1 files changed, 96 insertions, 0 deletions

diff --git a/Setup.hs b/Setup.hs
new file mode 100644
index 00000000..d07decd4
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,96 @@
+import Control.Monad
+import Data.List
+import Distribution.Simple
+import Distribution.Simple.LocalBuildInfo
+import Distribution.Simple.Setup
+import Distribution.Simple.Utils
+import System.Directory
+
+main = defaultMainWithHooks hooks
+
+hooks :: UserHooks
+hooks = simpleUserHooks
+    { buildHook = \pkgDesc localBuildInfo hooks flags -> do
+        let paths = (absoluteInstallDirs pkgDesc localBuildInfo dest)
+                {- libsubdir = "<undef>"
+                , datasubdir = "<undef>"
+                -}
+            dest = maybe NoCopyDest CopyTo $
+                   flagToMaybe $ buildDistPref flags
+        buildSystemDConfig localBuildInfo paths
+        buildHook simpleUserHooks pkgDesc localBuildInfo hooks flags
+    , copyHook = \pkgDesc localBuildInfo hooks flags -> do
+        let paths = (absoluteInstallDirs pkgDesc localBuildInfo (fromFlag $ copyDest flags))
+                {- libsubdir = "<undef>"
+                , datasubdir = "<undef>"
+                -}
+            dest = maybe NoCopyDest CopyTo $
+                   flagToMaybe $ copyDistPref flags
+        copySystemDConfig localBuildInfo paths flags
+        copyHook simpleUserHooks pkgDesc localBuildInfo hooks flags
+    }
+
+-- Drop a /-terminated prefix from a Filepath.  The / is not dropped.
+dropPrefix :: String -> FilePath -> FilePath
+dropPrefix prefix s | prefix `isPrefixOf` s = drop (length prefix - 1) s
+                    | otherwise             = s
+
+exestart :: FilePath -> InstallDirs FilePath -> String -> String
+exestart buildprefix paths cmd
+    | "ExecStart=" `isPrefixOf` cmd  = "ExecStart="++(dropPrefix buildprefix $ bindir paths) ++ "/presence"
+    | otherwise                      = cmd
+
+buildSystemDConfig :: LocalBuildInfo -> InstallDirs FilePath -> IO ()
+buildSystemDConfig buildInfo paths = do
+    template <- lines <$> readFile "presence.service"
+    let buildprefix = takeWhile (/='/') (buildDir buildInfo) ++ "/"
+        service = map (exestart buildprefix paths) template
+    createDirectoryIfMissing True (buildDir buildInfo)
+    writeFile (buildDir buildInfo ++ "/presence.service") $ unlines service
+
+preferredSystemDPath prefix =
+    case removeSlashes prefix of
+        ""    -> "/lib/systemd/system"
+        "usr" -> "/lib/systemd/system"
+        _     -> "/etc/systemd/system"
+
+removeSlashes prefix = reverse $ dropWhile (=='/') $ reverse $ dropWhile (=='/') prefix
+
+-- InstallDirs {prefix = "dest/usr/local"
+-- , bindir = "dest/usr/local/bin"
+-- , libdir = "dest/usr/local/lib/x86_64-linux-ghc-8.0.2/presence-0.0.1-1fqjx0Frxyf1ESoA9cNUiZ"
+-- , libsubdir = "<undef>"
+-- , dynlibdir = "dest/usr/local/lib/x86_64-linux-ghc-8.0.2"
+-- , libexecdir = "dest/usr/local/libexec"
+-- , includedir = "dest/usr/local/lib/x86_64-linux-ghc-8.0.2/presence-0.0.1-1fqjx0Frxyf1ESoA9cNUiZ/include"
+-- , datadir = "dest/usr/local/share/x86_64-linux-ghc-8.0.2/presence-0.0.1"
+-- , datasubdir = "<undef>"
+-- , docdir = "dest/usr/local/share/doc/x86_64-linux-ghc-8.0.2/presence-0.0.1"
+-- , mandir = "dest/usr/local/share/man"
+-- , htmldir = "dest/usr/local/share/doc/x86_64-linux-ghc-8.0.2/presence-0.0.1/html"
+-- , haddockdir = "dest/usr/local/share/doc/x86_64-linux-ghc-8.0.2/presence-0.0.1/html"
+-- , sysconfdir = "dest/usr/local/etc"}
+-- CopyFlags
+-- { copyDest = Flag (CopyTo "dest/")
+-- , copyDistPref = Flag "dist"
+-- , copyVerbosity = Flag Verbose}
+-- realprefix = dest/usr/local
+
+copySystemDConfig :: LocalBuildInfo -> InstallDirs FilePath -> CopyFlags -> IO ()
+copySystemDConfig buildInfo paths flags = do
+    -- print paths
+    -- print flags
+    let verbosity  = fromFlag (copyVerbosity flags)
+        built      = buildDir buildInfo ++ "/presence.service"
+        realprefix = dropPrefix dest (prefix paths)
+        dest       = case fromFlag (copyDest flags) of
+                        NoCopyDest -> ""
+                        CopyTo p   -> p
+        sysddir    = dest ++ drop 1 (preferredSystemDPath realprefix)
+        sysdpath   = sysddir ++ "/presence.service"
+    -- putStrLn $ "realprefix = " ++ realprefix
+    -- putStrLn $ "no slashes = " ++ removeSlashes realprefix
+    -- putStrLn $ "sysdpath   = " ++ sysdpath
+    createDirectoryIfMissing True sysddir
+    installOrdinaryFile verbosity built sysdpath
+