% Copyright (C) 2002-2005 David Roundy % % This program is free software; you can redistribute it and/or modify % it under the terms of the GNU General Public License as published by % the Free Software Foundation; either version 2, or (at your option) % any later version. % % This program is distributed in the hope that it will be useful, % but WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the % GNU General Public License for more details. % % You should have received a copy of the GNU General Public License % along with this program; see the file COPYING. If not, write to % the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, % Boston, MA 02110-1301, USA. \begin{code}
{-# OPTIONS_GHC -cpp -fno-warn-orphans -fglasgow-exts #-}

module Darcs.Patch.Show ( showPatch_, showNamedPrefix )

import Prelude hiding ( pi )

import Printer ( Doc, renderString, vcat,
                 text, blueText,
                 ($$), (<+>) )
import Darcs.Patch.Core ( Patch(..) )
import Darcs.Patch.Prim ( showPrim, FileNameFormat(..) )
import Darcs.Patch.Info ( PatchInfo, showPatchInfo )
import Darcs.Witnesses.Ordered ( FL(NilFL), mapFL )
import Darcs.Witnesses.Show ( Show2(..), ShowDict(..) )
#include "gadts.h"
\end{code} \section{Patch string formatting} Of course, in order to store our patches in a file, we'll have to save them as some sort of strings. The convention is that each patch string will end with a newline, but on parsing we skip any amount of whitespace between patches. \begin{code}
instance Show (Patch C(x y))  where
    show p = renderString (showPatch_ p) ++ "\n"
instance Show2 Patch where
    showDict2 = ShowDictClass

showPatch_ :: Patch C(a b) -> Doc
showPatch_ (PP p) = showPrim OldFormat p
showPatch_ (ComP NilFL) = blueText "{" $$ blueText "}"
showPatch_ (ComP ps)  = blueText "{"
                        $$ vcat (mapFL showPatch_ ps)
                        $$ blueText "}"
showPatch_ (Merger _ _ p1 p2) = showMerger "merger" p1 p2
showPatch_ (Regrem _ _ p1 p2) = showMerger "regrem" p1 p2
\end{code} \paragraph{Merger patches} Merge two patches. The MERGERVERSION is included to allow some degree of backwards compatibility if the merger algorithm needs to be changed. \begin{verbatim} merger MERGERVERSION \end{verbatim} \begin{code}
showMerger :: String -> Patch C(a b) -> Patch C(d e) -> Doc
showMerger merger_name p1 p2 =
    blueText merger_name <+> text "0.0" <+> blueText "("
                           $$ showPatch_ p1
                           $$ showPatch_ p2
                           $$ blueText ")"
\end{code} \paragraph{Named patches} Named patches are displayed as a ``patch id'' which is in square brackets, followed by a patch. Optionally, after the patch id (but before the patch itself) can come a list of dependencies surrounded by angle brackets. Each dependency consists of a patch id. \begin{code}
showNamedPrefix :: PatchInfo -> [PatchInfo] -> Doc
showNamedPrefix n d = showPatchInfo n
                   $$ blueText "<"
                   $$ vcat (map showPatchInfo d)
                   $$ blueText ">"