diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+              GNU GENERAL PUBLIC LICENSE
+                Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+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 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 General Public License for more details.
+
+    You should have received a copy of the GNU 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 the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  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 GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/orgstat.cabal b/orgstat.cabal
new file mode 100644
--- /dev/null
+++ b/orgstat.cabal
@@ -0,0 +1,115 @@
+name:                orgstat
+version:             0.0.1
+synopsis:            Statistics visualizer for org-mode
+license:             GPL-3
+license-file:        LICENSE
+author:              Mikhail Volkhov <volhovm.cs@gmail.com>, Zhenya Vinogradov <zhenyavinogradov@gmail.com>
+maintainer:          volhovm.cs@gmail.com
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     OrgStat.Ast
+                     , OrgStat.Config
+                     , OrgStat.IO
+                     , OrgStat.Logic
+                     , OrgStat.Parser
+                     , OrgStat.Scope
+                     , OrgStat.Report
+                     , OrgStat.Report.Types
+                     , OrgStat.Report.Class
+                     , OrgStat.Report.Timeline
+                     , OrgStat.Util
+                     , OrgStat.WorkMonad
+  build-depends:       aeson >= 0.11.2.0
+                     , attoparsec
+                     , base >=4.9 && <4.10
+                     , bytestring
+                     , colour >= 2.3.3
+                     , containers >= 0.5.7.1
+                     , data-default >= 0.7.1.1
+                     , diagrams-lib
+                     , diagrams-svg
+                     , directory
+                     , exceptions >= 0.8.3
+                     , filepath
+                     , formatting
+                     , hashable >= 1.2.4.0
+                     , lens >= 4.14
+                     , linear
+                     , log-warper >= 0.2.1
+                     , mtl >= 2.2.1
+                     , optparse-simple
+                     , orgmode-parse
+                     , text >= 1.2.2.1
+                     , time >= 1.6.0.1
+                     , turtle >= 1.2.8
+                     , universum >= 0.2.1
+                     , yaml >= 0.8.21.1
+  hs-source-dirs:      src
+  default-language:    Haskell2010
+  ghc-options:         -Wall
+  default-extensions:  GeneralizedNewtypeDeriving
+                       StandaloneDeriving
+                       FlexibleContexts
+                       FlexibleInstances
+                       MultiParamTypeClasses
+                       FunctionalDependencies
+                       NoImplicitPrelude
+                       OverloadedStrings
+                       RecordWildCards
+                       TypeApplications
+                       TupleSections
+                       ViewPatterns
+                       LambdaCase
+                       MultiWayIf
+
+executable orgstat
+  main-is:             Main.hs
+  build-depends:       base >=4.9 && <4.10
+                     , bytestring
+                     , directory
+                     , exceptions >= 0.8.3
+                     , filepath
+                     , formatting
+                     , log-warper >= 0.2.1
+                     , optparse-simple
+                     , orgstat
+                     , universum >= 0.2.1
+  hs-source-dirs:      src/cli
+  default-language:    Haskell2010
+  ghc-options:         -threaded  -Wall -O2 
+  default-extensions:  NoImplicitPrelude
+                       OverloadedStrings
+                       RecordWildCards
+                       TypeApplications
+
+
+test-suite orgstat-test
+  main-is:             Test.hs
+  other-modules:       Spec
+                     , GlobalSpec
+  build-depends:       HUnit >= 1.3.1.2
+                     , QuickCheck
+                     , base >=4.9 && <4.10
+                     , colour >= 2.3.3
+                     , hspec
+                     , orgstat
+                     , lens
+                     , quickcheck-text >= 0.1.2.1
+                     , time >= 1.6.0.1
+                     , text
+                     , transformers
+                     , universum >= 0.2.1
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      test
+  default-language:    Haskell2010
+  ghc-options:         -threaded -rtsopts
+                       -Wall
+                       -fno-warn-orphans
+                       -O2
+  default-extensions:  NoImplicitPrelude
+                       OverloadedStrings
+                       RecordWildCards
+                       TypeApplications
+                       GeneralizedNewtypeDeriving
diff --git a/src/OrgStat/Ast.hs b/src/OrgStat/Ast.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Ast.hs
@@ -0,0 +1,81 @@
+{-# LANGUAGE RankNTypes      #-}
+{-# LANGUAGE TemplateHaskell #-}
+
+-- | Abstract syntax tree for org.
+
+module OrgStat.Ast
+       ( Clock (..)
+       , Org (..)
+       , orgTitle
+       , orgTags
+       , orgClocks
+       , orgSubtrees
+       , fmapOrgLens
+       , traverseTree
+       , atDepth
+       , mergeClocks
+       ) where
+
+import           Control.Lens (ASetter', makeLenses)
+import           Data.Time    (LocalTime, diffUTCTime, localTimeToUTC, utc)
+
+import           Universum
+
+----------------------------------------------------------------------------
+-- Types
+----------------------------------------------------------------------------
+
+-- | Org clock representation -- a pair of time in UTC. Should be
+-- local time in fact, but we'll assume that UTC timestamps support in
+-- org will be added at some point. For now all tags are to be read in
+-- local time.
+data Clock = Clock
+    { cFrom :: LocalTime
+    , cTo   :: LocalTime
+    } deriving (Show,Eq,Ord)
+
+-- | Main datatype of org AST. It may contain some metadata if needed
+-- (e.g. current node depth, children number etc). Content of headers
+-- is ignored.
+data Org = Org
+    { _orgTitle    :: Text
+    , _orgTags     :: [Text]
+    , _orgClocks   :: [Clock]
+    , _orgSubtrees :: [Org]
+    } deriving (Show,Eq)
+
+makeLenses ''Org
+
+----------------------------------------------------------------------------
+-- Helpers and lenses
+----------------------------------------------------------------------------
+
+-- | Functor-like 'fmap' on field chosen by lens.
+fmapOrgLens :: ASetter' Org a -> (a -> a) -> Org -> Org
+fmapOrgLens l f o = o & l %~ f & orgSubtrees %~ map (fmapOrgLens l f)
+
+-- | Traverses node and subnodes, all recursively
+traverseTree :: Traversal' Org Org
+traverseTree f o = o'
+  where
+    o' = liftA2 (\org x -> org & orgSubtrees .~ x) (f o) traversedChildren
+    traversedChildren = traverse (traverseTree f) $ o ^. orgSubtrees
+
+atDepth :: Int -> Traversal' Org Org
+atDepth i _ o | i < 0 = pure o
+atDepth 0 f o = f o
+atDepth n f o =
+    (\x -> o & orgSubtrees .~ x) <$> traverse (atDepth (n-1) f) (o ^. orgSubtrees)
+
+-- | Merges task clocks that have less then 2m delta between them into
+-- one.
+mergeClocks :: Org -> Org
+mergeClocks = fmapOrgLens orgClocks (mergeClocksDo . sort)
+  where
+    toUTC = localTimeToUTC utc
+    mergeClocksDo [] = []
+    mergeClocksDo [x] = [x]
+    mergeClocksDo (a:b:xs)
+        | toUTC (cFrom b) `diffUTCTime ` toUTC (cTo a) < 2*60 =
+          mergeClocksDo $ (Clock (cFrom a) (cTo b)):xs
+        | otherwise = a : mergeClocksDo (b:xs)
diff --git a/src/OrgStat/Config.hs b/src/OrgStat/Config.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Config.hs
@@ -0,0 +1,167 @@
+{-# LANGUAGE RecordWildCards  #-}
+{-# LANGUAGE TemplateHaskell  #-}
+{-# LANGUAGE TypeApplications #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
+
+-- | Configuration file types, together with json instances.
+
+module OrgStat.Config
+       ( ConfigException (..)
+       , ConfDate(..)
+       , ConfRange(..)
+       , ConfReportType(..)
+       , ConfScope (..)
+       , ConfReport (..)
+       , OrgStatConfig (..)
+       ) where
+
+import           Data.Aeson              (FromJSON (..), Value (Object, String), (.!=),
+                                          (.:), (.:?))
+import           Data.Aeson.Types        (typeMismatch)
+import           Data.Default            (def)
+import           Data.List.NonEmpty      (NonEmpty)
+import qualified Data.Text               as T
+import           Data.Time               (LocalTime)
+import           Data.Time.Format        (defaultTimeLocale, parseTimeM)
+import           Universum
+
+import           OrgStat.Report.Timeline (TimelineParams, tpBackground, tpColumnHeight,
+                                          tpColumnWidth, tpLegend, tpTopDay)
+import           OrgStat.Scope           (AstPath (..), ScopeModifier (..))
+import           OrgStat.Util            (parseColour, (??~))
+
+-- | Exception type for everything bad that happens with config,
+-- starting from parsing to logic errors.
+data ConfigException
+    = ConfigParseException Text
+    | ConfigLogicException Text
+    deriving (Show, Typeable)
+
+instance Exception ConfigException
+
+data ConfDate
+    = ConfNow
+    | ConfLocal !LocalTime
+    deriving (Show)
+
+data ConfRange
+    = ConfFromTo !ConfDate !ConfDate
+    | ConfBlockWeek !Integer
+    | ConfBlockDay !Integer
+    | ConfBlockMonth !Integer
+    deriving (Show)
+
+data ConfReportType = Timeline
+    { timelineRange  :: !ConfRange
+    , timelineScope  :: !Text
+    , timelineParams :: !TimelineParams
+    } deriving (Show)
+
+data ConfScope = ConfScope
+    { csName  :: !Text              -- default is "default"
+    , csPaths :: !(NonEmpty FilePath)
+    } deriving (Show)
+
+data ConfReport = ConfReport
+    { crType      :: !ConfReportType -- includes config
+    , crName      :: !Text
+    , crModifiers :: ![ScopeModifier]
+    } deriving (Show)
+
+data OrgStatConfig = OrgStatConfig
+    { confScopes             :: ![ConfScope]
+    , confReports            :: ![ConfReport]
+    , confBaseTimelineParams :: !TimelineParams
+    , confTodoKeywords       :: ![Text]
+    , confOutputDir          :: !FilePath -- default is "./orgstat"
+    , confColorSalt          :: !Int
+    } deriving (Show)
+
+instance FromJSON AstPath where
+    parseJSON (String s) = pure $ AstPath $ filter (not . T.null) $ T.splitOn "/" s
+    parseJSON invalid    = typeMismatch "AstPath" invalid
+
+instance FromJSON ScopeModifier where
+    parseJSON (Object v) = do
+        v .: "type" >>= \case
+            (String "prune") -> ModPruneSubtree <$> v .: "path" <*> v .:? "depth" .!= 0
+            (String "select") -> ModSelectSubtree <$> v .: "path"
+            other -> fail $ "Unsupported scope modifier type: " ++ show other
+    parseJSON invalid    = typeMismatch "ScopeModifier" invalid
+
+instance FromJSON ConfDate where
+    parseJSON (String "now") = pure $ ConfNow
+    parseJSON (String s)     =
+        case parseTimeM True defaultTimeLocale "%Y-%m-%d %H:%M" (T.unpack s) of
+            Nothing -> fail $
+                "Couldn't read date " <> show s <>
+                ". Correct format is 2016-01-01 23:59"
+            Just ut -> pure $ ConfLocal ut
+    parseJSON invalid        = typeMismatch "ConfDate" invalid
+
+instance FromJSON ConfRange where
+    parseJSON (String s) | any (`T.isPrefixOf` s) ["day", "week", "month"] = do
+        let splitted = T.splitOn "-" $ if "-" `T.isInfixOf` s then s else s <> "-"
+            [range, number] = splitted
+            constructor = case range of
+                "day"   -> ConfBlockDay
+                "week"  -> ConfBlockWeek
+                "month" -> ConfBlockMonth
+                _       -> panic "ConfRange@parseJSON"
+            numberParsed
+                | number == "" = pure 0
+                | otherwise = case readMaybe (T.unpack number) of
+                    Nothing -> fail $ "Couldn't parse number modifier of " <> T.unpack s
+                    Just x  -> pure x
+        when (length splitted /= 2) $
+            fail $ "Couldn't parse range " <> T.unpack s <>
+                   ", splitted is " <> show splitted
+        constructor <$> numberParsed
+    parseJSON (Object v)       = ConfFromTo <$> v .: "from" <*> v .: "to"
+    parseJSON invalid          = typeMismatch "ConfRange" invalid
+
+instance FromJSON TimelineParams where
+    parseJSON (Object v) = do
+        legend <- v .:? "legend"
+        topDay <- v .:? "topDay"
+        colWidth <- v .:? "colWidth"
+        colHeight <- v .:? "colHeight"
+        bgColorRaw <- v .:? "background"
+        pure $ def & tpLegend ??~ legend
+                   & tpTopDay ??~ topDay
+                   & tpColumnWidth ??~ colWidth
+                   & tpColumnHeight ??~ colHeight
+                   & tpBackground ??~ (T.strip <$> bgColorRaw >>= parseColour @Text)
+    parseJSON invalid    = typeMismatch "TimelineParams" invalid
+
+instance FromJSON ConfReportType where
+    parseJSON o@(Object v) = do
+        v .: "type" >>= \case
+            (String "timeline") ->
+                Timeline <$> v .: "range"
+                         <*> v .:? "scope" .!= "default"
+                         <*> parseJSON o
+            other -> fail $ "Unsupported scope modifier type: " ++ show other
+    parseJSON invalid    = typeMismatch "ConfReportType" invalid
+
+instance FromJSON ConfScope where
+    parseJSON (Object v) = do
+        ConfScope <$> v .:? "name" .!= "default" <*> v .: "paths"
+    parseJSON invalid    = typeMismatch "ConfScope" invalid
+
+instance FromJSON ConfReport where
+    parseJSON (Object v) = do
+        ConfReport <$> v .: "type"
+                   <*> v .:? "name" .!= "default"
+                   <*> v .:? "modifiers" .!= []
+    parseJSON invalid    = typeMismatch "ConfReport" invalid
+
+instance FromJSON OrgStatConfig where
+    parseJSON (Object v) = do
+        OrgStatConfig <$> v .: "scopes"
+                      <*> v .: "reports"
+                      <*> v .:? "timelineDefault" .!= def
+                      <*> v .:? "todoKeywords" .!= []
+                      <*> v .:? "output" .!= "./orgstat"
+                      <*> v .:? "colorSalt" .!= 0
+    parseJSON invalid    = typeMismatch "ConfReport" invalid
diff --git a/src/OrgStat/IO.hs b/src/OrgStat/IO.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/IO.hs
@@ -0,0 +1,81 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
+-- | Operations with files mostly.
+
+module OrgStat.IO
+       ( readOrgFile
+       , readConfig
+       ) where
+
+import qualified Base             as Base
+import qualified Data.ByteString  as BS
+import qualified Data.Text        as T
+import qualified Data.Text.IO     as TIO
+import           Data.Yaml        (decodeEither)
+import           System.Directory (doesFileExist)
+import           System.FilePath  (takeBaseName, takeExtension)
+import           System.Wlog      (WithLogger, logDebug)
+import           Turtle           (ExitCode (..), procStrict)
+import           Universum
+
+import           OrgStat.Ast      (Org)
+import           OrgStat.Config   (ConfigException (ConfigParseException), OrgStatConfig)
+import           OrgStat.Parser   (runParser)
+import           OrgStat.Util     (dropEnd)
+
+data OrgIOException
+    = OrgIOException Text
+      -- ^ All exceptions related to reading files
+    | ExternalException Text
+      -- ^ Failed to run some external app (gpg)
+    deriving (Typeable)
+
+instance Base.Show OrgIOException where
+    show (OrgIOException r)    = "IOException: " <> T.unpack r
+    show (ExternalException r) = "ExternalException: " <> T.unpack r
+
+instance Exception OrgIOException
+
+-- | Attempts to read a file. If extension is ".gpg", asks a user to
+-- decrypt it first. Returns a pair @(filename, content)@. It also
+-- takes a list of TODO-keywords to take header names correctly.
+readOrgFile
+    :: (MonadIO m, MonadCatch m, WithLogger m)
+    => [Text] -> FilePath -> m (Text, Org)
+readOrgFile todoKeywords fp = do
+    logDebug $ "Reading org file " <> fpt
+    unlessM (liftIO $ doesFileExist fp) $
+        throwM $ OrgIOException $ "Org file " <> fpt <> " doesn't exist"
+    (content, fname) <- case takeExtension fp of
+        ".gpg" -> (,dropEnd 4 fp) <$> decryptGpg
+        ".org" -> (,fp) <$> liftIO (TIO.readFile fp)
+        _ -> throwM $ OrgIOException $
+            "File " <> fpt <> " has unknown extension. Need to be .org or .org.gpg"
+    let filename = T.pack $ takeBaseName fname
+    logDebug $ "Parsing org file " <> fpt
+    parsed <- runParser todoKeywords content
+    pure (filename, parsed)
+  where
+    fpt = T.pack fp
+    failExternal = throwM . ExternalException
+    decryptGpg = do
+        logDebug $ "Decrypting gpg file: " <> fpt
+        (exCode, output) <-
+            (procStrict "gpg" ["--quiet", "--decrypt", fpt] empty)
+            `catch`
+            (\(e :: SomeException) -> failExternal $ "gpg procStrict failed: " <> show e)
+        case exCode of
+            ExitSuccess   -> pass
+            ExitFailure n -> failExternal $ "Gpg failed with code " <> show n
+        pure output
+
+-- | Reads yaml config
+readConfig :: (MonadIO m, MonadThrow m, WithLogger m) => FilePath -> m OrgStatConfig
+readConfig fp = do
+    logDebug $ "Reading config file from: " <> fpt
+    unlessM (liftIO $ doesFileExist fp) $
+        throwM $ OrgIOException $ "Config file " <> fpt <> " doesn't exist"
+    res <- liftIO $ BS.readFile fp
+    either (throwM . ConfigParseException . T.pack) pure $ decodeEither res
+  where
+    fpt = T.pack fp
diff --git a/src/OrgStat/Logic.hs b/src/OrgStat/Logic.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Logic.hs
@@ -0,0 +1,136 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
+-- | Main logic combining all components
+
+module OrgStat.Logic
+       ( convertRange
+       , runOrgStat
+       ) where
+
+import           Data.List                   (notElem, nub, nubBy)
+import qualified Data.List.NonEmpty          as NE
+import qualified Data.Map                    as M
+import qualified Data.Text                   as T
+import           Data.Time                   (LocalTime (..), TimeOfDay (..), addDays,
+                                              defaultTimeLocale, formatTime, getZonedTime,
+                                              toGregorian, zonedTimeToLocalTime)
+import           Data.Time.Calendar          (addGregorianMonthsRollOver)
+import           Data.Time.Calendar.WeekDate (toWeekDate)
+import           System.Directory            (createDirectoryIfMissing)
+import           System.FilePath             ((</>))
+import           System.Wlog                 (logDebug, logInfo)
+import           Universum
+import           Unsafe                      (unsafeHead)
+
+import           OrgStat.Ast                 (Org (..), mergeClocks, orgTitle)
+import           OrgStat.Config              (ConfDate (..), ConfRange (..),
+                                              ConfReport (..), ConfReportType (..),
+                                              ConfScope (..), ConfigException (..),
+                                              OrgStatConfig (..))
+import           OrgStat.IO                  (readConfig, readOrgFile)
+import           OrgStat.Report              (processTimeline, tpColorSalt, writeReport)
+import           OrgStat.Scope               (applyModifiers)
+import           OrgStat.Util                (fromJustM)
+import           OrgStat.WorkMonad           (WorkM, wConfigFile, wXdgOpen)
+import           Turtle                      (shell)
+
+
+-- Converts config range to a pair of 'UTCTime', right bound not inclusive.
+convertRange :: (MonadIO m) => ConfRange -> m (LocalTime, LocalTime)
+convertRange range = case range of
+    (ConfFromTo f t)  -> (,) <$> fromConfDate f <*> fromConfDate t
+    (ConfBlockDay i) | i < 0 -> panic $ "ConfBlockDay i is <0: " <> show i
+    (ConfBlockDay 0) -> (,) <$> (localFromDay <$> startOfDay) <*> curTime
+    (ConfBlockDay i) -> do
+        d <- (negate (i - 1) `addDays`) <$> startOfDay
+        pure $ localFromDayPair ((negate 1) `addDays` d, d)
+    (ConfBlockWeek i) | i < 0 -> panic $ "ConfBlockWeek i is <0: " <> show i
+    (ConfBlockWeek 0) -> (,) <$> (localFromDay <$> startOfWeek) <*> curTime
+    (ConfBlockWeek i) -> do
+        d <- (negate (i - 1) `addWeeks`) <$> startOfWeek
+        pure $ localFromDayPair ((negate 1) `addWeeks` d, d)
+    (ConfBlockMonth i) | i < 0 -> panic $ "ConfBlockMonth i is <0: " <> show i
+    (ConfBlockMonth 0) -> (,) <$> (localFromDay <$> startOfMonth) <*> curTime
+    (ConfBlockMonth i) -> do
+        d <- addGregorianMonthsRollOver (negate $ i-1) <$> startOfMonth
+        pure $ localFromDayPair ((negate 1) `addGregorianMonthsRollOver` d, d)
+  where
+    localFromDay d = LocalTime d $ TimeOfDay 0 0 0
+    localFromDayPair = bimap localFromDay localFromDay
+    curTime = liftIO $ zonedTimeToLocalTime <$> getZonedTime
+    curDay = localDay <$> curTime
+    addWeeks i d = (i*7) `addDays` d
+    startOfDay = curDay
+    startOfWeek = do
+        d <- curDay
+        let weekDay = pred $ view _3 $ toWeekDate d
+        pure $ fromIntegral (negate weekDay) `addDays` d
+    startOfMonth = do
+        d <- curDay
+        let monthDate = pred $ view _3 $ toGregorian d
+        pure $ fromIntegral (negate monthDate) `addDays` d
+    fromConfDate ConfNow       = curTime
+    fromConfDate (ConfLocal x) = pure x
+
+
+runOrgStat :: WorkM ()
+runOrgStat = do
+    conf@OrgStatConfig{..} <- readConfig =<< view wConfigFile
+    logDebug $ "Config: \n" <> show conf
+
+    curTime <- liftIO getZonedTime
+    let reportDir = confOutputDir </> formatTime defaultTimeLocale "%F-%H-%M-%S" curTime
+    liftIO $ createDirectoryIfMissing True reportDir
+    logInfo $ "This report set will be put into: " <> T.pack reportDir
+
+    logInfo $ "Parsing files..."
+    allParsedOrgs <- parseNeededFiles conf
+    forM_ confReports $ \ConfReport{..} -> case crType of
+        Timeline {..} -> do
+            logDebug $ "Processing report " <> crName
+            scope <- getScope conf timelineScope crName
+            let scopeFiles = NE.toList $ csPaths scope
+                neededOrgs =
+                    map (\f -> fromMaybe (panic $ scopeNotFound (T.pack f) crName) $
+                               M.lookup f allParsedOrgs)
+                        scopeFiles
+            let orgTop = Org "/" [] [] $ map (\(fn,o) -> o & orgTitle .~ fn) neededOrgs
+            withModifiers <- mergeClocks <$> applyMods crModifiers orgTop
+            let timelineParamsFinal =
+                    (confBaseTimelineParams <> timelineParams) & tpColorSalt .~ confColorSalt
+            logDebug $ "Launching timeline report with params: " <> show timelineParamsFinal
+            fromto <- convertRange timelineRange
+            logDebug $ "Using range: " <> show fromto
+            res <- processTimeline timelineParamsFinal withModifiers fromto
+            logInfo $ "Generating report " <> crName <> "..."
+            writeReport reportDir (T.unpack crName) res
+    whenM (view wXdgOpen) $ do
+        logInfo "Opening reports using xdg-open..."
+        void $ shell ("for i in $(ls "<>T.pack reportDir<>"/*); do xdg-open $i; done") empty
+  where
+    applyMods mods o = case applyModifiers o mods of
+        Left k  -> throwM k
+        Right r -> pure r
+    scopeNotFound scope report =
+        mconcat ["Scope ", scope, " is requested for config report ",
+                 report, ", but is not present in scopes section"]
+    throwLogic = throwM . ConfigLogicException
+    getScope OrgStatConfig{..} scopeName reportName =
+        fromJustM (throwLogic $ scopeNotFound scopeName reportName) $
+        pure $ find ((== scopeName) . csName) confScopes
+    getScopes (Timeline _ s _) = [s]
+    -- Reads needed org files and returns a map
+    parseNeededFiles :: OrgStatConfig -> WorkM (Map FilePath (Text, Org))
+    parseNeededFiles conf@OrgStatConfig{..} = do
+        let neededScopes =
+                nubBy ((==) `on` snd) $
+                concatMap (\cr -> map (crName cr,) $ getScopes (crType cr)) confReports
+        let availableScopes = map csName confScopes
+        let notAvailableScopes = filter (\(_,s) -> s `notElem` availableScopes) neededScopes
+        unless (null notAvailableScopes) $ do
+            let (r,s) = unsafeHead notAvailableScopes
+            throwLogic $ scopeNotFound s r
+        neededFiles <-
+            nub . concatMap (NE.toList . csPaths) <$>
+            mapM (\(r,s) -> getScope conf s r) neededScopes
+        fmap M.fromList $ forM neededFiles (\f -> (f,) <$> readOrgFile confTodoKeywords f)
diff --git a/src/OrgStat/Parser.hs b/src/OrgStat/Parser.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Parser.hs
@@ -0,0 +1,88 @@
+-- | Org-mode format parsing.
+
+module OrgStat.Parser
+       ( ParsingException (..)
+       , parseOrg
+       , runParser
+       ) where
+
+import           Control.Exception    (Exception)
+import qualified Data.Attoparsec.Text as A
+import qualified Data.OrgMode.Parse   as OP
+import qualified Data.Text            as T
+import           Data.Time            (LocalTime (..), TimeOfDay (..), fromGregorian)
+import           Data.Time.Calendar   ()
+import           Universum
+
+import           OrgStat.Ast          (Clock (..), Org (..))
+
+----------------------------------------------------------------------------
+-- Exceptions
+----------------------------------------------------------------------------
+
+data ParsingException =
+    ParsingException Text
+    deriving (Show, Typeable)
+
+instance Exception ParsingException
+
+----------------------------------------------------------------------------
+-- Parsing
+----------------------------------------------------------------------------
+
+parseOrg :: [Text] -> A.Parser Org
+parseOrg todoKeywords = convertDocument <$> OP.parseDocument todoKeywords
+  where
+    convertDocument :: OP.Document -> Org
+    convertDocument (OP.Document _ headings) = Org
+        { _orgTitle    = ""
+        , _orgTags     = []
+        , _orgClocks   = []
+        , _orgSubtrees = map convertHeading headings
+        }
+
+    convertHeading :: OP.Heading -> Org
+    convertHeading heading = Org
+        { _orgTitle    = OP.title heading
+        , _orgTags     = OP.tags heading
+        , _orgClocks   = getClocks $ OP.section heading
+        , _orgSubtrees = map convertHeading $ OP.subHeadings heading
+        }
+
+    mapEither :: (a -> Either e b) -> ([a] -> [b])
+    mapEither f xs = rights $ map f xs
+
+    getClocks :: OP.Section -> [Clock]
+    getClocks section =
+        mapMaybe convertClock $ concat
+        [ OP.sectionClocks section
+        , mapEither (A.parseOnly OP.parseClock) $
+          lines $
+          OP.sectionParagraph section
+        ]
+
+    -- convert clocks from orgmode-parse format, returns Nothing for clocks
+    -- without end time or time-of-day
+    convertClock :: (Maybe OP.Timestamp, Maybe OP.Duration) -> Maybe Clock
+    convertClock (Just (OP.Timestamp start _active (Just end)), _duration) =
+        Clock <$> convertDateTime start <*> convertDateTime end
+    convertClock _                                                 = Nothing
+
+    -- Nothing for DateTime without time-of-day
+    convertDateTime :: OP.DateTime -> Maybe LocalTime
+    convertDateTime
+        OP.DateTime
+          { yearMonthDay = OP.YMD' (OP.YearMonthDay year month day)
+          , hourMinute = Just (hour, minute)
+          }
+      = Just $ LocalTime
+          (fromGregorian (toInteger year) month day)
+          (TimeOfDay hour minute 0)
+    convertDateTime _ = Nothing
+
+-- Throw parsing exception if it can't be parsed (use Control.Monad.Catch#throwM)
+runParser :: (MonadThrow m) => [Text] -> Text -> m Org
+runParser todoKeywords t =
+    case A.parseOnly (parseOrg todoKeywords) t of
+      Left err  -> throwM $ ParsingException $ T.pack err
+      Right res -> pure res
diff --git a/src/OrgStat/Report.hs b/src/OrgStat/Report.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Report.hs
@@ -0,0 +1,9 @@
+-- | Re-exporting report functionality
+
+module OrgStat.Report
+       ( module Exports
+       ) where
+
+import           OrgStat.Report.Class    as Exports
+import           OrgStat.Report.Timeline as Exports
+import           OrgStat.Report.Types    as Exports
diff --git a/src/OrgStat/Report/Class.hs b/src/OrgStat/Report/Class.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Report/Class.hs
@@ -0,0 +1,23 @@
+-- | Common things among reports
+
+module OrgStat.Report.Class
+       ( Report (..)
+       ) where
+
+import qualified Diagrams.Backend.SVG as DB
+import qualified Diagrams.Prelude     as D
+import           System.FilePath      (replaceExtension, (</>))
+import           Universum
+
+import           OrgStat.Report.Types (SVGImageReport (..))
+
+-- | Things that reporters output an what we can do with them.
+class Report a where
+    -- | Writes report to the disk, given directory and filename.
+    writeReport :: (MonadIO m) => FilePath -> FilePath -> a -> m ()
+
+instance Report SVGImageReport where
+    writeReport dir filename (SVGImage diagram) =
+        liftIO $ DB.renderSVG (replaceExtension (dir </> filename) "svg") size diagram
+      where
+        size = D.dims2D (D.width diagram) (D.height diagram)
diff --git a/src/OrgStat/Report/Timeline.hs b/src/OrgStat/Report/Timeline.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Report/Timeline.hs
@@ -0,0 +1,315 @@
+{-# LANGUAGE RankNTypes          #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TemplateHaskell     #-}
+
+-- | Timeline reporting. Prouces a svg with columns.
+
+module OrgStat.Report.Timeline
+       ( TimelineParams (..)
+       , tpColorSalt
+       , tpLegend
+       , tpTopDay
+       , tpColumnWidth
+       , tpColumnHeight
+       , tpBackground
+
+       , processTimeline
+       ) where
+
+import           Control.Lens         (makeLenses)
+import           Data.Colour.CIE      (luminance)
+import           Data.Default         (Default (..))
+import           Data.List            (lookup, nub)
+import qualified Data.Text            as T
+import           Data.Time            (Day, DiffTime, LocalTime (..), defaultTimeLocale,
+                                       formatTime, timeOfDayToTime)
+import           Diagrams.Backend.SVG (B)
+import qualified Diagrams.Prelude     as D
+import qualified Prelude
+import           Text.Printf          (printf)
+import           Universum
+
+import           OrgStat.Ast          (Clock (..), Org (..))
+import           OrgStat.Report.Types (SVGImageReport (..))
+import           OrgStat.Util         (addLocalTime, hashColour)
+
+
+----------------------------------------------------------------------------
+-- Parameters
+----------------------------------------------------------------------------
+
+data TimelineParams = TimelineParams
+    { _tpColorSalt    :: !Int
+      -- ^ Salt added when getting color out of task name.
+    , _tpLegend       :: !Bool
+      -- ^ Include map legend?
+    , _tpTopDay       :: !Int
+      -- ^ How many items to include in top day (under column)
+    , _tpColumnWidth  :: !Double
+      -- ^ Column width in percent
+    , _tpColumnHeight :: !Double
+      -- ^ Column height
+    , _tpBackground   :: !(D.Colour Double)
+      -- ^ Color of background
+    } deriving (Show)
+
+instance Default TimelineParams where
+    def = TimelineParams 0 True 5 1 1 (D.sRGB24 0xf2 0xf2 0xf2)
+
+makeLenses ''TimelineParams
+
+-- | For all non-default field values of RHS, override LHS with them.
+mergeParams :: TimelineParams -> TimelineParams -> TimelineParams
+mergeParams lhs rhs = mods lhs
+  where
+    mods = foldr1 (.)
+           [ asId tpColorSalt
+           , asId tpLegend
+           , asId tpTopDay
+           , asId tpColumnWidth
+           , asId tpColumnHeight
+           , asId tpBackground ]
+    asId :: forall b. (Eq b) => Lens' TimelineParams b -> TimelineParams -> TimelineParams
+    asId l x =
+        if def ^. l == rhs ^. l
+        then x else x & l .~ (rhs ^. l)
+
+instance Monoid TimelineParams where
+    mempty = def
+    mappend = mergeParams
+
+----------------------------------------------------------------------------
+-- Processing clocks
+----------------------------------------------------------------------------
+
+-- [(a, [b])] -> [(a, b)]
+allClocks :: [(Text, [(DiffTime, DiffTime)])] -> [(Text, (DiffTime, DiffTime))]
+allClocks tasks = do
+  (label, clocks) <- tasks
+  clock <- clocks
+  pure (label, clock)
+
+-- separate list for each day
+selectDays :: [Day] -> [(Text, [Clock])] -> [[(Text, [(DiffTime, DiffTime)])]]
+selectDays days tasks =
+    foreach days $ \day ->
+      filter (not . null . snd) $
+      map (second (selectDay day)) tasks
+  where
+    selectDay :: Day -> [Clock] -> [(DiffTime, DiffTime)]
+    selectDay day clocks = do
+        Clock (LocalTime dFrom tFrom) (LocalTime dTo tTo) <- clocks
+        guard $ any (== day) [dFrom, dTo]
+        let tFrom' = if dFrom == day then timeOfDayToTime tFrom else fromInteger 0
+        let tTo'   = if dTo   == day then timeOfDayToTime tTo   else fromInteger (24*60*60)
+        pure (tFrom', tTo')
+
+-- total time for each task
+totalTimes :: [(Text, [(DiffTime, DiffTime)])] -> [(Text, DiffTime)]
+totalTimes tasks = map (second clocksSum) tasks
+  where
+    clocksSum :: [(DiffTime, DiffTime)] -> DiffTime
+    clocksSum clocks = sum $ map (\(start, end) -> end - start) clocks
+
+-- list of leaves
+orgToList :: Org -> [(Text, [Clock])]
+orgToList = orgToList' ""
+  where
+    orgToList' :: Text -> Org -> [(Text, [Clock])]
+    orgToList' _pr org =
+      --let path = pr <> "/" <> _orgTitle org
+      let path = _orgTitle org
+      in (path, _orgClocks org) : concatMap (orgToList' path) (_orgSubtrees org)
+
+
+----------------------------------------------------------------------------
+-- Drawing
+----------------------------------------------------------------------------
+
+
+diffTimeSeconds :: DiffTime -> Integer
+diffTimeSeconds time = floor $ toRational time
+
+diffTimeMinutes :: DiffTime -> Integer
+diffTimeMinutes time = diffTimeSeconds time `div` 60
+
+-- diffTimeHours :: DiffTime -> Integer
+-- diffTimeHours time = diffTimeMinutes time `div` 60
+
+
+labelColour :: TimelineParams -> Text -> D.Colour Double
+labelColour params _label = hashColour (params ^. tpColorSalt) _label
+
+-- | Returns if the label is to be shown. Second param is font-related
+-- heuristic constant, third is length of interval.
+fitLabelHeight :: TimelineParams -> Double -> Double -> Bool
+fitLabelHeight params n h = h >= (params ^. tpColumnHeight) * n
+
+-- | Decides by <heuristic param n depending on font>, width of column
+-- and string, should it be truncated. And returns modified string.
+fitLabelWidth :: TimelineParams -> Double -> Text -> Text
+fitLabelWidth params n s =
+    if T.length s <= toTake then s else T.take toTake s <> ".."
+  where
+    toTake = floor $ n * ((params ^. tpColumnWidth) ** 1.2)
+
+-- timeline for a single day
+timelineDay :: TimelineParams -> Day -> [(Text, (DiffTime, DiffTime))] -> D.Diagram B
+timelineDay params day clocks =
+    (D.strutY 5 D.===) $
+    (dateLabel D.===) $
+    D.scaleUToY height $
+    (timeticks D.|||) $
+    mconcat
+      [ mconcat (map showClock clocks)
+      , background
+      ]
+  where
+    width = 140 * (totalHeight / height) * (params ^. tpColumnWidth)
+    ticksWidth = 20 * (totalHeight / height)
+    height = 700 * (params ^. tpColumnHeight)
+
+    totalHeight :: Double
+    totalHeight = 24*60
+
+    timeticks :: D.Diagram B
+    timeticks =
+      mconcat $
+      foreach [(0::Int)..23] $ \hour ->
+      mconcat
+        [ D.alignedText 0.5 1 (show hour)
+          & D.font "DejaVu Sans"
+          & D.fontSize 8
+          & D.moveTo (D.p2 (0, -5))
+        , D.rect ticksWidth 1
+          & D.lw D.none
+        ]
+      & D.fc (D.sRGB24 150 150 150)
+      & D.moveTo (D.p2 (0, totalHeight - fromIntegral hour * 60))
+
+    dateLabel :: D.Diagram B
+    dateLabel =
+      mconcat
+      [ D.strutY 20
+      , D.alignedText 0 0.65 (formatTime defaultTimeLocale "%a, %d.%m.%Y" day)
+        & D.font "DejaVu Sans"
+        & D.fontSize 12
+        & D.moveTo (D.p2 (25, 0))
+      ]
+
+    background :: D.Diagram B
+    background =
+      D.rect width totalHeight
+      & D.lw D.none
+      & D.fc (params ^. tpBackground)
+      & D.moveOriginTo (D.p2 (-width/2, totalHeight/2))
+      & D.moveTo (D.p2 (0, totalHeight))
+
+    contrastFrom c = if luminance c < 0.14 then D.sRGB24 224 224 224 else D.black
+
+    showClock :: (Text, (DiffTime, DiffTime)) -> D.Diagram B
+    showClock (label, (start, end)) =
+      let
+        w = width
+        h = fromInteger $ diffTimeMinutes $ end - start
+        bgboxColour = labelColour params label
+        bgbox = D.rect w h
+                & D.lw D.none
+                & D.fc bgboxColour
+        label' = D.alignedText 0 0.5 (T.unpack $ fitLabelWidth params 21 label)
+               & D.font "DejaVu Sans"
+               & D.fontSize 10
+               & D.fc (contrastFrom bgboxColour)
+               & D.moveTo (D.p2 (-w/2+10, 0))
+        box = mconcat $ bool [] [label'] (fitLabelHeight params 14 h) ++ [bgbox]
+      in box & D.moveOriginTo (D.p2 (-w/2, h/2))
+             & D.moveTo (D.p2 (0, totalHeight - fromInteger (diffTimeMinutes start)))
+-- timelines for several days, with top lists
+timelineDays
+  :: TimelineParams
+  -> [Day]
+  -> [[(Text, (DiffTime, DiffTime))]]
+  -> [[(Text, DiffTime)]]
+  -> D.Diagram B
+timelineDays params days clocks topLists =
+    D.hcat $
+    foreach (days `zip` (clocks `zip` topLists)) $ \(day, (dayClocks, topList)) ->
+      D.vsep 5
+      [ timelineDay params day dayClocks
+      , taskList params topList True
+      ]
+
+-- task list, with durations and colours
+taskList :: TimelineParams -> [(Text, DiffTime)] -> Bool -> D.Diagram B
+taskList params labels fit = D.vsep 5 $ map oneTask $ reverse $ sortOn snd labels
+  where
+    oneTask :: (Text, DiffTime) -> D.Diagram B
+    oneTask (label, time) =
+      D.hsep 3
+      [ D.alignedText 1 0.5 (showTime time)
+        & D.font "DejaVu Sans"
+        & D.fontSize 10
+        & D.translateX 30
+      , D.rect 12 12
+        & D.fc (labelColour params label)
+        & D.lw D.none
+      , D.alignedText 0 0.5 (T.unpack $ bool label (fitLabelWidth params 18 label) fit)
+        & D.font "DejaVu Sans"
+        & D.fontSize 10
+      ]
+
+    showTime :: DiffTime -> Prelude.String
+    showTime time = printf "%d:%02d" hours minutes
+      where
+        (hours, minutes) = diffTimeMinutes time `divMod` 60
+
+timelineReport :: TimelineParams -> Org -> (LocalTime, LocalTime) -> SVGImageReport
+timelineReport params org (from,to) = SVGImage pic
+  where
+    lookupDef :: Eq a => b -> a -> [(a, b)] -> b
+    lookupDef d a xs = fromMaybe d $ lookup a xs
+
+    -- period to show. Right border is -1min, we assume it's non-inclusive
+    daysToShow = [localDay from ..
+                  localDay ((negate 120 :: Int) `addLocalTime` to)]
+
+    -- unfiltered leaves
+    tasks :: [(Text, [Clock])]
+    tasks = orgToList org
+
+    -- tasks from the given period, split by days
+    byDay :: [[(Text, [(DiffTime, DiffTime)])]]
+    byDay = selectDays daysToShow tasks
+
+    -- total durations for each task, split by days
+    byDayDurations :: [[(Text, DiffTime)]]
+    byDayDurations = map totalTimes byDay
+
+    -- total durations for the whole period
+    allDaysDurations :: [(Text, DiffTime)]
+    allDaysDurations =
+      let allTasks = nub $ map fst $ concat byDayDurations in
+      foreach allTasks $ \task ->
+      (task,) $ sum $ foreach byDayDurations $ \durations ->
+      lookupDef (fromInteger 0) task durations
+
+    -- split clocks
+    clocks :: [[(Text, (DiffTime, DiffTime))]]
+    clocks = map allClocks byDay
+
+    -- top list for each day
+    topLists :: [[(Text, DiffTime)]]
+    topLists =
+        map (take (params ^. tpTopDay) . reverse . sortOn (\(_task, time) -> time))
+        byDayDurations
+
+    optLegend | params ^. tpLegend = [taskList params allDaysDurations False]
+              | otherwise = []
+
+    pic =
+      D.vsep 30 $ [ timelineDays params daysToShow clocks topLists ] ++ optLegend
+
+processTimeline
+    :: (MonadThrow m)
+    => TimelineParams -> Org -> (LocalTime, LocalTime) -> m SVGImageReport
+processTimeline params org fromto = pure $ timelineReport params org fromto
diff --git a/src/OrgStat/Report/Types.hs b/src/OrgStat/Report/Types.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Report/Types.hs
@@ -0,0 +1,13 @@
+-- | Types common among reports.
+
+module OrgStat.Report.Types
+       ( SVGImageReport (..)
+       ) where
+
+import           Diagrams.Backend.SVG (B)
+import qualified Diagrams.Prelude     as D
+
+-- Also thing to think about is how we output settings (time ranges
+-- etc.) -- on the plot, in the corner, in the file name, as a
+-- description file ?
+data SVGImageReport = SVGImage (D.Diagram B)
diff --git a/src/OrgStat/Scope.hs b/src/OrgStat/Scope.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Scope.hs
@@ -0,0 +1,116 @@
+{-# LANGUAGE DeriveGeneric       #-}
+{-# LANGUAGE RankNTypes          #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TemplateHaskell     #-}
+
+-- | This module defines how report input is formed.
+
+module OrgStat.Scope
+       ( AstPath (..)
+       , isSubPath
+       , existsPath
+       , ScopeModifier (..)
+       , applyModifiers
+       ) where
+
+import qualified Base                 as Base
+import           Control.Lens         (to)
+import           Control.Monad.Except (throwError)
+import qualified Data.Text            as T
+import           Universum
+
+import           OrgStat.Ast          (Org, atDepth, orgClocks, orgSubtrees, orgTitle,
+                                       traverseTree)
+
+-- | Path in org AST is just a list of paths, head ~ closer to tree
+-- root.
+newtype AstPath = AstPath
+    { getAstPath :: [Text]
+    } deriving (Eq, Ord)
+
+instance Base.Show AstPath where
+    show (AstPath path)
+        | null path = "<null_ast_path>"
+        | otherwise = intercalate "/" (map T.unpack path)
+
+isSubPath :: AstPath -> AstPath -> Bool
+isSubPath (AstPath l1) (AstPath l2) = l1 `isPrefixOf` l2
+
+-- | Lens to a org node at path.
+atPath :: AstPath -> Lens' Org (Maybe Org)
+atPath (AstPath []) f o = fromMaybe o <$> f (Just o)
+atPath (AstPath p) f o = atPathDo p o
+  where
+    atPathDo [] org = f Nothing $> org
+    atPathDo (x:xs) org =
+        let match = find ((== x) . view orgTitle) $ org ^. orgSubtrees
+            modified foo = org & orgSubtrees %~ foo . filter ((/= match) . Just)
+            fmapFoo Nothing   = modified identity
+            fmapFoo (Just o') = modified (o' :)
+        in case (xs,match) of
+            (_,Nothing)   -> f Nothing $> org
+            ([],_)        -> fmap fmapFoo $ f match
+            (cont,Just m) -> fmap (\new -> modified (new:)) $ atPathDo cont m
+
+-- | Checks if something is on that path in given 'Org'.
+existsPath :: AstPath -> Org -> Bool
+existsPath p o = o ^. atPath p . to isJust
+
+-- | Modificicators of org tree. They remove some subtrees
+data ScopeModifier
+    = ModPruneSubtree AstPath Int
+      -- ^ Turns all subtrees starting with @path@ and then on depth @d@ into leaves.
+    | ModFilterTag Text
+      -- ^ Given text tag name, it leaves only those subtrees that
+      -- have this tag (tags inherit).
+    | ModSquash AstPath
+      -- ^ Starting at node on path A and depth n, turn A into set of
+      -- nodes A/a1/a2/.../an. Doesn't work/make sense for empty path.
+    | ModSelectSubtree AstPath
+      -- ^ Leaves only node at @path@, deletes all other subtrees.
+    deriving (Show,Eq,Ord)
+
+-- | Errors related to modifiers application
+data ModifierError
+    = MEConflicting ScopeModifier ScopeModifier Text
+    -- ^ Modifiers can't be applied together (del/sel)
+    | MEWrongParam ScopeModifier Text
+    -- ^ Modifier doesn't support this parameter
+    deriving (Show,Typeable)
+
+instance Exception ModifierError
+
+-- | Applies modifier to org tree
+applyModifier :: ScopeModifier -> Org -> Either ModifierError Org
+applyModifier m@(ModPruneSubtree path depth) org = do
+    unless (depth >= 0) $ throwError $ MEWrongParam m "Depth should be >= 0"
+    unless (existsPath path org) $
+        throwError $ MEWrongParam m $ "Path " <> show path <> " doesn't exist"
+    let subclocks o' = o' & orgClocks .~ (concatMap (view orgClocks) $ o' ^.. traverseTree)
+                          & orgSubtrees .~ []
+    let pruneChildren o = o & atDepth depth %~ subclocks
+    pure $ org & atPath path %~ (\x -> maybe x (Just . pruneChildren) x)
+applyModifier m@(ModSelectSubtree path) org = do
+    unless (existsPath path org) $
+        throwError $ MEWrongParam m $ "Path " <> show path <> " doesn't exist"
+    pure $
+        fromMaybe (panic "applyModifier@ModSelectSubtree is broken") $
+        org ^. atPath path
+applyModifier _ org = pure org -- TODO
+
+-- | Generates an org to be processed by report generators from 'Scope'.
+applyModifiers :: Org -> [ScopeModifier] -> Either ModifierError Org
+applyModifiers org s = do
+--    whenList addDelConflicts $ \(m1,m2) ->
+--        throwError $ MEConflicting m1 m2 "Path of first modifier is subpath of second one"
+    foldrM applyModifier org mods
+  where
+--    whenList ls foo = case ls of
+--        []    -> pass
+--        (h:_) -> foo h
+--    addDelConflicts =
+--        let addDelConflict (ModPruneSubtree a _) (ModSelectSubtree b) = a `isSubPath` b
+--            addDelConflict _ _                                        = False
+--        in filter (uncurry addDelConflict) modsPairs
+--    modsPairs = [(a,b) | a <- mods, b <- mods, a < b]
+    mods = sort s
diff --git a/src/OrgStat/Util.hs b/src/OrgStat/Util.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/Util.hs
@@ -0,0 +1,84 @@
+{-# LANGUAGE RankNTypes #-}
+-- | Different utilities
+
+module OrgStat.Util
+       ( dropLowerOptions
+       , dropEnd
+       , addLocalTime
+       , fromJustM
+       , parseColour
+       , hashColour
+       , (??~)
+       ) where
+
+import           Control.Lens     (ASetter, ix)
+import           Data.Aeson.TH    (defaultOptions)
+import           Data.Aeson.Types (Options, fieldLabelModifier)
+import           Data.Char        (isLower, toLower)
+import           Data.Colour      (Colour)
+import           Data.Colour.CIE  (luminance)
+import           Data.Colour.SRGB (RGB (..), sRGB24, toSRGBBounded)
+import           Data.Hashable    (hashWithSalt)
+import           Data.List        (nub)
+import           Data.List        ((!!))
+import           Data.Time        (LocalTime (..), addUTCTime, localTimeToUTC, utc,
+                                   utcToLocalTime)
+import           Universum
+
+-- | JSON/Yaml TH modifier. Each field of type "aoeuKek" turns into
+-- "kek". Placed here because it can't be defined near json TH
+-- deriving (ghc restriction).
+dropLowerOptions :: Options
+dropLowerOptions =
+    defaultOptions
+    { fieldLabelModifier = \x -> (dropWhile isLower x) & ix 0 %~ toLower
+    }
+
+fromJustM :: Monad m => m b -> m (Maybe b) -> m b
+fromJustM e m = maybe e pure =<< m
+
+-- | Drops n items from the end.
+dropEnd :: Int -> [x] -> [x]
+dropEnd n xs = take (length xs - n) xs
+
+-- | Same as 'addUTCTime', but for local
+addLocalTime :: (Integral n) => n -> LocalTime -> LocalTime
+addLocalTime n a =
+    utcToLocalTime utc $ fromIntegral n `addUTCTime` localTimeToUTC utc a
+
+-- | Parses colour from format '#rrggbb' or just 'rrggbb'
+parseColour :: forall s a. (ToString s, Floating a, Ord a) => s -> Maybe (Colour a)
+parseColour (toString -> s) = toColour $ dropWhile (== '#') s
+  where
+    toColour [r1,r2,g1,g2,b1,b2] = do
+        r <- toWord8 r1 r2
+        g <- toWord8 g1 g2
+        b <- toWord8 b1 b2
+        pure $ sRGB24 r g b
+    toColour _                   = Nothing
+    toWord8 a b = readMaybe $ "0x"++[a,b]
+
+-- | Generates a colour given salt and anything hashable. Doesn't return
+-- too dark or too light colors.
+hashColour :: (Hashable a) => Int -> a -> Colour Double
+hashColour salt item = colours !! (hashWithSalt salt item `mod` length colours)
+  where
+    broken = panic "Util#hashColour is broken"
+    range = [-5,0,5]
+    colours = filter (\c -> luminance c < 0.8 && luminance c > 0.06) mutate
+    ac :: Word8 -> Integer -> Word8
+    ac a b = fromIntegral $ (fromIntegral a) + b `mod` 255
+    mutate = nub $ concatMap
+        (\(r,g,b) -> [sRGB24 (r `ac` i) (g `ac` j) (b `ac` k)
+                     | i <- range, j <- range, k <- range])
+        coloursBasic
+    coloursBasic =
+        map (toTriple . fromMaybe broken . parseColour @[Char] @Double) popularColours
+    toTriple c = let RGB{..} = toSRGBBounded c in (channelRed, channelGreen, channelBlue)
+    popularColours :: [[Char]]
+    popularColours = ["00FF00","01FFFE","FFA6FE","FFDB66","006401","010067","95003A","007DB5","FF00F6","FFEEE8","774D00","90FB92","0076FF","D5FF00","FF937E","6A826C","FF029D","FE8900","7A4782","7E2DD2","85A900","FF0056","A42400","00AE7E","683D3B","BDC6FF","263400","BDD393","00B917","9E008E","001544","C28C9F","FF74A3","01D0FF","004754","E56FFE","788231","0E4CA1","91D0CB","BE9970","968AE8","BB8800","43002C","DEFF74","00FFC6","FFE502","620E00","008F9C","98FF52","7544B1","B500FF","00FF78","FF6E41","005F39","6B6882","5FAD4E","A75740","A5FFD2","FFB167","009BFF","E85EBE"];
+
+-- | Maybe setter that does nothing on Nothing.
+(??~) :: ASetter s s a b -> Maybe b -> s -> s
+(??~) _ Nothing  = identity
+(??~) l (Just k) = l .~ k
diff --git a/src/OrgStat/WorkMonad.hs b/src/OrgStat/WorkMonad.hs
new file mode 100644
--- /dev/null
+++ b/src/OrgStat/WorkMonad.hs
@@ -0,0 +1,34 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+-- | Definition for main work scope
+
+module OrgStat.WorkMonad
+       ( WorkScope (..)
+       , wConfigFile
+       , wXdgOpen
+       , WorkM (..)
+       , runWorkM
+       ) where
+
+import           Control.Lens (makeLenses)
+import qualified System.Wlog  as W
+import           Universum
+
+data WorkScope = WorkScope
+    { _wConfigFile :: FilePath
+    , _wXdgOpen    :: Bool
+    }
+
+makeLenses ''WorkScope
+
+newtype WorkM a = WorkM
+    { getWorkM :: ReaderT WorkScope IO a
+    } deriving (Functor, Applicative, Monad, MonadIO, MonadReader WorkScope,
+                W.CanLog, MonadThrow, MonadCatch)
+
+instance W.HasLoggerName WorkM where
+    getLoggerName = pure $ W.LoggerName "OrgStat"
+    modifyLoggerName _ = identity
+
+runWorkM :: MonadIO m => WorkScope -> WorkM a -> m a
+runWorkM scope action = liftIO $ runReaderT (getWorkM action) scope
diff --git a/src/cli/Main.hs b/src/cli/Main.hs
new file mode 100644
--- /dev/null
+++ b/src/cli/Main.hs
@@ -0,0 +1,57 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Main where
+
+import           Control.Monad.Catch        (catch)
+import           Data.Version               (showVersion)
+import           Options.Applicative.Simple (Parser, help, long, metavar, simpleOptions,
+                                             strOption, switch, value)
+import           Paths_orgstat              (version)
+import           System.Directory           (getHomeDirectory)
+import           System.FilePath            ((</>))
+import           System.Wlog                (LoggingFormat (..), logDebug, logError)
+import qualified System.Wlog                as W
+import           Universum
+
+import           OrgStat.Logic              (runOrgStat)
+import           OrgStat.WorkMonad          (WorkScope (..), runWorkM)
+
+data Args = Args
+    { configPath :: !FilePath
+      -- ^ Path to configuration file.
+    , xdgOpen    :: Bool
+      -- ^ Open report types using xdg-open
+    , debug      :: Bool
+      -- ^ Enable debug logging
+    } deriving Show
+
+argsParser :: FilePath -> Parser Args
+argsParser homeDir =
+    Args <$>
+    strOption
+        (long "conf-path" <> metavar "FILEPATH" <> value (homeDir </> ".orgstat.yaml") <>
+        help "Path to the configuration file") <*>
+    switch (long "xdg-open" <> help "Open each report using xdg-open") <*>
+    switch (long "debug" <> help "Enable debug logging")
+
+getNodeOptions :: FilePath -> IO Args
+getNodeOptions homeDir = do
+    (res, ()) <-
+        simpleOptions
+            ("orgstat-" <> showVersion version)
+            "----- OrgStat ------"
+            "Statistic reports visualizer for org-mode"
+            (argsParser homeDir)
+            empty
+    pure res
+
+main :: IO ()
+main = do
+    args@Args{..} <- getNodeOptions =<< getHomeDirectory
+    W.initLoggingWith (LoggingFormat False) (if debug then W.Debug else W.Info)
+    runWorkM (WorkScope configPath xdgOpen) $ do
+        logDebug $ "Just started with options: " <> show args
+        runOrgStat `catch` topHandler
+  where
+    topHandler (e :: SomeException) = do
+        logError $ "Top level error occured: " <> show e
diff --git a/test/GlobalSpec.hs b/test/GlobalSpec.hs
new file mode 100644
--- /dev/null
+++ b/test/GlobalSpec.hs
@@ -0,0 +1,153 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module GlobalSpec (spec) where
+
+import           Control.Lens          (to)
+import           Data.Colour.SRGB      (sRGB24show)
+import qualified Data.Text             as T
+import           Data.Text.Arbitrary   ()
+import           Data.Time             (LocalTime (..), TimeOfDay (..), getZonedTime,
+                                        zonedTimeToLocalTime)
+import           Data.Time.Calendar    (addGregorianMonthsRollOver, fromGregorian)
+import           Test.Hspec            (Spec, describe, runIO)
+import           Test.Hspec.QuickCheck (prop)
+import           Test.QuickCheck       (Arbitrary (arbitrary), Gen, NonNegative (..),
+                                        Positive (..), Small (..), choose, forAll,
+                                        ioProperty, oneof, (.&&.), (===), (==>))
+import           Universum
+import           Unsafe                (unsafeTail)
+
+import           OrgStat.Ast           (Clock (..), Org (..), atDepth, mergeClocks,
+                                        orgClocks)
+import           OrgStat.Config        (ConfDate (..), ConfRange (..))
+import           OrgStat.Logic         (convertRange)
+import           OrgStat.Util          (addLocalTime, parseColour)
+
+
+spec :: Spec
+spec = do
+    astSpec
+    parseColourSpec
+    convertRangeSpec
+
+----------------------------------------------------------------------------
+-- AST
+----------------------------------------------------------------------------
+
+instance Arbitrary LocalTime where
+    arbitrary = do
+        d <- choose (1, 28)
+        m <- choose (1, 12)
+        y <- choose (2015, 2016)
+        todHour <- choose (0, 23)
+        todMin <- choose (0, 59)
+        todSec <- fromIntegral <$> (choose (0, 60) :: Gen Int)
+        return $ LocalTime (fromGregorian y m d) TimeOfDay{..}
+
+instance Arbitrary Clock where
+    arbitrary = do
+        [a,b] <- replicateM 2 arbitrary
+        pure . (uncurry Clock) $ if a < b then (a,b) else (b,a)
+
+genOrgDepth :: Int -> Gen Org
+genOrgDepth n = do
+    childrenN <- choose (1,2)
+    clock <- arbitrary
+    name <- T.take 10 <$> arbitrary
+    children <-
+        if n == 0
+        then pure []
+        else replicateM childrenN (genOrgDepth $ n - 1)
+    pure $ Org name [] [clock] children
+
+instance Arbitrary Org where
+    arbitrary = genOrgDepth 5
+
+newtype OrgWrapper = OrgWrapper Org deriving Show
+
+-- Generates an org file with almost-fitting intervals that should be
+-- merged in one
+contOrg :: Int -> Int -> Gen Org
+contOrg dfrom dto = do
+    (Positive i) <- arbitrary
+    (checkpoints :: [LocalTime]) <- sort <$> replicateM (i+1) arbitrary
+    pairs <- forM (checkpoints `zip` unsafeTail checkpoints) $ \(c,c') -> do
+        delta <- choose (dfrom,dto)
+        pure (c, negate delta `addLocalTime` c')
+    let clocks = map (uncurry Clock) pairs
+    pure $ Org "ShouldHaveOneSubclock" [] clocks []
+
+astSpec :: Spec
+astSpec = do
+    describe "Ast#mergeClocks" $ do
+        prop "merges a set of clocks when needed into one" $
+            forAll (contOrg 0 90) $ \o ->
+            mergeClocks o ^. orgClocks . to length === 1
+        prop "doesn't modify big deltas" $
+            forAll (contOrg 120 240) $ \o -> mergeClocks o === o
+    describe "Ast#lenses" $ do
+        prop "atDepth 0 is always the same" $
+            forAll arbitrary $ \o -> o ^.. atDepth 0 === [o]
+        prop "atDepth i for i-tree is not empty" $
+            forAll arbitrary $ \(Positive (Small i)) ->
+            forAll (genOrgDepth i) $ \o ->
+            i < 10 ==> (o ^.. atDepth i /= [])
+        prop "atDepth (i+1) for i-tree is empty" $
+            forAll arbitrary $ \(Positive (Small i)) ->
+            forAll (genOrgDepth i) $ \o ->
+            i < 10 ==> (o ^.. atDepth (i+1) === [])
+
+----------------------------------------------------------------------------
+-- Ranges
+----------------------------------------------------------------------------
+
+convertRangeSpec :: Spec
+convertRangeSpec = describe "Logic#convertRange" $ do
+    curTime <- runIO $ zonedTimeToLocalTime <$> getZonedTime
+    let subDays a i = (negate i * 60 * 60 * 24) `addLocalTime` a
+    let subWeeks a i = (negate i * 60 * 60 * 24 * 7) `addLocalTime` a
+    let subMonths a i = a { localDay = (negate i) `addGregorianMonthsRollOver` (localDay a) }
+    let inRange c (a,b) = c >= a && c <= b
+    let convert = liftIO . convertRange
+    prop "(now-1h, now) is correctly parsed" $
+        forAll arbitrary $ \(Positive (Small (i :: Integer))) ->
+        let hourAgo = (negate i * 60 * 60) `addLocalTime` curTime
+        in ioProperty (inRange curTime <$> convert (ConfFromTo (ConfLocal hourAgo) ConfNow))
+    prop "Today -N days is exactly in day-N range" $
+        forAll arbitrary $ \(NonNegative (Small i)) ->
+            ioProperty (inRange (subDays curTime i) <$> convert (ConfBlockDay i)) .&&.
+            ioProperty (not . inRange (subDays curTime $ i+1) <$> convert (ConfBlockDay i)) .&&.
+            ioProperty (not . inRange (subDays curTime $ i) <$> convert (ConfBlockDay $ i+1))
+    prop "Today -N weeks is exactly in week-N range" $
+        forAll arbitrary $ \(NonNegative (Small i)) ->
+            ioProperty (inRange (subWeeks curTime i) <$> convert (ConfBlockWeek i)) .&&.
+            ioProperty (not . inRange (subWeeks curTime $ i+1) <$> convert (ConfBlockWeek i)) .&&.
+            ioProperty (not . inRange (subWeeks curTime $ i) <$> convert (ConfBlockWeek $ i+1))
+    prop "Today -N months is excatly in month-N range" $
+        forAll arbitrary $ \(NonNegative (Small i)) ->
+            ioProperty (inRange (subMonths curTime i) <$> convert (ConfBlockMonth i)) .&&.
+            ioProperty (not . inRange (subMonths curTime $ i+1) <$> convert (ConfBlockMonth i)) .&&.
+            ioProperty (not . inRange (subMonths curTime i) <$> convert (ConfBlockMonth $ i+1))
+
+
+----------------------------------------------------------------------------
+-- Utils
+----------------------------------------------------------------------------
+
+newtype ColorWrapper = ColorWrapper Text deriving Show
+
+instance Arbitrary ColorWrapper where
+    arbitrary = do
+        nums <- replicateM 6 $ oneof $ map pure "0123456789abcdef"
+        pref <- oneof $ map pure ["#", mempty]
+        pure $ ColorWrapper $ pref <> T.pack nums
+
+parseColourSpec :: Spec
+parseColourSpec = describe "Util#parseColour" $ do
+    prop "Doesn't fail on correct inputs" $
+        forAll arbitrary $ \(ColorWrapper s) ->
+        let s' = T.unpack $ if "#" `T.isPrefixOf` s then s else "#" <> s
+        in (sRGB24show <$> (parseColour @Text @Double s)) === Just s'
+    prop "Fails on incorrect inputs" $
+        forAll arbitrary $ \s ->
+        length s > 6 ==> (parseColour @Text @Double s) === Nothing
diff --git a/test/Spec.hs b/test/Spec.hs
new file mode 100644
--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,1 @@
+{-# OPTIONS_GHC -F -pgmF hspec-discover -optF --module-name=Spec #-}
diff --git a/test/Test.hs b/test/Test.hs
new file mode 100644
--- /dev/null
+++ b/test/Test.hs
@@ -0,0 +1,6 @@
+import           Spec       (spec)
+import           Test.Hspec (hspec)
+import           Universum
+
+main :: IO ()
+main = hspec spec
