Using --squash made git stop regardless of conflicts so that the
user could finish the operation with a later call to git-commit.

Now --squash allows for the operation to finish with the new revision
if there are no conflicts (can still be controlled with --no-commit).

Option -m can be used to defined the message for the revision instead
of the default message that contains all squashed revisions info.

Signed-off-by: Edmundo Carmona Antoranz <eantor...@gmail.com>
---
 builtin/merge.c | 109 +++++++++++++++++++++++++-----------------------
 1 file changed, 57 insertions(+), 52 deletions(-)

diff --git a/builtin/merge.c b/builtin/merge.c
index aad5a9504c..66fd57de02 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -64,6 +64,7 @@ static int option_edit = -1;
 static int allow_trivial = 1, have_message, verify_signatures;
 static int overwrite_ignore = 1;
 static struct strbuf merge_msg = STRBUF_INIT;
+static struct strbuf squash_msg = STRBUF_INIT;
 static struct strategy **use_strategies;
 static size_t use_strategies_nr, use_strategies_alloc;
 static const char **xopts;
@@ -390,39 +391,38 @@ static void finish_up_to_date(const char *msg)
 static void squash_message(struct commit *commit, struct commit_list 
*remoteheads)
 {
        struct rev_info rev;
-       struct strbuf out = STRBUF_INIT;
        struct commit_list *j;
        struct pretty_print_context ctx = {0};
 
-       printf(_("Squash commit -- not updating HEAD\n"));
-
-       repo_init_revisions(the_repository, &rev, NULL);
-       rev.ignore_merges = 1;
-       rev.commit_format = CMIT_FMT_MEDIUM;
-
-       commit->object.flags |= UNINTERESTING;
-       add_pending_object(&rev, &commit->object, NULL);
-
-       for (j = remoteheads; j; j = j->next)
-               add_pending_object(&rev, &j->item->object, NULL);
-
-       setup_revisions(0, NULL, &rev, NULL);
-       if (prepare_revision_walk(&rev))
-               die(_("revision walk setup failed"));
-
-       ctx.abbrev = rev.abbrev;
-       ctx.date_mode = rev.date_mode;
-       ctx.fmt = rev.commit_format;
-
-       strbuf_addstr(&out, "Squashed commit of the following:\n");
-       while ((commit = get_revision(&rev)) != NULL) {
-               strbuf_addch(&out, '\n');
-               strbuf_addf(&out, "commit %s\n",
-                       oid_to_hex(&commit->object.oid));
-               pretty_print_commit(&ctx, commit, &out);
+       if (merge_msg.len)
+               squash_msg = merge_msg;
+       else {
+               repo_init_revisions(the_repository, &rev, NULL);
+               rev.ignore_merges = 1;
+               rev.commit_format = CMIT_FMT_MEDIUM;
+
+               commit->object.flags |= UNINTERESTING;
+               add_pending_object(&rev, &commit->object, NULL);
+
+               for (j = remoteheads; j; j = j->next)
+                       add_pending_object(&rev, &j->item->object, NULL);
+
+               setup_revisions(0, NULL, &rev, NULL);
+               if (prepare_revision_walk(&rev))
+                       die(_("revision walk setup failed"));
+
+               ctx.abbrev = rev.abbrev;
+               ctx.date_mode = rev.date_mode;
+               ctx.fmt = rev.commit_format;
+
+               strbuf_addstr(&squash_msg, "Squashed commit of the 
following:\n");
+               while ((commit = get_revision(&rev)) != NULL) {
+                       strbuf_addch(&squash_msg, '\n');
+                       strbuf_addf(&squash_msg, "commit %s\n",
+                               oid_to_hex(&commit->object.oid));
+                       pretty_print_commit(&ctx, commit, &squash_msg);
+               }
        }
-       write_file_buf(git_path_squash_msg(the_repository), out.buf, out.len);
-       strbuf_release(&out);
 }
 
 static void finish(struct commit *head_commit,
@@ -440,8 +440,11 @@ static void finish(struct commit *head_commit,
                strbuf_addf(&reflog_message, "%s: %s",
                        getenv("GIT_REFLOG_ACTION"), msg);
        }
-       if (squash) {
+       if (squash && !squash_msg.len) {
                squash_message(head_commit, remoteheads);
+               write_file_buf(git_path_squash_msg(the_repository), 
squash_msg.buf, squash_msg.len);
+               if (option_commit > 0)
+                       printf(_("Squash conflicts -- not updating HEAD\n"));
        } else {
                if (verbosity >= 0 && !merge_msg.len)
                        printf(_("No merge message -- not updating HEAD\n"));
@@ -893,14 +896,23 @@ static int finish_automerge(struct commit *head,
        struct object_id result_commit;
 
        free_commit_list(common);
-       parents = remoteheads;
-       if (!head_subsumed || fast_forward == FF_NO)
-               commit_list_insert(head, &parents);
-       prepare_to_commit(remoteheads);
-       if (commit_tree(merge_msg.buf, merge_msg.len, result_tree, parents,
-                       &result_commit, NULL, sign_commit))
-               die(_("failed to write commit object"));
-       strbuf_addf(&buf, "Merge made by the '%s' strategy.", wt_strategy);
+       if (squash) {
+               squash_message(head, remoteheads);
+               parents = commit_list_insert(head, &parents);
+               if (commit_tree(squash_msg.buf, squash_msg.len, result_tree, 
parents,
+                               &result_commit, NULL, sign_commit))
+                       die(_("failed to write commit object on squash"));
+       } else {
+               parents = remoteheads;
+               if (!head_subsumed || fast_forward == FF_NO)
+                       commit_list_insert(head, &parents);
+               prepare_to_commit(remoteheads);
+               if (commit_tree(merge_msg.buf, merge_msg.len, result_tree, 
parents,
+                               &result_commit, NULL, sign_commit))
+                       die(_("failed to write commit object"));
+       }
+       strbuf_addf(&buf, "Merge made by the '%s' strategy", wt_strategy);
+       strbuf_addstr(&buf, squash ? " (squashed)." : ".");
        finish(head, remoteheads, &result_commit, buf.buf);
        strbuf_release(&buf);
        remove_merge_branch_state(the_repository);
@@ -1342,18 +1354,8 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
        if (verbosity < 0)
                show_diffstat = 0;
 
-       if (squash) {
-               if (fast_forward == FF_NO)
-                       die(_("You cannot combine --squash with --no-ff."));
-               if (option_commit > 0)
-                       die(_("You cannot combine --squash with --commit."));
-               /*
-                * squash can now silently disable option_commit - this is not
-                * a problem as it is only overriding the default, not a user
-                * supplied option.
-                */
-               option_commit = 0;
-       }
+       if (squash && fast_forward == FF_NO)
+               die(_("You cannot combine --squash with --no-ff."));
 
        if (option_commit < 0)
                option_commit = 1;
@@ -1682,8 +1684,11 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
                write_merge_state(remoteheads);
 
        if (merge_was_ok)
-               fprintf(stderr, _("Automatic merge went well; "
-                       "stopped before committing as requested\n"));
+               if (!option_commit)
+                       fprintf(stderr, _("Automatic merge went well; "
+                               "stopped before committing as requested\n"));
+               else
+                       ;
        else
                ret = suggest_conflicts();
 
-- 
2.20.1

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