Pushed. Thanks!
Excerpts from Martin von Zweigbergk's message of 2017-05-22 22:17:49 -0700:
> # HG changeset patch
> # User Martin von Zweigbergk <martinv...@google.com>
> # Date 1495516223 25200
> # Mon May 22 22:10:23 2017 -0700
> # Node ID 53bbe5f3591b2fde3aba487b8d548f44d49478d4
> # Parent e32ef07e0de21267a964a3298e3144701a6a98e7
> chistedit: fail only when attempting to run if curses is not found
>
> If curses is not available, we can still be nice and not fail until
> the user actually tries to run the chistedit command.
>
> diff --git a/hgext3rd/chistedit.py b/hgext3rd/chistedit.py
> --- a/hgext3rd/chistedit.py
> +++ b/hgext3rd/chistedit.py
> @@ -43,7 +43,7 @@
> try:
> import curses
> except ImportError:
> - print("Python curses library required", file=sys.stderr)
> + curses = None
>
> KEY_LIST = ['pick', 'edit', 'fold', 'drop', 'mess', 'roll']
> ACTION_LABELS = {
> @@ -548,6 +548,9 @@
> """Provides a ncurses interface to histedit. Press ? in chistedit mode
> to see an extensive help. Requires python-curses to be installed."""
>
> + if curses is None:
> + raise error.Abort(_("Python curses library required"))
> +
> # disable color
> ui._colormode = None
>
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