bug#16938: 24.3.50; Support the Dash shell shebang and .[bd]sh file types

bug#16938: 24.3.50; Support the Dash shell shebang and .[bd]sh file types

[John Yates]

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#!/bin/sh is interpreted inconsistently across platforms.  In the rpm
world it most often maps to /bin/bash.  In the Debian universe it maps
to /bin/dash.  Bash and dash have subtle differences that have bitten
me often enough to cause me now to use precise shebangs (#!/bin/bash or
#!/bin/dash) and to suffix my files with either .bsh or .dsh.

At present emacs' interpreter-mode-alist knows nothing about dash and
its auto-mode-alist is ignorant of both the .bsh and .dsh suffixes.

For interpreter-mode-alist I suggest adding the follow entry:

     ("dash" . sh-mode)


For auto-mode-alist I suggest changing the follow entry:

     ("\\.[ck]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)

to

     ("\\.[bcdk]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)

/john

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bug#16938: 24.3.50; Support the Dash shell shebang and .[bd]sh file types

[Glenn Morris]

John Yates wrote:

> For interpreter-mode-alist I suggest adding the follow entry:
>
>      ("dash" . sh-mode)

Sounds good.

> For auto-mode-alist I suggest changing the follow entry:
>
>      ("\\.[ck]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)
>
> to
>
>      ("\\.[bcdk]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)

I've never come across .bsh and .dsh used as extensions in this way.
I find zero examples on two random RHEL6, Debian testing machines.
The only .bsh files are LibreOffice components that are not bash scripts.
So this seems like something for your personal .emacs.

bug#16938: 24.3.50; Support the Dash shell shebang and .[bd]sh file types

[John Yates]

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Hi Glenn,

Thanks for the quick reply.

On Tue, Mar 4, 2014 at 9:47 PM, Glenn Morris <rgm@gnu.org> wrote:

> >      ("dash" . sh-mode)
>
> Sounds good.
>

That's the one that really matters to me as many (most?) of my scripts have
no file extension.

I've never come across .bsh and .dsh used as extensions in this way.
> I find zero examples on two random RHEL6, Debian testing machines.
> The only .bsh files are LibreOffice components that are not bash scripts.
> So this seems like something for your personal .emacs.
>

I guess I suggested .bsh and .dsh for completeness.  My first encounter
with .bsh was on my newest job.  I introduced .dsh once I started using a
#!/bin/dash shebang.  Given that you found a LibreOffice conflict I am
happy to withdraw my suggestion.

/john

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bug#16938: 24.3.50; Support the Dash shell shebang and .[bd]sh file types

[Glenn Morris]

Version: 24.4

Glenn Morris wrote:

>> For interpreter-mode-alist I suggest adding the follow entry:
>>
>>      ("dash" . sh-mode)

Added.