Allow specifying external-sources=true in shellcheckrc (fixes #1818)

src/ShellCheck/Formatter/CheckStyle.hs

@@ -48,7 +48,7 @@ outputResults cr sys =
     fileGroups = groupWith sourceFile comments
     outputGroup group = do
         let filename = sourceFile (head group)
-        result <- (siReadFile sys) filename
+        result <- siReadFile sys (Just True) filename
         let contents = either (const "") id result
         outputFile filename contents group
 

src/ShellCheck/Formatter/Diff.hs

@@ -90,7 +90,7 @@ reportResult foundIssues reportedIssues color result sys = do
     mapM_ output $ M.toList fixmap
   where
     output (name, fix) = do
-        file <- (siReadFile sys) name
+        file <- siReadFile sys (Just True) name
         case file of
             Right contents -> do
                 putStrLn $ formatDoc color $ makeDiff name contents fix

src/ShellCheck/Formatter/GCC.hs

@@ -43,7 +43,7 @@ outputAll cr sys = mapM_ f groups
     f :: [PositionedComment] -> IO ()
     f group = do
         let filename = sourceFile (head group)
-        result <- (siReadFile sys) filename
+        result <- siReadFile sys (Just True) filename
         let contents = either (const "") id result
         outputResult filename contents group
 

src/ShellCheck/Formatter/JSON1.hs

@@ -117,7 +117,7 @@ collectResult ref cr sys = mapM_ f groups
     f :: [PositionedComment] -> IO ()
     f group = do
         let filename = sourceFile (head group)
-        result <- siReadFile sys filename
+        result <- siReadFile sys (Just True) filename
         let contents = either (const "") id result
         let comments' = makeNonVirtual comments contents
         modifyIORef ref (\x -> comments' ++ x)

src/ShellCheck/Formatter/TTY.hs

@@ -121,7 +121,7 @@ outputResult options ref result sys = do
 
 outputForFile color sys comments = do
     let fileName = sourceFile (head comments)
-    result <- (siReadFile sys) fileName
+    result <- siReadFile sys (Just True) fileName
     let contents = either (const "") id result
     let fileLinesList = lines contents
     let lineCount = length fileLinesList