Different coloring for context lines

[jaroslawr]

It would be nice to be able to specify different coloring for context lines - lines that do not contain a match but come from application of -A/-B/-C options, e.g. rg --color nomatchline:fg:gray,line:fg:white. This is possible in vanilla grep like this:

GREP_COLORS="cx=37:" grep -R foo

[BurntSushi]

Can you specify the desired behavior when -v is used and matches in the context lines are highlighted? e.g., This is how ripgrep behaves now:

In the second example, bar is highlighted as a match even though it is in a non-matching context line.

I guess it looks like grep combines them?

Not quite sure how I feel about adding yet another color option though. Although I can see how "graying" out the context could lead to a nice effect.

[jaroslawr]

git grep also has the feature in question and has more understandable options than GREP_COLORS, it provides these color settings:

• match matching text (same as setting matchContext and matchSelected)
• matchSelected matching text in selected lines
• matchContext matching text in context lines (I guess covers the -v case you described)
• selected non-matching text in selected lines
• context non-matching text in context lines (per https://git-scm.com/docs/git-config, under "color.grep" section)

Taking inspiration from this, I think ripgrep could allow to set one or both of new options: matchSelected and matchContext, which when set would take precedence over the match option. Analogously it could allow to set lineSelected and lineContext, taking precedence over line when set.