added github release helper to octotray and openraider

input/projects/3d-printing/octotray.md

 
 <span class="listdesc">[...back to 3D-Printing overview](3d-printing.html)</span>
 
+<!--%
+printLatestRelease("xythobuz", "OctoTray")
+%-->
+
 To quickly print new stuff on one of my printers, I am using the [OctoPrint](https://octoprint.org) integration of [PrusaSlicer](https://github.com/prusa3d/PrusaSlicer).
 Unfortunately, it does not allow me to turn on the printers power supply using the Raspberry Pi.
 But it is possible to do that via the [OctoPrint REST API](https://docs.octoprint.org/en/master/api/index.html).
 Because of that, I wrote a small tool to trigger the power of my printers that lives in the system tray.
-It runs on Linux using the Python Qt5 bindings, but without much work it should be able to run on other platforms with PyQt5 as well.
+It runs on Linux using the Python Qt5 bindings, but it has been tested on Windows and should run on macOS as well.
 
 <!--%
 lightgallery([

input/projects/openraider.md

 I also wanted to learn a bit about 3D graphics and OpenGL.
 Without planning it, I completely rewrote the whole project in a span of about two years.
 
+<!--%
+printLatestRelease("xythobuz", "OpenRaider")
+%-->
+
 I wrote some blog posts about OpenRaider.
 
 * [Initial blog post about fork](2014_03_22_openraider.html)

macros.py

     print '</div>'
 
 # -----------------------------------------------------------------------------
+# github helper macros
+# -----------------------------------------------------------------------------
+
+import urllib, json
+
+def restRequest(url):
+    response = urllib.urlopen(url)
+    data = json.loads(response.read())
+    return data
+
+def restReleases(user, repo):
+    s = "https://api.github.com/repos/"
+    s += user
+    s += "/"
+    s += repo
+    s += "/releases"
+    return restRequest(s)
+
+def printLatestRelease(user, repo):
+    repo_url = "https://github.com/" + user + "/" + repo
+    print("<div class=\"releasecard\">")
+    print("Release builds for " + repo + " are <a href=\"" + repo_url + "/releases\">available on GitHub</a>.<br>\n")
+
+    releases = restReleases(user, repo)
+    if len(releases) <= 0:
+        print("No release has been published on GitHub yet.")
+        print("</div>")
+        return
+
+    releases.sort(key=lambda x: x["published_at"], reverse=True)
+    r = releases[0]
+    release_url = r["html_url"]
+    print("Latest release of <a href=\"" + repo_url + "\">" + repo + "</a>, at the time of this writing: <a href=\"" + release_url + "\">" + r["name"] + "</a> (" + datetime.strptime(r["published_at"], "%Y-%m-%dT%H:%M:%SZ").strftime("%Y-%m-%d %H:%M:%S") + ")\n")
+
+    if len(r["assets"]) <= 0:
+        print("<br>No release assets have been published on GitHub for that.")
+        print("</div>")
+        return
+
+    print("<ul>")
+    print("Release Assets:")
+    for a in r["assets"]:
+        size = int(a["size"])
+        ss = " "
+        if size >= (1024 * 1024):
+            ss += "(%.1f MiB)" % (size / (1024.0 * 1024.0))
+        elif size >= 1024:
+            ss += "(%d KiB)" % (size // 1024)
+        else:
+            ss += "(%d Byte)" % (size)
+
+        print("<li><a href=\"" + a["browser_download_url"] + "\">" + a["name"] + "</a>" + ss)
+    print("</ul></div>")
+
+# -----------------------------------------------------------------------------
 # preconvert hooks
 # -----------------------------------------------------------------------------
 

static/css/style.css

     color: blue;
 }
 
+.releasecard {
+    border: 2px solid purple;
+    width: max-content;
+    padding: 0.6em 1em 0em 1em;
+    border-radius: 10px;
+    background-color: lightgray;
+    text-align: center;
+    margin: auto;
+}
+
 #home {
     font-size: 2.5em;
     margin-right: 0.5em;