Add Cask to deal with dev/runtime dependencies

Follow up from the discussion #370 (comment)

Use:
- Install Cask -
http://cask.readthedocs.org/en/latest/guide/installation.html
```sh
curl -fsSL https://raw.githubusercontent.com/cask/cask/master/go |
python
```
- Trigger tests:
```
make check
```
This will use cask only for the tests target.

*Beware* emacs-23 is not supported by Cask.

Author: ardumont

.gitignore

@@ -4,3 +4,4 @@ haskell-mode-autoloads.el
 haskell-mode.info
 haskell-mode.tmp.texi
 dir
+/.cask/

.travis.yml

@@ -5,6 +5,8 @@ env:
     - EMACS=emacs23
     - EMACS=emacs24
     - EMACS=emacs-snapshot
+  global:
+    - PATH=$HOME/.cask/bin:$PATH
 
 matrix:
   allow_failures:
@@ -27,6 +29,9 @@ install:
         sudo apt-get install -qq emacs-snapshot &&
         sudo apt-get install -qq emacs-snapshot-el;
     fi
+  - make deps
+  - cask --version
+  - cask
 
 script:
   lsb_release -a && $EMACS --version && make EMACS=$EMACS check

Cask

@@ -0,0 +1,11 @@
+(source gnu)
+(source melpa)
+
+(package-file "haskell-mode.el")
+
+(files "*.el")
+
+(development
+ (depends-on "ert")
+ (depends-on "ert-expectations")
+ (depends-on "el-mock"))

Makefile

@@ -69,14 +69,17 @@ ELCHECKS=$(addprefix check-, $(ELFILES:.el=))
 
 .PHONY: all compile info clean check $(ELCHECKS) elpa package
 
+deps:
+	curl -fsSkL https://raw.github.com/cask/cask/master/go | python
+
 all: compile $(AUTOLOADS) info
 
 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; \
+		cask exec $(BATCH) -l "$(<:%.el=tests/%-tests.el)" -f ert-run-tests-batch-and-exit; \
 	fi
 	@echo "--"
 

haskell-mode.el

@@ -11,6 +11,7 @@
 ;; Keywords: faces files Haskell
 ;; Version: 13.10
 ;; URL: https://github.com/haskell/haskell-mode
+;; Version: 13.07
 
 ;; This file is not part of GNU Emacs.
 

tests/haskell-process-tests.el

@@ -6,20 +6,6 @@
 (require 'haskell-process)
 
 (eval-when-compile (require 'cl)) ;; for tests with mock to pass...
-
-(progn ;; HACK install package.el including for emacs-23.3, then install external el-mock dependency
-  (when (version< emacs-version "24")
-    (with-current-buffer (url-retrieve-synchronously "http://git.savannah.gnu.org/gitweb/?p=emacs.git;a=blob_plain;hb=ba08b24186711eaeb3748f3d1f23e2c2d9ed0d09;f=lisp/emacs-lisp/package.el")
-      (save-excursion
-        (goto-char (point-min))
-        (kill-line 8)
-        (eval-buffer))))
-  (require 'package)
-  (package-initialize)
-  (add-to-list 'package-archives '("melpa" . "http://melpa.milkbox.net/packages/"))
-  (package-refresh-contents)
-  (package-install 'el-mock))
-
 (require 'el-mock)
 
 (ert-deftest haskell-process-wrapper-command-function-identity ()