Single page for experimental feature descriptions

As requested by @fricklerhandwerk.

.gitignore

@@ -24,7 +24,7 @@ perl/Makefile.config
 /doc/manual/src/command-ref/new-cli
 /doc/manual/src/command-ref/conf-file.md
 /doc/manual/src/command-ref/experimental-features-shortlist.md
-/doc/manual/src/contributing/experimental-features
+/doc/manual/src/contributing/experimental-feature-descriptions.md
 /doc/manual/src/language/builtins.md
 
 # /scripts/

doc/manual/generate-xp-features-shortlist.nix

@@ -4,6 +4,6 @@ with import ./utils.nix;
 let
   showExperimentalFeature = name: doc:
     ''
-      - [`${name}`](@docroot@/contributing/experimental-features/${name}.md)
+      - [`${name}`](@docroot@/contributing/experimental-features.md#xp-feature-${name})
     '';
 in xps: indent "  " (concatStrings (attrValues (mapAttrs showExperimentalFeature xps)))

doc/manual/generate-xp-features.nix

@@ -1,21 +1,11 @@
-xps:
-
 with builtins;
 with import ./utils.nix;
 
 let
-  makePage = { name, value }:
-    {
-      name = "${name}.md";
-      inherit value;
-      feature = name;
-    };
+  showExperimentalFeature = name: doc:
+    squash ''
+      ## [`${name}`]{#xp-feature-${name}}
 
-  featurePages = map makePage (attrsToList xps);
-
-  tableOfContents = let
-    showEntry = page:
-      "    - [${page.feature}](contributing/experimental-features/${page.name})";
-    in concatStringsSep "\n" (map showEntry featurePages) + "\n";
-
-in (listToAttrs featurePages) // { "SUMMARY.md" = tableOfContents; }
+      ${doc}
+    '';
+in xps: (concatStringsSep "\n" (attrValues (mapAttrs showExperimentalFeature xps)))

doc/manual/local.mk

@@ -85,7 +85,7 @@ $(d)/nix.conf.5: $(d)/src/command-ref/conf-file.md
 	$(trace-gen) lowdown -sT man --nroff-nolinks -M section=5 $^.tmp -o $@
 	@rm $^.tmp
 
-$(d)/src/SUMMARY.md: $(d)/src/SUMMARY.md.in $(d)/src/command-ref/new-cli $(d)/src/contributing/experimental-features
+$(d)/src/SUMMARY.md: $(d)/src/SUMMARY.md.in $(d)/src/command-ref/new-cli $(d)/src/contributing/experimental-feature-descriptions.md
 	@cp $< $@
 	@$(call process-includes,$@,$@)
 
@@ -107,7 +107,7 @@ $(d)/conf-file.json: $(bindir)/nix
 	$(trace-gen) $(dummy-env) $(bindir)/nix show-config --json --experimental-features nix-command > $@.tmp
 	@mv $@.tmp $@
 
-$(d)/src/contributing/experimental-features: $(d)/xp-features.json $(d)/utils.nix $(d)/generate-xp-features.nix $(bindir)/nix
+$(d)/src/contributing/experimental-feature-descriptions.md: $(d)/xp-features.json $(d)/utils.nix $(d)/generate-xp-features.nix $(bindir)/nix
 	@rm -rf $@ $@.tmp
 	$(trace-gen) $(nix-eval) --write-to $@.tmp --expr 'import doc/manual/generate-xp-features.nix (builtins.fromJSON (builtins.readFile $<))'
 	@mv $@.tmp $@
@@ -160,7 +160,7 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
 	done
 	@touch $@
 
-$(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-features $(d)/src/command-ref/conf-file.md $(d)/src/language/builtins.md
+$(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
 	$(trace-gen) \
 		tmp="$$(mktemp -d)"; \
 		cp -r doc/manual "$$tmp"; \

doc/manual/src/SUMMARY.md.in

@@ -96,7 +96,6 @@
 - [Contributing](contributing/contributing.md)
   - [Hacking](contributing/hacking.md)
   - [Experimental Features](contributing/experimental-features.md)
-{{#include ./contributing/experimental-features/SUMMARY.md}}
   - [CLI guideline](contributing/cli-guideline.md)
 - [Release Notes](release-notes/release-notes.md)
   - [Release X.Y (202?-??-??)](release-notes/rl-next.md)

doc/manual/src/contributing/experimental-features.md

@@ -89,3 +89,7 @@ However they serve different purposes:
   It is primarily an issue of *design* and *communication*, targeting the broader community.
 
 This means that experimental features and RFCs are orthogonal mechanisms, and can be used independently or together as needed.
+
+# Currently available experimental features
+
+{{#include ./experimental-feature-descriptions.md}}