bookmarks: simplify iscurrent to isactivewdirparent (API)

Previously this function accepted two optional parameters that were unused by
any callers and complicated the function.

Today, the terms 'active' and 'current' are interchangeably used throughout the
codebase in reference to the active bookmark (the bookmark that will be updated
with the next commit). This leads to confusion among developers and users.
This patch is part of a series to standardize the usage to 'active' throughout
the mercurial codebase and user interface.

mercurial/bookmarks.py

@@ -165,17 +165,18 b' def deactivate(repo):'
     finally:
         wlock.release()
 
-def iscurrent(repo, mark=None, parents=None):
-    '''Tell whether the current bookmark is also active
+def isactivewdirparent(repo):
+    """
+    Tell whether the 'active' bookmark (the one that follows new commits)
+    points to one of the parents of the current working directory (wdir).
 
-    I.e., the bookmark listed in .hg/bookmarks.current also points to a
-    parent of the working directory.
-    '''
-    if not mark:
-        mark = repo._activebookmark
-    if not parents:
-        parents = [p.node() for p in repo[None].parents()]
+    While this is normally the case, it can on occasion be false; for example,
+    immediately after a pull, the active bookmark can be moved to point
+    to a place different than the wdir. This is solved by running `hg update`.
+    """
+    mark = repo._activebookmark
     marks = repo._bookmarks
+    parents = [p.node() for p in repo[None].parents()]
     return (mark in marks and marks[mark] in parents)
 
 def deletedivergent(repo, deletefrom, bm):
@@ -201,7 +202,7 b' def calculateupdate(ui, repo, checkout):'
     movemarkfrom = None
     if checkout is None:
         curmark = repo._activebookmark
-        if iscurrent(repo):
+        if isactivewdirparent(repo):
             movemarkfrom = repo['.'].node()
         elif curmark:
             ui.status(_("updating to active bookmark %s\n") % curmark)

mercurial/cmdutil.py

@@ -2721,7 +2721,7 b' def buildcommittext(repo, ctx, subs, ext'
         edittext.append(_("HG: branch merge"))
     if ctx.branch():
         edittext.append(_("HG: branch '%s'") % ctx.branch())
-    if bookmarks.iscurrent(repo):
+    if bookmarks.isactivewdirparent(repo):
         edittext.append(_("HG: bookmark '%s'") % repo._activebookmark)
     edittext.extend([_("HG: subrepo %s") % s for s in subs])
     edittext.extend([_("HG: added %s") % f for f in added])

mercurial/templatekw.py

@@ -226,7 +226,7 b' def showcurrentbookmark(**args):'
     associated with the changeset"""
     import bookmarks as bookmarks # to avoid circular import issues
     repo = args['repo']
-    if bookmarks.iscurrent(repo):
+    if bookmarks.isactivewdirparent(repo):
         current = repo._activebookmark
         if current in args['ctx'].bookmarks():
             return current