From 5e244e724f7990436d5ec099abab780d9317b6d1 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 7 Jan 2025 04:06:35 +0900
Subject: [PATCH] pretty-print: make cat_file() also highlight the trailing
 backslash for line continuation

---
 src/shared/pretty-print.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/shared/pretty-print.c b/src/shared/pretty-print.c
index e7360352b3..4eb4858931 100644
--- a/src/shared/pretty-print.c
+++ b/src/shared/pretty-print.c
@@ -250,13 +250,23 @@ static int cat_file(const char *filename, bool newline, CatFlags flags) {
 
                 /* Check if the line ends with a backslash. */
                 bool escaped = false;
-                for (const char *e = line; *e != '\0'; e++) {
+                char *e;
+                for (e = line; *e != '\0'; e++) {
                         if (escaped)
                                 escaped = false;
                         else if (*e == '\\')
                                 escaped = true;
                 }
 
+                /* Highlight the trailing backslash. */
+                if (escaped) {
+                        assert(e > line);
+                        *(e-1) = '\0';
+
+                        if (!strextend(&line, ansi_highlight_red(), "\\", ansi_normal()))
+                                return log_oom();
+                }
+
                 /* Highlight the left side (directive) of a Foo=bar assignment */
                 if (FLAGS_SET(flags, CAT_FORMAT_HAS_SECTIONS) && !continued) {
                         const char *p = strchr(line, '=');