Merge pull request #62 from Hi-Angel/improve-indentation-config-msg

Improve indentation config msg

Author: Hi-Angel

README.md

@@ -68,17 +68,16 @@ and recommended installation method.
 Basic Configuration
 -------------------
 
-For setup instructions, please consult the new integrated purescript-mode
-[Info](https://www.gnu.org/software/texinfo/manual/info/info.html)
-manual which can be accessed after installation via
-`M-x info-display-manual [RET] purescript-mode`.
-
-Support
--------
-
-- [Github homepage](https://github.com/purescript-emacs/purescript-mode)
-
-Contributing
-------------
-
-Please make sure your pull requests are at least properly rebased and up to date.
+PureScript mode provides multiple indentation engines, and leaves the choice up to the user. To have indentation an according indentation mode needs to be enabled. Otherwise, attempting to indent will print an error describing this.
+
+Minimal configuration may look something like:
+
+```lisp
+(use-package purescript-mode
+  :defer t
+  :config
+  (defun myhook-purescript-mode ()
+    (turn-on-purescript-indentation)
+    (add-hook 'before-save-hook #'purescript-sort-imports nil t))
+  (add-hook 'purescript-mode-hook #'myhook-purescript-mode))
+```

purescript-mode.el

@@ -407,7 +407,10 @@ is asked to show extra info for the items matching QUERY.."
 has been selected.
 
 Brings up the documentation for purescript-mode-hook."
-  (describe-variable 'purescript-mode-hook))
+  (error
+   "To use indentation you need to turn-on one of the indentation modes. Please see `purescript-mode-hook' documentation for examples.
+
+Currently `purescript-indentation' is the most maintained mode."))
 
 (defun purescript-mode-format-imports ()
   "Format the imports by aligning and sorting them."