Fix long standing inconsistency between -c/--cc that do imply -p, on
one side, and -m that did not imply -p, on the other side.
Change corresponding test accordingly, as "log -m" output should now
match one from "log -m -p", rather than from just "log".
Change documentation accordingly.
NOTES:
After this patch
git log -m
will start to produce diffs without need to provide -p as well, that
improves both consistency and usability. It gets even more useful if
one sets "log.diffMerges" configuration variable to "first-parent" to
force -m produce usual diff with respect to first parent only.
This patch does not change behavior when specific diff format is
explicitly provided on the command-line, so that commands like
git log -m --raw
git log -m --stat
are not affected.
Exact historical semantics of -m is still provided by
--diff-merges=separate.
Signed-off-by: Sergey Organov <sorganov@xxxxxxxxx>
---
Documentation/diff-options.txt | 8 ++++----
diff-merges.c | 1 +
t/t4013-diff-various.sh | 4 ++--
3 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 530d1159141f..32e6dee5ac3b 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -49,10 +49,9 @@ ifdef::git-log[]
--diff-merges=m:::
-m:::
This option makes diff output for merge commits to be shown in
- the default format. `-m` will produce the output only if `-p`
- is given as well. The default format could be changed using
+ the default format. The default format could be changed using
`log.diffMerges` configuration parameter, which default value
- is `separate`.
+ is `separate`. `-m` implies `-p`.
+
--diff-merges=first-parent:::
--diff-merges=1:::
@@ -62,7 +61,8 @@ ifdef::git-log[]
--diff-merges=separate:::
This makes merge commits show the full diff with respect to
each of the parents. Separate log entry and diff is generated
- for each parent.
+ for each parent. This is the format that `-m` produced
+ historically.
+
--diff-merges=combined:::
--diff-merges=c:::
diff --git a/diff-merges.c b/diff-merges.c
index d897fd8a2933..0dfcaa1b11b0 100644
--- a/diff-merges.c
+++ b/diff-merges.c
@@ -107,6 +107,7 @@ int diff_merges_parse_opts(struct rev_info *revs, const char **argv)
if (!strcmp(arg, "-m")) {
set_to_default(revs);
+ revs->merges_imply_patch = 1;
} else if (!strcmp(arg, "-c")) {
set_combined(revs);
revs->merges_imply_patch = 1;
diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index c35cc73d08bd..15ca3c75bff7 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -454,8 +454,8 @@ diff-tree --stat --compact-summary initial mode
diff-tree -R --stat --compact-summary initial mode
EOF
-test_expect_success 'log -m matches pure log' '
- git log master >result &&
+test_expect_success 'log -m matches log -m -p' '
+ git log -m -p master >result &&
process_diffs result >expected &&
git log -m >result &&
process_diffs result >actual &&
--
2.25.1
