tests/test-chg.t

histedit: add experimental config for using the first word of the commit

This allows users to start a commit with "verb! ..." so that when this is
opened in histedit, the default action will be "verb". For example, "roll! foo"
will default to the action "roll". Currently, we'll allow any known verb to be
used but this is experimental.

init repo

  $ hg init foo
  $ cd foo

ill-formed config

  $ hg status
  $ echo '=brokenconfig' >> $HGRCPATH
  $ hg status
  hg: parse error at * (glob)
  [255]

alias having an environment variable and set to use pager

  $ rm $HGRCPATH
  $ cat >> $HGRCPATH <<'EOF'
  > [ui]
  > formatted = yes
  > [extensions]
  > pager =
  > [pager]
  > pager = sed -e 's/^/P/'
  > attend = printa
  > [alias]
  > printa = log -T "$A\n" -r 0
  > EOF

  $ A=1 hg printa
  P1
  $ A=2 hg printa
  P2