Add support for "gzipped" files.

diff --git a/v7/src/edwin/unix.scm b/v7/src/edwin/unix.scm
index dd998c40f8e0de6ed90adf2c3db304a342519e70..91a1a7f3bdef940a86bfdb1a6c4867844b2667b5 100644 (file)
--- a/v7/src/edwin/unix.scm
+++ b/v7/src/edwin/unix.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;    $Id: unix.scm,v 1.34 1993/02/25 08:52:14 gjr Exp $
+;;;    $Id: unix.scm,v 1.35 1993/04/15 09:47:26 cph Exp $
 ;;;
 ;;;    Copyright (c) 1989-1993 Massachusetts Institute of Technology
 ;;;
@@ -302,7 +302,7 @@ Includes the new backup.  Must be > 0."
          filename))))
 \f
 (define unix/encoding-pathname-types
-  '("Z"))
+  '("Z" "z"))
 
 (define unix/backup-suffixes
   (cons "~"
@@ -390,29 +390,35 @@ Includes the new backup.  Must be > 0."
 
 (define-variable enable-compressed-files
   "If true, compressed files are automatically uncompressed when read,
-and recompressed when written.  A compressed file is identified by the
-filename suffix \".Z\"."
+and recompressed when written.  A compressed file is identified by one
+of the filename suffixes \".z\" or \".Z\"."
   true
   boolean?)
 
 (define (maybe-read-compressed-file pathname mark visit?)
   visit?
   (and (ref-variable enable-compressed-files mark)
-       (equal? "Z" (pathname-type pathname))
-       (begin
-        (read-compressed-file pathname mark)
-        true)))
-
-(define (read-compressed-file pathname mark)
+       (let ((type (pathname-type pathname)))
+        (cond ((equal? "z" type)
+               (read-compressed-file "gunzip" pathname mark)
+               #t)
+              ((equal? "Z" type)
+               (read-compressed-file "uncompress" pathname mark)
+               #t)
+              (else
+               #f)))))
+
+(define (read-compressed-file program pathname mark)
   (if (not (equal? '(EXITED . 0)
                   (shell-command false
                                  mark
                                  (directory-pathname pathname)
                                  false
-                                 (string-append "uncompress < "
+                                 (string-append program
+                                                " < "
                                                 (file-namestring pathname)))))
       (error:file-operation pathname
-                           "uncompress"
+                           program
                            "file"
                            "[unknown]"
                            read-compressed-file
@@ -421,21 +427,27 @@ filename suffix \".Z\"."
 (define (maybe-write-compressed-file region pathname visit?)
   visit?
   (and (ref-variable enable-compressed-files (region-start region))
-       (equal? "Z" (pathname-type pathname))
-       (begin
-        (write-compressed-file region pathname)
-        true)))
-
-(define (write-compressed-file region pathname)
+       (let ((type (pathname-type pathname)))
+        (cond ((equal? "z" type)
+               (write-compressed-file "gzip" region pathname)
+               #t)
+              ((equal? "Z" type)
+               (write-compressed-file "compress" region pathname)
+               #t)
+              (else
+               #f)))))
+
+(define (write-compressed-file program region pathname)
   (if (not (equal? '(EXITED . 0)
                   (shell-command region
                                  false
                                  (directory-pathname pathname)
                                  false
-                                 (string-append "compress > "
+                                 (string-append program
+                                                " > "
                                                 (file-namestring pathname)))))
       (error:file-operation pathname
-                           "compress"
+                           program
                            "file"
                            "[unknown]"
                            write-compressed-file