tox: Use git directly to check for changes (docs).

We also remove checking for uncommited changes in misc_checks.py, as this
usually just is noise.

scripts/misc_checks.py

@@ -40,24 +40,17 @@ def check_git():
         print()
         return False
     untracked = []
-    changed = []
     gitst = subprocess.check_output(['git', 'status', '--porcelain'])
     gitst = gitst.decode('UTF-8').strip()
     for line in gitst.splitlines():
         s, name = line.split(maxsplit=1)
         if s == '??' and name != '.venv/':
             untracked.append(name)
-        elif s == 'M':
-            changed.append(name)
     status = True
     if untracked:
         status = False
         utils.print_col("Untracked files:", 'red')
         print('\n'.join(untracked))
-    if changed:
-        status = False
-        utils.print_col("Uncommited changes:", 'red')
-        print('\n'.join(changed))
     print()
     return status
 

tox.ini

@@ -90,10 +90,11 @@ commands =
 
 [testenv:docs]
 skip_install = true
+whitelist_externals = git
 deps =
     -rrequirements.txt
 commands =
     {[testenv:mkvenv]commands}
     {envpython} scripts/src2asciidoc.py
-    {envpython} scripts/misc_checks.py git
+    git --no-pager diff --exit-code --stat
     {envpython} scripts/asciidoc2html.py {posargs}