build: prevent justhtml install < 3.10 python

The package says 3.10 or newer but does install on 3.8 (and maybe 3.9)
but the formatting is different (it's actually more like beautifulsoup
and dehtml output).

So rather than trying to fix the test when it shouldn't be installed
anyway just stop install if < 3.10.

Author: rouilj

.github/workflows/ci-test.yml

@@ -257,8 +257,11 @@ jobs:
         run: |
           set -xv
           pip install zstd || true
-          # justhtml supports python 3.10 or newer.
-          pip install justhtml || true
+          # justhtml supports python 3.10 or newer according to pypi
+          # page, but will install on 3.8 (and maybe 3.9) but formats
+          # differently. So skip install if before 3.10.
+          if echo $PYTHON_VERSION | grep '^3\...'; then
+              pip install justhtml || true; fi
           if [[ "$PYTHON_VERSION" != "2."* ]]; then 
               pip install Markdown; fi
 

CHANGES.txt

@@ -64,10 +64,11 @@ Features:
   config.ini. (John Rouillard)
 - issue2551152 - added basic PGP setup/use info to admin_guide. (John
   Rouillard)
-- add support for the 'justhtml' html 5 parser library. It is written
-  in pure Python. Used to convert html emails into plain text. Faster
-  then beautifulsoup4 and it passes the html 5 standard browser test
-  suite. Beautifulsoup is still supported. (John Rouillard)
+- add support for the 'justhtml' html 5 parser library for python >=
+  3.10. It is written in pure Python. Used to convert html emails into
+  plain text. Faster then beautifulsoup4 and it passes the html 5
+  standard browser test suite. Beautifulsoup is still supported. (John
+  Rouillard)
 
 2025-07-13 2.5.0
 

doc/installation.txt

@@ -317,7 +317,7 @@ beautifulsoup, justhtml
   email into plain text, beautifulsoup4_ or justhtml_ can also be
   used. You can choose the converter in the tracker's
   config. Note that justhtml is pure Python, fast and conforms to
-  HTML 5 standards.
+  HTML 5 standards but works only for Python 3.10 or newer.
 
 pywin32 - Windows Service
   You can run Roundup as a Windows service if pywin32_ is installed.