[PATCH v2 05/13] diff: allow diff_warn_rename_limit to write somewhere besides stdout

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

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

diff_warn_rename_limit() is hardcoded to write to stdout.  Make it
accept an output location parameter to make it more flexible.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Elijah Newren <newren@gmail.com>
---
 diff.c            | 20 ++++++++++++++------
 diff.h            |  3 ++-
 merge-ort.c       |  2 +-
 merge-recursive.c |  3 ++-
 4 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/diff.c b/diff.c
index 1bfb01c18ec..6952035046f 100644
--- a/diff.c
+++ b/diff.c
@@ -6377,17 +6377,25 @@ static const char rename_limit_advice[] =
 N_("you may want to set your %s variable to at least "
    "%d and retry the command.");
 
-void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
+void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc,
+			    FILE *out)
 {
-	fflush(stdout);
+	const char *fmt = NULL;
+
 	if (degraded_cc)
-		warning(_(degrade_cc_to_c_warning));
+		fmt = _(degrade_cc_to_c_warning);
 	else if (needed)
-		warning(_(rename_limit_warning));
+		fmt = _(rename_limit_warning);
 	else
 		return;
 	if (0 < needed)
-		warning(_(rename_limit_advice), varname, needed);
+		fmt = _(rename_limit_advice);
+
+	fflush(out);
+	if (out == stdout)
+		warning(fmt, varname, needed);
+	else
+		fprintf(out, fmt, varname, needed);
 }
 
 static void create_filepairs_for_header_only_notifications(struct diff_options *o)
@@ -6870,7 +6878,7 @@ int diff_result_code(struct diff_options *opt, int status)
 
 	diff_warn_rename_limit("diff.renameLimit",
 			       opt->needed_rename_limit,
-			       opt->degraded_cc_to_c);
+			       opt->degraded_cc_to_c, stdout);
 	if (!opt->flags.exit_with_status &&
 	    !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
 		return status;
diff --git a/diff.h b/diff.h
index ce9e2cf2e4f..40c5b78fb0a 100644
--- a/diff.h
+++ b/diff.h
@@ -597,7 +597,8 @@ void diffcore_fix_diff_index(void);
 int diff_queue_is_empty(struct diff_options *o);
 void diff_flush(struct diff_options*);
 void diff_free(struct diff_options*);
-void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc);
+void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc,
+			    FILE *out);
 
 /* diff-raw status letters */
 #define DIFF_STATUS_ADDED		'A'
diff --git a/merge-ort.c b/merge-ort.c
index 9bf15a01db8..65618048b59 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -4305,7 +4305,7 @@ void merge_switch_to_result(struct merge_options *opt,
 
 		/* Also include needed rename limit adjustment now */
 		diff_warn_rename_limit("merge.renamelimit",
-				       opti->renames.needed_limit, 0);
+				       opti->renames.needed_limit, 0, stdout);
 
 		trace2_region_leave("merge", "display messages", opt->repo);
 	}
diff --git a/merge-recursive.c b/merge-recursive.c
index 9ec1e6d043a..d2eeca9fa20 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3738,7 +3738,8 @@ static void merge_finalize(struct merge_options *opt)
 		strbuf_release(&opt->obuf);
 	if (show(opt, 2))
 		diff_warn_rename_limit("merge.renamelimit",
-				       opt->priv->needed_rename_limit, 0);
+				       opt->priv->needed_rename_limit, 0,
+				       stdout);
 	FREE_AND_NULL(opt->priv);
 }
 
-- 
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