Allow '# shellcheck disable=SC1234' to ignore by code.

ShellCheck/AST.hs

@@ -117,8 +117,10 @@ data Token =
     | T_UntilExpression Id [Token] [Token]
     | T_While Id
     | T_WhileExpression Id [Token] [Token]
+    | T_Annotation Id [Annotation] Token
     deriving (Show)
 
+data Annotation = DisableComment Integer deriving (Show, Eq)
 data ConditionType = DoubleBracket | SingleBracket deriving (Show, Eq)
 
 -- I apologize for nothing!
@@ -239,6 +241,7 @@ analyze f g i t =
         return $ TA_Trinary id a b c
     delve (TA_Expansion id t) = d1 t $ TA_Expansion id
     delve (TA_Base id b t) = d1 t $ TA_Base id b
+    delve (T_Annotation id anns t) = d1 t $ T_Annotation id anns
     delve t = return t
 
 getId t = case t of
@@ -331,6 +334,7 @@ getId t = case t of
         T_DollarSingleQuoted id _ -> id
         T_DollarDoubleQuoted id _ -> id
         T_DollarBracket id _ -> id
+        T_Annotation id _ _ -> id
 
 blank :: Monad m => Token -> m ()
 blank = const $ return ()

ShellCheck/Analytics.hs

@@ -154,6 +154,21 @@ runBasicTreeAnalysis checks token =
     parentTree = getParentTree token
     runTree f t = runBasicAnalysis (flip f $ parentTree) t
 
+filterByAnnotation token metadataMap =
+    Map.mapWithKey removeVals metadataMap
+  where
+    removeVals id (Metadata pos notes) =
+        Metadata pos $ filter (not . shouldIgnore id . numFor) notes
+    numFor (Note _ code _) = code
+    shouldIgnore id num =
+        any (shouldIgnoreFor num) $ getPath parents (T_Bang id)
+    shouldIgnoreFor num (T_Annotation _ anns _) =
+        any hasNum anns
+      where
+        hasNum (DisableComment ts) = num == ts
+    shouldIgnoreFor _ _ = False
+    parents = getParentTree token
+
 addNoteFor id note = modify ((id, note):)
 warn id code note = addNoteFor id $ Note WarningC code $ note
 err id code note = addNoteFor id $ Note ErrorC code $ note
@@ -218,6 +233,7 @@ isEmpty token =
 
 makeSimple (T_NormalWord _ [f]) = f
 makeSimple (T_Redirecting _ _ f) = f
+makeSimple (T_Annotation _ _ f) = f
 makeSimple t = t
 simplify = doTransform makeSimple
 
@@ -234,6 +250,7 @@ deadSimple (T_Literal _ x) = [x]
 deadSimple (T_SimpleCommand _ vars words) = concatMap (deadSimple) words
 deadSimple (T_Redirecting _ _ foo) = deadSimple foo
 deadSimple (T_DollarSingleQuoted _ s) = [s]
+deadSimple (T_Annotation _ _ s) = deadSimple s
 deadSimple _ = []
 
 (!!!) list i =
@@ -1054,11 +1071,13 @@ getCommandName (T_Redirecting _ _ w) =
     getCommandName w
 getCommandName (T_SimpleCommand _ _ (w:_)) =
     getLiteralString w
+getCommandName (T_Annotation _ _ t) = getCommandName t
 getCommandName _ = Nothing
 
 getCommandBasename = liftM basename . getCommandName
 basename = reverse . (takeWhile (/= '/')) . reverse
 
+isAssignment (T_Annotation _ _ w) = isAssignment w
 isAssignment (T_Redirecting _ _ w) = isAssignment w
 isAssignment (T_SimpleCommand _ (w:_) []) = True
 isAssignment _ = False

ShellCheck/Parser.hs

@@ -104,8 +104,12 @@ data Note = Note Severity Code String deriving (Show, Eq)
 data ParseNote = ParseNote SourcePos Severity Code String deriving (Show, Eq)
 data Metadata = Metadata SourcePos [Note] deriving (Show)
 data Severity = ErrorC | WarningC | InfoC | StyleC deriving (Show, Eq, Ord)
+data Context = ContextName SourcePos String | ContextAnnotation [Annotation]
 type Code = Integer
 
+codeForNote (Note _ code _) = code
+codeForParseNote (ParseNote _ _ code _) = code
+
 initialState = (Id $ -1, Map.empty, [])
 
 getInitialMeta pos = Metadata pos []
@@ -139,9 +143,19 @@ getParseNotes = do
     return notes
 
 addParseNote n = do
+    irrelevant <- shouldIgnoreCode (codeForParseNote n)
+    when (not irrelevant) $ do
         (a, b, notes) <- getState
         putState (a, b, n:notes)
 
+shouldIgnoreCode code = do
+    context <- getCurrentContexts
+    return $ any disabling context
+  where
+    disabling (ContextAnnotation list) =
+        any disabling' list
+    disabling _ = False
+    disabling' (DisableComment n) = code == n
 
 -- Store potential parse problems outside of parsec
 parseProblem level code msg = do
@@ -170,6 +184,8 @@ pushContext c = do
     setCurrentContexts (c:v)
 
 parseProblemAt pos level code msg = do
+    irrelevant <- shouldIgnoreCode code
+    when (not irrelevant) $
         Ms.modify (\(list, current) -> ((ParseNote pos level code msg):list, current))
 
 -- Store non-parse problems inside
@@ -226,9 +242,8 @@ acceptButWarn parser level code note = do
         parseProblemAt pos level code note
       )
 
-called s p = do
+withContext entry p = do
-    pos <- getPosition
+    pushContext entry
-    pushContext (pos, s)
     do
         v <- p
         popContext
@@ -237,6 +252,13 @@ called s p = do
         popContext
         fail $ ""
 
+called s p = do
+    pos <- getPosition
+    withContext (ContextName pos s) p
+
+withAnnotations anns p =
+    withContext (ContextAnnotation anns) p
+
 readConditionContents single = do
     readCondContents `attempting` (lookAhead $ do
                                 pos <- getPosition
@@ -615,7 +637,41 @@ condSpacingMsg soft msg = do
   space <- spacing
   when (null space) $ (if soft then parseNoteAt else parseProblemAt) pos ErrorC 1035 msg
 
+readAnnotationPrefix = do
+    char '#'
+    many linewhitespace
+    string "shellcheck"
+
+prop_readAnnotation1 = isOk readAnnotation "# shellcheck disable=1234,5678\n"
+prop_readAnnotation2 = isOk readAnnotation "# shellcheck disable=SC1234 disable=SC5678\n"
+readAnnotation = called "shellcheck annotation" $ do
+    try readAnnotationPrefix
+    many1 linewhitespace
+    values <- many1 (readDisable)
+    linefeed
+    many linewhitespace
+    return $ concat values
+  where
+    readDisable = forKey "disable" $ do
+        readCode `sepBy` char ','
+      where
+        readCode = do
+            optional $ string "SC"
+            int <- many1 digit
+            return $ DisableComment (read int)
+    forKey s p = do
+        try $ string s
+        char '='
+        value <- p
+        many linewhitespace
+        return value
+
+readAnnotations = do
+    annotations <- many (readAnnotation `thenSkip` allspacing)
+    return $ concat annotations
+
 readComment = do
+    unexpecting "shellcheck annotation" readAnnotationPrefix
     char '#'
     many $ noneOf "\r\n"
 
@@ -1229,12 +1285,23 @@ readPipeline = do
         readPipeSequence
 
 prop_readAndOr = isOk readAndOr "grep -i lol foo || exit 1"
-readAndOr = chainr1 readPipeline $ do
+prop_readAndOr1 = isOk readAndOr "# shellcheck disable=1\nfoo"
+prop_readAndOr2 = isOk readAndOr "# shellcheck disable=1\n# lol\n# shellcheck disable=3\nfoo"
+readAndOr = do
+    aid <- getNextId
+    annotations <- readAnnotations
+
+    andOr <- withAnnotations annotations $ do
+        chainr1 readPipeline $ do
             op <- g_AND_IF <|> g_OR_IF
             readLineBreak
             return $ case op of T_AND_IF id -> T_AndIf id
                                 T_OR_IF  id -> T_OrIf id
 
+    return $ if null annotations
+                then andOr
+                else T_Annotation aid annotations andOr
+
 readTerm = do
     allspacing
     m <- readAndOr
@@ -1840,10 +1907,12 @@ parseShell filename contents = do
         (Left err, (p, context)) -> ParseResult Nothing (nub $ sortNotes $ p ++ (notesForContext context) ++ ([makeErrorFor err]))
 
   where
-    notesForContext list = zipWith ($) [first, second] list
+    isName (ContextName _ _) = True
-    first (pos, str) = ParseNote pos ErrorC 1073 $
+    isName _ = False
+    notesForContext list = zipWith ($) [first, second] $ filter isName list
+    first (ContextName pos str) = ParseNote pos ErrorC 1073 $
         "Couldn't parse this " ++ str ++ "."
-    second (pos, str) = ParseNote pos InfoC 1009 $
+    second (ContextName pos str) = ParseNote pos InfoC 1009 $
         "The mentioned parser error was in this " ++ str ++ "."
 
 lt x = trace (show x) x

ShellCheck/Simple.hs

@@ -23,13 +23,30 @@ import Data.Maybe
 import Text.Parsec.Pos
 import Data.List
 
+
+prop_findsParseIssue =
+    let comments = shellCheck "echo \"$12\"" in
+        (length comments) == 1 && (scCode $ head comments) == 1037
+prop_commentDisablesParseIssue1 =
+    null $ shellCheck "#shellcheck disable=SC1037\necho \"$12\""
+prop_commentDisablesParseIssue2 =
+    null $ shellCheck "#shellcheck disable=SC1037\n#lol\necho \"$12\""
+
+prop_findsAnalysisIssue =
+    let comments = shellCheck "echo $1" in
+        (length comments) == 1 && (scCode $ head comments) == 2086
+prop_commentDisablesAnalysisIssue1 =
+    null $ shellCheck "#shellcheck disable=SC2086\necho $1"
+prop_commentDisablesAnalysisIssue2 =
+    null $ shellCheck "#shellcheck disable=SC2086\n#lol\necho $1"
+
 shellCheck :: String -> [ShellCheckComment]
 shellCheck script =
     let (ParseResult result notes) = parseShell "-" script in
         let allNotes = notes ++ (concat $ maybeToList $ do
             (tree, map) <- result
             let newMap = runAllAnalytics tree map
-            return $ notesFromMap newMap
+            return $ notesFromMap $ filterByAnnotation tree newMap
             )
         in
             map formatNote $ nub $ sortNotes allNotes