better, and it seems like a pre-existing violation of the documentation, which calls out that HG_OLDNODE is empty on bookmark creation. Future additions could potentially be replacing strong quotes with double quotes (cmd.exe doesn't know what to do with the former), escaping a double quote, and some tilde expansion via os.path.expanduser(). I've got some doubts about replacing the strong quotes in case sh.exe is run, but it seems like the right thing to do the vast majority of the time. The original form of this was discussed about a year ago[1]. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-July/100735.html

hgweb: add archive entries to graph page Changelog page has them, so it makes sense to add them to graph page too.

hgweb: add z-index for search field tooltip On graph page, search field tooltip sometimes goes down to the graph area, where it used to be covered by foreground element of graph entries (.fg) because they have z-index: 10. To prevent the tooltip from being covered, z-index: 15 is enough.

tests: pass "rev" argument to commands.update() as string commands.update() normally gets its "rev" argument as a string, but test-basic.t was passing an integer. That happened to work, but we shouldn't rely on it. Differential Revision: https://phab.mercurial-scm.org/D3851

revset: fix heads() order to always follow the input set (BC) An argument expression should never affect the order of the result set. That's the rule of the revset predicates.

test-revset: show that order of heads() can be wrong

stringutil: update list of re-special characters to include &~ I missed this because I was looking at the change that refactored re.escape, and these characters were added in https://github.com/python/cpython/commit/05cb728d68a278d11466f9a6c8258d914135c96c. Differential Revision: https://phab.mercurial-scm.org/D3850

tests: fix up some lax escaping in test-template-basic.t These misfired escapes turn into hard errors in Python 3.7, and I'd really rather we not work around it. We should *probably* try and find a way to proactively warn users about invalid escape sequences. There's one more failure of this type in this file on Python 3.7, but I can't figure out the issue. It'll need to be corrected in a follow-up. Differential Revision: https://phab.mercurial-scm.org/D3843

cleanup: migrate from re.escape to stringutil.reescape This has consistent behavior on Python 2.7, 3.6, and 3.7 and has the benefit of probably being a little faster. Test output changes are largely because / used to be pointlessly escaped. Differential Revision: https://phab.mercurial-scm.org/D3842

stringutil: add a new function to do minimal regex escaping Per https://bugs.python.org/issue29995, re.escape() used to over-escape regular expression strings, but in Python 3.7 that's been fixed, which also improved the performance of re.escape(). Since it's both an output change for us *and* a perfomance win, let's just effectively backport the new behavior to hg on all Python versions. Differential Revision: https://phab.mercurial-scm.org/D3841