Add plugin-pyenv as an available function for fish

README.md

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+
+<img src="https://cdn.rawgit.com/oh-my-fish/oh-my-fish/e4f1c2e0219a17e2c748b824004c8d0b38055c16/docs/logo.svg" align="left" width="144px" height="144px"/>
+
+# Pyenv Plugin for Fish Shell
+Use [Pyenv](https://github.com/pyenv/pyenv) with [fish shell](https://fishshell.com) managed by [Oh my fish](https://github.com/oh-my-fish/oh-my-fish) in a very simple way!
+
+<br />
+<br />
+
+## Installation
+
+```fish
+omf update  # Just if your omf installation is old. Avoids missing the package
+omf install pyenv
+```
+> omf (Oh my fish) is a package manager for fish shell. Just like pip is for Python and gem is for Ruby
+
+## Usage
+
+Just add the following line in your ```config.fish``` file:
+
+```fish
+# Initializes Pyenv
+pyenv-init
+```
+
+This will initialize pyenv every time a new Fish session starts.
+And that is all!

functions/pyenv-init.fish

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+
+function pyenv-init --description "Pyenv initialization script for fish shell"
+
+    # Checks if directories already exists. If not, creates then
+    for dir in "shims" "bin"
+        if not test -d $HOME/pyenv/$dir
+            mkdir -p $HOME/pyenv/$dir
+        end
+    end
+
+    # Respects if PYENV_ROOT exists. Otherwise, sets it to a default directory
+    set --query PYENV_ROOT; or set --local PYENV_ROOT $HOME/.pyenv
+
+    # Appends PYENV_ROOT directories to PATH variable
+    set PATH $PYENV_ROOT/shims $PYENV_ROOT/bin $PATH
+end