Added git checkout -f without args to githelp

Summary:
`githelp` supported `git checkout -f xyz` but not the same command with out a
path or a rev. Added support for it and wrote a test.

Test Plan:
Added tests and ran them.

Task: #7499727

Reviewers: ericsumner, durham

Reviewed By: durham

Subscribers: joesavona

Differential Revision: https://phabricator.fb.com/D2372309

Signature: t1:2372309:1440530832:cb32553b2ef7f7ff0e09cb80ff6449a8c26c2caf

githelp.py

@@ -262,7 +262,8 @@ def checkout(ui, repo, *args, **kwargs):
     cmd = Command('update')
 
     if opts.get('force'):
-        cmd['-C'] = None
+        if paths or rev:
+            cmd['-C'] = None
 
     if opts.get('patch'):
         cmd = Command('revert')
@@ -291,6 +292,9 @@ def checkout(ui, repo, *args, **kwargs):
             cmd['-r'] = rev
         else:
             cmd.append(rev)
+    elif opts.get('force'):
+        cmd = Command('revert')
+        cmd['--all'] = None
     else:
         raise GitUnknownError("a commit must be specified")
 

tests/test-githelp.t

@@ -145,6 +145,18 @@ githelp for checkout with the -p option
   
   hg revert -i -r xyz abc
 
+githelp for checkout with the -f option and a rev
+  $ hg githelp -- git checkout -f xyz
+  hg update -C xyz
+  $ hg githelp -- git checkout --force xyz
+  hg update -C xyz
+
+githelp for checkout with the -f option without an arg
+  $ hg githelp -- git checkout -f
+  hg revert --all
+  $ hg githelp -- git checkout --force
+  hg revert --all
+
 githelp for grep with pattern and path
   $ hg githelp -- grep shrubbery flib/intern/
   hg grep shrubbery flib/intern/