fetch dependencies on package change during rebuild; cleanup, docs

Author: zachgrayio

Package.resolved

@@ -34,6 +34,7 @@ Projects built with this template will have the following traits:
 2. Quick and easy [REPL](https://github.com/tensorflow/swift/blob/master/Usage.md#repl-read-eval-print-loop) access against the project's Swift for Tensorflow code and third-party libraries
 3. Easily unit testable
 4. Runs anywhere Docker is available with no additional setup necessary - zero conflicts with existing Swift or TensorFlow installations.
+5. Swift code is hot-reloaded on change; third-party libraries are downloaded automatically as well. See the `--live` flag.
 
 This will enable both ease of use during the research phase and a rapid transition to a scalable training solution and beyond (production deployment).
 
@@ -140,6 +141,7 @@ A control script is included for extra convenience for users on macOS/Linux, but
 
 Some example commands:
 
+* `./sts run app --live` - automatically rebuild and run the application on code change; packages are updated automatically as well!
 * `./sts build --release`,  `./sts build -r`,   `./sts build -p`,   `./sts build --prod` - build the image with a release executable
 * `./sts run repl --build --name myrepl -v` - run a REPL in a container named myrepl, mounting the current directory as a volume, building the project first
 * `./sts run test`,  `./sts run tests --name testcontainer` - run unit tests

README.md

@@ -12,46 +12,49 @@ build() {
     swift build --configuration ${CONFIG}
 }
 
-installApplication() {
+install_application() {
     cp ./.build/${CONFIG}/libSTSLibrary.so /usr/lib/libSTSLibrary.so
     cp ./.build/${CONFIG}/STSLibrary.swiftmodule /usr/lib/STSLibrary.swiftmodule
     cp ./.build/${CONFIG}/STSApplication /usr/bin/STSApplication
 }
 
-runApplication() {
+run_application() {
     /usr/bin/STSApplication
 }
 
-buildAndRun() {
-    build && installApplication && runApplication
+build_and_run() {
+    build && install_application && run_application
 }
 
-detectChangesLoop() {
-    while [[ "$KILL" != true ]]
+watch_files() {
+    while [ ${KILL} != true ]
     do
-        files=`find Sources* -type f -newer /usr/bin/STSApplication`
+        files=`find *.swift -type f -newer /usr/bin/STSApplication`
         if [[ ${files} != "" ]] ; then
             echo "Changes in files: $files, building..."
-            buildAndRun
+            if [[ ${files} = *"Package.swift" ]] ; then
+                swift package update
+            fi
+            build_and_run
             echo "Waiting for changes to run application again."
         fi
         sleep 2
     done
 }
 
 entrypoint() {
-    buildAndRun
+    build_and_run
 }
 
-liveEntrypoint() {
-    buildAndRun
+live_entrypoint() {
+    build_and_run
     echo "Waiting for changes to run application again."
-    detectChangesLoop &
+    watch_files &
     wait
 }
 
-if [ "$LIVE" = true ] ; then
-    liveEntrypoint
+if [ ${LIVE} = true ] ; then
+    live_entrypoint
 else
     entrypoint
 fi

entrypoint

@@ -10,7 +10,7 @@ TXT_GREEN='\033[0;32m'
 TXT_YELLOW='\033[0;33m'
 TXT_RED='\033[0;31m'
 
-while [[ $# -gt 0 ]]
+while [ $# -gt 0 ]
 do
     key="$1"
     case ${key} in