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patch 9.1.0535: newline escape wrong in ex mode

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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>
This commit is contained in:
Mohamed Akram
2024-07-06 17:12:09 +02:00
committed by Christian Brabandt
parent 84ca1388d8
commit f3daa4525b
4 changed files with 53 additions and 41 deletions
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7
src/ex_docmd.c
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@@ -2341,12 +2341,7 @@ do_one_cmd(
{
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))