Subject: [PATCH v2 05/12] diff: refactor output of incomplete line

From: Junio C Hamano <[email-masked]>
Date: Wed, 5 Nov 2025 13:30:45 -0800

Create a helper function that reacts to "\ No newline at the end of
file" in preparation for unifying the incomplete line handling in
the code path that handles xdiff output and the code path that
bypasses xdiff and produces complete rewrite patch.

Signed-off-by: Junio C Hamano <[email-masked]>
---
 diff.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/diff.c b/diff.c
index e73320dfb1..d388d318e4 100644
--- a/diff.c
+++ b/diff.c
@@ -1379,6 +1379,10 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
 		emit_line(o, "", "", line, len);
 		break;
 	case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
+		set = diff_get_color_opt(o, DIFF_CONTEXT);
+		reset = diff_get_color_opt(o, DIFF_RESET);
+		emit_line(o, set, reset, line, len);
+		break;
 	case DIFF_SYMBOL_CONTEXT_MARKER:
 		context = diff_get_color_opt(o, DIFF_CONTEXT);
 		reset = diff_get_color_opt(o, DIFF_RESET);
@@ -1668,6 +1672,13 @@ static void emit_context_line(struct emit_callback *ecbdata,
 	emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
 }
 
+static void emit_incomplete_line(struct emit_callback *ecbdata,
+				 const char *line, int len)
+{
+	emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
+			 line, len, 0);
+}
+
 static void emit_hunk_header(struct emit_callback *ecbdata,
 			     const char *line, int len)
 {
@@ -2442,8 +2453,7 @@ static int fn_out_consume(void *priv, char *line, unsigned long len)
 			BUG("fn_out_consume: '\\No newline' after unknown line (%c)",
 			    ecbdata->last_line_kind);
 		}
-		emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
-				 line, len, 0);
+		emit_incomplete_line(ecbdata, line, len);
 		break;
 	default:
 		BUG("fn_out_consume: unknown line '%s'", line);
-- 
2.52.0-rc0-105-gc08128fbb6