Subject: [PATCH 4/6] grep.c: display column number of first match

From: Taylor Blau <[email-masked]>
Date: Fri, 20 Apr 2018 20:45:37 -0700

Building upon our work in the previous commit to add members 'columnnum'
and 'color_columno' to 'grep_opt', we teach show_line() how to respect
those options.

When requested, show_line() will display the column number of the first
match on a non-context line. show_line() differentiates between context
and non-context lines through the '&& cno' check. 'cno' will be equal to
zero if and only if show_line() is invoked on a context line. It will be
a non-zero value otherwise.

Signed-off-by: Taylor Blau <[email-masked]>
---
 grep.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/grep.c b/grep.c
index 7872a5d868..5aeb893263 100644
--- a/grep.c
+++ b/grep.c
@@ -1404,6 +1404,12 @@ static void show_line(struct grep_opt *opt, char *bol, char *eol,
 		output_color(opt, buf, strlen(buf), opt->color_lineno);
 		output_sep(opt, sign);
 	}
+	if (opt->columnnum && cno) {
+		char buf[32];
+		xsnprintf(buf, sizeof(buf), "%d", cno);
+		output_color(opt, buf, strlen(buf), opt->color_columnno);
+		output_sep(opt, sign);
+	}
 	if (opt->color) {
 		regmatch_t match;
 		enum grep_context ctx = GREP_CONTEXT_BODY;
-- 
2.17.0