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grep: fix --column --only-match for 2nd and later matches 

"git grep --column --only-match" shows the 1-based column number of the
first match on each line, but confusing numbers for further matches.
Example:

   $ echo 123456789012345678901234567890 >file
   $ for d in 1 2 3 4 5 6 7 8 9 0
     do
       git grep --no-index --column --only-matching $d file |
       awk -v FS=: -v l=$d: '{l = l sprintf("%3s", $2)} END {print l}'
     done
   1:  1  2 12
   2:  2  4 14
   3:  3  6 16
   4:  4  8 18
   5:  5 10 20
   6:  6 12 22
   7:  7 14 24
   8:  8 16 26
   9:  9 18 28
   0: 10 20 30

Report the column number of each match instead:

   $ for d in 1 2 3 4 5 6 7 8 9 0
     do
       ./git grep --no-index --column --only-matching $d file |
       awk -v FS=: -v l=$d: '{l = l sprintf("%3s", $2)} END {print l}'
     done
   1:  1 11 21
   2:  2 12 22
   3:  3 13 23
   4:  4 14 24
   5:  5 15 25
   6:  6 16 26
   7:  7 17 27
   8:  8 18 28
   9:  9 19 29
   0: 10 20 30

We need to adjust the test in t7810 as well.  The file it uses has the
following five lines; I add a line highlighting the matches and a ruler
at the bottom here, to make it easier to see that the second "mmap"
indeed starts at column 14:

foo mmap bar
foo_mmap bar
foo_mmap bar mmap
foo mmap bar_mmap
foo_mmap bar mmap baz
    ====     ====
123456789 123456789 1

Reported-by: Brandon Chinn <brandonchinn178@gmail.com>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
main
René Scharfe 2026-04-24 23:04:27 +02:00 committed by Junio C Hamano
parent 67ad42147a
commit 9ff4b5ab1b
2 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
grep.c
View File

@ -1267,6 +1267,7 @@ static void show_line(struct grep_opt *opt,
regmatch_t match;
enum grep_context ctx = GREP_CONTEXT_BODY;
int eflags = 0;
const char *start = bol;

if (want_color(opt->color)) {
if (sign == ':')
@ -1285,6 +1286,7 @@ static void show_line(struct grep_opt *opt,
if (match.rm_so == match.rm_eo)
break;

cno = bol - start + match.rm_so + 1;
if (opt->only_matching)
show_line_header(opt, name, lno, cno, sign);
else
@ -1294,7 +1296,6 @@ static void show_line(struct grep_opt *opt,
if (opt->only_matching)
opt->output(opt, "\n", 1);
bol += match.rm_eo;
cno += match.rm_eo;
rest -= match.rm_eo;
eflags = REG_NOTBOL;
}

6
t/t7810-grep.sh
View File

@ -322,11 +322,11 @@ do
${HC}file:1:5:mmap
${HC}file:2:5:mmap
${HC}file:3:5:mmap
${HC}file:3:13:mmap
${HC}file:3:14:mmap
${HC}file:4:5:mmap
${HC}file:4:13:mmap
${HC}file:4:14:mmap
${HC}file:5:5:mmap
${HC}file:5:13:mmap
${HC}file:5:14:mmap
EOF
git grep --column -n -o -e mmap $H >actual &&
test_cmp expected actual