Implement user option ruby-align-chained-calls

* lisp/progmodes/ruby-mode.el (ruby-align-chained-calls): New option.
(ruby-smie-grammar): Make "." right-associative.  Make its priority
lower than the ternary and all binary operators.
(ruby-smie-rules): Indent "(" relative to the first non-"."
parent, or the first "." parent at indentation.  Use
`ruby-align-chained-calls' for indentation of "." tokens.

* test/automated/ruby-mode-tests.el (ruby-align-chained-calls):
New test.

Fixes: debbugs:16593

5 files changed, 64 insertions, 11 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 0a609682d62..90c00963ad4 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,13 @@
+2014-01-31  Dmitry Gutov  <dgutov@yandex.ru>
+
+        * progmodes/ruby-mode.el (ruby-align-chained-calls): New option.
+        (ruby-smie-grammar): Make "." right-associative.  Make its priority
+        lower than the ternary and all binary operators.
+        (ruby-smie-rules): Indent "(" relative to the first non-"."
+        parent, or the first "." parent at indentation.  Use
+        `ruby-align-chained-calls' for indentation of "." tokens.
+        (Bug#16593)
+
 2014-01-31  Juri Linkov  <juri@jurta.org>
 
         * sort.el (delete-duplicate-lines): Remove `:weakness 'key'
diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index f0a9da80ea4..17e16217ccb 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -264,6 +264,15 @@ Only has effect when `ruby-use-smie' is t.
   :safe 'listp
   :version "24.4")
 
+(defcustom ruby-align-chained-calls nil
+  "If non-nil, chained method calls on multiple lines will be
+aligned to the same column.
+
+Only has effect when `ruby-use-smie' is t."
+  :type 'boolean
+  :group 'ruby
+  :safe 'booleanp)
+
 (defcustom ruby-deep-arglist t
   "Deep indent lists in parenthesis when non-nil.
 Also ignores spaces after parenthesis when `space'.
@@ -350,10 +359,10 @@ It is used when `ruby-encoding-magic-comment-style' is set to `custom'."
              ;; but avoids lots of conflicts:
              (exp "and" exp) (exp "or" exp))
        (exp  (exp1) (exp "," exp) (exp "=" exp)
-             (id " @ " exp)
-             (exp "." id))
+             (id " @ " exp))
        (exp1 (exp2) (exp2 "?" exp1 ":" exp1))
-       (exp2 ("def" insts "end")
+       (exp2 (exp3) (exp3 "." exp2))
+       (exp3 ("def" insts "end")
              ("begin" insts-rescue-insts "end")
              ("do" insts "end")
              ("class" insts "end") ("module" insts "end")
@@ -380,7 +389,7 @@ It is used when `ruby-encoding-magic-comment-style' is set to `custom'."
        (ielsei (itheni) (itheni "else" insts))
        (if-body (ielsei) (if-body "elsif" if-body)))
      '((nonassoc "in") (assoc ";") (right " @ ")
-       (assoc ",") (right "=") (assoc "."))
+       (assoc ",") (right "="))
      '((assoc "when"))
      '((assoc "elsif"))
      '((assoc "rescue" "ensure"))
@@ -399,7 +408,8 @@ It is used when `ruby-encoding-magic-comment-style' is set to `custom'."
        (nonassoc ">" ">=" "<" "<=")
        (nonassoc "==" "===" "!=")
        (nonassoc "=~" "!~")
-       (left "<<" ">>"))))))
+       (left "<<" ">>")
+       (right "."))))))
 
 (defun ruby-smie--bosp ()
   (save-excursion (skip-chars-backward " \t")
@@ -609,7 +619,18 @@ It is used when `ruby-encoding-magic-comment-style' is set to `custom'."
         ;; When after `.', let's always de-indent,
         ;; because when `.' is inside the line, the
         ;; additional indentation from it looks out of place.
-        ((smie-rule-parent-p ".") (smie-rule-parent (- ruby-indent-level)))
+        ((smie-rule-parent-p ".")
+         (let (smie--parent)
+           (save-excursion
+             ;; Traverse up the parents until the parent is "." at
+             ;; indentation, or any other token.
+             (while (and (progn
+                           (goto-char (1- (cadr (smie-indent--parent))))
+                           (not (ruby-smie--bosp)))
+                         (progn
+                           (setq smie--parent nil)
+                           (smie-rule-parent-p "."))))
+             (smie-rule-parent))))
         (t (smie-rule-parent))))))
     (`(:after . ,(or `"(" "[" "{"))
      ;; FIXME: Shouldn't this be the default behavior of
@@ -622,7 +643,10 @@ It is used when `ruby-encoding-magic-comment-style' is set to `custom'."
        (unless (or (eolp) (forward-comment 1))
          (cons 'column (current-column)))))
     (`(:before . "do") (ruby-smie--indent-to-stmt))
-    (`(:before . ".") ruby-indent-level)
+    (`(:before . ".")
+     (if (smie-rule-sibling-p)
+         (and ruby-align-chained-calls 0)
+       ruby-indent-level))
     (`(:after . "=>") ruby-indent-level)
     (`(:before . ,(or `"else" `"then" `"elsif" `"rescue" `"ensure"))
      (smie-rule-parent))
diff --git a/test/ChangeLog b/test/ChangeLog
index 50ffd7c3957..5afc9890aff 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,8 @@
+2014-01-31  Dmitry Gutov  <dgutov@yandex.ru>
+
+        * automated/ruby-mode-tests.el (ruby-align-chained-calls):
+        New test.
+
 2014-01-27  Michael Albinus  <michael.albinus@gmx.de>
 
         * automated/file-notify-tests.el (file-notify--deftest-remote):
diff --git a/test/automated/ruby-mode-tests.el b/test/automated/ruby-mode-tests.el
index aa8032bb870..f6fddb5ef4c 100644
--- a/test/automated/ruby-mode-tests.el
+++ b/test/automated/ruby-mode-tests.el
@@ -333,6 +333,20 @@ VALUES-PLIST is a list with alternating index and value elements."
      |      42
      |    end")))
 
+(ert-deftest ruby-align-chained-calls ()
+  (let ((ruby-align-chained-calls t))
+    (ruby-should-indent-buffer
+     "one.two.three
+     |       .four
+     |
+     |my_array.select { |str| str.size > 5 }
+     |        .map    { |str| str.downcase }"
+     "one.two.three
+     |  .four
+     |
+     |my_array.select { |str| str.size > 5 }
+     |   .map    { |str| str.downcase }")))
+
 (ert-deftest ruby-move-to-block-stops-at-indentation ()
   (ruby-with-temp-buffer "def f\nend"
     (beginning-of-line)
diff --git a/test/indent/ruby.rb b/test/indent/ruby.rb
index a0116fef18e..49ed92f8fdc 100644
--- a/test/indent/ruby.rb
+++ b/test/indent/ruby.rb
@@ -257,8 +257,8 @@ foo ^
   bar
 
 foo_bar_tee(1, 2, 3)
-  .qux
-  .bar
+  .qux.bar
+  .tee
 
 foo do
   bar
@@ -338,7 +338,7 @@ end
 %^abc^
 ddd
 
-qux = foo ?
+qux = foo.fee ?
         bar :
         tee
 
@@ -348,7 +348,7 @@ zoo.keep.bar!(
 
 zoo
   .lose(
-  q, p)
+    q, p)
 
 foo(bar:
       tee)