Add flag for recursive builds.

TODO

@@ -1,10 +1,6 @@
-* Remove the combineValue hack for VItem.
-  Probably needs a different item type for free-text?
-  Or make x-* fields be lists?
-
 * Install data files, include files, etc.
   Add include dirs from installed packages to uses of it.
 
-* Add flag to build recursively.
-
 * Test (with ghc) with lots of packages.
+
+* Cache compiler name&version

src/MicroCabal/Backend/GHC.hs

@@ -47,8 +47,7 @@ initDB env = do
   dir <- getGhcDir env
   b <- doesDirectoryExist dir
   when (not b) $ do
-    when (verbose env > 0) $
-      putStrLn $ "Creating GHC package db " ++ dir
+    message env 0 $ "Creating GHC package db " ++ dir
     cmd env $ "ghc-pkg init " ++ dir
 
 ghcExists :: Env -> PackageName -> IO Bool
@@ -98,8 +97,7 @@ ghcBuildExe env _ (Section _ name flds) = do
   stdArgs <- setupStdArgs env flds
   let args    = unwords $ ["-O"] ++ stdArgs ++ ["-o", bin, "--make", mainIs'] ++
                 [ ">/dev/null" | verbose env <= 0 ]
-  when (verbose env >= 0) $
-    putStrLn $ "Build executable " ++ bin ++ " with ghc"
+  message env 0 $ "Building executable " ++ bin ++ " with ghc"
   cmd env $ "ghc " ++ args
 
 findMainIs :: Env -> [FilePath] -> FilePath -> IO FilePath
@@ -131,8 +129,7 @@ ghcBuildLib env (Section _ _ glob) (Section _ name flds) = do
                        (omdls ++ mdls) ++
                        [ ">/dev/null" | verbose env <= 0 ]
       key = name ++ "-" ++ showVersion ver ++ "-mcabal"
-  when (verbose env >= 0) $
-    putStrLn $ "Build library " ++ name ++ " with ghc"
+  message env 0 $ "Building library " ++ name ++ " with ghc"
   cmd env $ "ghc " ++ args
 
 ghcInstallExe :: Env -> Section -> Section -> IO ()
@@ -191,5 +188,6 @@ ghcInstallLib env (Section _ _ glob) (Section _ name flds) = do
         ]
       key = namever ++ "-mcabal"
       pkgFn = db </> key ++ ".conf"
+      quiet = if verbose env > 0 then "" else " >/dev/null"
   writeFile pkgFn desc
-  cmd env $ "ghc-pkg update --package-db=" ++ db ++ " " ++ pkgFn
+  cmd env $ "ghc-pkg update --package-db=" ++ db ++ " " ++ pkgFn ++ quiet

src/MicroCabal/Env.hs

@@ -12,6 +12,7 @@ data Env = Env {
   distDir  :: FilePath,           -- where to build, default is dist-mcabal
   verbose  :: Int,                -- how chatty, default is 0, -1=say nothing, 0=minimal messages, 1=debug info
   depth    :: Int,                -- nesting depth for recursive builds, default is 0
+  recursive:: Bool,               -- do recursive builds, default is False
   backend  :: Backend             -- which compiler to use, default is MHS
   }
 
@@ -25,5 +26,5 @@ data Backend = Backend {
   }
 
 message :: Env -> Int -> String -> IO ()
-message env level msg | verbose env >= level = putStrLn msg
+message env level msg | verbose env >= level = putStrLn $ replicate (2 * depth env) ' ' ++ msg
                       | otherwise = return ()

src/MicroCabal/Main.hs

@@ -41,12 +41,13 @@ setupEnv :: IO Env
 setupEnv = do
   home <- getEnv "HOME"
   let cdir = home </> ".mcabal"
-  return Env{ cabalDir = cdir, distDir = "dist-mcabal", verbose = 0, depth = 0, backend = mhsBackend }
+  return Env{ cabalDir = cdir, distDir = "dist-mcabal", verbose = 0, depth = 0, backend = mhsBackend, recursive = False }
 
 decodeCommonArgs :: Env -> IO (Env, [String])
 decodeCommonArgs env = do
   let loop e ("-v"    : as) = loop e{ verbose = verbose e + 1 } as
       loop e ("-q"    : as) = loop e{ verbose = -1 } as
+      loop e ("-r"    : as) = loop e{ recursive = True } as
       loop e ("--ghc" : as) = loop e{ backend = ghcBackend } as
       loop e ("--mhs" : as) = loop e{ backend = mhsBackend } as
       loop e as = return (e, as)
@@ -200,6 +201,7 @@ findCabalFile _env = do
 cmdBuild :: Env -> [String] -> IO ()
 cmdBuild env [] = build env
 cmdBuild env [pkg] = do
+  message env 0 $ "Build package " ++ pkg
   st <- getPackageInfo env pkg
   let dir = dirForPackage env st
   b <- doesDirectoryExist dir
@@ -241,7 +243,7 @@ build env = do
 
 buildExe :: Env -> Section -> Section -> IO ()
 buildExe env glob sect@(Section _ name flds) = do
-  putStrLn $ "Building executable " ++ name
+  message env 0 $ "Building executable " ++ name
   createPathFile env sect
   let deps = getBuildDepends flds
       pkgs = [ p | (p, _, _) <- deps ]
@@ -250,7 +252,7 @@ buildExe env glob sect@(Section _ name flds) = do
 
 buildLib :: Env -> Section -> Section -> IO ()
 buildLib env glob sect@(Section _ name flds) = do
-  putStrLn $ "Building library " ++ name
+  message env 0 $ "Building library " ++ name
   createPathFile env sect
   let pkgs = getBuildDependsPkg flds
   mapM_ (checkDep env) pkgs
@@ -261,7 +263,12 @@ checkDep env pkg = do
   let bend = backend env
   b <- doesPkgExist bend env pkg
   when (not b) $
-    error $ "dependency not installed: " ++ pkg
+    if recursive env then do
+      let env' = env { depth = depth env + 1 }
+      preserveCurrentDirectory $
+        cmdInstall env' [pkg]
+    else
+      error $ "dependency not installed: " ++ pkg
 
 -----------------------------------------
 
@@ -287,13 +294,13 @@ install env = do
 
 installExe :: Env -> Section -> Section -> IO ()
 installExe env glob sect@(Section _ name _) = do
-  putStrLn $ "Installing executable " ++ name
+  message env 0 $ "Installing executable " ++ name
   installDataFiles env glob sect
   installPkgExe (backend env) env glob sect
 
 installLib :: Env -> Section -> Section -> IO ()
 installLib env glob sect@(Section _ name _) = do
-  putStrLn $ "Installing library " ++ name
+  message env 0 $ "Installing library " ++ name
   installDataFiles env glob sect
   installPkgLib (backend env) env glob sect
 
@@ -318,6 +325,7 @@ cmdHelp _ _ = putStrLn "\
   \Flags:\n\
   \  -v                            be more verbose (can be repeated)\n\
   \  -q                            be quiet\n\
+  \  -r                            do recursive installs for missing packages\n\
   \  --ghc                         compile using ghc\n\
   \  --mhs                         compile using mhs (default)\n\
   \\n\

src/MicroCabal/Unix.hs

@@ -6,6 +6,7 @@ module MicroCabal.Unix(
   rmrf,
   cp,
   copyFiles,
+  preserveCurrentDirectory,
   (</>),
   ) where
 import Control.Exception
@@ -88,6 +89,13 @@ copyFiles :: Env -> FilePath -> [FilePath] -> FilePath -> IO ()
 copyFiles env src fns tgt = do
   cmd env $ "cd " ++ src ++ "; tar cf - " ++ unwords fns ++ " | (cd " ++ tgt ++ "; tar xf - )"
 
+preserveCurrentDirectory :: IO a -> IO a
+preserveCurrentDirectory io = do
+  cwd <- getCurrentDirectory
+  a <- io
+  setCurrentDirectory cwd
+  return a
+
 -----
 
 (</>) :: FilePath -> FilePath -> FilePath