unofficial mirror of help-gnu-emacs@gnu.org
 help / color / mirror / Atom feed
From: Xah <xahlee@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: How to open a file in sh-mode
Date: Thu, 14 Aug 2008 03:29:15 -0700 (PDT)	[thread overview]
Message-ID: <64d8ebaf-0c89-4e9d-9aee-86b4e9414449@o40g2000prn.googlegroups.com> (raw)
In-Reply-To: mailman.16658.1218700648.18990.help-gnu-emacs@gnu.org

On Aug 14, 12:53 am, "Francis Moreau" <francis.m...@gmail.com> wrote:
> Hello,
>
> I'm trying to open a file with emacs automatically set on sh-mode.
> The file name can't be used to guess that emacs should be in sh-mode
> when opening it.

If the file content's first line starts with “#!”, then you could use
the magic-mode-alist.

-----------------------------------
How Emacs Choose Modes

Emacs determines what mode to use primarily by 2 mechanisms, in order:
(1) Check the first line in the file, using “magic-mode-alist”. (2)
Check the file name's suffix, using “auto-mode-alist”.

The “magic-mode-alist” is a list that emacs use to match the first
line of a file with a mode. For example, if you want files that begin
with the line “<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 ...” to
always use nxml-mode, then add the following to your “.emacs”:

(add-to-list
 'magic-mode-alist
 '("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0" . nxml-mode))

The magic-mode-alist is a list. In the above example, the string with
the “DOCTYPE” is a regex, used to match the first line of a file.

If emacs goes thru magic-mode-alist and didn't find any match, then
it'll use auto-mode-alist to check on file name suffix. The “auto-mode-
alist” associates a file name suffix with a mode. For example, if you
want files ending in “.js” to always open with js2-mode, then do:

(add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode))

Note: The double backslash in the string “\\.js\\'” is used to escape
the backslash. So, the regex engine just got “\.js\'”. The “\.” is to
match a period. The “\'” is one of emacs special regex syntax, to
match end of a string. (See also: Text Pattern Matching in Emacs)

Reference: Elisp Manual: Regexp-Backslash.

You can see what are the values of magic-mode-alist or auto-mode-alist
by typing “Alt+x describe-variable”.

There are few minor details about how emacs determines what mode to
load, but the above should cover vast majority of needs. For detail,
see emacs manual.

Reference: (info "(emacs)Choosing Modes").

--------------------------------------------
above from:
http://xahlee.org/emacs/emacs_installing_packages.html

  Xah
∑ http://xahlee.org/

☄


  parent reply	other threads:[~2008-08-14 10:29 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.16658.1218700648.18990.help-gnu-emacs@gnu.org>
2008-08-14  8:28 ` How to open a file in sh-mode Sebastian Kaps
2008-08-14 10:29 ` Xah [this message]
2008-09-11  1:35   ` David Combs
2008-09-11 22:58     ` unicode encoding and curly quotes [was: How to open a file in sh-mode] Xah
2008-09-14 22:35       ` David Combs
2008-09-15 16:28         ` unicode encoding and curly quotes Nikolaj Schumacher
2008-09-15 19:09         ` unicode encoding and curly quotes [was: How to open a file in sh-mode] Xah
2008-09-22 20:17           ` David Combs
2008-08-14  7:53 How to open a file in sh-mode Francis Moreau
2008-08-14  8:16 ` Henrik Austad
2008-08-14  9:03   ` Francis Moreau
2008-08-14 10:03     ` Henrik Austad
2008-08-14 10:06       ` Francis Moreau
2008-08-14 11:17         ` David Hansen
2008-08-14 11:36         ` Henrik Austad
2008-08-14 11:51           ` Francis Moreau
2008-08-14 11:57             ` Lennart Borgman (gmail)
     [not found]       ` <mailman.16667.1218708430.18990.help-gnu-emacs@gnu.org>
2008-08-14 12:24         ` Giorgos Keramidas
2008-08-14 13:01           ` Francis Moreau
2008-08-14 13:27             ` Giorgos Keramidas
2008-08-14 13:48               ` Francis Moreau
2008-08-14 14:23                 ` Giorgos Keramidas
2008-08-14  8:26 ` David Hansen
2008-08-14  9:04   ` Francis Moreau
2008-08-14  9:23     ` Thierry Volpiatto
2008-08-14  9:34       ` Francis Moreau
2008-08-14 10:58     ` Peter Dyballa
2008-08-14 11:02       ` Francis Moreau
2008-08-14 11:20         ` Lennart Borgman (gmail)
2008-08-14 11:36           ` Francis Moreau
2008-08-14 11:46             ` Lennart Borgman (gmail)
2008-08-14 12:06         ` Peter Dyballa
2008-08-14 12:22           ` Francis Moreau

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=64d8ebaf-0c89-4e9d-9aee-86b4e9414449@o40g2000prn.googlegroups.com \
    --to=xahlee@gmail.com \
    --cc=help-gnu-emacs@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).