Make hg add foo; hg mv foo bar work.

- foo will be removed (the user has a copy of its contents in bar)

- bar will not be marked as a copy (there was no committed version of foo).
  We print a warning telling that to the user.

Fixes issue269.

mercurial/commands.py

@@ -466,18 +466,17 b' def docopy(ui, repo, pats, opts, wlock):'
     # return: hgsep
     def okaytocopy(abs, rel, exact):
         reasons = {'?': _('is not managed'),
-                   'a': _('has been marked for add'),
                    'r': _('has been marked for remove')}
         state = repo.dirstate.state(abs)
         reason = reasons.get(state)
         if reason:
+            if exact:
+                ui.warn(_('%s: not copying - file %s\n') % (rel, reason))
+        else:
             if state == 'a':
                 origsrc = repo.dirstate.copied(abs)
                 if origsrc is not None:
                     return origsrc
-            if exact:
-                ui.warn(_('%s: not copying - file %s\n') % (rel, reason))
-        else:
             return abs
 
     # origsrc: hgsep
@@ -532,8 +531,15 b' def docopy(ui, repo, pats, opts, wlock):'
         if ui.verbose or not exact:
             ui.status(_('copying %s to %s\n') % (relsrc, reltarget))
         targets[abstarget] = abssrc
-        if abstarget != origsrc and not opts.get('dry_run'):
-            repo.copy(origsrc, abstarget, wlock)
+        if abstarget != origsrc:
+            if repo.dirstate.state(origsrc) == 'a':
+                ui.warn(_("%s was marked for addition. "
+                          "%s will not be committed as a copy.\n")
+                        % (repo.pathto(origsrc, cwd), reltarget))
+                if abstarget not in repo.dirstate and not opts.get('dry_run'):
+                    repo.add([abstarget], wlock)
+            elif not opts.get('dry_run'):
+                repo.copy(origsrc, abstarget, wlock)
         copied.append((abssrc, relsrc, exact))
 
     # pat: ossep

tests/test-copy2

@@ -2,9 +2,26 b''
 
 hg init
 echo foo > foo
+echo "# should fail - foo is not managed"
+hg mv foo bar
+hg st -A
 hg add foo
+echo "# dry-run; print a warning that this is not a real copy; foo is added"
+hg mv --dry-run foo bar
+hg st -A
+echo "# should print a warning that this is not a real copy; bar is added"
+hg mv foo bar
+hg st -A
+echo "# should print a warning that this is not a real copy; foo is added"
+hg cp bar foo
+hg rm -f bar
+rm bar
+hg st -A
 hg commit -m1 -d"0 0"
 
+echo "# dry-run; should show that foo is clean"
+hg copy --dry-run foo bar
+hg st -A
 echo "# should show copy"
 hg copy foo bar
 hg st -C

tests/test-copy2.out

@@ -1,3 +1,18 b''
+# should fail - foo is not managed
+foo: not copying - file is not managed
+abort: no files to copy
+? foo
+# dry-run; print a warning that this is not a real copy; foo is added
+foo was marked for addition. bar will not be committed as a copy.
+A foo
+# should print a warning that this is not a real copy; bar is added
+foo was marked for addition. bar will not be committed as a copy.
+A bar
+# should print a warning that this is not a real copy; foo is added
+bar was marked for addition. foo will not be committed as a copy.
+A foo
+# dry-run; should show that foo is clean
+C foo
 # should show copy
 A bar
   foo