Merge pull request #7798 from peeley/list-experimental-features
Documentation: list experimental features in manual
This commit is contained in:
Eelco Dolstra
GitHub
commit
60a1bf08b6
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@ -19,9 +19,12 @@ perl/Makefile.config
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/doc/manual/nix.json
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/doc/manual/conf-file.json
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/doc/manual/builtins.json
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/doc/manual/xp-features.json
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/doc/manual/src/SUMMARY.md
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/doc/manual/src/command-ref/new-cli
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/doc/manual/src/command-ref/conf-file.md
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/doc/manual/src/command-ref/experimental-features-shortlist.md
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/doc/manual/src/contributing/experimental-feature-descriptions.md
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/doc/manual/src/language/builtins.md
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# /scripts/
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@ -0,0 +1,9 @@
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with builtins;
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with import ./utils.nix;
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let
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showExperimentalFeature = name: doc:
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''
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- [`${name}`](@docroot@/contributing/experimental-features.md#xp-feature-${name})
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'';
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in xps: indent " " (concatStrings (attrValues (mapAttrs showExperimentalFeature xps)))
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@ -0,0 +1,11 @@
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with builtins;
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with import ./utils.nix;
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let
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showExperimentalFeature = name: doc:
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squash ''
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## [`${name}`]{#xp-feature-${name}}
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${doc}
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'';
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in xps: (concatStringsSep "\n" (attrValues (mapAttrs showExperimentalFeature xps)))
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@ -81,19 +81,20 @@ $(d)/%.8: $(d)/src/command-ref/%.md
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$(d)/nix.conf.5: $(d)/src/command-ref/conf-file.md
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@printf "Title: %s\n\n" "$$(basename $@ .5)" > $^.tmp
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@cat $^ >> $^.tmp
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@$(call process-includes,$^,$^.tmp)
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$(trace-gen) lowdown -sT man --nroff-nolinks -M section=5 $^.tmp -o $@
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@rm $^.tmp
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$(d)/src/SUMMARY.md: $(d)/src/SUMMARY.md.in $(d)/src/command-ref/new-cli
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$(d)/src/SUMMARY.md: $(d)/src/SUMMARY.md.in $(d)/src/command-ref/new-cli $(d)/src/contributing/experimental-feature-descriptions.md
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@cp $< $@
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@$(call process-includes,$@,$@)
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$(d)/src/command-ref/new-cli: $(d)/nix.json $(d)/generate-manpage.nix $(bindir)/nix
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$(d)/src/command-ref/new-cli: $(d)/nix.json $(d)/utils.nix $(d)/generate-manpage.nix $(bindir)/nix
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@rm -rf $@ $@.tmp
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$(trace-gen) $(nix-eval) --write-to $@.tmp --expr 'import doc/manual/generate-manpage.nix (builtins.readFile $<)'
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@mv $@.tmp $@
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$(d)/src/command-ref/conf-file.md: $(d)/conf-file.json $(d)/utils.nix $(d)/src/command-ref/conf-file-prefix.md $(bindir)/nix
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$(d)/src/command-ref/conf-file.md: $(d)/conf-file.json $(d)/utils.nix $(d)/src/command-ref/conf-file-prefix.md $(d)/src/command-ref/experimental-features-shortlist.md $(bindir)/nix
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@cat doc/manual/src/command-ref/conf-file-prefix.md > $@.tmp
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$(trace-gen) $(nix-eval) --expr '(import doc/manual/utils.nix).showSettings { useAnchors = true; } (builtins.fromJSON (builtins.readFile $<))' >> $@.tmp;
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@mv $@.tmp $@
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@ -106,6 +107,20 @@ $(d)/conf-file.json: $(bindir)/nix
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$(trace-gen) $(dummy-env) $(bindir)/nix show-config --json --experimental-features nix-command > $@.tmp
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@mv $@.tmp $@
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$(d)/src/contributing/experimental-feature-descriptions.md: $(d)/xp-features.json $(d)/utils.nix $(d)/generate-xp-features.nix $(bindir)/nix
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@rm -rf $@ $@.tmp
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$(trace-gen) $(nix-eval) --write-to $@.tmp --expr 'import doc/manual/generate-xp-features.nix (builtins.fromJSON (builtins.readFile $<))'
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@mv $@.tmp $@
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$(d)/src/command-ref/experimental-features-shortlist.md: $(d)/xp-features.json $(d)/utils.nix $(d)/generate-xp-features-shortlist.nix $(bindir)/nix
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@rm -rf $@ $@.tmp
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$(trace-gen) $(nix-eval) --write-to $@.tmp --expr 'import doc/manual/generate-xp-features-shortlist.nix (builtins.fromJSON (builtins.readFile $<))'
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@mv $@.tmp $@
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$(d)/xp-features.json: $(bindir)/nix
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$(trace-gen) $(dummy-env) NIX_PATH=nix/corepkgs=corepkgs $(bindir)/nix __dump-xp-features > $@.tmp
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@mv $@.tmp $@
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$(d)/src/language/builtins.md: $(d)/builtins.json $(d)/generate-builtins.nix $(d)/src/language/builtins-prefix.md $(bindir)/nix
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@cat doc/manual/src/language/builtins-prefix.md > $@.tmp
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$(trace-gen) $(nix-eval) --expr 'import doc/manual/generate-builtins.nix (builtins.fromJSON (builtins.readFile $<))' >> $@.tmp;
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@ -145,7 +160,7 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
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done
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@touch $@
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$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/anchors.jq $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/command-ref/conf-file.md $(d)/src/language/builtins.md
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$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/anchors.jq $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/contributing/experimental-feature-descriptions.md $(d)/src/command-ref/conf-file.md $(d)/src/language/builtins.md
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$(trace-gen) \
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tmp="$$(mktemp -d)"; \
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cp -r doc/manual "$$tmp"; \
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@ -89,3 +89,7 @@ However they serve different purposes:
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It is primarily an issue of *design* and *communication*, targeting the broader community.
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This means that experimental features and RFCs are orthogonal mechanisms, and can be used independently or together as needed.
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# Currently available experimental features
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{{#include ./experimental-feature-descriptions.md}}
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@ -5,6 +5,9 @@ rec {
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concatStrings = concatStringsSep "";
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attrsToList = a:
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map (name: { inherit name; value = a.${name}; }) (builtins.attrNames a);
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replaceStringsRec = from: to: string:
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# recursively replace occurrences of `from` with `to` within `string`
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# example:
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@ -74,10 +77,10 @@ rec {
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if aliases == [] then "" else
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"**Deprecated alias:** ${(concatStringsSep ", " (map (s: "`${s}`") aliases))}";
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indent = prefix: s:
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concatStringsSep "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
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in result;
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indent = prefix: s:
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concatStringsSep "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
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showSettings = args: settingsInfo: concatStrings (attrValues (mapAttrs (showSetting args) settingsInfo));
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}
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@ -371,8 +371,23 @@ extern GlobalConfig globalConfig;
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struct ExperimentalFeatureSettings : Config {
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Setting<std::set<ExperimentalFeature>> experimentalFeatures{this, {}, "experimental-features",
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"Experimental Nix features to enable."};
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Setting<std::set<ExperimentalFeature>> experimentalFeatures{
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this, {}, "experimental-features",
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R"(
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Experimental features that are enabled.
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Example:
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```
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experimental-features = nix-command flakes
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```
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The following experimental features are available:
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{{#include experimental-features-shortlist.md}}
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Experimental features are [further documented in the manual](@docroot@/contributing/experimental-features.md).
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)"};
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/**
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* Check whether the given experimental feature is enabled.
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@ -5,29 +5,209 @@
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namespace nix {
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std::map<ExperimentalFeature, std::string> stringifiedXpFeatures = {
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{ Xp::CaDerivations, "ca-derivations" },
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{ Xp::ImpureDerivations, "impure-derivations" },
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{ Xp::Flakes, "flakes" },
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{ Xp::NixCommand, "nix-command" },
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{ Xp::RecursiveNix, "recursive-nix" },
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{ Xp::NoUrlLiterals, "no-url-literals" },
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{ Xp::FetchClosure, "fetch-closure" },
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{ Xp::ReplFlake, "repl-flake" },
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{ Xp::AutoAllocateUids, "auto-allocate-uids" },
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{ Xp::Cgroups, "cgroups" },
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{ Xp::DiscardReferences, "discard-references" },
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struct ExperimentalFeatureDetails
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{
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ExperimentalFeature tag;
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std::string_view name;
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std::string_view description;
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};
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constexpr std::array<ExperimentalFeatureDetails, 11> xpFeatureDetails = {{
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{
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.tag = Xp::CaDerivations,
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.name = "ca-derivations",
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.description = R"(
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Allow derivations to be content-addressed in order to prevent
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rebuilds when changes to the derivation do not result in changes to
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the derivation's output. See
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[__contentAddressed](@docroot@/language/advanced-attributes.md#adv-attr-__contentAddressed)
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for details.
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)",
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},
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{
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.tag = Xp::ImpureDerivations,
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.name = "impure-derivations",
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.description = R"(
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Allow derivations to produce non-fixed outputs by setting the
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`__impure` derivation attribute to `true`. An impure derivation can
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have differing outputs each time it is built.
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Example:
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```
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derivation {
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name = "impure";
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builder = /bin/sh;
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__impure = true; # mark this derivation as impure
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args = [ "-c" "read -n 10 random < /dev/random; echo $random > $out" ];
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system = builtins.currentSystem;
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}
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```
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Each time this derivation is built, it can produce a different
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output (as the builder outputs random bytes to `$out`). Impure
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derivations also have access to the network, and only fixed-output
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or other impure derivations can rely on impure derivations. Finally,
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an impure derivation cannot also be
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[content-addressed](#xp-feature-ca-derivations).
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)",
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},
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{
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.tag = Xp::Flakes,
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.name = "flakes",
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.description = R"(
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Enable flakes. See the manual entry for [`nix
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flake`](@docroot@/command-ref/new-cli/nix3-flake.md) for details.
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)",
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},
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{
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.tag = Xp::NixCommand,
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.name = "nix-command",
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.description = R"(
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Enable the new `nix` subcommands. See the manual on
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[`nix`](@docroot@/command-ref/new-cli/nix.md) for details.
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)",
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},
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{
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.tag = Xp::RecursiveNix,
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.name = "recursive-nix",
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.description = R"(
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Allow derivation builders to call Nix, and thus build derivations
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recursively.
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Example:
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```
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with import <nixpkgs> {};
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runCommand "foo"
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{
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buildInputs = [ nix jq ];
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NIX_PATH = "nixpkgs=${<nixpkgs>}";
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}
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''
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hello=$(nix-build -E '(import <nixpkgs> {}).hello.overrideDerivation (args: { name = "recursive-hello"; })')
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mkdir -p $out/bin
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ln -s $hello/bin/hello $out/bin/hello
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''
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```
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An important restriction on recursive builders is disallowing
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arbitrary substitutions. For example, running
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```
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nix-store -r /nix/store/kmwd1hq55akdb9sc7l3finr175dajlby-hello-2.10
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```
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in the above `runCommand` script would be disallowed, as this could
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lead to derivations with hidden dependencies or breaking
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reproducibility by relying on the current state of the Nix store. An
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exception would be if
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`/nix/store/kmwd1hq55akdb9sc7l3finr175dajlby-hello-2.10` were
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already in the build inputs or built by a previous recursive Nix
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call.
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)",
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},
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{
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.tag = Xp::NoUrlLiterals,
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.name = "no-url-literals",
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.description = R"(
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Disallow unquoted URLs as part of the Nix language syntax. The Nix
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language allows for URL literals, like so:
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```
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$ nix repl
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Welcome to Nix 2.15.0. Type :? for help.
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nix-repl> http://foo
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"http://foo"
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```
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But enabling this experimental feature will cause the Nix parser to
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throw an error when encountering a URL literal:
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```
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$ nix repl --extra-experimental-features 'no-url-literals'
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Welcome to Nix 2.15.0. Type :? for help.
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nix-repl> http://foo
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error: URL literals are disabled
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at «string»:1:1:
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1| http://foo
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| ^
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```
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While this is currently an experimental feature, unquoted URLs are
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being deprecated and their usage is discouraged.
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|
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The reason is that, as opposed to path literals, URLs have no
|
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special properties that distinguish them from regular strings, URLs
|
||||
containing parameters have to be quoted anyway, and unquoted URLs
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may confuse external tooling.
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)",
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},
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{
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.tag = Xp::FetchClosure,
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.name = "fetch-closure",
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.description = R"(
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Enable the use of the [`fetchClosure`](@docroot@/language/builtins.md#builtins-fetchClosure) built-in function in the Nix language.
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)",
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},
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{
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.tag = Xp::ReplFlake,
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.name = "repl-flake",
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.description = R"(
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Allow passing [installables](@docroot@/command-ref/new-cli/nix.md#installables) to `nix repl`, making its interface consistent with the other experimental commands.
|
||||
)",
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},
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{
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.tag = Xp::AutoAllocateUids,
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.name = "auto-allocate-uids",
|
||||
.description = R"(
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Allows Nix to automatically pick UIDs for builds, rather than creating
|
||||
`nixbld*` user accounts. See the [`auto-allocate-uids`](#conf-auto-allocate-uids) setting for details.
|
||||
)",
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||||
},
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||||
{
|
||||
.tag = Xp::Cgroups,
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.name = "cgroups",
|
||||
.description = R"(
|
||||
Allows Nix to execute builds inside cgroups. See
|
||||
the [`use-cgroups`](#conf-use-cgroups) setting for details.
|
||||
)",
|
||||
},
|
||||
{
|
||||
.tag = Xp::DiscardReferences,
|
||||
.name = "discard-references",
|
||||
.description = R"(
|
||||
Allow the use of the [`unsafeDiscardReferences`](@docroot@/language/advanced-attributes.html#adv-attr-unsafeDiscardReferences) attribute in derivations
|
||||
that use [structured attributes](@docroot@/language/advanced-attributes.html#adv-attr-structuredAttrs). This disables scanning of outputs for
|
||||
runtime dependencies.
|
||||
)",
|
||||
},
|
||||
}};
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||||
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static_assert(
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[]() constexpr {
|
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for (auto [index, feature] : enumerate(xpFeatureDetails))
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if (index != (size_t)feature.tag)
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return false;
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||||
return true;
|
||||
}(),
|
||||
"array order does not match enum tag order");
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||||
|
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const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::string_view & name)
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{
|
||||
using ReverseXpMap = std::map<std::string_view, ExperimentalFeature>;
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||||
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||||
static auto reverseXpMap = []()
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||||
{
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||||
static std::unique_ptr<ReverseXpMap> reverseXpMap = []() {
|
||||
auto reverseXpMap = std::make_unique<ReverseXpMap>();
|
||||
for (auto & [feature, name] : stringifiedXpFeatures)
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(*reverseXpMap)[name] = feature;
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for (auto & xpFeature : xpFeatureDetails)
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||||
(*reverseXpMap)[xpFeature.name] = xpFeature.tag;
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return reverseXpMap;
|
||||
}();
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||||
|
||||
|
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@ -37,20 +217,27 @@ const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::str
|
|||
return std::nullopt;
|
||||
}
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||||
|
||||
std::string_view showExperimentalFeature(const ExperimentalFeature feature)
|
||||
std::string_view showExperimentalFeature(const ExperimentalFeature tag)
|
||||
{
|
||||
const auto ret = get(stringifiedXpFeatures, feature);
|
||||
assert(ret);
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||||
return *ret;
|
||||
assert((size_t)tag < xpFeatureDetails.size());
|
||||
return xpFeatureDetails[(size_t)tag].name;
|
||||
}
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||||
|
||||
nlohmann::json documentExperimentalFeatures()
|
||||
{
|
||||
StringMap res;
|
||||
for (auto & xpFeature : xpFeatureDetails)
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||||
res[std::string { xpFeature.name }] =
|
||||
trim(stripIndentation(xpFeature.description));
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||||
return (nlohmann::json) res;
|
||||
}
|
||||
|
||||
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> & rawFeatures)
|
||||
{
|
||||
std::set<ExperimentalFeature> res;
|
||||
for (auto & rawFeature : rawFeatures) {
|
||||
for (auto & rawFeature : rawFeatures)
|
||||
if (auto feature = parseExperimentalFeature(rawFeature))
|
||||
res.insert(*feature);
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -11,8 +11,9 @@ namespace nix {
|
|||
/**
|
||||
* The list of available experimental features.
|
||||
*
|
||||
* If you update this, don’t forget to also change the map defining their
|
||||
* string representation in the corresponding `.cc` file.
|
||||
* If you update this, don’t forget to also change the map defining
|
||||
* their string representation and documentation in the corresponding
|
||||
* `.cc` file as well.
|
||||
*/
|
||||
enum struct ExperimentalFeature
|
||||
{
|
||||
|
|
@ -34,26 +35,52 @@ enum struct ExperimentalFeature
|
|||
*/
|
||||
using Xp = ExperimentalFeature;
|
||||
|
||||
/**
|
||||
* Parse an experimental feature (enum value) from its name. Experimental
|
||||
* feature flag names are hyphenated and do not contain spaces.
|
||||
*/
|
||||
const std::optional<ExperimentalFeature> parseExperimentalFeature(
|
||||
const std::string_view & name);
|
||||
|
||||
/**
|
||||
* Show the name of an experimental feature. This is the opposite of
|
||||
* parseExperimentalFeature().
|
||||
*/
|
||||
std::string_view showExperimentalFeature(const ExperimentalFeature);
|
||||
|
||||
/**
|
||||
* Compute the documentation of all experimental features.
|
||||
*
|
||||
* See `doc/manual` for how this information is used.
|
||||
*/
|
||||
nlohmann::json documentExperimentalFeatures();
|
||||
|
||||
/**
|
||||
* Shorthand for `str << showExperimentalFeature(feature)`.
|
||||
*/
|
||||
std::ostream & operator<<(
|
||||
std::ostream & str,
|
||||
const ExperimentalFeature & feature);
|
||||
|
||||
/**
|
||||
* Parse a set of strings to the corresponding set of experimental features,
|
||||
* ignoring (but warning for) any unkwown feature.
|
||||
* Parse a set of strings to the corresponding set of experimental
|
||||
* features, ignoring (but warning for) any unknown feature.
|
||||
*/
|
||||
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> &);
|
||||
|
||||
/**
|
||||
* An experimental feature was required for some (experimental)
|
||||
* operation, but was not enabled.
|
||||
*/
|
||||
class MissingExperimentalFeature : public Error
|
||||
{
|
||||
public:
|
||||
/**
|
||||
* The experimental feature that was required but not enabled.
|
||||
*/
|
||||
ExperimentalFeature missingFeature;
|
||||
|
||||
MissingExperimentalFeature(ExperimentalFeature);
|
||||
MissingExperimentalFeature(ExperimentalFeature missingFeature);
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -916,16 +916,16 @@ constexpr auto enumerate(T && iterable)
|
|||
{
|
||||
size_t i;
|
||||
TIter iter;
|
||||
bool operator != (const iterator & other) const { return iter != other.iter; }
|
||||
void operator ++ () { ++i; ++iter; }
|
||||
auto operator * () const { return std::tie(i, *iter); }
|
||||
constexpr bool operator != (const iterator & other) const { return iter != other.iter; }
|
||||
constexpr void operator ++ () { ++i; ++iter; }
|
||||
constexpr auto operator * () const { return std::tie(i, *iter); }
|
||||
};
|
||||
|
||||
struct iterable_wrapper
|
||||
{
|
||||
T iterable;
|
||||
auto begin() { return iterator{ 0, std::begin(iterable) }; }
|
||||
auto end() { return iterator{ 0, std::end(iterable) }; }
|
||||
constexpr auto begin() { return iterator{ 0, std::begin(iterable) }; }
|
||||
constexpr auto end() { return iterator{ 0, std::end(iterable) }; }
|
||||
};
|
||||
|
||||
return iterable_wrapper{ std::forward<T>(iterable) };
|
||||
|
|
|
|||
|
|
@ -375,6 +375,11 @@ void mainWrapped(int argc, char * * argv)
|
|||
return;
|
||||
}
|
||||
|
||||
if (argc == 2 && std::string(argv[1]) == "__dump-xp-features") {
|
||||
logger->cout(documentExperimentalFeatures().dump());
|
||||
return;
|
||||
}
|
||||
|
||||
Finally printCompletions([&]()
|
||||
{
|
||||
if (completions) {
|
||||
|
|
|
|||
Loading…
Reference in New Issue