move build script back to bash

bin/build

-#! /usr/bin/perl
-
-use strict;
-use warnings;
-
-use Env qw($CI);
-
-sub version {
-    return if $CI;
+#!/usr/bin/env bash
+
+# Generate the resources/version.properties file
+version() {
+    # Skip on CircleCI since this is interactive
+    if [ ! $CI ]; then
+        VERSION_INFO=$(./bin/version)
+        IFS=', ' read -a info <<< ${VERSION_INFO}
+
+        echo "Tagging uberjar with version '$VERSION_INFO'..."
+
+        # Ok, now generate the appropriate version.properties file.
+        echo "tag=${info[0]}" > resources/version.properties
+        echo "hash=${info[1]}" >> resources/version.properties
+        echo "branch=${info[2]}" >> resources/version.properties
+        echo "date=${info[3]}" >> resources/version.properties
+    fi
+}
 
-    my ($tag, $hash, $branch, $date) = split ' ', (`./bin/version` or die $!);
+frontend() {
+    echo "Running 'npm install' to download javascript dependencies..." &&
+    npm install &&
 
-    open my $file, '>resources/version.properties' or die $!;
-    print $file ("tag=$tag\n" .
-                 "hash=$hash\n" .
-                 "branch=$branch\n" .
-                 "date=$date\n");
-    close $file;
+    echo "Running 'webpack -p' to assemble and minify frontend assets..." &&
+    ./node_modules/webpack/bin/webpack.js -p
 }
 
-sub frontend {
-    system('npm', 'install') == 0 or die $!;
-    system('./node_modules/webpack/bin/webpack.js', '-p') == 0 or die $!;
+sample-dataset() {
+    if [ -f resources/sample-dataset.db.mv.db ]; then
+        echo "Sample Dataset already generated."
+    else
+        echo "Running 'lein generate-sample-dataset' to generate the sample dataset..."
+        lein generate-sample-dataset
+    fi
 }
 
-sub sample_dataset {
-    (system('lein', 'generate-sample-dataset') == 0 or die $!) unless -f 'resources/sample-dataset.db.mv.db';
+uberjar() {
+    echo "Running 'lein uberjar'..."
+    lein uberjar
 }
 
-sub uberjar {
-    system('lein', 'uberjar') == 0 or die $!;
+all() {
+    version && frontend && sample-dataset && uberjar
 }
 
-@ARGV = ('version', 'frontend', 'sample_dataset', 'uberjar') unless @ARGV;
-map { eval $_ } @ARGV;
+# Default to running all but let someone specify one or more sub-tasks to run instead if desired
+# e.g.
+# ./bin/build                  # do everything
+# ./bin/build version          # just update version.properties
+# ./bin/build version uberjar  # just update version.properties and build uberjar
+if [ "$1" ]; then
+    for cmd in "$@"; do
+        $cmd
+    done
+else
+    all
+fi