New build mechanism

frontend/.gitignore

@@ -10,3 +10,4 @@ repl-temp-*
 
 # End of https://www.gitignore.io/api/elm
 index.html
+output

frontend/build.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env sh
+
+js="gitcdn.js"
+min="gitcdn.min.js"
+outdir="./output/"
+scriptdir="${outdir}scripts/"
+
+prepare() {
+  mkdir -p "${outdir}/scripts"
+}
+
+build() {
+  elm make --optimize src/Main.elm --output=${js}
+}
+
+minify() {
+  uglifyjs ${js} --compress 'pure_funcs="F2,F3,F4,F5,F6,F7,F8,F9,A2,A3,A4,A5,A6,A7,A8,A9",pure_getters,keep_fargs=false,unsafe_comps,unsafe' | uglifyjs --mangle --output=${min}
+}
+
+sha1() {
+  sha1sum ${min} | cut -d' ' -f 1
+}
+
+rename_with_hash() {
+  sha1=${1}
+  cp ${min} "${scriptdir}/gitcdn-${sha1}.min.js"
+}
+
+create_index() {
+  sha1=${1}
+  SHA1="${sha1}" envsubst < index.html > "${outdir}/index.html"
+}
+
+prepare
+build
+minify
+sha1=$(sha1)
+rename_with_hash "${sha1}"
+create_index "${sha1}"