fortran.el   [plain text]

;;; fortran.el --- Fortran mode for GNU Emacs

;; Copyright (c) 1986, 93, 94, 95, 97, 98, 99, 2000, 2001
;;   Free Software Foundation, Inc.

;; Author: Michael D. Prange <prange@erl.mit.edu>
;; Maintainer: Dave Love <fx@gnu.org>
;; Keywords: languages

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This mode is documented in the Emacs manual.
;;
;; Note that it is for editing Fortran77 or Fortran90 fixed source
;; form.  For editing Fortran 90 free format source, use `f90-mode'
;; (f90.el).  It is meant to support the GNU Fortran language
;; implemented by g77 (its extensions to Fortran77 and
;; interpretations, e.g. of blackslash in strings).

;;; History:

;; Fortran mode was upgraded by Stephen A. Wood (saw@cebaf.gov).

;; We acknowledge many contributions and valuable suggestions by
;; Lawrence R. Dodd, Ralf Fassel, Ralph Finch, Stephen Gildea,
;; Dr. Anil Gokhale, Ulrich Mueller, Mark Neale, Eric Prestemon,
;; Gary Sabot and Richard Stallman.

;;; Code:

;; Todo:

;; * Tidy it all up (more)!
;; * Implement insertion and removal of statement continuations in
;;   mixed f77/f90 style, with the first `&' past column 72 and the
;;   second in column 6.
;; * Support any other extensions to f77 grokked by GNU Fortran I've missed.

(defgroup fortran nil
  "Fortran mode for Emacs"
  :link '(custom-manual "(emacs)Fortran")
  :group 'languages)

(defgroup fortran-indent nil
  "Indentation variables in Fortran mode"
  :prefix "fortran-"
  :group 'fortran)

(defgroup fortran-comment nil
  "Comment-handling variables in Fortran mode"
  :prefix "fortran-"
  :group 'fortran)


;;;###autoload
(defcustom fortran-tab-mode-default nil
  "*Default tabbing/carriage control style for empty files in Fortran mode.
A value of t specifies tab-digit style of continuation control.
A value of nil specifies that continuation lines are marked
with a character in column 6."
  :type 'boolean
  :group 'fortran-indent)

;; Buffer local, used to display mode line.
(defcustom fortran-tab-mode-string nil
  "String to appear in mode line when TAB format mode is on."
  :type '(choice (const nil) string)
  :group 'fortran-indent)
(make-variable-buffer-local 'fortran-tab-mode-string)

(defcustom fortran-do-indent 3
  "*Extra indentation applied to DO blocks."
  :type 'integer
  :group 'fortran-indent)

(defcustom fortran-if-indent 3
  "*Extra indentation applied to IF blocks."
  :type 'integer
  :group 'fortran-indent)

(defcustom fortran-structure-indent 3
  "*Extra indentation applied to STRUCTURE, UNION, MAP and INTERFACE blocks."
  :type 'integer
  :group 'fortran-indent)

(defcustom fortran-continuation-indent 5
  "*Extra indentation applied to Fortran continuation lines."
  :type 'integer
  :group 'fortran-indent)

(defcustom fortran-comment-indent-style 'fixed
  "*How to indent comments.
nil forces comment lines not to be touched,
'fixed makes fixed comment indentation to `fortran-comment-line-extra-indent'
columns beyond `fortran-minimum-statement-indent-fixed' (for
`indent-tabs-mode' of nil) or `fortran-minimum-statement-indent-tab' (for
`indent-tabs-mode' of t), and 'relative indents to current
Fortran indentation plus `fortran-comment-line-extra-indent'."
  :type '(radio (const :tag "Untouched" nil) (const fixed) (const relative))
  :group 'fortran-indent)

(defcustom fortran-comment-line-extra-indent 0
  "*Amount of extra indentation for text within full-line comments."
  :type 'integer
  :group 'fortran-indent
  :group 'fortran-comment)

(defcustom fortran-comment-line-start "C"
  "*Delimiter inserted to start new full-line comment.
You might want to change this to \"*\", for instance."
  :version "21.1"
  :type 'string
  :group 'fortran-comment)

;; This used to match preprocessor lines too, but that messes up
;; filling and doesn't seem to be necessary.
(defcustom fortran-comment-line-start-skip
  "^[CcDd*!]\\(\\([^ \t\n]\\)\\2+\\)?[ \t]*"
  "*Regexp to match the start of a full-line comment."
  :version "21.1"
  :type 'regexp
  :group 'fortran-comment)

(defcustom fortran-minimum-statement-indent-fixed 6
  "*Minimum statement indentation for fixed format continuation style."
  :type 'integer
  :group 'fortran-indent)

(defcustom fortran-minimum-statement-indent-tab (max tab-width 6)
  "*Minimum statement indentation for TAB format continuation style."
  :type 'integer
  :group 'fortran-indent)

;; Note that this is documented in the v18 manuals as being a string
;; of length one rather than a single character.
;; The code in this file accepts either format for compatibility.
(defcustom fortran-comment-indent-char " "
  "*Single-character string inserted for Fortran comment indentation.
Normally a space."
  :type 'string
  :group 'fortran-comment)

(defcustom fortran-line-number-indent 1
  "*Maximum indentation for Fortran line numbers.
5 means right-justify them within their five-column field."
  :type 'integer
  :group 'fortran-indent)

(defcustom fortran-check-all-num-for-matching-do nil
  "*Non-nil causes all numbered lines to be treated as possible DO loop ends."
  :type 'boolean
  :group 'fortran)

(defcustom fortran-blink-matching-if nil
  "*Non-nil causes \\[fortran-indent-line] on ENDIF statement to blink on matching IF.
Also, from an ENDDO statement blink on matching DO [WHILE] statement."
  :type 'boolean
  :group 'fortran)

(defcustom fortran-continuation-string "$"
  "*Single-character string used for Fortran continuation lines.
In fixed format continuation style, this character is inserted in
column 6 by \\[fortran-split-line] to begin a continuation line.
Also, if \\[fortran-indent-line] finds this at the beginning of a line, it will
convert the line into a continuation line of the appropriate style.
Normally $."
  :type 'string
  :group 'fortran)

(defcustom fortran-comment-region "c$$$"
  "*String inserted by \\[fortran-comment-region] at start of each \
line in region."
  :type 'string
  :group 'fortran-comment)

(defcustom fortran-electric-line-number t
  "*Non-nil causes line number digits to be moved to the correct \
column as typed."
  :type 'boolean
  :group 'fortran)

(defvar fortran-column-ruler-fixed
  "0   4 6  10        20        30        40        5\
0        60        70\n\
\[   ]|{   |    |    |    |    |    |    |    |    \
\|    |    |    |    |}\n"
  "String displayed above current line by \\[fortran-column-ruler].
This variable used in fixed format mode.")

(defvar fortran-column-ruler-tab
  "0       810        20        30        40        5\
0        60        70\n\
\[   ]|  { |    |    |    |    |    |    |    |    \
\|    |    |    |    |}\n"
  "String displayed above current line by \\[fortran-column-ruler].
This variable used in TAB format mode.")

(defvar fortran-analyze-depth 100
  "Number of lines to scan to determine whether to use fixed or TAB \
format style.")

(defcustom fortran-break-before-delimiters t
  "*Non-nil causes filling to break lines before delimiters."
  :type 'boolean
  :group 'fortran)

(defvar fortran-mode-syntax-table
  (let ((table (make-syntax-table)))
    ;; We might like `;' to be punctuation (g77 multi-statement
    ;; lines), but that screws abbrevs.
    (modify-syntax-entry ?\; "w" table)
    (modify-syntax-entry ?\r " " table)
    (modify-syntax-entry ?+ "." table)
    (modify-syntax-entry ?- "." table)
    (modify-syntax-entry ?= "." table)
    (modify-syntax-entry ?* "." table)
    (modify-syntax-entry ?/ "." table)
    (modify-syntax-entry ?\' "\"" table)
    (modify-syntax-entry ?\" "\"" table)
    ;; Consistent with GNU Fortran -- see the manual.
    (modify-syntax-entry ?\\ "\\" table)
    ;; This might be better as punctuation, as for C, but this way you
    ;; can treat floating-point numbers as symbols.
    (modify-syntax-entry ?. "_" table)	; e.g. `a.ne.b'
    (modify-syntax-entry ?_ "_" table)
    (modify-syntax-entry ?$ "_" table)	; esp. VMSisms
    (modify-syntax-entry ?\! "<" table)
    (modify-syntax-entry ?\n ">" table)
    table)
  "Syntax table in use in Fortran mode buffers.")

;; Comments are real pain in Fortran because there is no way to
;; represent the standard comment syntax in an Emacs syntax table.
;; (We can do so for F90-style).  Therefore an unmatched quote in a
;; standard comment will throw fontification off on the wrong track.
;; So we do syntactic fontification with regexps.

(defvar fortran-font-lock-keywords-1 nil
  "Subdued level highlighting for Fortran mode.")

(defvar fortran-font-lock-keywords-2 nil
  "Medium level highlighting for Fortran mode.")

(defvar fortran-font-lock-keywords-3 nil
  "Gaudy level highlighting for Fortran mode.")

(defvar fortran-font-lock-syntactic-keywords nil
  "`font-lock-syntactic-keywords' for Fortran.
These get fixed-format comments fontified.")

(let ((comment-chars "cd\\*")		; `d' for `debugging' comments
      (fortran-type-types
       (eval-when-compile
	 (let ((re (regexp-opt
		    (let ((simple-types
			   '("character" "byte" "integer" "logical"
			     "none" "real" "complex"
			     "double precision" "double complex"))
			  (structured-types '("structure" "union" "map"))
			  (other-types '("record" "dimension"
					 "parameter" "common" "save"
					 "external" "intrinsic" "data"
					 "equivalence")))
		      (append
		       (mapcar (lambda (x) (concat "implicit " x))
			       simple-types)
		       simple-types
		       (mapcar (lambda (x) (concat "end " x))
			       structured-types)
		       structured-types
		       other-types)))))
	   ;; In the optimized regexp above, replace spaces by a
	   ;; regexp for optional whitespace; regexp-opt would have
	   ;; escaped that.
	   (mapconcat #'identity (split-string re) "[ \t]*"))))
      (fortran-keywords
       (eval-when-compile
         (regexp-opt '("continue" "format" "end" "enddo" "if" "then"
                       "else" "endif" "elseif" "while" "inquire" "stop"
                       "return" "include" "open" "close" "read" "write"
                       "format" "print" "select" "case" "cycle" "exit"
		       "rewind" "backspace"))))
      (fortran-logicals
       (eval-when-compile
         (regexp-opt '("and" "or" "not" "lt" "le" "eq" "ge" "gt" "ne"
                       "true" "false")))))
  (setq fortran-font-lock-syntactic-keywords
	;; Fixed format comments.  (!-style handled normally.)
	(list
	 (list (concat "^[" comment-chars "]") 0 '(11))
	 (list (concat "^[^" comment-chars "\t\n]" ".\\{71\\}"
		       "\\([^\n]+\\)")
	       1 '(11))))
  (setq fortran-font-lock-keywords-1
        (list
         ;; Program, subroutine and function declarations, plus calls.
         (list (concat "\\<\\(block[ \t]*data\\|call\\|entry\\|function\\|"
                       "program\\|subroutine\\)\\>[ \t]*\\(\\sw+\\)?")
               '(1 font-lock-keyword-face)
               '(2 font-lock-function-name-face nil t))))
  (setq fortran-font-lock-keywords-2
        (append fortran-font-lock-keywords-1
                (list
                 ;; Fontify all type specifiers (must be first; see below).
                 (cons (concat "\\<\\(" fortran-type-types "\\)\\>")
                       'font-lock-type-face)
                 ;; Fontify all builtin keywords (except logical, do
                 ;; and goto; see below).
                 (concat "\\<\\(" fortran-keywords "\\)\\>")
                 ;; Fontify all builtin operators.
                 (concat "\\.\\(" fortran-logicals "\\)\\.")
                 ;; Fontify do/goto keywords and targets, and goto tags.
                 (list "\\<\\(do\\|go *to\\)\\>[ \t]*\\([0-9]+\\)?"
                       '(1 font-lock-keyword-face)
                       '(2 font-lock-constant-face nil t))
                 (cons "^ *\\([0-9]+\\)" 'font-lock-constant-face))))
  (setq fortran-font-lock-keywords-3
        (append
         ;; The list `fortran-font-lock-keywords-1'.
         fortran-font-lock-keywords-1
         ;; Fontify all type specifiers plus their declared items.
         (list
          (list (concat "\\<\\(" fortran-type-types "\\)\\>[ \t(/]*\\(*\\)?")
                ;; Fontify the type specifier.
                '(1 font-lock-type-face)
                ;; Fontify each declaration item (or just the /.../ block name).
                `(font-lock-match-c-style-declaration-item-and-skip-to-next
                  ;; Start after any *(...) expression.
                  (condition-case nil
		      (and (and (match-beginning ,(+ 2 (regexp-opt-depth
							fortran-type-types)))
				(forward-sexp))
			   (forward-sexp))
		    (error nil))
                  ;; No need to clean up.
                  nil
                  ;; Fontify as a variable name, functions are
                  ;; fontified elsewhere.
                  (1 font-lock-variable-name-face nil t))))
         ;; Things extra to `fortran-font-lock-keywords-3'
         ;; (must be done first).
         (list
          ;; Fontify goto-like `err=label'/`end=label' in read/write
          ;; statements.
          '(", *\\(e\\(nd\\|rr\\)\\)\\> *\\(= *\\([0-9]+\\)\\)?"
            (1 font-lock-keyword-face) (4 font-lock-constant-face nil t))
          ;; Highlight standard continuation character and in a
          ;; TAB-formatted line.
          '("^     \\([^ 0]\\)" 1 font-lock-string-face)
          '("^\t\\([1-9]\\)" 1 font-lock-string-face))
	 (list
	  ;; cpp stuff (ugh)
	  '("^# *[a-z]+" . font-lock-keyword-face))
         ;; The list `fortran-font-lock-keywords-2' less that for types
         ;; (see above).
         (cdr (nthcdr (length fortran-font-lock-keywords-1)
                      fortran-font-lock-keywords-2)))))

(defvar fortran-font-lock-keywords fortran-font-lock-keywords-1
  "Default expressions to highlight in Fortran mode.")

(defvar fortran-imenu-generic-expression
  ;; These patterns could be confused by sequence nos. in cols 72+ and
  ;; don't allow continuations everywhere.
  (list
   (list
    nil
    ;; [This will be fooled by `end function' allowed by G77.  Also,
    ;; it assumes sensible whitespace is employed.]
    (concat
     ;; leading whitespace:
     "^\\s-+\\("
     ;; function declaration with optional type, e.g. `real',
     ;; `real*4', character(*), `double precision':
     "\\(\\sw\\|\\s-\\|[*()+]\\)*"
     "\\<function\\|subroutine\\|entry\\|block\\s-*data\\|program\\)"
     ;; Possible statement continuation:
     "[ \t" fortran-continuation-string "]+"
     ;; Variable to index:
     "\\(\\sw+\\)")
    3)
   ;; Un-named block data
   (list nil "^\\s-+\\(block\\s-*data\\)\\s-*$" 1))
  "Imenu generic expression for `imenu-default-create-index-function'.")

(defvar fortran-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map ";" 'fortran-abbrev-start)
    (define-key map "\C-c;" 'fortran-comment-region)
    (define-key map "\M-;" 'fortran-indent-comment)
    (define-key map "\M-\n" 'fortran-split-line)
    (define-key map "\M-\C-q" 'fortran-indent-subprogram)
    (define-key map "\C-c\C-w" 'fortran-window-create-momentarily)
    (define-key map "\C-c\C-r" 'fortran-column-ruler)
    (define-key map "\C-c\C-p" 'fortran-previous-statement)
    (define-key map "\C-c\C-n" 'fortran-next-statement)
    (define-key map "\C-c\C-d" 'fortran-join-line) ; like f90
    (define-key map "\M-^" 'fortran-join-line) ; subvert delete-indentation
    (define-key map "0" 'fortran-electric-line-number)
    (define-key map "1" 'fortran-electric-line-number)
    (define-key map "2" 'fortran-electric-line-number)
    (define-key map "3" 'fortran-electric-line-number)
    (define-key map "4" 'fortran-electric-line-number)
    (define-key map "5" 'fortran-electric-line-number)
    (define-key map "6" 'fortran-electric-line-number)
    (define-key map "7" 'fortran-electric-line-number)
    (define-key map "8" 'fortran-electric-line-number)
    (define-key map "9" 'fortran-electric-line-number)

    ;; Menu
    (easy-menu-define
     fortran-mode-menu map ""
     `("Fortran"
       ["Manual" (info "(emacs)Fortran")]
       ("Customization"
	,(custom-menu-create 'fortran)
	["Set" Custom-set t]
	["Save" Custom-save t]
	["Reset to Current" Custom-reset-current t]
	["Reset to Saved" Custom-reset-saved t]
	["Reset to Standard Settings" Custom-reset-standard t])
       "----"
       ["Toggle Auto-fill" auto-fill-mode :style toggle
	:selected auto-fill-function]
       ["Toggle abbrev-mode" abbrev-mode :style toggle :selected abbrev-mode]
       "----"
       ["Comment-out Region" fortran-comment-region mark-active]
       ["Uncomment-out region"
	(fortran-comment-region (region-beginning) (region-end) 1)
	mark-active]
       ["Indent Region" indent-region mark-active]
       ["Indent Subprogram" fortran-indent-subprogram t]
       "----"
       ["Beginning of Subprogram" fortran-beginning-of-subprogram t]
       ["End of Subprogram" fortran-end-of-subprogram t]
       ("Mark"
	["Subprogram" mark-defun t]
	["IF Block" fortran-mark-if t]
	["DO Block" fortran-mark-do t])
       ["Narrow to Subprogram" narrow-to-defun t]
       ["Widen" widen t]
       "----"
       ["Temporary column ruler" fortran-column-ruler t]
       ["72-column window" fortran-window-create t]
       ["Full Width Window"
	(enlarge-window-horizontally (- (frame-width) (window-width)))
	(< (window-width) (frame-width))]
       ["Momentary 72-column window" fortran-window-create-momentarily t]
       "----"
       ["Break Line at Point" fortran-split-line t]
       ["Join Line" fortran-join-line t]
       ["Fill Statement/Comment" fill-paragraph  t]
       "----"
       ["Add imenu menu"
	imenu-add-menubar-index (not (and (boundp 'imenu--index-alist)
					  imenu--index-alist))]))
    map)
  "Keymap used in Fortran mode.")

(defvar fortran-mode-abbrev-table
  (let ((ac abbrevs-changed))
    (define-abbrev-table 'fortran-mode-abbrev-table ())
    (define-abbrev fortran-mode-abbrev-table  ";au"  "automatic" nil)
    (define-abbrev fortran-mode-abbrev-table  ";b"   "byte" nil)
    (define-abbrev fortran-mode-abbrev-table  ";bd"  "block data" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ch"  "character" nil)
    (define-abbrev fortran-mode-abbrev-table  ";cl"  "close" nil)
    (define-abbrev fortran-mode-abbrev-table  ";c"   "continue" nil)
    (define-abbrev fortran-mode-abbrev-table  ";cm"  "common" nil)
    (define-abbrev fortran-mode-abbrev-table  ";cx"  "complex" nil)
    (define-abbrev fortran-mode-abbrev-table  ";df"  "define" nil)
    (define-abbrev fortran-mode-abbrev-table  ";di"  "dimension" nil)
    (define-abbrev fortran-mode-abbrev-table  ";do"  "double" nil)
    (define-abbrev fortran-mode-abbrev-table  ";dc"  "double complex" nil)
    (define-abbrev fortran-mode-abbrev-table  ";dp"  "double precision" nil)
    (define-abbrev fortran-mode-abbrev-table  ";dw"  "do while" nil)
    (define-abbrev fortran-mode-abbrev-table  ";e"   "else" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ed"  "enddo" nil)
    (define-abbrev fortran-mode-abbrev-table  ";el"  "elseif" nil)
    (define-abbrev fortran-mode-abbrev-table  ";en"  "endif" nil)
    (define-abbrev fortran-mode-abbrev-table  ";eq"  "equivalence" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ew"  "endwhere" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ex"  "external" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ey"  "entry" nil)
    (define-abbrev fortran-mode-abbrev-table  ";f"   "format" nil)
    (define-abbrev fortran-mode-abbrev-table  ";fa"  ".false." nil)
    (define-abbrev fortran-mode-abbrev-table  ";fu"  "function" nil)
    (define-abbrev fortran-mode-abbrev-table  ";g"   "goto" nil)
    (define-abbrev fortran-mode-abbrev-table  ";im"  "implicit" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ib"  "implicit byte" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ic"  "implicit complex" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ich" "implicit character" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ii"  "implicit integer" nil)
    (define-abbrev fortran-mode-abbrev-table  ";il"  "implicit logical" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ir"  "implicit real" nil)
    (define-abbrev fortran-mode-abbrev-table  ";inc" "include" nil)
    (define-abbrev fortran-mode-abbrev-table  ";in"  "integer" nil)
    (define-abbrev fortran-mode-abbrev-table  ";intr" "intrinsic" nil)
    (define-abbrev fortran-mode-abbrev-table  ";l"   "logical" nil)
    (define-abbrev fortran-mode-abbrev-table  ";n"   "namelist" nil)
    (define-abbrev fortran-mode-abbrev-table  ";o"   "open" nil) ; was ;op
    (define-abbrev fortran-mode-abbrev-table  ";pa"  "parameter" nil)
    (define-abbrev fortran-mode-abbrev-table  ";pr"  "program" nil)
    (define-abbrev fortran-mode-abbrev-table  ";ps"  "pause" nil)
    (define-abbrev fortran-mode-abbrev-table  ";p"   "print" nil)
    (define-abbrev fortran-mode-abbrev-table  ";rc"  "record" nil)
    (define-abbrev fortran-mode-abbrev-table  ";re"  "real" nil)
    (define-abbrev fortran-mode-abbrev-table  ";r"   "read" nil)
    (define-abbrev fortran-mode-abbrev-table  ";rt"  "return" nil)
    (define-abbrev fortran-mode-abbrev-table  ";rw"  "rewind" nil)
    (define-abbrev fortran-mode-abbrev-table  ";s"   "stop" nil)
    (define-abbrev fortran-mode-abbrev-table  ";sa"  "save" nil)
    (define-abbrev fortran-mode-abbrev-table  ";st"  "structure" nil)
    (define-abbrev fortran-mode-abbrev-table  ";sc"  "static" nil)
    (define-abbrev fortran-mode-abbrev-table  ";su"  "subroutine" nil)
    (define-abbrev fortran-mode-abbrev-table  ";tr"  ".true." nil)
    (define-abbrev fortran-mode-abbrev-table  ";ty"  "type" nil)
    (define-abbrev fortran-mode-abbrev-table  ";vo"  "volatile" nil)
    (define-abbrev fortran-mode-abbrev-table  ";w"   "write" nil)
    (define-abbrev fortran-mode-abbrev-table  ";wh"  "where" nil)
    (setq abbrevs-changed ac)
    fortran-mode-abbrev-table))

(eval-when-compile			; silence compiler
  (defvar imenu-case-fold-search)
  (defvar imenu-syntax-alist))

(defcustom fortran-mode-hook nil
  "Hook run by Fortran mode."
  :type 'hook
  :group 'fortran)

;;;###autoload
(defun fortran-mode ()
  "Major mode for editing Fortran code.
\\[fortran-indent-line] indents the current Fortran line correctly.
DO statements must not share a common CONTINUE.

Type ;? or ;\\[help-command] to display a list of built-in abbrevs for
Fortran keywords.

Key definitions:
\\{fortran-mode-map}

Variables controlling indentation style and extra features:

 `comment-start'
    If you want to use comments starting with `!',
    set this to the string \"!\".
 `fortran-do-indent'
    Extra indentation within do blocks.  (default 3)
 `fortran-if-indent'
    Extra indentation within if blocks.  (default 3)
 `fortran-structure-indent'
    Extra indentation within structure, union, map and interface blocks.
    (default 3)
 `fortran-continuation-indent'
    Extra indentation applied to continuation statements.  (default 5)
 `fortran-comment-line-extra-indent'
    Amount of extra indentation for text within full-line comments.  (default 0)
 `fortran-comment-indent-style'
    nil    means don't change indentation of text in full-line comments,
    fixed  means indent that text at `fortran-comment-line-extra-indent' beyond
           the value of `fortran-minimum-statement-indent-fixed' (for fixed
           format continuation style) or `fortran-minimum-statement-indent-tab'
           (for TAB format continuation style).
    relative  means indent at `fortran-comment-line-extra-indent' beyond the
 	      indentation for a line of code.
    (default 'fixed)
 `fortran-comment-indent-char'
    Single-character string to be inserted instead of space for
    full-line comment indentation.  (default \" \")
 `fortran-minimum-statement-indent-fixed'
    Minimum indentation for Fortran statements in fixed format mode.  (def.6)
 `fortran-minimum-statement-indent-tab'
    Minimum indentation for Fortran statements in TAB format mode.  (default 9)
 `fortran-line-number-indent'
    Maximum indentation for line numbers.  A line number will get
    less than this much indentation if necessary to avoid reaching
    column 5.  (default 1)
 `fortran-check-all-num-for-matching-do'
    Non-nil causes all numbered lines to be treated as possible \"continue\"
    statements.  (default nil)
 `fortran-blink-matching-if'
    Non-nil causes \\[fortran-indent-line] on an ENDIF statement to blink on
    matching IF.  Also, from an ENDDO statement, blink on matching DO [WHILE]
    statement.  (default nil)
 `fortran-continuation-string'
    Single-character string to be inserted in column 5 of a continuation
    line.  (default \"$\")
 `fortran-comment-region'
    String inserted by \\[fortran-comment-region] at start of each line in
    region.  (default \"c$$$\")
 `fortran-electric-line-number'
    Non-nil causes line number digits to be moved to the correct column
    as typed.  (default t)
 `fortran-break-before-delimiters'
    Non-nil causes lines to be broken before delimiters.
    (default t)

Turning on Fortran mode calls the value of the variable `fortran-mode-hook'
with no args, if that value is non-nil."
  (interactive)
  (kill-all-local-variables)
  (setq local-abbrev-table fortran-mode-abbrev-table)
  (set-syntax-table fortran-mode-syntax-table)
  ;; Font Lock mode support.
  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults '((fortran-font-lock-keywords
			      fortran-font-lock-keywords-1
			      fortran-font-lock-keywords-2
			      fortran-font-lock-keywords-3)
			     nil t ((?/ . "$/") ("_$" . "w"))
			     fortran-beginning-of-subprogram))
  (set (make-local-variable 'font-lock-syntactic-keywords)
       fortran-font-lock-syntactic-keywords)
  (make-local-variable 'fortran-break-before-delimiters)
  (setq fortran-break-before-delimiters t)
  (make-local-variable 'indent-line-function)
  (setq indent-line-function 'fortran-indent-line)
  (make-local-variable 'comment-indent-function)
  (setq comment-indent-function 'fortran-comment-indent)
  (make-local-variable 'comment-start-skip)
  (setq comment-start-skip "![ \t]*")
  (make-local-variable 'comment-start)
  (setq comment-start fortran-comment-line-start)
  (make-local-variable 'require-final-newline)
  (setq require-final-newline t)
  (make-local-variable 'abbrev-all-caps)
  (setq abbrev-all-caps t)
  (make-local-variable 'indent-tabs-mode)
  (setq indent-tabs-mode nil)
;;;(setq abbrev-mode t) ; ?? (abbrev-mode 1) instead??
  (set (make-local-variable 'fill-column) 72)
  (use-local-map fortran-mode-map)
  (setq mode-name "Fortran")
  (setq major-mode 'fortran-mode)
  (make-local-variable 'fortran-comment-line-extra-indent)
  (make-local-variable 'fortran-minimum-statement-indent-fixed)
  (make-local-variable 'fortran-minimum-statement-indent-tab)
  (make-local-variable 'fortran-column-ruler-fixed)
  (make-local-variable 'fortran-column-ruler-tab)
  (setq fortran-tab-mode-string " TAB-format")
  (setq indent-tabs-mode (fortran-analyze-file-format))
  (setq imenu-case-fold-search t)
  (setq imenu-generic-expression fortran-imenu-generic-expression)
  (setq imenu-syntax-alist '(("_$" . "w")))
  (set (make-local-variable 'fill-paragraph-function) 'fortran-fill-paragraph)
  (set (make-local-variable 'normal-auto-fill-function) 'fortran-auto-fill)
  (set (make-local-variable 'indent-line-function) 'fortran-indent-line)
  (set (make-local-variable 'indent-region-function)
       (lambda (start end)
         (let (fortran-blink-matching-if ; avoid blinking delay
               indent-region-function)
           (indent-region start end nil))))
  (set (make-local-variable 'beginning-of-defun-function)
       #'fortran-beginning-of-subprogram)
  (set (make-local-variable 'end-of-defun-function)
       #'fortran-end-of-subprogram)
  (set (make-local-variable 'add-log-current-defun-function)
       #'fortran-current-defun)
  (set (make-local-variable 'dabbrev-case-fold-search) 'case-fold-search)
  (run-hooks 'fortran-mode-hook))

(defsubst fortran-comment-indent ()
  (save-excursion
    (skip-chars-backward " \t")
    (max (+ 1 (current-column))
	 comment-column)))

(defun fortran-indent-comment ()
  "Align or create comment on current line.
Existing comments of all types are recognized and aligned.
If the line has no comment, a side-by-side comment is inserted and aligned
if the value of  `comment-start'  is not nil.
Otherwise, a separate-line comment is inserted, on this line
or on a new line inserted before this line if this line is not blank."
  (interactive)
  (beginning-of-line)
  ;; Recognize existing comments of either kind.
  (cond ((looking-at fortran-comment-line-start-skip)
	 (fortran-indent-line))
	((fortran-find-comment-start-skip) ; catches any inline comment and
					; leaves point after comment-start-skip
	 (if comment-start-skip
	     (progn (goto-char (match-beginning 0))
		    (if (not (= (current-column)
				(fortran-comment-indent)))
			(progn (delete-horizontal-space)
			       (indent-to (fortran-comment-indent)))))
	   (end-of-line)))        ; otherwise goto end of line or sth else?
	;; No existing comment.
	;; If side-by-side comments are defined, insert one,
	;; unless line is now blank.
	((and comment-start (not (looking-at "^[ \t]*$")))
	 (end-of-line)
	 (delete-horizontal-space)
	 (indent-to (fortran-comment-indent))
	 (insert comment-start))
	;; Else insert separate-line comment, making a new line if nec.
	(t
	 (if (looking-at "^[ \t]*$")
	     (delete-horizontal-space)
	   (beginning-of-line)
	   (insert ?\n)
	   (forward-char -1))
	 (insert fortran-comment-line-start)
	 (insert-char (if (stringp fortran-comment-indent-char)
			  (aref fortran-comment-indent-char 0)
			fortran-comment-indent-char)
		      (- (fortran-calculate-indent) (current-column))))))

(defun fortran-comment-region (beg-region end-region arg)
  "Comments every line in the region.
Puts `fortran-comment-region' at the beginning of every line in the region.
BEG-REGION and END-REGION are args which specify the region boundaries.
With non-nil ARG, uncomments the region."
  (interactive "*r\nP")
  (let ((end-region-mark (copy-marker end-region))
	(save-point (point-marker)))
    (goto-char beg-region)
    (beginning-of-line)
    (if (not arg)			;comment the region
	(progn (insert fortran-comment-region)
	       (while (and  (= (forward-line 1) 0)
			    (< (point) end-region-mark))
		 (insert fortran-comment-region)))
      (let ((com (regexp-quote fortran-comment-region))) ;uncomment the region
	(if (looking-at com)
	    (delete-region (point) (match-end 0)))
	(while (and  (= (forward-line 1) 0)
		     (< (point) end-region-mark))
	  (if (looking-at com)
	      (delete-region (point) (match-end 0))))))
    (goto-char save-point)
    (set-marker end-region-mark nil)
    (set-marker save-point nil)))

(defun fortran-abbrev-start ()
  "Typing ;\\[help-command] or ;? lists all the Fortran abbrevs.
Any other key combination is executed normally."
  (interactive)
  (let (c)
    (insert last-command-char)
    (if (or (eq (setq c (read-event)) ??)    ;insert char if not equal to `?'
	    (eq c help-char))
	(fortran-abbrev-help)
      (setq unread-command-events (list c)))))

(defun fortran-abbrev-help ()
  "List the currently defined abbrevs in Fortran mode."
  (interactive)
  (message "Listing abbrev table...")
  (display-buffer (fortran-prepare-abbrev-list-buffer))
  (message "Listing abbrev table...done"))

(defun fortran-prepare-abbrev-list-buffer ()
  (save-excursion
    (set-buffer (get-buffer-create "*Abbrevs*"))
    (erase-buffer)
    (insert-abbrev-table-description 'fortran-mode-abbrev-table t)
    (goto-char (point-min))
    (set-buffer-modified-p nil)
    (edit-abbrevs-mode))
  (get-buffer-create "*Abbrevs*"))

(defun fortran-column-ruler ()
  "Insert a column ruler momentarily above current line, till next keystroke.
The ruler is defined by the value of `fortran-column-ruler-fixed' when in fixed
format mode, and `fortran-column-ruler-tab' when in TAB format mode.
The key typed is executed unless it is SPC."
  (interactive)
  (momentary-string-display
   (if indent-tabs-mode
       fortran-column-ruler-tab
     fortran-column-ruler-fixed)
   (save-excursion
     (beginning-of-line)
     (if (eq (window-start (selected-window))
	     (window-point (selected-window)))
	 (line-beginning-position 2)
       (point)))
   nil "Type SPC or any command to erase ruler."))

(defun fortran-window-create ()
  "Make the window 72 columns wide.
See also `fortran-window-create-momentarily'."
  (interactive)
  (condition-case error
      (progn
	(let ((window-min-width 2))
	  (if (< (window-width) (frame-width))
	      (enlarge-window-horizontally (- (frame-width)
					      (window-width) 1)))
	  (let* ((window-edges (window-edges))
		 (scroll-bar-width (- (nth 2 window-edges)
				      (car window-edges)
				      (window-width))))
	    (split-window-horizontally (+ 72 scroll-bar-width)))
	  (other-window 1)
	  (switch-to-buffer " fortran-window-extra" t)
	  (select-window (previous-window))))
    (error (message "No room for Fortran window")
	   'error)))

(defun fortran-window-create-momentarily (&optional arg)
  "Momentarily make the window 72 columns wide.
Optional ARG non-nil and non-unity disables the momentary feature.
See also `fortran-window-create'."
  (interactive "p")
  (if (or (not arg)
	  (= arg 1))
      (save-window-excursion
	(if (not (equal (fortran-window-create) 'error))
	    (progn (message "Type SPC to continue editing.")
		   (let ((char (read-event)))
		     (or (equal char (string-to-char " "))
			 (setq unread-command-events (list char)))))))
    (fortran-window-create)))

(defun fortran-split-line ()
  "Break line at point and insert continuation marker and alignment."
  (interactive)
  (delete-horizontal-space)
  (if (save-excursion
	(beginning-of-line)
	(looking-at fortran-comment-line-start-skip))
      (insert ?\n fortran-comment-line-start ? )
    (if indent-tabs-mode
	(insert ?\n ?\t (fortran-numerical-continuation-char))
      (insert "\n " fortran-continuation-string))) ; Space after \n important
  (fortran-indent-line))		; when the cont string is C, c or *.

(defun fortran-remove-continuation ()
  (if (looking-at "\\(     [^ 0\n]\\|\t[1-9]\\|&\\)")
      (progn (replace-match "")
	     (delete-indentation)
	     t)))

(defun fortran-join-line (arg)
  "Join current line to the previous one and re-indent.
With a prefix argument, repeat this operation that many times.
If the prefix argument ARG is negative, join the next -ARG lines.
Continuation lines are correctly handled."
  (interactive "*p")
  (save-excursion
    (when (> 0 arg)
      (setq arg (- arg))
      (forward-line arg))
    (while (not (zerop arg))
      (beginning-of-line)
      (or (fortran-remove-continuation)
          (delete-indentation))
      (setq arg (1- arg)))
    (fortran-indent-line)))

(defun fortran-numerical-continuation-char ()
  "Return a digit for tab-digit style of continuation lines.
If, previous line is a tab-digit continuation line, returns that digit
plus one.  Otherwise return 1.  Zero not allowed."
  (save-excursion
    (forward-line -1)
    (if (looking-at "\t[1-9]")
	(+ ?1 (% (- (char-after (+ (point) 1)) ?0) 9))
      ?1)))

(put 'fortran-electric-line-number 'delete-selection t)
(defun fortran-electric-line-number (arg)
  "Self insert, but if part of a Fortran line number indent it automatically.
Auto-indent does not happen if a numeric ARG is used."
  (interactive "P")
  (if (or arg (not fortran-electric-line-number))
      (if arg
	  (self-insert-command (prefix-numeric-value arg))
	(self-insert-command 1))
    (if (or (and (= 5 (current-column))
		 (save-excursion
		   (beginning-of-line)
		   (looking-at " \\{5\\}"))) ;In col 5 with only spaces to left.
	    (and (= (if indent-tabs-mode
			fortran-minimum-statement-indent-tab
		      fortran-minimum-statement-indent-fixed) (current-column))
		 (eq ?\t (char-after (line-beginning-position))) ;In col 8
					; with a single tab to the left.
		 (not (or (eq last-command 'fortran-indent-line)
			  (eq last-command
			      'fortran-indent-new-line))))
	    (save-excursion
	      (re-search-backward "[^ \t0-9]"
				  (line-beginning-position)
				  t))	;not a line number
	    (looking-at "[0-9]"))	;within a line number
	(self-insert-command (prefix-numeric-value arg))
      (skip-chars-backward " \t")
      (insert last-command-char)
      (fortran-indent-line))))

(defvar fortran-end-prog-re1
  "end\
\\([ \t]*\\(program\\|subroutine\\|function\\|block[ \t]*data\\)\\>\
\\([ \t]*\\(\\sw\\|\\s_\\)+\\)?\\)?")
(defvar fortran-end-prog-re
  (concat "^[ \t0-9]*" fortran-end-prog-re1)
  "Regexp possibly marking subprogram end.")

(defun fortran-check-end-prog-re ()
  "Check a preliminary match against `fortran-end-prog-re'."
  ;; Having got a possible match for the subprogram end, we need a
  ;; match of whitespace, avoiding possible column 73+ stuff.
  (save-match-data
    (string-match "^\\s-*\\(\\'\\|\\s<\\)"
		  (buffer-substring (match-end 0)
				    (min (line-end-position)
					 (+ 72 (line-beginning-position)))))))

;; Note that you can't just check backwards for `subroutine' &c in
;; case of un-marked main programs not at the start of the file.
(defun fortran-beginning-of-subprogram ()
  "Move point to the beginning of the current Fortran subprogram."
  (interactive)
  (save-match-data
    (let ((case-fold-search t))
      (beginning-of-line -1)
      (if (catch 'ok
	    (while (re-search-backward fortran-end-prog-re nil 'move)
	      (if (fortran-check-end-prog-re)
		  (throw 'ok t))))
	  (forward-line)))))

(defun fortran-end-of-subprogram ()
  "Move point to the end of the current Fortran subprogram."
  (interactive)
  (save-match-data
    (let ((case-fold-search t))
      (if (save-excursion		; on END
	    (beginning-of-line)
	    (and (looking-at fortran-end-prog-re)
		 (fortran-check-end-prog-re)))
	  (forward-line)
	(beginning-of-line 2)
	(catch 'ok
	  (while (re-search-forward fortran-end-prog-re nil 'move)
	    (if (fortran-check-end-prog-re)
		(throw 'ok t))))
	(goto-char (match-beginning 0))
	(forward-line)))))

(defun fortran-previous-statement ()
  "Move point to beginning of the previous Fortran statement.
Returns `first-statement' if that statement is the first
non-comment Fortran statement in the file, and nil otherwise."
  (interactive)
  (let (not-first-statement continue-test)
    (beginning-of-line)
    (setq continue-test
	  (and
	   (not (looking-at fortran-comment-line-start-skip))
	   (or (looking-at
	        (concat "[ \t]*"
			(regexp-quote fortran-continuation-string)))
	       (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))))
    (while (and (setq not-first-statement (= (forward-line -1) 0))
		(or (looking-at fortran-comment-line-start-skip)
		    (looking-at "[ \t]*$\\| \\{5\\}[^ 0\n]\\|\t[1-9]")
		    (looking-at (concat "[ \t]*" comment-start-skip)))))
    (cond ((and continue-test
		(not not-first-statement))
	   (message "Incomplete continuation statement."))
	  (continue-test
	   (fortran-previous-statement))
	  ((not not-first-statement)
	   'first-statement))))

(defun fortran-next-statement ()
  "Move point to beginning of the next Fortran statement.
Returns `last-statement' if that statement is the last
non-comment Fortran statement in the file, and nil otherwise."
  (interactive)
  (let (not-last-statement)
    (beginning-of-line)
    (while (and (setq not-last-statement
		      (and (= (forward-line 1) 0)
			   (not (eobp))))
 		(or (looking-at fortran-comment-line-start-skip)
 		    (looking-at "[ \t]*$\\|     [^ 0\n]\\|\t[1-9]")
 		    (looking-at (concat "[ \t]*" comment-start-skip)))))
    (if (not not-last-statement)
 	'last-statement)))

(defun fortran-blink-match (regex keyword find-begin)
  "From a line matching REGEX, blink matching KEYWORD statement line.
Use function FIND-BEGIN to match it."
  (let ((top-of-window (window-start))
	(end-point (point))
	(case-fold-search t)
	matching
	message)
    (if (save-excursion
	  (beginning-of-line)
	  (skip-chars-forward " \t0-9")
	  (looking-at regex))
	(progn
          (if (not (setq matching (funcall find-begin)))
              (setq message (concat "No matching " keyword "."))
            (if (< matching top-of-window)
                (save-excursion
                  (goto-char matching)
                  (beginning-of-line)
                  (setq message
                        (concat "Matches "
                                (buffer-substring (point)
						  (line-end-position)))))))
	  (if message
	      (message "%s" message)
	    (goto-char matching)
	    (sit-for 1)
	    (goto-char end-point))))))

(defun fortran-blink-matching-if ()
  "From an ENDIF or ELSE statement, blink the matching IF statement."
  (fortran-blink-match "e\\(nd[ \t]*if\\|lse\\([ \t]*if\\)?\\)\\b"
		       "if" #'fortran-beginning-if))

(defun fortran-blink-matching-do ()
  "From an ENDDO statement, blink the matching DO or DO WHILE statement."
  (fortran-blink-match "end[ \t]*do\\b" "do" #'fortran-beginning-do))

(defun fortran-mark-do ()
  "Put mark at end of Fortran DO [WHILE]-ENDDO construct, point at beginning.
The marks are pushed."
  (interactive)
  (let (enddo-point do-point)
    (if (setq enddo-point (fortran-end-do))
        (if (not (setq do-point (fortran-beginning-do)))
            (message "No matching do.")
          (goto-char enddo-point)
          (push-mark)
          (goto-char do-point)))))

(defun fortran-end-do ()
  "Search forward for first unmatched ENDDO.
Return point or nil."
  (let ((case-fold-search t))
    (if (save-excursion (beginning-of-line)
			(skip-chars-forward " \t0-9")
			(looking-at "end[ \t]*do\\b"))
	;; Sitting on one.
	(match-beginning 0)
      ;; Search for one.
      (save-excursion
	(let ((count 1))
	  (while (and (not (= count 0))
		      (not (eq (fortran-next-statement) 'last-statement))
		      ;; Keep local to subprogram
		      (not (and (looking-at fortran-end-prog-re)
				(fortran-check-end-prog-re))))
	    (skip-chars-forward " \t0-9")
	    (cond ((looking-at "end[ \t]*do\\b")
		   (setq count (1- count)))
		  ((looking-at
		    "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+[^0-9]")
		   (setq count (+ count 1)))))
	  (and (= count 0)
	       ;; All pairs accounted for.
	       (point)))))))

(defun fortran-beginning-do ()
  "Search backwards for first unmatched DO [WHILE].
Return point or nil."
  (let ((case-fold-search t))
    (if (save-excursion
	  (beginning-of-line)
	  (skip-chars-forward " \t0-9")
	  (looking-at "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+"))
	;; Sitting on one.
	(match-beginning 0)
      ;; Search for one.
      (save-excursion
	(let ((count 1))
	  (while (and (not (= count 0))
		      (not (eq (fortran-previous-statement) 'first-statement))
		      ;; Keep local to subprogram
		      (not (and (looking-at fortran-end-prog-re)
				(fortran-check-end-prog-re))))
	    (skip-chars-forward " \t0-9")
	    (cond ((looking-at
		    "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+[0-9]")
		   (setq count (1- count)))
		  ((looking-at "end[ \t]*do\\b")
		   (setq count (1+ count)))))
	  (and (= count 0)
	       ;; All pairs accounted for.
	       (point)))))))

(defun fortran-mark-if ()
  "Put mark at end of Fortran IF-ENDIF construct, point at beginning.
The marks are pushed."
  (interactive)
  (let (endif-point if-point)
    (if (setq endif-point (fortran-end-if))
        (if (not (setq if-point (fortran-beginning-if)))
            (message "No matching if.")
          ;; Set mark, move point.
          (goto-char endif-point)
          (push-mark)
          (goto-char if-point)))))

(defvar fortran-if-start-re "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?if[ \t]*(")

(defun fortran-end-if ()
  "Search forwards for first unmatched ENDIF.
Return point or nil."
  (let ((case-fold-search t))
    (if (save-excursion (beginning-of-line)
			(skip-chars-forward " \t0-9")
			(looking-at "end[ \t]*if\\b"))
	;; Sitting on one.
	(match-beginning 0)
      ;; Search for one.  The point has been already been moved to first
      ;; letter on line but this should not cause troubles.
      (save-excursion
	(let ((count 1))
	  (while (and (not (= count 0))
		      (not (eq (fortran-next-statement) 'last-statement))
		      ;; Keep local to subprogram.
		      (not (and (looking-at fortran-end-prog-re)
				(fortran-check-end-prog-re))))
	    (skip-chars-forward " \t0-9")
	    (cond ((looking-at "end[ \t]*if\\b")
		   (setq count (- count 1)))
		  ((looking-at fortran-if-start-re)
		   (save-excursion
		     (if (or
			  (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
			  (let (then-test) ; Multi-line if-then.
			    (while
				(and
				 (= (forward-line 1) 0)
				 ;; Search forward for then.
				 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
				 (not
				  (setq then-test
					(looking-at
					 ".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
			    then-test))
			 (setq count (+ count 1)))))))
	  (and (= count 0)
	       ;; All pairs accounted for.
	       (point)))))))

(defun fortran-beginning-if ()
  "Search backwards for first unmatched IF-THEN.
Return point or nil."
  (let ((case-fold-search t))
    (if (save-excursion
	  ;; May be sitting on multi-line if-then statement, first
	  ;; move to beginning of current statement.  Note:
	  ;; `fortran-previous-statement' moves to previous statement
	  ;; *unless* current statement is first one.  Only move
	  ;; forward if not first-statement.
	  (if (not (eq (fortran-previous-statement) 'first-statement))
	      (fortran-next-statement))
	  (skip-chars-forward " \t0-9")
	  (and
	   (looking-at fortran-if-start-re)
	   (save-match-data
	     (or (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
		 ;; Multi-line if-then.
		 (let (then-test)
		   (while
                     (and (= (forward-line 1) 0)
			    ;; Search forward for then.
			    (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
			    (not
			     (setq then-test
				   (looking-at
				    ".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
		   then-test)))))
	;; Sitting on one.
	(match-beginning 0)
      ;; Search for one.
      (save-excursion
	(let ((count 1))
	  (while (and (not (= count 0))
		      (not (eq (fortran-previous-statement) 'first-statement))
		      ;; Keep local to subprogram.
		      (not (and (looking-at fortran-end-prog-re)
				(fortran-check-end-prog-re))))
	    (skip-chars-forward " \t0-9")
	    (cond ((looking-at fortran-if-start-re)
		   (save-excursion
		     (if (or
			  (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
			  (let (then-test) ; Multi-line if-then.
			    (while
				(and
				 (= (forward-line 1) 0)
				 ;; Search forward for then.
				 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
				 (not
				  (setq then-test
					(looking-at
					 (concat ".*then\\b[ \t]*"
						 "[^ \t(=a-z0-9]"))))))
			    then-test))
			 (setq count (- count 1)))))
		  ((looking-at "end[ \t]*if\\b")
		   (setq count (+ count 1)))))
	  (and (= count 0)
	       ;; All pairs accounted for.
	       (point)))))))

(defun fortran-indent-line ()
  "Indent current Fortran line based on its contents and on previous lines."
  (interactive)
  (let ((cfi (fortran-calculate-indent)))
    (save-excursion
      (beginning-of-line)
      (if (or (not (= cfi (fortran-current-line-indentation)))
	      (and (re-search-forward "^[ \t]*[0-9]+" (+ (point) 4) t)
		   (not (fortran-line-number-indented-correctly-p))))
	  (fortran-indent-to-column cfi)
	(beginning-of-line)
	(if (and (not (looking-at fortran-comment-line-start-skip))
		 (fortran-find-comment-start-skip))
	    (fortran-indent-comment))))
    ;; Never leave point in left margin.
    (if (< (current-column) cfi)
	(move-to-column cfi))
    (if (and auto-fill-function
	     (> (save-excursion (end-of-line) (current-column))
		fill-column))
	(save-excursion
	  (end-of-line)
	  (fortran-fill)))
    (if fortran-blink-matching-if
        (progn
	  (fortran-blink-matching-if)
	  (fortran-blink-matching-do)))))

(defun fortran-auto-fill ()
  (if (> (current-column) (current-fill-column))
      (let ((cfi (fortran-calculate-indent)))
	(save-excursion
	  (beginning-of-line)
	  (if (or (not (= cfi (fortran-current-line-indentation)))
		  (and (re-search-forward "^[ \t]*[0-9]+"
					  (+ (point) 4) t)
		       (not (fortran-line-number-indented-correctly-p))))
	      (fortran-indent-to-column cfi)
	    (beginning-of-line)
	    (if (and (not (looking-at fortran-comment-line-start-skip))
		     (fortran-find-comment-start-skip))
		(fortran-indent-comment))))
	(fortran-fill)
	;; Never leave point in left margin.
	(if (< (current-column) cfi)
	    (move-to-column cfi)))))

;; Historically this was a separate function which advertised itself
;; as reindenting but only did so where `most likely to be necessary'.
(defalias 'fortran-indent-new-line 'reindent-then-newline-and-indent)

(defun fortran-indent-subprogram ()
  "Properly indent the Fortran subprogram which contains point."
  (interactive)
  (save-excursion
    (mark-defun)
    (message "Indenting subprogram...")
    (indent-region (point) (mark) nil))
  (message "Indenting subprogram...done."))

(defun fortran-calculate-indent ()
  "Calculates the Fortran indent column based on previous lines."
  (let (icol first-statement (case-fold-search t)
	     (fortran-minimum-statement-indent
	      (if indent-tabs-mode
		  fortran-minimum-statement-indent-tab
		fortran-minimum-statement-indent-fixed)))
    (save-excursion
      (setq first-statement (fortran-previous-statement))
      (if first-statement
	  (setq icol fortran-minimum-statement-indent)
	(progn
	  (if (= (point) (point-min))
	      (setq icol fortran-minimum-statement-indent)
	    (setq icol (fortran-current-line-indentation)))
	  (skip-chars-forward " \t0-9")
	  (cond ((looking-at "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?if[ \t]*(")
		 (if (or (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t_$(=a-z0-9]")
			 (let (then-test)	;multi-line if-then
			   (while (and (= (forward-line 1) 0)
				       ;;search forward for then
				       (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
				       (not (setq then-test
						  (looking-at
						   ".*then\\b[ \t]\
*[^ \t_$(=a-z0-9]")))))
			   then-test))
		     (setq icol (+ icol fortran-if-indent))))
		((looking-at "else\\(if\\)?\\b")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "select[ \t]*case[ \t](.*)")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "case[ \t]*(.*)")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "case[ \t]*default\\b")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "\\(otherwise\\|else[ \t]*where\\)\\b")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "where[ \t]*(.*)[ \t]*\n")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "do\\b")
		 (setq icol (+ icol fortran-do-indent)))
		((looking-at
		  "\\(structure\\|union\\|map\\|interface\\)\
\\b[ \t]*[^ \t=(a-z]")
		 (setq icol (+ icol fortran-structure-indent)))
		((and (looking-at fortran-end-prog-re1)
		      (fortran-check-end-prog-re))
		 ;; Previous END resets indent to minimum
		 (setq icol fortran-minimum-statement-indent))))))
    (save-excursion
      (beginning-of-line)
      (cond ((looking-at "[ \t]*$"))
	    ((looking-at fortran-comment-line-start-skip)
	     (cond ((eq fortran-comment-indent-style 'relative)
		    (setq icol (+ icol fortran-comment-line-extra-indent)))
		   ((eq fortran-comment-indent-style 'fixed)
		    (setq icol (+ fortran-minimum-statement-indent
				  fortran-comment-line-extra-indent))))
	     (setq fortran-minimum-statement-indent 0))
	    ((or (looking-at (concat "[ \t]*"
				     (regexp-quote
				      fortran-continuation-string)))
		 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
	     (setq icol (+ icol fortran-continuation-indent)))
	    ((looking-at "[ \t]*#")	; Check for cpp directive.
	     (setq fortran-minimum-statement-indent 0 icol 0))
	    (first-statement)
	    ((and fortran-check-all-num-for-matching-do
		  (looking-at "[ \t]*[0-9]+")
		  (fortran-check-for-matching-do))
	     (setq icol (- icol fortran-do-indent)))
	    (t
	     (skip-chars-forward " \t0-9")
	     (cond ((looking-at "end[ \t]*\\(if\\|select\\|where\\)\\b")
		    (setq icol (- icol fortran-if-indent)))
		   ((looking-at "else\\(if\\)?\\b")
		    (setq icol (- icol fortran-if-indent)))
                   ((looking-at "case[ \t]*\\((.*)\\|default\\>\\)")
		    (setq icol (- icol fortran-if-indent)))
		   ((looking-at "\\(otherwise\\|else[ \t]*where\\)\\b")
		    (setq icol (- icol fortran-if-indent)))
		   ((and (looking-at "continue\\b")
			 (fortran-check-for-matching-do))
		    (setq icol (- icol fortran-do-indent)))
		   ((looking-at "end[ \t]*do\\b")
		    (setq icol (- icol fortran-do-indent)))
		   ((looking-at "end[ \t]*\
\\(structure\\|union\\|map\\|interface\\)\\b[ \t]*[^ \t=(a-z]")
		    (setq icol (- icol fortran-structure-indent)))
		   ((and (looking-at fortran-end-prog-re1)
			 (fortran-check-end-prog-re)
			 (not (= icol fortran-minimum-statement-indent)))
 		    (message "Warning: `end' not in column %d.  Probably\
 an unclosed block." fortran-minimum-statement-indent))))))
    (max fortran-minimum-statement-indent icol)))

(defun fortran-current-line-indentation ()
  "Indentation of current line, ignoring Fortran line number or continuation.
This is the column position of the first non-whitespace character
aside from the line number and/or column 5/8 line-continuation character.
For comment lines, returns indentation of the first
non-indentation text within the comment."
  (save-excursion
    (beginning-of-line)
    (cond ((looking-at fortran-comment-line-start-skip)
	   (goto-char (match-end 0))
	   (skip-chars-forward
	    (if (stringp fortran-comment-indent-char)
		fortran-comment-indent-char
	      (char-to-string fortran-comment-indent-char))))
	  ((or (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
	   (goto-char (match-end 0)))
	  (t
	   ;; Move past line number.
	   (skip-chars-forward "[ \t0-9]")))
    ;; Move past whitespace.
    (skip-chars-forward " \t")
    (current-column)))

(defun fortran-indent-to-column (col)
  "Indent current line with spaces to column COL.
notes: 1) A non-zero/non-blank character in column 5 indicates a continuation
          line, and this continuation character is retained on indentation;
       2) If `fortran-continuation-string' is the first non-whitespace
          character, this is a continuation line;
       3) A non-continuation line which has a number as the first
          non-whitespace character is a numbered line.
       4) A TAB followed by a digit indicates a continuation line."
  (save-excursion
    (beginning-of-line)
    (if (looking-at fortran-comment-line-start-skip)
	(if fortran-comment-indent-style
	    (let* ((char (if (stringp fortran-comment-indent-char)
			     (aref fortran-comment-indent-char 0)
			   fortran-comment-indent-char))
		   (chars (string ?  ?\t char)))
	      (goto-char (match-end 0))
	      (skip-chars-backward chars)
	      (delete-region (point) (progn (skip-chars-forward chars)
					    (point)))
	      (insert-char char (- col (current-column)))))
      (if (looking-at "\t[1-9]")
	  (if indent-tabs-mode
	      (goto-char (match-end 0))
	    (delete-char 2)
	    (insert-char ?  5)
	    (insert fortran-continuation-string))
	(if (looking-at " \\{5\\}[^ 0\n]")
	    (if indent-tabs-mode
		(progn (delete-char 6)
		       (insert ?\t (fortran-numerical-continuation-char) 1))
	      (forward-char 6))
	  (delete-horizontal-space)
	  ;; Put line number in columns 0-4
	  ;; or put continuation character in column 5.
	  (cond ((eobp))
		((looking-at (regexp-quote fortran-continuation-string))
		 (if indent-tabs-mode
		     (progn
		       (indent-to
			(if indent-tabs-mode
			    fortran-minimum-statement-indent-tab
			  fortran-minimum-statement-indent-fixed))
		       (delete-char 1)
		       (insert-char (fortran-numerical-continuation-char) 1))
		   (indent-to 5)
		   (forward-char 1)))
		((looking-at "[0-9]+")
		 (let ((extra-space (- 5 (- (match-end 0) (point)))))
		   (if (< extra-space 0)
		       (message "Warning: line number exceeds 5-digit limit.")
		     (indent-to (min fortran-line-number-indent extra-space))))
		 (skip-chars-forward "0-9")))))
      ;; Point is now after any continuation character or line number.
      ;; Put body of statement where specified.
      (delete-horizontal-space)
      (indent-to col)
      ;; Indent any comment following code on the same line.
      (if (and comment-start-skip
	       (fortran-find-comment-start-skip))
	  (progn (goto-char (match-beginning 0))
		 (if (not (= (current-column)
			     (fortran-comment-indent)))
		     (progn (delete-horizontal-space)
			    (indent-to (fortran-comment-indent)))))))))

(defun fortran-line-number-indented-correctly-p ()
  "Return t if current line's line number is correctly indented.
Do not call if there is no line number."
  (save-excursion
    (beginning-of-line)
    (skip-chars-forward " \t")
    (and (<= (current-column) fortran-line-number-indent)
	 (or (= (current-column) fortran-line-number-indent)
	     (progn (skip-chars-forward "0-9")
		    (= (current-column) 5))))))

(defun fortran-check-for-matching-do ()
  "When called from a numbered statement, return t if matching DO is found.
Otherwise return nil."
  (let ((case-fold-search t)
	charnum)
    (save-excursion
      (beginning-of-line)
      (if (looking-at "[ \t]*[0-9]+")
	  (progn
	    (skip-chars-forward " \t")
	    (skip-chars-forward "0")	;skip past leading zeros
	    (setq charnum
		  (buffer-substring (point) (progn
					      (skip-chars-forward "0-9")
					      (point))))
	    (beginning-of-line)
	    (save-restriction
	      (save-excursion
		(narrow-to-defun)
		(and (re-search-backward
		      (concat
		       "\\(^[ \t0-9]*do[ \t]*0*"
		       charnum "\\b\\)\\|" "\\(^[ \t]*0*"
		       charnum "\\b\\)")
		      nil t)
		     (looking-at
		      (concat "^[ \t0-9]*do[ \t]*0*"
			      charnum))))))))))

(defun fortran-find-comment-start-skip ()
  "Move to past `comment-start-skip' found on current line.
Return t if `comment-start-skip' found, nil if not."
  ;; In order to move point only if comment-start-skip is found, this
  ;; one uses a lot of save-excursions.  Note that re-search-forward
  ;; moves point even if comment-start-skip is inside a string-constant.
  ;; Some code expects certain values for match-beginning and end.
  (interactive)
  (if (and comment-start-skip
	   (save-excursion
	     (re-search-forward comment-start-skip (line-end-position) t)))
      (let ((save-match-beginning (match-beginning 0))
	    (save-match-end (match-end 0)))
	(if (fortran-is-in-string-p (match-beginning 0))
	    (save-excursion
	      (goto-char save-match-end)
	      (fortran-find-comment-start-skip)) ; recurse for rest of line
	  (goto-char save-match-beginning)
	  (re-search-forward comment-start-skip (line-end-position) t)
	  (goto-char (match-end 0))
	  t))))

;;From: ralf@up3aud1.gwdg.de (Ralf Fassel)
;; Test if TAB format continuation lines work.
(defun fortran-is-in-string-p (where)
  "Return non-nil iff WHERE (a buffer position) is inside a Fortran string."
  (save-excursion
    (goto-char where)
    (cond
     ((bolp) nil)			; bol is never inside a string
     ((save-excursion			; comment lines too
	(beginning-of-line)
	(looking-at fortran-comment-line-start-skip)) nil)
     (t (let (;; ok, serious now. Init some local vars:
	      (parse-state '(0 nil nil nil nil nil 0))
	      (quoted-comment-start (if comment-start
					(regexp-quote comment-start)))
	      (not-done t)
	      parse-limit end-of-line)
	  ;; move to start of current statement
	  (fortran-next-statement)
	  (fortran-previous-statement)
	  ;; now parse up to WHERE
	  (while not-done
	    (if (or ;; skip to next line if:
		 ;; - comment line?
		 (looking-at fortran-comment-line-start-skip)
		 ;; - at end of line?
		 (eolp)
		 ;; - not in a string and after comment-start?
		 (and (not (nth 3 parse-state))
		      comment-start
		      (equal comment-start
			     (char-to-string (preceding-char)))))
		(if (> (forward-line) 0)
		    (setq not-done nil))
	      ;; else:
	      ;; if we are at beginning of code line, skip any
	      ;; whitespace, labels and tab continuation markers.
	      (if (bolp) (skip-chars-forward " \t0-9"))
	      ;; if we are in column <= 5 now, check for continuation char
	      (cond ((= 5 (current-column)) (forward-char 1))
		    ((and (< (current-column) 5)
			  (equal fortran-continuation-string
				 (char-to-string (following-char)))
			  (forward-char 1))))
	      ;; find out parse-limit from here
	      (setq end-of-line (line-end-position))
	      (setq parse-limit (min where end-of-line))
	      ;; parse max up to comment-start, if non-nil and in current line
	      (if comment-start
		  (save-excursion
		    (if (re-search-forward quoted-comment-start end-of-line t)
			(setq parse-limit (min (point) parse-limit)))))
	      ;; now parse if still in limits
	      (if (< (point) where)
		  (setq parse-state (parse-partial-sexp
				     (point) parse-limit nil nil parse-state))
		(setq not-done nil))))
	  ;; result is
	  (nth 3 parse-state))))))

;; From old version.
(defalias 'fortran-auto-fill-mode 'auto-fill-mode)

(defun fortran-fill ()
  (let* ((auto-fill-function #'fortran-auto-fill)
	 (opoint (point))
	 (bol (line-beginning-position))
	 (eol (line-end-position))
	 (bos (min eol (+ bol (fortran-current-line-indentation))))
	 (quote
	  (save-excursion
	    (goto-char bol)
	    (if (looking-at fortran-comment-line-start-skip)
		nil			; OK to break quotes on comment lines.
	      (move-to-column fill-column)
	      (if (fortran-is-in-string-p (point))
		  (save-excursion (re-search-backward "\\S\"\\s\"\\S\"" bol t)
				  (if fortran-break-before-delimiters
				      (point)
				    (1+ (point))))))))
	 ;; decide where to split the line. If a position for a quoted
	 ;; string was found above then use that, else break the line
	 ;; before the last delimiter.
	 ;; Delimiters are whitespace, commas, and operators.
	 ;; Will break before a pair of *'s.
	 (fill-point
	  (or quote
	      (save-excursion
		(move-to-column (1+ fill-column))
		(skip-chars-backward "^ \t\n,'+-/*=)"
;;;		 (if fortran-break-before-delimiters
;;;		     "^ \t\n,'+-/*=" "^ \t\n,'+-/*=)")
		 )
		(if (<= (point) (1+ bos))
		    (progn
		      (move-to-column (1+ fill-column))
		      ;;what is this doing???
		      (if (not (re-search-forward "[\t\n,'+-/*)=]" eol t))
			  (goto-char bol))))
		(if (bolp)
		    (re-search-forward "[ \t]" opoint t)
		  (backward-char)
		  (if (looking-at "\\s\"")
		      (forward-char)
		    (skip-chars-backward " \t\*")))
		(if fortran-break-before-delimiters
		    (point)
		  (1+ (point)))))))
    ;; if we are in an in-line comment, don't break unless the
    ;; line of code is longer than it should be. Otherwise
    ;; break the line at the column computed above.
    ;;
    ;; Need to use fortran-find-comment-start-skip to make sure that quoted !'s
    ;; don't prevent a break.
    (if (not (or (save-excursion
		   (if (and comment-start-skip
			    (re-search-backward comment-start-skip bol t)
			    (not (fortran-is-in-string-p (point))))
		       (progn
			 (skip-chars-backward " \t")
			 (< (current-column) (1+ fill-column)))))
		 (save-excursion
		   (goto-char fill-point)
		   (bolp))))
	(when (> (save-excursion
		   (goto-char opoint)
		   (current-column))
		 (min (1+ fill-column)
		      (+ (fortran-calculate-indent)
			 fortran-continuation-indent)))
	  (goto-char fill-point)
	  (fortran-break-line)
	  (end-of-line)))))

(defun fortran-break-line ()
  (let ((opoint (point))
	(bol (line-beginning-position))
	(eol (line-end-position))
	(comment-string nil))
    (save-excursion
      (if (and comment-start-skip (fortran-find-comment-start-skip))
	  (progn
	    (re-search-backward comment-start-skip bol t)
	    (setq comment-string (buffer-substring (point) eol))
	    (delete-region (point) eol))))
    ;; Forward line 1 really needs to go to next non white line
    (if (save-excursion (forward-line)
			(or (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")))
	(progn
	  (end-of-line)
	  (delete-region (point) (match-end 0))
	  (delete-horizontal-space)
	  (fortran-fill))
      (fortran-split-line))
    (if comment-string
	(save-excursion
	  (goto-char bol)
	  (end-of-line)
	  (delete-horizontal-space)
	  (indent-to (fortran-comment-indent))
	  (insert comment-string)))))

(defun fortran-analyze-file-format ()
  "Return nil if fixed format is used, t if TAB formatting is used.
Use `fortran-tab-mode-default' if no non-comment statements are found in the
file before the end or the first `fortran-analyze-depth' lines."
  (let ((i 0))
    (save-excursion
      (goto-char (point-min))
      (setq i 0)
      (while (not (or
		   (eobp)
		   (eq (char-after) ?\t)
		   (looking-at " \\{6\\}")
		   (> i fortran-analyze-depth)))
	(forward-line)
	(setq i (1+ i)))
      (cond
       ((eq (char-after) ?\t) t)
       ((looking-at " \\{6\\}") nil)
       (fortran-tab-mode-default t)
       (t nil)))))

(or (assq 'fortran-tab-mode-string minor-mode-alist)
    (setq minor-mode-alist (cons
			    '(fortran-tab-mode-string
			      (indent-tabs-mode fortran-tab-mode-string))
			    minor-mode-alist)))

(defun fortran-fill-paragraph (&optional justify)
  "Fill surrounding comment block as paragraphs, else fill statement.
Intended as the value of `fill-paragraph-function'."
  (interactive "P")
  (save-excursion
    (beginning-of-line)
    (if (not (looking-at fortran-comment-line-start-skip))
	(fortran-fill-statement)
	;; We're in a comment block.  Find the start and end of a
	;; paragraph, delimited either by non-comment lines or empty
	;; comments.  (Get positions as markers, since the
	;; `indent-region' below can shift the block's end).
	(let* ((non-empty-comment
		(concat fortran-comment-line-start-skip "[^ \t\n]"))
	       (start (save-excursion
			;; Find (start of) first line.
			(while (and (zerop (forward-line -1))
				    (looking-at non-empty-comment)))
			(or (looking-at non-empty-comment)
			    (forward-line)) ; overshot
			(point-marker)))
	       (end (save-excursion
		      ;; Find start of first line past region to fill.
		      (while (progn
			       (forward-line)
			       (looking-at non-empty-comment)))
		      (point-marker))))
	  ;; Indent the block, find the string comprising the effective
	  ;; comment start skip and use that as a fill-prefix for
	  ;; filling the region.
	  (indent-region start end nil)
	  (let ((paragraph-ignore-fill-prefix nil)
		(fill-prefix (progn
			       (beginning-of-line)
			       (looking-at fortran-comment-line-start-skip)
			       (match-string 0))))
	    (let (fill-paragraph-function)
	      (fill-region start end justify))) ; with normal `fill-paragraph'
	  (set-marker start nil)
	  (set-marker end nil))))
  t)

(defun fortran-fill-statement ()
  "Fill a fortran statement up to `fill-column'."
  (interactive)
  (let ((auto-fill-function #'fortran-auto-fill))
    (if (not (save-excursion
	       (beginning-of-line)
	       (or (looking-at "[ \t]*$")
		   (looking-at fortran-comment-line-start-skip)
		   (and comment-start-skip
			(looking-at (concat "[ \t]*"
					    comment-start-skip))))))
	(save-excursion
	  ;; Find beginning of statement.
	  (fortran-next-statement)
	  (fortran-previous-statement)
	  ;; Re-indent initially.
	  (fortran-indent-line)
	  ;; Replace newline plus continuation field plus indentation with
	  ;; single space.
	  (while (progn
		   (forward-line)
		   (fortran-remove-continuation)))
	  (fortran-previous-statement)))
    (fortran-indent-line)))

(defun fortran-strip-sqeuence-nos (&optional do-space)
  "Delete all text in column 72 and up (assumed to be sequence numbers).
Normally also deletes trailing whitespace after stripping such text.
Supplying prefix arg DO-SPACE prevents stripping the whitespace."
  (interactive "p")
  (save-excursion
    (goto-char (point-min))
    (while (re-search-forward "^.\\{72\\}\\(.*\\)" nil t)
      (replace-match "" nil nil nil 1)
      (unless do-space (delete-horizontal-space)))))

;; This code used to live in add-log.el, but this is a better place
;; for it.
(defun fortran-current-defun ()
  "Function to use for `add-log-current-defun-function' in Fortran mode."
  ;; We must be inside function body for this to work.
  (fortran-beginning-of-subprogram)
  (let ((case-fold-search t))		; case-insensitive
    ;; search for fortran subprogram start
    (if (re-search-forward
	 (concat "^[ \t]*\\(program\\|subroutine\\|function"
		 "\\|[ \ta-z0-9*()]*[ \t]+function\\|"
		 "\\(block[ \t]*data\\)\\)")
	 (save-excursion (fortran-end-of-subprogram)
			 (point))
	 t)
	(or (match-string-no-properties 2)
	    (progn
	      ;; move to EOL or before first left paren
	      (if (re-search-forward "[(\n]" nil t)
		  (progn (backward-char)
			 (skip-chars-backward " \t"))
		(end-of-line))
	      ;; Use the name preceding that.
	      (buffer-substring-no-properties (point) (progn (backward-sexp)
							     (point)))))
      "main")))

(provide 'fortran)

;;; fortran.el ends here