Merge pull request #456 from haskell-CI/implicit-config

Read cabal.haskell-ci by default

.github/workflows/haskell-ci.yml

@@ -1,14 +1,14 @@
 # This GitHub workflow config has been generated by a script via
 #
-#   haskell-ci '--config=cabal.haskell-ci' 'github' 'cabal.project'
+#   haskell-ci 'github' 'cabal.project'
 #
 # To regenerate the script (for example after adjusting tested-with) run
 #
 #   haskell-ci regenerate
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# REGENDATA ["--config=cabal.haskell-ci","github","cabal.project"]
+# REGENDATA ["github","cabal.project"]
 #
 name: Haskell-CI
 on:

haskell-ci.cabal

@@ -1,6 +1,6 @@
 cabal-version:      2.2
 name:               haskell-ci
-version:            0.11.20201230
+version:            0.11.20210101
 synopsis:           Cabal package script generator for Travis-CI
 description:
   Script generator (@haskell-ci@) for [Travis-CI](https://travis-ci.org/) for continuous-integration testing of Haskell Cabal packages.

src/HaskellCI.hs

@@ -138,7 +138,7 @@ travisFromConfigFile
 travisFromConfigFile args opts path = do
     gitconfig <- liftIO readGitConfig
     cabalFiles <- getCabalFiles (optInputType' opts path) path
-    config' <- maybe (return emptyConfig) readConfigFile (optConfig opts)
+    config' <- findConfigFile (optConfig opts)
     let config = optConfigMorphism opts config'
     pkgs <- T.mapM (configFromCabalFile config) cabalFiles
     (ghcs, prj) <- case checkVersions (cfgTestedWith config) pkgs of
@@ -224,7 +224,7 @@ bashFromConfigFile
 bashFromConfigFile args opts path = do
     gitconfig <- liftIO readGitConfig
     cabalFiles <- getCabalFiles (optInputType' opts path) path
-    config' <- maybe (return emptyConfig) readConfigFile (optConfig opts)
+    config' <- findConfigFile (optConfig opts)
     let config = optConfigMorphism opts config'
     pkgs <- T.mapM (configFromCabalFile config) cabalFiles
     (ghcs, prj) <- case checkVersions (cfgTestedWith config) pkgs of
@@ -311,7 +311,7 @@ githubFromConfigFile
 githubFromConfigFile args opts path = do
     gitconfig <- liftIO readGitConfig
     cabalFiles <- getCabalFiles (optInputType' opts path) path
-    config' <- maybe (return emptyConfig) readConfigFile (optConfig opts)
+    config' <- findConfigFile (optConfig opts)
     let config = optConfigMorphism opts config'
     pkgs <- T.mapM (configFromCabalFile config) cabalFiles
     (ghcs, prj) <- case checkVersions (cfgTestedWith config) pkgs of
@@ -367,6 +367,20 @@ regenerateGitHub opts = do
     noGitHubScript :: IO ()
     noGitHubScript = putStrLn $ "No " ++ fp ++ ", skipping GitHub config regeneration"
 
+-------------------------------------------------------------------------------
+-- Config file
+-------------------------------------------------------------------------------
+
+findConfigFile :: MonadIO m => ConfigOpt -> m Config
+findConfigFile ConfigOptNo    = return emptyConfig
+findConfigFile (ConfigOpt fp) = readConfigFile fp
+findConfigFile ConfigOptAuto  = do
+    let defaultPath = "cabal.haskell-ci"
+    exists <- liftIO (doesFileExist defaultPath)
+    if exists
+    then readConfigFile defaultPath
+    else return emptyConfig
+
 -------------------------------------------------------------------------------
 -- Patches
 -------------------------------------------------------------------------------

src/HaskellCI/Cli.hs

@@ -35,22 +35,20 @@ data Command
 
 data Options = Options
     { optOutput         :: Maybe Output
-    , optConfig         :: Maybe FilePath
+    , optConfig         :: ConfigOpt
     , optCwd            :: Maybe FilePath
     , optInputType      :: Maybe InputType
     , optConfigMorphism :: Config -> Config
     }
 
-data Output = OutputStdout | OutputFile FilePath
-
 instance Semigroup Options where
     Options b d c e f <> Options b' d' c' e' f' =
-        Options (b <|> b') (d <|> d') (c <|> c') (e <|> e') (f' . f)
+        Options (b <|> b') (d <> d') (c <|> c') (e <|> e') (f' . f)
 
 defaultOptions :: Options
 defaultOptions = Options
     { optOutput         = Nothing
-    , optConfig         = Nothing
+    , optConfig         = ConfigOptAuto
     , optCwd            = Nothing
     , optInputType      = Nothing
     , optConfigMorphism = id
@@ -61,6 +59,18 @@ optionsWithOutputFile fp = defaultOptions
     { optOutput = Just (OutputFile fp)
     }
 
+data Output = OutputStdout | OutputFile FilePath
+
+data ConfigOpt
+    = ConfigOptAuto
+    | ConfigOpt FilePath
+    | ConfigOptNo
+  deriving (Eq, Show)
+
+instance Semigroup ConfigOpt where
+    a <> ConfigOptAuto = a
+    _ <> b             = b
+
 -------------------------------------------------------------------------------
 -- InputType
 -------------------------------------------------------------------------------
@@ -83,11 +93,17 @@ optInputType' opts path =
 optionsP :: O.Parser Options
 optionsP = Options
     <$> O.optional outputP
-    <*> O.optional (O.strOption (O.long "config" <> O.metavar "CONFIGFILE" <> O.help "Configuration file"))
+    <*> configOptP
     <*> O.optional (O.strOption (O.long "cwd" <> O.metavar "Dir" <> O.help "Directory to change to"))
     <*> O.optional inputTypeP
     <*> runOptparseGrammar configGrammar
 
+configOptP :: O.Parser ConfigOpt
+configOptP = file <|> noconfig <|> pure ConfigOptAuto
+  where
+    file = ConfigOpt <$> O.strOption (O.long "config" <> O.metavar "CONFIGFILE" <> O.help "Configuration file")
+    noconfig = O.flag' ConfigOptNo (O.long "no-config" <> O.help "Don't read configuration file")
+
 outputP :: O.Parser Output
 outputP =
     OutputFile <$> O.strOption (O.long "output" <> O.short 'o' <> O.metavar "FILE" <> O.help "Output file") <|>