Add plugin for pipenv (#6698)

- Add completion for pipenv
- Auto activate and deactivate for pipenv shell
- Add aliases for the most common pipenv commands

plugins/pipenv/pipenv.plugin.zsh

@@ -0,0 +1,42 @@
+# Pipenv completion
+_pipenv() {
+  eval $(env COMMANDLINE="${words[1,$CURRENT]}" _PIPENV_COMPLETE=complete-zsh  pipenv)
+}
+compdef _pipenv pipenv
+
+# Automatic pipenv shell activation/deactivation
+_togglePipenvShell() {
+  # deactivate shell if Pipfile doesn't exist and not in a subdir
+  if [[ ! -a "$PWD/Pipfile" ]]; then
+    if [[ "$PIPENV_ACTIVE" == 1 ]]; then
+      if [[ "$PWD" != "$pipfile_dir"* ]]; then
+        exit
+      fi
+    fi
+  fi
+
+  # activate the shell if Pipfile exists
+  if [[ "$PIPENV_ACTIVE" != 1 ]]; then
+    if [[ -a "$PWD/Pipfile" ]]; then
+      export pipfile_dir="$PWD"
+      pipenv shell
+    fi
+  fi
+}
+chpwd_functions+=(_togglePipenvShell)
+
+# Aliases
+alias pch="pipenv check"
+alias pcl="pipenv clean"
+alias pgr="pipenv graph"
+alias pi="pipenv install"
+alias pidev="pipenv install --dev"
+alias pl="pipenv lock"
+alias po="pipenv open"
+alias prun="pipenv run"
+alias psh="pipenv shell"
+alias psy="pipenv sync"
+alias pu="pipenv uninstall"
+alias pwh="pipenv --where"
+alias pvenv="pipenv --venv"
+alias ppy="pipenv --py"