Patch up OPEN command in git scripts

buildroot/share/git/firstpush

 
 git push --set-upstream origin $BRANCH
 
-TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+which xdg-open >/dev/null && TOOL=xdg-open
+which gnome-open >/dev/null && TOOL=gnome-open
+which open >/dev/null && TOOL=open
 URL="https://github.com/$FORK/$REPO/commits/$BRANCH"
 
-if [ -z "$TOOL" ]; then
+if [ -z "$OPEN" ]; then
   echo "Can't find a tool to open the URL:"
   echo $URL
 else
   echo "Viewing commits on $BRANCH..."
-  "$TOOL" "$URL"
+  "$OPEN" "$URL"
 fi

buildroot/share/git/mfdoc

 [[ $ORG == "MarlinFirmware" && $REPO == "MarlinDocumentation" ]] || { echo "Wrong repository." 1>&2; exit 1; }
 
 opensite() {
-  TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+  which xdg-open >/dev/null && TOOL=xdg-open
+  which gnome-open >/dev/null && TOOL=gnome-open
+  which open >/dev/null && TOOL=open
   URL="http://127.0.0.1:4000/"
-  if [ -z "$TOOL" ]; then
+  if [ -z "$OPEN" ]; then
     echo "Can't find a tool to open the URL:"
     echo $URL
   else
     echo "Opening preview site in the browser..."
-    "$TOOL" "$URL"
+    "$OPEN" "$URL"
   fi
 }
 

buildroot/share/git/mfpr

 # See if it's been pushed yet
 if [ -z "$(git branch -vv | grep ^\* | grep \\[origin)" ]; then firstpush; fi
 
-TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+which xdg-open >/dev/null && TOOL=xdg-open
+which gnome-open >/dev/null && TOOL=gnome-open
+which open >/dev/null && TOOL=open
 URL="https://github.com/$ORG/$REPO/compare/$TARG...$FORK:$BRANCH?expand=1"
 
-if [ -z "$TOOL" ]; then
+if [ -z "$OPEN" ]; then
   echo "Can't find a tool to open the URL:"
   echo $URL
 else
   echo "Opening a New PR Form..."
-  "$TOOL" "$URL"
+  "$OPEN" "$URL"
 fi
 
 [[ $BRANCH != $OLDBRANCH ]] && git checkout $OLDBRANCH

buildroot/share/git/mfpub

     git push -f origin
   fi
 
-  TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+  which xdg-open >/dev/null && TOOL=xdg-open
+  which gnome-open >/dev/null && TOOL=gnome-open
+  which open >/dev/null && TOOL=open
   URL="https://github.com/$ORG/$REPO/compare/$TARG...$FORK:$BRANCH?expand=1"
 
-  if [ -z "$TOOL" ]; then
+  if [ -z "$OPEN" ]; then
     echo "Can't find a tool to open the URL:"
     echo $URL
   else
     echo "Opening a New PR Form..."
-    "$TOOL" "$URL"
+    "$OPEN" "$URL"
   fi
 
 fi
 rsync -av ${TMPFOLDER}/ ./
 
 opensite() {
-  TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+  which xdg-open >/dev/null && TOOL=xdg-open
+  which gnome-open >/dev/null && TOOL=gnome-open
+  which open >/dev/null && TOOL=open
   URL="http://marlinfw.org/"
-  if [ -z "$TOOL" ]; then
+  if [ -z "$OPEN" ]; then
     echo "Can't find a tool to open the URL:"
     echo $URL
   else
     echo "Opening the site in the browser..."
-    "$TOOL" "$URL"
+    "$OPEN" "$URL"
   fi
 }