adjusted makefile to support multifile sources

Makefile

@@ -1,20 +1,37 @@
 
-OUT_DIR = ./output
-SRC_FILES = $(wildcard *.md)
-OUT_FILES = $(SRC_FILES:.md=.pdf)
-TARGETS   = $(SRC_FILES:.md=)
+OUTPUT    := output
+SINGLE    := $(wildcard *.md)
+MULTI     := $(wildcard *.txt)
+TARGET_S  := $(SINGLE:.md=)
+TARGET_M  := $(MULTI:.txt=)
 
-PANDOC_OPT = --standalone
+PANDOC_OPT = --standalone \
+-V linkcolor:blue \
+-V geometry:a4paper \
+-V geometry:margin=2cm \
+-V monofont="JetBrainsMono Nerd Font" \
+--pdf-engine=xelatex
 
-.PHONY: all clean test
+.PHONY: all clean out_dir test $(DIRECTORIES)
 
-all: $(TARGETS)
+all: $(TARGET_S) $(TARGETS_M)
 
 clean:
-	rm -f $(OUT_DIR)/*
+	rm -f $(OUTPUT)/*
 
-$(TARGETS): %: $(OUT_DIR)/%.pdf
+test:
+	@echo "test test :)"
+	@echo "$(MULTI)"
+
+$(TARGET_S): out_dir
+	@pandoc $(PANDOC_OPT) $@.md -o $(OUTPUT)/$@.pdf
+
+$(TARGET_M): out_dir
+	@pandoc $(PANDOC_OPT) $(shell cat $@.txt | xargs) -o $(OUTPUT)/$@.pdf
+
+out_dir:
+	@if [[ ! -d $(OUTPUT) ]]; then\
+		mkdir $(OUTPUT);\
+	fi
 
-$(OUT_DIR)/%.pdf: %.md
-	pandoc $(PANDOC_OPT) $^ -o $@