Re: Incorrect syntax highlight of things like '\r' within EOF block in bash script

On Wed, Jul 17, 2013 at 3:09 PM, Adnan Zafar <adnanjzafar@gmail.com> wrote:
> On Wed, Jul 17, 2013 at 4:02 PM, Peng Yu <pengyu.ut@gmail.com> wrote:
>> Hi,
>>
>> vim can not syntax highlight the following script correctly. Does
>> anybody know a better highlight plugin that can correct highlight it?
>> Thanks.
>>
>> ~/linux/test/latex/tex/bin$ cat main.sh
>> #!/usr/bin/env bash
>>
>> tex <<EOF
>> \relax
>> Hello?
>> \end
>> EOF
>>
>> --
>> Regards,
>> Peng
>
> Inside of heredocs, bash (and other shells) can do certain expansions
> and substutions, so the Vim syntax highlights for those. However if
> the delimiter word (here EOF) is quoted in some way, like \EOF then
> those expansions and substitutions are disabled, and Vim's syntax
> adjusts accordingly.
>
> In short either escape backslashes inside the heredoc or simply use
>
> tex << \EOF
> \relax
> Hello?
> \end
> EOF

The following is the document from bash. I don't see the usage of
\EOF. Do you know where it is documented? I tried both \EOF and EOF,
both of them generate the same dvi file. So it seems \r and \e are
take literally by tex (i.e., a backslash and 'r', a backslash and
'e'). Is it so?

Here Documents
This type of redirection instructs the shell to read input from the
current source until a line containing only delimiter (with no trailing
blanks) is seen. All of the lines read up to that point are then used
as the standard input for a command.

The format of here-documents is:

<<[-]word
here-document
delimiter

No parameter expansion, command substitution, arithmetic expansion, or
pathname expansion is performed on word. If any characters in word are
quoted, the delimiter is the result of quote removal on word, and the
lines in the here-document are not expanded. If word is unquoted, all
lines of the here-document are subjected to parameter expansion, com-
mand substitution, and arithmetic expansion. In the latter case, the
character sequence \<newline> is ignored, and \ must be used to quote
the characters \, $, and `.

If the redirection operator is <<-, then all leading tab characters are
stripped from input lines and the line containing delimiter. This
allows here-documents within shell scripts to be indented in a natural
fashion.


--
Regards,
Peng

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