enable to customize between cabal repl and cabal new-repl

Author: ukari

haskell-customize.el

@@ -137,6 +137,14 @@ which will be prepended to `haskell-process-args-cabal-repl'."
   :group 'haskell-interactive
   :type '(choice string (repeat string)))
 
+(defcustom haskell-process-cabal-repl-command
+  "repl"
+  "The repl command for starting ghci with cabal.
+This can either be repl or new-repl."
+  :group 'haskell-interactive
+  :type '(choice (const repl)
+                 (const new-repl)))
+
 (defcustom haskell-process-path-stack
   "stack"
   "The path for starting stack.

haskell-process.el

@@ -95,7 +95,7 @@ HPTYPE is the result of calling `'haskell-process-type`' function."
                       (list
                        (append
                         (haskell-process-path-to-list haskell-process-path-cabal)
-                        (list "repl")
+                        (list haskell-process-cabal-repl-command)
                         haskell-process-args-cabal-repl
                         (let ((target (haskell-session-target session)))
                           (if target (list target) nil)))))))

inf-haskell.el

@@ -62,7 +62,7 @@ directory structure."
                                haskell-process-path-ghci
                              (list haskell-process-path-ghci))
                            haskell-process-args-ghci))))
-    ('cabal-repl `(,haskell-process-path-cabal "repl" ,@haskell-process-args-cabal-repl))
+    ('cabal-repl `(,haskell-process-path-cabal ,haskell-process-cabal-repl-command ,@haskell-process-args-cabal-repl))
     ('stack-ghci `(,haskell-process-path-stack "ghci" ,@haskell-process-args-stack-ghci))))
 
 (defconst inferior-haskell-info-xref-re