feat(revamp): add zsh and neovim configs, add an install script and a dependencies list

config/zsh/.zprezto/modules/haskell/README.md

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+# Haskell
+
+Enables local Haskell package installation.
+
+## Per-user Package Installation
+
+[Cabal][1], the Haskell package manager, can install packages into per user
+directories.
+
+This module prepends per user directories to the relevant path variables to
+enable the execution of user installed executables and the reading of
+documentation.
+
+### Usage
+
+Install packages into per user directories with `cabal install --user`.
+
+## Authors
+
+_The authors of this module should be contacted via the [issue tracker][2]._
+
+- [Sebastian Wiesner](https://github.com/lunaryorn)
+
+[1]: https://www.haskell.org/cabal/
+[2]: https://github.com/sorin-ionescu/prezto/issues

config/zsh/.zprezto/modules/haskell/init.zsh

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+#
+# Enables local Haskell package installation.
+#
+# Authors:
+#   Sebastian Wiesner <lunaryorn@googlemail.com>
+#
+
+# Return if requirements are not found.
+if (( ! $+commands[ghc] )); then
+  return 1
+fi
+
+# Load dependencies.
+pmodload 'helper'
+
+# Prepend Cabal per user directories to PATH.
+if is-darwin && [[  -d $HOME/Library/Haskell ]]; then
+  path=($HOME/Library/Haskell/bin(/N) $path)
+else
+  path=($HOME/.cabal/bin(/N) $path)
+fi