add new status command

This works for both direct and indirect mode.

It may need some performance tuning.

Note that unlike git status, it only shows the status of the work tree, not
the status of the index. So only one status letter, not two .. and since
files that have been added and not yet committed do not differ between the
work tree and the index, they are not shown. Might want to add display of
the index vs the last commit eventually.

This commit was sponsored by an unknown bitcoin contributor, whose
contribution as been going up lately! ;)

1 files changed, 14 insertions, 0 deletions

diff --git a/Git/Ref.hs b/Git/Ref.hs
index 5057180d1..6ce1b8784 100644
--- a/Git/Ref.hs
+++ b/Git/Ref.hs
@@ -41,6 +41,20 @@ under dir r = Ref $ dir ++ "/" ++
 underBase :: String -> Ref -> Ref
 underBase dir r = Ref $ dir ++ "/" ++ show (base r)
 
+{- A Ref that can be used to refer to a file in the repository, as staged
+ - in the index.
+ -
+ - Prefixing the file with ./ makes this work even if in a subdirectory
+ - of a repo.
+ -}
+fileRef :: FilePath -> Ref
+fileRef f = Ref $ ":./" ++ f
+
+{- A Ref that can be used to refer to a file in the repository as it
+ - appears in a given Ref. -}
+fileFromRef :: Ref -> FilePath -> Ref
+fileFromRef (Ref r) f = let (Ref fr) = fileRef f in Ref (r ++ fr)
+
 {- Checks if a ref exists. -}
 exists :: Ref -> Repo -> IO Bool
 exists ref = runBool