gnu: Add pup.

* gnu/packages/web.scm (pup): New variable.

Signed-off-by: 宋文武 <iyzsong@member.fsf.org>

gnu/packages/web.scm

@@ -47,6 +47,7 @@
 ;;; Copyright © 2020 Michael Rohleder <mike@rohleder.de>
 ;;; Copyright © 2020, 2021 Ryan Prior <rprior@protonmail.com>
 ;;; Copyright © 2020 Alexandru-Sergiu Marton <brown121407@posteo.ro>
+;;; Copyright © 2021 Stefan Reichör <stefan@xsteve.at>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -4869,6 +4870,33 @@ (define-public jq
 you'd expect.")
     (license (list license:expat license:cc-by3.0))))
 
+(define-public pup
+  (let ((revision "1")
+        (commit "681d7bb639334bf485476f5872c5bdab10931f9a"))
+    (package
+      (name "pup")
+      (version (git-version "0.4.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/ericchiang/pup")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "1hx1k0qlc1bq6gg5d4yprn4d7kvqzagg6mi5mvb39zdq6c4y17vr"))))
+      (build-system go-build-system)
+      (arguments
+       `(#:import-path "github.com/ericchiang/pup"))
+      (home-page "https://github.com/ericchiang/pup")
+      (synopsis "Parse HTML at the command line")
+      (description
+       "@command{pup} is a command line tool for processing HTML.  It reads
+from stdin, prints to stdout, and allows the user to filter parts of the page
+using CSS selectors.  Inspired by @command{jq}, @command{pup} aims to be a
+fast and flexible way of exploring HTML from the terminal.")
+      (license license:expat))))
+
 (define-public uhttpmock
   (package
     (name "uhttpmock")