Remove stray 'Title:' from the manual

Closes #4096.

doc/manual/generate-manpage.nix

@@ -52,5 +52,4 @@ in
 
 command:
 
-"Title: nix\n\n"
-+ showCommand { command = "nix"; section = "#"; def = command; }
+showCommand { command = "nix"; section = "#"; def = command; }

doc/manual/local.mk

@@ -18,13 +18,22 @@ dist-files += $(man-pages)
 nix-eval = $(bindir)/nix eval --experimental-features nix-command -I nix/corepkgs=corepkgs --store dummy:// --impure --raw --expr
 
 $(d)/%.1: $(d)/src/command-ref/%.md
-	$(trace-gen) lowdown -sT man $^ -o $@
+	@printf "Title: %s\n\n" "$$(basename $@ .1)" > $^.tmp
+	@cat $^ >> $^.tmp
+	$(trace-gen) lowdown -sT man $^.tmp -o $@
+	@rm $^.tmp
 
 $(d)/%.8: $(d)/src/command-ref/%.md
-	$(trace-gen) lowdown -sT man $^ -o $@
+	@printf "Title: %s\n\n" "$$(basename $@ .8)" > $^.tmp
+	@cat $^ >> $^.tmp
+	$(trace-gen) lowdown -sT man $^.tmp -o $@
+	@rm $^.tmp
 
 $(d)/nix.conf.5: $(d)/src/command-ref/conf-file.md
-	$(trace-gen) lowdown -sT man $^ -o $@
+	@printf "Title: %s\n\n" "$$(basename $@ .5)" > $^.tmp
+	@cat $^ >> $^.tmp
+	$(trace-gen) lowdown -sT man $^.tmp -o $@
+	@rm $^.tmp
 
 $(d)/src/command-ref/nix.md: $(d)/nix.json $(d)/generate-manpage.nix $(bindir)/nix
 	$(trace-gen) $(nix-eval) 'import doc/manual/generate-manpage.nix (builtins.fromJSON (builtins.readFile $<))' > $@.tmp

doc/manual/src/command-ref/conf-file-prefix.md

@@ -1,5 +1,3 @@
-Title: nix.conf
-
 # Name
 
 `nix.conf` - Nix configuration file

doc/manual/src/command-ref/nix-build.md

@@ -1,5 +1,3 @@
-Title: nix-build
-
 # Name
 
 `nix-build` - build a Nix expression

doc/manual/src/command-ref/nix-channel.md

@@ -1,5 +1,3 @@
-Title: nix-channel
-
 # Name
 
 `nix-channel` - manage Nix channels

doc/manual/src/command-ref/nix-collect-garbage.md

@@ -1,5 +1,3 @@
-Title: nix-collect-garbage
-
 # Name
 
 `nix-collect-garbage` - delete unreachable store paths

doc/manual/src/command-ref/nix-copy-closure.md

@@ -1,5 +1,3 @@
-Title: nix-copy-closure
-
 # Name
 
 `nix-copy-closure` - copy a closure to or from a remote machine via SSH

doc/manual/src/command-ref/nix-daemon.md

@@ -1,5 +1,3 @@
-Title: nix-daemon
-
 # Name
 
 `nix-daemon` - Nix multi-user support daemon

doc/manual/src/command-ref/nix-env.md

@@ -1,5 +1,3 @@
-Title: nix-env
-
 # Name
 
 `nix-env` - manipulate or query Nix user environments

doc/manual/src/command-ref/nix-hash.md

@@ -1,5 +1,3 @@
-Title: nix-hash
-
 # Name
 
 `nix-hash` - compute the cryptographic hash of a path

doc/manual/src/command-ref/nix-instantiate.md

@@ -1,5 +1,3 @@
-Title: nix-instantiate
-
 # Name
 
 `nix-instantiate` - instantiate store derivations from Nix expressions

doc/manual/src/command-ref/nix-prefetch-url.md

@@ -1,5 +1,3 @@
-Title: nix-prefetch-url
-
 # Name
 
 `nix-prefetch-url` - copy a file from a URL into the store and print its hash

doc/manual/src/command-ref/nix-shell.md

@@ -1,5 +1,3 @@
-Title: nix-shell
-
 # Name
 
 `nix-shell` - start an interactive shell based on a Nix expression

doc/manual/src/command-ref/nix-store.md

@@ -1,5 +1,3 @@
-Title: nix-store
-
 # Name
 
 `nix-store` - manipulate or query the Nix store