Read any -* as binary/unary op, and warn on unknown.

ShellCheck/Analytics.hs

@@ -75,6 +75,7 @@ basicChecks = [
     ,checkQuotedCondRegex
     ,checkForInCat
     ,checkFindExec
+    ,checkValidCondOps
     ]
 
 modifyMap = modify
@@ -514,6 +515,18 @@ checkDollarArithmeticCommand _ = return ()
 
 allModifiedVariables t = snd $ runState (doAnalysis (\x -> modify $ (++) (getModifiedVariables x)) t) []
 
+prop_checkValidCondOps1 = verify checkValidCondOps "[[ a -xz b ]]"
+prop_checkValidCondOps2 = verify checkValidCondOps "[ -M a ]"
+prop_checkValidCondOps3 = verifyNot checkValidCondOps "[ 1 = 2 -a 3 -ge 4 ]"
+prop_checkValidCondOps4 = verifyNot checkValidCondOps "[[ ! -v foo ]]"
+checkValidCondOps (TC_Binary id _ s _ _)
+    | not (s `elem` ["-nt", "-ot", "-ef", "==", "!=", "<=", ">=", "-eq", "-ne", "-lt", "-le", "-gt", "-ge", "=~", ">", "<", "="]) =
+        warn id "Unknown binary operator."
+checkValidCondOps (TC_Unary id _ s _)
+    | not (s `elem`  [ "!", "-a", "-b", "-c", "-d", "-e", "-f", "-g", "-h", "-L", "-k", "-p", "-r", "-s", "-S", "-t", "-u", "-w", "-x", "-O", "-G", "-N", "-z", "-n", "-o", "-v", "-R"]) =
+        warn id "Unknown unary operator."
+checkValidCondOps _ = return ()
+
 --- Context seeking
 
 getParentTree t =

ShellCheck/Parser.hs

@@ -212,13 +212,19 @@ readConditionContents single = do
   where
     typ = if single then SingleBracket else DoubleBracket
     readCondBinaryOp = try $ do
-        op <- choice $ (map tryOp ["-nt", "-ot", "-ef", "==", "!=", "<=", ">=", "-eq", "-ne", "-lt", "-le", "-gt", "-ge", "=~", ">", "<", "="])
+        id <- getNextId
+        op <- (choice $ (map tryOp ["==", "!=", "<=", ">=", "=~", ">", "<", "="])) <|> otherOp
         hardCondSpacing
         return op
-      where tryOp s = try $ do
+      where
+        tryOp s = try $ do
             id <- getNextId
             string s
             return $ TC_Binary id typ s
+        otherOp = try $ do
+            id <- getNextId
+            s <- readOp
+            return $ TC_Binary id typ s
 
     readCondUnaryExp = do
       op <- readCondUnaryOp
@@ -231,16 +237,16 @@ readConditionContents single = do
               fail "oops")
 
     readCondUnaryOp = try $ do
-        op <- choice $ (map tryOp [ "-a", "-b", "-c", "-d", "-e", "-f", "-g", "-h", "-L", "-k", "-p", "-r", "-s", "-S", "-t", "-u", "-w", "-x", "-O", "-G", "-N",
-                    "-z", "-n", "-o", "-v", "-R"
-                    ])
-        hardCondSpacing
-        return op
-      where tryOp s = try $ do
         id <- getNextId
-              string s
+        s <- readOp
+        hardCondSpacing
         return $ TC_Unary id typ s
 
+    readOp = try $ do
+        char '-'
+        s <- many1 letter
+        return ('-':s)
+
     readCondWord = do
         notFollowedBy2 (try (spacing >> (string "]")))
         x <- readNormalWord