#!/usr/bin/env bash
#
# Refresh resources/svg/symbols from google/material-design-icons (Apache-2.0).
#
# Material Symbols Rounded at weight 400, grade 0 and optical size 24, outlined and
# filled, for every symbol Google publishes. Maintenance only: applications never run
# this, and bin/ is not part of the archive Composer installs.
#
# The repository is ~5 GB, so it is cloned without blobs and checked out sparsely:
# git downloads only the two files per symbol that are kept. The @material-symbols
# npm packages were not used because their SVGs are drawn at optical size 48, whose
# strokes are thinner than the 24px design.

set -euo pipefail

root="$(cd "$(dirname "$0")/.." && pwd)"
work="$(mktemp -d)"
trap 'rm -rf "$work"' EXIT

git clone --quiet --depth=1 --filter=blob:none --no-checkout \
    https://github.com/google/material-design-icons.git "$work/repo"

cd "$work/repo"

git sparse-checkout set --no-cone \
    '/symbols/web/*/materialsymbolsrounded/*_24px.svg' \
    '!/symbols/web/*/materialsymbolsrounded/*_wght[0-9]*' \
    '!/symbols/web/*/materialsymbolsrounded/*_grad200*' \
    '!/symbols/web/*/materialsymbolsrounded/*_gradN25*'

git checkout --quiet "$(git symbolic-ref --short HEAD)"

out="$root/resources/svg/symbols"
rm -rf "$out/outlined" "$out/filled"
mkdir -p "$out/outlined" "$out/filled"

# Google's files carry width="24" height="24" and no fill. Drop the size so CSS decides
# it, and paint in currentColor so an icon takes the colour of the text around it.
normalise() {
    sed -E \
        -e 's/ (width|height)="[0-9]+"//g' \
        -e 's/<svg /<svg fill="currentColor" /' \
        "$1"
}

missing=0

for dir in symbols/web/*/materialsymbolsrounded; do
    name="$(basename "$(dirname "$dir")")"
    outlined="$dir/${name}_24px.svg"
    filled="$dir/${name}_fill1_24px.svg"

    if [[ ! -f "$outlined" || ! -f "$filled" ]]; then
        echo "skipped $name: no outlined and filled 24px pair" >&2
        missing=$((missing + 1))
        continue
    fi

    normalise "$outlined" > "$out/outlined/$name.svg"
    normalise "$filled" > "$out/filled/$name.svg"
done

git rev-parse HEAD > "$out/SOURCE"

echo "$(ls "$out/outlined" | wc -l | tr -d ' ') symbols from google/material-design-icons@$(cut -c1-12 "$out/SOURCE"), $missing skipped"