update-lib-www

#!/bin/bash -e

www=lib/wifi_setup/www
material=../material-wifi-setup

function fail {
    echo "Error: $1" 1>&2
    exit 1
}

# Check that material-wifi-setup been checked out and that @angular/cli been installed.
[ -d $material ] || fail "expected to find material-wifi-setup checked out in $material"
hash ng 2>/dev/null || fail '@angular/cli is not installed'

# Make sure we don't destroy any local changes.
[[ -z $(git status --short -- $www) ]] || fail "$www contains uncommitted changes"

cd $material

# Rebuild the distribution.
rm -rf dist
ng build --prod

cd - > /dev/null

# Move over the rebuilt distribution.
git rm -q -r $www
mv $material/dist/wifi-setup $www

before=( $(du -hs $www) )

# Search for files that are at least 1KiB.
for file in $(find $www -type f -size +1k)
do
    # Without `--no-name`, gzip includes a timestamp meaning zipping the
    # same file time twice results in results that look different to git.
    gzip --best --no-name $file

    # If the gzip makes little difference undo the compression.
    pct=$(gzip --list $file | sed -n 's/.*\s\([0-9.-]\+\)%\s.*/\1/p')
    if (( $(echo "$pct < 5" | bc -l ) ))
    then
        gunzip $file
    fi
done

after=( $(du -hs $www) )

echo "Info: reduced size of www from ${before[0]} to ${after[0]}"

git add $www
echo "Info: any changes are now ready to be committed"