help: create packages for the help text

These files need to be loaded as resources with PyOxidizer, instead of using
filesystem representations.  AFAICT, the resource loading mechanisms only work
for the named package given to it, and can't reach into a subdirectory.

While here, the `help` directory is renamed to `helptext`.  Without this, trying
to load external help text crashed in mercurial/help.py when importing `.i18n`,
saying there's no `mercurial.help.i18n` module.

Differential Revision: https://phab.mercurial-scm.org/D7376

mercurial/help.py

@@ -311,7 +311,7 b' def loaddoc(topic, subdir=None):'
     """Return a delayed loader for help/topic.txt."""
 
     def loader(ui):
-        docdir = os.path.join(util.datapath, b'help')
+        docdir = os.path.join(util.datapath, b'helptext')
         if subdir:
             docdir = os.path.join(docdir, subdir)
         path = os.path.join(docdir, topic + b".txt")

setup.py

@@ -1191,6 +1191,8 b' packages = ['
     'mercurial',
     'mercurial.cext',
     'mercurial.cffi',
+    'mercurial.helptext',
+    'mercurial.helptext.internals',
     'mercurial.hgweb',
     'mercurial.interfaces',
     'mercurial.pure',
@@ -1535,11 +1537,11 b" if os.name == 'nt':"
 packagedata = {
     'mercurial': [
         'locale/*/LC_MESSAGES/hg.mo',
-        'help/*.txt',
-        'help/internals/*.txt',
         'default.d/*.rc',
         'dummycert.pem',
-    ]
+    ],
+    'mercurial.helptext': ['*.txt',],
+    'mercurial.helptext.internals': ['*.txt',],
 }
 
 

tests/test-check-config.t

@@ -24,7 +24,7 b' Sanity check check-config.py'
   > EOF
 
   $ cat > files << EOF
-  > mercurial/help/config.txt
+  > mercurial/helptext/config.txt
   > $TESTTMP/testfile.py
   > EOF