Start using pyenv

This required a significant refactor to shellenv.sh. Some strange, and
not yet fully understood behavior of add_to_path was uncovered in doing
this refactoring. More investigation is needed.

dotfiles/cider/bootstrap.json

@@ -135,6 +135,7 @@
     "plantuml",
     "pstree",
     "pv",
+    "pyenv",
     "pypy",
     "python",
     "python3",

dotfiles/lib/python/shell_path.py

@@ -31,6 +31,17 @@ class PathList(object):
         )
 
     def add(self, new_paths, after=False, target=None):
+
+        # Remove the path if it already exists in self.paths to ensure
+        # that the new placement takes precedence
+        for path in new_paths:
+            done = False
+            while not done:
+                try:
+                    self.paths.remove(path)
+                except:
+                    done = True
+
         if target:
             target_index = self.paths.index(target)
         else:

dotfiles/lib/shellenv.sh

@@ -19,18 +19,72 @@ function get_python_scripts_path {
 
 function _setup_env {
     _path_helper
-    hash brew 2>/dev/null && add_to_path "$(brew --prefix coreutils)/libexec/gnubin"
-    add_to_path /usr/local/lib/python2.7/site-packages --after
-    add_to_path "$HOME/bin"
-    hash brew 2>/dev/null && add_to_path --before "$(brew --prefix coreutils)/libexec/gnubin"
+
     add_to_path "/usr/local/bin"
 
-    add_to_path "$(get_python_scripts_path)" --before
+    is_osx && _osx_path_setup
+    _java_setup
+    _go_setup
+    _rust_setup
+    _tex_setup
 
+    add_to_path "/usr/local/sbin" --after
+    add_to_path "$HOME/.local/bin"
+    add_to_path "$HOME/.lib/bin"
+
+    # Travis completion
+    [ -f "$HOME/.travis/travis.sh" ] && source "$HOME/.travis/travis.sh"
+
+    export ENVIRONMENT_SETUP_DONE="$(date)"
+}
+
+function _osx_path_setup {
+    # What is going on here? Why does /libexec/gnubin get added twice
+    hash brew 2>/dev/null && add_to_path "$(brew --prefix coreutils)/libexec/gnubin"
+    add_to_path "$HOME/bin"
+    hash brew 2>/dev/null && add_to_path --before "$(brew --prefix coreutils)/libexec/gnubin"
+
+    # Adds airport utility
+    add_to_path "/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources" --after
+
+    # I believe that this is here because of some issue with
+    # python builds in OSX
+    export CFLAGS=-Qunused-arguments
+    export CPPFLAGS=-Qunused-arguments
+}
+
+function _python_setup {
+    add_to_path "$HOME/.lib/python" --after
+    export PYENV_ROOT="/usr/local/var/pyenv"
+
+    if which pyenv > /dev/null; then
+        local PYENV_INIT_COMMANDS="$(pyenv init -)"
+        echo "$PYENV_INIT_COMMANDS"
+        eval "$PYENV_INIT_COMMANDS"
+    else
+        echo "WARNING: pyenv is installed on this machine and python will likely not function correctly"
+    fi
+
+    # The following line is no longer necessary since the pyenv shim
+    # should handle directing to the appropriate install.
+
+    # add_to_path "$(get_python_scripts_path)" --before
+
+    add_to_path "$HOME/.lib/python" --path-var 'PYTHONPATH'
+
+    # This should no longer be needed now that pyenv is used
+    # add_to_path /usr/local/lib/python2.7/site-packages --after
+}
+
+function _node_setup {
+    # node/nvm
+    export NVM_DIR="/Users/imalison/.nvm"
+    [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
+    export NODE_PATH="/usr/local/lib/node_modules/"
+}
+
+function _java_setup {
     if is_osx; then
-        export CFLAGS=-Qunused-arguments
-        export CPPFLAGS=-Qunused-arguments
-        add_to_path "/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources" --after
         local JDK_LOCATION="$(find /Library/Java/JavaVirtualMachines -depth 1 | head -n 1)"
         export JAVA_HOME="$JDK_LOCATION/Contents/Home"
         export STUDIO_JDK=$JDK_LOCATION
@@ -40,51 +94,35 @@ function _setup_env {
         
         # Access gnu man pages.
         hash brew 2> /dev/null && export MANPATH="$(brew --prefix)/opt/coreutils/libexec/gnuman:$MANPATH"
-    else 
+    else
+        # This may be ubuntu/debian specific
         export JAVA_HOME="$(update-alternatives --config java | get_cols ' -1' | head -n 1)"
         is_osx && export VISUAL="which emacsclient -c -n"
     fi
 
     add_to_path "$JAVA_HOME/bin"
+}
 
-    add_to_path "$HOME/.lib/python" --after
-    add_to_path "/usr/local/sbin" --after
-
-    function with_shellrc {
-        zsh -c "source ~/.zshrc && ""$@"
-    }
-
-    # node/nvm
-    export NVM_DIR="/Users/imalison/.nvm"
-    [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
-    export NODE_PATH="/usr/local/lib/node_modules/"
-
-    add_to_path "$HOME/.local/bin"
-    add_to_path "$HOME/.lib/python" --path-var 'PYTHONPATH'
-
-    # golang
+function _go_setup {
     add_to_path "$HOME/go" --path-var 'GOPATH'
     add_to_path "${GOPATH//://bin:}/bin"
+}
 
-    # ruby
+function _rust_setup {
+    add_to_path "$HOME/.cargo/bin"
+}
+
+function _ruby_setup {
     # Load RVM into a shell session *as a function*
     [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
     export RBENV_ROOT=/usr/local/var/rbenv
     add_to_path "$HOME/.rbenv/bin"
     add_to_path "$HOME/.rvm/bin" --after
     hash rbenv 2> /dev/null && eval "$(rbenv init -)"
+}
 
-    # rust
-    add_to_path "$HOME/.cargo/bin"
-
-    # tex
+function _tex_setup {
     is_osx && add_to_path "/Library/TeX/texbin/"
-
-    # Travis completion
-    [ -f "$HOME/.travis/travis.sh" ] && source "$HOME/.travis/travis.sh"
-
-    add_to_path "$HOME/.lib/bin"
-    export ENVIRONMENT_SETUP_DONE="$(date)"
 }
 
 function _path_helper {
@@ -97,4 +135,13 @@ function _path_helper {
 
 environment_variable_exists PATH_HELPER_RAN || _path_helper
 environment_variable_exists ENVIRONMENT_SETUP_DONE || _setup_env
+
+# TODO(imalison): These need to run every time because of how their
+# version managers work. This could cause problems with the situation
+# where we want to intentionally override the python/ruby/node
+# versions in use in a given shell.
+_node_setup
+_ruby_setup
+_python_setup
+
 _source_shellenv_files