Find the tool's url in the package metadata.

README.md

@@ -27,7 +27,7 @@ e.g. After cloning do:
 
 Extensions | Tools
 ---------- | -----
-.py | python_syntax • python_unittests • pydoc • mypy • python_coverage • python_profile • pycodestyle • pyflakes • pylint • python_gut • python_modulefinder • python_mccabe • [bandit](http://wiki.openstack.org/wiki/Security/Project/Bandit)
+.py | python_syntax • python_unittests • pydoc • mypy • python_coverage • python_profile • pycodestyle • pyflakes • pylint • python_gut • python_modulefinder • python_mccabe • [bandit](https://wiki.openstack.org/wiki/Security/Projects/Bandit)
 .pyc | disassemble_pyc
 .pl .pm .t | perl_syntax • perldoc • perltidy
 .pod .pod6 | perldoc

make-readme.py

@@ -9,10 +9,9 @@ import tools
 
 
 def tool_markup(tool):
-    try:
-        return "[%s](%s)" % (tool.__name__, tool.url)
-    except AttributeError:
-        return tool.__name__
+    url = tools.url_of_tool(tool)
+    return (tool.__name__ if url is None else
+            "[%s](%s)" % (tool.__name__, url))
 
 
 print("""\

tools.py

@@ -460,7 +460,7 @@ def bandit(path):
     text_without_timestamp = "".join(text.splitlines(keepends=True)[2:])
     return status, fill3.Text(text_without_timestamp)
 bandit.dependencies = {"python-bandit", "python3-bandit"}
-bandit.url = "http://wiki.openstack.org/wiki/Security/Project/Bandit"
+bandit.url = "python3-bandit"
 
 
 def _perl_version(path):
@@ -819,3 +819,17 @@ def tool_name_colored(tool, path):
     char_style = (termstr.CharStyle(is_bold=True) if tool in _generic_tools()
                   else _charstyle_of_path(path))
     return termstr.TermStr(tool.__name__, char_style)
+
+
+@functools.lru_cache()
+def get_homepage_of_package(package):
+    line = subprocess.getoutput("dpkg-query --status %s | grep Homepage" % package)
+    return line.split()[1]
+
+
+def url_of_tool(tool):
+    try:
+        url = tool.url
+        return url if url.startswith("http") else get_homepage_of_package(url)
+    except AttributeError:
+        return None