# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1554490485 14400
# Node ID 770e879997012a9bc928a7b5a4f73f9584625859
# Parent  2e2699af56498acd6fba0148029e1d00fe51a461
chistedit: use default curses colours

Terminals will define default colours (for example, white text on
black background), but curses doesn't obey those default colours
unless told to do so.

Calling `curses.use_default_colors` makes curses obey the default
terminal colours. One of the most obvious effects is that this allows
transparency on terminals that support it.

This also brings chistedit closer in appearance to crecord, which also
uses default colours.

The call may error out if the terminal doesn't support colors, but as
far as I can tell, everything still works. If we need a more careful
handling of lack of colours, blame me for not doing it now.

diff -r 2e2699af5649 -r 770e87999701 hgext/histedit.py
--- a/hgext/histedit.py	Sun Apr 07 16:53:47 2019 +0200
+++ b/hgext/histedit.py	Fri Apr 05 14:54:45 2019 -0400
@@ -1238,6 +1238,11 @@
     return displayer.hunk[rule.ctx.rev()].splitlines()
 
 def _chisteditmain(repo, rules, stdscr):
+    try:
+        curses.use_default_colors()
+    except curses.error:
+        pass
+
     # initialize color pattern
     curses.init_pair(COLOR_HELP, curses.COLOR_WHITE, curses.COLOR_BLUE)
     curses.init_pair(COLOR_SELECTED, curses.COLOR_BLACK, curses.COLOR_WHITE)