[PATCH v2 3/3] kconfig: show continuation at the end of wrapped lines

[Julian Braha <julianbraha@gmail.com>]

Add a visible continuation '\' to the end of each wrapped line.
This is because some line wraps are not otherwise obvious to the reader,
for example if a line ends with a symbol name instead of an operator.
(Below example uses an 80-column terminal)

Here, it would be less obvious without '\' (GPIO_TQMX86):
    Depends on: GPIOLIB [=y] && (MFD_TQMX86 [=y] || COMPILE_TEST [=y]) \  
                && HAS_IOPORT_MAP [=y]

Signed-off-by: Julian Braha <julianbraha@gmail.com>
---
 scripts/kconfig/expr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index 0b3f2d7bc809..a539b617b62f 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -1167,12 +1167,15 @@ static void expr_print_gstr_helper(void *data, struct symbol *sym, const char *s
 		if (sym_str && sym->type != S_UNKNOWN)
 			extra_length += 4 + strlen(sym_str);
 
+		extra_length += strlen(" \\");
 		last_line_length = strlen(last_cr ? last_cr + 1 : gs->s);
 
 		if (last_line_length > gs->indent + prefix_len &&
 		    last_line_length + extra_length > gs->max_width) {
 			gs->s[gs->wrap_pos] = '\0';
-			str_printf(gs, "\n%*s", gs->indent, "");
+			if (gs->s[gs->wrap_pos - 1] != ' ')
+				str_append(gs, " ");
+			str_printf(gs, "\\\n%*s", gs->indent, "");
 			while (prefix_len--)
 				str_append(gs, "!");
 			if (!sym)
-- 
2.56.0