Merge branch 'rs/color-grep'

* rs/color-grep:
  grep: prefer builtin over external one when coloring results
  grep: cast printf %.*s "precision" argument explicitly to int
  grep: add support for coloring with external greps
  grep: color patterns in output
  grep: add pmatch and eflags arguments to match_one_pattern()
  grep: remove grep_opt argument from match_expr_eval()
  grep: micro-optimize hit collection for AND nodes

1 files changed, 19 insertions, 0 deletions

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 44916b9e7..12540b605 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -553,6 +553,25 @@ color.diff.<slot>::
 	whitespace errors). The values of these variables may be specified as
 	in color.branch.<slot>.
 
+color.grep::
+	When set to `always`, always highlight matches.  When `false` (or
+	`never`), never.  When set to `true` or `auto`, use color only
+	when the output is written to the terminal.  Defaults to `false`.
+
+color.grep.external::
+	The string value of this variable is passed to an external 'grep'
+	command as a command line option if match highlighting is turned
+	on.  If set to an empty string, no option is passed at all,
+	turning off coloring for external 'grep' calls; this is the default.
+	For GNU grep, set it to `--color=always` to highlight matches even
+	when a pager is used.
+
+color.grep.match::
+	Use customized color for matches.  The value of this variable
+	may be specified as in color.branch.<slot>.  It is passed using
+	the environment variables 'GREP_COLOR' and 'GREP_COLORS' when
+	calling an external 'grep'.
+
 color.interactive::
 	When set to `always`, always use colors for interactive prompts
 	and displays (such as those used by "git-add --interactive").