patch 9.1.0535: newline escape wrong in ex mode
Problem: newline escape wrong in ex mode (Konrad Schwarz)
Solution: partly revert patch 7.3.014, remove backslash in front of a
newline when not in prompt mode in ex line mode
(Mohamed Akram)
This fixes newline escaping to allow passing multiple commands to
":global", multiple lines to shell commands, and ending lines in append
mode with backslashes. This should fix a POSIX/(traditional) VI
incompatiblity.
This reverts a previous incorrect attempt at patch v7.3.014 to fix
append mode which removed half of trailing backslashes which lead to,
eg. the following two commands being parsed as having a different number
of backslashes:
```
!echo foo\\\
```
```
!echo foo\\ \
```
fixes: #6135
fixes: #7244
closes: #15120
Signed-off-by: Mohamed Akram <mohd.akram@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 59d3db4..1dc28bc 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2341,12 +2341,7 @@
{
for (p = ea.arg; *p; ++p)
{
- // Remove one backslash before a newline, so that it's possible to
- // pass a newline to the shell and also a newline that is preceded
- // with a backslash. This makes it impossible to end a shell
- // command in a backslash, but that doesn't appear useful.
- // Halving the number of backslashes is incompatible with previous
- // versions.
+ // Remove one backslash before a newline
if (*p == '\\' && p[1] == '\n')
STRMOVE(p, p + 1);
else if (*p == '\n' && !(ea.argt & EX_EXPR_ARG))