[bug#37886] [PATCH] gnu: Add ipcalc.

[Daniel Schäfer]

Hi,
here's my first patch to guix - please let me know whether everything's okay.
It adds the ipcalc package which can calculate IP ranges. Example:

$ /gnu/store/7jw45m8d1hcaihnr7978qqg1didl048a-ipcalc-0.41/bin/ipcalc 
192.168.0.1/24
Address:   192.168.0.1          11000000.10101000.00000000. 00000001
Netmask:   255.255.255.0 = 24   11111111.11111111.11111111. 00000000
Wildcard:  0.0.0.255            00000000.00000000.00000000. 11111111
=>
Network:   192.168.0.0/24       11000000.10101000.00000000. 00000000
HostMin:   192.168.0.1          11000000.10101000.00000000. 00000001
HostMax:   192.168.0.254        11000000.10101000.00000000. 11111110
Broadcast: 192.168.0.255        11000000.10101000.00000000. 11111111
Hosts/Net: 254                   Class C, Private Internet


* gnu/packages/ipcalc.scm (ipcalc): New file.
---
 gnu/packages/ipcalc.scm | 61 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 gnu/packages/ipcalc.scm

diff --git a/gnu/packages/ipcalc.scm b/gnu/packages/ipcalc.scm
new file mode 100644
index 0000000000..5f83389b25
--- /dev/null
+++ b/gnu/packages/ipcalc.scm
@@ -0,0 +1,61 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Daniel Schaefer <address@hidden>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages ipcalc)
+  #:use-module (gnu packages perl)
+  #:use-module (gnu packages)
+  #:use-module (guix download)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu))
+
+(define-public ipcalc
+  (package
+    (name "ipcalc")
+    (version "0.41")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://jodies.de/ipcalc-archive/";
+                                  name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "12if9sm8h2ac0pgwkw835cgyqjxm6h27k4kfn2vfas9krrqwbafx"))))
+    (inputs `(("perl" ,perl)))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:tests? #f  ; No test suite
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         (delete 'build)
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((out-bin (string-append
+                             (assoc-ref outputs "out")
+                             "/bin")))
+               (install-file "ipcalc" out-bin)
+               #t))))))
+    (synopsis "Simple IP network calculator")
+    (description "ipcalc takes an IP address and netmask and calculates the
+                 resulting broadcast, network, Cisco wildcard mask, and host
+                 range.  By giving a second netmask, you can design subnets and
+                 supernets.  It is also intended to be a teaching tool and
+                 presents the subnetting results as easy-to-understand binary
+                 values.")
+    (home-page "http://jodies.de/ipcalc";)
+    (license gpl2+)))
-- 
2.23.0