Fix #6264 Add --no-init flag to stack new

ChangeLog.md

@@ -12,6 +12,9 @@ Behavior changes:
 
 Other enhancements:
 
+* Add flag `--no-init` to Stack's `new` command to skip the initialisation of
+  the newly-created project for use with Stack.
+
 Bug fixes:
 
 ## v2.13.1 - 2023-09-29

doc/new_command.md

@@ -3,21 +3,27 @@
 # The `stack new` command
 
 ~~~text
-stack new PACKAGE_NAME [--bare] [TEMPLATE_NAME] [-p|--param KEY:VALUE] [DIR(S)]
-          [--omit-packages] [--force] [--ignore-subdirs]
+stack new PACKAGE_NAME [--bare] [--[no-]init] [TEMPLATE_NAME]
+          [-p|--param KEY:VALUE] [DIR(S)] [--omit-packages] [--force]
+          [--ignore-subdirs]
 ~~~
 
-`stack new` creates a new Stack project for a package using a project template.
+`stack new` creates a new project using a project template.
 
-The project is created in a new directory named after the package, unless the
-`--bare` flag is passed, in which case the project is created in the current
-directory.
+By default:
+
+* the project is created in a new directory named after the package. Pass the
+  `--bare` flag to create the project in the current directory; and
+
+* the project is initialised for use with Stack. Pass the `--no-init` flag to
+  skip such initialisation.
 
 The `--param <key>:<value>` option specifies a key-value pair to populate a key
 in a template. The option can be specified multiple times.
 
 The arguments specifying directories and the `--ignore-subdirs`, `--force` and
 `--omit-packages` flags are as for the [`stack init` command](init_command.md).
+These arguments are ignored if the `--no-init` flag is passed.
 
 ## Project templates
 
@@ -45,49 +51,60 @@ the default project template name is `new-template`.
 ## Examples
 
 Create a project for package `my-project` in new directory `my-project` with the
-default project template file:
+default project template file and initialise it for use with Stack:
 
 ~~~text
 stack new my-project
 ~~~
 
 Create a project for package `my-package` in the current directory with the
-default project template file:
+default project template file and initialise it for use with Stack:
 
 ~~~text
 stack new my-package --bare
 ~~~
 
-Create a project with the `rio` project template at the default repository:
+Create a project with the `rio` project template at the default repository and
+initialise it for use with Stack:
 
 ~~~text
 stack new my-project rio
 ~~~
 
 Create a project with the `mysql` project template provided by the
-`yesodweb/stack-templates` repository on GitHub:
+`yesodweb/stack-templates` repository on GitHub and initialise it for use with
+Stack:
 
 ~~~text
 stack new my-project yesodweb/mysql
 ~~~
 
 Create a project with the `my-template` project template provided by the
-`username/stack-templates` repository on Bitbucket:
+`username/stack-templates` repository on Bitbucket and initialise it for use
+with Stack:
 
 ~~~text
 stack new my-project bitbucket:username/my-template
 ~~~
 
 Create a project with the `my-template.hsfiles` project template file at
-`https://example.com`:
+`https://example.com` and initialise it for use with Stack:
 
 ~~~text
 stack new my-project https://example.com/my-template
 ~~~
 
 Create a project with the local project template file
-`<path_to_template>/my-template.hsfiles`:
+`<path_to_template>/my-template.hsfiles` and initialise it for use with Stack:
 
 ~~~text
 stack new my-project <path_to_template_file>/my-template
 ~~~
+
+Create a project with the `simple` project template file at the default
+repository (which does not use Hpack and a `package.yaml` file) and do not
+initialise it for use with Stack (`stack init` could be used subsequently):
+
+~~~text
+stack new my-project --no-init simple
+~~~

src/Stack/New.hs

@@ -215,13 +215,15 @@ instance Exception NewPrettyException
 -- than those applicable also to the @stack init@ command).
 data NewOpts = NewOpts
   { newOptsProjectName  :: PackageName
-  -- ^ Name of the project to create.
+    -- ^ Name of the project to create.
   , newOptsCreateBare   :: Bool
-  -- ^ Whether to create the project without a directory.
+    -- ^ Whether to create the project without a directory.
+  , newOptsInit         :: Bool
+    -- ^ Whether to initialise the project for use with Stack.
   , newOptsTemplate     :: Maybe TemplateName
-  -- ^ Name of the template to use.
+    -- ^ Name of the template to use.
   , newOptsNonceParams  :: Map Text Text
-  -- ^ Nonce parameters specified just for this invocation.
+    -- ^ Nonce parameters specified just for this invocation.
   }
 
 -- | Function underlying the @stack new@ command. Create a project directory
@@ -231,7 +233,7 @@ newCmd (newOpts, initOpts) =
   withGlobalProject $ withConfig YesReexec $ do
     dir <- new newOpts (forceOverwrite initOpts)
     exists <- doesFileExist $ dir </> stackDotYaml
-    when (forceOverwrite initOpts || not exists) $ do
+    when (newOptsInit newOpts && (forceOverwrite initOpts || not exists)) $ do
       go <- view globalOptsL
       initProject dir initOpts (globalResolver go)
 

src/Stack/Options/NewParser.hs

@@ -6,7 +6,8 @@ module Stack.Options.NewParser
 
 import qualified Data.Map.Strict as M
 import           Options.Applicative
-                   ( Parser, help, long, metavar, short, switch )
+                   ( Parser, help, idm, long, metavar, short, switch )
+import           Options.Applicative.Builder.Extra ( boolFlags )
 import           Stack.Init ( InitOpts )
 import           Stack.New ( NewOpts (..) )
 import           Stack.Options.InitParser ( initOptsParser )
@@ -28,6 +29,10 @@ newOptsParser = (,) <$> newOpts <*> initOptsParser
           (  long "bare"
           <> help "Do not create a subdirectory for the project."
           )
+    <*> boolFlags True
+          "init"
+          "the initialisation of the project for use with Stack."
+          idm
     <*> optional (templateNameArgument
           (  metavar "TEMPLATE_NAME"
           <> help "Name of a template - can take the form\