Not use the versions file for NPM tools

src/Setup/BuildPlan.purs

@@ -8,10 +8,9 @@ import Data.Argonaut.Decode (decodeJson, printJsonDecodeError, (.:))
 import Data.Array as Array
 import Data.Bifunctor (lmap)
 import Data.Either (Either(..))
-import Data.Foldable (fold)
+import Data.Foldable (elem, fold)
 import Data.Maybe (Maybe(..))
 import Data.Traversable (traverse)
-import Data.Version (Version)
 import Data.Version as Version
 import Effect (Effect)
 import Effect.Aff (error, throwError)
@@ -20,21 +19,19 @@ import Effect.Exception (Error)
 import GitHub.Actions.Core as Core
 import Setup.Data.Key (Key)
 import Setup.Data.Key as Key
-import Setup.Data.Tool (Tool)
+import Setup.Data.Tool (Tool(..))
 import Setup.Data.Tool as Tool
+import Setup.Data.VersionField (VersionField(..))
 import Text.Parsing.Parser (parseErrorMessage)
 import Text.Parsing.Parser as ParseError
 
 -- | The list of tools that should be downloaded and cached by the action
-type BuildPlan = Array { tool :: Tool, version :: Version }
+type BuildPlan = Array { tool :: Tool, versionField :: VersionField }
 
 -- | Construct the list of tools that sholud be downloaded and cached by the action
 constructBuildPlan :: Json -> ExceptT Error Effect BuildPlan
 constructBuildPlan json = map Array.catMaybes $ traverse (resolve json) Tool.allTools
 
--- | The parsed value of an input field that specifies a version
-data VersionField = Latest | Exact Version
-
 -- | Attempt to read the value of an input specifying a tool version
 getVersionField :: Key -> ExceptT Error Effect (Maybe VersionField)
 getVersionField key = do
@@ -52,19 +49,24 @@ getVersionField key = do
         pure (pure (Exact version))
 
 -- | Resolve the exact version to provide for a tool in the environment, based
--- | on the action.yml file.
-resolve :: Json -> Tool -> ExceptT Error Effect (Maybe { tool :: Tool, version :: Version })
+-- | on the action.yml file. In the case of NPM packages, bypass the action.yml
+-- | file and use 'Latest'.
+resolve :: Json -> Tool -> ExceptT Error Effect (Maybe { tool :: Tool, versionField :: VersionField })
 resolve versionsContents tool = do
   let key = Key.fromTool tool
   field <- getVersionField key
-  case field of
-    Nothing -> pure Nothing
+  case field, tool `elem` [ Psa, PursTidy ] of
+    Nothing, _ -> pure Nothing
 
-    Just (Exact v) -> liftEffect do
+    Just (Exact v), _ -> liftEffect do
       Core.info "Found exact version"
-      pure (pure { tool, version: v })
+      pure (pure { tool, versionField: Exact v })
+
+    Just Latest, true -> liftEffect do
+      Core.info $ fold [ "Fetching latest tag for ", Tool.name tool ]
+      pure (pure { tool, versionField: Latest })
 
-    Just Latest -> liftEffect do
+    Just Latest, false -> liftEffect do
       Core.info $ fold [ "Fetching latest tag for ", Tool.name tool ]
 
       let
@@ -77,4 +79,4 @@ resolve versionsContents tool = do
           throwError $ error "Unable to complete fetching version."
 
         Right v -> do
-          pure (pure { tool, version: v })
+          pure (pure { tool, versionField: Exact v })

src/Setup/Data/Tool.purs

@@ -3,18 +3,19 @@ module Setup.Data.Tool where
 import Prelude
 
 import Affjax (URL)
+import Data.Bounded.Generic (genericBottom, genericTop)
 import Data.Either (fromRight')
 import Data.Enum (class Enum, upFromIncluding)
+import Data.Enum.Generic (genericPred, genericSucc)
 import Data.Foldable (elem, fold)
 import Data.Generic.Rep (class Generic)
-import Data.Bounded.Generic (genericBottom, genericTop)
-import Data.Enum.Generic (genericPred, genericSucc)
-import Data.Version (Version, parseVersion)
-import Data.Version as Version
+import Data.Version (parseVersion)
 import Node.Path (FilePath)
 import Node.Path as Path
 import Partial.Unsafe (unsafeCrashWith)
 import Setup.Data.Platform (Platform(..), platform)
+import Setup.Data.VersionField (VersionField(..))
+import Setup.Data.VersionField as VersionField
 
 data Tool
   = PureScript
@@ -91,8 +92,8 @@ type NPMPackage = String
 
 -- | The installation method for a tool, which includes the source path necessary
 -- | to download or install the tool.
-installMethod :: Tool -> Version -> InstallMethod
-installMethod tool version = do
+installMethod :: Tool -> VersionField -> InstallMethod
+installMethod tool versionField = do
   let
     toolName = name tool
     toolRepo = repository tool
@@ -118,26 +119,31 @@ installMethod tool version = do
     Spago -> Tarball
       { source: formatGitHub'
           -- Spago has changed naming conventions from version to version
-          if version >= unsafeVersion "0.18.1" then case platform of
-            Windows -> "Windows"
-            Mac -> "macOS"
-            Linux -> "Linux"
-          else if version == unsafeVersion "0.18.0" then case platform of
-            Windows -> "windows-latest"
-            Mac -> "macOS-latest"
-            Linux -> "linux-latest"
-          else case platform of
-            Windows -> "windows"
-            Mac -> "osx"
-            Linux -> "linux"
+          case versionField of
+            Exact version 
+              | version >= unsafeVersion "0.18.1" -> 
+                case platform of
+                  Windows -> "Windows"
+                  Mac -> "macOS"
+                  Linux -> "Linux"
+              | version == unsafeVersion "0.18.1" -> 
+                case platform of
+                  Windows -> "windows-latest"
+                  Mac -> "macOS-latest"
+                  Linux -> "linux-latest"
+            _ -> 
+                case platform of
+                  Windows -> "windows"
+                  Mac -> "osx"
+                  Linux -> "linux"
       , getExecutablePath: \p -> Path.concat [ p, executableName ]
       }
 
     Psa ->
-      NPM ("purescript-psa@" <> Version.showVersion version)
+      NPM ("purescript-psa@" <> VersionField.showVersionField versionField)
 
     PursTidy ->
-      NPM ("purs-tidy@" <> Version.showVersion version)
+      NPM ("purs-tidy@" <> VersionField.showVersionField versionField)
 
     Zephyr -> Tarball
       { source: formatGitHub' $ case platform of
@@ -153,8 +159,8 @@ installMethod tool version = do
   -- Example: "v0.13.2", "0.15.2"
   formatTag :: String
   formatTag = do
-    let versionStr = Version.showVersion version
-    if tool `elem` [ PureScript, Zephyr, Psa ] then
+    let versionStr = VersionField.showVersionField versionField
+    if tool `elem` [ PureScript, Zephyr ] then
       fold [ "v", versionStr ]
     else
       versionStr

src/Setup/Data/VersionField.purs

@@ -0,0 +1,12 @@
+module Setup.Data.VersionField (VersionField(..), showVersionField) where
+
+import Data.Version (Version)
+import Data.Version as Version
+
+-- | The parsed value of an input field that specifies a version
+data VersionField = Latest | Exact Version
+
+showVersionField :: VersionField -> String
+showVersionField = case _ of
+  Latest -> "latest"
+  Exact v -> Version.showVersion v

src/Setup/GetTool.purs

@@ -5,8 +5,6 @@ import Prelude
 import Control.Monad.Except.Trans (ExceptT, mapExceptT)
 import Data.Foldable (fold)
 import Data.Maybe (Maybe(..))
-import Data.Version (Version)
-import Data.Version as Version
 import Effect.Aff (Aff)
 import Effect.Class (liftEffect)
 import Effect.Exception (Error)
@@ -16,18 +14,20 @@ import GitHub.Actions.ToolCache as ToolCache
 import Setup.Data.Platform (Platform(..), platform)
 import Setup.Data.Tool (InstallMethod(..), Tool)
 import Setup.Data.Tool as Tool
+import Setup.Data.VersionField (VersionField)
+import Setup.Data.VersionField as VersionField
 
-getTool :: { tool :: Tool, version :: Version } -> ExceptT Error Aff Unit
-getTool { tool, version } = do
+getTool :: { tool :: Tool, versionField :: VersionField } -> ExceptT Error Aff Unit
+getTool { tool, versionField } = do
   let
     name = Tool.name tool
-    installMethod = Tool.installMethod tool version
+    installMethod = Tool.installMethod tool versionField
 
   liftEffect $ Core.info $ fold [ "Fetching ", name ]
 
   case installMethod of
     Tarball opts -> do
-      mbPath <- mapExceptT liftEffect $ ToolCache.find { arch: Nothing, toolName: name, versionSpec: Version.showVersion version }
+      mbPath <- mapExceptT liftEffect $ ToolCache.find { arch: Nothing, toolName: name, versionSpec: VersionField.showVersionField versionField }
       case mbPath of
         Just path -> liftEffect do
           Core.info $ fold [ "Found cached version of ", name ]
@@ -36,7 +36,7 @@ getTool { tool, version } = do
         Nothing -> do
           downloadPath <- ToolCache.downloadTool' opts.source
           extractedPath <- ToolCache.extractTar' downloadPath
-          cached <- ToolCache.cacheFile { sourceFile: opts.getExecutablePath extractedPath, tool: name, version: Version.showVersion version, targetFile: name, arch: Nothing }
+          cached <- ToolCache.cacheFile { sourceFile: opts.getExecutablePath extractedPath, tool: name, version: VersionField.showVersionField versionField, targetFile: name, arch: Nothing }
 
           liftEffect do
             Core.info $ fold [ "Cached path ", cached, ", adding to PATH" ]