Makefile: integrate makeinfo to build the manual

Signed-off-by: Adrien 'neox' Bourmault <neox@a-lec.org>

.gitignore

@@ -2,4 +2,5 @@ bin/*
 build/*
 docs/html/*
 docs/rtfm/man3/*
+docs/rtfm/*.pdf
 scripts/junk

Makefile

@@ -1,4 +1,4 @@
-.PHONY: run clean install all docs
+.PHONY: run clean install all docs man
 .DELETE_ON_ERROR: $(BINDIR)/Getting_Started_with_GTK
 .DEFAULT_GOAL: all
 
@@ -7,6 +7,7 @@ MAKEFLAGS += --jobs=$(CPUS)
 
 CC=gcc
 DOXYGEN=doxygen
+MAKEINFO=makeinfo
 CFLAGS=`pkg-config --cflags gtk4 epoxy glib-2.0 libxml-2.0`
 LDFLAGS=`pkg-config --libs gtk4 epoxy glib-2.0 libxml-2.0` -lGL -lGLU -lm -lepoxy -lX11 -lGLEW
 WARNINGS = -Wall
@@ -19,6 +20,8 @@ BINDIR=bin
 BUILDDIR=build
 SRCDIR=src
 DOCSDIR=docs
+MANSRC=$(DOCSDIR)/rtfm/*.texi
+MANDIR=$(DOCSDIR)/rtfm
 
 SOURCES = $(shell find $(SRCDIR) -type f -name "*.c")
 OBJECTS = $(patsubst %.c,$(BUILDDIR)/%.o,$(SOURCES))
@@ -64,6 +67,13 @@ $(BUILDDIR)/%.o: %.c Makefile | $(BUILDDIR)
 	@$(CC) $(CFLAGS) $(WARNINGS) $(DEBUG) $(OPTIMIZE) -c $< -o $@
 	@echo "    CC $@"
 
+#
+# Manual
+#
+$(MANDIR)/gem-graph.pdf: $(MANSRC)
+	cd $(BUILDDIR) && $(MAKEINFO) --pdf ../$(MANSRC) -o ../$(MANDIR)/gem-graph.pdf
+	@echo "    MAKEINFO $(MANSRC)"
+
 #
 # Virtual recipes
 #
@@ -77,12 +87,15 @@ docs: $(SOURCES) $(DEPENDENCIES)
 	@$(DOXYGEN) $(DOCSDIR)/doxyfile
 	@echo "    DOXYGEN $(DOCSDIR)/doxyfile"
 
+man: $(MANDIR)/gem-graph.pdf
+
 clean:
 	@rm -rf $(BINDIR)
 	@echo "    RM $(BINDIR)"
 	@rm -rf $(BUILDDIR)
 	@echo "    RM $(BUILDDIR)"
-
+	@rm -rf $(MANDIR)/gem-graph.pdf
+	@echo "    RM $(MANDIR)/gem-graph.pdf"
 
 # More docs :
 #       https://www.gnu.org/software/make/manual/