WIP: Show context

[JonathonReinhart]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@2df194f). Click here to learn what that means.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##             master      #23   +/-   ##
=========================================
  Coverage          ?   76.19%           
=========================================
  Files             ?        1           
  Lines             ?      252           
  Branches          ?        0           
=========================================
  Hits              ?      192           
  Misses            ?       60           
  Partials          ?        0

Impacted Files	Coverage Δ
bgrep.c	76.19% <66.66%> (ø)

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[JonathonReinhart]

Here's a first stab:

It's a little lacking in a few ways:

• Only one match per line is shown. It's going to be much more work to combine matches in a single row, but still keep the same left-hand output as before.
• It only shows the start of the match, in the event that it spans multiple rows.
• I'm not thrilled with the way the additional row starting address looks.