gnu: Add cl-eazy-gnuplot.

* gnu/packages/lisp-xyz.scm (sbcl-eazy-gnuplot, cl-eazy-gnuplot,
  ecl-eazy-gnuplot): New variables.
* gnu/packages/patches/sbcl-eazy-gnuplot-skip-path-check.patch:
  New file.
* gnu/local.mk (dist_patch_DATA): Register it.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

gnu/local.mk

@@ -1834,6 +1834,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/sbcl-aserve-fix-rfe12668.patch	\
   %D%/packages/patches/sbcl-burgled-batteries3-fix-signals.patch	\
   %D%/packages/patches/sbcl-clml-fix-types.patch		\
+  %D%/packages/patches/sbcl-eazy-gnuplot-skip-path-check.patch	\
   %D%/packages/patches/sbcl-png-fix-sbcl-compatibility.patch	\
   %D%/packages/patches/scalapack-gcc-10-compilation.patch	\
   %D%/packages/patches/scheme48-tests.patch			\

gnu/packages/lisp-xyz.scm

@@ -10068,6 +10068,53 @@ visualization.")
 (define-public cl-ana
   (sbcl-package->cl-source-package sbcl-cl-ana))
 
+(define-public sbcl-eazy-gnuplot
+  (let ((commit "2eb900fe2557e6c066a9851c166e572c25bc0996")
+        (revision "0"))
+    (package
+      (name "sbcl-eazy-gnuplot")
+      (version (git-version "0.2.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/guicho271828/eazy-gnuplot")
+               (commit commit)))
+         (file-name (git-file-name "cl-eazy-gnuplot" version))
+         (sha256
+          (base32 "0mpkx1z52riahydzvqv7kk15p0pv2k7k5a7j65fg571kcxmssx8s"))
+         (patches (search-patches "sbcl-eazy-gnuplot-skip-path-check.patch"))))
+      (build-system asdf-build-system/sbcl)
+      (native-inputs
+       (list sbcl-fiveam))
+      (inputs
+       (list gnuplot
+             sbcl-alexandria
+             sbcl-iterate
+             sbcl-trivia))
+      (arguments
+       `(#:phases
+         (modify-phases %standard-phases
+           (add-after 'unpack 'fix-paths
+             (lambda _
+               (substitute* "src/package.lisp"
+                 (("\"gnuplot\"")
+                  (string-append "\"" (which "gnuplot") "\""))))))))
+      (home-page "https://github.com/guicho271828/eazy-gnuplot")
+      (synopsis "Common Lisp interface to gnuplot")
+      (description
+       "Eazy-Gnuplot is a Common Lisp interface to gnuplot which eschews CFFI,
+CLOS and structures.  It communicates with @command{gnuplot} via
+@code{*standard-output*}, and users can plot data by printing to that
+stream.")
+      (license license:llgpl))))
+
+(define-public cl-eazy-gnuplot
+  (sbcl-package->cl-source-package sbcl-eazy-gnuplot))
+
+(define-public ecl-eazy-gnuplot
+  (sbcl-package->ecl-package sbcl-eazy-gnuplot))
+
 (define-public sbcl-archive
   (let ((commit "631271c091ed02994bec3980cb288a2cf32c7cdc")
         (revision "1"))

gnu/packages/patches/sbcl-eazy-gnuplot-skip-path-check.patch

@@ -0,0 +1,14 @@
+Don't check whether gnuplot is present in $PATH, because we know it is.
+
+diff --git a/eazy-gnuplot.asd b/eazy-gnuplot.asd
+index 7b1c09b..4657cd6 100644
+--- a/eazy-gnuplot.asd
++++ b/eazy-gnuplot.asd
+@@ -37,7 +37,4 @@
+                                :fill-pointer t)))
+           (setf (fill-pointer seq) (read-sequence seq stream))
+           seq)))
+-  :perform (load-op :before (op c)
+-                    (unless (zerop (nth-value 2 (uiop:run-program "which gnuplot" :ignore-error-status t)))
+-                      (warn "Could not find GNUPLOT in $PATH")))
+   :in-order-to ((test-op (test-op eazy-gnuplot.test))))