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+
+# Table of Contents
+
+1.  [Changelog for ELynx](#org9916021)
+
+
+<a id="org9916021"></a>
+
+# Changelog for ELynx
+
diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+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 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 <https://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
+<https://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
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,417 @@
+
+
+# The ELynx Suite
+
+Version: 0.0.1.
+Reproducible evolution made easy.
+
+The ELynx Suite is a Haskell library and a tool set for computational biology.
+The goal of the ELynx Suite is reproducible research. Evolutionary sequences and
+phylogenetic trees can be read, viewed, modified and simulated. Exact
+specification of all options is necessary, and nothing is assumed about the data
+(e.g., the type of code). The command line with all arguments is consistently,
+and automatically logged. The work overhead in the beginning usually pays off in
+the end.
+
+The Elynx Suite consists of three library packages and two executables providing
+a range of sub commands.
+
+The library packages are:
+
+-   **elynx-seq:** Handle evolutionary sequences and multi sequence alignments;
+-   **elynx-tree:** Handle phylogenetic trees;
+-   **elynx-tools:** Tools for the provided executables;
+
+The executables are:
+
+-   **SLynx:** Analyze, modify, and simulate evolutionary sequences (FASTA format);
+-   **TLynx:** Analyze, modify, and simulate phylogenetic trees (Newick format).
+
+**ELynx is still under development. We happily receive comments, ideas, feature
+requests, or pull requests!**
+
+
+# Installation
+
+ELynx is written in [Haskell](https://www.haskell.org/) and can be installed with [Stack](https://docs.haskellstack.org/en/stable/README/).
+
+1.  Install Stack with your package manager, or directly from the web
+    page.
+    
+        curl -sSL https://get.haskellstack.org/ | sh
+
+2.  Clone the ELynx repository.
+    
+        git clone clone https://github.com/dschrempf/elynx
+
+3.  Navigate to the newly created `elynx` folder and build the binaries.
+    This will take a while.
+    
+        stack build
+
+4.  Run a binary from within the project directory. For example,
+    
+        stack exec tlynx -- --help
+
+5.  If needed, install the binaries.
+    
+        stack install
+    
+    The binaries are installed into `~/.local/bin/` which has to be added [PATH](https://en.wikipedia.org/wiki/PATH_(variable)).
+    Then, they can be used directly.
+
+
+# SLynx
+
+Handle evolutionary sequences.
+
+    slynx --help
+
+    ELynx Suite version 0.5.1. Developed by Dominik Schrempf. Compiled on September
+    9, 2019, at 10:48 am, UTC.
+    
+    Usage: slynx [-v|--verbosity VALUE] [-o|--output-file-basename NAME] COMMAND
+      Analyze, and simulate multi sequence alignments.
+    
+    Available options:
+      -h,--help                Show this help text
+      -V,--version             Show version
+      -v,--verbosity VALUE     Be verbose; one of: Quiet Warning Info
+                               Debug (default: Info)
+      -o,--output-file-basename NAME
+                               Specify base name of output file
+    
+    Available commands:
+      concatenate              
+      examine                  If data is a multi sequence alignment, additionally
+                               analyze columns.
+      filter-rows              
+      filter-columns           
+      simulate                 
+      sub-sample               Create a given number of multi sequence alignments,
+                               each of which containing a given number of random
+                               sites drawn from the original multi sequence
+                               alignment.
+      translate                
+    
+    File formats:
+      - FASTA
+    
+    Alphabet types:
+      - DNA (nucleotides)
+      - DNAX (nucleotides; including gaps)
+      - DNAI (nucleotides; including gaps, and IUPAC codes)
+      - Protein (amino acids)
+      - ProteinX (amino acids; including gaps)
+      - ProteinS (amino acids; including gaps, and translation stops)
+      - ProteinI (amino acids; including gaps, translation stops, and IUPAC codes)
+    
+    The ELynx Suite.
+    A Haskell library and a tool set for computational biology. The goal of the
+    ELynx Suite is reproducible research. Evolutionary sequences and phylogenetic
+    trees can be read, viewed, modified and simulated. Exact specification of all
+    options is necessary, and nothing is assumed about the data (e.g., the type of
+    code). The command line with all arguments is consistently, and automatically
+    logged. The work overhead in the beginning usually pays off in the end.
+    slynx     Analyze, modify, and simulate evolutionary sequences.
+    tlynx     Analyze, modify, and simulate phylogenetic trees.
+
+
+## Concatenate
+
+Concatenate multi sequence alignments.
+
+    slynx concatenate --help
+
+    Concatenate sequences found in input files.
+    
+    Usage: slynx concatenate (-a|--alphabet NAME) INPUT-FILE
+    
+    Available options:
+      -a,--alphabet NAME       Specify alphabet type NAME
+      INPUT-FILE               Read sequences from INPUT-FILE
+      -h,--help                Show this help text
+
+
+## Examine
+
+Examine sequence with `slynx examine`.
+
+    slynx examine --help
+
+    Examine sequences.
+    
+    Usage: slynx examine (-a|--alphabet NAME) [INPUT-FILE] [--per-site]
+      If data is a multi sequence alignment, additionally analyze columns.
+    
+    Available options:
+      -a,--alphabet NAME       Specify alphabet type NAME
+      INPUT-FILE               Read sequences from INPUT-FILE
+      --per-site               Report per site summary statistics
+      -h,--help                Show this help text
+
+
+## Filter
+
+Filter sequences with `filer-rows`.
+
+    slynx filter-rows --help
+
+    Filter rows (or sequences) found in input files.
+    
+    Usage: slynx filter-rows (-a|--alphabet NAME) [INPUT-FILE]
+                             [--longer-than LENGTH] [--shorter-than LENGTH]
+    
+    Available options:
+      -a,--alphabet NAME       Specify alphabet type NAME
+      INPUT-FILE               Read sequences from INPUT-FILE
+      --longer-than LENGTH     Only keep sequences longer than LENGTH
+      --shorter-than LENGTH    Only keep sequences shorter than LENGTH
+      -h,--help                Show this help text
+
+Filter columns of multi sequence alignments with `filter-columns`.
+
+    slynx filter-columns --help
+
+    Filter columns of multi-sequence alignments.
+    
+    Usage: slynx filter-columns (-a|--alphabet NAME) [INPUT-FILE]
+                                [--standard-chars DOUBLE]
+    
+    Available options:
+      -a,--alphabet NAME       Specify alphabet type NAME
+      INPUT-FILE               Read sequences from INPUT-FILE
+      --standard-chars DOUBLE  Keep columns with a proportion standard (non-IUPAC)
+                               characters larger than DOUBLE in [0,1]
+      -h,--help                Show this help text
+
+
+## Simulate
+
+Simulate sequences with `slynx simulate`.
+
+    slynx simulate --help
+
+    Simulate multi sequence alignments.
+    
+    Usage: slynx simulate (-t|--tree-file Name) [-s|--substitution-model MODEL]
+                          [-m|--mixture-model MODEL] [-e|--edm-file NAME]
+                          [-w|--mixture-model-weights "[DOUBLE,DOUBLE,...]"]
+                          [-g|--gamma-rate-heterogeneity "(NCAT,SHAPE)"]
+                          (-l|--length NUMBER) [-S|--seed [INT]]
+    
+    Available options:
+      -t,--tree-file Name      Read trees from file NAME
+      -s,--substitution-model MODEL
+                               Set the phylogenetic substitution model; available
+                               models are shown below (mutually exclusive with -m
+                               option)
+      -m,--mixture-model MODEL Set the phylogenetic mixture model; available models
+                               are shown below (mutually exclusive with -s option)
+      -e,--edm-file NAME       Empirical distribution model file NAME in Phylobayes
+                               format
+      -w,--mixture-model-weights "[DOUBLE,DOUBLE,...]"
+                               Weights of mixture model components
+      -g,--gamma-rate-heterogeneity "(NCAT,SHAPE)"
+                               Number of gamma rate categories and shape parameter
+      -l,--length NUMBER       Set alignment length to NUMBER
+      -S,--seed [INT]          Seed for random number generator; list of 32 bit
+                               integers with up to 256 elements (default: random)
+      -h,--help                Show this help text
+    
+    Substitution models:
+    -s "MODEL[PARAMETER,PARAMETER,...]{STATIONARY_DISTRIBUTION}"
+       Supported DNA models: JC, HKY.
+         For example,
+           -s HKY[KAPPA]{DOUBLE,DOUBLE,DOUBLE,DOUBLE}
+       Supported Protein models: Poisson, Poisson-Custom, LG, LG-Custom, WAG, WAG-Custom.
+         MODEL-Custom means that only the exchangeabilities of MODEL are used,
+         and a custom stationary distribution is provided.
+         For example,
+           -s LG-Custom{...}
+    
+    Mixture models:
+    -m "MIXTURE(SUBSTITUTION_MODEL_1,SUBSTITUTION_MODEL_2)"
+       For example,
+         -m "MIXTURE(JC,HKY[6.0]{0.3,0.2,0.2,0.3})"
+    Mixture weights have to be provided with the -w option.
+    
+    Special mixture models:
+    -m CXX
+       where XX is 10, 20, 30, 40, 50, or 60; CXX models, Quang et al., 2008.
+    -m "EDM(EXCHANGEABILITIES)"
+       Arbitrary empirical distribution mixture (EDM) models.
+       Stationary distributions have to be provided with the -e option.
+       For example,
+         LG exchangeabilities with stationary distributions given in FILE.
+         -m "EDM(LG-Custom)" -e FILE
+    For special mixture models, mixture weights are optional.
+
+
+## Sub-sample
+
+Sub-sample columns from multi sequence alignments.
+
+    slynx sub-sample --help
+
+    Usage: slynx sub-sample (-a|--alphabet NAME) [INPUT-FILE]
+                            (-n|--number-of-sites INT)
+                            (-m|--number-of-alignments INT) [-S|--seed [INT]]
+      Create a given number of multi sequence alignments, each of which containing a
+      given number of random sites drawn from the original multi sequence alignment.
+    
+    Available options:
+      -a,--alphabet NAME       Specify alphabet type NAME
+      INPUT-FILE               Read sequences from INPUT-FILE
+      -n,--number-of-sites INT Number of sites randomly drawn with replacement
+      -m,--number-of-alignments INT
+                               Number of multi sequence alignments to be created
+      -S,--seed [INT]          Seed for random number generator; list of 32 bit
+                               integers with up to 256 elements (default: random)
+      -h,--help                Show this help text
+
+
+## Translate
+
+Translate sequences.
+
+    slynx translate --help
+
+    Translate from DNA to Protein or DNAX to ProteinX.
+    
+    Usage: slynx translate (-a|--alphabet NAME) [INPUT-FILE]
+                           (-r|--reading-frame INT) (-u|--universal-code CODE)
+    
+    Available options:
+      -a,--alphabet NAME       Specify alphabet type NAME
+      INPUT-FILE               Read sequences from INPUT-FILE
+      -r,--reading-frame INT   Reading frame [0|1|2].
+      -u,--universal-code CODE universal code; one of: Standard,
+                               VertebrateMitochondrial.
+      -h,--help                Show this help text
+
+
+# TLynx
+
+Handle phylogenetic trees in Newick format.
+
+    tlynx --help
+
+    ELynx Suite version 0.5.1. Developed by Dominik Schrempf. Compiled on September
+    9, 2019, at 10:48 am, UTC.
+    
+    Usage: tlynx [-v|--verbosity VALUE] [-o|--output-file-basename NAME] COMMAND
+      Compare, examine, and simulate phylogenetic trees.
+    
+    Available options:
+      -h,--help                Show this help text
+      -V,--version             Show version
+      -v,--verbosity VALUE     Be verbose; one of: Quiet Warning Info
+                               Debug (default: Info)
+      -o,--output-file-basename NAME
+                               Specify base name of output file
+    
+    Available commands:
+      compare                  
+      examine                  
+      simulate                 Simulate reconstructed trees using the point process.
+                               See Gernhard, T. (2008). The conditioned
+                               reconstructed process. Journal of Theoretical
+                               Biology, 253(4), 769–778.
+                               http://doi.org/10.1016/j.jtbi.2008.04.005
+    
+    File formats:
+      - Newick
+    
+    The ELynx Suite.
+    A Haskell library and a tool set for computational biology. The goal of the
+    ELynx Suite is reproducible research. Evolutionary sequences and phylogenetic
+    trees can be read, viewed, modified and simulated. Exact specification of all
+    options is necessary, and nothing is assumed about the data (e.g., the type of
+    code). The command line with all arguments is consistently, and automatically
+    logged. The work overhead in the beginning usually pays off in the end.
+    slynx     Analyze, modify, and simulate evolutionary sequences.
+    tlynx     Analyze, modify, and simulate phylogenetic trees.
+
+
+## Compare
+
+Compute distances between phylogenetic trees.
+
+    tlynx compare --help
+
+    Compute distances between phylogenetic trees.
+    
+    Usage: tlynx compare (-d|--distance MEASURE) [-s|--summary-statistics]
+                         [INPUT-FILES]
+    
+    Available options:
+      -d,--distance MEASURE    Type of distance to calculate (available distance
+                               measures are listed below)
+      -s,--summary-statistics  Report summary statistics only
+      INPUT-FILES              Read tree(s) from INPUT-FILES; if more files are
+                               given, one tree is expected per file
+      -h,--help                Show this help text
+    
+    Available distance measures:
+      Symmetric distance: -d symmetric
+      Incompatible split distance: -d incompatible-split[VAL]
+        Collapse branches with support less than VAL before distance calculation;
+        in this way, only well supported difference contribute to the distance measure.
+
+
+## Examine
+
+Compute summary statistics of phylogenetic trees.
+
+    tlynx examine --help
+
+    Compute summary statistics of phylogenetic trees.
+    
+    Usage: tlynx examine [INPUT-FILE]
+    
+    Available options:
+      INPUT-FILE               Read trees from INPUT-FILE
+      -h,--help                Show this help text
+
+
+## Simulate
+
+Simulate phylogenetic trees using birth and death processes.
+
+    tlynx simulate --help
+
+    Simulate phylogenetic trees using birth and death processes.
+    
+    Usage: tlynx simulate [-t|--nTrees INT] [-n|--nLeaves INT] [-H|--height DOUBLE]
+                          [-M|--condition-on-mrca] [-l|--lambda DOUBLE]
+                          [-m|--mu DOUBLE] [-r|--rho DOUBLE] [-u|--sub-sample]
+                          [-s|--summary-statistics] [-S|--seed [INT]]
+      Simulate reconstructed trees using the point process. See Gernhard, T. (2008).
+      The conditioned reconstructed process. Journal of Theoretical Biology, 253(4),
+      769–778. http://doi.org/10.1016/j.jtbi.2008.04.005
+    
+    Available options:
+      -t,--nTrees INT          Number of trees (default: 10)
+      -n,--nLeaves INT         Number of leaves per tree (default: 5)
+      -H,--height DOUBLE       Fix tree height (no default)
+      -M,--condition-on-mrca   Do not condition on height of origin but on height of
+                               MRCA
+      -l,--lambda DOUBLE       Birth rate lambda (default: 1.0)
+      -m,--mu DOUBLE           Death rate mu (default: 0.9)
+      -r,--rho DOUBLE          Sampling probability rho (default: 1.0)
+      -u,--sub-sample          Perform sub-sampling; see below.
+      -s,--summary-statistics  Only output number of children for each branch
+      -S,--seed [INT]          Seed for random number generator; list of 32 bit
+                               integers with up to 256 elements (default: random)
+      -h,--help                Show this help text
+    
+    Height of Trees: if no tree height is given, the heights will be randomly drawn from the expected distribution given the number of leaves, the birth and the death rate.
+    Summary statistics only: only print (NumberOfExtantChildren BranchLength) pairs for each branch of each tree. The trees are separated by a newline character.
+    Sub-sampling: simulate one big tree with n'=round(n/rho), n'>=n, leaves, and randomly sample sub-trees with n leaves. Hence, with rho=1.0, the same tree is reported over and over again.
+
+
+# ELynx
+
+Documentation of the library can be found on Hackage.
+
diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,39 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+{- |
+Module      :  Main
+Description :  Work with phylogenetic trees
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Thu Sep  5 21:53:07 2019.
+
+-}
+
+module Main where
+
+import           Control.Monad.Trans.Reader
+
+import           Options
+
+import           Compare.Compare
+import           Examine.Examine
+import           Simulate.Simulate
+
+import           ELynx.Tools.Logger
+import           ELynx.Tools.Options
+
+main :: IO ()
+main = do
+  Arguments g c <- parseArguments
+  let fn  = outFileBaseName g
+      lvl = verbosity g
+      lf  = (++ ".log") <$> fn
+  case c of
+    Compare a  -> runReaderT (eLynxWrapper lvl lf compareHeader  $ compareTrees fn) a
+    Examine a  -> runReaderT (eLynxWrapper lvl lf examineHeader  $ examine fn) a
+    Simulate a -> runReaderT (eLynxWrapper lvl lf simulateHeader $ simulate fn) a
diff --git a/app/Options.hs b/app/Options.hs
new file mode 100644
--- /dev/null
+++ b/app/Options.hs
@@ -0,0 +1,86 @@
+{- |
+Module      :  Options
+Description :  TLynx general options
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Sat Sep  7 18:55:03 2019.
+
+-}
+
+module Options
+  ( Arguments (..)
+  , CommandArguments (..)
+  , parseArguments
+  , compareHeader
+  , examineHeader
+  , simulateHeader
+  ) where
+
+import           Options.Applicative
+import           Options.Applicative.Help.Pretty
+
+import           Compare.Options
+import           Examine.Options
+import           Simulate.Options
+
+import           ELynx.Tools.Options
+
+data CommandArguments =
+  Compare CompareArguments
+  | Examine ExamineArguments
+  | Simulate SimulateArguments
+
+compareHeader, examineHeader, simulateHeader :: String
+compareHeader  =  "Compute distances between phylogenetic trees."
+examineHeader  =  "Compute summary statistics of phylogenetic trees."
+simulateHeader =  "Simulate phylogenetic trees using birth and death processes."
+
+compareCommand :: Mod CommandFields CommandArguments
+compareCommand = command "compare" $
+                     info (Compare <$> compareArguments)
+                     ( fullDesc
+                       <> header compareHeader
+                       <> footerDoc (Just $ pretty compareFooter) )
+
+examineCommand :: Mod CommandFields CommandArguments
+examineCommand = command "examine" $
+                     info (Examine <$> examineArguments)
+                     $ header examineHeader
+
+simulateCommand :: Mod CommandFields CommandArguments
+simulateCommand = command "simulate" $
+                   info (Simulate <$> simulateArguments)
+                     ( fullDesc
+                       <> header simulateHeader
+                       <> progDesc simulateDesc
+                       <> footerDoc (Just $ pretty simulateFooter) )
+
+commandArguments :: Parser CommandArguments
+commandArguments = hsubparser $
+                   compareCommand
+                   <> examineCommand
+                   <> simulateCommand
+
+data Arguments = Arguments
+  { globalArgs :: GlobalArguments
+  , cmdArgs    :: CommandArguments }
+
+parseArguments :: IO Arguments
+parseArguments = parseArgumentsWith desc ftr $
+                 Arguments
+                 <$> globalArguments
+                 <*> commandArguments
+
+desc :: [String]
+desc = [ "Compare, examine, and simulate phylogenetic trees." ]
+
+ftr :: [String]
+ftr = "File formats:" : fs
+  where
+    toListItem = ("  - " ++)
+    fs = map toListItem ["Newick"]
diff --git a/src/Compare/Compare.hs b/src/Compare/Compare.hs
new file mode 100644
--- /dev/null
+++ b/src/Compare/Compare.hs
@@ -0,0 +1,144 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell   #-}
+
+{- |
+Description :  Compute distances between trees
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Wed May 29 18:09:39 2019.
+
+- Symmetric (Robinson-Foulds) distance.
+- Incompatible splits distance.
+
+-}
+
+module Compare.Compare
+  ( compareTrees
+  )
+where
+
+import           Control.Monad
+import           Control.Monad.IO.Class
+import           Control.Monad.Logger
+import           Control.Monad.Trans.Class
+import           Control.Monad.Trans.Reader
+import qualified Data.ByteString.Lazy.Char8        as L
+import qualified Data.Text                         as T
+import qualified Data.Text.IO                      as T
+import qualified Data.Text.Lazy                    as LT
+import qualified Data.Text.Lazy.Encoding           as LT
+import           Data.Tree
+import qualified Data.Vector.Unboxed               as V
+import           Statistics.Sample
+import           System.IO
+import           Text.Printf
+
+import           Compare.Options
+
+import           ELynx.Data.Tree.BranchSupportTree as B
+import           ELynx.Data.Tree.Distance
+import           ELynx.Data.Tree.MeasurableTree    as M
+import           ELynx.Data.Tree.NamedTree
+import           ELynx.Data.Tree.PhyloTree
+import           ELynx.Export.Tree.Newick
+import           ELynx.Import.Tree.Newick
+import           ELynx.Tools.ByteString            (alignLeft, alignRight)
+import           ELynx.Tools.InputOutput
+import           ELynx.Tools.Logger
+
+pf :: String
+pf = "%.3f"
+
+header :: Int -> Distance -> L.ByteString
+header n d = alignLeft (n+2) "Tree 1"
+           <> alignLeft (n+2) "Tree 2"
+           <> alignRight 20 (L.pack $ show d)
+
+showTriplet :: (PrintfArg a) => Int -> [String] -> (Int, Int, a) -> L.ByteString
+showTriplet n args (i, j, d) = i' <> j' <> d'
+  where i' = alignLeft  (n+2) $ L.pack (args !! i)
+        j' = alignLeft  (n+2) $ L.pack (args !! j)
+        d' = alignRight 20    $ L.pack (printf pf d)
+
+-- | Compute distance functions between phylogenetic trees.
+compareTrees :: Maybe FilePath -> Compare ()
+compareTrees outFileBN = do
+  a <- lift ask
+  -- Determine output handle (stdout or file).
+  let outFile = (++ ".out") <$> outFileBN
+  outH <- liftIO $ maybe (pure stdout) (`openFile` WriteMode) outFile
+  let tfps = argsInFiles a
+  (trees, names) <-
+    if length tfps <= 1
+    then
+      do ts <- if null tfps
+              then do $(logInfo) "Read trees from standard input."
+                      liftIO $ parseIOWith manyNewick
+              else do let f = head tfps
+                      $(logInfo) $ T.pack $ "Read trees from file: " <> f <> "."
+                      liftIO $ parseFileWith manyNewick f
+         let n = length ts
+         when (n <= 1) (error "Not enough trees found in file.")
+         $(logInfo) "Compute pairwise distances between trees in the same file."
+         $(logInfo) $ T.pack $ "Trees are numbered from 0 to " ++ show (n-1) ++ "."
+         return (ts, take n (map show [0 :: Int ..]))
+    else
+      do $(logInfo) "Read trees from files."
+         ts <- liftIO $ mapM (parseFileWith newick) tfps
+         when (length ts <= 1) (error "Not enough trees found in files.")
+         $(logInfo) "Compute pairwise distances between trees from different files."
+         $(logInfo) "Trees are named according to their file names."
+         return (ts, tfps)
+  $(logDebug) "The trees are:"
+  $(logDebug) $ LT.toStrict $ LT.decodeUtf8 $ L.unlines $ map toNewick trees
+  case outFile of
+    Nothing -> logNewSection "Write results to standard output."
+    Just f  -> logNewSection $ T.pack $ "Write results to file " <> f <> "."
+  let n        = maximum $ 6 : map length names
+      distance = argsDistance a
+  case distance of
+    Symmetric -> $(logInfo) "Use symmetric (Robinson-Foulds) distance."
+    IncompatibleSplit val -> do
+      $(logInfo) "Use incompatible split distance."
+      $(logInfo) $ T.pack $ "Collapse nodes with support less than " ++ show val ++ "."
+    BranchScore False -> $(logInfo) "Use branch score distance without normalization."
+    BranchScore True -> $(logInfo) "Use branch score distance with normalization."
+  let distanceMeasure :: Tree PhyloByteStringLabel -> Tree PhyloByteStringLabel -> Double
+      distanceMeasure = case distance of
+        Symmetric           -> \t1 t2 -> fromIntegral $ symmetricDistanceWith getName t1 t2
+        IncompatibleSplit _ -> \t1 t2 -> fromIntegral $ incompatibleSplitsDistanceWith getName t1 t2
+        BranchScore _       -> branchScoreDistance
+      normalizeF = case distance of
+        BranchScore True -> M.normalize
+        _                -> id
+      collapseF = case distance of
+        -- For the incompatible split distance we have to collapse branches with
+        -- support lower than the given value. Before doing so, we normalize the
+        -- branch support values.
+        IncompatibleSplit val -> collapse val . B.normalize
+        _                     -> id
+      trees' = map (collapseF . normalizeF) trees
+  $(logDebug) "The prepared trees are:"
+  $(logDebug) $ LT.toStrict $ LT.decodeUtf8 $ L.unlines $ map toNewick trees'
+  let dsTriplets = computePairwiseDistances distanceMeasure trees'
+      ds = map (\(_, _, x) -> x) dsTriplets
+      dsVec = V.fromList ds
+  -- XXX: It may be good to use the common 'io' function also here.
+  liftIO $ hPutStrLn outH $ "Summary statistics of " ++ show distance ++ " Distance:"
+  liftIO $ T.hPutStrLn outH $ T.justifyLeft 10 ' ' "Mean: " <> T.pack (printf pf (mean dsVec))
+  liftIO $ T.hPutStrLn outH $ T.justifyLeft 10 ' ' "Variance: " <> T.pack (printf pf (variance dsVec))
+  -- L.putStrLn $ L.unlines $ map toNewick ts
+  -- L.putStrLn $ L.unlines $ map toNewick tsN
+  -- L.putStrLn $ L.unlines $ map toNewick tsC
+  lift $ unless (argsSummaryStatistics a) (
+    do
+      lift $ hPutStrLn outH ""
+      lift $ L.hPutStrLn outH $ header n distance
+      lift $ L.hPutStr outH $ L.unlines (map (showTriplet n names) dsTriplets)
+    )
+  liftIO $ hClose outH
diff --git a/src/Compare/Options.hs b/src/Compare/Options.hs
new file mode 100644
--- /dev/null
+++ b/src/Compare/Options.hs
@@ -0,0 +1,126 @@
+{- |
+Module      :  Compare.Options
+Description :  Options of tree-dist
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Thu Aug 29 13:02:22 2019.
+
+-}
+
+module Compare.Options
+  ( CompareArguments (..)
+  , Compare
+  , Distance (..)
+  , compareArguments
+  , compareFooter
+  ) where
+
+import           Control.Monad.Logger
+import           Control.Monad.Trans.Reader
+import           Data.List
+import           Data.Void
+import           Options.Applicative
+import           Text.Megaparsec            (Parsec, try)
+import           Text.Megaparsec.Char       (char, string)
+import           Text.Megaparsec.Char.Lexer (float)
+import           Text.Printf
+
+import           ELynx.Tools.Options
+
+-- | Supported distance measures.
+data Distance =
+  Symmetric                     -- ^ Symmetric distance.
+  | IncompatibleSplit Double    -- ^ Incompatible split distance; collapse nodes
+                                -- with branch support below given value.
+  | BranchScore Bool            -- ^ Branch score distance. If given, normalize
+                                -- the trees before comparison.
+
+instance Show Distance where
+  show Symmetric             = "Symmetric"
+  show (IncompatibleSplit c) = "Incompatible Split (" ++ printf "%.1f" c ++ ")"
+  show (BranchScore False)   = "Branch Score"
+  show (BranchScore True )   = "Branch Score (normalized)"
+
+-- | Arguments needed to compute distance measures.
+data CompareArguments = CompareArguments
+  { argsDistance          :: Distance
+  , argsSummaryStatistics :: Bool
+  , argsInFiles           :: [FilePath]
+  }
+
+-- | Lgger and reader data type.
+type Compare = LoggingT (ReaderT CompareArguments IO)
+
+-- | COmmand line parser.
+compareArguments :: Parser CompareArguments
+compareArguments = CompareArguments <$>
+  distanceOpt
+  <*> summaryStatisticsSwitch
+  <*> many inFilesArg
+
+inFilesArg :: Parser FilePath
+inFilesArg = strArgument $
+  metavar "INPUT-FILES" <>
+  help "Read tree(s) from INPUT-FILES; if more files are given, one tree is expected per file"
+
+symmetric :: Parsec Void String Distance
+symmetric = do
+  _ <- string "symmetric"
+  pure Symmetric
+
+incompatibleSplit :: Parsec Void String Distance
+incompatibleSplit = do
+  _ <- string "incompatible-split"
+  _ <- char '['
+  f <- float
+  _ <- char ']'
+  if (0 < f) && (f < 1)
+    then pure $ IncompatibleSplit f
+    else error "Branch support has to be between 0 and 1."
+
+branchScore :: Parsec Void String Distance
+branchScore = do
+  _ <- string "branch-score"
+  pure (BranchScore False)
+
+branchScoreNormalized :: Parsec Void String Distance
+branchScoreNormalized = do
+  _ <- string "branch-score-normalized"
+  pure (BranchScore True)
+
+distanceParser :: Parsec Void String Distance
+distanceParser = try symmetric
+                 <|> try incompatibleSplit
+                 -- Try first the normalized one, since the normal branch score
+                 -- parser also succeeds in this case.
+                 <|> try branchScoreNormalized
+                 <|> try branchScore
+
+distanceOpt :: Parser Distance
+distanceOpt = option (megaReadM distanceParser) $
+  long "distance" <>
+  short 'd' <>
+  metavar "MEASURE" <>
+  help "Type of distance to calculate (available distance measures are listed below)"
+
+summaryStatisticsSwitch :: Parser Bool
+summaryStatisticsSwitch = switch $
+  long "summary-statistics" <>
+  short 's' <>
+  help "Report summary statistics only"
+
+-- | Information about provided distance types.
+compareFooter :: String
+compareFooter = intercalate "\n"
+  [ "Available distance measures:"
+  , "  Symmetric distance: -d symmetric"
+  , "  Incompatible split distance: -d incompatible-split[VAL]"
+  , "    Collapse branches with support less than VAL before distance calculation;"
+  , "    in this way, only well supported difference contribute to the distance measure."
+  , "  Branch score distance : -d branch-score"
+  , "                          -d branch-score-normalized (normalize trees before comparison)" ]
diff --git a/src/Examine/Examine.hs b/src/Examine/Examine.hs
new file mode 100644
--- /dev/null
+++ b/src/Examine/Examine.hs
@@ -0,0 +1,53 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell   #-}
+
+{- |
+Description :  Analyze trees
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Fri May 24 13:47:56 2019.
+
+-}
+
+module Examine.Examine
+  ( examine
+  )
+where
+
+import           Control.Monad.IO.Class
+import           Control.Monad.Logger
+import           Control.Monad.Trans.Class
+import           Control.Monad.Trans.Reader
+import qualified Data.ByteString.Lazy.Char8     as L
+import qualified Data.Text                      as T
+import           Data.Tree
+
+import           Examine.Options
+
+import           ELynx.Data.Tree.MeasurableTree
+import           ELynx.Data.Tree.PhyloTree
+import           ELynx.Import.Tree.Newick
+import           ELynx.Tools.InputOutput
+import           ELynx.Tools.Logger
+
+readTrees :: Maybe FilePath -> Examine [Tree PhyloByteStringLabel]
+readTrees mfp = do
+  case mfp of
+    Nothing -> $(logInfo) "Read tree(s) from standard input."
+    Just fp -> $(logInfo) $ T.pack $ "Read tree(s) from file " <> fp <> "."
+  liftIO $ parseFileOrIOWith manyNewick mfp
+
+-- | Examine phylogenetic trees.
+examine :: Maybe FilePath -> Examine ()
+examine outFn = do
+  ExamineArguments inFn <- lift ask
+  trs <- readTrees inFn
+  let lsStrs = map summarize trs
+  let outFilePath = (++ ".out") <$> outFn
+  logNewSection "Results."
+  io "results of tree analysis" (L.intercalate (L.pack "\n") lsStrs) outFilePath
diff --git a/src/Examine/Options.hs b/src/Examine/Options.hs
new file mode 100644
--- /dev/null
+++ b/src/Examine/Options.hs
@@ -0,0 +1,39 @@
+{- |
+Module      :  Examine.Options
+Description :  Tree analysis options
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Thu Aug 29 08:16:45 2019.
+
+-}
+
+module Examine.Options
+  ( ExamineArguments (..)
+  , Examine
+  , examineArguments
+  ) where
+
+import           Control.Monad.Logger
+import           Control.Monad.Trans.Reader
+import           Options.Applicative
+
+-- | Arguments needed to examine phylogenetic trees.
+newtype ExamineArguments = ExamineArguments
+  { inFile     :: Maybe FilePath }
+
+-- | Logger and reader data type.
+type Examine = LoggingT (ReaderT ExamineArguments IO)
+
+-- | Command line parser.
+examineArguments :: Parser ExamineArguments
+examineArguments = ExamineArguments <$> optional inFileArg
+
+inFileArg :: Parser FilePath
+inFileArg = strArgument $
+  metavar "INPUT-FILE" <>
+  help "Read trees from INPUT-FILE"
diff --git a/src/Simulate/Options.hs b/src/Simulate/Options.hs
new file mode 100644
--- /dev/null
+++ b/src/Simulate/Options.hs
@@ -0,0 +1,164 @@
+{- |
+Module      :  Simulate.Options
+Description :  Argument parser for seq-ana
+Copyright   :  (c) Dominik Schrempf 2019
+License     :  GPL-3
+
+Maintainer  :  dominik.schrempf@gmail.com
+Stability   :  unstable
+Portability :  portable
+
+Creation date: Fri May  3 11:51:07 2019.
+
+-}
+
+module Simulate.Options
+  ( SimulateArguments (..)
+  , Simulate
+  , simulateArguments
+  , reportSimulateArguments
+  , simulateDesc
+  , simulateFooter
+  ) where
+
+import           Control.Monad.Logger
+import           Control.Monad.Trans.Reader
+import           Data.List
+import           Data.Word
+import           Options.Applicative
+
+import           ELynx.Tools.Options
+
+-- | Arguments need to simulate phylogenetic trees.
+data SimulateArguments = SimulateArguments
+  { argsNTrees        :: Int            -- ^ Simulated trees.
+  , argsNLeaves       :: Int            -- ^ Number of leaves.
+  , argsHeight        :: Maybe Double   -- ^ Tree height (time to origin or MRCA).
+  , argsConditionMRCA :: Bool           -- ^ False: condition on origin; True:
+                                          --   condition on MRCA.
+  , argsLambda        :: Double         -- ^ Birth rate.
+  , argsMu            :: Double         -- ^ Death rate.
+  , argsRho           :: Double         -- ^ Smapling rate.
+  , argsSubSample     :: Bool           -- ^ Perform actual sub-sampling.
+  , argsSumStat       :: Bool           -- ^ Only print summary statistics?
+  , argsSeed          :: Maybe [Word32] -- ^ Seed of NRG, random if 'Nothing'.
+  }
+
+-- | Logger and reader data type.
+type Simulate = LoggingT (ReaderT SimulateArguments IO)
+
+-- | Print useful information about the provided arguments.
+reportSimulateArguments :: SimulateArguments -> String
+reportSimulateArguments a =
+  intercalate "\n" [ "Number of simulated trees: " ++ show (argsNTrees a)
+                   , "Number of leaves per tree: " ++ show (argsNLeaves a)
+                   , "Height of trees: " ++ hStr
+                   , "Birth rate: " ++ show (argsLambda a)
+                   , "Death rate: " ++ show (argsMu a)
+                   , "Sampling probability: " ++ show (argsRho a)
+                   , "Perform sub-sampling: " ++ show (argsSubSample a)
+                   , "Summary statistics only: " ++ show (argsSumStat a)
+                   , "Seed: " ++ sStr ]
+  where hStr = case argsHeight a of Nothing -> "Random height of origin"
+                                    Just h  -> show h ++ ", conditioned on "
+                                      ++ if argsConditionMRCA a then "MRCA" else "origin"
+        sStr = case argsSeed a of Nothing -> "Random"
+                                  Just i  -> show i
+
+-- | Command line parser.
+simulateArguments :: Parser SimulateArguments
+simulateArguments = SimulateArguments
+  <$> nTreeOpt
+  <*> nLeavesOpt
+  <*> treeHeightOpt
+  <*> conditionMRCAOpt
+  <*> lambdaOpt
+  <*> muOpt
+  <*> rhoOpt
+  <*> subSampleOpt
+  <*> sumStatOpt
+  <*> seedOpt
+
+nTreeOpt :: Parser Int
+nTreeOpt = option auto $
+  long "nTrees"
+  <> short 't'
+  <> metavar "INT"
+  <> value 10
+  <> showDefault
+  <> help "Number of trees"
+
+nLeavesOpt :: Parser Int
+nLeavesOpt = option auto $
+  long "nLeaves"
+  <> short 'n'
+  <> metavar "INT"
+  <> value 5
+  <> showDefault
+  <> help "Number of leaves per tree"
+
+treeHeightOpt :: Parser (Maybe Double)
+treeHeightOpt = optional $ option auto $
+  long "height"
+  <> short 'H'
+  <> metavar "DOUBLE"
+  <> help "Fix tree height (no default)"
+
+conditionMRCAOpt :: Parser Bool
+conditionMRCAOpt = switch $
+  long "condition-on-mrca"
+  <> short 'M'
+  <> showDefault
+  <> help "Do not condition on height of origin but on height of MRCA"
+
+lambdaOpt :: Parser Double
+lambdaOpt = option auto $
+  long "lambda"
+  <> short 'l'
+  <> metavar "DOUBLE"
+  <> value 1.0
+  <> showDefault
+  <> help "Birth rate lambda"
+
+muOpt :: Parser Double
+muOpt = option auto $
+  long "mu"
+  <> short 'm'
+  <> metavar "DOUBLE"
+  <> value 0.9
+  <> showDefault
+  <> help "Death rate mu"
+
+rhoOpt :: Parser Double
+rhoOpt = option auto $
+  long "rho"
+  <> short 'r'
+  <> metavar "DOUBLE"
+  <> value 1.0
+  <> help "Sampling probability rho (default: 1.0)"
+
+subSampleOpt :: Parser Bool
+subSampleOpt = switch $
+  long "sub-sample"
+  <> short 'u'
+  <> showDefault
+  <> help "Perform sub-sampling; see below."
+
+sumStatOpt :: Parser Bool
+sumStatOpt = switch $
+  long "summary-statistics"
+  <> short 's'
+  <> showDefault
+  <> help "Only output number of children for each branch"
+
+-- | Simulation is a little more involved, so we provide a description.
+simulateDesc :: String
+simulateDesc = "Simulate reconstructed trees using the point process. See Gernhard, T. (2008). The conditioned reconstructed process. Journal of Theoretical Biology, 253(4), 769–778. http://doi.org/10.1016/j.jtbi.2008.04.005"
+
+-- | And a footer.
+simulateFooter :: String
+simulateFooter = intercalate "\n"
+  [ "Height of Trees: if no tree height is given, the heights will be randomly drawn from the expected distribution given the number of leaves, the birth and the death rate."
+  , "Summary statistics only: only print (NumberOfExtantChildren BranchLength) pairs for each branch of each tree. The trees are separated by a newline character."
+  , "Sub-sampling: simulate one big tree with n'=round(n/rho), n'>=n, leaves, and randomly sample sub-trees with n leaves. Hence, with rho=1.0, the same tree is reported over and over again."
+      ]
diff --git a/src/Simulate/Simulate.hs b/src/Simulate/Simulate.hs
new file mode 100644
--- /dev/null
+++ b/src/Simulate/Simulate.hs
@@ -0,0 +1,113 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell   #-}
+{-# LANGUAGE TupleSections     #-}
+
+{- |
+   Description :  Simulate reconstructed trees
+   Copyright   :  (c) Dominik Schrempf 2018
+   License     :  GPL-3
+
+   Maintainer  :  dominik.schrempf@gmail.com
+   Stability   :  unstable
+   Portability :  portable
+
+Creation date: Tue Feb 27 17:27:16 2018.
+
+See Gernhard, T. (2008). The conditioned reconstructed process. Journal of
+Theoretical Biology, 253(4), 769–778. http://doi.org/10.1016/j.jtbi.2008.04.005.
+
+Mon Feb 4 14:26:11 CET 2019: Adding sampling probability rho. See Article
+(Stadler2009) Stadler, T. On incomplete sampling under birth–death models and
+connections to the sampling-based coalescent Journal of Theoretical Biology,
+Elsevier BV, 2009, 261, 58-66
+
+-}
+
+module Simulate.Simulate
+  ( simulate
+  )
+where
+
+import           Control.Concurrent                   (getNumCapabilities)
+import           Control.Concurrent.Async.Lifted.Safe (mapConcurrently)
+import           Control.Monad
+import           Control.Monad.IO.Class
+import           Control.Monad.Logger
+import           Control.Monad.Trans.Class
+import           Control.Monad.Trans.Reader
+import           Control.Parallel.Strategies
+import qualified Data.ByteString.Lazy.Char8           as L
+import           Data.Maybe
+import qualified Data.Sequence                        as Seq
+import qualified Data.Text                            as T
+import qualified Data.Text.Lazy                       as LT
+import qualified Data.Text.Lazy.Encoding              as LT
+import           Data.Tree
+
+import           Simulate.Options
+
+import           ELynx.Data.Tree.MeasurableTree
+import           ELynx.Data.Tree.PhyloTree            (PhyloIntLabel)
+import           ELynx.Data.Tree.SumStat              (formatNChildSumStat,
+                                                       toNChildSumStat)
+import           ELynx.Data.Tree.Tree
+import           ELynx.Export.Tree.Newick             (toNewick)
+import           ELynx.Simulate.PointProcess          (simulateNReconstructedTrees,
+                                                       simulateReconstructedTree)
+import           ELynx.Tools.Concurrent
+import           ELynx.Tools.InputOutput
+import           ELynx.Tools.Logger
+
+-- | Simulate phylogenetic trees.
+simulate :: Maybe FilePath -> Simulate ()
+simulate outFile = do
+  a <- lift ask
+  when (isNothing (argsHeight a) && argsConditionMRCA a) $
+    error "Cannot condition on MRCA (-M) when height is not given (-H)."
+  let s = argsSumStat a
+  nCap <- liftIO getNumCapabilities
+  logNewSection "Arguments"
+  $(logInfo) $ T.pack $ reportSimulateArguments a
+  logNewSection "Simulation"
+  $(logInfo) $ T.pack $ "Number of used cores: " <> show nCap
+  trs <- if argsSubSample a
+         then simulateAndSubSampleNTreesConcurrently nCap
+         else simulateNTreesConcurrently nCap
+  let ls = if s
+           then parMap rpar (formatNChildSumStat . toNChildSumStat) trs
+           else parMap rpar toNewick trs
+  let outFile' = (++ ".tree") <$> outFile
+  let res = L.unlines ls
+  io "simulated trees" res outFile'
+
+simulateNTreesConcurrently :: Int -> Simulate [Tree PhyloIntLabel]
+simulateNTreesConcurrently c = do
+  (SimulateArguments nT nL h cM l m r _ _ s) <- lift ask
+  let l' = l * r
+      m' = m - l * (1.0 - r)
+  gs <- liftIO $ getNGen c s
+  let chunks = getChunks c nT
+      timeSpec = fmap (, cM) h
+  trss <- liftIO $ mapConcurrently
+          (\(n, g) -> simulateNReconstructedTrees n nL timeSpec l' m' g)
+          (zip chunks gs)
+  return $ concat trss
+
+simulateAndSubSampleNTreesConcurrently :: Int -> Simulate [Tree PhyloIntLabel]
+simulateAndSubSampleNTreesConcurrently c = do
+  (SimulateArguments nT nL h cM l m r _ _ s) <- lift ask
+  let nLeavesBigTree = (round $ fromIntegral nL / r) :: Int
+  gs <- liftIO $ getNGen c s
+  let chunks = getChunks c nT
+      timeSpec = fmap (, cM) h
+  tr <- liftIO $ simulateReconstructedTree nLeavesBigTree timeSpec l m (head gs)
+  logNewSection $ T.pack $ "Simulate one big tree with " <> show nLeavesBigTree <> " leaves."
+  -- Log the base tree.
+  $(logInfo) $ LT.toStrict $ LT.decodeUtf8 $ toNewick tr
+  logNewSection $ T.pack $ "Sub sample " <> show nT <> " trees with " <> show nL <> " leaves."
+  let lvs = Seq.fromList $ leaves tr
+  trss <- liftIO $ mapConcurrently
+          (\(nSamples, g) -> nSubSamples nSamples lvs nL tr g)
+          (zip chunks gs)
+  let trs = catMaybes $ concat trss
+  return $ map prune trs
diff --git a/tlynx.cabal b/tlynx.cabal
new file mode 100644
--- /dev/null
+++ b/tlynx.cabal
@@ -0,0 +1,87 @@
+cabal-version: 1.12
+name: tlynx
+version: 0.0.1
+license: GPL-3
+license-file: LICENSE
+copyright: Dominik Schrempf (2019)
+maintainer: dominik.schrempf@gmail.com
+author: Dominik Schrempf
+homepage: https://github.com/dschrempf/elynx#readme
+bug-reports: https://github.com/dschrempf/elynx/issues
+synopsis: Handle phylogenetic trees
+description:
+    Examine, compare, and simulate phylogenetic trees in a reproducible way. Please see the README on GitHub at <https://github.com/dschrempf/elynx>.
+category: Bioinformatics
+build-type: Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+    type: git
+    location: https://github.com/dschrempf/elynx
+
+library
+    exposed-modules:
+        Compare.Compare
+        Compare.Options
+        Examine.Examine
+        Examine.Options
+        Simulate.Options
+        Simulate.Simulate
+    hs-source-dirs: src
+    other-modules:
+        Paths_tlynx
+    default-language: Haskell2010
+    ghc-options: -Wall
+    build-depends:
+        QuickCheck >=2.13.2 && <2.14,
+        base >=4.12.0.0 && <4.13,
+        bytestring >=0.10.8.2 && <0.11,
+        containers >=0.6.0.1 && <0.7,
+        elynx-seq >=0.0.1 && <0.1,
+        elynx-tools >=0.0.1 && <0.1,
+        elynx-tree >=0.0.1 && <0.1,
+        lifted-async >=0.10.0.4 && <0.11,
+        math-functions >=0.3.1.0 && <0.4,
+        megaparsec >=7.0.5 && <7.1,
+        monad-logger >=0.3.30 && <0.4,
+        mwc-random >=0.14.0.0 && <0.15,
+        optparse-applicative >=0.14.3.0 && <0.15,
+        parallel >=3.2.2.0 && <3.3,
+        primitive >=0.6.4.0 && <0.7,
+        quickcheck-instances >=0.3.22 && <0.4,
+        statistics >=0.15.0.0 && <0.16,
+        text >=1.2.3.1 && <1.3,
+        transformers >=0.5.6.2 && <0.6,
+        vector >=0.12.0.3 && <0.13
+
+executable tlynx
+    main-is: Main.hs
+    hs-source-dirs: app
+    other-modules:
+        Options
+        Paths_tlynx
+    default-language: Haskell2010
+    ghc-options: -Wall -eventlog -threaded -rtsopts -with-rtsopts=-N
+    build-depends:
+        QuickCheck >=2.13.2 && <2.14,
+        base >=4.12.0.0 && <4.13,
+        bytestring >=0.10.8.2 && <0.11,
+        containers >=0.6.0.1 && <0.7,
+        elynx-tools >=0.0.1 && <0.1,
+        elynx-tree >=0.0.1 && <0.1,
+        lifted-async >=0.10.0.4 && <0.11,
+        math-functions >=0.3.1.0 && <0.4,
+        megaparsec >=7.0.5 && <7.1,
+        monad-logger >=0.3.30 && <0.4,
+        mwc-random >=0.14.0.0 && <0.15,
+        optparse-applicative >=0.14.3.0 && <0.15,
+        parallel >=3.2.2.0 && <3.3,
+        primitive >=0.6.4.0 && <0.7,
+        quickcheck-instances >=0.3.22 && <0.4,
+        statistics >=0.15.0.0 && <0.16,
+        text >=1.2.3.1 && <1.3,
+        tlynx -any,
+        transformers >=0.5.6.2 && <0.6,
+        vector >=0.12.0.3 && <0.13
