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Emacs 24.1 introduced the notion of "basic major modes" and among these
is prog-mode, see section "23.2.5 Basic Major Modes" in the Emacs
manual. The prog-mode basic major mode is recommended as a base for
derived major modes that are intended for editing source code.
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- Use define-derived-mode to declare nix-mode
- Use autoloads to ensure nix-mode is usable (and enabled) without needing `require`
- Use set + make-local-variable instead of longer 2-step equivalent
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Signed-off-by: Ricky Elrod <ricky@elrod.me>
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In Nixpkgs, the attribute in all-packages.nix corresponding to a
package is usually equal to the package name. However, this doesn't
work if the package contains a dash, which is fairly common. The
convention is to replace the dash with an underscore (e.g. "dbus-lib"
becomes "dbus_glib"), but that's annoying. So now dashes are valid in
variable / attribute names, allowing you to write:
dbus-glib = callPackage ../development/libraries/dbus-glib { };
and
buildInputs = [ dbus-glib ];
Since we don't have a negation or subtraction operation in Nix, this
is unambiguous.
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x.y.z or default
(as originally proposed in
https://mail.cs.uu.nl/pipermail/nix-dev/2009-September/002989.html).
For instance, an expression like
stdenv.lib.attrByPath ["features" "ckSched"] false args
can now be written as
args.features.ckSched or false
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this enables (require 'nix-mode)
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much as possible. (This is similar to GNU Make's `-k' flag.)
* Refactoring to implement this: previously we just bombed out when
a build failed, but now we have to clean up. In particular this
means that goals must be freed quickly --- they shouldn't hang
around until the worker exits. So the worker now maintains weak
pointers in order not to prevent garbage collection.
* Documented the `-k' and `-j' flags.
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