Added the linux stuff - absolutely untested!

If someone has a time get trough, please report if it builds as it should be.

Author: lorol

.gitignore

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+dist/
+*.jar

.travis.yml

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+sudo: false
+
+language: java
+
+os:
+  - linux
+
+addons:
+  apt:
+    packages:
+    - ant
+
+jdk:
+  - oraclejdk8
+
+script:
+  - export SRC=$PWD
+  - cd $HOME
+  - export TAG=1.6.12
+  - wget https://github.com/arduino/Arduino/archive/$TAG.zip
+  - unzip $TAG.zip
+  - rm $TAG.zip
+  - export arduino_dir=Arduino-$TAG
+  - pushd $arduino_dir/build
+  - echo "" | ant build
+  - pushd shared/tools
+  - mkdir -p SP32LittleFS
+  - rsync -a $SRC/ SP32LittleFS/
+  - pushd SP32LittleFS
+  - ./make.sh
+  - popd && popd && popd

make.sh

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+#!/usr/bin/env bash
+
+if [[ -z "$INSTALLDIR" ]]; then
+    INSTALLDIR="$HOME/Documents/Arduino"
+fi
+echo "INSTALLDIR: $INSTALLDIR"
+
+pde_path=`find ../../../ -name pde.jar`
+core_path=`find ../../../ -name arduino-core.jar`
+lib_path=`find ../../../ -name commons-codec-1.7.jar`
+if [[ -z "$core_path" || -z "$pde_path" ]]; then
+    echo "Some java libraries have not been built yet (did you run ant build?)"
+    return 1
+fi
+echo "pde_path: $pde_path"
+echo "core_path: $core_path"
+echo "lib_path: $lib_path"
+
+set -e
+
+mkdir -p bin
+javac -target 1.8 -cp "$pde_path:$core_path:$lib_path" \
+      -d bin src/ESP32LittleFS.java
+
+pushd bin
+mkdir -p $INSTALLDIR/tools
+rm -rf $INSTALLDIR/tools/ESP32LittleFS
+mkdir -p $INSTALLDIR/tools/ESP32LittleFS/tool
+zip -r $INSTALLDIR/tools/ESP32LittleFS/tool/esp32littlefs.jar *
+popd
+
+dist=$PWD/dist
+rev=$(git describe --tags)
+mkdir -p $dist
+pushd $INSTALLDIR/tools
+zip -r $dist/ESP32LittleFS-$rev.zip ESP32LittleFS/
+popd