Generic makefile for latex project using latexmk

Makefile

# "Improved" Makefile for LaTeX documents
# INTPUFILE This defines the name of the file you want to latex
# the make file will automatically look for INPUT.tex as the latex file

# check if main file name is in .latexmain, if not, ask for it and save it.
MAINFILE := $(shell if [ -f .latexmain ]; then cat .latexmain; else read -p "Enter main tex file name: " name; echo $$name > .latexmain; cat .latexmain; fi)
INPUTFILE := $(shell basename -s .tex $(MAINFILE))
OTHERFILES := $(shell find . -name '*.tex' -not -name $(MAINFILE))
CLASS_FILES := $(wildcard *.cls)
STYLE_FILES := $(wildcard *.sty)


LMK_FLAGS := -output-directory=./build/ -pdf -pdflatex="pdflatex -synctex=1"
POUND := \#

ifeq ($(OS),Windows_NT)
	detected_OS := Windows
else
	detected_OS := $(shell uname)
endif

ifeq ($(detected_OS),Windows)
	OPEN_APP := start
else
	ifeq ($(detected_OS),Linux)
		OPEN_APP := xdg-open
	else
		OPEN_APP := open
	endif
endif

# define standard colors
ifneq (,$(findstring xterm,${TERM}))
	BLACK        := $(shell tput -Txterm setaf 0)
	RED          := $(shell tput -Txterm setaf 1)
	GREEN        := $(shell tput -Txterm setaf 2)
	YELLOW       := $(shell tput -Txterm setaf 3)
	LIGHTPURPLE  := $(shell tput -Txterm setaf 4)
	PURPLE       := $(shell tput -Txterm setaf 5)
	BLUE         := $(shell tput -Txterm setaf 6)
	WHITE        := $(shell tput -Txterm setaf 7)
	RESET := $(shell tput -Txterm sgr0)
else
	BLACK        := ""
	RED          := ""
	GREEN        := ""
	YELLOW       := ""
	LIGHTPURPLE  := ""
	PURPLE       := ""
	BLUE         := ""
	WHITE        := ""
	RESET        := ""
endif

TARGET_COLOR := ${BLUE}
DESCRIPTION_COLOR := ${GREEN}


.PHONY: clean cleaner watch all view echo help

all: build/${INPUTFILE}.pdf ## Build all targets into the build directory.

build/${INPUTFILE}.pdf: ${INPUTFILE}.tex ${OTHERFILES} ${CLASS_FILES} ${STYLE_FILES} ## Build the target using latexmk.
	latexmk ${LMK_FLAGS} $<
	@echo '****************************************************************'
	@echo '********           Did you spell-check?                 ********'
	@echo '****************************************************************'

clean: ## Remove build directory and any temporary files.
	latexmk -output-directory=./build/ -c
	rm -rf *.bbl ./build/ *.bak

cleaner: ## Remove all files generated by the LaTeX compiler (more than clean).
	latexmk -output-directory=./build/ -C
	rm -rf *.bbl ./build/ *.bak

view: build/${INPUTFILE}.pdf ## View the output of the document using the default viewing app.
	${OPEN_APP} $<

watch: LMK_FLAGS += -pvc -quiet
watch: build/${INPUTFILE}.pdf ## Watch the changes in the file and recompile on save.
	@echo ${LMK_FLAGS}

count:
	texcount -brief *.tex

help:	## Print this message
	@echo ""
	@echo "    :: ${RED}Makefile to compile LaTex documents using latexmk${RESET} ::"
	@echo ""
	@echo "-----------------------------------------------------------------"
	@grep -E '^[a-zA-Z_0-9%-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "${TARGET_COLOR}%-30s${RESET} ${DESCRIPTION_COLOR}%s${RESET}\n", $$1, $$2}'

echo: ## Print debug information for dependencies
	@echo ""
	@echo "-----------------------------------------------------------------"
	@echo " Input file:                ${INPUTFILE}"
	@echo " Other dependencies (.tex): ${OTHERFILES}"
	@echo " Class dependencies (.cls): ${CLASS_FILES}"
	@echo " Style dependencies (.sty): ${STYLE_FILES}"
	@echo "-----------------------------------------------------------------"