# usage: source hacking/env-setup [-q]

 #    modifies environment for running Ansible from checkout

 # prepend a value to a potentially empty path variable
 # usage: prepend_path variable_name value
 prepend_path()
 {
     variable_name="$1"
     value="$2"
 
     old_value=$( eval "echo \$$variable_name" )
 
     if [ "x$old_value" != "x" ]; then
         value="$value:"
     fi
 
     export "$variable_name=$value$old_value"
 }
 

 # Default values for shell variables we use
 PYTHONPATH=${PYTHONPATH-""}
 PATH=${PATH-""}

 MANPATH=${MANPATH-$(manpath)}

 PYTHON=$(which python 2>/dev/null || which python3 2>/dev/null)
 PYTHON_BIN=${PYTHON_BIN-$PYTHON}
 

 verbosity=${1-info} # Defaults to `info' if unspecified
 
 if [ "$verbosity" = -q ]; then
     verbosity=silent
 fi

 # When run using source as directed, $0 gets set to bash, so we must use $BASH_SOURCE

 if [ -n "$BASH_SOURCE" ] ; then

     HACKING_DIR=$(dirname "$BASH_SOURCE")

 elif [ $(basename -- "$0") = "env-setup" ]; then

     HACKING_DIR=$(dirname "$0")

 # Works with ksh93 but not pdksh, have to eval to keep ash happy...

 elif [ -n "$KSH_VERSION" ] && echo $KSH_VERSION | grep -qv '^@(#)PD KSH'; then

     eval "HACKING_DIR=\$(dirname \"\${.sh.file}\")"

 else
     HACKING_DIR="$PWD/hacking"
 fi

 # The below is an alternative to readlink -fn which doesn't exist on macOS

 # Source: http://stackoverflow.com/a/1678636

 FULL_PATH=$($PYTHON_BIN -c "import os; print(os.path.realpath('$HACKING_DIR'))")

 export ANSIBLE_HOME="$(dirname "$FULL_PATH")"

 
 PREFIX_PYTHONPATH="$ANSIBLE_HOME/lib"

 PREFIX_PATH="$ANSIBLE_HOME/bin"

 PREFIX_MANPATH="$ANSIBLE_HOME/docs/man"

 expr "$PYTHONPATH" : "${PREFIX_PYTHONPATH}.*" > /dev/null || prepend_path PYTHONPATH "$PREFIX_PYTHONPATH"
 expr "$PATH" : "${PREFIX_PATH}.*" > /dev/null || prepend_path PATH "$PREFIX_PATH"
 expr "$MANPATH" : "${PREFIX_MANPATH}.*" > /dev/null || prepend_path MANPATH "$PREFIX_MANPATH"

 #
 # Generate egg_info so that pkg_resources works
 #
 
 # Do the work in a function so we don't repeat ourselves later
 gen_egg_info()
 {

     # check for current and past egg-info directory names
     if ls "$PREFIX_PYTHONPATH"/ansible*.egg-info >/dev/null 2>&1; then
         # bypass shell aliases with leading backslash
         # see https://github.com/ansible/ansible/pull/11967
         \rm -rf "$PREFIX_PYTHONPATH"/ansible*.egg-info

     fi

     $PYTHON_BIN setup.py egg_info

 }
 
 if [ "$ANSIBLE_HOME" != "$PWD" ] ; then

     current_dir="$PWD"

 else

     current_dir="$ANSIBLE_HOME"

 fi

 (
 	cd "$ANSIBLE_HOME"
 	if [ "$verbosity" = silent ] ; then

 	    gen_egg_info > /dev/null 2>&1 &

             find . -type f -name "*.pyc" -exec rm -f {} \; > /dev/null 2>&1

 	else
 	    gen_egg_info

             find . -type f -name "*.pyc" -exec rm -f {} \;

 	fi
 	cd "$current_dir"
 )

 if [ "$verbosity" != silent ] ; then

     cat <<- EOF

 	Setting up Ansible to run out of checkout...

 	PATH=$PATH
 	PYTHONPATH=$PYTHONPATH
 	MANPATH=$MANPATH

 	Remember, you may wish to specify your host file with -i

 	Done!

 	EOF

 fi