2002-11-17 Michael Kifer <kifer@cs.stonybrook.edu>

 	* ediff-diff.el (ediff-setup-diff-regions): change regexp.

	* ediff-mult.el: comments.

	* ediff.el: comments.

3 files changed, 15 insertions, 12 deletions

diff --git a/lisp/ediff-diff.el b/lisp/ediff-diff.el
index f6c6a850329..37ac8c0e13d 100644
--- a/lisp/ediff-diff.el
+++ b/lisp/ediff-diff.el
@@ -225,7 +225,8 @@ one optional arguments, diff-number to refine.")
 ;; ediff-setup-diff-regions-function, which can also have the value
 ;; ediff-setup-diff-regions3, which takes 4 arguments.
 (defun ediff-setup-diff-regions (file-A file-B file-C)
-  (if (string-match "c" ediff-diff-options)
+  ;; looking either for '-c' or a 'c' in a set of clustered non-long options
+  (if (string-match "^-c\\| -c\\|-[^- ]+c" ediff-diff-options)
       (error "Option `-c' is not allowed in `ediff-diff-options'"))
                                                   
   ;; create, if it doesn't exist
diff --git a/lisp/ediff-mult.el b/lisp/ediff-mult.el
index 8e526c03659..a96450c9cf4 100644
--- a/lisp/ediff-mult.el
+++ b/lisp/ediff-mult.el
@@ -505,7 +505,8 @@ behavior."
 ;; DIR1, DIR2, DIR3 are directories.  DIR3 can be nil.
 ;; OUTPUT-DIR is a directory for auto-storing the results of merge jobs.
 ;;            Can be nil.
-;; REGEXP is a regexp used to filter out files in the directories.
+;; REGEXP is nil or a filter regexp; only file names that match the regexp
+;; are considered.
 ;; If a file is a directory in dir1 but not dir2 (or vice versa), it is not
 ;; included in the intersection.  However, a regular file that is a dir in dir3
 ;; is included, since dir3 files are supposed to be ancestors for merging.
diff --git a/lisp/ediff.el b/lisp/ediff.el
index 5b0f85d05cd..44eac2d7abd 100644
--- a/lisp/ediff.el
+++ b/lisp/ediff.el
@@ -497,8 +497,8 @@ If this file is a backup, `ediff' it with its original."
 ;;;###autoload
 (defun ediff-directories (dir1 dir2 regexp)
   "Run Ediff on a pair of directories, DIR1 and DIR2, comparing files that have
-the same name in both.  The third argument, REGEXP, is a regular expression
-that can be used to filter out certain file names."
+the same name in both.  The third argument, REGEXP, is nil or a regular
+expression; only file names that match the regexp are considered."
   (interactive
    (let ((dir-A (ediff-get-default-directory-name))
          f)
@@ -542,8 +542,9 @@ names.  Only the files that are under revision control are taken into account."
 ;;;###autoload
 (defun ediff-directories3 (dir1 dir2 dir3 regexp)
   "Run Ediff on three directories, DIR1, DIR2, and DIR3, comparing files that
-have the same name in all three.  The last argument, REGEXP, is a regular
-expression that can be used to filter out certain file names."
+have the same name in all three.  The last argument, REGEXP, is nil or a
+regular expression; only file names that match the regexp are considered."
+
   (interactive
    (let ((dir-A (ediff-get-default-directory-name))
          f)
@@ -571,8 +572,8 @@ expression that can be used to filter out certain file names."
 ;;;###autoload
 (defun ediff-merge-directories (dir1 dir2 regexp &optional merge-autostore-dir)
   "Run Ediff on a pair of directories, DIR1 and DIR2, merging files that have
-the same name in both.  The third argument, REGEXP, is a regular expression
-that can be used to filter out certain file names."
+the same name in both.  The third argument, REGEXP, is nil or a regular
+expression; only file names that match the regexp are considered."
   (interactive
    (let ((dir-A (ediff-get-default-directory-name))
          f)
@@ -600,8 +601,8 @@ that can be used to filter out certain file names."
   "Merge files in directories DIR1 and DIR2 using files in ANCESTOR-DIR as ancestors.
 Ediff merges files that have identical names in DIR1, DIR2.  If a pair of files
 in DIR1 and DIR2 doesn't have an ancestor in ANCESTOR-DIR, Ediff will merge
-without ancestor.  The fourth argument, REGEXP, is a regular expression that
-can be used to filter out certain file names."
+without ancestor.  The fourth argument, REGEXP, is nil or a regular expression;
+only file names that match the regexp are considered."
   (interactive
    (let ((dir-A (ediff-get-default-directory-name))
          f)
@@ -676,8 +677,8 @@ names.  Only the files that are under revision control are taken into account."
 
 ;; Run ediff-action (ediff-files, ediff-merge, ediff-merge-with-ancestors)
 ;; on a pair of directories (three directories, in case of ancestor).
-;; The third argument, REGEXP, is a regular expression that can be used to
-;; filter out certain file names.
+;; The third argument, REGEXP, is nil or a regular expression;
+;; only file names that match the regexp are considered.
 ;; JOBNAME is the symbol indicating the meta-job to be performed.
 ;; MERGE-AUTOSTORE-DIR is the directory in which to store merged files.
 (defun ediff-directories-internal (dir1 dir2 dir3 regexp action jobname