### -*-makefile-*-
###
### Build script for the TrIPE Android app
###
### (c) 2018 Straylight/Edgeware
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the Trivial IP Encryption (TrIPE) Android app.
###
### TrIPE is free software: you can redistribute it and/or modify it under
### the terms of the GNU General Public License as published by the Free
### Software Foundation; either version 3 of the License, or (at your
### option) any later version.
###
### TrIPE is distributed in the hope that it will be useful, but WITHOUT
### ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
### FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
### for more details.
###
### You should have received a copy of the GNU General Public License
### along with TrIPE.  If not, see <https://www.gnu.org/licenses/>.

PACKAGE			 = tripe-android
VERSION			:= $(shell ./auto-version)

.SECONDEXPANSION: #sorry

###--------------------------------------------------------------------------
### Build parameters.

## Where to put the object files.
OUTDIR			 = out/

## Native C compiler.
CC			 = gcc
CFLAGS			 = -O2 -g -Wall -pedantic -Werror

## Native linker.
LD			 = gcc
LDFLAGS.so		 = -shared

## External `pkg-config' packages required.
PKGS			 = mLib catacomb

## Java development kit.
JDKDIR			 = /usr/lib/jvm/default-java
JDK_PLAT		 = linux
JNI_INCLUDES		 = $(JDKDIR)/include $(JDKDIR)/include/$(JDK_PLAT)

## Default arguments for the Java runtime.
JAVADEFS		 =

## The Java runtime, for some reason, hardcodes its default for
## `java.io.tmpdir', inviting security problems.  If the user has defined a
## `TMPDIR', then persuade Java to use it.
explicit-tmpdir-p	 = $(if $(filter-out undefined,$(origin TMPDIR)),t,nil)
ifeq ($(explicit-tmpdir-p), t)
  JAVADEFS		+= -Djava.io.tmpdir=$(TMPDIR)
endif

## Java compiler.
JAVAC			 = javac $(JAVADEFS)
JAVAFLAGS		 =

## Scala compiler.
##
## Unfortunately, `fsc' is a total security disaster.  On the other hand,
## `scalac' is rather slow.  If we're running with a custom `TMPDIR', and the
## `noip' wrapper <https://git.distorted.org.uk/~mdw/preload-hacks/> is
## available, then we can tame `fsc' enough that it's probably safe to run;
## otherwise, it's too risky to enable by default.
noip-available-p	:= $(shell noip echo t 2>/dev/null || echo nil)
ifeq ($(noip-available-p), t)
  NOIP			 = noip
endif
ifeq "$(explicit-tmpdir-p),$(noip-available-p)" "t,t"
  SCALAC		 = $(NOIP) fsc $(JAVADEFS)
  SCALAC_RESET		 = $(SCALAC) -reset
else
  SCALAC		 = scalac $(JAVADEFS)
  SCALAC_RESET		 =
endif
SCALAFLAGS		 = -optimise -feature -deprecation -Xfatal-warnings \
				-Xlint -Xlint:-package-object-classes \
				-Yinline-warnings:false
SCALA_REPL		 = $(NOIP) scala $(JAVADEFS)

## Silent-rules is on by default.
V			 = 0

## Allow local overrides at this point.
-include local.mk

###--------------------------------------------------------------------------
### Silent-rules machinery.

v_tag			 = $(call v_tag_$V,$1)
v_tag_0			 = @printf "  %-8s %s\n" "$1" "$@";

V_AT			 = $(V_AT_$V)
V_AT_0			 = @

###--------------------------------------------------------------------------
### External native packages.

PKGS_CFLAGS		:= $(foreach p,$(PKGS),$(shell pkg-config --cflags $p))
PKGS_LIBS		:= $(foreach p,$(PKGS),$(shell pkg-config --libs $p))

ALL_CFLAGS		 = $(CFLAGS) -fPIC \
				$(addprefix -I,$(JNI_INCLUDES)) \
				$(PKGS_CFLAGS)

LIBS			 = $(PKGS_LIBS)

###--------------------------------------------------------------------------
### Various other tweaks and overrides.

## Hack around https://issues.scala-lang.org/browse/SI-9689
SCALAFLAGS		+= -Yno-load-impl-class

###--------------------------------------------------------------------------
### And now we can start building things.

all::
.PHONY: all

CLEANFILES		 =
clean::
.PHONY: clean

###--------------------------------------------------------------------------
### Native C code.

out/%.o: %.c
	$(call v_tag,CC)mkdir -p $(OUTDIR) && \
		$(CC) -c $(ALL_CFLAGS) -MMD -o$@ $<

ALL_SOURCES		 =
DISTFILES		+= $(ALL_SOURCES)

objects			 = $(patsubst %.c,$(OUTDIR)%$2,$1)
CLEANFILES		+= $(OUTDIR)*.o $(OUTDIR)*.d

###--------------------------------------------------------------------------
### Java classes.

## Java and Scala source files turn into multiple `.class' files with
## unpredictable names.  Rather than try to guess stable outputs for these
## sources, we make artificial `timestamp' files and uses these in our
## dependencies.
CLASSDIR		 = $(OUTDIR)cls/
stamps			 = $(patsubst %,$(OUTDIR)%.stamp,$1)

clean::; rm -rf $(CLASSDIR)
CLEANFILES		+= $(OUTDIR)*.stamp

## Compiling actual Java code.  Note that this confuses the resident Scala
## compiler, so we have to reset it here.
CLSISH			+= java
$(OUTDIR)%.stamp: %.java
	$(call v_tag,JAVAC)mkdir -p $(CLASSDIR) && \
		$(JAVAC) -d $(CLASSDIR) -cp $(CLASSDIR) $(JAVAFLAGS) $< && \
		echo built >$@
	$(V_AT)$(SCALAC_RESET)

## Compiling Scala code.
CLSEXT			+= scala
$(OUTDIR)%.stamp: %.scala
	$(call v_tag,SCALAC)mkdir -p $(CLASSDIR) && \
		$(SCALAC) -d $(CLASSDIR) -cp $(CLASSDIR) $(SCALAFLAGS) $< && \
		echo built >$@

###--------------------------------------------------------------------------
### Native-code libraries.

SHLIBS			+= toy
toy_SOURCES		 = jni.c

shlibfile		 = $(patsubst %,$(OUTDIR)lib%.so,$1)
SHLIBFILES		 = $(call shlibfile,$(SHLIBS))
TARGETS			+= $(SHLIBFILES)
ALL_SOURCES		+= $(foreach l,$(SHLIBS),$($l_SOURCES))

$(SHLIBFILES): $(OUTDIR)lib%.so: $$(call objects,$$($$*_SOURCES),.o)
	$(call v_tag,LD)$(LD) $(LDFLAGS.so) -o$@ $^ $(LIBS)

###--------------------------------------------------------------------------
### Java classes.

## Writing things out longhand is tedious.  `CLASSES' is a list of entries of
## the form `SRC[:DEP,...]', saying that `SRC.ext', being a source file
## capable of being built into `.class' files and setting `SRC.stamp', should
## be so built, and that it depends on other similar sources named DEP having
## been so built.
CLASSES			+= util
CLASSES			+= sys:util
CLASSES			+= admin:sys,util
CLASSES			+= tar:util
CLASSES			+= progress:sys,util
CLASSES			+= keys:progress,tar,sys,util
CLASSES			+= terminal:progress,sys,util
CLASSES			+= main:sys

## Machinery for parsing the `CLASSES' list.
COMMA			 = ,
class-name		 = $(firstword $(subst :, ,$1))
class-deps		 = $(subst $(COMMA), ,$(word 2,$(subst :, ,$1)))

CLASS_NAMES		 = $(foreach c,$(CLASSES),$(call class-name,$c))

all:: $(call stamps,$(CLASS_NAMES))

$(foreach c,$(CLASSES),$(eval $(call stamps,$(call class-name,$c)): \
	$(call stamps,$(call class-deps,$c))))

DISTFILES		+= $(foreach c,$(CLASSES),\
				$(foreach e,$(CLSEXT),\
				  $(wildcard $(call class-name,$c).$e)))

###--------------------------------------------------------------------------
### Distribution arrangements.

DISTFILES		+= COPYING
DISTFILES		+= Makefile
DISTFILES		+= auto-version

distdir			 = $(PACKAGE)-$(VERSION)
DISTTAR			 = $(distdir).tar.gz

distdir:
	rm -rf $(OUTDIR)$(distdir)
	mkdir $(OUTDIR)$(distdir)
	echo $(VERSION) >$(OUTDIR)$(distdir)/RELEASE
	set -e; for i in $(DISTFILES); do \
	  case $$i in */*) mkdir -p $(OUTDIR)$(distdir)/$${i%/*} ;; esac; \
	  cp $$i $(OUTDIR)$(distdir)/; \
	done
.PHONY: distdir

dist: distdir
	set -e; cd $(OUTDIR); tar chozf ../$(DISTTAR) $(distdir)
	rm -rf $(distdir)
.PHONY: dist

###--------------------------------------------------------------------------
### Finishing touches.

all:: $(TARGETS)

clean::; rm -f $(CLEANFILES) $(TARGETS)

repl: all
	$(SCALA_REPL) -cp $(CLASSDIR) -Djava.library.path=$(OUTDIR)
.PHONY: repl

-include $(call objects,$(ALL_SOURCES),.d)

###----- That's all, folks --------------------------------------------------