gnu: Rename escpr to epson-inkjet-printer-escpr.

‘escpr’ is nice and short, but everyone else calls this package
‘epson-inkjet-printer-escpr’.  More importantly, so does upstream.

* gnu/packages/cups.scm (escpr, epson-inkjet-printer-escpr,): Rename
escpr to epson-inkjet-printer-escpr, redefining escpr as
deprecated-package.  Adjust all users.

doc/guix.texi

@@ -17503,16 +17503,17 @@ CUPS service will generate a self-signed certificate if needed, for
 secure connections to the print server.
 
 Suppose you want to enable the Web interface of CUPS and also add
-support for Epson printers @i{via} the @code{escpr} package and for HP
+support for Epson printers @i{via} the @code{epson-inkjet-printer-escpr}
-printers @i{via} the @code{hplip-minimal} package.  You can do that directly,
+package and for HP printers @i{via} the @code{hplip-minimal} package.
-like this (you need to use the @code{(gnu packages cups)} module):
+You can do that directly, like this (you need to use the
+@code{(gnu packages cups)} module):
 
 @lisp
 (service cups-service-type
          (cups-configuration
            (web-interface? #t)
            (extensions
-             (list cups-filters escpr hplip-minimal))))
+             (list cups-filters epson-inkjet-printer-escpr hplip-minimal))))
 @end lisp
 
 Note: If you wish to use the Qt5 based GUI which comes with the hplip
@@ -17541,7 +17542,7 @@ Available @code{cups-configuration} fields are:
 The CUPS package.
 @end deftypevr
 
-@deftypevr {@code{cups-configuration} parameter} package-list extensions (default: @code{(list escpr hplip-minimal foomatic-filters)})
+@deftypevr {@code{cups-configuration} parameter} package-list extensions (default: @code{(list epson-inkjet-printer-escpr hplip-minimal foomatic-filters)})
 Drivers and other extensions to the CUPS package.
 @end deftypevr
 

gnu/packages/cups.scm

@@ -744,9 +744,9 @@ HP@tie{}LaserJet, and possibly other printers.  See @file{README} for details.")
     (license (list license:expat        ; icc2ps/*.[ch]
                    license:gpl2+))))    ; everything else
 
-(define-public escpr
+(define-public epson-inkjet-printer-escpr
   (package
-    (name "escpr")
+    (name "epson-inkjet-printer-escpr")
     (version "1.7.8")
     ;; XXX: This currently works.  But it will break as soon as a newer
     ;; version is available since the URLs for older versions are not
@@ -806,6 +806,9 @@ language.")
     (home-page "http://download.ebz.epson.net/dsc/search/01/search/?OSC=LX")
     (license license:gpl2+)))
 
+(define-public escpr
+  (deprecated-package "escpr" epson-inkjet-printer-escpr))
+
 (define-public splix
   ;; Last released in 2009 <https://sourceforge.net/projects/splix/files/>.
   ;; Last SVN commit was 2013 <https://svn.code.sf.net/p/splix/code/splix/>.

gnu/services/cups.scm

@@ -482,7 +482,8 @@ programs.")
    (package cups)
    "The CUPS package.")
   (extensions
-   (package-list (list cups-filters escpr hplip-minimal foomatic-filters))
+   (package-list (list cups-filters epson-inkjet-printer-escpr
+                       foomatic-filters hplip-minimal))
    "Drivers and other extensions to the CUPS package.")
   (files-configuration
    (files-configuration (files-configuration))