Use `${PWD}` instead of `$(pwd)`

Don't subshell when there's a shell parameter for it.

completion/available/hub.completion.bash

@@ -227,7 +227,7 @@ EOF
       ((c++))
     done
     if [ -z "$name" ]; then
-      repo=$(basename "$(pwd)")
+      repo="$(basename "${PWD}")"
     fi
     case "$prev" in
       -d|-h)

lib/helpers.bash

@@ -449,7 +449,7 @@ _bash-it-restart() {
   _about 'restarts the shell in order to fully reload it'
   _group 'lib'
 
-  saved_pwd=$(pwd)
+  saved_pwd="${PWD}"
 
   case $OSTYPE in
     darwin*)

plugins/available/dirs.plugin.bash

@@ -23,7 +23,7 @@ alias 8="pushd +8"
 alias 9="pushd +9"
 
 # Clone this location
-alias pc="pushd \$(pwd)"
+alias pc='pushd "${PWD}"'
 
 # Push new location
 alias pu="pushd"
@@ -73,7 +73,7 @@ G () {
     example '$ G ..'
     group 'dirs'
 
-    cd "${1:-$(pwd)}" ;
+    cd "${1:-${PWD}}" ;
 }
 
 S () {

themes/powerturk/powerturk.theme.bash

@@ -43,7 +43,7 @@ _swd(){
     begin="" # The unshortened beginning of the path.
     shortbegin="" # The shortened beginning of the path.
     current="" # The section of the path we're currently working on.
-    end="${2:-$(pwd)}/" # The unmodified rest of the path.
+    end="${2:-${PWD}}/" # The unmodified rest of the path.
 
     if [[ "$end" =~ "$HOME" ]]; then
         INHOME=1