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/
☄
next prev 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
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