(info, html): Implement.

(all): Depend on info.

Flatten info directory.  This undoes the move to one subdirectory per
chapter, which was done during Empire 2.  The structure doesn't buy us
much, as the info name space is flat, and it complicates makefiles.

Overhaul info.pl:
- It now wants to run in the root of the build tree.
- Information on source files and subjects is now stored in makefiles,
  thus info.pl no longer picks up random junk from the file system.
- Clean up Perl anachronisms, in particular use subroutine arguments and
  results rather than global variables where convenient.
- Change format of diagnostics to the common format used by GNU tools,
  so that Emacs and the like can parse it.
- Catch missing .SA.
- When creating a new subject file, cowardly refuse to overwrite an
  existing file.
- Subject files contain topics sorted by chapter, then by name.  The
  order of chapters used to depend on how Perl sorts hash keys.  Fix
  it.

.cvsignore

@@ -14,3 +14,4 @@ lib
 sources.mk
 stamp-h
 stamp-h.in
+subjects.mk

Make.mk

@@ -46,9 +46,15 @@
 -include sources.mk
 dirs := $(sort $(dir $(src)))
 csrc := $(filter %.c, $(src))
+tsrc := $(filter %.t, $(src))
+
+# Info topics and subjects
+-include subjects.mk
+topics := $(patsubst %.t,%,$(notdir $(tsrc)))
+info := $(topics) $(subjects) all
 
 # Generated files
-mk := sources.mk
+mk := sources.mk subjects.mk
 ac := autom4te.cache config.h config.status config.log stamp-h	\
 $(basename $(filter %.in, $(src)))
 obj := $(csrc:.c=.o) $(filter %.o, $(ac:.c=.o))
@@ -57,6 +63,12 @@ deps := $(obj:.o=.d)
 libs := $(addprefix lib/, libcommon.a libgen.a libglobal.a)
 util := $(addprefix src/util/, fairland files pconfig)
 progs := $(util) src/client/empire src/server/emp_server
+tsubj := $(addprefix info/, $(addsuffix .t, $(subjects)))
+ttop := info/TOP.t
+info.nr := $(addprefix info.nr/, $(info))
+subjects.html := $(addprefix info.html/, $(addsuffix .html, $(subjects)))
+topics.html := $(addprefix info.html/, $(addsuffix .html, $(topics)))
+info.html := $(addprefix info.html/, $(addsuffix .html, $(info)))
 
 ifeq ($(empthread),POSIX)
 empth_obj := src/lib/empthread/pthread.o
@@ -68,8 +80,9 @@ endif
 
 # Abbreviations
 scripts = $(srcdir)/src/scripts
-clean := $(obj) $(deps) $(libs) $(progs) $(empth_lib)
-distclean := $(ac)
+clean := $(obj) $(deps) $(libs) $(progs) $(empth_lib) $(tsubj)	\
+$(info.nr) $(info.html)
+distclean := $(ac) info/stamp $(ttop)
 
 # Compiler flags
 CPPFLAGS += -I$(srcdir)/include -Iinclude
@@ -83,11 +96,11 @@ LDLIBS += -lm
 ### Advertized goals
 
 .PHONY: all
-all: $(progs) # FIXME info
+all: $(progs) info
 
 .PHONY: info html
-info html:
-	false # FIXME
+info: $(info.nr)
+html: $(info.html)
 
 .PHONY: clean
 clean:
@@ -129,6 +142,13 @@ endif
 # automatic dependency generation
 %: %.c
 
+info.nr/%: info/%.t
+	$(NROFF) -I $(srcdir)/info $(filter %/CRT.MAC, $^) $< | $(AWK) -f $(filter %/Blank.awk, $^) >$@
+# FIXME AT&T nroff doesn't grok -I
+
+info.html/%.html: info/%.t
+	perl $(filter %.pl, $^) $< >$@
+
 
 ### Explicit rules
 
@@ -149,7 +169,37 @@ $(libs) $(empth_lib): | lib
 	$(AR) rc $@ $?
 	$(RANLIB) $@
 
-lib:
+# info.pl reads $(tsrc) and writes subjects.mk $(ttop) $(tsubj).  The
+# naive rule
+#     subjects.mk $(ttop) $(tsubj): $(tsrc)
+#           COMMAND
+# runs COMMAND once for each target.  That's because multiple targets
+# in an explicit rule is just a shorthand for one rule per target,
+# each with the same prerequisites and commands.  A pattern rule with
+# multiple targets does what we want.  So we artificially turn the
+# explicit rule into a pattern rule: we replace info with %, and
+# insert a touch target info/stamp.
+$(patsubst info/%, \%/%, $(ttop) $(tsubj)): %/stamp
+	perl $(srcdir)/info/info.pl
+info/stamp: $(tsrc) info/info.pl
+	>$@
+subjects.mk: $(ttop)
+	:
+
+info.nr/all: $(filter-out info.nr/all, $(info.nr))
+	(cd info.nr && ls -CF) >$@
+# FIXME should use $^ and not ls
+
+info.html/all.html: $(filter-out info.html/all.html, $(info.html)) info/ls2html.pl
+	(cd info.html && ls -CF *.html) | expand | perl $(filter %.pl, $^) >$@
+# FIXME should use $^ and not ls
+
+$(info.nr): info/CRT.MAC info/INFO.MAC info/Blank.awk | info.nr
+
+$(subjects.html): info/subj2html.pl | info.html
+$(topics.html): info/emp2html.pl | info.html
+
+info.nr info.html lib:
 	mkdir -p $@
 
 ifeq ($(cvs_controlled),yes)

info/.cvsignore

@@ -0,0 +1,27 @@
+Combat.t
+Commerce.t
+Commodities.t
+Communication.t
+Deity.t
+Detection.t
+Diplomacy.t
+Distribution.t
+Introduction.t
+LandUnits.t
+Loans.t
+Maps.t
+Missions.t
+Nations.t
+Obsolete.t
+Occupation.t
+Planes.t
+Playing.t
+Populace.t
+Producing.t
+Sectors.t
+Server.t
+Ships.t
+TOP.t
+Transportation.t
+Updates.t
+stamp

info/CRT.MAC

@@ -30,4 +30,4 @@
 .ev 2
 .ll 7.8i        \" Line length: 7.8 inches
 .ev
-.so ../INFO.MAC \" Read in INFO.MAC macros
+.so INFO.MAC \" Read in INFO.MAC macros