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+;;; makefile-edit.el --- Makefile editing/scanning commands.
+
+;;; Copyright (C) 2009 Free Software Foundation, Inc.
+
+;; Author: Eric M. Ludlam <eric@siege-engine.com>
+
+;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Utilities for editing a Makefile for EDE Makefile management commands.
+;;
+;; Derived from project-am.el.
+;;
+;; Makefile editing and scanning commands
+;;
+;; Formatting of a makefile
+;;
+;; 1) Creating an automakefile, stick in a top level comment about
+;;    being created by emacs
+;; 2) Leave order of variable contents alone, except for SOURCE
+;;    SOURCE always keep in the order of .c, .h, the other stuff.
+
+;;; Things to do
+;; makefile-fill-paragraph -- refill a macro w/ backslashes
+;; makefile-insert-macro -- insert "foo = "
+
+
+;;; Code:
+
+(defun makefile-beginning-of-command ()
+  "Move the the beginning of the current command."
+  (interactive)
+  (if (save-excursion
+	(forward-line -1)
+	(makefile-line-continued-p))
+      (forward-line -1))
+  (beginning-of-line)
+  (if (not (makefile-line-continued-p))
+      nil
+    (while (and (makefile-line-continued-p)
+		(not (bobp)))
+      (forward-line -1))
+    (forward-line 1)))
+
+(defun makefile-end-of-command ()
+  "Move the the beginning of the current command."
+  (interactive)
+  (end-of-line)
+  (while (and (makefile-line-continued-p)
+	      (not (eobp)))
+    (forward-line 1)
+    (end-of-line)))
+
+(defun makefile-line-continued-p ()
+  "Return non-nil if the current line ends in continuation."
+  (save-excursion
+    (end-of-line)
+    (= (preceding-char) ?\\)))
+
+;;; Programatic editing of a Makefile
+;;
+(defun makefile-move-to-macro (macro &optional next)
+  "Move to the definition of MACRO.  Return t if found.
+If NEXT is non-nil, move to the next occurance of MACRO."
+  (let ((oldpt (point)))
+    (when (not next) (goto-char (point-min)))
+    (if (re-search-forward (concat "^\\s-*" macro "\\s-*[+:?]?=") nil t)
+	t
+      (goto-char oldpt)
+      nil)))
+
+(defun makefile-navigate-macro (stop-before)
+  "In a list of files, move forward until STOP-BEFORE is reached.
+STOP-BEFORE is a regular expression matching a file name."
+  (save-excursion
+    (makefile-beginning-of-command)
+    (let ((e (save-excursion
+	       (makefile-end-of-command)
+	       (point))))
+      (if (re-search-forward stop-before nil t)
+	  (goto-char (match-beginning 0))
+	(goto-char e)))))
+
+(defun makefile-macro-file-list (macro)
+  "Return a list of all files in MACRO."
+  (save-excursion
+    (goto-char (point-min))
+    (let ((lst nil))
+      (while (makefile-move-to-macro macro t)
+	(let ((e (save-excursion
+		   (makefile-end-of-command)
+		   (point))))
+	  (while (re-search-forward "\\s-**\\([-a-zA-Z0-9./_@$%(){}]+\\)\\s-*" e t)
+	    (let ((var nil)(varexp nil)
+		  (match (buffer-substring-no-properties
+			  (match-beginning 1)
+			  (match-end 1))))
+	      (if (not (setq var (makefile-extract-varname-from-text match)))
+		  (setq lst (cons match lst))
+		(setq varexp (makefile-macro-file-list var))
+		(dolist (V varexp)
+		  (setq lst (cons V lst))))))))
+      (nreverse lst))))
+
+(defun makefile-extract-varname-from-text (text)
+  "Extract the variable name from TEXT if it is a variable reference.
+Return nil if it isn't a variable."
+  (save-match-data
+    (when (string-match "\\$\\s(\\([A-Za-z0-9_]+\\)\\s)" text)
+      (match-string 1 text))))
+
+
+(provide 'ede/makefile-edit)
+
+;;; ede/makefile-edit.el ends here