Add autoenv command to manage autoenv's

usage: autoenv [-h] {init,edit,deinit}

options:
        -h, --help  show this help message and exit

commands:
        init        add .enter and .exit scripts in current directory
        edit        edit .enter and .exit scripts in current directory
        deinit      remove .enter and .exit scripts in current directory

autoenv/autoenv.zsh

@@ -2,8 +2,8 @@
 # changes, this is a reimplementation of the ideas found in the repository
 # https://github.com/Tarrasch/zsh-autoenv stripped down to bare essentials.
 #
-# The secret sauce can be found at the bottom of this file, where the chpwd
-# hook function _autoenv_chpwd is added.
+# The secret sauce can be found at the bottom of this file, where the `chpwd`
+# hook function `_autoenv_chpwd` is added.
 
 # The autoenv command provides a convenient way to create, edit, and remove
 # enter and exit scripts in the current directory.
@@ -29,12 +29,19 @@ commands:
       fi
       # Create then edit enter and exit scripts.
       touch .enter .exit && autoenv edit
+      # Load the authorized file into a map of authorized key value pairs.
+      typeset -A authorized=(`cat ~/.cache/autoenv/authorized`)
       # If enter script exists, authorize it.
-      [ -f $PWD/.enter ] && _autoenv_authorized $PWD/.enter yes
+      [ -f $PWD/.enter ] && \
+        authorized[$PWD/.enter]=`zstat +mtime $PWD/.enter`
       # If exit script exists, authorize it.
-      [ -f $PWD/.exit ] && _autoenv_authorized $PWD/.exit yes
+      [ -f $PWD/.exit ] && \
+        authorized[$PWD/.exit]=`zstat +mtime $PWD/.exit`
+      # Store authorized map in authorized file.
+      echo ${(kv)authorized} > ~/.cache/autoenv/authorized
       # Enter the new autoenv.
-      _autoenv_enter $PWD ;;
+      _autoenv_enter $PWD
+      ;;
 
     edit)  # Edit enter and exit scripts in current directory.
       if ! [ -f $PWD/.enter ] || ! [ -f $PWD/.exit ]; then
@@ -54,10 +61,10 @@ commands:
           read "answer?Are you sure [y/N]? "
           case "$answer" in
             y|Y|yes)
-              # Remove enter and exit scripts if they exist.
+              # Remove enter and exit scripts.
               [ -f $PWD/.enter ] && rm $PWD/.enter
               [ -f $PWD/.exit ] && rm $PWD/.exit
-              break ;;
+              ;;
             *) break ;;
           esac
         done
@@ -69,46 +76,41 @@ commands:
       echo "invalid arguments: $@"
       autoenv --help
       return 1 ;;
+
   esac
 }
 
 # Global entered directories array.
 _autoenv_entered=()
+# If autoenv cache directory does not exist, create it.
+! [ -d ~/.cache/autoenv ] && mkdir -p ~/.cache/autoenv
+# If the authorized file does not exist, create it.
+! [ -f ~/.cache/autoenv/authorized ] && touch ~/.cache/autoenv/authorized
 
 # Check if the given file is authorized, if not prompt the user to authorize,
 # ignore, or view the file. Authorized files and their modified times are
 # stored in the ~/.cache/autoenv/authorized file to make authorization
 # persistent.
 _autoenv_authorized() {
-  local file=$1 yes=$2
-  # If autoenv cache directory does not exist, create it.
-  ! [ -d ~/.cache/autoenv ] && mkdir -p ~/.cache/autoenv
-  # If the authorized file does not exist, create it.
-  ! [ -f ~/.cache/autoenv/authorized ] && touch ~/.cache/autoenv/authorized
+  local file=$1
   # Load the authorized file into a map of authorized key value pairs.
   typeset -A authorized=(`cat ~/.cache/autoenv/authorized`)
-  # If the file has been removed, return.
-  ! [ -f $file ] && return 1
   # If the given file has been authorized, i.e. the modified time matches that
   # held in the authorized file, return.
   local modified_time=`zstat +mtime $file`
   [ "$authorized[$file]" = "$modified_time" ] && return
-  # If yes, don't prompt for user confirmation.
-  if [ "$yes" != "yes" ]; then
-    # Prompt to authorize file.
-    while true; do
-      read "answer?Authorize $file [Y/n/v]? "
-      case "$answer" in
-        y|Y|yes|'') break ;;    # Authorize the file.
-        n|N|no) return 1 ;;     # Do not authorize the file.
-        v|V|view) cat $file ;;  # View the file.
-      esac
-    done
-  fi
-  # Add file to the authorized map.
-  authorized[$file]=$modified_time
+  # Prompt to authorize file.
+  while true; do
+    read "answer?Authorize $file [Y/n/v]? "
+    case "$answer" in
+      y|Y|yes|'')             # Authorize the file.
+        authorized[$file]=$modified_time; break ;;
+      n|N|no) return 1 ;;     # Do not authorize the file.
+      v|V|view) cat $file ;;  # View the file.
+    esac
+  done
   # Store authorized map in authorized file.
-  echo ${(kv)authorized} > ~/.cache/autoenv/authorized
+  echo ${(kv)authorized} > $authorized_file
 }
 
 # Source an enter script and add its directory to the global entered