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module GF.Command.CommandInfo where
import GF.Command.Abstract(Option,Expr,Term)
import GF.Text.Pretty(render)
import GF.Grammar.Printer() -- instance Pretty Term
import GF.Grammar.Macros(string2term)
import qualified PGF as H(showExpr)
import qualified PGF.Internal as H(Literal(LStr),Expr(ELit)) ----
data CommandInfo m = CommandInfo {
exec :: [Option] -> CommandArguments -> m CommandOutput,
synopsis :: String,
syntax :: String,
explanation :: String,
longname :: String,
options :: [(String,String)],
flags :: [(String,String)],
examples :: [(String,String)],
needsTypeCheck :: Bool
}
mapCommandExec f c = c { exec = \ opts ts -> f (exec c opts ts) }
--emptyCommandInfo :: CommandInfo env
emptyCommandInfo = CommandInfo {
exec = error "command not implemented",
synopsis = "",
syntax = "",
explanation = "",
longname = "",
options = [],
flags = [],
examples = [],
needsTypeCheck = True
}
--------------------------------------------------------------------------------
class Monad m => TypeCheckArg m where typeCheckArg :: Expr -> m Expr
--------------------------------------------------------------------------------
data CommandArguments = Exprs [Expr] | Strings [String] | Term Term
newtype CommandOutput = Piped (CommandArguments,String) ---- errors, etc
-- ** Converting command output
fromStrings ss = Piped (Strings ss, unlines ss)
fromExprs es = Piped (Exprs es,unlines (map (H.showExpr []) es))
fromString s = Piped (Strings [s], s)
pipeWithMessage es msg = Piped (Exprs es,msg)
pipeMessage msg = Piped (Exprs [],msg)
pipeExprs es = Piped (Exprs es,[]) -- only used in emptyCommandInfo
void = Piped (Exprs [],"")
stringAsExpr = H.ELit . H.LStr -- should be a pattern macro
-- ** Converting command input
toStrings args =
case args of
Strings ss -> ss
Exprs es -> zipWith showAsString (True:repeat False) es
Term t -> [render t]
where
showAsString first t =
case t of
H.ELit (H.LStr s) -> s
_ -> ['\n'|not first] ++
H.showExpr [] t ---newline needed in other cases than the first
toExprs args =
case args of
Exprs es -> es
Strings ss -> map stringAsExpr ss
Term t -> [stringAsExpr (render t)]
toTerm args =
case args of
Term t -> t
Strings ss -> string2term $ unwords ss -- hmm
Exprs es -> string2term $ unwords $ map (H.showExpr []) es -- hmm
-- ** Creating documentation
mkEx s = let (command,expl) = break (=="--") (words s) in (unwords command, unwords (drop 1 expl))
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