Stable version 0.3.6

This release is dedicated to Maxis: shaping the 90s
for yours truly with SimCity, SimCopter and El-Fish.

.gitignore

@@ -0,0 +1,15 @@
+# Created by http://www.gitignore.io
+
+### Haskell ###
+dist
+cabal-dev
+*.o
+*.hi
+*.chi
+*.chs.h
+.virtualenv
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+cabal.config
+

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,88 @@
+# ShellCheck - A shell script static analysis tool
+
+http://www.shellcheck.net
+
+Copyright 2012-2015, Vidar 'koala_man' Holen
+Licensed under the GNU Affero General Public License, v3
+
+The goals of ShellCheck are:
+
+  - To point out and clarify typical beginner's syntax issues,
+    that causes a shell to give cryptic error messages.
+
+  - To point out and clarify typical intermediate level semantic problems,
+    that causes a shell to behave strangely and counter-intuitively.
+
+  - To point out subtle caveats, corner cases and pitfalls, that may cause an
+    advanced user's otherwise working script to fail under future circumstances.
+
+ShellCheck is written in Haskell, and requires 2 GB of memory to compile.
+
+## Installing
+
+On systems with Cabal:
+
+    cabal update
+    cabal install shellcheck
+
+On Debian based distros:
+
+    apt-get install shellcheck
+
+On OS X with homebrew:
+
+    brew install shellcheck
+
+ShellCheck is also available as an online service:
+
+    http://www.shellcheck.net
+
+## Building with Cabal
+
+This sections describes how to build ShellCheck from a source directory.
+
+First, make sure cabal is installed. On Debian based distros:
+
+    apt-get install cabal-install
+
+On Fedora:
+
+    yum install cabal-install
+
+On Mac OS X with homebrew (http://brew.sh/):
+
+    brew install cabal-install
+
+On Mac OS X with MacPorts (http://www.macports.org/):
+
+    port install hs-cabal-install
+
+Let cabal update itself, in case your distro version is outdated:
+
+    $ cabal update
+    $ cabal install cabal-install
+
+With cabal installed, cd to the ShellCheck source directory and:
+
+    $ cabal install
+
+This will install ShellCheck to your ~/.cabal/bin directory.
+
+Add the directory to your PATH (for bash, add this to your ~/.bashrc file):
+
+    export PATH=$HOME/.cabal/bin:$PATH
+
+Verify that your PATH is set up correctly:
+
+    $ which shellcheck
+    ~/.cabal/bin/shellcheck
+
+## Running tests
+
+To run the unit test suite:
+
+    cabal configure --enable-tests
+    cabal build
+    cabal test
+
+Happy ShellChecking!

Setup.hs

@@ -0,0 +1,43 @@
+import Distribution.PackageDescription (
+  HookedBuildInfo,
+  emptyHookedBuildInfo )
+import Distribution.Simple (
+  Args,
+  UserHooks ( preSDist ),
+  defaultMainWithHooks,
+  simpleUserHooks )
+import Distribution.Simple.Setup ( SDistFlags )
+
+-- | This requires the process package from,
+--
+--   https://hackage.haskell.org/package/process
+--
+import System.Process ( callCommand )
+
+
+-- | This will use almost the default implementation, except we switch
+--   out the default pre-sdist hook with our own, 'myPreSDist'.
+--
+main = defaultMainWithHooks myHooks
+  where
+    myHooks = simpleUserHooks { preSDist = myPreSDist }
+
+
+-- | This hook will be executed before e.g. @cabal sdist@. It runs
+--   pandoc to create the man page from shellcheck.1.md. If the pandoc
+--   command is not found, this will fail with an error message:
+--
+--     /bin/sh: pandoc: command not found
+--
+--   Since the man page is listed in the Extra-Source-Files section of
+--   our cabal file, a failure here should result in a failure to
+--   create the distribution tarball (that's a good thing).
+--
+myPreSDist :: Args -> SDistFlags -> IO HookedBuildInfo
+myPreSDist _ _ = do
+  putStrLn "Building the man page..."
+  putStrLn pandoc_cmd
+  callCommand pandoc_cmd
+  return emptyHookedBuildInfo
+  where
+    pandoc_cmd = "pandoc -s -t man shellcheck.1.md -o shellcheck.1"

ShellCheck.cabal

@@ -0,0 +1,86 @@
+Name:             ShellCheck
+Version:          0.3.6
+Synopsis:         Shell script analysis tool
+License:          AGPL-3
+License-file:     LICENSE
+Category:         Static Analysis
+Author:           Vidar Holen
+Maintainer:       vidar@vidarholen.net
+Homepage:         http://www.shellcheck.net/
+Build-Type:       Simple
+Cabal-Version:    >= 1.8
+Bug-reports:      https://github.com/koalaman/shellcheck/issues
+Description:
+  The goals of ShellCheck are:
+  .
+  * To point out and clarify typical beginner's syntax issues,
+    that causes a shell to give cryptic error messages.
+  .
+  * To point out and clarify typical intermediate level semantic problems,
+    that causes a shell to behave strangely and counter-intuitively.
+  .
+  * To point out subtle caveats, corner cases and pitfalls, that may cause an
+    advanced user's otherwise working script to fail under future circumstances.
+
+Extra-Source-Files:
+    -- documentation
+    README.md
+    shellcheck.1.md
+    -- built with a cabal sdist hook
+    shellcheck.1
+    -- tests
+    test/shellcheck.hs
+
+source-repository head
+    type: git
+    location: git://github.com/koalaman/shellcheck.git
+
+library
+    build-depends:
+      base >= 4 && < 5,
+      containers,
+      directory,
+      json,
+      mtl,
+      parsec,
+      regex-compat,
+      QuickCheck >= 2.7.4
+    exposed-modules:
+      ShellCheck.Analytics
+      ShellCheck.AST
+      ShellCheck.Data
+      ShellCheck.Options
+      ShellCheck.Parser
+      ShellCheck.Simple
+    other-modules:
+      Paths_ShellCheck
+
+executable shellcheck
+    build-depends:
+      ShellCheck,
+      base >= 4 && < 5,
+      containers,
+      directory,
+      json,
+      mtl,
+      parsec,
+      regex-compat,
+      transformers,
+      QuickCheck >= 2.7.4
+    main-is: shellcheck.hs
+
+test-suite test-shellcheck
+    type: exitcode-stdio-1.0
+    build-depends:
+      ShellCheck,
+      base >= 4 && < 5,
+      containers,
+      directory,
+      json,
+      mtl,
+      parsec,
+      regex-compat,
+      transformers,
+      QuickCheck >= 2.7.4
+    main-is: test/shellcheck.hs
+

ShellCheck/AST.hs

@@ -0,0 +1,361 @@
+{-
+    This file is part of ShellCheck.
+    http://www.vidarholen.net/contents/shellcheck
+
+    ShellCheck is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    ShellCheck is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+-}
+module ShellCheck.AST where
+
+import Control.Monad
+import Control.Monad.Identity
+import qualified Text.Regex as Re
+
+data Id = Id Int deriving (Show, Eq, Ord)
+
+data Quoted = Quoted | Unquoted deriving (Show, Eq)
+data Dashed = Dashed | Undashed deriving (Show, Eq)
+data AssignmentMode = Assign | Append deriving (Show, Eq)
+data FunctionKeyword = FunctionKeyword Bool deriving (Show, Eq)
+data FunctionParentheses = FunctionParentheses Bool deriving (Show, Eq)
+data CaseType = CaseBreak | CaseFallThrough | CaseContinue deriving (Show, Eq)
+
+data Token =
+    TA_Binary Id String Token Token
+    | TA_Expansion Id [Token]
+    | TA_Index Id Token
+    | TA_Sequence Id [Token]
+    | TA_Trinary Id Token Token Token
+    | TA_Unary Id String Token
+    | TC_And Id ConditionType String Token Token
+    | TC_Binary Id ConditionType String Token Token
+    | TC_Group Id ConditionType Token
+    | TC_Noary Id ConditionType Token
+    | TC_Or Id ConditionType String Token Token
+    | TC_Unary Id ConditionType String Token
+    | T_AND_IF Id
+    | T_AndIf Id (Token) (Token)
+    | T_Arithmetic Id Token
+    | T_Array Id [Token]
+    | T_IndexedElement Id Token Token
+    | T_Assignment Id AssignmentMode String (Maybe Token) Token
+    | T_Backgrounded Id Token
+    | T_Backticked Id [Token]
+    | T_Bang Id
+    | T_Banged Id Token
+    | T_BraceExpansion Id String
+    | T_BraceGroup Id [Token]
+    | T_CLOBBER Id
+    | T_Case Id
+    | T_CaseExpression Id Token [(CaseType, [Token], [Token])]
+    | T_Condition Id ConditionType Token
+    | T_DGREAT Id
+    | T_DLESS Id
+    | T_DLESSDASH Id
+    | T_DSEMI Id
+    | T_Do Id
+    | T_DollarArithmetic Id Token
+    | T_DollarBraced Id Token
+    | T_DollarBracket Id Token
+    | T_DollarDoubleQuoted Id [Token]
+    | T_DollarExpansion Id [Token]
+    | T_DollarSingleQuoted Id String
+    | T_Done Id
+    | T_DoubleQuoted Id [Token]
+    | T_EOF Id
+    | T_Elif Id
+    | T_Else Id
+    | T_Esac Id
+    | T_Extglob Id String [Token]
+    | T_FdRedirect Id String Token
+    | T_Fi Id
+    | T_For Id
+    | T_ForArithmetic Id Token Token Token [Token]
+    | T_ForIn Id String [Token] [Token]
+    | T_Function Id FunctionKeyword FunctionParentheses String Token
+    | T_GREATAND Id
+    | T_Glob Id String
+    | T_Greater Id
+    | T_HereDoc Id Dashed Quoted String [Token]
+    | T_HereString Id Token
+    | T_If Id
+    | T_IfExpression Id [([Token],[Token])] [Token]
+    | T_In  Id
+    | T_IoFile Id Token Token
+    | T_LESSAND Id
+    | T_LESSGREAT Id
+    | T_Lbrace Id
+    | T_Less Id
+    | T_Literal Id String
+    | T_Lparen Id
+    | T_NEWLINE Id
+    | T_NormalWord Id [Token]
+    | T_OR_IF Id
+    | T_OrIf Id (Token) (Token)
+    | T_Pipeline Id [Token] [Token] -- [Pipe separators] [Commands]
+    | T_ProcSub Id String [Token]
+    | T_Rbrace Id
+    | T_Redirecting Id [Token] Token
+    | T_Rparen Id
+    | T_Script Id String [Token]
+    | T_Select Id
+    | T_SelectIn Id String [Token] [Token]
+    | T_Semi Id
+    | T_SimpleCommand Id [Token] [Token]
+    | T_SingleQuoted Id String
+    | T_Subshell Id [Token]
+    | T_Then Id
+    | T_Until Id
+    | T_UntilExpression Id [Token] [Token]
+    | T_While Id
+    | T_WhileExpression Id [Token] [Token]
+    | T_Annotation Id [Annotation] Token
+    | T_Pipe Id String
+    | T_CoProc Id (Maybe String) Token
+    | T_CoProcBody Id Token
+    deriving (Show)
+
+data Annotation = DisableComment Integer deriving (Show, Eq)
+data ConditionType = DoubleBracket | SingleBracket deriving (Show, Eq)
+
+-- I apologize for nothing!
+lolHax s = Re.subRegex (Re.mkRegex "(Id [0-9]+)") (show s) "(Id 0)"
+instance Eq Token where
+    (==) a b = lolHax a == lolHax b
+
+
+analyze :: Monad m => (Token -> m ()) -> (Token -> m ()) -> (Token -> Token) -> Token -> m Token
+analyze f g i =
+    round
+  where
+    round t = do
+        f t
+        newT <- delve t
+        g t
+        return . i $ newT
+    roundAll = mapM round
+
+    roundMaybe Nothing = return Nothing
+    roundMaybe (Just v) = do
+        s <- round v
+        return (Just s)
+
+    dl l v = do
+        x <- roundAll l
+        return $ v x
+    dll l m v = do
+        x <- roundAll l
+        y <- roundAll m
+        return $ v x m
+    d1 t v = do
+        x <- round t
+        return $ v x
+    d2 t1 t2 v = do
+        x <- round t1
+        y <- round t2
+        return $ v x y
+
+    delve (T_NormalWord id list) = dl list $ T_NormalWord id
+    delve (T_DoubleQuoted id list) = dl list $ T_DoubleQuoted id
+    delve (T_DollarDoubleQuoted id list) = dl list $ T_DollarDoubleQuoted id
+    delve (T_DollarExpansion id list) = dl list $ T_DollarExpansion id
+    delve (T_Backticked id list) = dl list $ T_Backticked id
+    delve (T_DollarArithmetic id c) = d1 c $ T_DollarArithmetic id
+    delve (T_DollarBracket id c) = d1 c $ T_DollarBracket id
+    delve (T_IoFile id op file) = d2 op file $ T_IoFile id
+    delve (T_HereString id word) = d1 word $ T_HereString id
+    delve (T_FdRedirect id v t) = d1 t $ T_FdRedirect id v
+    delve (T_Assignment id mode var index value) = do
+        a <- roundMaybe index
+        b <- round value
+        return $ T_Assignment id mode var a b
+    delve (T_Array id t) = dl t $ T_Array id
+    delve (T_IndexedElement id t1 t2) = d2 t1 t2 $ T_IndexedElement id
+    delve (T_Redirecting id redirs cmd) = do
+        a <- roundAll redirs
+        b <- round cmd
+        return $ T_Redirecting id a b
+    delve (T_SimpleCommand id vars cmds) = dll vars cmds $ T_SimpleCommand id
+    delve (T_Pipeline id l1 l2) = dll l1 l2 $ T_Pipeline id
+    delve (T_Banged id l) = d1 l $ T_Banged id
+    delve (T_AndIf id t u) = d2 t u $ T_AndIf id
+    delve (T_OrIf id t u) = d2 t u $ T_OrIf id
+    delve (T_Backgrounded id l) = d1 l $ T_Backgrounded id
+    delve (T_Subshell id l) = dl l $ T_Subshell id
+    delve (T_ProcSub id typ l) = dl l $ T_ProcSub id typ
+    delve (T_Arithmetic id c) = d1 c $ T_Arithmetic id
+    delve (T_IfExpression id conditions elses) = do
+        newConds <- mapM (\(c, t) -> do
+                            x <- mapM round c
+                            y <- mapM round t
+                            return (x,y)
+                    ) conditions
+        newElses <- roundAll elses
+        return $ T_IfExpression id newConds newElses
+    delve (T_BraceGroup id l) = dl l $ T_BraceGroup id
+    delve (T_WhileExpression id c l) = dll c l $ T_WhileExpression id
+    delve (T_UntilExpression id c l) = dll c l $ T_UntilExpression id
+    delve (T_ForIn id v w l) = dll w l $ T_ForIn id v
+    delve (T_SelectIn id v w l) = dll w l $ T_SelectIn id v
+    delve (T_CaseExpression id word cases) = do
+        newWord <- round word
+        newCases <- mapM (\(o, c, t) -> do
+                            x <- mapM round c
+                            y <- mapM round t
+                            return (o, x,y)
+                        ) cases
+        return $ T_CaseExpression id newWord newCases
+
+    delve (T_ForArithmetic id a b c group) = do
+        x <- round a
+        y <- round b
+        z <- round c
+        list <- mapM round group
+        return $ T_ForArithmetic id x y z list
+
+    delve (T_Script id s l) = dl l $ T_Script id s
+    delve (T_Function id a b name body) = d1 body $ T_Function id a b name
+    delve (T_Condition id typ token) = d1 token $ T_Condition id typ
+    delve (T_Extglob id str l) = dl l $ T_Extglob id str
+    delve (T_DollarBraced id op) = d1 op $ T_DollarBraced id
+    delve (T_HereDoc id d q str l) = dl l $ T_HereDoc id d q str
+
+    delve (TC_And id typ str t1 t2) = d2 t1 t2 $ TC_And id typ str
+    delve (TC_Or id typ str t1 t2) = d2 t1 t2 $ TC_Or id typ str
+    delve (TC_Group id typ token) = d1 token $ TC_Group id typ
+    delve (TC_Binary id typ op lhs rhs) = d2 lhs rhs $ TC_Binary id typ op
+    delve (TC_Unary id typ op token) = d1 token $ TC_Unary id typ op
+    delve (TC_Noary id typ token) = d1 token $ TC_Noary id typ
+
+    delve (TA_Binary id op t1 t2) = d2 t1 t2 $ TA_Binary id op
+    delve (TA_Unary id op t1) = d1 t1 $ TA_Unary id op
+    delve (TA_Sequence id l) = dl l $ TA_Sequence id
+    delve (TA_Trinary id t1 t2 t3) = do
+        a <- round t1
+        b <- round t2
+        c <- round t3
+        return $ TA_Trinary id a b c
+    delve (TA_Expansion id t) = dl t $ TA_Expansion id
+    delve (TA_Index id t) = d1 t $ TA_Index id
+    delve (T_Annotation id anns t) = d1 t $ T_Annotation id anns
+    delve (T_CoProc id var body) = d1 body $ T_CoProc id var
+    delve (T_CoProcBody id t) = d1 t $ T_CoProcBody id
+    delve t = return t
+
+getId t = case t of
+        T_AND_IF id  -> id
+        T_OR_IF id  -> id
+        T_DSEMI id  -> id
+        T_Semi id  -> id
+        T_DLESS id  -> id
+        T_DGREAT id  -> id
+        T_LESSAND id  -> id
+        T_GREATAND id  -> id
+        T_LESSGREAT id  -> id
+        T_DLESSDASH id  -> id
+        T_CLOBBER id  -> id
+        T_If id  -> id
+        T_Then id  -> id
+        T_Else id  -> id
+        T_Elif id  -> id
+        T_Fi id  -> id
+        T_Do id  -> id
+        T_Done id  -> id
+        T_Case id  -> id
+        T_Esac id  -> id
+        T_While id  -> id
+        T_Until id  -> id
+        T_For id  -> id
+        T_Select id  -> id
+        T_Lbrace id  -> id
+        T_Rbrace id  -> id
+        T_Lparen id  -> id
+        T_Rparen id  -> id
+        T_Bang id  -> id
+        T_In  id  -> id
+        T_NEWLINE id  -> id
+        T_EOF id  -> id
+        T_Less id  -> id
+        T_Greater id  -> id
+        T_SingleQuoted id _  -> id
+        T_Literal id _  -> id
+        T_NormalWord id _  -> id
+        T_DoubleQuoted id _  -> id
+        T_DollarExpansion id _  -> id
+        T_DollarBraced id _  -> id
+        T_DollarArithmetic id _  -> id
+        T_BraceExpansion id _  -> id
+        T_IoFile id _ _  -> id
+        T_HereDoc id _ _ _ _ -> id
+        T_HereString id _  -> id
+        T_FdRedirect id _ _  -> id
+        T_Assignment id _ _ _ _  -> id
+        T_Array id _  -> id
+        T_IndexedElement id _ _  -> id
+        T_Redirecting id _ _  -> id
+        T_SimpleCommand id _ _  -> id
+        T_Pipeline id _ _  -> id
+        T_Banged id _  -> id
+        T_AndIf id _ _ -> id
+        T_OrIf id _ _ -> id
+        T_Backgrounded id _  -> id
+        T_IfExpression id _ _  -> id
+        T_Subshell id _  -> id
+        T_BraceGroup id _  -> id
+        T_WhileExpression id _ _  -> id
+        T_UntilExpression id _ _  -> id
+        T_ForIn id _ _ _  -> id
+        T_SelectIn id _ _ _  -> id
+        T_CaseExpression id _ _ -> id
+        T_Function id _ _ _ _  -> id
+        T_Arithmetic id _  -> id
+        T_Script id _ _  -> id
+        T_Condition id _ _  -> id
+        T_Extglob id _ _ -> id
+        T_Backticked id _ -> id
+        TC_And id _ _ _ _  -> id
+        TC_Or id _ _ _ _  -> id
+        TC_Group id _ _  -> id
+        TC_Binary id _ _ _ _  -> id
+        TC_Unary id _ _ _  -> id
+        TC_Noary id _ _  -> id
+        TA_Binary id _ _ _  -> id
+        TA_Unary id _ _  -> id
+        TA_Sequence id _  -> id
+        TA_Trinary id _ _ _  -> id
+        TA_Expansion id _  -> id
+        TA_Index id _  -> id
+        T_ProcSub id _ _ -> id
+        T_Glob id _ -> id
+        T_ForArithmetic id _ _ _ _ -> id
+        T_DollarSingleQuoted id _ -> id
+        T_DollarDoubleQuoted id _ -> id
+        T_DollarBracket id _ -> id
+        T_Annotation id _ _ -> id
+        T_Pipe id _ -> id
+        T_CoProc id _ _ -> id
+        T_CoProcBody id _ -> id
+
+blank :: Monad m => Token -> m ()
+blank = const $ return ()
+doAnalysis f = analyze f blank id
+doStackAnalysis startToken endToken = analyze startToken endToken id
+doTransform i = runIdentity . analyze blank blank i
+
+isLoop t = case t of
+        T_WhileExpression {} -> True
+        T_UntilExpression {} -> True
+        T_ForIn {} -> True
+        T_ForArithmetic {} -> True
+        T_SelectIn {}  -> True
+        _ -> False

ShellCheck/Data.hs

@@ -0,0 +1,75 @@
+module ShellCheck.Data where
+
+import Data.Version (showVersion)
+import Paths_ShellCheck (version)
+
+shellcheckVersion = showVersion version
+
+internalVariables = [
+    -- Generic
+    "", "_", "rest", "REST",
+
+    -- Bash
+    "BASH", "BASHOPTS", "BASHPID", "BASH_ALIASES", "BASH_ARGC",
+    "BASH_ARGV", "BASH_CMDS", "BASH_COMMAND", "BASH_EXECUTION_STRING",
+    "BASH_LINENO", "BASH_REMATCH", "BASH_SOURCE", "BASH_SUBSHELL",
+    "BASH_VERSINFO", "BASH_VERSION", "COMP_CWORD", "COMP_KEY",
+    "COMP_LINE", "COMP_POINT", "COMP_TYPE", "COMP_WORDBREAKS",
+    "COMP_WORDS", "COPROC", "DIRSTACK", "EUID", "FUNCNAME", "GROUPS",
+    "HISTCMD", "HOSTNAME", "HOSTTYPE", "LINENO", "MACHTYPE", "MAPFILE",
+    "OLDPWD", "OPTARG", "OPTIND", "OSTYPE", "PIPESTATUS", "PPID", "PWD",
+    "RANDOM", "READLINE_LINE", "READLINE_POINT", "REPLY", "SECONDS",
+    "SHELLOPTS", "SHLVL", "UID", "BASH_ENV", "BASH_XTRACEFD", "CDPATH",
+    "COLUMNS", "COMPREPLY", "EMACS", "ENV", "FCEDIT", "FIGNORE",
+    "FUNCNEST", "GLOBIGNORE", "HISTCONTROL", "HISTFILE", "HISTFILESIZE",
+    "HISTIGNORE", "HISTSIZE", "HISTTIMEFORMAT", "HOME", "HOSTFILE", "IFS",
+    "IGNOREEOF", "INPUTRC", "LANG", "LC_ALL", "LC_COLLATE", "LC_CTYPE",
+    "LC_MESSAGES", "LC_NUMERIC", "LINES", "MAIL", "MAILCHECK", "MAILPATH",
+    "OPTERR", "PATH", "POSIXLY_CORRECT", "PROMPT_COMMAND",
+    "PROMPT_DIRTRIM", "PS1", "PS2", "PS3", "PS4", "SHELL", "TIMEFORMAT",
+    "TMOUT", "TMPDIR", "auto_resume", "histchars", "COPROC",
+
+    -- Other
+    "USER", "TZ", "TERM"
+  ]
+
+variablesWithoutSpaces = [
+    "$", "-", "?", "!",
+    "BASHPID", "BASH_ARGC", "BASH_LINENO", "BASH_SUBSHELL", "EUID", "LINENO",
+    "OPTIND", "PPID", "RANDOM", "SECONDS", "SHELLOPTS", "SHLVL", "UID",
+    "COLUMNS", "HISTFILESIZE", "HISTSIZE", "LINES"
+  ]
+
+commonCommands = [
+    "admin", "alias", "ar", "asa", "at", "awk", "basename", "batch",
+    "bc", "bg", "break", "c99", "cal", "cat", "cd", "cflow", "chgrp",
+    "chmod", "chown", "cksum", "cmp", "colon", "comm", "command",
+    "compress", "continue", "cp", "crontab", "csplit", "ctags", "cut",
+    "cxref", "date", "dd", "delta", "df", "diff", "dirname", "dot",
+    "du", "echo", "ed", "env", "eval", "ex", "exec", "exit", "expand",
+    "export", "expr", "fc", "fg", "file", "find", "fold", "fort77",
+    "fuser", "gencat", "get", "getconf", "getopts", "grep", "hash",
+    "head", "iconv", "ipcrm", "ipcs", "jobs", "join", "kill", "lex",
+    "link", "ln", "locale", "localedef", "logger", "logname", "lp",
+    "ls", "m4", "mailx", "make", "man", "mesg", "mkdir", "mkfifo",
+    "more", "mv", "newgrp", "nice", "nl", "nm", "nohup", "od", "paste",
+    "patch", "pathchk", "pax", "pr", "printf", "prs", "ps", "pwd",
+    "qalter", "qdel", "qhold", "qmove", "qmsg", "qrerun", "qrls",
+    "qselect", "qsig", "qstat", "qsub", "read", "readonly", "renice",
+    "return", "rm", "rmdel", "rmdir", "sact", "sccs", "sed", "set",
+    "sh", "shift", "sleep", "sort", "split", "strings", "strip", "stty",
+    "tabs", "tail", "talk", "tee", "test", "time", "times", "touch",
+    "tput", "tr", "trap", "tsort", "tty", "type", "ulimit", "umask",
+    "unalias", "uname", "uncompress", "unexpand", "unget", "uniq",
+    "unlink", "unset", "uucp", "uudecode", "uuencode", "uustat", "uux",
+    "val", "vi", "wait", "wc", "what", "who", "write", "xargs", "yacc",
+    "zcat"
+  ]
+
+sampleWords = [
+    "alpha", "bravo", "charlie", "delta", "echo", "foxtrot",
+    "golf", "hotel", "india", "juliett", "kilo", "lima", "mike",
+    "november", "oscar", "papa", "quebec", "romeo", "sierra",
+    "tango", "uniform", "victor", "whiskey", "xray", "yankee",
+    "zulu"
+  ]

ShellCheck/Options.hs

@@ -0,0 +1,14 @@
+module ShellCheck.Options where
+
+data Shell = Ksh | Sh | Bash
+    deriving (Show, Eq)
+
+data AnalysisOptions = AnalysisOptions {
+    optionShellType :: Maybe Shell,
+    optionExcludes :: [Integer]
+}
+
+defaultAnalysisOptions = AnalysisOptions {
+    optionShellType = Nothing,
+    optionExcludes = []
+}

ShellCheck/Simple.hs

@@ -0,0 +1,80 @@
+{-
+    This file is part of ShellCheck.
+    http://www.vidarholen.net/contents/shellcheck
+
+    ShellCheck is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    ShellCheck is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+-}
+{-# LANGUAGE TemplateHaskell #-}
+module ShellCheck.Simple (shellCheck, ShellCheckComment, scLine, scColumn, scSeverity, scCode, scMessage, runTests) where
+
+import Data.List
+import Data.Maybe
+import ShellCheck.Analytics hiding (runTests)
+import ShellCheck.Options
+import ShellCheck.Parser hiding (runTests)
+import Test.QuickCheck.All (quickCheckAll)
+import Text.Parsec.Pos
+
+shellCheck :: AnalysisOptions -> String -> [ShellCheckComment]
+shellCheck options script =
+    let (ParseResult result notes) = parseShell options "-" script in
+        let allNotes = notes ++ concat (maybeToList $ do
+            (tree, posMap) <- result
+            let list = runAnalytics options tree
+            return $ map (noteToParseNote posMap) $ filterByAnnotation tree list
+            )
+        in
+            map formatNote $ nub $ sortNotes allNotes
+
+data ShellCheckComment = ShellCheckComment { scLine :: Int, scColumn :: Int, scSeverity :: String, scCode :: Int, scMessage :: String }
+
+instance Show ShellCheckComment where
+    show c = concat ["(", show $ scLine c, ",", show $ scColumn c, ") ", scSeverity c, ": ", show (scCode c), " ", scMessage c]
+
+severityToString s =
+    case s of
+        ErrorC -> "error"
+        WarningC -> "warning"
+        InfoC -> "info"
+        StyleC -> "style"
+
+formatNote (ParseNote pos severity code text) =
+    ShellCheckComment (sourceLine pos) (sourceColumn pos) (severityToString severity) (fromIntegral code) text
+
+testCheck = shellCheck defaultAnalysisOptions { optionExcludes = [2148] } -- Ignore #! warnings
+prop_findsParseIssue =
+    let comments = testCheck "echo \"$12\"" in
+        length comments == 1 && scCode (head comments) == 1037
+prop_commentDisablesParseIssue1 =
+    null $ testCheck "#shellcheck disable=SC1037\necho \"$12\""
+prop_commentDisablesParseIssue2 =
+    null $ testCheck "#shellcheck disable=SC1037\n#lol\necho \"$12\""
+
+prop_findsAnalysisIssue =
+    let comments = testCheck "echo $1" in
+        length comments == 1 && scCode (head comments) == 2086
+prop_commentDisablesAnalysisIssue1 =
+    null $ testCheck "#shellcheck disable=SC2086\necho $1"
+prop_commentDisablesAnalysisIssue2 =
+    null $ testCheck "#shellcheck disable=SC2086\n#lol\necho $1"
+
+prop_optionDisablesIssue1 =
+    null $ shellCheck (defaultAnalysisOptions { optionExcludes = [2086, 2148] }) "echo $1"
+
+prop_optionDisablesIssue2 =
+    null $ shellCheck (defaultAnalysisOptions { optionExcludes = [2148, 1037] }) "echo \"$10\""
+
+return []
+runTests = $quickCheckAll
+

shellcheck.1.md

@@ -0,0 +1,148 @@
+% SHELLCHECK(1) Shell script analysis tool
+
+# NAME
+
+shellcheck - Shell script analysis tool
+
+# SYNOPSIS
+
+**shellcheck** [*OPTIONS*...] *FILES*...
+
+# DESCRIPTION
+
+ShellCheck is a static analysis and linting tool for sh/bash scripts. It's
+mainly focused on handling typical beginner and intermediate level syntax
+errors and pitfalls where the shell just gives a cryptic error message or
+strange behavior, but it also reports on a few more advanced issues where
+corner cases can cause delayed failures.
+
+ShellCheck gives shell specific advice. Consider the line:
+
+    (( area = 3.14*r*r ))
+
++ For scripts starting with `#!/bin/sh` (or when using `-s sh`), ShellCheck
+will warn that `(( .. ))` is not POSIX compliant (similar to checkbashisms).
+
++ For scripts starting with `#!/bin/bash` (or using `-s bash`), ShellCheck
+will warn that decimals are not supported.
+
++ For scripts starting with `#!/bin/ksh` (or using `-s ksh`), ShellCheck will
+not warn at all, as `ksh` supports decimals in arithmetic contexts.
+
+
+# OPTIONS
+
+**-e**\ *CODE1*[,*CODE2*...],\ **--exclude=***CODE1*[,*CODE2*...]
+
+:   Explicitly exclude the specified codes from the report. Subsequent **-e**
+    options are cumulative, but all the codes can be specified at once,
+    comma-separated as a single argument.
+
+**-f** *FORMAT*, **--format=***FORMAT*
+
+:   Specify the output format of shellcheck, which prints its results in the
+    standard output. Subsequent **-f** options are ignored, see **FORMATS**
+    below for more information.
+
+**-s**\ *shell*,\ **--shell=***shell*
+
+:   Specify Bourne shell dialect. Valid values are *sh*, *bash* and *ksh*.
+    The default is to use the file's shebang, or *bash* if the target shell
+    can't be determined.
+
+**-V**\ *version*,\ **--version**
+
+:   Print version and exit.
+
+# FORMATS
+
+**tty**
+
+:   Plain text, human readable output. This is the default.
+
+**gcc**
+
+:   GCC compatible output. Useful for editors that support compiling and
+    showing syntax errors.
+
+    For example, in Vim, `:set makeprg=shellcheck\ -f\ gcc\ %` will allow
+    using `:make` to check the script, and `:cnext` to jump to the next error.
+
+        <file>:<line>:<column>: <type>: <message>
+
+**checkstyle**
+
+:   Checkstyle compatible XML output. Supported directly or through plugins
+    by many IDEs and build monitoring systems.
+
+        <?xml version='1.0' encoding='UTF-8'?>
+        <checkstyle version='4.3'>
+          <file name='file'>
+            <error
+              line='line'
+              column='column'
+              severity='severity'
+              message='message'
+              source='ShellCheck.SC####' />
+            ...
+          </file>
+          ...
+        </checkstyle>
+
+**json**
+
+:   Json is a popular serialization format that is more suitable for web
+    applications. ShellCheck's json is compact and contains only the bare
+    minimum.
+
+        [
+          {
+            "file": "filename",
+            "line": lineNumber,
+            "column": columnNumber,
+            "level": "severitylevel",
+            "code": errorCode,
+            "message": "warning message"
+          },
+          ...
+        ]
+
+# DIRECTIVES
+ShellCheck directives can be specified as comments in the shell script
+before a command or block:
+
+    # shellcheck key=value key=value
+    command-or-structure
+
+For example, to suppress SC2035 about using `./*.jpg`:
+
+    # shellcheck disable=SC2035
+    echo "Files: " *.jpg
+
+Here a shell brace group is used to suppress on multiple lines:
+
+    # shellcheck disable=SC2016
+    {
+      echo 'Modifying $PATH'
+      echo 'PATH=foo:$PATH' >> ~/.bashrc
+    }
+
+Valid keys are:
+
+**disable**
+:   Disables a comma separated list of error codes for the following command.
+    The command can be a simple command like `echo foo`, or a compound command
+    like a function definition, subshell block or loop.
+
+
+# AUTHOR
+ShellCheck is written and maintained by Vidar Holen.
+
+# REPORTING BUGS
+Bugs and issues can be reported on GitHub:
+
+https://github.com/koalaman/shellcheck/issues
+
+# SEE ALSO
+
+sh(1) bash(1)

shellcheck.hs

@@ -0,0 +1,354 @@
+{-
+    This file is part of ShellCheck.
+    http://www.vidarholen.net/contents/shellcheck
+
+    ShellCheck is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    ShellCheck is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+-}
+import Control.Exception
+import Control.Monad
+import Control.Monad.Trans
+import Control.Monad.Trans.Error
+import Control.Monad.Trans.List
+import Data.Char
+import Data.Maybe
+import Data.Monoid
+import GHC.Exts
+import GHC.IO.Device
+import Prelude hiding (catch)
+import ShellCheck.Data
+import ShellCheck.Options
+import ShellCheck.Simple
+import ShellCheck.Analytics
+import System.Console.GetOpt
+import System.Directory
+import System.Environment
+import System.Exit
+import System.IO
+import Text.JSON
+import qualified Data.Map as Map
+
+data Flag = Flag String String
+data Status = NoProblems | SomeProblems | BadInput | SupportFailure | SyntaxFailure | RuntimeException deriving (Ord, Eq)
+
+data JsonComment = JsonComment FilePath ShellCheckComment
+
+instance Error Status where
+    noMsg = RuntimeException
+
+instance Monoid Status where
+    mempty = NoProblems
+    mappend = max
+
+header = "Usage: shellcheck [OPTIONS...] FILES..."
+options = [
+    Option "e" ["exclude"]
+        (ReqArg (Flag "exclude") "CODE1,CODE2..") "exclude types of warnings",
+    Option "f" ["format"]
+        (ReqArg (Flag "format") "FORMAT") "output format",
+    Option "s" ["shell"]
+        (ReqArg (Flag "shell") "SHELLNAME") "Specify dialect (bash,sh,ksh)",
+    Option "V" ["version"]
+        (NoArg $ Flag "version" "true") "Print version information"
+    ]
+
+printErr = hPutStrLn stderr
+
+
+instance JSON (JsonComment) where
+  showJSON (JsonComment filename c) = makeObj [
+      ("file", showJSON $ filename),
+      ("line", showJSON $ scLine c),
+      ("column", showJSON $ scColumn c),
+      ("level", showJSON $ scSeverity c),
+      ("code", showJSON $ scCode c),
+      ("message", showJSON $ scMessage c)
+      ]
+  readJSON = undefined
+
+parseArguments :: [String] -> ErrorT Status IO ([Flag], [FilePath])
+parseArguments argv =
+    case getOpt Permute options argv of
+        (opts, files, []) -> return (opts, files)
+        (_, _, errors) -> do
+            liftIO . printErr $ concat errors ++ "\n" ++ usageInfo header options
+            throwError SyntaxFailure
+
+formats :: Map.Map String (AnalysisOptions -> [FilePath] -> IO Status)
+formats = Map.fromList [
+    ("json", forJson),
+    ("gcc", forGcc),
+    ("checkstyle", forCheckstyle),
+    ("tty", forTty)
+    ]
+
+toStatus = liftM (either id (const NoProblems)) . runErrorT
+
+catchExceptions :: IO Status -> IO Status
+catchExceptions action = action -- action `catch` handler
+  where
+    handler err = do
+        printErr $ show (err :: SomeException)
+        return RuntimeException
+
+checkComments comments = if null comments then NoProblems else SomeProblems
+
+forTty :: AnalysisOptions -> [FilePath] -> IO Status
+forTty options files = do
+    output <- mapM doFile files
+    return $ mconcat output
+  where
+    clear = ansi 0
+    ansi n = "\x1B[" ++ show n ++ "m"
+
+    colorForLevel "error" = 31 -- red
+    colorForLevel "warning" = 33 -- yellow
+    colorForLevel "info" = 32 -- green
+    colorForLevel "style" = 32 -- green
+    colorForLevel "message" = 1 -- bold
+    colorForLevel "source" = 0 -- none
+    colorForLevel _ = 0 -- none
+
+    colorComment level comment =
+        ansi (colorForLevel level) ++ comment ++ clear
+
+    doFile path = catchExceptions $ do
+        contents <- readContents path
+        doInput path contents
+
+    doInput filename contents = do
+        let fileLines = lines contents
+        let lineCount = length fileLines
+        let comments = getComments options contents
+        let groups = groupWith scLine comments
+        colorFunc <- getColorFunc
+        mapM_ (\x -> do
+            let lineNum = scLine (head x)
+            let line = if lineNum < 1 || lineNum > lineCount
+                            then ""
+                            else fileLines !! (lineNum - 1)
+            putStrLn ""
+            putStrLn $ colorFunc "message"
+                ("In " ++ filename ++" line " ++ show lineNum ++ ":")
+            putStrLn (colorFunc "source" line)
+            mapM_ (\c -> putStrLn (colorFunc (scSeverity c) $ cuteIndent c)) x
+            putStrLn ""
+          ) groups
+        return . checkComments $ comments
+
+    cuteIndent comment =
+        replicate (scColumn comment - 1) ' ' ++
+            "^-- " ++ code (scCode comment) ++ ": " ++ scMessage comment
+
+    code code = "SC" ++ show code
+
+    getColorFunc = do
+        term <- hIsTerminalDevice stdout
+        return $ if term then colorComment else const id
+
+forJson :: AnalysisOptions -> [FilePath] -> IO Status
+forJson options files = catchExceptions $ do
+    comments <- runListT $ do
+        file <- ListT $ return files
+        comment <- ListT $ commentsFor options file
+        return $ JsonComment file comment
+    putStrLn $ encodeStrict comments
+    return $ checkComments comments
+
+-- Mimic GCC "file:line:col: (error|warning|note): message" format
+forGcc :: AnalysisOptions -> [FilePath] -> IO Status
+forGcc options files = do
+    files <- mapM process files
+    return $ mconcat files
+  where
+    process file = catchExceptions $ do
+        contents <- readContents file
+        let comments = makeNonVirtual (getComments options contents) contents
+        mapM_ (putStrLn . format file) comments
+        return $ checkComments comments
+
+    format filename c = concat [
+            filename, ":",
+            show $ scLine c, ":",
+            show $ scColumn c, ": ",
+            case scSeverity c of
+                "error" -> "error"
+                "warning" -> "warning"
+                _ -> "note",
+            ": ",
+            concat . lines $ scMessage c,
+            " [SC", show $ scCode c, "]"
+      ]
+
+-- Checkstyle compatible output. A bit of a hack to avoid XML dependencies
+forCheckstyle :: AnalysisOptions -> [FilePath] -> IO Status
+forCheckstyle options files = do
+    putStrLn "<?xml version='1.0' encoding='UTF-8'?>"
+    putStrLn "<checkstyle version='4.3'>"
+    statuses <- mapM process files
+    putStrLn "</checkstyle>"
+    return $ mconcat statuses
+  where
+    process file = catchExceptions $ do
+        comments <- commentsFor options file
+        putStrLn (formatFile file comments)
+        return $ checkComments comments
+
+    severity "error" = "error"
+    severity "warning" = "warning"
+    severity _ = "info"
+    attr s v = concat [ s, "='", escape v, "' " ]
+    escape = concatMap escape'
+    escape' c = if isOk c then [c] else "&#" ++ show (ord c) ++ ";"
+    isOk x = any ($x) [isAsciiUpper, isAsciiLower, isDigit, (`elem` " ./")]
+
+    formatFile name comments = concat [
+        "<file ", attr "name" name, ">\n",
+            concatMap format comments,
+        "</file>"
+        ]
+
+    format c = concat [
+        "<error ",
+        attr "line" $ show . scLine $ c,
+        attr "column" $ show . scColumn $ c,
+        attr "severity" $ severity . scSeverity $ c,
+        attr "message" $ scMessage c,
+        attr "source" $ "ShellCheck.SC" ++ show (scCode c),
+        "/>\n"
+        ]
+
+commentsFor options file = liftM (getComments options) $ readContents file
+
+getComments = shellCheck
+
+readContents :: FilePath -> IO String
+readContents file =
+    if file == "-"
+    then getContents
+    else readFile file
+
+-- Realign comments from a tabstop of 8 to 1
+makeNonVirtual comments contents =
+    map fix comments
+  where
+    ls = lines contents
+    fix c = c {
+        scColumn =
+            if scLine c > 0 && scLine c <= length ls
+            then real (ls !! (scLine c - 1)) 0 0 (scColumn c)
+            else scColumn c
+    }
+    real _ r v target | target <= v = r
+    real [] r v _ = r -- should never happen
+    real ('\t':rest) r v target =
+        real rest (r+1) (v + 8 - (v `mod` 8)) target
+    real (_:rest) r v target = real rest (r+1) (v+1) target
+
+getOption [] _ = Nothing
+getOption (Flag var val:_) name | name == var = return val
+getOption (_:rest) flag = getOption rest flag
+
+getOptions options name =
+    map (\(Flag _ val) -> val) . filter (\(Flag var _) -> var == name) $ options
+
+split char str =
+    split' str []
+  where
+    split' (a:rest) element =
+        if a == char
+        then reverse element : split' rest []
+        else split' rest (a:element)
+    split' [] element = [reverse element]
+
+getExclusions options =
+    let elements = concatMap (split ',') $ getOptions options "exclude"
+        clean = dropWhile (not . isDigit)
+    in
+        map (Prelude.read . clean) elements :: [Int]
+
+excludeCodes codes =
+    filter (not . hasCode)
+  where
+    hasCode c = scCode c `elem` codes
+
+main = do
+    args <- getArgs
+    status <- toStatus $ do
+        (flags, files) <- parseArguments args
+        process flags files
+    exitWith $ statusToCode status
+
+statusToCode status =
+    case status of
+        NoProblems -> ExitSuccess
+        SomeProblems -> ExitFailure 1
+        BadInput -> ExitFailure 5
+        SyntaxFailure -> ExitFailure 3
+        SupportFailure -> ExitFailure 4
+        RuntimeException -> ExitFailure 2
+
+process :: [Flag] -> [FilePath] -> ErrorT Status IO ()
+process flags files = do
+    options <- foldM (flip parseOption) defaultAnalysisOptions flags
+    verifyFiles files
+    let format = fromMaybe "tty" $ getOption flags "format"
+    case Map.lookup format formats of
+        Nothing -> do
+            liftIO $ do
+                printErr $ "Unknown format " ++ format
+                printErr "Supported formats:"
+                mapM_ (printErr . write) $ Map.keys formats
+            throwError SupportFailure
+          where write s = "  " ++ s
+        Just f -> ErrorT $ liftM Left $ f options files
+
+parseOption flag options =
+    case flag of
+        Flag "shell" str ->
+                fromMaybe (die $ "Unknown shell: " ++ str) $ do
+                    shell <- shellForExecutable str
+                    return $ return options { optionShellType = Just shell }
+
+        Flag "exclude" str -> do
+            new <- mapM parseNum $ split ',' str
+            let old = optionExcludes options
+            return options { optionExcludes = new ++ old }
+
+        Flag "version" _ -> do
+            liftIO printVersion
+            throwError NoProblems
+
+        _ -> return options
+  where
+    die s = do
+        liftIO $ printErr s
+        throwError SupportFailure
+    parseNum ('S':'C':str) = parseNum str
+    parseNum num = do
+        unless (all isDigit num) $ do
+            liftIO . printErr $ "Bad exclusion: " ++ num
+            throwError SyntaxFailure
+        return (Prelude.read num :: Integer)
+
+verifyFiles files =
+    when (null files) $ do
+        liftIO $ printErr "No files specified.\n"
+        liftIO $ printErr $ usageInfo header options
+        throwError SyntaxFailure
+
+printVersion = do
+    putStrLn   "ShellCheck - shell script analysis tool"
+    putStrLn $ "version: " ++ shellcheckVersion
+    putStrLn   "license: GNU Affero General Public License, version 3"
+    putStrLn   "website: http://www.shellcheck.net"

shpell.hs

@@ -1,934 +0,0 @@
-{-# LANGUAGE NoMonomorphismRestriction #-}
-
--- Shpell Check, by Vidar 'koala_man' Holen
--- Sorry about the code. It was a week's worth of hacking.
-
-import Text.Parsec
-import Text.Parsec.Pos (initialPos)
-import Debug.Trace
-import Control.Monad
-import Data.Char
-import Data.List (isInfixOf, partition, sortBy, intercalate)
-import qualified Control.Monad.State as Ms
-import Data.Maybe
-import Prelude hiding (readList)
-import System.IO
-
-
-
-backslash = char '\\'
-linefeed = char '\n'
-singleQuote = char '\''
-doubleQuote = char '"'
-variableStart = upper <|> lower <|> oneOf "_"
-variableChars = upper <|> lower <|> digit <|> oneOf "_"
-specialVariable = oneOf "@*#?-$!"
-tokenDelimiter = oneOf "&|;<> \t\n"
-quotable = oneOf "#|&;<>()$`\\ \"'\t\n"
-doubleQuotable = oneOf "\"$`"
-whitespace = oneOf " \t\n"
-linewhitespace = oneOf " \t"
-
-spacing = do
-    x <- many (many1 linewhitespace <|> (try $ string "\\\n"))
-    optional readComment
-    return $ concat x
-
-allspacing = do
-    spacing
-    x <- option False ((linefeed <|> carriageReturn) >> return True)
-    when x allspacing
-
-carriageReturn = do
-    parseNote ErrorC "Literal carriage return. Run script through tr -d '\\r' "
-    char '\r'
-
-
---------- Message/position annotation on top of user state
-data Annotated a = Annotated SourcePos [Note] a deriving (Show, Eq)
-data Note = ParseNote SourcePos Severity String | Note Severity String deriving (Show, Eq)
-data MessageStack = StackNode Note MessageStack | StackMark String SourcePos MessageStack | StackEmpty
-data ParseProblem = ParseProblem SourcePos Severity String deriving (Show, Eq)
-data OutputNote = OutputNote SourcePos Severity String deriving (Show, Eq)
-data Severity = ErrorC | WarningC | InfoC | StyleC deriving (Show, Eq, Ord)
-
-instance Functor Annotated where
-    fmap f (Annotated p n a) = Annotated p n (f a)
-
-markStack msg = do
-    pos <- getPosition
-    modifyState (StackMark msg pos)
-
-getMessages r (StackMark _ _ s) = (r, s)
-getMessages r (StackNode n s) = getMessages (n:r) s
-popStack = do
-    f <- getState
-    let (notes, stack) = getMessages [] f
-    putState stack
-    return notes
-
--- Store potential parse problems outside of parsec
-parseProblem level msg = do
-    pos <- getPosition
-    parseProblemAt pos level msg
-
-parseProblemAt pos level msg = do
-    Ms.modify ((ParseProblem pos level msg):)
-
-pushNote n = modifyState (StackNode n)
-
-parseNote l a = do
-    pos <- getPosition
-    parseNoteAt pos l a
-
-parseNoteAt pos l a = pushNote $ ParseNote pos l a
-
-
-annotated msg parser = do
-    pos <- getPosition
-    markStack msg
-    result <- parser
-    messages <- popStack
-    return $ Annotated pos messages result
-
-dropAnnotation (Annotated _ _ s) = s
-blankAnnotation pos t = Annotated pos [] t
-
-merge (Annotated pos messages result) = do
-    mapM pushNote messages
-    return result
-
-merging p = p >>= merge
-
-getOutputNotes (Annotated p notes _) = map (makeOutputNote p) notes
-
-makeOutputNote _ (ParseNote p l s) = OutputNote p l s
-makeOutputNote p (Note l s) = OutputNote p l s
-
---------- Convenient combinators
-
-thenSkip main follow = do
-    r <- main
-    optional follow
-    return r
-
-disregard x = x >> return ()
-
-reluctantlyTill p end = do -- parse p until end <|> eof matches ahead
-    (lookAhead ((disregard $ try end) <|> eof) >> return []) <|> do
-        x <- p
-        more <- reluctantlyTill p end
-        return $ x:more
-      <|> return []
-
-reluctantlyTill1 p end = do
-    notFollowedBy end
-    x <- p
-    more <- reluctantlyTill p end
-    return $ x:more
-
-attempting rest branch = do
-    ((try branch) >> rest) <|> rest
-
-wasIncluded p = option False (p >> return True)
-
--- Horrifying AST
-data Token = T_AND_IF | T_OR_IF | T_DSEMI | T_Semi | T_DLESS | T_DGREAT | T_LESSAND | T_GREATAND | T_LESSGREAT | T_DLESSDASH | T_CLOBBER | T_If | T_Then | T_Else | T_Elif | T_Fi | T_Do | T_Done | T_Case | T_Esac | T_While | T_Until | T_For | T_Lbrace | T_Rbrace | T_Lparen | T_Rparen | T_Bang | T_In  | T_NEWLINE | T_EOF | T_Less | T_Greater | T_SingleQuoted String | T_Literal String | T_NormalWord [Annotated Token] | T_DoubleQuoted [Annotated Token] | T_DollarExpansion [Token] | T_DollarBraced String | T_DollarVariable String | T_DollarArithmetic String | T_BraceExpansion String | T_IoFile Token Token | T_HereDoc Bool Bool String | T_HereString Token | T_FdRedirect String Token | T_Assignment String Token | T_Redirecting [Annotated Token] Token | T_SimpleCommand [Annotated Token] [Annotated Token] | T_Pipeline [Annotated Token] | T_Banged Token | T_AndIf (Annotated Token) (Annotated Token) | T_OrIf (Annotated Token) (Annotated Token) | T_Backgrounded Token | T_IfExpression [([Token],[Token])] [Token] | T_Subshell [Token] | T_BraceGroup [Token] | T_WhileExpression [Token] [Token] | T_UntilExpression [Token] [Token] | T_ForIn String [Token] [Token] | T_CaseExpression Token [([Token],[Token])] |T_Function String Token | T_Command (Annotated Token) | T_Script [Token]
-    deriving (Show)
-
-extractNotes' list = modifyFlag ((++) $ concatMap getOutputNotes list) >> return ()
-extractNotes (T_NormalWord list) = extractNotes' list
-extractNotes (T_DoubleQuoted list) = extractNotes' list
-extractNotes (T_Redirecting list f) = extractNotes' list
-extractNotes (T_Pipeline list) = extractNotes' list
-extractNotes (T_Command list) = extractNotes' [list]
-extractNotes (T_SimpleCommand list1 list2) = do
-    extractNotes' list1
-    extractNotes' list2
-extractNotes t = return ()
-
-
-postMessage level s = Ms.modify $ \(x, l) -> (x, Note level s : l)
-warn s = postMessage WarningC s
-inform s = postMessage InfoC s
-style s = postMessage StyleC s
-
-
-putFlag v = modifyFlag (const v) >> return ()
-getFlag = modifyFlag id
-modifyFlag f = do
-    Ms.modify $ \(x, l) -> (f x, l)
-    v <- Ms.get
-    return $ fst v
-
-
-analyzeScopes f i = mapM (analyzeScope f i)
-analyzeScope f i (Annotated pos notes t) = do
-    v <- getFlag
-    let (ret, (flag, list)) = Ms.runState (analyze f i t) (v, [])
-    putFlag flag
-    return $ Annotated pos (notes++list) ret
-
-analyze f i s@(T_NormalWord list) = do
-    f s
-    a <- analyzeScopes f i list
-    return . i $ T_NormalWord a
-
-analyze f i s@(T_DoubleQuoted list) = do
-    f s
-    a <- analyzeScopes f i list
-    return . i $ T_DoubleQuoted a
-
-analyze f i s@(T_DollarExpansion l) = do
-    f s
-    nl <- mapM (analyze f i) l
-    return . i $ T_DollarExpansion nl
-
-analyze f i s@(T_IoFile op file) = do
-    f s
-    a <- analyze f i op
-    b <- analyze f i file
-    return . i $ T_IoFile a b
-
-analyze f i s@(T_HereString word) = do
-    f s
-    a <- analyze f i word
-    return . i $ T_HereString a
-
-analyze f i s@(T_FdRedirect v t) = do
-    f s
-    a <- analyze f i t
-    return . i $ T_FdRedirect v a
-
-analyze f i s@(T_Assignment v t) = do
-    f s
-    a <- analyze f i t
-    return . i $ T_Assignment v a
-
-analyze f i s@(T_Redirecting redirs cmd) = do
-    f s
-    newRedirs <- analyzeScopes f i redirs
-    newCmd <- analyze f i $ cmd
-    return . i $ (T_Redirecting newRedirs newCmd)
-
-analyze f i s@(T_SimpleCommand vars cmds) = do
-    f s
-    a <- analyzeScopes f i vars
-    b <- analyzeScopes f i cmds
-    return . i $ T_SimpleCommand a b
-
-analyze f i s@(T_Pipeline l) = do
-    f s
-    a <- analyzeScopes f i l
-    return . i $ T_Pipeline a
-
-analyze f i s@(T_Banged l) = do
-    f s
-    a <- analyze f i l
-    return . i $ T_Banged a
-
-analyze f i s@(T_AndIf t u) = do
-    f s
-    a <- analyzeScope f i t
-    b <- analyzeScope f i u
-    return . i $ T_AndIf a b
-
-analyze f i s@(T_OrIf t u) = do
-    f s
-    a <- analyzeScope f i t
-    b <- analyzeScope f i u
-    return . i $ T_OrIf a b
-
-analyze f i s@(T_Backgrounded l) = do
-    f s
-    a <- analyze f i l
-    return . i $ T_Backgrounded a
-
-analyze f i s@(T_IfExpression conditions elses) = do
-    f s
-    newConds <- mapM (\(c, t) -> do
-                x <- mapM (analyze f i) c
-                y <- mapM (analyze f i) t
-                return (x, y)
-             ) conditions
-    newElses <- mapM (analyze f i) elses
-    return . i $ T_IfExpression newConds newElses
-
-analyze f i s@(T_Subshell l) = do
-    f s
-    a <- mapM (analyze f i) l
-    return . i $ T_Subshell a
-
-analyze f i s@(T_BraceGroup l) = do
-    f s
-    a <- mapM (analyze f i) l
-    return . i $ T_BraceGroup a
-
-analyze f i s@(T_WhileExpression c l) = do
-    f s
-    a <- mapM (analyze f i) c
-    b <- mapM (analyze f i) l
-    return . i $ T_WhileExpression a b
-
-analyze f i s@(T_UntilExpression c l) = do
-    f s
-    a <- mapM (analyze f i) c
-    b <- mapM (analyze f i) l
-    return . i $ T_UntilExpression a b
-
-analyze f i s@(T_ForIn v w l) = do
-    f s
-    a <- mapM (analyze f i) w
-    b <- mapM (analyze f i) l
-    return . i $ T_ForIn v a b
-
-analyze f i s@(T_CaseExpression word cases) = do
-    f s
-    newWord <- analyze f i word
-    newCases <- mapM (\(c, t) -> do
-                x <- mapM (analyze f i) c
-                y <- mapM (analyze f i) t
-                return (x, y)
-             ) cases
-    return . i $ T_CaseExpression newWord newCases
-
-analyze f i s@(T_Script l) = do
-    f s
-    a <- mapM (analyze f i) l
-    return . i $ T_Script a
-
-analyze f i s@(T_Function name body) = do
-    f s
-    a <- analyze f i body
-    return . i $ T_Function name a
-
-analyze f i s@(T_Command c) = do
-    f s
-    a <- analyzeScope f i c
-    return . i $ T_Command a
-
-analyze f i t = do
-    f t
-    return . i $ t
-
-doAnalysis f t = fst $ Ms.runState (analyze f id t) ((), [])
-explore f d t = fst . snd $ Ms.runState (analyze f id t) (d, [])
-transform i t = fst $ Ms.runState (analyze (const $ return ()) i t) ((), [])
-
-findNotes t = explore extractNotes [] t
-sortNotes l = sortBy compareNotes l
-compareNotes (OutputNote pos1 level1 _) (OutputNote pos2 level2 _) = compare (pos1, level1) (pos2, level2)
-findParseNotes l = map (\(ParseProblem p level s) -> OutputNote p level s) l
---   T_UntilExpression [Token] [Token] | T_ForIn String [Token] [Token]
-
-getNotes s =
-    case rp readScript s of
-        (Right x, p) -> sortNotes $ (findNotes $ doAllAnalysis x) ++ (findParseNotes p)
-        (Left _, p) -> sortNotes $ (OutputNote (initialPos "-") ErrorC "Parsing failed"):(findParseNotes p)
-
-readComment = do
-    char '#'
-    anyChar `reluctantlyTill` linefeed
-
-readNormalWord = do
-    x <- many1 readNormalWordPart
-    return $ T_NormalWord x
-
-readNormalWordPart = readSingleQuoted <|> readDoubleQuoted <|> readDollar <|> readBraced <|> readBackTicked <|> (annotated "normal literal" $ readNormalLiteral)
-
-readSingleQuoted = annotated "single quoted string" $ do
-    singleQuote
-    s <- readSingleQuotedPart `reluctantlyTill` singleQuote
-    singleQuote <?> "End single quoted string"
-
-    let string = concat s
-    return (T_SingleQuoted string) `attempting` do
-        x <- lookAhead anyChar
-        when (isAlpha x && isAlpha (last string)) $ parseProblem WarningC "This apostrophe terminated the single quoted string."
-
-readSingleQuotedLiteral = do
-    singleQuote
-    strs <- many1 readSingleQuotedPart
-    singleQuote
-    return $ concat strs
-
-readSingleQuotedPart =
-    readSingleEscaped
-    <|> anyChar `reluctantlyTill1` (singleQuote <|> backslash)
-
-readBackTicked = annotated "backtick expansion" $ do
-    parseNote StyleC "`..` style expansion is deprecated, use $(..) instead if you want my help"
-    pos <- getPosition
-    char '`'
-    f <- readGenericLiteral (char '`')
-    char '`' `attempting` (eof >> parseProblemAt pos ErrorC "Can't find terminating backtick for this one")
-    return $ T_Literal f
-
-
-readDoubleQuoted = annotated "double quoted string" $ do
-    doubleQuote
-    x <- many doubleQuotedPart
-    doubleQuote <?> "End double quoted"
-    return $ T_DoubleQuoted x
-
-doubleQuotedPart = readDoubleLiteral <|> readDollar <|> readBackTicked
-
-readDoubleQuotedLiteral = do
-    doubleQuote
-    x <- readDoubleLiteral
-    doubleQuote
-    return $ dropAnnotation x
-
-readDoubleLiteral = annotated "double literal" $ do
-    s <- many1 readDoubleLiteralPart
-    return $ T_Literal (concat s)
-
-readDoubleLiteralPart = do
-    x <- (readDoubleEscaped <|> (anyChar >>= \x -> return [x])) `reluctantlyTill1` doubleQuotable
-    return $ concat x
-
-readNormalLiteral = do
-    s <- many1 readNormalLiteralPart
-    return $ T_Literal (concat s)
-
-readNormalLiteralPart = do
-    readNormalEscaped <|> (anyChar `reluctantlyTill1` quotable)
-
-readNormalEscaped = do
-    backslash
-    pos <- getPosition
-    do
-        next <- (quotable <|> oneOf "?*[]")
-        return $ if next == '\n' then "" else [next]
-      <|>
-        do
-            next <- anyChar <?> "No character after \\"
-            parseNoteAt pos WarningC $ "This character doesn't need escaping here, the \\ is ignored"
-            return [next]
-
-readSingleEscaped = do
-    s <- backslash
-    let attempt level p msg = do { try $ parseNote level msg; x <- p; return [s,x]; }
-
-    do {
-        x <- singleQuote;
-        parseProblem InfoC "Are you trying to escape a single quote? echo 'You'\\''re doing it wrong'.";
-        return [s,x];
-    }
-        <|> attempt InfoC linefeed "You don't break lines with \\ in single quotes, it results in literal backslash-linefeed."
-        <|> do
-            x <- anyChar
-            return [s,x]
-
-
-readDoubleEscaped = do
-    bs <- backslash
-    (linefeed >> return "")
-        <|> (doubleQuotable >>= return . return)
-        <|> (anyChar >>= (return . \x -> [bs, x]))
-
-
-readGenericLiteral endExp = do
-    strings <- many (readGenericEscaped <|> anyChar `reluctantlyTill1` endExp)
-    return $ concat strings
-
-readGenericLiteral1 endExp = do
-    strings <- many1 (readGenericEscaped <|> anyChar `reluctantlyTill1` endExp)
-    return $ concat strings
-
-readGenericEscaped = do
-    backslash
-    x <- anyChar
-    return $ if x == '\n' then [] else [x]
-
-readBraced = annotated "{1,2..3} expression" $ try $ do
-    let strip (T_Literal s) = return ("\"" ++ s ++ "\"")
-    char '{'
-    str <- many1 ((readDoubleQuotedLiteral >>= (strip )) <|> readGenericLiteral1 (oneOf "}" <|> whitespace))
-    char '}'
-    return $ T_BraceExpansion $ concat str
-
-readDollar = readDollarArithmetic <|> readDollarBraced <|> readDollarExpansion <|> readDollarVariable <|> readDollarLonely
-
-
-readParenLiteralHack = do
-    strs <- ((anyChar >>= \x -> return [x]) <|> readParenHack) `reluctantlyTill1` (string "))")
-    return $ concat strs
-
-readParenHack = do
-    char '('
-    x <- many anyChar
-    char ')'
-    return $ "(" ++ x ++ ")"
-
-readDollarArithmetic = annotated "$(( )) expression" $ do
-    try (string "$((")
-    -- TODO
-    str <- readParenLiteralHack
-    string "))"
-    return (T_DollarArithmetic str)
-
-readDollarBraced = annotated "${ } expression" $ do
-    try (string "${")
-    -- TODO
-    str <- readGenericLiteral (char '}')
-    char '}' <?> "matching }"
-    return $ (T_DollarBraced str)
-
-readDollarExpansion = annotated "$( )" $ do
-    try (string "$(")
-    cmds <- readCompoundList
-    char ')'
-    return $ (T_DollarExpansion cmds)
-
-readDollarVariable = annotated "$variable" $ do
-    let singleCharred p = do
-        n <- p
-        return (T_DollarVariable [n]) `attempting` do
-            pos <- getPosition
-            num <- lookAhead $ many1 p
-            parseNoteAt pos ErrorC $ "$" ++ (n:num) ++ " is equivalent to ${" ++ [n] ++ "}"++ num
-
-    let positional = singleCharred digit
-    let special = singleCharred specialVariable
-
-    let regular = do
-        name <- readVariableName
-        return $ T_DollarVariable (name)
-
-    char '$'
-    positional <|> special <|> regular
-
-readVariableName = do
-    f <- variableStart
-    rest <- many variableChars
-    return (f:rest)
-
-readDollarLonely = annotated "lonely $" $ do
-    parseNote ErrorC "$ is not used specially and should therefore be escaped"
-    char '$'
-    return $ T_Literal "$"
-
-readHereDoc = annotated "here document" $ do
-    let stripLiteral (T_Literal x) = x
-        stripLiteral (T_SingleQuoted x) = x
-    try $ string "<<"
-    dashed <- (char '-' >> return True) <|> return False
-    tokenPosition <- getPosition
-    spacing
-    (quoted, endToken) <- (readNormalLiteral >>= (\x -> return (False, stripLiteral x)) )
-                            <|> (readDoubleQuotedLiteral >>= return . (\x -> (True, stripLiteral x)))
-                            <|> (readSingleQuotedLiteral >>= return . (\x -> (True, x)))
-    spacing
-
-    hereInfo <- anyChar `reluctantlyTill` (linefeed >> spacing >> (string endToken) >> (disregard whitespace <|> eof))
-
-    do
-        linefeed
-        spaces <- spacing
-        verifyHereDoc dashed quoted spaces hereInfo
-        token <- string endToken
-        return $ T_FdRedirect "" $ T_HereDoc dashed quoted hereInfo
-     `attempting` (eof >> debugHereDoc tokenPosition endToken hereInfo)
-
-verifyHereDoc dashed quoted spacing hereInfo = do
-    when (not dashed && spacing /= "") $ parseNote ErrorC "When using << instead of <<-, the end tokens can't be indented"
-    when (dashed && filter (/= '\t') spacing /= "" ) $ parseNote ErrorC "When using <<-, you can only indent with tabs"
-    return ()
-
-debugHereDoc pos endToken doc =
-    if endToken `isInfixOf` doc
-        then parseProblemAt pos ErrorC (endToken ++ " was part of the here document, but not by itself at the start of the line")
-        else if (map toLower endToken) `isInfixOf` (map toLower doc)
-            then parseProblemAt pos ErrorC (endToken ++ " appears in the here document, but with different case")
-            else parseProblemAt pos ErrorC ("Couldn't find end token `" ++ endToken ++ "' in the here document ")
-
-
-readFilename = readNormalWord
-readIoFileOp = choice [g_LESSAND, g_GREATAND, g_DGREAT, g_LESSGREAT, g_CLOBBER, string "<" >> return T_Less, string ">" >> return T_Greater ]
-readIoFile = do
-    op <- readIoFileOp
-    spacing
-    file <- readFilename
-    return $ T_FdRedirect "" $ T_IoFile op file
-readIoNumber = try $ do
-    x <- many1 digit
-    lookAhead readIoFileOp
-    return x
-readIoNumberRedirect = annotated "fd io redirect" $ do
-    n <- readIoNumber
-    op <- merging readHereString <|> merging readHereDoc <|> readIoFile
-    let actualOp = case op of T_FdRedirect "" x -> x
-    spacing
-    return $ T_FdRedirect n actualOp
-
-readIoRedirect = annotated "io redirect" $ choice [ merging readIoNumberRedirect, merging readHereString, merging readHereDoc, readIoFile ] `thenSkip` spacing
-
-readRedirectList = many1 readIoRedirect
-
-readHereString = annotated "here string" $ do
-    try $ string "<<<"
-    spacing
-    word <- readNormalWord
-    return $ T_FdRedirect "" $ T_HereString word
-
-readNewlineList = many1 ((newline <|> carriageReturn) `thenSkip` spacing)
-readLineBreak = optional readNewlineList
-
-readSeparatorOp = do
-    notFollowedBy (g_AND_IF <|> g_DSEMI)
-    f <- char ';' <|> char '&'
-    spacing
-    return f
-
-readSequentialSep = (disregard $ g_Semi >> readLineBreak) <|> (disregard readNewlineList)
-readSeparator =
-    do
-        separator <- readSeparatorOp
-        readLineBreak
-        return separator
-     <|>
-        do
-            readNewlineList
-            return '\n'
-
-makeSimpleCommand tokens =
-    let (assignment, rest) = partition (\x -> case dropAnnotation x of T_Assignment _ _ -> True; _ -> False) tokens
-    in let (redirections, rest2) = partition (\x -> case dropAnnotation x of T_FdRedirect _ _ -> True; _ -> False) rest
-       in T_Redirecting redirections $ T_SimpleCommand assignment rest2
-
-readSimpleCommand = annotated "simple command" $ do
-    prefix <- option [] readCmdPrefix
-    cmd <- option [] $ do { f <- annotated "command name" readCmdName; return [f]; }
-    when (null prefix && null cmd) $ fail "No command"
-    if null cmd
-        then return $ makeSimpleCommand prefix
-        else do
-            suffix <- option [] readCmdSuffix
-            return $ makeSimpleCommand (prefix ++ cmd ++ suffix)
-
-readPipeline = annotated "Pipeline" $ do
-    notFollowedBy $ try readKeyword
-    do
-        g_Bang `thenSkip` spacing
-        pipe <- readPipeSequence
-        return $ T_Banged pipe
-      <|> do
-        readPipeSequence
-
-readAndOr = (flip (>>=)) (return . T_Command) $ chainr1 readPipeline $ do
-    pos <- getPosition
-    op <- g_AND_IF <|> g_OR_IF
-    readLineBreak
-    return $ \a b ->
-                blankAnnotation pos $
-                     case op of T_AND_IF -> T_AndIf a b
-                                T_OR_IF  -> T_OrIf a b
-
-readTerm = do
-    m <- readAndOr
-    readTerm' m
-
-readTerm' current =
-    do
-        sep <- readSeparator
-        more <- (option T_EOF $ readAndOr)
-        case more of T_EOF -> return [transformWithSeparator sep current]
-                     _     -> do
-                                list <- readTerm' more
-                                return $ (transformWithSeparator sep current : list)
-      <|>
-        return [current]
-
-transformWithSeparator '&' = T_Backgrounded
-transformWithSeparator _  = id
-
-
-readPipeSequence = do
-    list <- readCommand `sepBy1` (readPipe `thenSkip` (spacing >> readLineBreak))
-    spacing
-    return $ T_Pipeline list
-
-readPipe = do
-    notFollowedBy g_OR_IF
-    char '|' `thenSkip` spacing
-
-readCommand = (readCompoundCommand <|> readSimpleCommand)
-
-readCmdName = do
-    f <- readNormalWord
-    spacing
-    return f
-
-readCmdWord = do
-    f <- readNormalWord
-    spacing
-    return f
-
-readIfClause = annotated "if statement" $ do
-    (condition, action) <- readIfPart
-    elifs <- many readElifPart
-    elses <- option [] readElsePart
-    g_Fi
-    return $ T_IfExpression ((condition, action):elifs) elses
-
-readIfPart = do
-    g_If
-    allspacing
-    condition <- readTerm
-    g_Then
-    allspacing
-    action <- readTerm
-    return (condition, action)
-
-readElifPart = do
-    g_Elif
-    allspacing
-    condition <- readTerm
-    g_Then
-    allspacing
-    action <- readTerm
-    return (condition, action)
-
-readElsePart = do
-    g_Else
-    allspacing
-    readTerm
-
-readSubshell = annotated "subshell group" $ do
-    char '('
-    allspacing
-    list <- readCompoundList
-    allspacing
-    char ')'
-    return $ T_Subshell list
-
-readBraceGroup = annotated "brace group" $ do
-    char '{'
-    allspacing
-    list <- readTerm
-    allspacing
-    char '}'
-    return $ T_BraceGroup list
-
-readWhileClause = annotated "while loop" $ do
-    g_While
-    condition <- readTerm
-    statements <- readDoGroup
-    return $ T_WhileExpression condition statements
-
-readUntilClause = annotated "until loop" $ do
-    g_Until
-    condition <- readTerm
-    statements <- readDoGroup
-    return $ T_UntilExpression condition statements
-
-readDoGroup = do
-    pos <- getPosition
-    g_Do
-    allspacing
-    (eof >> return []) <|>
-        do
-            commands <- readCompoundList
-            disregard g_Done <|> eof -- stunted support
-            return commands
-          <|> do
-            parseProblemAt pos ErrorC "Can't find the 'done' for this 'do'"
-            fail "No done"
-
-readForClause = annotated "for loop" $ do
-    g_For
-    spacing
-    name <- readVariableName
-    allspacing
-    values <- readInClause <|> (readSequentialSep >> return [])
-    group <- readDoGroup <|> (allspacing >> eof >> return []) -- stunted support
-    return $ T_ForIn name values group
-
-readInClause = do
-    g_In
-    things <- (readCmdWord) `reluctantlyTill`
-                (disregard (g_Semi) <|> disregard linefeed <|> disregard g_Do)
-
-    do {
-        lookAhead (g_Do);
-        parseNote ErrorC "You need a line feed or semicolon before the 'do' (in Bash)";
-    } <|> do {
-        optional $ g_Semi;
-        disregard allspacing;
-    }
-
-    return things
-
-readCaseClause = annotated "case statement" $ do
-    g_Case
-    word <- readNormalWord
-    spacing
-    g_In
-    readLineBreak
-    list <- readCaseList
-    g_Esac
-    return $ T_CaseExpression word list
-
-readCaseList = many readCaseItem
-
-readCaseItem = do
-    notFollowedBy g_Esac
-    optional g_Lparen
-    spacing
-    pattern <- readPattern
-    g_Rparen
-    readLineBreak
-    list <- ((lookAhead g_DSEMI >> return []) <|> readCompoundList)
-    (g_DSEMI <|> lookAhead (readLineBreak >> g_Esac))
-    readLineBreak
-    return (pattern, list)
-
-readFunctionDefinition = annotated "function definition" $ do
-    name <- try readFunctionSignature
-    allspacing
-    (disregard (lookAhead g_Lbrace) <|> parseProblem ErrorC "Expected a { to open the function definition")
-    group <- merging readBraceGroup
-    return $ T_Function name group
-
-
-readFunctionSignature = do
-    (optional $ try (string "function " >> parseNote StyleC "Don't use 'function' in front of function definitions"))
-    name <- readVariableName
-    spacing
-    g_Lparen
-    g_Rparen
-    return name
-
-
-readPattern = (readNormalWord `thenSkip` spacing) `sepBy1` (char '|' `thenSkip` spacing)
-
-
-readCompoundCommand = annotated "compound command" $ do
-    cmd <- merging $ choice [ readBraceGroup, readSubshell, readWhileClause, readUntilClause, readIfClause, readForClause, readCaseClause, readFunctionDefinition]
-    spacing
-    redirs <- many readIoRedirect
-    return $ T_Redirecting redirs $ cmd
-
-
-readCompoundList = readTerm
-
-readCmdPrefix = many1 (readIoRedirect <|> readAssignmentWord)
-readCmdSuffix = many1 (readIoRedirect <|> annotated "normal word" readCmdWord)
-
-readAssignmentWord = annotated "assignment" $ try $ do
-    optional (char '$' >> parseNote ErrorC "Don't use $ on the left side of assignments")
-    variable <- readVariableName
-    space <- spacing
-    pos <- getPosition
-    char '='
-    space2 <- spacing
-    value <- readNormalWord
-    spacing
-    when (space ++ space2 /= "") $ parseNoteAt pos ErrorC "Don't put spaces around the = in assignments"
-    return $ T_Assignment variable value
-
-
-tryToken s t = try (string s >> spacing >> return t)
-tryWordToken s t = tryParseWordToken (string s) t `thenSkip` spacing
-tryParseWordToken parser t = try (parser >> (lookAhead (eof <|> disregard whitespace))) >> return t
-
-g_AND_IF = tryToken "&&" T_AND_IF
-g_OR_IF = tryToken "||" T_OR_IF
-g_DSEMI = tryToken ";;" T_DSEMI
-g_DLESS = tryToken "<<" T_DLESS
-g_DGREAT = tryToken ">>" T_DGREAT
-g_LESSAND = tryToken "<&" T_LESSAND
-g_GREATAND = tryToken ">&" T_GREATAND
-g_LESSGREAT = tryToken "<>" T_LESSGREAT
-g_DLESSDASH = tryToken "<<-" T_DLESSDASH
-g_CLOBBER = tryToken ">|" T_CLOBBER
-g_OPERATOR = g_AND_IF <|> g_OR_IF <|> g_DSEMI <|> g_DLESSDASH <|> g_DLESS <|> g_DGREAT <|> g_LESSAND <|> g_GREATAND <|> g_LESSGREAT
-
-g_If = tryWordToken "if" T_If
-g_Then = tryWordToken "then" T_Then
-g_Else = tryWordToken "else" T_Else
-g_Elif = tryWordToken "elif" T_Elif
-g_Fi = tryWordToken "fi" T_Fi
-g_Do = tryWordToken "do" T_Do
-g_Done = tryWordToken "done" T_Done
-g_Case = tryWordToken "case" T_Case
-g_Esac = tryWordToken "esac" T_Esac
-g_While = tryWordToken "while" T_While
-g_Until = tryWordToken "until" T_Until
-g_For = tryWordToken "for" T_For
-g_In = tryWordToken "in" T_In
-g_Lbrace = tryWordToken "{" T_Lbrace
-g_Rbrace = tryWordToken "}" T_Rbrace
-
-g_Lparen = tryToken "(" T_Lparen
-g_Rparen = tryToken ")" T_Rparen
-g_Bang = tryToken "!" T_Bang
-
-g_Semi = do
-    notFollowedBy g_DSEMI
-    tryToken ";" T_Semi
-
-readKeyword = choice [ g_Then, g_Else, g_Elif, g_Fi, g_Do, g_Done, g_Esac, g_Rbrace, g_Rparen, g_DSEMI ]
-
-ifParse p t f = do
-    (lookAhead (try p) >> t) <|> f
-
-wtf = do
-    x <- many anyChar
-    parseProblem ErrorC x
-
-readScript = do
-    do {
-        allspacing;
-        commands <- readTerm;
-        eof <|> (parseProblem WarningC "Stopping here, because I can't parse this command");
-        return $ T_Script commands;
-    } <|> do {
-        parseProblem WarningC "Couldn't read any commands";
-        wtf;
-        return T_EOF;
-    }
-
-shpell s = rp readScript s
-rp p s = Ms.runState (runParserT p StackEmpty "-" s) []
-
--------- Destructively simplify AST
-
-simplify (T_Redirecting [] t) = t
-simplify (T_Pipeline [x]) = dropAnnotation x
-simplify (T_NormalWord [x]) = dropAnnotation x
-simplify t = t
-
--------- Analytics
-doAllAnalysis t = foldl (\v f -> doAnalysis f v) t checks
-
-getAst s = case rp readScript s of (Right parsed, _) -> parsed
-getAst2 s = case rp readScript s of (Right parsed, _) -> transform simplify parsed
-lol (Right x, _) = x
-
-deadSimple (T_NormalWord l) = [concat (concatMap (deadSimple . dropAnnotation) l)]
-deadSimple (T_DoubleQuoted l) = ["\"" ++(concat (concatMap (deadSimple . dropAnnotation) l)) ++ "\""]
-deadSimple (T_SingleQuoted s) = [s]
-deadSimple (T_DollarVariable _) = ["${VAR}"]
-deadSimple (T_DollarBraced _) = ["${VAR}"]
-deadSimple (T_DollarArithmetic _) = ["${VAR}"]
-deadSimple (T_DollarExpansion _) = ["${VAR}"]
-deadSimple (T_Literal x) = [x]
-deadSimple (T_SimpleCommand vars words) = concatMap (deadSimple . dropAnnotation) words
-deadSimple (T_Redirecting _ foo) = deadSimple foo
-deadSimple _ = []
-
-
-checks = [checkUuoc]
-checkUuoc (T_Pipeline ((Annotated _ _ x):_:_)) = case (deadSimple x) of ["cat", _] -> style "UUOC: Instead of 'cat a | b', use 'b < a'"
-                                                                        _ -> return ()
-checkUuoc _ = return ()
-
-
-main = do
-    s <- getContents
---    case rp readScript s of (Right parsed, _) -> putStrLn . show $ transform simplify parsed
---                            (Left x, y) -> putStrLn $ "Can't parse: " ++ (show (x,y))
-
-    mapM (putStrLn . show) $ getNotes s

test/shellcheck.hs

@@ -0,0 +1,16 @@
+module Main where
+
+import Control.Monad
+import System.Exit
+import qualified ShellCheck.Simple
+import qualified ShellCheck.Analytics
+import qualified ShellCheck.Parser
+
+main = do
+    putStrLn "Running ShellCheck tests..."
+    results <- sequence [ShellCheck.Simple.runTests,
+                         ShellCheck.Analytics.runTests,
+                         ShellCheck.Parser.runTests]
+    if and results then exitSuccess
+     else exitFailure
+