feat(systemd): add systemd service

add systemd service through use of a template. This makes sure that
wherever dexedrine is installed the systemd unitfile will be able to
find it.

.gitignore

@@ -1,2 +1,3 @@
 ## Ignore the output binary
 dexedrine
+dexedrine.service

Makefile

@@ -13,17 +13,21 @@ dexpath = $(bindir)/dexedrine
 .PHONY: all clean install
 
 # Define the default rule to build the program
-all: dexedrine
+all: dexedrine dexedrine.service
 
 # Define the rule to compile the source file
 dexedrine: dexedrine.c dexedrine.h
 	$(CC) $(CFLAGS) dexedrine.c -o dexedrine $(LIBS)
 
+dexedrine.service: dexedrine.service.template
+	sed --posix "s@%DEXPATH%@$(dexpath)@" dexedrine.service.template > dexedrine.service
+
 # Define the rule to clean the generated files
 clean:
 	rm dexedrine
 
 # Define how to install
 
-install:
+install: all
 	install dexedrine $(DESTDIR)$(dexpath)
+	install dexedrine.service /usr/lib/systemd/user/dexedrine.service

dexedrine.service.template

@@ -0,0 +1,7 @@
+[Unit]
+Description=Dexedrine
+
+[Service]
+Type=simple
+ExecStart=%DEXPATH%
+KillSignal=SIGINT