* pcvs-util.el (cvs-strings->string, cvs-string->strings): Rename

and move to...

* subr.el (strings->string, string->strings): ...here.

diff --git a/lisp/subr.el b/lisp/subr.el
index 7ce7071f2f7992efcabaa0b56f30b39b7e0cada8..86616265c59ceaa5ba97fe065b74293f93a84d98 100644 (file)
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2768,6 +2768,36 @@ Modifies the match data; use `save-match-data' if necessary."
              (cons (substring string start)
                    list)))
     (nreverse list)))
+
+;; (string->strings (strings->string X)) == X
+(defun strings->string (strings &optional separator)
+  "Concatenate the STRINGS, adding the SEPARATOR (default \" \").
+This tries to quote the strings to avoid ambiguity such that
+  (string->strings (strings->string strs)) == strs
+Only some SEPARATORs will work properly."
+  (let ((sep (or separator " ")))
+    (mapconcat
+     (lambda (str)
+       (if (string-match "[\\\"]" str)
+          (concat "\"" (replace-regexp-in-string "[\\\"]" "\\\\\\&" str) "\"")
+        str))
+     strings sep)))
+
+;; (string->strings (strings->string X)) == X
+(defun string->strings (string &optional separator)
+  "Split the STRING into a list of strings.
+It understands elisp style quoting within STRING such that
+  (string->strings (strings->string strs)) == strs
+The SEPARATOR regexp defaults to \"\\s-+\"."
+  (let ((sep (or separator "\\s-+"))
+       (i (string-match "[\"]" string)))
+    (if (null i) (split-string string sep t)   ; no quoting:  easy
+      (append (unless (eq i 0) (split-string (substring string 0 i) sep t))
+             (let ((rfs (read-from-string string i)))
+               (cons (car rfs)
+                     (string->strings (substring string (cdr rfs))
+                                          sep)))))))
+
 \f
 ;;;; Replacement in strings.