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nixpkgs-suyu/pkgs/build-support/emacs/wrapper.sh

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emacsWithPackages: mutate EMACSLOADPATH correctly An empty entry in EMACSLOADPATH gets filled with the default value. This is presumably why the wrapper inserted a colon after the entry it added for the dependencies. But this naive approach wasn't always correct. For example, if the user ran emacs with EMACSLOADPATH=foo, the wrapper would insert the default value (by adding the trailing `:') even though the user was trying to expressly opt out of it. To do this correctly, here I've replaced makeWrapper with a bespoke script that will actually parse the EMACSLOADPATH provided in the environment (if given), and insert the wrapper's load path just before the default value. If EMACSLOADPATH is given but contains no default value, we respect that and don't add the wrapped dependencies at all. If no EMACSLOADPATH is given, we insert the wrapped dependencies before the default value, just like before. In this way, the wrapped Emacs should now behave as if the wrapped dependencies were part of Emacs's default load-path value.
2020-12-09 16:53:10 +01:00
#!@bash@
IFS=:
newLoadPath=()
emacs: Add comp-eln-load-path infrastructure
2020-11-16 20:24:29 +01:00
newNativeLoadPath=()
emacsWithPackages: mutate EMACSLOADPATH correctly An empty entry in EMACSLOADPATH gets filled with the default value. This is presumably why the wrapper inserted a colon after the entry it added for the dependencies. But this naive approach wasn't always correct. For example, if the user ran emacs with EMACSLOADPATH=foo, the wrapper would insert the default value (by adding the trailing `:') even though the user was trying to expressly opt out of it. To do this correctly, here I've replaced makeWrapper with a bespoke script that will actually parse the EMACSLOADPATH provided in the environment (if given), and insert the wrapper's load path just before the default value. If EMACSLOADPATH is given but contains no default value, we respect that and don't add the wrapped dependencies at all. If no EMACSLOADPATH is given, we insert the wrapped dependencies before the default value, just like before. In this way, the wrapped Emacs should now behave as if the wrapped dependencies were part of Emacs's default load-path value.
2020-12-09 16:53:10 +01:00
added=
if [[ -n $EMACSLOADPATH ]]
then
while read -rd: entry
do
if [[ -z $entry && -z $added ]]
then
newLoadPath+=(@wrapperSiteLisp@)
added=1
fi
newLoadPath+=("$entry")
done <<< "$EMACSLOADPATH:"
else
newLoadPath+=(@wrapperSiteLisp@)
newLoadPath+=("")
fi
emacs: Add comp-eln-load-path infrastructure
2020-11-16 20:24:29 +01:00
if [[ -n $EMACSNATIVELOADPATH ]]
then
while read -rd: entry
do
if [[ -z $entry && -z $added ]]
then
newNativeLoadPath+=(@wrapperSiteLispNative@)
added=1
fi
newNativeLoadPath+=("$entry")
done <<< "$EMACSNATIVELOADPATH:"
else
newNativeLoadPath+=(@wrapperSiteLispNative@)
newNativeLoadPath+=("")
fi
emacsWithPackages: mutate EMACSLOADPATH correctly An empty entry in EMACSLOADPATH gets filled with the default value. This is presumably why the wrapper inserted a colon after the entry it added for the dependencies. But this naive approach wasn't always correct. For example, if the user ran emacs with EMACSLOADPATH=foo, the wrapper would insert the default value (by adding the trailing `:') even though the user was trying to expressly opt out of it. To do this correctly, here I've replaced makeWrapper with a bespoke script that will actually parse the EMACSLOADPATH provided in the environment (if given), and insert the wrapper's load path just before the default value. If EMACSLOADPATH is given but contains no default value, we respect that and don't add the wrapped dependencies at all. If no EMACSLOADPATH is given, we insert the wrapped dependencies before the default value, just like before. In this way, the wrapped Emacs should now behave as if the wrapped dependencies were part of Emacs's default load-path value.
2020-12-09 16:53:10 +01:00
export EMACSLOADPATH="${newLoadPath[*]}"
emacsWithPackages: don't tell sub-Emacs about pkgs If I'm running an Emacs executable from emacsWithPackages as my main programming environment, and I'm hacking on Emacs, or the Emacs packaging in Nixpkgs, or whatever, I don't want the Emacs packages from the wrapper to show up in the load path of that child Emacs. It results in differing behaviour depending on whether the child Emacs is run from Emacs or from, for example, an external terminal emulator, which is very surprising. To avoid this, pass another environment variable containing the wrapper site-lisp path, and use that value to remove the corresponding entry in EMACSLOADPATH, so it won't be propagated to child Emacsen.
2020-12-07 19:53:54 +01:00
export emacsWithPackages_siteLisp=@wrapperSiteLisp@
emacsWithPackages: mutate EMACSLOADPATH correctly An empty entry in EMACSLOADPATH gets filled with the default value. This is presumably why the wrapper inserted a colon after the entry it added for the dependencies. But this naive approach wasn't always correct. For example, if the user ran emacs with EMACSLOADPATH=foo, the wrapper would insert the default value (by adding the trailing `:') even though the user was trying to expressly opt out of it. To do this correctly, here I've replaced makeWrapper with a bespoke script that will actually parse the EMACSLOADPATH provided in the environment (if given), and insert the wrapper's load path just before the default value. If EMACSLOADPATH is given but contains no default value, we respect that and don't add the wrapped dependencies at all. If no EMACSLOADPATH is given, we insert the wrapped dependencies before the default value, just like before. In this way, the wrapped Emacs should now behave as if the wrapped dependencies were part of Emacs's default load-path value.
2020-12-09 16:53:10 +01:00
emacs: Add comp-eln-load-path infrastructure
2020-11-16 20:24:29 +01:00
export EMACSNATIVELOADPATH="${newNativeLoadPath[*]}"
export emacsWithPackages_siteLispNative=@wrapperSiteLispNative@
emacsWrapper: preload autoloads This commits changes the Emacs wrapper, in order to preload all autoload definitions when built with additional packages. The list of all definitions is generated at build-time. Packages do not need to be (require)d for them to work. Before this change, a code like ```sh nix-shell -I "nixpkgs=$PWD" -p "emacs.pkgs.withPackages(e:[e.magit])" \ --run "emacs -Q -nw -f magit" ``` will fail with the message `Symbol’s function definition is void: magit` After the change, the same code above will open Emacs with magit enabled. A slightly longer startup time of ~10ms was detected in local, informal experiments. More information on autoloading: https://www.gnu.org/software/emacs/manual/html_node/eintr/Autoload.html
2022-04-03 19:28:23 +02:00
exec @prog@ -l cl-loaddefs -l nix-generated-autoload "$@"
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