gnu: nyx: Show header stats.

This is a follow-up to commit 18ab54d4a2
and fixes a regression introduced by Nyx 2.0.4 + Python 3.

* gnu/packages/tor.scm (nyx)[source]: Add patch.
* gnu/packages/patches/nyx-show-header-stats-with-python3.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -960,6 +960,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/nvi-assume-preserve-path.patch		\
   %D%/packages/patches/nvi-dbpagesize-binpower.patch		\
   %D%/packages/patches/nvi-db4.patch				\
+  %D%/packages/patches/nyx-show-header-stats-with-python3.patch	\
   %D%/packages/patches/ocaml-bisect-fix-camlp4-in-another-directory.patch	\
   %D%/packages/patches/ocaml-bitstring-fix-configure.patch \
   %D%/packages/patches/ocaml-CVE-2015-8869.patch		\

gnu/packages/patches/nyx-show-header-stats-with-python3.patch

@@ -0,0 +1,70 @@
+From: Tobias Geerinckx-Rice <me@tobias.gr>
+Date: Fri, 22 Jun 2018 02:56:39 +0200
+Subject: nyx: Show header stats.
+
+The following patch was taken verbatim from the upstream repository and
+will be included in the next release.
+---
+commit 3494111cc81ad4985e81d0c1ea5e451d8f7a2bcc
+Author: Damian Johnson <atagar@torproject.org>
+Date:   Mon Feb 5 20:07:40 2018 -0800
+
+    Header stats missing with python3
+    
+    Ick! took me a while to find this. Python3 changed division from providing ints
+    to floats. This in turn caused our header panel to call addstr with float x/y
+    coordinates, which made that funciton fail silently. End result is that when
+    the header panel showed two columns of stats the right column was missing.
+    
+    Caught thanks to Stijn.
+
+diff --git a/nyx/panel/header.py b/nyx/panel/header.py
+index 09e3838..fb6f2f7 100644
+--- a/nyx/panel/header.py
++++ b/nyx/panel/header.py
+@@ -155,7 +155,7 @@ class HeaderPanel(nyx.panel.DaemonPanel):
+     # space available for content
+ 
+     interface = nyx_interface()
+-    left_width = max(subwindow.width / 2, 77) if is_wide else subwindow.width
++    left_width = max(subwindow.width // 2, 77) if is_wide else subwindow.width
+     right_width = subwindow.width - left_width
+ 
+     _draw_platform_section(subwindow, 0, 0, left_width, vals)
+diff --git a/web/changelog/index.html b/web/changelog/index.html
+index 333fa84..196d82b 100644
+--- a/web/changelog/index.html
++++ b/web/changelog/index.html
+@@ -74,6 +74,12 @@
+           </ul>
+         </li>
+ 
++        <li><span class="component">Header</span>
++          <ul>
++            <li>Right column of stats missing when using python 3.x</li>
++          </ul>
++        </li>
++
+         <li><span class="component">Connections</span>
+           <ul>
+             <li>Geoip information unavailable for inbound connections</li>
+diff --git a/web/changelog/legacy.html b/web/changelog/legacy.html
+index a380806..02d405f 100644
+--- a/web/changelog/legacy.html
++++ b/web/changelog/legacy.html
+@@ -137,13 +137,13 @@
+           </ul>
+         </li>
+ 
+-        <li><span class="component">Startup</span>
++        <li><span class="component">Graph</span>
+           <ul>
+             <li>Crash when pausing if we showed accounting stats</li>
+           </ul>
+         </li>
+ 
+-        <li><span class="component">Startup</span>
++        <li><span class="component">Logging</span>
+           <ul>
+             <li>Skip reading from malformed tor log files</li>
+             <li>Unable to log GUARD events</li>

gnu/packages/tor.scm

@@ -263,6 +263,8 @@ (define-public nyx
      (origin
        (method url-fetch)
        (uri (pypi-uri name version))
+       (patches
+        (search-patches "nyx-show-header-stats-with-python3.patch"))
        (sha256
         (base32
          "0pm7vfcqr02pzqz4b2f6sw5prxxmgqwr1912am42xmy2i53n7nrq"))))