help: move rst formatting of help documents into help.py

This slight refactor will help me improve the 'unknown command'
experience in our new glorious pager future.

mercurial/commands.py

@@ -39,7 +39,6 b' from . import ('
     hg,
     lock as lockmod,
     merge as mergemod,
-    minirst,
     obsolete,
     patch,
     phases,
@@ -2721,10 +2720,6 b' def help_(ui, name=None, **opts):'
 
     Returns 0 if successful.
     """
-    textwidth = ui.configint('ui', 'textwidth', 78)
-    termwidth = ui.termwidth() - 2
-    if textwidth <= 0 or termwidth < textwidth:
-        textwidth = termwidth
 
     keep = opts.get('system') or []
     if len(keep) == 0:
@@ -2740,37 +2735,7 b' def help_(ui, name=None, **opts):'
     if ui.verbose:
         keep.append('verbose')
 
-    fullname = name
-    section = None
-    subtopic = None
-    if name and '.' in name:
-        name, remaining = name.split('.', 1)
-        remaining = encoding.lower(remaining)
-        if '.' in remaining:
-            subtopic, section = remaining.split('.', 1)
-        else:
-            if name in help.subtopics:
-                subtopic = remaining
-            else:
-                section = remaining
-
-    text = help.help_(ui, name, subtopic=subtopic, **opts)
-
-    formatted, pruned = minirst.format(text, textwidth, keep=keep,
-                                       section=section)
-
-    # We could have been given a weird ".foo" section without a name
-    # to look for, or we could have simply failed to found "foo.bar"
-    # because bar isn't a section of foo
-    if section and not (formatted and name):
-        raise error.Abort(_("help section not found: %s") % fullname)
-
-    if 'verbose' in pruned:
-        keep.append('omitted')
-    else:
-        keep.append('notomitted')
-    formatted, pruned = minirst.format(text, textwidth, keep=keep,
-                                       section=section)
+    formatted = help.formattedhelp(ui, name, keep=keep, **opts)
     ui.pager('help')
     ui.write(formatted)
 

mercurial/help.py

@@ -605,3 +605,47 b' def help_(ui, name, unknowncmd=False, fu'
         rst.extend(helplist(None, **opts))
 
     return ''.join(rst)
+
+def formattedhelp(ui, name, keep=None, unknowncmd=False, full=True, **opts):
+    """get help for a given topic (as a dotted name) as rendered rst
+
+    Either returns the rendered help text or raises an exception.
+    """
+    if keep is None:
+        keep = []
+    fullname = name
+    section = None
+    subtopic = None
+    if name and '.' in name:
+        name, remaining = name.split('.', 1)
+        remaining = encoding.lower(remaining)
+        if '.' in remaining:
+            subtopic, section = remaining.split('.', 1)
+        else:
+            if name in subtopics:
+                subtopic = remaining
+            else:
+                section = remaining
+    textwidth = ui.configint('ui', 'textwidth', 78)
+    termwidth = ui.termwidth() - 2
+    if textwidth <= 0 or termwidth < textwidth:
+        textwidth = termwidth
+    text = help_(ui, name,
+                 subtopic=subtopic, unknowncmd=unknowncmd, full=full, **opts)
+
+    formatted, pruned = minirst.format(text, textwidth, keep=keep,
+                                       section=section)
+
+    # We could have been given a weird ".foo" section without a name
+    # to look for, or we could have simply failed to found "foo.bar"
+    # because bar isn't a section of foo
+    if section and not (formatted and name):
+        raise error.Abort(_("help section not found: %s") % fullname)
+
+    if 'verbose' in pruned:
+        keep.append('omitted')
+    else:
+        keep.append('notomitted')
+    formatted, pruned = minirst.format(text, textwidth, keep=keep,
+                                       section=section)
+    return formatted