cmdutil: Warn when trying to copy/rename --after to a nonexistant file.

Currently running 'hg rename --after foo.txt bar.typo' is a silent no-op.  This patch adds a warning.  It also updates the copy and rename tests.

No actual functionality is changed.

fixes issue 1822

mercurial/cmdutil.py

@@ -396,6 +396,12 b' def copy(ui, repo, pats, opts, rename=Fa'
 
         if after:
             if not exists:
+                if rename:
+                    ui.warn(_('%s: not recording move - %s does not exist\n') %
+                            (relsrc, reltarget))
+                else:
+                    ui.warn(_('%s: not recording copy - %s does not exist\n') %
+                            (relsrc, reltarget))
                 return
         elif not dryrun:
             try:

tests/test-copy2

@@ -19,6 +19,9 b' rm bar'
 hg st -A
 hg commit -m1
 
+echo "# copy --after to a nonexistant target filename"
+hg cp -A foo dummy
+
 echo "# dry-run; should show that foo is clean"
 hg copy --dry-run foo bar
 hg st -A

tests/test-copy2.out

@@ -11,6 +11,8 b' A bar'
 # should print a warning that this is not a real copy; foo is added
 bar has not been committed yet, so no copy data will be stored for foo.
 A foo
+# copy --after to a nonexistant target filename
+foo: not recording copy - dummy does not exist
 # dry-run; should show that foo is clean
 C foo
 # should show copy

tests/test-rename

@@ -23,6 +23,9 b' hg status -C'
 hg update -C
 rm d2/c
 
+echo "# rename --after a single file to a nonexistant target filename"
+hg rename --after d1/a dummy
+
 echo "# move a single file to an existing directory"
 hg rename d1/d11/a1 d2
 hg status -C

tests/test-rename.out

@@ -8,6 +8,8 b' A d2/c'
   d1/d11/a1
 R d1/d11/a1
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+# rename --after a single file to a nonexistant target filename
+d1/a: not recording move - dummy does not exist
 # move a single file to an existing directory
 A d2/a1
   d1/d11/a1
@@ -170,6 +172,8 b' R d1/d11/a1'
 4 files updated, 0 files merged, 0 files removed, 0 files unresolved
 # move --after some files under d1 to d2/d21 (glob)
 moving d1/a to d2/d21/a
+d1/b: not recording move - d2/d21/b does not exist
+d1/ba: not recording move - d2/d21/ba does not exist
 moving d1/d11/a1 to d2/d21/a1
 A d2/d21/a
   d1/a