Let annotations take effect earlier (fixes #2534)

src/ShellCheck/Checker.hs

@@ -496,6 +496,17 @@ prop_fileCannotEnableExternalSources2 = result == [1144]
         csCheckSourced = True
     }
 
+prop_rcCanSuppressEarlyProblems1 = null result
+  where
+    result = checkWithRc "disable=1071" emptyCheckSpec {
+        csScript = "#!/bin/zsh\necho $1"
+    }
+
+prop_rcCanSuppressEarlyProblems2 = null result
+  where
+    result = checkWithRc "disable=1104" emptyCheckSpec {
+        csScript = "!/bin/bash\necho 'hello world'"
+    }
 
 return []
 runTests = $quickCheckAll

src/ShellCheck/Parser.hs

@@ -38,7 +38,6 @@ import Data.Functor
 import Data.List (isPrefixOf, isInfixOf, isSuffixOf, partition, sortBy, intercalate, nub, find)
 import Data.Maybe
 import Data.Monoid
-import Debug.Trace -- STRIP
 import GHC.Exts (sortWith)
 import Prelude hiding (readList)
 import System.IO
@@ -458,8 +457,8 @@ called s p = do
     pos <- getPosition
     withContext (ContextName pos s) p
 
-withAnnotations anns =
-    withContext (ContextAnnotation anns)
+withAnnotations anns p =
+    if null anns then p else withContext (ContextAnnotation anns) p
 
 readConditionContents single =
     readCondContents `attempting` lookAhead (do
@@ -3258,44 +3257,51 @@ prop_readScript3 = isWarning readScript "#!/bin/bash\necho hello\xA0world"
 prop_readScript4 = isWarning readScript "#!/usr/bin/perl\nfoo=("
 prop_readScript5 = isOk readScript "#!/bin/bash\n#This is an empty script\n\n"
 prop_readScript6 = isOk readScript "#!/usr/bin/env -S X=FOO bash\n#This is an empty script\n\n"
+prop_readScript7 = isOk readScript "#!/bin/zsh\n# shellcheck disable=SC1071\nfor f (a b); echo $f\n"
 readScriptFile sourced = do
     start <- startSpan
     pos <- getPosition
-    optional $ do
-        readUtf8Bom
-        parseProblem ErrorC 1082
-            "This file has a UTF-8 BOM. Remove it with: LC_CTYPE=C sed '1s/^...//' < yourscript ."
-    shebang <- readShebang <|> readEmptyLiteral
-    let (T_Literal _ shebangString) = shebang
-    allspacing
-    annotationStart <- startSpan
-    fileAnnotations <- readAnnotations
     rcAnnotations <- if sourced
                      then return []
                      else do
                         filename <- Mr.asks currentFilename
                         readConfigFile filename
-    let annotations = fileAnnotations ++ rcAnnotations
-    annotationId <- endSpan annotationStart
-    let shellAnnotationSpecified =
-            any (\x -> case x of ShellOverride {} -> True; _ -> False) annotations
-    shellFlagSpecified <- isJust <$> Mr.asks shellTypeOverride
-    let ignoreShebang = shellAnnotationSpecified || shellFlagSpecified
 
-    unless ignoreShebang $
-        verifyShebang pos (executableFromShebang shebangString)
-    if ignoreShebang || isValidShell (executableFromShebang shebangString) /= Just False
-      then do
-            commands <- withAnnotations annotations readCompoundListOrEmpty
-            id <- endSpan start
-            verifyEof
-            let script = T_Annotation annotationId annotations $
-                            T_Script id shebang commands
-            reparseIndices script
-        else do
-            many anyChar
-            id <- endSpan start
-            return $ T_Script id shebang []
+    -- Put the rc annotations on the stack so that one can ignore e.g. SC1084 in .shellcheckrc
+    withAnnotations rcAnnotations $ do
+        hasBom <- wasIncluded readUtf8Bom
+        shebang <- readShebang <|> readEmptyLiteral
+        let (T_Literal _ shebangString) = shebang
+        allspacing
+        annotationStart <- startSpan
+        fileAnnotations <- readAnnotations
+
+        -- Similarly put the filewide annotations on the stack to allow earlier suppression
+        withAnnotations fileAnnotations $ do
+            when (hasBom) $
+                parseProblemAt pos ErrorC 1082
+                    "This file has a UTF-8 BOM. Remove it with: LC_CTYPE=C sed '1s/^...//' < yourscript ."
+            let annotations = fileAnnotations ++ rcAnnotations
+            annotationId <- endSpan annotationStart
+            let shellAnnotationSpecified =
+                    any (\x -> case x of ShellOverride {} -> True; _ -> False) annotations
+            shellFlagSpecified <- isJust <$> Mr.asks shellTypeOverride
+            let ignoreShebang = shellAnnotationSpecified || shellFlagSpecified
+
+            unless ignoreShebang $
+                verifyShebang pos (executableFromShebang shebangString)
+            if ignoreShebang || isValidShell (executableFromShebang shebangString) /= Just False
+              then do
+                    commands <- readCompoundListOrEmpty
+                    id <- endSpan start
+                    verifyEof
+                    let script = T_Annotation annotationId annotations $
+                                    T_Script id shebang commands
+                    reparseIndices script
+                else do
+                    many anyChar
+                    id <- endSpan start
+                    return $ T_Script id shebang []
 
   where
     verifyShebang pos s = do
@@ -3388,16 +3394,6 @@ parsesCleanly parser string = runIdentity $ do
             return $ Just . null $ parseNotes userState ++ parseProblems systemState
         (Left _, _) -> return Nothing
 
--- For printf debugging: print the value of an expression
--- Example: return $ dump $ T_Literal id [c]
-dump :: Show a => a -> a     -- STRIP
-dump x = trace (show x) x    -- STRIP
-
--- Like above, but print a specific expression:
--- Example: return $ dumps ("Returning: " ++ [c])  $ T_Literal id [c]
-dumps :: Show x => x -> a -> a -- STRIP
-dumps t = trace (show t)       -- STRIP
-
 parseWithNotes parser = do
     item <- parser
     state <- getState