linux_dart_update

#!/bin/bash

# ~ doesn't work in string resolution use /home/$USER/ instead
DOWNLOAD_DIR="/home/$USER/Downloads/Dart"
CURRENT_VERSION_FILE="VERSION_current"
NEW_VERSION_FILE="VERSION_new"
#DOWNLOAD_VERSION_FILE="VERSION_download"
#VERSION_URL="http://gsdview.appspot.com/dart-archive/channels/dev/release/latest/VERSION"
VERSION_URL="http://gsdview.appspot.com/dart-archive/channels/be/raw/latest/VERSION"
#EDITOR_LINUX64_URL="http://gsdview.appspot.com/dart-archive/channels/dev/release/latest/editor/darteditor-linux-x64.zip"
EDITOR_LINUX64_URL="http://gsdview.appspot.com/dart-archive/channels/be/raw/latest/editor/darteditor-linux-x64.zip"
VERSION_REGEX=" *\"revision\" *: \"([0-9]*)"
DARTEDITOR_DEST_DIR="/home/$USER/google/darteditor"
DARTEDITOR_BACKUP_DIR="${DARTEDITOR_DEST_DIR}_old"
cd $DOWNLOAD_DIR


# Download VERSION file
# -N: overwrite existing file
# -O: specify destination file
wget -q -O $NEW_VERSION_FILE $VERSION_URL

# read new version number from file
if [ ! -f "$NEW_VERSION_FILE" ]; then
        echo "Download VERSION file failed."
        exit
else
        # read file content into a variable 
        newVersionContent=$(cat $NEW_VERSION_FILE)

        # regex matching in bash
        [[ "$newVersionContent" =~ $VERSION_REGEX ]]
        newVersion="${BASH_REMATCH[1]}"
fi

# read version from previous downloaded version file 
# check if file NOT exists
if [ ! -f "$CURRENT_VERSION_FILE" ]; then
        curVersion=0
else
        curVersionContent=$(cat $CURRENT_VERSION_FILE)
        [[ "$curVersionContent" =~ $VERSION_REGEX ]]
        curVersion="${BASH_REMATCH[1]}"
fi

destFileName="darteditor-linux-64 ${newVersion}.zip"

#echo new: $newVersion
#echo cur: $curVersion

# compore current and new version
# (( )) for integer expression evaluation instead of string evaluation with [[]]
if (( $newVersion > $curVersion )); then
        echo "Newer version available"
        echo "Downloading version $newVersion."

# download new editor version
        if [ ! -f "$destFileName" ]; then
                wget -O "$destFileName" "$EDITOR_LINUX64_URL"
        else
                echo "$destFileName" already exists.
        fi
fi

if (( $newVersion > $curVersion )) || [ ! -d "$DARTEDITOR_DEST_DIR" ]; then

# delete old backup directory
        if [ -d "$DARTEDITOR_BACKUP_DIR" ]; then
                rm -r "${DARTEDITOR_DEST_DIR}_old"
                #echo "deleting: ${DARTEDITOR_DEST}_old"
        fi

# move current files to backup directory
        #echo "$DARTEDITOR_DEST_DIR  $DARTEDITOR_BACKUP_DIR"
        mv "$DARTEDITOR_DEST_DIR" "$DARTEDITOR_BACKUP_DIR"

#extract ladownloaded file
        mkdir "$DARTEDITOR_DEST_DIR"
        unzip "$destFileName" -d "$DARTEDITOR_DEST_DIR"

        ## remove the unnecessary dart subfolder created from the archive file

        ## mv "${DARTEDITOR_DEST_DIR}/dart/*" "$DARTEDITOR_DEST_DIR" #
        ## hat nicht funktioniert wegen Anführungszeichen - die sind
        ## aber notwendig wenn der Pfad Leerzeichen enthält
        ## daher nachfolgende Lösung.
        if [ -d "${DARTEDITOR_DEST_DIR}/dart" ]; then
                ls -A -1 "${DARTEDITOR_DEST_DIR}/dart" | while read FILE; do mv -v "${DARTEDITOR_DEST_DIR}/dart/${FILE}" "${DARTEDITOR_DEST_DIR}" ;done
        fi

        #echo "-Dorg.eclipse.swt.browser.DefaultType=mozilla" >> "${DARTEDITOR_DEST_DIR}/DartEditor.ini"

# replace current version file with the new     one
        if [ -f "$CURRENT_VERSION_FILE" ]; then
                rm $CURRENT_VERSION_FILE
        fi
        mv "$NEW_VERSION_FILE" "$CURRENT_VERSION_FILE"

# download content_shell
        cd "$DOWNLOAD_DIR"
#       mv content_shell-linux-x64-release.* "content_shell-linux-x64-release${curVersion}.zip"
        /bin/bash "${DARTEDITOR_DEST_DIR}/chromium/download_contentshell.sh"
        unzip "${DOWNLOAD_DIR}/content_shell-linux-x64-release.zip" -d "${DARTEDITOR_DEST_DIR}/chromium/"
        csDir=$(find ${DARTEDITOR_DEST_DIR}/chromium/ -name drt-lucid64-full-*)
        ln -s "${csDir}" "${DARTEDITOR_DEST_DIR}/chromium/content_shell"
fi

echo "current version: $curVersion"
echo "new version    : $newVersion"