diff --git a/appveyor.yml b/appveyor.yml
index 5d6fdc5..676c4fc 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,19 +1,16 @@
+---
 cache:
-- '%APPDATA%\cabal'
-- '%APPDATA%\ghc'
+  - '%APPDATA%\cabal'
+  - '%APPDATA%\ghc'
 
 install:
-- choco install ghc --version 8.2.2
-- refreshenv
+  - choco install ghc --version 8.2.2
+  - refreshenv
 
 build_script:
-- cabal update
-- cabal install alex happy
-- cabal install --enable-tests --enable-benchmarks --disable-documentation --only-dependencies
+  - cabal update
+  - cabal install alex happy
+  - cabal install --enable-tests --enable-benchmarks --disable-documentation --only-dependencies
 
 test_script:
-- cabal test
-
-branches:
-  only:
-  - master
+  - cabal test
diff --git a/stack.yaml b/stack.yaml
index c254d76..f34e73b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,55 +1,56 @@
+---
 packages: [.]
 resolver: lts-6.27
 extra-deps:
-- HUnit-1.6.0.0
-- QuickCheck-2.11.3
-- aeson-1.4.0.0
-- aeson-compat-0.3.8
-- attoparsec-0.13.2.2
-- attoparsec-iso8601-1.0.0.0
-- base-compat-0.10.4
-- base-orphans-0.5.4
-- bifunctors-5.5.3
-- binary-orphans-0.1.8.0
-- bsb-http-chunked-0.0.0.2
-- bytestring-builder-0.10.8.1.0
-- cabal-doctest-1.0.6
-- case-insensitive-1.2.0.11
-- cpphs-1.20.8
-- exceptions-0.8.3
-- fast-logger-2.4.11
-- github-0.19
-- hspec-2.5.5
-- hspec-core-2.5.5
-- hspec-discover-2.5.5
-- hspec-expectations-0.8.2
-- http-api-data-0.3.8.1
-- http-media-0.7.1.2
-- http-types-0.12.1
-- mmorph-1.1.2
-- natural-transformation-0.4
-- network-2.7.0.2
-- parsec-3.1.13.0
-- quickcheck-io-0.2.0
-- resourcet-1.1.11
-- safe-0.3.17
-- semigroupoids-5.2.1
-- semigroups-0.18.5
-- servant-0.13.0.1
-- servant-server-0.13.0.1
-- singleton-bool-0.1.4
-- split-0.2.3.3
-- string-conversions-0.4.0.1
-- tagged-0.8.6
-- text-1.2.3.0
-- th-abstraction-0.2.8.0
-- transformers-compat-0.5.1.4
-- unix-compat-0.5.0.1
-- unix-time-0.3.8
-- unliftio-core-0.1.1.0
-- vault-0.3.1.1
-- vector-binary-instances-0.2.4
-- vector-instances-3.4
-- wai-extra-3.0.22.0
-- warp-3.2.23
-- word8-0.1.3
+  - HUnit-1.6.0.0
+  - QuickCheck-2.11.3
+  - aeson-1.4.0.0
+  - aeson-compat-0.3.8
+  - attoparsec-0.13.2.2
+  - attoparsec-iso8601-1.0.0.0
+  - base-compat-0.10.4
+  - base-orphans-0.5.4
+  - bifunctors-5.5.3
+  - binary-orphans-0.1.8.0
+  - bsb-http-chunked-0.0.0.2
+  - bytestring-builder-0.10.8.1.0
+  - cabal-doctest-1.0.6
+  - case-insensitive-1.2.0.11
+  - cpphs-1.20.8
+  - exceptions-0.8.3
+  - fast-logger-2.4.11
+  - github-0.19
+  - hspec-2.5.5
+  - hspec-core-2.5.5
+  - hspec-discover-2.5.5
+  - hspec-expectations-0.8.2
+  - http-api-data-0.3.8.1
+  - http-media-0.7.1.2
+  - http-types-0.12.1
+  - mmorph-1.1.2
+  - natural-transformation-0.4
+  - network-2.7.0.2
+  - parsec-3.1.13.0
+  - quickcheck-io-0.2.0
+  - resourcet-1.1.11
+  - safe-0.3.17
+  - semigroupoids-5.2.1
+  - semigroups-0.18.5
+  - servant-0.13.0.1
+  - servant-server-0.13.0.1
+  - singleton-bool-0.1.4
+  - split-0.2.3.3
+  - string-conversions-0.4.0.1
+  - tagged-0.8.6
+  - text-1.2.3.0
+  - th-abstraction-0.2.8.0
+  - transformers-compat-0.5.1.4
+  - unix-compat-0.5.0.1
+  - unix-time-0.3.8
+  - unliftio-core-0.1.1.0
+  - vault-0.3.1.1
+  - vector-binary-instances-0.2.4
+  - vector-instances-3.4
+  - wai-extra-3.0.22.0
+  - warp-3.2.23
+  - word8-0.1.3
diff --git a/templates/base.yml b/templates/base.yml
deleted file mode 100644
index 9949bf3..0000000
--- a/templates/base.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-# Base template for all Travis jobs. The language variable can be overridden in
-# derived templates or leaf files. No env, addons, script, or anything is
-# defined in this template, because there is currently nothing that needs to be
-# done on every single build.
-language: generic
-
-# This probably shouldn't be overridden.
-branches:
-  only:
-    - master
-
-# Add elements to the special __erase__ field to remove sections that are only
-# used during generation and have no meaning to Travis.
-__erase__:
-  - __erase__
diff --git a/templates/haskell.yml b/templates/haskell.yml
deleted file mode 100644
index 1059ab6..0000000
--- a/templates/haskell.yml
+++ /dev/null
@@ -1,118 +0,0 @@
-# This is the Haskell base template. Every derived template in the end needs to
-# be derived from 'base'. The inherited template is written without its .yml
-# extension.
-inherits: base
-
-# Every Haskell leaf file needs to specify the package name and version. This
-# information is used in after_script to tell hpc-coveralls where to look for
-# the coverage data. A value of '???' is treated as an error in expansions. This
-# allows base packages to document the existence and requirement of certain
-# parameters while still forcing leaf files to actually define them rather than
-# having them be empty.
-package:
-  name: '???'
-  version: '???'
-
-# We have two separate cabal/ghc directories. The 'build' cabal is the one used
-# for the package being built as well as any user-provided cabal packages. The
-# 'tools' cabal is used for hpc-coveralls, stylish-haskell, and hlint. We keep
-# these separate because they have complicated dependencies that can (and
-# sometimes do) interfere with the actual user package we want to test. In the
-# future we may want to share the -tools directories across all repositories,
-# because they are going to end up being identical.
-cache:
-  directories:
-    - $HOME/.cabal-build
-    - $HOME/.cabal-tools
-    - $HOME/.ghc-build
-    - $HOME/.ghc-tools
-
-# This is not used by Travis, but instead the values can be used in other parts
-# of the configuration. We can't use environment variables in addons for
-# instance, so to deduplicate the numbers and allow derived templates to
-# override this value in a single place, we use dynamically scoped %% variable
-# expansions.
-haskell:
-  cabal: 1.18
-  ghc: 7.8.4
-  # Leaf files can specify extra packages (like semdoc or pandoc) to be
-  # installed in the same cabal as their package dependencies. In expansions,
-  # arrays of strings are joined with a space. E.g. [semdoc, pandoc] will end up
-  # as "semdoc pandoc" in a %haskell.packages% expansion.
-  packages: []
-  # Some tools may need to be installed in the tools cabal. They can be
-  # specified here.
-  tools: []
-
-env: CABALVER=%haskell.cabal% GHCVER=%haskell.ghc%
-addons:
-  apt:
-    sources:
-      - hvr-ghc
-    packages:
-      - alex-3.1.7
-      - happy-1.19.5
-      - cabal-install-%haskell.cabal%
-      - ghc-%haskell.ghc%
-
-# The install, script, after_script, and other shell script listings have a
-# 'before' and 'after' value. This tells the generator whether to prepend or
-# append that snippet to the inherited snippet.
-install:
-  after:
-    # We want both .cabal directories on the path, but the currently active one
-    # should have precedence. After that, the build cabal has precedence and
-    # then the tools one.
-    - export PATH=$HOME/.cabal/bin:$PATH
-    - export PATH=$HOME/.cabal-build/bin:$PATH
-    - export PATH=$HOME/.cabal-tools/bin:$PATH
-    # Put ghc, cabal, alex, and happy on the path.
-    - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:/opt/alex/3.1.7/bin:/opt/happy/1.19.5/bin:$PATH
-    # Get old cabal out of the way.
-    - rm -rf $HOME/.cabal $HOME/.ghc
-    # Update tools cabal.
-    - mkdir -p $HOME/.cabal-tools $HOME/.ghc-tools
-    - rm -f $HOME/.cabal && ln -s $HOME/.cabal-tools $HOME/.cabal
-    - rm -f $HOME/.ghc && ln -s $HOME/.ghc-tools $HOME/.ghc
-    - cabal update
-    # Update build cabal.
-    - mkdir -p $HOME/.cabal-build $HOME/.ghc-build
-    - rm -f $HOME/.cabal && ln -s $HOME/.cabal-build $HOME/.cabal
-    - rm -f $HOME/.ghc && ln -s $HOME/.ghc-build $HOME/.ghc
-    - cabal update
-
-script:
-  after:
-    # Install common tools separately in the tools directory, because they have
-    # incompatible dependencies.
-    - rm -f $HOME/.cabal && ln -s $HOME/.cabal-tools $HOME/.cabal
-    - rm -f $HOME/.ghc && ln -s $HOME/.ghc-tools $HOME/.ghc
-    - cabal install hpc-coveralls stylish-haskell hlint yaml-0.8.27 aeson-0.9.0.1 %haskell.tools%
-    - curl https://raw.githubusercontent.com/TokTok/toktok-stack/master/tools/stylish-haskell-lhs -o $HOME/.cabal/bin/stylish-haskell-lhs
-    - chmod +x $HOME/.cabal/bin/stylish-haskell-lhs
-    # Do the style checks.
-    - hlint .
-    - stylish-haskell-lhs -i .
-    # Check that stylish-haskell had no effect.
-    - git diff --exit-code
-    # Install package dependencies in the build cabal.
-    - rm -f $HOME/.cabal && ln -s $HOME/.cabal-build $HOME/.cabal
-    - rm -f $HOME/.ghc && ln -s $HOME/.ghc-build $HOME/.ghc
-    - cabal install --enable-tests --enable-benchmarks --only-dependencies ./ %haskell.packages%
-    - if [ -n "%haskell.packages%" ]; then cabal install %haskell.packages%; fi
-    # Now to the actual build.
-    - cabal configure --enable-tests --enable-benchmarks --enable-library-coverage
-    - travis_wait cabal test
-    - cabal check
-
-after_script:
-  after:
-    # hpc-coveralls is in the tools cabal.
-    - rm -f $HOME/.cabal && ln -s $HOME/.cabal-tools $HOME/.cabal
-    - rm -f $HOME/.ghc && ln -s $HOME/.ghc-tools $HOME/.ghc
-    - hpc-coveralls %package.name%-%package.version%
-
-# Erase fields only used by the Haskell template.
-__erase__:
-  - haskell
-  - package
diff --git a/tools/expand-yaml b/tools/expand-yaml
deleted file mode 100755
index 407a4b4..0000000
--- a/tools/expand-yaml
+++ /dev/null
@@ -1,184 +0,0 @@
-#!/usr/bin/env perl
-
-use strict;
-use warnings FATAL => 'all';
-use utf8;
-
-use Cwd 'abs_path';
-use Data::Dumper;
-use Dir::Self;
-use File::Basename;
-use YAML::XS qw/LoadFile DumpFile/;
-
-local $Data::Dumper::Indent   = 1;
-local $Data::Dumper::Sortkeys = 1;
-local $Data::Dumper::Terse    = 1;
-
-my $TEMPLATES = __DIR__ . '/../templates';
-
-# Recursively load files and replace 'inherits' fields with the actual parsed
-# file contents.
-sub load_file {
-   my ($input) = @_;
-   return unless -f $input;
-   my $leaf = LoadFile $input;
-
-   if ($leaf->{inherits}) {
-      $leaf->{inherits} = do {
-         my $local_dir = dirname $input;
-         0  or load_file("$local_dir/$leaf->{inherits}.yml")
-            or load_file("$TEMPLATES/$leaf->{inherits}.yml");
-      };
-   }
-
-   $leaf
-}
-
-sub check_type {
-   my ($name, $a, $b) = @_;
-   if (defined $a and defined $b) {
-      my $aref = ref $a;
-      my $bref = ref $b;
-      if ($aref ne $bref) {
-         die "type of $name is '$aref' in derived data but '$bref' in inherited";
-      }
-   }
-}
-
-# Recursively merge two data structures. The two parameters are expected to be
-# hash references.
-sub recursive_merge {
-   my ($dst, $src) = @_;
-   check_type 'value', $dst, $src;
-   for my $field (sort keys %$src) {
-      check_type $field, $dst->{$field}, $src->{$field};
-
-      for (ref $src->{$field}) {
-         if ($_ eq 'HASH') {
-            if (exists $dst->{$field}) {
-               recursive_merge($dst->{$field}, $src->{$field});
-            } else {
-               $dst->{$field} = $src->{$field};
-            }
-         } elsif ($_ eq 'ARRAY') {
-            if ($field eq 'after') {
-               unshift @{ $dst->{$field} }, @{ $src->{$field} };
-            } else {
-               push @{ $dst->{$field} }, @{ $src->{$field} };
-            }
-         } elsif ($_ eq '') {
-            $dst->{$field} //= $src->{$field};
-         } else {
-            die "unhandled ref type: $_";
-         }
-      }
-   }
-}
-
-# Merge the inherited templates into one. This starts from the leaf and fills in
-# all fields that are not yet set. Also, 'before' and 'after' fields are
-# concatenated such that the inherited 'before' comes after the derived one, and
-# the inherited 'after' comes before the derived one.
-#
-# Inheritance is resolved depth-first. I.e. the deepest level is merged first,
-# and the leaf is merged last.
-sub process_inherits {
-   my ($data) = @_;
-
-   if (my $parent = delete $data->{inherits}) {
-      process_inherits($parent);
-
-      # At this point, $parent is fully merged.
-      recursive_merge($data, $parent);
-   }
-}
-
-sub process_expansions {
-   my ($data, $cur) = @_;
-
-   for (ref $cur) {
-      if ($_ eq 'HASH') {
-         for my $k (keys %$cur) {
-            $cur->{$k} = process_expansions($data, $cur->{$k});
-         }
-      } elsif ($_ eq 'ARRAY') {
-         for my $i (0 .. $#$cur) {
-            $cur->[$i] = process_expansions($data, $cur->[$i]);
-         }
-      } elsif ($_ eq '') {
-         if (my @expansions = $cur =~ /%([^%]+)%/g) {
-            # Perform lookups and collect actual values.
-            @expansions = map {
-               my @path = split /\./;
-               my $v = $data;
-               for my $p (@path) {
-                  die "could not resolve '$_'"
-                     unless exists $v->{$p};
-                  $v = $v->{$p};
-                  die "variable '$_' has value '???', which means it must be overridden"
-                     if $v eq '???';
-               }
-
-               if (ref $v eq 'HASH') {
-                  die "'$_' expanded to an object and can't be interpolated"
-               } elsif (ref $v eq 'ARRAY') {
-                  join ' ', @$v
-               } elsif (ref $v eq '') {
-                  $v
-               } else {
-                  die "'$_' expanded to an object of unknown type: " . ref $v
-               }
-            } @expansions;
-
-            # Perform the actual text replacements.
-            for my $text (@expansions) {
-               $cur =~ s/%([^%]+)%/$text/;
-            }
-
-            # Strip resulting text of leading and trailing whitespace.
-            $cur =~ s/^\s+//;
-            $cur =~ s/\s+$//;
-         }
-      } else {
-         die "unhandled type: '$_'"
-      }
-   }
-
-   $cur
-}
-
-sub process_before_after {
-   my ($data) = @_;
-
-   for my $k (keys %$data) {
-      my $v = $data->{$k};
-      if (ref $v eq 'HASH' and (exists $v->{before} or exists $v->{after})) {
-         $data->{$k} = [
-            @{ $v->{before} || [] },
-            @{ $v->{after} || [] },
-         ];
-      }
-   }
-}
-
-sub process_erase {
-   my ($data) = @_;
-
-   for my $k (@{ $data->{__erase__} }) {
-     delete $data->{$k};
-   }
-}
-
-my ($input, $output) = @ARGV;
-$input and $output or die "Usage: expand-yaml <input.yml> <output.yml>";
-
-my $data = load_file (abs_path $input);
-process_inherits $data;
-process_expansions $data, $data;
-process_before_after $data;
-process_erase $data;
-
-open my $outfh, '>', $output or die "Cannot open $output for writing: $!";
-print $outfh "# DO NOT EDIT: This file was generated using the following command:\n";
-print $outfh "# $0 @ARGV\n";
-DumpFile $outfh, $data;