Add code coverage

Makefile

@@ -24,12 +24,16 @@ INSTALL_INFO = install-info
 # This is particularly useful when EMACS is set in ~/.bash_profile
 #
 EMACS := $(shell which "$${EMACS}" || which "emacs")
+EMACS_VERSION := $(shell "$(EMACS)" -Q --batch --eval '(princ emacs-version)')
 
 EFLAGS = --eval "(add-to-list 'load-path (expand-file-name \"tests/compat\") 'append)" \
 	 --eval "(when (< emacs-major-version 24) \
 		    (setq byte-compile-warnings '(not cl-functions)))" \
 	 --eval '(setq byte-compile-error-on-warn t)' \
-	 --eval '(when (not (version< emacs-version "24.4")) (setq load-prefer-newer t))'
+	 --eval '(when (not (version< emacs-version "24.4")) (setq load-prefer-newer t))' \
+	 --eval '(defun byte-compile-dest-file (filename) \
+                    (concat (file-name-directory filename) "build-" emacs-version "/" \
+                            (file-name-nondirectory filename) "c"))'
 
 BATCH = $(EMACS) $(EFLAGS) --batch -Q -L .
 
@@ -75,17 +79,13 @@ ELFILES = \
 	haskell-utils.el \
 	inf-haskell.el
 
-ELCFILES = $(ELFILES:.el=.elc)
+ELCHECKS := $(shell echo tests/*-tests.el)
+
 AUTOLOADS = haskell-mode-autoloads.el
 
 PKG_DIST_FILES = $(ELFILES) logo.svg NEWS haskell-mode.info dir
-ELCHECKS=$(addprefix check-, $(ELFILES:.el=))
-
-%.elc: %.el
-	@$(BATCH) \
-		 -f batch-byte-compile $*.el
 
-.PHONY: all compile info clean check $(ELCHECKS) elpa package check-emacs-version
+.PHONY: all compile info clean check check-emacs-version
 
 all: check-emacs-version compile $(AUTOLOADS) info
 
@@ -100,20 +100,30 @@ check-emacs-version :
                             (message \"   3.  make EMACS=/path/to/emacs\")			\
                             (kill-emacs 2))"
 
-compile: $(ELCFILES)
-
-$(ELCHECKS): check-%: %.el %.elc
-	@$(BATCH) --eval '(when (check-declare-file "$*.el") (error "check-declare failed"))'
-	@if [ -f "$(<:%.el=tests/%-tests.el)" ]; then \
-		$(BATCH) -l "$(<:%.el=tests/%-tests.el)" -f ert-run-tests-batch-and-exit; \
+compile: build-$(EMACS_VERSION)
+
+build-$(EMACS_VERSION) : $(ELFILES)
+	if [ ! -d $@ ]; then mkdir $@; fi
+	$(BATCH) -f batch-byte-compile-if-not-done $^
+
+check-%: tests/%-tests.el
+	$(BATCH) -l "$<" -f ert-run-tests-batch-and-exit;
+
+check: $(ELCHECKS) build-$(EMACS_VERSION)
+	$(BATCH) --eval "(when (>= emacs-major-version 24)                            \
+                           (require 'undercover)                                      \
+                           (undercover \"*.el\" (:exclude \"haskell-mode-pkg.el\")))" \
+                 $(patsubst %,-l %,$(ELCHECKS))				              \
+                 -f ert-run-tests-batch-and-exit
+	@TAB=$$(echo "\t"); \
+	if grep -Hn "[ $${TAB}]\+\$$" *.el; then \
+	    echo "Some files contain whitespace at the end of lines, correct it"; \
+	    exit 3; \
 	fi
-	@echo "--"
-
-check: $(ELCHECKS)
 	@echo "checks passed!"
 
 clean:
-	$(RM) $(ELCFILES) $(AUTOLOADS) $(AUTOLOADS:.el=.elc) haskell-mode.info dir
+	$(RM) -r build-$(EMACS_VERSION) $(AUTOLOADS) $(AUTOLOADS:.el=.elc) haskell-mode.info dir
 
 info: haskell-mode.info dir
 
@@ -158,7 +168,7 @@ doc/html : doc/html/index.html			\
 deploy-manual : doc/html
 	cd doc && ./deploy-manual.sh
 
-$(AUTOLOADS): $(ELFILES) haskell-mode.elc
+$(AUTOLOADS): $(ELFILES)
 	$(BATCH) \
 		--eval '(setq make-backup-files nil)' \
 		--eval '(setq generated-autoload-file "$(CURDIR)/$@")' \

README.md

@@ -3,6 +3,7 @@
 
 This is an Emacs mode for editing, debugging and developing Haskell programs.
 
+[![Coverage Status](https://coveralls.io/repos/haskell/haskell-mode/badge.svg?branch=master&service=github)](https://coveralls.io/github/haskell/haskell-mode?branch=master)
 [![Build Status](https://travis-ci.org/haskell/haskell-mode.svg?branch=master)](https://travis-ci.org/haskell/haskell-mode)
 [![Melpa Status](http://melpa.org/packages/haskell-mode-badge.svg)](http://melpa.org/#/haskell-mode)
 [![Melpa Stable Status](http://stable.melpa.org/packages/haskell-mode-badge.svg)](http://stable.melpa.org/#/haskell-mode)