commands: fast path for --sh, replace sort|uniq with sort -u (#3423)

libexec/pyenv-commands

@@ -3,19 +3,19 @@
 # Usage: pyenv commands [--sh|--no-sh]
 
 set -e
-[ -n "$PYENV_DEBUG" ] && set -x
+[[ -n $PYENV_DEBUG ]] && set -x
 
 # Provide pyenv completions
-if [ "$1" = "--complete" ]; then
+if [[ $1 = "--complete" ]]; then
   echo --sh
   echo --no-sh
   exit
 fi
 
-if [ "$1" = "--sh" ]; then
+if [[ $1 = "--sh" ]]; then
   sh=1
   shift
-elif [ "$1" = "--no-sh" ]; then
+elif [[ $1 = "--no-sh" ]]; then
   nosh=1
   shift
 fi
@@ -24,20 +24,25 @@ IFS=: paths=($PATH)
 
 shopt -s nullglob
 
-{ for path in "${paths[@]}"; do
-    for command in "${path}/pyenv-"*; do
-      command="${command##*pyenv-}"
-      if [ -n "$sh" ]; then
-        if [ "${command:0:3}" = "sh-" ]; then
-          echo "${command##sh-}"
-        fi
-      elif [ -n "$nosh" ]; then
-        if [ "${command:0:3}" != "sh-" ]; then
+{ 
+  if [[ -n $sh ]]; then
+    for path in "${paths[@]}"; do
+      for command in "${path}"/pyenv-sh-*; do
+        echo "${command##*/pyenv-sh-}"
+      done
+    done
+  else
+    for path in "${paths[@]}"; do
+      for command in "${path}"/pyenv-*; do
+        command="${command##*/pyenv-}"
+        if [[ -n $nosh ]]; then
+          if [[ ${command:0:3} != "sh-" ]]; then
+            echo "$command"
+          fi
+        else
           echo "${command##sh-}"
         fi
-      else
-        echo "${command##sh-}"
-      fi
+      done
     done
-  done
-} | sort | uniq
+  fi
+} | sort -u