External code paths now have to be prefixed with @ext/.

app/Main.hs

@@ -21,7 +21,7 @@ main = do
         absOutDirPath <- Path.parseAbsDir (ensurePathIsAbs absCwdPath outDirPath)
         -- TODO(martin): Take compile options as arguments to the command, right now I hardcoded the value.
         let options = CompileOptions
-                { externalCodeDirPath = (Path.parent absWaspFilePath) </> [reldir|src|]
+                { externalCodeDirPath = (Path.parent absWaspFilePath) </> [reldir|ext|]
                 }
         result <- compile absWaspFilePath absOutDirPath options
         either putStrLn (\_ -> print ("Success!" :: String)) result

examples/todoApp/todoApp.wasp

@@ -1,6 +1,6 @@
 // Goal of this file is to re-create a TODO app from http://todomvc.com
 
-import Todo from "Todo"  // Imports from external code dir (src/).
+import Todo from "@ext/Todo"  // Imports from external code dir (ext/).
 
 // -- Entities
 entity Task {

src/Parser/ExternalCode.hs

@@ -0,0 +1,21 @@
+module Parser.ExternalCode
+    ( extCodeFilePathString
+    ) where
+
+import Text.Parsec (unexpected)
+import Text.Parsec.String (Parser)
+import Path (reldir)
+import qualified Path
+import qualified Path.Aliases as Path
+
+import qualified Parser.Common
+
+-- Parses string literal that is file path to file in external code dir.
+-- Returns file path relative to the external code dir.
+-- Example of input: "@ext/some/file.txt". Output would be: "some/file.txt".
+extCodeFilePathString :: Parser Path.RelFile
+extCodeFilePathString = do
+    path <- Parser.Common.relFilePathString
+    maybe (unexpected $ "string \"" ++ (show path) ++ "\": External code file path should start with \"@ext/\".")
+          return
+          (Path.stripProperPrefix [reldir|@ext|] path)

src/Parser/JsImport.hs

@@ -5,8 +5,8 @@ module Parser.JsImport
 import Text.Parsec (manyTill, anyChar, try)
 import Text.Parsec.Char (space)
 import Text.Parsec.String (Parser)
-import qualified Parser.Common
 
+import qualified Parser.ExternalCode
 import qualified Lexer as L
 import qualified Wasp.JsImport
 
@@ -21,5 +21,5 @@ jsImport = do
     what <- anyChar `manyTill` (try (space *> L.whiteSpace *> L.reserved L.reservedNameFrom))
     -- TODO: For now we only support double quotes here, we should also support single quotes.
     --   We would need to write this from scratch, with single quote escaping enabled.
-    from <- Parser.Common.relFilePathString
+    from <- Parser.ExternalCode.extCodeFilePathString
     return Wasp.JsImport.JsImport { Wasp.JsImport.jsImportWhat = what, Wasp.JsImport.jsImportFrom = from }

src/Parser/Style.hs

@@ -7,6 +7,7 @@ import Text.Parsec.String (Parser)
 import qualified Data.Text as Text
 
 import qualified Parser.Common
+import qualified Parser.ExternalCode
 import qualified Wasp.Style
 
 
@@ -14,7 +15,7 @@ style :: Parser Wasp.Style.Style
 style = cssFile <|> cssCode
 
 cssFile :: Parser Wasp.Style.Style
-cssFile = Wasp.Style.ExtCodeCssFile <$> Parser.Common.relFilePathString
+cssFile = Wasp.Style.ExtCodeCssFile <$> Parser.ExternalCode.extCodeFilePathString
 
 cssCode :: Parser Wasp.Style.Style
 cssCode = (Wasp.Style.CssCode . Text.pack) <$> Parser.Common.waspNamedClosure "css"

test/Parser/ExternalCodeTest.hs

@@ -0,0 +1,20 @@
+module Parser.ExternalCodeTest where
+
+import Test.Tasty.Hspec
+
+import Data.Either (isLeft)
+import Path (relfile)
+
+import Parser.ExternalCode (extCodeFilePathString)
+import Parser.Common (runWaspParser)
+
+
+spec_ParserExternalCode :: Spec
+spec_ParserExternalCode = do
+    describe "Parsing external code file path string" $ do
+        it "Correctly parses external code path in double quotes" $ do
+            runWaspParser extCodeFilePathString "\"@ext/foo/bar.txt\""
+                `shouldBe` Right [relfile|foo/bar.txt|]
+
+        it "When path does not start with @ext/, returns Left" $ do
+            isLeft (runWaspParser extCodeFilePathString "\"@ext2/foo/bar.txt\"") `shouldBe` True

test/Parser/JsImportTest.hs

@@ -12,22 +12,26 @@ import qualified Wasp
 
 spec_parseJsImport :: Spec
 spec_parseJsImport = do
-    it "Parses typical js import correctly" $ do
-        runWaspParser jsImport "import something from \"some/file.js\""
+    it "Parses external code js import correctly" $ do
+        runWaspParser jsImport "import something from \"@ext/some/file.js\""
             `shouldBe` Right (Wasp.JsImport "something" [relfile|some/file.js|])
 
     it "Parses correctly when there is whitespace up front" $ do
-        runWaspParser jsImport " import something from \"some/file.js\""
+        runWaspParser jsImport " import something from \"@ext/some/file.js\""
             `shouldBe` Right (Wasp.JsImport "something" [relfile|some/file.js|])
 
     it "Parses correctly when 'from' is part of WHAT part" $ do
-        runWaspParser jsImport "import somethingfrom from \"some/file.js\""
+        runWaspParser jsImport "import somethingfrom from \"@ext/some/file.js\""
             `shouldBe` Right (Wasp.JsImport "somethingfrom" [relfile|some/file.js|])
 
     it "Throws error if there is no whitespace after import" $ do
-        isLeft (runWaspParser jsImport "importsomething from \"some/file.js\"")
+        isLeft (runWaspParser jsImport "importsomething from \"@ext/some/file.js\"")
+            `shouldBe` True
+
+    it "Throws error if import is not from external code" $ do
+        isLeft (runWaspParser jsImport "import something from \"some/file.js\"")
             `shouldBe` True
 
     it "For now we don't support single quotes in FROM part (TODO: support them in the future!)" $ do
-        isLeft (runWaspParser jsImport "import something from 'some/file.js'")
+        isLeft (runWaspParser jsImport "import something from '@ext/some/file.js'")
             `shouldBe` True

test/Parser/StyleTest.hs

@@ -12,14 +12,14 @@ import qualified Wasp.Style
 
 spec_parseStyle :: Spec
 spec_parseStyle = do
-    it "Parses relative file path correctly" $ do
-        runWaspParser style "\"some/file.js\""
+    it "Parses external code file path correctly" $ do
+        runWaspParser style "\"@ext/some/file.js\""
             `shouldBe` Right (Wasp.Style.ExtCodeCssFile [relfile|some/file.js|])
 
     it "Parses css closure correctly" $ do
         runWaspParser style "{=css Some css code css=}"
             `shouldBe` Right (Wasp.Style.CssCode "Some css code")
 
-    it "Throws error if path is not relative" $ do
-        isLeft (runWaspParser style "\"/some/file.js\"")
+    it "Throws error if path is not external code path." $ do
+        isLeft (runWaspParser style "\"some/file.js\"")
             `shouldBe` True

test/Parser/valid.wasp

@@ -1,6 +1,6 @@
 // Test .wasp file.
 
-import something from "some/file"
+import something from "@ext/some/file"
 
 // App definition.
 app test_app {
@@ -38,7 +38,7 @@ page TestPage {
     content: {=jsx
         <div>This is a test page!</div>
     jsx=},
-    style: "test.css"
+    style: "@ext/test.css"
 }
 
 // Entity definition.