Generate Static Resource to Image Assets Files for Flutter. See first comment for usage

genImageAssetsFlutter.sh

# Copyright 2018 Muhammad Iqbal(iqbalmineraltown.com)
# Permission is hereby granted, free of charge, to any person obtaining a copy 
# of this software and associated documentation files (the "Software"), to deal 
# in the Software without restriction, including without limitation the rights 
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
# copies of the Software, and to permit persons to whom the Software is 
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
# THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#!/bin/bash

targetfolder="./lib/assets"
targetfile="$targetfolder/assets.dart"
regex='s/[-_]([a-z0-9])/\U\1/gi'

# for OSX, replace sed with command below
# perl -nE 'say lcfirst join "", map {ucfirst lc} split /[^[:alnum:]]+/'

echo `pwd`
cd `pwd`

mkdir -p ./lib/assets
touch $targetfile

touch tmp
echo "class ImageAssets {" > $targetfile
for f in `find ./assets/images -maxdepth 1 -type f`; do 
  filename=`echo $f | cut -d'/' -f4 | cut -d'.' -f1`
  varname=`echo $filename | sed -E $regex`
  entry="static const String $varname = '${f:2}';"
  echo "     $entry" >> tmp;
done;
sort tmp >> $targetfile
printf '}\n\n' >> $targetfile
rm -f tmp

cd -

Pre-requisites

• filename in snake_case or kebab-case
• Tested on Linux Ubuntu
• Tested on MacOSX with gnu-sed installed

How To

Run this on the root of Flutter Project. It will generate assets.dart under lib/assets folder