build: Start migration to cmake

This preps us for proper system installs to distributions, finding depending
libraries, and allowing us to build the foundation for the GUI and support
tooling next.

The plan is to run g13d as a system daemon managed by systemd. We'll use the
system-wide input group to control access to the daemon.

  - Add a CMakeLists for etc so we can install the udev rules.
  - Move the src dir to g13d to disambiguate a bit.
  - Update the toplevel Makefile so we can still build the old way (for now).

CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.16.3)
+project(g13)
+
+add_subdirectory(g13d)
+add_subdirectory(etc)

Makefile

@@ -3,16 +3,16 @@ LIBS      := -lusb-1.0 -lboost_program_options -lboost_log -lboost_system -lpthr
 PREFIX    ?= /usr/local
 
 G13D_SRCS := \
-	src/g13.cc \
-	src/g13_fonts.cc \
-	src/g13_keys.cc \
-	src/g13_lcd.cc \
-	src/g13_log.cc \
-	src/g13_main.cc \
-	src/g13_stick.cc \
-	src/helper.cc
+	g13d/g13.cc \
+	g13d/g13_fonts.cc \
+	g13d/g13_keys.cc \
+	g13d/g13_lcd.cc \
+	g13d/g13_log.cc \
+	g13d/g13_main.cc \
+	g13d/g13_stick.cc \
+	g13d/helper.cc
 
-G13D_OBJS := $(patsubst src/%.cc,build/%.o,$(G13D_SRCS))
+G13D_OBJS := $(patsubst g13d/%.cc,build/%.o,$(G13D_SRCS))
 
 all: build build/g13d build/pbm2lpbm
 

etc/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.16.3)
+project(g13)
+
+install(FILES 91-g13.rules
+  DESTINATION /etc/udev.d/rules.d/91-g13.rules)

g13d/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.16.3)
+
+project(g13d CXX)
+add_executable(pbm2lpbm pbm2lpbm.cc)
+add_executable(g13d
+  g13.cc
+  g13_fonts.cc
+  g13_keys.cc
+  g13_lcd.cc
+  g13_log.cc
+  g13_main.cc
+  g13_stick.cc
+  helper.cc
+)
+
+target_compile_definitions(g13d PUBLIC BOOST_LOG_DYN_LINK=1)
+find_package(PkgConfig)
+pkg_check_modules(libusb-1.0 REQUIRED libusb-1.0)
+find_package(Boost REQUIRED COMPONENTS system log program_options)
+
+target_link_libraries(g13d
+  ${Boost_SYSTEM_LIBRARY} ${Boost_LOG_LIBRARY} ${Boost_PROGRAM_OPTIONS_LIBRARY}
+  ${libusb-1.0_LIBRARIES})
+
+install(TARGETS g13d pbm2lpbm RUNTIME)