applied fix to mac os to make it possible to install which was broken

.gitignore

@@ -1 +1,2 @@
 .*.s[a-w][a-z]
+.idea

evm

@@ -14,7 +14,7 @@ else
   EVM_PS_SHELL="$SHELL"
 fi
 
-VERSION="5.0.2"
+VERSION="5.0.3"
 ERLANG_ORG="http://www.erlang.org/download/"
 ERLANG_URL="https://github.com"
 FILE_PATH="/erlang/otp/archive/OTP-"
@@ -125,27 +125,59 @@ function _unzip_strip() {
   # shopt is a bash built-in command. Zsh, has setopt instead
   # so, set the command according to the type of shell (only supports bash and zsh)
   local SHOPT="shopt"
-  if [[ "$EVM_PS_SHELL" == *zsh ]]; then
+  if [[ "$EVM_PS_SHELL" == *zsh ]] || [[  "$(which $SHELL)" == *"/zsh" ]] ; then
     SHOPT="setopt"
   fi
 
   local zip="$1"
   local dest="${2:-.}"
-  local temp=$(mktemp -d) 
-
+  local -i _err=0
+  local temp=$(mktemp -d)
+  _err=$?
+  if [ ${_err} -ne 0 ] ; then
+    return ${_err}
+  fi
   unzip -d "$temp" "$zip"
-  mkdir -p "$dest" 
-  $SHOPT -s dotglob 
+  _err=$?
+  if [ ${_err} -ne 0 ] ; then
+    return ${_err}
+  fi
+  mkdir -p "$dest"
+  _err=$?
+  if [ ${_err} -ne 0 ] ; then
+    return ${_err}
+  fi
+  $SHOPT -s dotglob
+  _err=$?
+  if [ ${_err} -ne 0 ] ; then
+    return ${_err}
+  fi
   local f=("$temp"/*)
-
-  if (( ${#f[@]} == 1 )) && [[ -d "${f[0]}" ]] ; then
-    mv "$temp"/*/* "$dest"
-  else
-    mv "$temp"/* "$dest"
-  fi 
-
-  rm -rf "$temp"
-}
+  _err=$?
+  if [ ${_err} -ne 0 ] ; then
+    return ${_err}
+  fi
+
+    if (( ${#f[@]} == 1 )) && [[ -d "${f[0]}" ]] ; then
+      mv "$temp"/*/* "$dest"
+      _err=$?
+      if [ ${_err} -ne 0 ] ; then
+        return ${_err}
+      fi
+
+    else
+      mv "$temp"/* "$dest"
+      _err=$?
+      if [ ${_err} -ne 0 ] ; then
+        return ${_err}
+      fi
+    fi
+    rm -rf "$temp"
+    _err=$?
+    if [ ${_err} -ne 0 ] ; then
+      return ${_err}
+    fi
+} # end _unzip_strip
 
 
 # This function will download the erlang version if needed,
@@ -193,28 +225,56 @@ function evm_install() {
     # tar xvzf ~/.evm/erlang_tars/otp_src_R15B03-1.tar.gz --strip-components 1 -C otp_src_R15B03-1
     local UNTAR_DIR=$DEFAULT_TAR_LOCATION$FOLDER_PREFIX$VER
     mkdir $UNTAR_DIR
+    # PARENT_COMMAND=$(ps -o comm= $PPID)
+    # >&2  echo PWD:$(PWD) PARENT_COMMAND:${PARENT_COMMAND} > $HOME/evm.log
+    local -i _err=0
     _unzip_strip $DEFAULT_TAR_LOCATION$FILE_PREFIX$VER$FILE_EXTENSION $UNTAR_DIR
-
+    _err=$?
+    if [ ${_err} -ne 0 ] ; then
+      echo "There was an error unzipping ... $UNTAR_DIR"
+      exit 1
+    fi
     echo "Configuring... $UNTAR_DIR"
+    _err=0
 
     # In zshell or other systems, the contents of the zip file
     # are expanded inside a new directory in the destination,
     # so we need to check whether there's one single entry in the destination
     # or multiple and cd into the right place
     if [ $(ls -1 $UNTAR_DIR | wc -l) -gt 1 ]; then
       cd $UNTAR_DIR
+      _err=$?
     else
       cd $UNTAR_DIR/* # CD into the new subdirectory
+      _err=$?
+    fi
+    if [ ${_err} -ne 0 ] ; then
+      echo "There was an error going to directory unzipped ... $UNTAR_DIR"
+      exit 1
     fi
 
     local INSTALL_DIR="$DEFAULT_INSTALL_LOCATION$FOLDER_PREFIX$VER"
     # Sanitize extra parameters. Extra spaces break configure
     # Multiple spaces becomes one space and spaces from begining of string are removed.
     EXTRA="$(echo "$EXTRA" | sed -E 's/[[:blank:]]+/ /g;s/^[[:blank:]]+//g')"
     chmod +X otp_build
+    _err=$?
+    if [ ${_err} -ne 0 ] ; then
+      echo "There was an error calling ... .chmod +X otp_build "
+      exit 1
+    fi
     ./otp_build autoconf # To generate the configure file
+    _err=$?
+    if [ ${_err} -ne 0 ] ; then
+      echo "There was an error calling ... ./otp_build autoconf "
+      exit 1
+    fi
     ./configure --prefix="$INSTALL_DIR" $EXTRA
-
+    _err=$?
+    if [ ${_err} -ne 0 ] ; then
+      echo "There was an error calling ... ./configure --prefix="$INSTALL_DIR" $EXTRA"
+      exit 1
+    fi
     # Block execution so the user can check if any dependency is missing
     # before continue with installation unless '-y' is passed along
     # with evm install command
@@ -607,7 +667,7 @@ function evm() {
 _load
 
 ## Setup autocomplete
-if [[ "$EVM_PS_SHELL" == *zsh ]]; then
+if [[ "$EVM_PS_SHELL" == *zsh ]]  || [[  "$(which $SHELL)" == *"/zsh" ]] ; then
   autoload bashcompinit
   bashcompinit
 fi
@@ -622,14 +682,14 @@ function _evm_complete() {
   # DEBUG >&2 echo "ps:;$(ps | grep $$)"
   # DEBUG >&2 echo "EVM_PS_SHELL:;${EVM_PS_SHELL}"
   # DEBUG >&2 echo "who:;${0}"
-  if [[ "$EVM_PS_SHELL" == *bash ]] ; then
+  if [[ "$EVM_PS_SHELL" == *bash ]]  || [[  "$(which $SHELL)" == *"/bash" ]] ; then
     # DEBUG >&2 echo "COMP_CWORD:;${COMP_CWORD};"
     i_comp_cword=$COMP_CWORD
     COMPREPLY=()
     # DEBUG >&2 echo "COMP_WORDS:;${COMP_WORDS};"
     cur=${COMP_WORDS[i_comp_cword]}
     prev=${COMP_WORDS[i_comp_cword-1]}
-  elif [[ "$EVM_PS_SHELL" == *zsh ]] ; then
+  elif [[ "$EVM_PS_SHELL" == *zsh ]]  || [[  "$(which $SHELL)" == *"/zsh" ]] ; then
     # DEBUG >&2 echo "CURRENT:;${CURRENT};"
     # DEBUG >&2 echo "words:;${words};"
     # DEBUG >&2 echo "curcontext:;${curcontext};"
@@ -643,7 +703,7 @@ function _evm_complete() {
   # DEBUG >&2 echo "cur:;${cur};"
   # DEBUG >&2 echo "prev:;${prev};"
 
-  if [[ "$EVM_PS_SHELL" == *bash ]] ; then
+  if [[ "$EVM_PS_SHELL" == *bash ]]  || [[  "$(which $SHELL)" == *"/bash" ]] ; then
     # shellcheck disable=SC2086
     if [ ${i_comp_cword} -eq 1 ] ; then
       # DEBUG >&2 echo "bash true 01"
@@ -684,7 +744,7 @@ function _evm_complete() {
           ;;
       esac
     fi
-  elif [[ "$EVM_PS_SHELL" == *zsh ]] ; then
+  elif [[ "$EVM_PS_SHELL" == *zsh ]]  || [[  "$(which $SHELL)" == *"/zsh" ]] ; then
     # shellcheck disable=SC2086
     if [ ${i_comp_cword} -eq 1 ] ; then
       # DEBUG >&2 echo "zsh true 01"