Makefile: add weeder target.

.gitignore

@@ -10,6 +10,7 @@
 !.circleci/**
 !.editorconfig
 !.gitattributes
+!.github/**
 !.gitignore
 !.hlint.yaml
 !.mailmap
@@ -34,6 +35,7 @@
 !release.nix
 !shell.nix
 !stack.yaml
+!weeder.dhall
 !app/**
 !benchmark/**
 !citeproc/**
@@ -42,6 +44,8 @@
 !linux/**
 !macos/**
 !man/**
+!pandoc-server/**
+!pandoc-cli/**
 !src/**
 !test/**
 !tools/**

Makefile

@@ -13,7 +13,7 @@ BASELINECMD=
 else
 BASELINECMD=--baseline $(BASELINE)
 endif
-GHCOPTS=-fdiagnostics-color=always -j4 +RTS -A8m -RTS
+GHCOPTS=-fwrite-ide-info -fdiagnostics-color=always -j4 +RTS -A8m -RTS
 WEBSITE=../../web/pandoc.org
 REVISION?=1
 BENCHARGS?=--csv bench_$(TIMESTAMP).csv $(BASELINECMD) --timeout=6 +RTS -T --nonmoving-gc -RTS $(if $(PATTERN),--pattern "$(PATTERN)",)
@@ -92,6 +92,10 @@ coverage: ## code coverage information
 	open coverage/hpc_index.html
 .PHONY: coverage
 
+weeder: ## run weeder to find dead code
+	weeder
+.PHONY: weeder
+
 transitive-deps: ## print transitive dependencies
 	cabal-plan topo | sort | sed -e 's/-[0-9]\..*//'
 .PHONY: transitive-deps

weeder.dhall

@@ -0,0 +1 @@
+{ roots = [ "^Main.main$", "^Paths_.*$" ] , type-class-roots = True }