[PATCH 1/1] rebase: deprecate --preserve-merges

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

We have something much better now: --rebase-merges (which is a
complete re-design --preserve-merges, with a lot of issues fixed such as
the inability to reorder commits with --preserve-merges).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 Documentation/config/branch.txt |  6 +++---
 Documentation/config/pull.txt   |  6 +++---
 Documentation/git-rebase.txt    | 23 ++++++++++++-----------
 builtin/rebase.c                |  8 ++++++--
 git-rebase--preserve-merges.sh  |  2 ++
 5 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/Documentation/config/branch.txt b/Documentation/config/branch.txt
index 019d60ede2..8f4b3faadd 100644
--- a/Documentation/config/branch.txt
+++ b/Documentation/config/branch.txt
@@ -85,9 +85,9 @@ When `merges`, pass the `--rebase-merges` option to 'git rebase'
 so that the local merge commits are included in the rebase (see
 linkgit:git-rebase[1] for details).
 +
-When preserve, also pass `--preserve-merges` along to 'git rebase'
-so that locally committed merge commits will not be flattened
-by running 'git pull'.
+When `preserve` (deprecated in favor of `merges`), also pass
+`--preserve-merges` along to 'git rebase' so that locally committed merge
+commits will not be flattened by running 'git pull'.
 +
 When the value is `interactive`, the rebase is run in interactive mode.
 +
diff --git a/Documentation/config/pull.txt b/Documentation/config/pull.txt
index bb23a9947d..b87cab31b3 100644
--- a/Documentation/config/pull.txt
+++ b/Documentation/config/pull.txt
@@ -18,9 +18,9 @@ When `merges`, pass the `--rebase-merges` option to 'git rebase'
 so that the local merge commits are included in the rebase (see
 linkgit:git-rebase[1] for details).
 +
-When preserve, also pass `--preserve-merges` along to 'git rebase'
-so that locally committed merge commits will not be flattened
-by running 'git pull'.
+When `preserve` (deprecated in favor of `merges`), also pass
+`--preserve-merges` along to 'git rebase' so that locally committed merge
+commits will not be flattened by running 'git pull'.
 +
 When the value is `interactive`, the rebase is run in interactive mode.
 +
diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index 5629ba4c5d..89202dbb93 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -415,9 +415,9 @@ i.e. commits that would be excluded by gitlink:git-log[1]'s
 the `rebase-cousins` mode is turned on, such commits are instead rebased
 onto `<upstream>` (or `<onto>`, if specified).
 +
-The `--rebase-merges` mode is similar in spirit to `--preserve-merges`, but
-in contrast to that option works well in interactive rebases: commits can be
-reordered, inserted and dropped at will.
+The `--rebase-merges` mode is similar in spirit to the deprecated
+`--preserve-merges`, but in contrast to that option works well in interactive
+rebases: commits can be reordered, inserted and dropped at will.
 +
 It is currently only possible to recreate the merge commits using the
 `recursive` merge strategy; Different merge strategies can be used only via
@@ -427,9 +427,10 @@ See also REBASING MERGES and INCOMPATIBLE OPTIONS below.
 
 -p::
 --preserve-merges::
-	Recreate merge commits instead of flattening the history by replaying
-	commits a merge commit introduces. Merge conflict resolutions or manual
-	amendments to merge commits are not preserved.
+	[DEPRECATED: use --rebase-merges instead] Recreate merge commits
+	instead of flattening the history by replaying commits a merge commit
+	introduces. Merge conflict resolutions or manual amendments to merge
+	commits are not preserved.
 +
 This uses the `--interactive` machinery internally, but combining it
 with the `--interactive` option explicitly is generally not a good
@@ -1020,11 +1021,11 @@ merge cmake
 
 BUGS
 ----
-The todo list presented by `--preserve-merges --interactive` does not
-represent the topology of the revision graph.  Editing commits and
-rewording their commit messages should work fine, but attempts to
-reorder commits tend to produce counterintuitive results. Use
-`--rebase-merges` in such scenarios instead.
+The todo list presented by the deprecated `--preserve-merges --interactive`
+does not represent the topology of the revision graph (use `--rebase-merges`
+instead).  Editing commits and rewording their commit messages should work
+fine, but attempts to reorder commits tend to produce counterintuitive results.
+Use `--rebase-merges` in such scenarios instead.
 
 For example, an attempt to rearrange
 ------------
diff --git a/builtin/rebase.c b/builtin/rebase.c
index 7c7bc13e91..c5f5edf321 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1092,8 +1092,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
 			parse_opt_interactive },
 		OPT_SET_INT('p', "preserve-merges", &options.type,
-			    N_("try to recreate merges instead of ignoring "
-			       "them"), REBASE_PRESERVE_MERGES),
+			    N_("(DEPRECATED) try to recreate merges instead of "
+			       "ignoring them"), REBASE_PRESERVE_MERGES),
 		OPT_BOOL(0, "rerere-autoupdate",
 			 &options.allow_rerere_autoupdate,
 			 N_("allow rerere to update index with resolved "
@@ -1204,6 +1204,10 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		usage_with_options(builtin_rebase_usage,
 				   builtin_rebase_options);
 
+	if (options.type == REBASE_PRESERVE_MERGES)
+		warning(_("--preserve-merges is deprecated in favor of "
+			  "--rebase-merges"));
+
 	if (action != NO_ACTION && !in_progress)
 		die(_("No rebase in progress?"));
 	setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
diff --git a/git-rebase--preserve-merges.sh b/git-rebase--preserve-merges.sh
index afbb65765d..eab2e40dc6 100644
--- a/git-rebase--preserve-merges.sh
+++ b/git-rebase--preserve-merges.sh
@@ -105,6 +105,8 @@ warn () {
 	printf '%s\n' "$*" >&2
 }
 
+warn "git rebase --preserve-merges is deprecated. Use --rebase-merges instead."
+
 # Output the commit message for the specified commit.
 commit_message () {
 	git cat-file commit "$1" | sed "1,/^$/d"
-- 
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