From: Mark Wooding <mdw@distorted.org.uk>
Date: Wed, 1 Jun 2011 21:34:41 +0000 (+0100)
Subject: Merge branch 'master' of metalzone:public-git/lisp
X-Git-Url: https://git.distorted.org.uk/~mdw/lisp/commitdiff_plain/b73ffb8235ffb6f3bce6ac42731e19d3be846067?hp=d977f44b3dbc17d099431c53d053005262769c6b

Merge branch 'master' of metalzone:public-git/lisp

* 'master' of metalzone:public-git/lisp:
  safely.lisp: Fixes for later SBCL.
  safely.lisp: More CLisp fixing.
  safely.lisp: Hacking for CLisp support.
  str: Handy functions for testing prefixes/suffixes.
  safely: Fix useless use of APPLY in SAFELY-WRITING.
---

diff --git a/safely.lisp b/safely.lisp
index b5d7ff8..84a06c4 100644
--- a/safely.lisp
+++ b/safely.lisp
@@ -33,7 +33,13 @@
 #+(or cmu sbcl)
 (eval-when (:compile-toplevel :execute)
   (import #+cmu '(ext:unix-namestring unix:unix-link)
-	  #+sbcl '(sb-int:unix-namestring)))
+	  #+sbcl '(sb-ext:native-namestring)))
+#+cmu
+(progn
+  (declaim (inline unix-namestring))
+  (defun native-namestring (pathname &key as-file)
+    (declare (ignore as-file))
+    (unix-namestring pathname nil)))
 
 (defstruct (safely (:predicate safelyp))
   "Stores information about how to commit or undo safe writes."
@@ -104,6 +110,11 @@
 	  (safely-trail safe))
     stream))
 
+(declaim (inline rename))
+(defun rename (old new)
+  #-clisp (rename-file old new)
+  #+clisp (posix:copy-file old new :method :rename))
+
 (defun delete-file-without-moaning (file)
   "Delete the FILE, ignoring errors."
   (handler-case (delete-file file)
@@ -112,7 +123,7 @@
 (defun rename-file-without-moaning (old new)
   "Rename OLD to NEW, ignoring errors, and without doing any stupid name
    mangling."
-  (handler-case (rename-file old new)
+  (handler-case (rename old new)
     (file-error () nil)))
 
 (defun safely-unwind (trail)
@@ -153,11 +164,23 @@
   ;; Use link(2) where available.
   (generate-fresh-file-name file tag
 			    (lambda (name)
-			      (let ((from (unix-namestring file t))
-				    (to (unix-namestring name nil)))
+			      (let ((from (native-namestring file
+							     :as-file t))
+				    (to (native-namestring name
+							   :as-file t)))
 				(and from to
 				     (unix-link from to)))))
 
+  #+clisp
+  (generate-fresh-file-name file tag
+			    (lambda (name)
+			      (posix:copy-file (namestring file)
+					       (namestring name)
+					       :method :hardlink
+					       :if-exists nil)))
+
+
+
   #-(or cmu sbcl)
   ;; Otherwise just copy the file contents and hope for the best.
   (with-open-file (input file :element-type :default)
@@ -207,7 +230,7 @@
 				  (push `(:rmtmp ,old) cleanup)
 				  (push `(:revert ,old ,file) revert))
 				(push `(:rmtmp ,file) revert))
-			    (rename-file new file)))
+			    (rename new file)))
 		  (:delete (destructuring-bind (tag file) job
 			     (declare (ignore tag))
 			     (let ((old (safe-copy file "delete")))
@@ -237,8 +260,7 @@
    temporary file, and if BODY completes, it is renamed to FILE."
   (with-gensyms safe
     `(safely (,safe)
-       (let ((,stream (apply #'safely-open-output-stream
-			     ,safe ,file ,open-args)))
+       (let ((,stream (safely-open-output-stream ,safe ,file ,@open-args)))
 	 ,@body))))
 
 ;;;----- That's all, folks --------------------------------------------------
diff --git a/str.lisp b/str.lisp
index 94a58a4..5cf05aa 100644
--- a/str.lisp
+++ b/str.lisp
@@ -25,7 +25,8 @@
 
 (defpackage #:mdw.str
   (:use #:common-lisp #:mdw.base)
-  (:export #:join-strings #:str-next-word #:str-split-words))
+  (:export #:join-strings #:str-next-word #:str-split-words
+	   #:str-beginsp #:str-endsp))
 (in-package #:mdw.str)
 
 (defun join-strings (del strs)
@@ -134,4 +135,30 @@
 	 (incf n)))
     (nreverse l)))
 
+(declaim (inline str-beginsp))
+(defun str-beginsp (string prefix &key (start1 0) end1 (start2 0) end2)
+  "Returns true if STRING (or the appropriate substring of it) begins with
+   PREFIX."
+  (setf-default end1 (length string)
+		end2 (length prefix))
+  (let ((strlen (- end1 start1))
+	(prelen (- end2 start2)))
+    (and (>= strlen prelen)
+	 (string= string prefix
+		  :start1 start1 :end1 (+ start1 prelen)
+		  :start2 start2 :end2 end2))))
+
+(declaim (inline str-endsp))
+(defun str-endsp (string suffix &key (start1 0) end1 (start2 0) end2)
+  "Returns true if STRING (or the appropriate substring of it) ends with
+   SUFFIX."
+  (setf-default end1 (length string)
+		end2 (length suffix))
+  (let ((strlen (- end1 start1))
+	(suflen (- end2 start2)))
+    (and (>= strlen suflen)
+	 (string= string suffix
+		  :start1 (- end1 suflen) :end1 end1
+		  :start2 start2 :end2 end2))))
+
 ;;;----- That's all, folks --------------------------------------------------