Fix for indentation of f90 preproc lines embedded in continuations

* lisp/progmodes/f90.el (f90-line-continued, f90-indent-region):
Treat preprocessor lines embedded in continuations like comments.
(f90-indent-line): Special-case preprocessor lines. 

* test/automated/f90.el (f90-test-bug13138): New test.

4 files changed, 47 insertions, 14 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index ebce9305f31..2aafbd758d7 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2012-12-11  Glenn Morris  <rgm@gnu.org>
+
+        * progmodes/f90.el (f90-line-continued, f90-indent-region):
+        Treat preprocessor lines embedded in continuations like comments.
+        (f90-indent-line): Special-case preprocessor lines.  (Bug#13138)
+
 2012-12-11  Jay Belanger  <jay.p.belanger@gmail.com>
 
         * calc/calc.el (calc-standard-date-formats):  Add more date
diff --git a/lisp/progmodes/f90.el b/lisp/progmodes/f90.el
index f42952685d0..59dda170b77 100644
--- a/lisp/progmodes/f90.el
+++ b/lisp/progmodes/f90.el
@@ -1178,11 +1178,11 @@ and lies before point."
 
 (defsubst f90-line-continued ()
   "Return t if the current line is a continued one.
-This includes comment lines embedded in continued lines, but
-not the last line of a continued statement."
+This includes comment or preprocessor lines embedded in continued lines,
+but not the last line of a continued statement."
   (save-excursion
     (beginning-of-line)
-    (while (and (looking-at "[ \t]*\\(!\\|$\\)") (zerop (forward-line -1))))
+    (while (and (looking-at "[ \t]*\\([!#]\\|$\\)") (zerop (forward-line -1))))
     (end-of-line)
     (while (f90-in-comment)
       (search-backward "!" (line-beginning-position))
@@ -1832,11 +1832,15 @@ after indenting."
         (f90-indent-line-no)
       (setq no-line-number t)
       (skip-chars-forward " \t"))
-    (if (looking-at "!")
-        (setq indent (f90-comment-indent))
-      (and f90-smart-end (looking-at "end")
-           (f90-match-end))
-      (setq indent (f90-calculate-indent)))
+    ;; FIXME This means f90-calculate-indent gives different answers
+    ;; for comments and preprocessor lines to this function.
+    ;; Better to make f90-calculate-indent return the correct answer?
+    (cond ((looking-at "!") (setq indent (f90-comment-indent)))
+          ((looking-at "#") (setq indent 0))
+          (t
+           (and f90-smart-end (looking-at "end")
+                (f90-match-end))
+           (setq indent (f90-calculate-indent))))
     (or (= indent (current-column))
         (f90-indent-to indent no-line-number))
     ;; If initial point was within line's indentation,
@@ -1973,12 +1977,13 @@ If run in the middle of a line, the line is not broken."
           (f90-indent-to ind-curr))
       (while (and (f90-line-continued) (zerop (forward-line 1))
                   (< (point) end-region-mark))
-        (if (looking-at "[ \t]*!")
-            (f90-indent-to (f90-comment-indent))
-          (or (= (current-indentation)
-                 (+ ind-curr f90-continuation-indent))
-              (f90-indent-to
-               (+ ind-curr f90-continuation-indent) 'no-line-no)))))
+        (cond ((looking-at "[ \t]*#") (f90-indent-to 0))
+              ((looking-at "[ \t]*!") (f90-indent-to (f90-comment-indent)))
+              (t
+               (or (= (current-indentation)
+                      (+ ind-curr f90-continuation-indent))
+                   (f90-indent-to
+                    (+ ind-curr f90-continuation-indent) 'no-line-no))))))
     ;; Restore point, etc.
     (setq f90-cache-position nil)
     (goto-char save-point)
diff --git a/test/ChangeLog b/test/ChangeLog
index 7633d974f57..142dfcb42fd 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,7 @@
+2012-12-11  Glenn Morris  <rgm@gnu.org>
+
+        * automated/f90.el (f90-test-bug13138): New test.
+
 2012-12-10  Rüdiger Sonderfeld  <ruediger@c-plusplus.de>
 
         * automated/inotify-test.el: New test.
diff --git a/test/automated/f90.el b/test/automated/f90.el
index 25b77f07ad3..7f412568ae3 100644
--- a/test/automated/f90.el
+++ b/test/automated/f90.el
@@ -154,5 +154,23 @@ end module modname")
     (f90-indent-line)
     (should (= 0 (current-indentation)))))
 
+(ert-deftest f90-test-bug13138 ()
+  "Test for http://debbugs.gnu.org/13138 ."
+  (with-temp-buffer
+    (f90-mode)
+    (insert "program prog
+  integer :: i = &
+#ifdef foo
+       & 1
+#else
+       & 2
+#endif
+
+  write(*,*) i
+end program prog")
+    (goto-char (point-min))
+    (forward-line 2)
+    (f90-indent-subprogram)
+    (should (= 0 (current-indentation)))))
 
 ;;; f90.el ends here