implement tag aliases, replacements, warnings

warnings are printed by `list-tags`

Makefile

@@ -5,6 +5,7 @@ TMPDIR   := _tmp
 BUILDDIR := _build
 INFONAME := info.yaml
 ROOT     := https://gallery.niss.website
+INDEX    := $(DATADIR)/index.yaml
 
 # SMALL = thumbnails, MED = single pages (link to full size)
 SMALL := 200
@@ -28,7 +29,7 @@ BSCRIPTS = $(patsubst %.ts,$(BUILDDIR)/%.js,$(TSCRIPTS))
 all: build
 build: $(BUILDDIR)/index.html $(BSTATIC) $(BSCRIPTS)
 
-$(BUILDDIR)/index.html: $(DATADIR)/index.yaml $(MAKEPAGES)
+$(BUILDDIR)/index.html: $(INDEX) $(MAKEPAGES)
 	echo "[index]   "$@
 	mkdir -p $(dir $@)
 	$(MAKEPAGES) $(MPFLAGS) index --root $(ROOT) $< --output $@
@@ -85,7 +86,7 @@ $(MAKEPAGES): make-pages/*.hs make-pages/make-pages.cabal
 	  -exec cp {} $@ \;
 
 
-$(TMPDIR)/index.mk: $(DATADIR)/index.yaml $(YAMLS) $(MAKEPAGES)
+$(TMPDIR)/index.mk: $(INDEX) $(YAMLS) $(MAKEPAGES)
 	$(call depend-gallery)
 
 NODEPS := mostlyclean clean distclean list-tags
@@ -109,7 +110,7 @@ distclean: clean
 
 .PHONY: list-tags
 list-tags: $(MAKEPAGES)
-	$(MAKEPAGES) list-tags --untagged --nsfw
+	$(MAKEPAGES) list-tags --untagged --warnings --nsfw --index $(INDEX)
 
 
 HOST        ?= gallery.niss.website